JP4542364B2 - Pipe connection structure and installation method of in-pipe work machine to insertion tube - Google Patents

Description

  The present invention relates to a pipe connection structure for attaching an in-pipe working machine such as a drilling machine that can be fed into the insertion tube part through the inside thereof, and a method for attaching the in-pipe work machine to the insertion tube part using the pipe connection structure.

  In the conventional pipe connection structure, the inside of the pipe that can be fed into the other end of the joint pipe provided on one end side with the fitting pipe that is externally fitted to the insertion pipe from the pipe axis direction. A connecting flange part for flange joining to a drilling machine, which is an example of a working machine, is formed, and an annular groove formed on an inner peripheral surface of a fitting pipe part of a joint pipe has an outer periphery of an insertion pipe part. In addition, elastic sealing material that seals the gap between the surfaces is mounted, and in addition, at multiple locations in the circumferential direction that are displaced to the other end of the fitting tube portion of the joint tube, the outer circumferential surface of the inlet tube portion is pressed from the radial direction. The fixing bolt is screwed.

  In addition, the other end of the fitting tube portion of the joint tube is engaged with the rotation restricting protrusions formed at a plurality of locations in the circumferential direction of the proximal end portion of the insertion tube portion from the tube axis direction. A recess is formed, and one end side of the inner peripheral surface of the fitting tube portion is connected to a lock ring held on the inner peripheral surface of the receiving tube portion from the tube axis direction. An annular fitting guide surface that contacts the outer surface of the retaining protrusion formed integrally with the distal end of the outer peripheral surface of the insertion tube portion is formed in order to prevent the separation movement between the insertion tube portion and the reception tube portion. Further, the retaining projection of the insertion tube portion is formed with a tapered surface for elastically deforming the elastic seal material attached to the lock ring or the joint tube toward the diameter-expanding side as the insertion projection is moved. (See Patent Document 1).

  Then, when attaching the drilling machine to the insertion tube portion, first, the fitting tube portion of the joint tube in which the elastic seal material is attached to the annular groove is externally fitted to the insertion tube portion from the tube axis direction. In the middle of the outer fitting, the elastic sealing material is elastically deformed to the enlarged diameter side, and the retaining projection of the insertion tube portion is moved through, and when the fitting is finished, the engagement concave portion of the other end portion of the fitting tube portion is formed. The fitting guide surface formed on one end side of the inner peripheral surface of the fitting tube portion is engaged with the rotation restricting protrusion on the base end portion side of the fitting tube portion, and is removed from the retaining protrusion of the insertion tube portion. Touch the side. After that, a plurality of fixing bolts are screwed to the tightening side to fix and connect the insertion tube portion and the fitting tube portion of the joint tube, and then connect the connecting flange portion of the drilling machine to the connection flange portion of the joint tube. It is fixedly connected in a sealed state via bolts and nuts.

JP 2000-28059 A

  In the conventional pipe connection structure, the joint pipe is prevented from moving out in the direction of the pipe axis relative to the insertion pipe part by tightening a plurality of fixing bolts screwed into the fitting pipe part of the joint pipe. Therefore, it is necessary to tighten all the fixing bolts strongly without loosening. Moreover, when removing the joint pipe from the insertion tube part after drilling, the elastic sealing material attached to the annular groove on the inner peripheral surface of the fitting tube part is caught by the retaining protrusion of the insertion tube part. There was a problem that required a lot of labor and labor for the work.

  The present invention has been made in view of the above-described actual situation, and the main problem thereof is a configuration provided on the inlet tube portion side in order to connect the inlet tube portion and the inlet tube portion. Utilizing the pipe connection structure that can securely and securely hold and fix the joint pipe for detachably connecting the in-pipe work machine to the insertion pipe part, and the in-pipe work machine to the insertion pipe part It is in providing an installation method.

In the present invention, the outer peripheral surface of the inserted pipe section is inserted into and connected from the tube axis direction to the receiver pipe portion, with a tube connecting butt raised portion that protrudes is formed radially outward, inserted pipe At the other end of the joint pipe provided with a fitting pipe part fitted from the pipe axis direction to the pipe part, there is a connecting flange part for flange joining with an in-pipe work machine that can be fed through the insertion pipe part. In addition, the fitting tube portion of the joint tube has an end portion on the side farther from the distal end of the insertion port in the tube axis direction, out of both ends in the tube axis direction of the tube connection projection of the insertion tube portion. Fixing means may be provided for fixing the joint pipe and the insertion tube portion by relatively pulling and moving by a tightening operation in the engaged state .

According to the above configuration , when connecting the in-pipe work machine capable of being fed into the insertion tube part through the inside thereof, the connection pipe part for connecting the flange with the in-pipe work machine is provided for the insertion tube part. The fitting tube portion of the joint tube is fitted from the tube axis direction, and the fixing means provided on the fitting tube portion is engaged with one end portion of the tube connection projection portion of the insertion tube portion. By tightening operation, the joint pipe and the insertion tube part can be relatively pulled and fixed along the tube axis direction, so that the insertion tube part and the joint pipe can be moved in the detaching direction. Even if an external force is applied, this external force can be reliably received by the engaging portion between the one end of the pipe connecting projection and the fixing means.

  Therefore, using a sturdy tube connecting projection formed on the outer peripheral surface of the insertion tube portion, a fitting tube for detachably connecting the in-pipe work machine is externally fitted to the insertion tube portion. In this state, it is possible to securely and firmly hold and fix, and it is possible to reduce the operation force required for the holding and fixing.

In the present invention , the fixing means includes a rotation restricting means for preventing relative rotation between the insertion tube portion and the joint tube by engaging the tube connection projection of the insertion tube portion from the circumferential direction. It may be provided .

According to the said structure , the fitting pipe part of the joint pipe provided with the connection flange part for flange joining with an in-pipe work machine is externally fitted from the pipe-axis direction with respect to the insertion pipe part, This fitting pipe The fitting means is tightened in a state where the fixing means is engaged with one end of the tube connection projection of the insertion tube portion, and the joint tube and the insertion tube portion are relatively pulled and fixed. At the same time, the rotation restricting means provided on the fixing means is engaged with the tube connecting projection of the inlet tube portion from the circumferential direction, so that the inlet tube portion and the joint tube are detached and rotated. Even if an external force in the direction acts, the external force can be reliably received by the engaging portion between the one end portion of the pipe connecting projection and the fixing means.

  Therefore, using the robust tube connection projections that are formed to protrude from the outer peripheral surface of the insertion tube portion, the joint tube and the insertion tube portion that are externally connected and connected are securely and firmly secured and secured. Can be fixed.

In the present invention, at the other end portion of the joint pipe, a contact portion that can be brought into contact with the distal end of the insertion tube portion from the tube axis direction is formed, and between the contact portion and the distal end of the insertion tube portion, In addition, a sealing material that is pinched as the relative pulling movement between the joint tube and the insertion tube portion by the fastening operation of the fixing means may be interposed .

According to the above configuration , by inserting and fitting the joint tube into the insertion tube portion until the contact portion formed at the other end portion of the joint tube contacts the tip of the insertion tube portion, the insertion tube The joint pipe can be attached to the part in a predetermined fitting posture. In addition, the sealing material interposed between the contact portion and the distal end of the insertion tube portion is clamped in a sealed state as the joint tube and the insertion tube portion are relatively drawn by the fastening operation of the fixing means. Therefore, when the joint pipe is removed from the insertion pipe section, the sealing material does not become the pull-out resistance of the joint pipe, or the pull-out resistance becomes small, and the joint pipe can be disassembled efficiently and easily.

In the present invention, at the other end of the joint pipe, a contact portion that can contact the tip of the insertion tube portion from the tube axis direction is formed, and this contact portion is formed on the inner peripheral surface of the insertion tube portion. A centering guide portion that aligns the shaft core of the joint tube with the shaft core of the insertion tube portion may be formed by fitting from the tube shaft core direction in a sliding contact state .

According to the above configuration , by inserting and fitting the joint tube into the insertion tube portion until the contact portion formed at the other end portion of the joint tube contacts the tip of the insertion tube portion, the insertion tube The joint pipe can be attached to the part in a predetermined fitting posture. In addition, since the centering guide portion formed at the contact portion is fitted from the tube axis direction in a state of sliding contact with the inner peripheral surface of the insertion tube portion, the axis of the joint tube is the axis of the insertion tube portion. Therefore, the in-pipe work machine can be fed accurately without sliding contact with the inner wall surface of the insertion tube portion. In particular, when the in-pipe work machine is a drilling machine, damage due to cutting of the inner wall surface of the insertion tube part can be avoided.

In the present invention , the fixing means includes a connecting flange portion formed at one end portion of the joint pipe, a pressing member that can be engaged with one end portion of the pipe connecting projection portion from the tube axis direction, and both of them are connected to the tube shaft. You may be comprised from the screw-type fixing tool fastened and fixed, making it relatively draw and move along a core direction .

According to the above configuration , the screw-type fixing tool of the fixing means is operated to engage the coupling flange portion of the joint pipe that is externally fitted to the insertion tube portion and the one end portion of the pipe connection projection portion from the tube axis direction. Even if an external force in the disengagement direction acts on the insertion tube portion and the joint tube by relatively pulling and fixing the pressed holding member, the external force is applied to the one end portion of the tube connecting projection and the holding member. Can be reliably received by the engaging portion.

In the present invention , the tube connecting projection of the insertion tube portion abuts against the lock ring held on the inner peripheral surface of the receiving tube portion from the tube axis direction to prevent the detachment movement of both tube portions. You may be comprised from the securing protrusion .

According to the above configuration , in order to prevent detachment movement between the receiving tube portion and the insertion tube portion, the lock ring held on the inner peripheral surface of the receiving tube portion can be contacted from the tube axis direction. Since the retaining protrusion formed integrally with the inlet tube part is used, the joint pipe for detachably connecting the in-pipe work machine can be securely and firmly secured to the inlet tube part in an externally fitted state. can do.

According to the present invention , the tube connection protrusion of the insertion tube portion is brought into contact with the bending prevention ring that is elastically deformable to the reduced diameter side held on the inner peripheral surface of the reception tube portion. the parts and the socket pipe portion may be composed of preventing collision force bent to maintain the coaxially state.

According to the above configuration , in order to prevent bending of the receiving tube portion and the insertion tube portion, the bending preventing ring that is elastically deformable on the reduced diameter side held on the inner peripheral surface of the receiving tube portion is brought into contact. since state utilizing a bending preventing collision force which is integrally formed on the inserted pipe section, the certainty with fitted state joint pipe for detachably connecting the pipe work machine with respect to inserted pipe section, strong It can be fixed and secured.

In the present invention, the inserted pipe section having a pipe connecting butt raised portion projecting radially outwardly, externally fitted to the fitting tube portion of the joint pipe in a sealed state from the pipe axis direction, and the externally fitted The fixing means provided in the joint pipe is engaged with one end portion on the side farther from the distal end of the insertion port in the tube axis direction among the both ends in the tube axis direction of the tube connection projection of the insertion tube portion. By tightening in the state, the joint tube and the inlet tube portion are relatively moved and fixed in the direction of the tube axis and fixed to the connecting flange portion formed on the other end side of the joint tube. The mounting flange part of the in-pipe working machine that can be fed through the part may be fixedly connected in a sealed state .

According to the above configuration , when connecting the in-pipe work machine capable of being fed into the insertion tube part through the inside thereof, the connection pipe part for connecting the flange with the in-pipe work machine is provided for the insertion tube part. The fitting tube portion of the joint tube is fitted from the tube axis direction, and the fixing means provided on the fitting tube portion is engaged with one end portion of the tube connection projection portion of the insertion tube portion. By tightening operation, the joint pipe and the insertion tube part can be relatively pulled and fixed along the tube axis direction, so that the insertion tube part and the joint pipe can be moved in the detaching direction. Even if an external force is applied, this external force can be reliably received by the engaging portion between the one end of the pipe connecting projection and the fixing means.

  In this state, the mounting flange part of the in-pipe work machine that can be fed through the insertion pipe part is fixedly connected in a sealed state to the connection flange part formed on the other end side of the joint pipe in this state, so that the in-pipe work can be performed through the insertion pipe part. The machine can be reliably fed to the in-pipe work position, and the in-pipe work machine can be maintained at the in-pipe work position against the work reaction force.

  Therefore, using a sturdy tube connecting projection formed on the outer peripheral surface of the insertion tube portion, a fitting tube for detachably connecting the in-pipe work machine is externally fitted to the insertion tube portion. In this state, it is possible to securely and firmly hold and fix, and it is possible to reduce the operating force required for the locking and fixing, and to ensure the work in the pipe by the pipe working machine.

In the present invention , a contact portion that comes into contact with the distal end of the insertion tube portion from the tube axis direction is integrally formed with the connection flange portion of the joint pipe, and the contact portion of the connection flange portion and the insertion tube portion The sealing material is disposed in the annular space surrounded by the annular inclined surface formed on the outer peripheral surface front end side and the inner peripheral surface of the joint pipe, and the joint pipe and the insertion pipe portion are relatively attracted and fixed. At this time, the gap between the outer peripheral surface of the insertion tube portion and the inner peripheral surface of the joint tube may be sealed with a sealing material .

According to the above configuration , by inserting and fitting the joint tube into the insertion tube portion until the contact portion formed on the coupling flange portion of the joint tube contacts the tip of the insertion tube portion, the insertion tube The joint pipe can be attached to the part in a predetermined fitting posture. Moreover, the sealing material disposed in the annular space surrounded by the annular inclined surface formed on the front end side of the outer peripheral surface of the contact portion and the insertion tube portion and the inner peripheral surface of the joint tube is formed by the tightening operation of the fixing means. As the fitting tube and the insertion tube part are clamped in a sealed state along with the relative pulling movement of the fitting tube, the seal material can become the pull-out resistance of the fitting tube when removing the fitting tube from the insertion tube part. No pulling resistance is reduced, and the joint pipe can be disassembled efficiently and easily.
The first characteristic configuration of the pipe connection structure according to the present invention is:
On the outer peripheral surface of the insertion tube portion that is inserted and connected to the receiving tube portion from the tube axis direction, a pipe connecting projection portion that protrudes radially outward is formed, and the receiving tube is used as the tube connection protrusion portion. A retaining projection provided at the distal end of the insertion tube portion that contacts the lock ring held on the inner peripheral surface of the tube portion from the tube axis direction to prevent the separation movement of both tube portions; Providing a fitting depth regulating projection that comes into contact with the outer end surface from the tube axis direction,
To the other end of the joint pipe provided with a fitting pipe part fitted from the pipe axis direction with a sealant interposed between the insertion pipe part and the outer peripheral surface of the insertion pipe part Is formed with a connecting flange portion for flange connection with an in-pipe work machine that can be fed through the insertion tube portion, and the contact flange portion can contact the tip of the insertion tube portion from the tube axis direction. Is a pipe connection structure formed,
One end of the joint pipe is connected to the tube shaft at one end of the insertion tube portion of the insertion tube portion, or the fitting depth regulating projection, on the side away from the insertion port tip in the tube axis direction. A fixing means for fixing the joint tube and the insertion tube portion by relatively drawing and moving in the tube axis direction by a tightening operation in a state where the presser member that can be engaged from the core direction is engaged is provided,
A contact portion of the connecting flange portion formed at the other end portion of the joint pipe, an annular inclined surface formed at the distal end side of the outer peripheral surface of the retaining projection of the insertion tube portion, and an inner peripheral surface of the fitting pipe portion of the joint pipe The sealing material is arranged in an annular space surrounded by a ring, and the sealing material is clamped as the joint pipe and the insertion tube part are relatively pulled by the fastening operation of the fixing means, and the outer periphery of the insertion tube part It is in the point which seals between the surface and the inner peripheral surface of the fitting pipe part of the joint pipe.
The second characteristic configuration of the pipe connection structure according to the present invention is:
The fixing means is provided with a rotation restricting means for preventing relative rotation between the insertion tube portion and the joint tube by engaging the tube connection projection of the insertion tube portion from the circumferential direction. In the point.
The third characteristic configuration of the pipe connection structure according to the present invention is:
In the contact portion formed at the other end portion of the joint pipe, the shaft center of the joint pipe is inserted into the insertion tube portion by being fitted from the tube axis direction in a state of sliding contact with the inner peripheral surface of the insertion tube portion. The centering guide portion is formed so as to be aligned with the shaft core.
The fourth characteristic configuration of the pipe connection structure according to the present invention is:
The fixing means is formed at the other end portion of the joint pipe by tightening the connecting flange portion formed at one end portion of the joint pipe, the presser member, and moving both of them relatively along the pipe axis direction. It is in the point comprised from the screw-type fixing tool fixed in the state which the contact part of the made connection flange part and the front-end | tip of an insertion tube part contact | abutted in the pipe-axis core direction.
The fifth characteristic configuration of the pipe connection structure according to the present invention is:
For bending prevention that maintains the insertion tube portion and the receiving tube portion in a coaxial core state by contact with a bending prevention ring that is elastically deformable on the reduced diameter side held on the inner peripheral surface of the receiving tube portion The protrusions are provided so as to protrude radially outward on the outer peripheral surface of the insertion tube portion.
The first characteristic configuration of the method of attaching the in-pipe work machine to the insertion tube portion according to the present invention is
As the tube connection projection projecting radially outward, the tube insertion tube portion that comes into contact with the lock ring held on the inner peripheral surface of the receiving tube portion from the tube axis direction and prevents the detachment movement of both tube portions. The fitting tube is fitted into the insertion tube portion having a retaining projection provided at the tip of the tube and a fitting depth regulating projection that contacts the outer end surface of the receiving tube portion from the tube axis direction. The pipe part is externally fitted in a sealed state with a sealing material interposed between the outer peripheral surface of the insertion pipe part and the inner peripheral surface of the fitting pipe part from the pipe axis direction. A mounting method for an in-pipe working machine to an insertion tube part in which a connecting flange part of an in-pipe working machine that can be fed through the insertion tube part is fixedly connected in a sealed state to a connecting flange part formed at an end part,
Fixing means provided at one end of the joint pipe fitted to the insertion tube portion is inserted into the insertion tube portion at both ends in the tube axis direction of the retaining protrusion of the insertion tube portion or the fitting depth regulating projection. Tighten with the presser member that can be engaged from the tube axis direction to one end that is away from the tip in the tube axis direction. The outer peripheral surface tip of the stopper projection of the insertion tube portion and the contact portion formed on the connecting flange portion of the other end portion of the joint pipe and abutting from the tube axis direction on the distal end of the insertion tube portion. The sealing material disposed in the annular space surrounded by the annular inclined surface formed on the side and the inner peripheral surface of the fitting tube portion of the joint tube, and the joint tube and the inlet tube portion by tightening operation of the fixing means As the relative pulling movement of the fitting tube is performed, the gap between the outer peripheral surface of the inlet tube portion and the inner peripheral surface of the fitting tube fitting portion is sealed. It lies in mounting the pipe work machine connecting flange portion on an end portion.

[First Embodiment]
1 to 5 show a pipe connection structure in the middle of a fluid transportation path, and a cast iron joint body A attached to a fluid pipe 1 such as a cast iron water pipe or the like is in a pipe circumferential direction in a sheath state on the fluid pipe 1. It is composed of two split joint bodies A1 and A2 that are detachably fixedly connected along the (circumferential direction), and one of the split joint bodies A1 is fluidized by a drilling machine C that is an example of an in-pipe working machine. A branch receiving pipe portion 3 communicating in a concentric state with respect to the through hole 2 formed in the peripheral wall of the pipe 1 from the second pipe axis Y direction perpendicular to the first pipe axis X direction of the fluid pipe 1. Is formed so as to integrally project outward, and the upstream side of the gate valve B provided with a valve body 4 for opening and closing the branch flow path W in the branch receiving pipe portion 3 of the split joint body A1. The insertion tube portion 5 is fitted and connected in a sealed state so as to be bent in a three-dimensional direction.

  Further, when the through hole 2 formed in the peripheral wall of the fluid pipe 1 is changed to a large diameter, or when a new through hole 2 is formed in the peripheral wall of the fluid pipe 1, as shown in FIG. In addition, a fitting pipe 7 provided with a connecting flange part 7A is externally fixed in a sealed state to the insertion pipe part 6 formed on the downstream side of the gate valve B, and the connecting flange part 7A of the fitting pipe 7 is The connecting flange portion 8A formed on the upstream side of the casing 8 of the drilling machine C is fixedly connected in a sealed state via bolts 9 and nuts 10.

  When the drilling operation by the drilling machine C is completed, the drilling machine C is removed from the connecting flange portion 7A of the joint pipe 7 and the downstream side inlet pipe portion 6 of the gate valve B as shown in FIG. Then, the joint pipe 7 is removed, and the receiving pipe section 11 of the branch piping system is fitted and connected to the downstream insertion pipe section 6 of the gate valve B in a sealed state.

  Each of the split joint bodies A1 and A2 has a connecting flange portion 15 for fixing and connecting adjacent ones in the pipe circumferential direction via bolts 13 and nuts 14 at both ends in the pipe circumferential direction. In the first tube axis X direction both ends of each split joint body A1, A2 and each of the two places spaced apart in the pipe circumferential direction, Bolts 16 for holding a gap between the inner peripheral surface of each split joint body A1, A2 and the outer peripheral surface of the fluid pipe 1 are screwed together, and further formed on each of the split joint bodies A1, A2. In the seal groove, in order to prevent leakage of fluid (tap water) from the through hole 2 to the outside, between the outer peripheral surface of the fluid pipe 1 and the split joint bodies A1 and A2 adjacent in the pipe circumferential direction. A first elastic sealing material 17 made of synthetic rubber for sealing each of the connecting flange portions 15 is provided. It has been if held.

Next, a pipe connection structure between the branch receiving pipe part 3 of the split joint body A1 and the upstream insertion pipe part 5 of the gate valve B will be described.
As shown in FIG. 1, the front half side portion 5A of the upstream inlet tube portion 5 of the gate valve B is formed in a partially spherical shape outward in the diameter direction, and is formed on the outer peripheral surface of the partial spherical portion 5A. Is formed with a partially spherical second slidable contact surface 5a slidably in contact with the partially spherical first slidable contact surface 3a formed on the inner peripheral surface of the branch receiving pipe portion 3 of the split joint body A1. The inner diameter of the split fitting body A1 that allows the branch receiving pipe section 3 to be inserted and removed from the second pipe axis Y direction of the spherical portion 5A of the insertion pipe section 5 that is concentric with the axial core of the split coupling body A1. It is configured.

  Further, of the inner peripheral surface of the branch receiving pipe portion 3 of the split joint body A1, the portion on the opening side that is continuous with the first sliding contact surface 3a that is in sliding contact with the second sliding contact surface 5a of the insertion tube portion 5 A second elastic sealing material 19 made of an annular synthetic rubber that seals (watertight) between the joint surfaces of the branch receiving pipe section 3 and the insertion pipe section 5 that face each other; A sliding contact guide member 20 having a partial spherical third sliding contact surface 20a that is in sliding contact with the sliding contact surface 5a and a C-shaped retaining member 21 that prevents the sliding contact guide member 20 from moving out are mounted. Yes.

  In addition, between the branch receiving pipe portion 3 and the gate valve B of the split joint body A1, the upstream insertion tube portion 5 is temporarily fixed with respect to the branch receiving pipe portion 3. The means 22 is provided so as to be freely fixed.

  The temporary fixing fixing means 22 integrally forms connecting pieces 3A at a plurality of locations in the circumferential direction of the outer peripheral surface of the branch receiving pipe portion 3, and among the constituent members of the gate valve B, the upstream inlet pipe. The valve case portion 23 formed integrally between the portion 5 and the downstream insertion tube portion 6 is opposed to each connecting piece 3A on the branch receiving tube portion 3 side in the second tube axis Y direction. The connecting piece 23A is integrally formed to project, and the temporary fixing bolt 22A is inserted across the connecting pieces 3A and 23A facing each other in the second tube axis Y direction. The nut 22B screwed to the front end side of the threaded portion of the tube is operated to be tightened so that the branch receiving tube portion 3 and the upstream insertion tube portion 5 are bent or neutrally aligned so that their tube axes coincide with each other. It is comprised so that it may fix temporarily.

  Next, the pipe connection structure between the downstream insertion port 6 of the gate valve B and the receiving piping 11 of the branch piping system will be described. As shown in FIGS. When both pipe parts 6 and 11 move relatively away along the second pipe axis X2 between the pipe part 6 and the branch pipe system receiving pipe part 11 fitted and connected thereto, the second pipe axis Detachment prevention means D that contacts each other from the direction of the core X2 and prevents further detachment movement, and bend prevention means that maintains the downstream insertion pipe section 6 and the branch piping system receiving pipe section 11 in a coaxial core state. E and a third elastic sealing material 25 made of an annular synthetic rubber capable of sealing between the outer peripheral surface of the downstream insertion tube portion 6 and the inner peripheral surface of the branch piping system receiving tube portion 11 are provided. And at the outer peripheral surface of the downstream insertion tube section 6 and at a plurality of locations (four locations in the present embodiment) that are equally spaced in the circumferential direction. Tubing receiver pipe portion 11 (which is an example of a pipe connection protruding portions) end surface and the engagement depth that regulating projections Setto from the second pipe axis X2 direction 26 are formed.

  As shown in FIG. 5, the separation preventing means D is formed in an annular mounting groove 11a formed on the inner peripheral surface of the branch piping system receiving pipe portion 11 in the second pipe axis X2 direction view. A metal lock ring 27 that is elastically deformable on the diameter-enlarged side formed in a substantially C shape, and the lock ring 27 is coaxial with the branch pipe system receiving pipe section 11 in a state that allows the diameter-expansion deformation. An elastic holding ring 28 for holding in a core state is attached, and both pipe parts 6 and 11 are formed at the distal end of the outer peripheral surface of the downstream insertion pipe part 6 due to an earthquake, uneven settlement, or the like. An annular retaining protrusion (which prevents the relative disengagement of both the pipe portions 6 and 11 by contacting the lock ring 27 from the direction of the second tube axis X2 when the relative disengagement movement exceeds a certain level. 29, which is an example of a pipe connecting projection, is integrally formed to project.

As shown in FIG. 5, the bending prevention means E is configured such that the outer peripheral surface of the downstream insertion tube portion 6 is continuous with the fitting depth regulating protrusion 26 and the circumferential intermediate portion thereof. each of, together with the bending preventing collision force 3 0 small consisting of projecting margin than the fitting depth restricting projection 26 is integrally formed, the branch piping system receiver pipe portion 11, the downstream side inserted pipe A metal bending prevention ring 31 that is elastically deformable on the diameter-expanding side that contacts the plurality of bending prevention protrusions 30 of the portion 6 and presses a plurality of circumferential directions of the bending prevention ring 31 inward in the pipe diameter direction. Thus, a plurality of set bolts 32 that are reduced in diameter are provided.

  As shown in FIG. 3, the joint pipe 7 is formed on the other end portion of the fitting pipe portion 7 </ b> B that is externally fitted to the downstream insertion tube portion 6 from the second tube axis X <b> 2 direction. A connecting flange portion 7A for flange joining to the connecting flange portion 8A of the drilling machine C that can be fed through the side insertion tube portion 6 is integrally formed. The connection flange portion 7A includes a downstream flange portion 6A. An annular contact portion 7C that can come into contact with the tip from the direction of the second tube axis X2 is integrally formed, and the fitting tube portion 7B has a first protrusion 29 of the retaining projection 29 of the downstream insertion tube portion 6. Of the two pipe axis X2 direction both ends, the joint pipe 7 is tightened in a state in which it is engaged with the retaining engagement surface 29a that is one end part on the side away from the insertion tip in the second tube axis X2 direction. And the downstream insertion tube section 6 are provided with fixing means F for relatively pulling and moving them. .

  Further, between the contact portion 7C of the joint pipe 7 and the distal end of the downstream insertion tube section 6, relative movement of the joint pipe 7 and the downstream insertion tube section 6 by the fastening operation of the fixing means F is performed. A sealing material 34 such as an O-ring that is sandwiched together is interposed. Specifically, in the annular space surrounded by the contact portion 7C of the connecting flange portion 7A, the annular inclined surface 6a formed on the distal end side of the outer peripheral surface of the downstream insertion tube portion 6, and the inner peripheral surface of the fitting tube portion 7B. When the joint pipe 7 and the downstream insertion tube portion 6 are relatively pulled and fixed as the fixing means F is tightened, the downstream insertion tube portion 6 The space between the outer peripheral surface and the inner peripheral surface of the joint pipe 7 is sealed with a sealing material 34.

  The fixing means F includes an annular connecting flange portion 7D integrally formed at one end of the fitting tube portion 7B of the joint tube 7 and a retaining engagement surface of the retaining projection 29 of the downstream insertion tube portion 6. The holding member 35 that can be engaged with 29a from the second tube axis X2 direction, and the holding member 35 and the connecting flange portion 7D are tightened and fixed while relatively moving along the second tube axis X2 direction. It is comprised from the screw-type fixing tool 36 to do.

  The presser member 35 has a semicircular split connecting flange portion at one end of a pair of semicylindrical split presser cylinders 35A that can be mounted on the outer peripheral surface of the downstream insertion tube portion 6 from the radially outer side. 35B is configured to be fixedly attached, and each of the divided connection flange portions 35B is fixedly connected to both ends in the pipe circumferential direction via bolts 37 and nuts 38 in the pipe circumferential direction. The connecting flange portion 35a is integrally formed so as to protrude outward in the pipe radial direction.

The screw-type fixture 36 includes a bolt 36A inserted through the connecting flange portion 7D of the joint pipe 7 and the divided connecting flange portion 35B of the holding member 35, and a nut 36B screwed to the tip end side thereof. Then, by screwing the bolts 36A and nuts 36B to the tightening side in a state where the distal ends of both split presser cylinders 35A of the presser member 35 are engaged with the lockout locking surfaces 29a of the lockout protrusions 29, a spigot tip of the downstream inserted pipe section 6 to the state equivalent have enough portion 7C of the joint tube 7 abuts, the second tube axis and dividing joining flange portions 35B of the connection flange portion 7D and the pressing member 35 of the joint tube 7 It is configured to be fastened and fixed while relatively moving along the direction of the core X2.

  The rotary cutting tool 40 of the drilling machine C is integrally formed with a bottomed cylindrical hole saw 40A provided with a cutting tip at the tip thereof and protruding forward from the cutting center from the rotational center position of the bottom. And a center drill 40B.

Next, a method for attaching the perforator C to the downstream insertion tube portion 6 of the gate valve B will be described.
(1) A pair of fitting pipes 7B of the joint pipe 7 fitted to the downstream insertion pipe part 6 of the gate valve B from the second pipe axis Y direction and constituting a pressing member 35 of the fixing means F. of the split presser cylinder 35 a and mantle on the downstream side inserted pipe section 6, of the both split connecting flange portion 35B of the pipe circumferential ends to form a joining flange portions 35a, joining flange portions 35a opposing each They are fixedly connected to each other through bolts 37 and nuts 38.
(2) The bolt 36A is inserted through the connecting flange portion 7D of the joint pipe 7 and the divided connecting flange portion 35B of the holding member 35, and the nut 36B is screwed to the tip side of the bolt 36A. When the bolts 36A and nuts 36B are screwed to the tightening side in a state where the ends of both split presser cylinders 35A are engaged with the retaining engagement surfaces 29a of the retaining projections 29, the insertion of the downstream inlet tube portion 6 is performed. mouth tip to state those have enough portion 7C of the joint tube 7 abuts relatively along the dividing connection flange portion 35B of the connecting flange portion 7D and the pressing member 35 of the joint tube 7 to the second pipe axis X2 direction It is drawn and moved.

(3) The distal ends of both split retainer cylinders 35A of the retainer member 35 engage with the retaining engagement surface 29a of the retaining protrusion 29, and the joint tube 7 is connected to the distal end of the downstream insertion tube section 6. it can be those have enough portion 7C of the fastening operation of the bolt 36A · nut 36B in abutment with, to firmly fix connecting the downstream inserted pipe part 6 and the joint tube 7 which is fitted thereto.

(4) At this time, since the sealing member 34 to the inner corner portion formed by the inner periphery of the fitting tube portion 7B of the joint tube 7 and a person have enough portion 7C is mounted, tightening of the fixing means F Operation An annular inclined surface formed on the front end side of the outer peripheral surface of the connecting portion 7C of the connecting flange portion 7A and the downstream side insertion tube portion 6 as the joint pipe 7 and the downstream side insertion tube portion 6 move relative to each other. 6a and the inner peripheral surface of the fitting tube portion 7B are clamped, and the space between the outer peripheral surface of the downstream insertion tube portion 6 and the inner peripheral surface of the joint tube 7 is sealed with a sealing material 34.

  Therefore, the seal member 34 disposed in the annular space surrounded by the contact portion 7C of the joint tube 7, the annular inclined surface 6a of the downstream insertion tube portion 6 and the inner peripheral surface of the fitting tube portion 7B, Since the joint pipe 7 and the downstream insertion tube portion 6 are clamped in a sealed state by the relative pulling movement by the fastening operation of the fixing means F, the joint tube 7 is removed from the downstream insertion tube portion 6. When removing, the sealing material 34 does not become a pull-out resistance of the joint pipe 7, and the disassembly work of the joint pipe 7 can be performed efficiently and easily.

  (5) When the drilling operation by the drilling machine C is completed, the drilling machine C is removed from the connecting flange portion 7A of the joint pipe 7 as shown in FIG. The joint pipe 7 is removed from the mouth pipe section 6, and the receiving pipe section 11 of the branch piping system is fitted and connected to the downstream insertion pipe section 6 of the gate valve B in a sealed state.

[Second Embodiment]
In the first embodiment described above, as for a tube connection collision force portion on the outer circumferential surface formed so as to protrude in the inserted pipe section 6, the pipe axis to the locking ring 27 which is held on the inner peripheral surface of the receiving pipe section 11 Although it was carried out by using the retaining protrusion 29 that abuts from the direction and prevents the detachment movement of both the pipe parts 6 and 11, as shown in FIGS. 1 and 6 to 8, the end face of the receiving pipe part 11 And a fitting depth restricting protrusion 26 that abuts from the tube axis direction and a bend preventing ring 31 that is held on the inner peripheral surface of the receiving tube portion 11 and that can be pressed and moved radially inward. contact with, it may be performed by using a bending prevention impact force 30 to maintain the inserted pipe section 6 and the receiver pipe portion 11 coaxially core state.

  Moreover, in this 2nd Embodiment, it is an example of the projection part for pipe | tube connection of the insertion tube part 6 to the fixing means F which moves the joint pipe 7 and the insertion tube part 6 relatively and moves and fixes them. Rotation restricting means G that prevents relative rotation between the insertion tube portion 6 and the joint tube 7 caused by the driving reaction force of the drilling machine C by engaging with the fitting depth restricting protrusion 26 from the circumferential direction. Is provided.

  As shown in FIGS. 6 to 8, the fitting pipe 7 is configured to be fitted from the tube axis direction in a state extending over the retaining projection 29 and the bending prevention projection 30 of the insertion tube portion 6. A connecting flange portion 7A for flange joining with the connecting flange portion 8A of the drilling machine C that can be fed through the insertion tube portion 6 is formed integrally with the other end portion of the joint tube portion 7B. An annular contact portion 7C that can be brought into contact with the distal end of the insertion tube portion 6 from the tube axis direction is integrally formed, and the fitting tube portion 7B has a fitting depth of the insertion tube portion 6. The joint pipe 7 and the insertion opening are tightened by a tightening operation in a state where both ends of the restriction projection 26 in the tube axis direction are engaged with the rear end surface 26a which is one end portion on the side away from the insertion tip end in the tube axis direction. Fixing means F is provided for relatively pulling and moving the tube portion 6.

  Furthermore, it is surrounded by the contact portion 7C of the connecting flange portion 7A of the joint pipe 7, the annular inclined surface 6a formed on the distal end side of the outer peripheral surface of the downstream insertion tube portion 6, and the inner peripheral surface of the fitting tube portion 7B. When the sealing material 34 is disposed in the annular space and the joint pipe 7 and the downstream inlet pipe portion 6 are relatively pulled and fixed as the fixing means F is tightened, the downstream inlet pipe The outer peripheral surface of the part 6 and the inner peripheral surface of the joint pipe 7 are configured to be sealed with a sealing material 34.

  The fixing means F includes an annular connecting flange portion 7D integrally formed at one end portion of the fitting tube portion 7B of the joint tube 7, and a rear end surface 26a of the fitting depth regulating projection 26 of the insertion tube portion 6. The screw-type fixing that fastens and fixes the pressing member 35 that can be engaged from the direction of the second tube axis X2 and relatively pulling and moving the pressing member 35 and the connecting flange portion 7D along the tube axis direction. The tool 36 is composed.

  The presser member 35 includes a pair of half-split split pressers 35C that can be mounted on the outer peripheral surface of the insertion tube portion 6 from the radially outer side, and the pipe periphery of each split presser 35C. At both ends in the direction, connecting flange portions 35b for fixing and connecting adjacent ones in the pipe circumferential direction via bolts 37 and nuts 38 are integrally formed protruding outward in the pipe radial direction. Yes.

The rotation restricting means G is integrally formed with a restricting protrusion 41 that can be engaged with each fitting depth restricting protrusion 26 from the circumferential direction on the connecting flange portion 7D of the joint pipe 7 that is a constituent member of the fixing means F. Then, the relative rotation between the insertion tube portion 6 and the joint tube 7 caused by the driving reaction force of the drilling machine C is achieved by the engagement of each fitting depth restriction protrusion 26 and the restriction protrusion 41 from the circumferential direction. It is configured to block.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
An improvement of the pipe connection structure described in the first embodiment described above is shown, and a contact portion 7C that can come into contact with the distal end of the insertion tube portion 6 from the tube axis direction is formed at the other end portion of the joint tube 7. In this contact portion 7 </ b> C, the axial center of the joint tube 7 is aligned with the axial center of the inlet tube portion 6 by being fitted in from the tube axis direction while being in sliding contact with the inner peripheral surface of the inlet tube portion 6. A cylindrical centering guide portion 42 is integrally formed.

Then, until the contact portion 7C formed at the other end portion of the joint pipe 7 comes into contact with the distal end of the mouthpiece pipe section 6, the joint pipe 7 is pushed into and fitted into the mouthpiece pipe section 6 to thereby insert the mouthpiece. The joint pipe 7 can be attached to the pipe portion 6 in a predetermined fitting posture. Moreover, since the centering guide portion 42 formed in the contact portion 7C is fitted in from the tube axis direction in a state of sliding contact with the inner peripheral surface of the insertion tube portion 6, the shaft core of the joint tube 7 is the insertion tube. Since it matches or substantially matches the axis of the portion 6, the drilling machine C does not slide on the inner wall surface of the insertion tube portion 6, and damage due to cutting or the like of the inner wall surface of the insertion tube portion 6 by the drilling machine C occurs. It can be avoided.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
In the third embodiment, the centering guide portion 42 is formed in a cylindrical shape. However, the centering guide portion 42 may be formed of a plurality of guide bodies that are located at intervals in the circumferential direction.

  In short, the centering guide portion 42 is fitted in from the tube axis direction while being in sliding contact with the inner peripheral surface of the insertion tube portion 6, thereby connecting the shaft core of the joint tube 7 to the shaft of the insertion tube portion 6. What is necessary is just to provide the guide function which can be matched with a core.

[Other Embodiments]
(1) In each of the embodiments described above, the fixing means F can be engaged with the connecting flange portion 7 formed at one end portion of the joint pipe 7 and the one end portion of the pipe connecting projection portion from the tube axis direction. The presser member 35 and the screw-type fixture 36 that fastens and fixes both the members 7 and 35 along the axial direction of the tube axis are fixed. By the tightening operation in a state where the tube portion 7B is engaged with one end portion on the side away from the distal end of the insertion port in the tube axis direction, among the both ends of the tube connection projection of the tube connection portion 6 in the tube axis direction. Any structure may be used as long as the joint pipe 7 and the insertion tube section 6 can be relatively pulled and fixed.

  (2) As the rotation restricting means G, the insertion tube portion 6 resulting from the drive or operation of the in-pipe work machine C is engaged with the tube connection projection of the insertion tube portion 6 from the circumferential direction. Any structure may be used as long as relative rotation between the pipe and the joint pipe 7 can be prevented.

  (3) In each of the above-described embodiments, the drilling machine is exemplified as the in-pipe working machine C. However, the drilling machine is not limited to this. For example, the upstream flow path can be blocked through the insertion tube portion 6. A pipe closing jig provided with a flexible elastic closing body may be used.

1 shows a first embodiment of the present invention, in which (a) is a partially cutaway front view when a drilling machine is attached, and (b) is a partially cutaway front view when a receiving pipe portion is fitted and connected after drilling. Figure Front view of the enlarged part of the main part when the drilling machine is installed Enlarged partially cutaway front view of the connection structure between the insertion tube and the joint tube Exploded perspective view of the connection structure between the inlet tube and the joint tube Enlarged sectional front view of the main part when fitting and connecting the receiving pipe part The expanded sectional view of the principal part in the connection structure of the insertion pipe part and joint pipe which shows 2nd Embodiment of this invention (A) is an exploded perspective view of the main part in the connection structure of the insertion tube part and the joint pipe, (B) is an exploded perspective view of the main part when the joint pipe is externally fitted. Enlarged sectional view of the main part in the connection structure between the inlet tube and the joint tube Enlarged partially cutaway front view of the main part showing the third embodiment of the present invention

Explanation of symbols

C In-pipe working machine (drilling machine)
F fixing means G rotation restricting means X1 first tube axis X2 second tube axis 6 insertion tube portion (downstream insertion tube portion)
6a inclined annular surface 7 fitting 7A joining flange portions 7B Hamagokan portion 7C those other Ri unit 11 receiver pipe portion 26 pipe connecting protrusion (protrusion for fitting depth restriction)
27 Lock ring 29 Protrusion for pipe connection (Protrusion prevention)
30 for bending piece preventing collision force 31 for bending prevention ring 34 sealing material 35 pressing member 36 threaded fastener

Claims (6)

The outer peripheral surface of the inserted pipe section is inserted into and connected from the tube axis direction to the receiver pipe portion, formed tube connecting butt raised portion projecting radially outward, as projections for the tube connection, the socket A retaining projection provided at the distal end portion of the insertion tube portion that comes into contact with the lock ring held on the inner peripheral surface of the tube portion from the tube axis direction to prevent detachment movement of both tube portions, and a receiving tube portion A fitting depth regulating protrusion that comes into contact with the outer end surface of the tube from the tube axis direction,
To the other end of the joint pipe provided with a fitting pipe part fitted from the pipe axis direction with a sealant interposed between the insertion pipe part and the outer peripheral surface of the insertion pipe part Is formed with a connecting flange portion for flange connection with an in-pipe work machine that can be fed through the insertion tube portion, and the contact flange portion can contact the tip of the insertion tube portion from the tube axis direction. Is a pipe connection structure formed,
At one end of the joint pipe, the pipe at one end of the side away from the pipe axis direction end portions sac Chi interpolation opening tip of the retaining projection or fitting depth restricting projection of the inserted pipe section in the pipe axis direction A fixing means for fixing the joint tube and the insertion tube portion by relatively pulling and moving in the tube axis direction by a tightening operation in a state where the presser member engageable from the axis direction is engaged is provided ,
A contact portion of the connecting flange portion formed at the other end portion of the joint pipe, an annular inclined surface formed at the distal end side of the outer peripheral surface of the retaining projection of the insertion tube portion, and an inner peripheral surface of the fitting pipe portion of the joint pipe The sealing material is arranged in an annular space surrounded by a ring, and the sealing material is clamped as the joint pipe and the insertion tube part are relatively pulled by the fastening operation of the fixing means, and the outer periphery of the insertion tube part A pipe connection structure for sealing between the surface and the inner peripheral surface of the fitting pipe portion of the joint pipe . The fixing means is provided with a rotation restricting means for preventing relative rotation between the insertion tube portion and the joint tube by engaging the tube connection projection of the insertion tube portion from the circumferential direction. The pipe connection structure according to claim 1 . In the contact portion formed at the other end portion of the joint pipe, the shaft center of the joint pipe is inserted into the insertion tube portion by being fitted from the tube axis direction in a state of sliding contact with the inner peripheral surface of the insertion tube portion. pipe connection structure according to claim 1 or 2, wherein centering guide portion to align the the axis is formed. The fixing means, clamping and connection flange portion formed at one end of the joint pipe, and the pressing member, while moving relative pull pulling them along both the pipe axis direction, formed at the other end of the joint pipe claimed in any one of claims 1 to 3, and a threaded fastener has been the tip of the contact portion and the inserted pipe section of the connection flange portion is fixed in a state in contact with a tube axis direction of the tube connection structure. The contact between the receiving port tube portion inner peripheral surface retained diametrically contracted elastic deformable bending prevention ring, for bending prevention to maintain the inserted pipe section and the receiver pipe portion coaxially state pipe connection structure according to collision Kiga, any one of claims 1 to 4 provided to project radially outward to the outer circumferential surface of the inserted pipe section. As a tube connecting butt raised portion projecting radially outward, inserted pipe to prevent withdrawal movement of the two pipe portions in contact with the lock ring held in an inner circumferential surface of the receiving pipe section from the pipe axis direction The fitting tube is fitted into the insertion tube portion provided with a retaining protrusion provided at the distal end of the tube portion, and a fitting depth regulating protrusion that comes into contact with the outer end surface of the receiving tube portion from the tube axis direction. The joint portion is externally fitted in a sealed state with a sealing material interposed between the outer peripheral surface of the insertion tube portion and the inner peripheral surface of the fitting tube portion from the tube axis direction . the joining flange portions formed at the other end, a mounting method of the pipe work machine to inserted pipe section to affix connected sealingly mounting flange portion of the possible pipe work machine fed through the inserted pipe portion ,
Fixing means provided at one end of the joint pipe fitted to the insertion tube portion is inserted into the insertion tube portion at both ends in the tube axis direction of the retaining protrusion of the insertion tube portion or the fitting depth regulating projection. Tighten with the presser member that can be engaged from the tube axis direction to one end that is away from the tip in the tube axis direction. The outer peripheral surface tip of the stopper projection of the insertion tube portion and the contact portion formed on the connecting flange portion of the other end portion of the joint pipe and abutting from the tube axis direction on the distal end of the insertion tube portion. The sealing material disposed in the annular space surrounded by the annular inclined surface formed on the side and the inner peripheral surface of the fitting tube portion of the joint tube, the joint tube and the inlet tube portion by tightening operation of the fixing means As the relative pulling movement of the fitting tube is performed, the gap between the outer peripheral surface of the inlet tube portion and the inner peripheral surface of the fitting tube fitting portion is sealed. Mounting method tube working machine to inserted pipe section for attaching the pipe work machine connecting flange portion on an end portion.

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