JP2010070971A - Method for pulling out lining material after construction - Google Patents

Abstract

An object of the present invention is to provide a method capable of pulling out an inner surface of an existing pipe line when the lining material lined for the purpose of repair, reinforcement or rehabilitation has deteriorated.
SOLUTION: A slit 4 is formed in a lining material 2 lined on a main pipe 1, and a high-strength linear body 5 locked in the vicinity of the slit 4 portion is pulled, so that the lining material is removed from the main pipe 1. Pull out 2 while peeling. Further, the inside of the lining material 2 lined on the main pipe 1 is hermetically sealed, and the inside of the lining material 2 is decompressed, whereby the lining material is peeled off from the main pipe 1 and the cross-sectional shape is reduced. Pull the lining material 2 out of the tube 1. Further, by twisting from one end of the lining material 2 lining the main pipe 1, the lining material 2 is separated from the main pipe 1, and then the lining material 2 is pulled out from the main pipe 1.
[Selection] Figure 1

Description

  The present invention relates to a method for removing a lining material lined for the purpose of repairing, reinforcing or rehabilitating an inner surface of an existing pipeline such as a sewer pipe, a water pipe, a gas pipe or the like.

  The lining material that is lined on the inner surface of existing pipes buried in the ground, such as sewer pipes, water pipes, gas pipes, etc., and that has at least a resin material, is used as a lining material when it has deteriorated due to long-term use, etc. May need to be removed from the existing pipeline. However, since the lining material is in close contact with the inner surface of the existing pipe line, it is not easy to pull out and requires a very large force. Therefore, a method for pulling out the lining material lined in the existing pipe line has been proposed. For example, both ends of the plastic pipe lined in the existing pipe line are tightly adhered, and the inside of the plastic pipe is decompressed to reduce the plastic pipe. Is peeled from the inner surface of the existing pipe line, and the cross-sectional shape is reduced and deformed, and then a plastic pipe is pulled out from the existing pipe line (see Patent Document 1).

Japanese Patent No. 3285668

  However, generally, since there is a branch pipe in the sewer pipe, after the lining material is brought into close contact with the inner surface of the existing pipe line, an operation for perforating a branch pipe opening in the lining material is performed. Therefore, branch pipe openings are perforated in some places in the lining material lined on the existing pipeline. On the other hand, in the method described in Patent Document 1, when the branch pipe opening is perforated in the plastic pipe, the air flows from the branch pipe opening, so that the inside of the plastic pipe cannot be decompressed well. Therefore, the plastic pipe cannot be pulled out from the existing pipeline.

  The present invention has been made in view of the above circumstances. The purpose of the present invention is when the lining material lined on the inner surface of an existing pipe line becomes obsolete, and the need for repair, rehabilitation, etc. arises. Even when the opening for the branch pipe is perforated in the material, it is to provide a method capable of easily removing the lining material.

Means for Solving the Problems and Effects of the Invention

  A first feature of a method for pulling out a lining material according to the present invention for solving the above-mentioned problem is a method for removing a lining material that is lined in an existing pipeline and has at least a resin material, the lining material being A slit forming step for inserting a slit along the longitudinal direction of the lining material, and a linear body engaging the high-strength linear body in the vicinity of the slit portion of the lining material, in the longitudinal direction of the lining material. A pulling step, and pulling the locked high-strength linear body to pull the lining material from the inner surface of the existing pipe while pulling the lining material from the existing pipe. is there.

  According to this configuration, first, by forming a slit from one end of the lining material to the other end along the longitudinal direction of the lining material, a part of the circumference of the lining material is cut out in an arc shape. Therefore, the shape of the cross section of the lining material orthogonal to the longitudinal direction of the lining material is substantially C-shaped. Next, the high-strength linear body is locked in the vicinity of the slit portion of the lining material, which is the end portion in the longitudinal direction of the lining material. And by pulling the high-strength linear body, the lining material shrinks in the inner diameter direction of the existing pipe line so that both ends of the slit portion of the lining material are combined, so the peripheral length of the lining material is shortened, and the lining material and The close contact of the existing pipe line is released. As a result, the frictional resistance between the lining material and the existing pipeline is reduced, and the lining material can be easily pulled out from the existing pipeline while the lining material is peeled off from the inner surface of the existing pipeline.

  The second feature of the method of pulling out the lining material according to the present invention is a method for removing the lining material that is lining the existing pipe line and has at least a thermoplastic resin material, and heating the lining material. A heating step, a sealing step of hermetically sealing both longitudinal ends of the lining material and the branch pipe opening of the lining material, and depressurizing the inside of the sealed lining material so that the lining material is A lining material peeling step for peeling from the inner surface of the pipe line; and a lining material drawing step for drawing the peeled lining material from the existing pipe line.

  According to this configuration, first, a sealing step of hermetically sealing both the longitudinal ends of the lining material and the branch pipe opening of the lining material is performed. Therefore, even when the branch pipe opening is perforated in the lining material, air can be prevented from flowing into the lining material in the subsequent decompression. Next, the inside of the lining material is decompressed. Thereby, since the lining material can be buckled, the cross-sectional shape of the lining material is reduced, and the adhesion between the lining material and the existing pipe line is released. As a result, the frictional resistance between the lining material and the existing pipeline is reduced, and the lining material can be easily pulled out from the existing pipeline.

  A third feature of the method of pulling out the lining material according to the present invention is a method for removing the lining material that is lining the existing pipe line and has at least a thermoplastic resin material, and heating the lining material. A heating step, a lining material peeling step for twisting the lining material from one end of the lining material in the circumferential direction, and peeling the lining material from the inner surface of the existing pipe line; and the peeled lining material in the existing pipe line And a lining material drawing step for drawing from the lining material.

  According to this configuration, by applying torsion from one end of the lining material lined to the existing pipeline, it is possible to release the adhesion between the existing pipeline and the lining material while peeling the lining material from the existing pipeline. Further, by adding torsion, the cross-sectional area of the lining material is reduced to become a rod shape, and it is possible to suppress the lining material from being torn in the existing pipe line. As a result, the frictional resistance between the lining material and the existing pipeline is reduced, and the lining material can be easily pulled out from the existing pipeline.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, a sewer pipe is assumed as the pipe. However, in the present invention, the pipe is not necessarily limited to the sewer pipe, and if it is an existing pipe, for example, a water pipe It can be applied to various pipelines such as agricultural water pipelines.

  First, a first embodiment of the present invention will be described.

[First embodiment]
(Slit forming process)
FIG. 1 is a diagram showing a schematic cross-sectional view in the radial direction of the lining material when the invention according to the first embodiment of the present invention is carried out in a sewer pipe as an example of an existing pipe that has been rehabilitated. . FIG. 1A shows a schematic cross-sectional view in the radial direction of an inner surface of a main pipe 1 with a lining material 2 lining. FIG. 1 (b) shows a radial cross-sectional schematic view of a cut portion 3 provided along the longitudinal direction of the lining material 2 lined on the inner surface of the main pipe 1. FIG. 1C shows a schematic cross-sectional view in the radial direction when the cut portion 3 provided along the longitudinal direction of the lining material 2 lined on the inner surface of the main pipe 1 is removed to form the slit 4 portion. The cross-sectional shape of the lining material 2 shown in FIGS. 1B and 1C is a shape formed in the slit forming step. FIG. 3 is a view showing an embodiment of a slit forming process according to the first embodiment of the present invention.

  In the embodiment shown in FIG. 3A, a slit forming step of forming the slit 4 in the lining material 2 lined on the inner surface of the main pipe 1 of the sewer pipe as an example of the existing pipe by using the cut jig 6. FIG. A high strength linear body 5 is connected to both ends of the cut jig 6. On the other hand, when the lining material 2 has a thermoplastic resin, the lining material 2 can be heated and softened with steam by using the tip heating jig 7 as shown in FIG. It becomes easy to form the slit 4 in the lining material 2. The tip heating jig 7 has one end connected to the high-strength linear body 5 and the other end connected to the steam hose 8. Moreover, since one end of the steam hose 8 is connected to the boiler 13 (not shown), steam is supplied from the boiler 13 to the tip heating jig 7 via the steam hose 8.

  Here, the cut jig 6 will be described. FIG. 4 is a view showing the cut jig 6 according to the first embodiment. FIG. 4A is a schematic perspective view of the cut jig 6. FIG.4 (b) is AA sectional drawing schematic of the cut jig 6 shown to Fig.4 (a).

  One protrusion 31 is provided at each of the center portions of the cut jig 6 (see FIG. 4) in the cutting direction. The cut jig 6 is provided with two cutters 30. A hole 32 is opened on the back surface of the cut jig 6.

  In addition, since it is necessary to release the adhesion between the main pipe 1 and the lining material 2 by performing the lining material drawing process (see FIG. 2) according to the first embodiment of the present invention, the slit 4 has a predetermined width. There is a need. Here, when the slit 4 is formed in the lining material 2 using the cut jig 6, the width between the cutters 30 becomes the width of the slit 4. Therefore, the width between the cutters 30 of the cut jig 6 is designed so that the slit 4 has a predetermined width. Therefore, it is possible to select the cut jig 6 according to the specifications and inner diameter of the existing pipeline. The shape of the cut jig 6 is not limited to the shape described above (see FIG. 4).

  As a flow of work for performing the slit forming step according to the first embodiment using the cut jig 6 described above, first, after connecting the high-strength linear body 5 to each projection 31, the tip of the cut jig 6 Is inserted between the main pipe 1 and the lining material 2. Next, by applying tension to each high-strength linear body 5 and keeping the cutting jig 6 horizontal, the cutting jig 6 is pulled along the cutting direction, so that two cut portions 3 are simultaneously provided on the lining material 2. Can do. Then, a part of the notched lining material 2 is cut off from the lining material 2 and removed through the hole 32 at the same time, so that a part of the notched lining material 2 is advanced by the cutting jig 6. Since the cut portion 3 can be formed and removed at a time without obstructing the workability, the workability is good (see FIGS. 3A and 3B).

  Thereby, the slit 4 can be formed from one end of the lining material 2 to the other end by pulling the cut jig 6 from one end of the lining material 2 to the other end. Therefore, the shape of the cross section of the lining material 2 orthogonal to the longitudinal direction of the lining material 2 is substantially C-shaped (see FIG. 1C). The method of forming the slit 4 in the lining material 2 is not limited to the method of forming the slit 4 using the cut jig 6 as described above. Further, when forming a gap for inserting the front end of the cut jig 6 between the main pipe 1 and the lining material 2, slits are formed by using knobs 24 and 25 described later for lifting the lining material 2. The process can be performed smoothly.

(Linear body locking process)
FIG. 2 is a view showing a state in which the close contact between the main pipe 1 and the lining material 2 is released by carrying out the invention according to the first embodiment of the present invention. As a method of pulling out the lining material 2 from the main pipe 1, first, from the state in which the slit 4 is formed in the lining material 2 (see FIG. 1C), the end of the lining material 2 in the longitudinal direction, A linear body locking step of locking the high-strength linear body 5 in the vicinity of the slit 4 portion is performed (see FIG. 2). One end of the high-strength linear body 5 is connected to the winch 20 (not shown).

(Lining material drawing process)
Next, as shown in FIG. 2, by pulling the high-strength linear body 5 so that both ends of the slit 4 portion of the lining material 2 are combined, the lining material 2 shrinks in the inner diameter direction of the existing pipe line, The peripheral length of the lining material 2 is shortened, and the adhesion between the lining material 2 and the existing pipe line is released. As a result, it is possible to perform a lining material drawing process in which the lining material 2 is pulled out from the existing pipeline while the lining material 2 is peeled off from the existing pipeline inner surface. FIG. 1 (d) shows a radial cross-sectional schematic view of the lining material 2 and the main pipe 1 that have been released from the close contact after the lining material drawing step has been performed. The high-strength linear body 5 is preferably a wire rope made of steel or resin, a chain, or the like.

  The width of the two cut portions 3 shown in FIG. 1B is such that the lining material 2 is formed by pulling the high-strength linear body 5 locked in the vicinity of the slit 4 portion of the lining material 2. It is assumed that the pipe 1 is contracted in the inner diameter direction to shorten the peripheral length, and has a predetermined width so that a gap is formed between the main pipe 1 and the lining material 2. When the width between the cut portions 3 is narrow, the lining material 2 cannot be contracted in the inner diameter direction of the existing pipe line by contacting both ends of the slit 4 when performing the lining material drawing step. The width of the cut part 3 is preferably wider. The cut portion 3 is provided from one end to the other end of the lining material 2 along the longitudinal direction of the lining material 2.

  Here, the form of the lining material 2 lined in the existing pipeline for the purpose of repair / reinforcement / rehabilitation will be described.

  As the lining material 2 lined on the existing pipe line, for example, the outer diameter before expansion is substantially the same as the inner diameter of the existing pipe line, and the inner surface of the tubular woven fabric 36 has an inner hard thermoplastic resin layer 34 and an outer surface. The thing in which the outer surface hard thermoplastic resin layer 35 was formed is mentioned. Here, the tubular woven fabric 36 is a seamless tubular woven fabric composed of wefts 38 continuously woven in a spiral shape with respect to the warp yarn 37 (see FIG. 10). For this reason, the cylindrical woven fabric 36 has a high breaking stress and hardly shrinks in the longitudinal direction. Therefore, when the present invention is carried out and the lining material 2 is pulled out from the existing pipeline, the lining material 2 is not broken. In addition, as said thermoplastic resin, a polyvinyl chloride resin, a polypropylene, polyethylene etc. are used, for example.

  The form of the lining material 2 is not limited to the lining material 2 described above. For example, the lining material 2 having a sheet layer made of reinforcing fibers is impregnated with a thermosetting resin.

  Examples of the reinforcing fibers include PAN-based or pitch-based carbon fibers, glass fibers, organic fibers such as aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, polyester, and steel fibers. Or what was used by mixing multiple types is mentioned.

  Examples of the thermosetting resin include an epoxy resin, a phenol resin, an unsaturated polyester resin, a vinyl ester resin, a polyimide resin, and an acrylic resin.

  Next, a second embodiment of the present invention will be described.

[Second Embodiment]
(Heating process)
First, in 2nd Embodiment, when the lining material 2 lining the existing pipe line has a thermoplastic resin, the heating process which heats the lining material 2 is performed. This heating process is performed by feeding a heating fluid or the like into the lining material 2 or heating it using the tip heating jig 7 before performing the lining material peeling process according to the second embodiment. Thereby, since the lining material 2 is softened, it becomes easy to peel the lining material 2 from the main pipe 1 when performing the lining material peeling process described below. In addition, it is also possible to perform a heating process during the lining material peeling process.

(Sealing process)
Next, a sealing process is performed in which both ends in the longitudinal direction of the lining material 2 lined on the main pipe 1 and an opening (not shown) for the branch pipe 16 of the lining material 2 are hermetically sealed. FIG. 5 is a diagram showing an embodiment in which the invention according to the second embodiment of the present invention is implemented in a sewer pipe as an example of an existing pipe that has been rehabilitated. Reference numeral 1 in the figure denotes a main pipe 1 of a sewer pipe, which is connected between a manhole 9 and a manhole 10. FIG. 5A shows a state in which the lining material 2 renovated in the main pipe 1 is hermetically sealed. FIG. 5B shows a state in which the adhesion between the lining material 2 and the main pipe 1 is released by reducing the pressure inside the lining material 2 from an airtightly sealed state (see FIG. 5A).

  As the sealing process in the second embodiment of the present invention, first, the main pipe 1 is used with a TV camera or the like, the distance between the manholes 9 and 10, the branch pipe port of the branch pipe 16 in the main pipe 1 from the manhole 9. The distance to 17, the distance from the branch pipe 16 to the branch pipe rod 15, the depth of the branch pipe rod 15, etc. are accurately measured. Then, a sealing step is performed in which the plug 14 is drawn into both ends in the longitudinal direction of the lining material 2 and the opening for the branch pipe 16 of the lining material 2 while the position is adjusted by the TV camera, and the inside of the lining material 2 is hermetically sealed ( (See FIG. 5 (a)). The plug 14 includes a plug 14a for sealing both ends in the longitudinal direction of the lining material 2 and a branch pipe plug 14b for sealing the opening for the branch pipe 16 of the lining material 2.

  The plug 14 is constituted by a bag made of rubber and sealed inside. Specifically, the plug 14a for sealing both ends in the longitudinal direction of the lining material 2 has a cylindrical shape smaller in diameter than the inner diameter of the main pipe 1 in a state where no pressure fluid (for example, air) is introduced therein. Have. In addition, the branch pipe plug 14b for sealing the opening for the branch pipe 16 of the lining material 2 is a cylindrical portion having a diameter smaller than the inner diameter dimension of the branch pipe 16 when no pressure fluid (for example, air) is introduced therein. And has a flange shape consisting of a disk part. Further, an air hose 11 is connected to each plug 14. The plug 14a is expanded to a diameter of the inner diameter of the main pipe 1 or larger by introducing air from the air hose 11. Further, the cylindrical portion of the branch pipe plug 14 b is expanded to a diameter approximately equal to or larger than the inner diameter of the opening for the branch pipe 16 by introducing air from the air hose 11. The introduction of air into each plug 14 is performed by an air pump 29 installed on the ground and connected to the air hose 11.

  In addition, as a structure for drawing each plug 14 into the main pipe 1, a pulling wire (not shown) is provided on the side surface of the plug 14 (the surface opposite to the surface to which the air hose 11 is connected). Are connected, and one end of the wire is pulled out to the manholes 9 and 10 and the wire is pulled.

  The sealing of the both ends in the longitudinal direction of the lining material 2 is the air pressure that is drawn into the both ends in the longitudinal direction of the lining material 2 from the respective manholes 9 and 10 with the plug 14a contracted and fed by the air pump 29. Thus, the plug 14a is expanded in the radial direction of the main pipe. The opening of the branch pipe 16 of the lining material 2 is sealed by the air pressure drawn from the branch pipe rod 15 into the opening for the branch pipe 16 with the branch pipe plug 14b contracted and fed by the air pump 29. This is done by expanding the branch pipe plug 14b in the radial direction of the branch pipe 16. As a result, the outer peripheral surface of each plug 14 is in close contact with the inner peripheral surface of the lining material 2 lined on the main pipe 1 and the inner peripheral surface of the opening for the branch pipe 16 drilled in the lining material 2 for the branch pipe 16. Thus, the inside of the lining material 2 is hermetically sealed (see FIG. 5A). In addition, the air vent plug 33 is provided in the plug 14a arrange | positioned at the longitudinal direction both ends of the lining material 2 by the side of the manhole 10. FIG.

(Lining material peeling process)
The liner material peeling step according to the second embodiment of the present invention is a method in which the liner material 2 is peeled off by reducing the pressure inside the liner material 2. This method uses a decompression pump (not shown) connected to a steam hose 8 inserted into the lining material 2 through a plug 14a drawn from the manhole 9 to the longitudinal end of the lining material 2. In this method, the inside of the lining material 2 is depressurized from a state hermetically sealed by the plug 14 (see FIG. 5A). According to this method, the lining material 2 is crushed by the external pressure. And as shown in FIG.5 (b), the lining material 2 can be peeled from the main pipe 1, and the cross-sectional shape of the lining material 2 can be reduced.

  Further, the method for reducing the pressure inside the lining material 2 is not limited to the above method. For example, first, pressurized steam is fed into the lining material 2 from the steam hose 8, and the lining material 2 is filled with pressurized steam. Next, when the pressurized steam is sufficiently filled in the lining material 2, the inside of the lining material 2 is hermetically sealed by the method described above (see FIG. 5A). In addition, after sealing the inside of the lining material 2 hermetically, the lining material 2 may be filled with pressurized water vapor. Then, in the sealed lining material 2, the pressurized steam condenses as it cools, and the lining material 2 is crushed by atmospheric pressure as shown in FIG. Thus, a method of peeling the lining material 2 from the main pipe 1 and reducing the cross-sectional shape of the lining material 2 may be used. The compressor 12 and the boiler 13 feed pressurized steam into the lining material 2 via the steam hose 8.

(Lining material drawing process)
If the adhesion between the lining material 2 and the main pipe 1 is sufficiently released, each plug 14 is contracted by each air pump 29 and then each plug 14 is pulled out from the main pipe 1 through the manholes 9 and 10. . And the lining material drawing process which pulls out the lining material 2 from the main pipe 1 by connecting the high strength linear body 5 to the edge part of the longitudinal direction of the lining material 2 and pulling the high strength linear body 5 is performed. In addition, since the cross-sectional shape of the lining material 2 is reduced and the close contact between the main pipe 1 and the lining material 2 is released, the friction resistance between the lining material 2 and the main pipe 1 is reduced, and the lining material 2 is removed from the existing pipe line. It can be easily pulled out. Further, by using the tab margins 24 and 25 of the lining material 2 to be described later as a starting point when the lining material 2 is pulled out, the lining material drawing process can be performed smoothly.

  Next, a third embodiment of the present invention will be described.

[Third embodiment]
FIG. 6 is a diagram showing an embodiment in which the invention according to the third feature of the present invention is implemented in a sewer pipe as an example of an existing pipe that has been rehabilitated.

(Heating process)
First, in 3rd Embodiment, when the lining material 2 lining the existing pipe line has a thermoplastic resin, the heating process which heats the lining material 2 is performed. This heating process is performed by feeding a heating fluid or the like into the lining material 2 or heating it using the tip heating jig 7 before performing the lining material peeling process according to the third embodiment. Thereby, since the lining material 2 softens, it becomes easy to peel the lining material 2 from the main pipe 1 when performing the lining material peeling process shown below. In addition, it is also possible to perform a heating process during the lining material peeling process.

(Lining material peeling process)
Fig.6 (a) is the figure which showed the lining material peeling process which concerns on 3rd Embodiment of this invention. In the lining material peeling step, first, as shown in FIG. 6A, one end of the lining material 2 is peeled off from the main pipe 1, and the one end is crushed and fixed by a torsion jig 22. Next, the twisting jig 22 is rotated in the circumferential direction of the main pipe 1 to twist the lining material 2. As a result, as compared with the case where the lining material 2 is simply pulled and peeled off from the inner surface of the main tube 1, the lining material 2 is peeled off from the inner surface of the main tube 1 while being twisted. It can suppress that the material 2 is torn in the main pipe 1. Moreover, the lining material peeling process can be smoothly performed by using the tab margins 24 and 25 of the lining material 2 to be described later as a starting point when peeling one end of the lining material 2 from the main pipe 1.

(Lining material drawing process)
FIG. 6B shows a state in which one end of the lining material 2 is fixed by the twisting jig 22 (see FIG. 6A), and the twisting jig 22 is twisted to the lining material 2 by rotating the twisting jig 22 in the circumferential direction of the main pipe 1. The state which peeled the lining material 2 from the main pipe 1 is shown. A winch 20 is disposed on the ground near the manhole 10. The peeled lining material 2 is connected by a high-strength linear body 5 having one end connected to the winch 20. Then, by pulling the high-strength linear body 5, a lining material drawing process for drawing the lining material 2 from the main pipe 1 is performed. In addition, since the cross-sectional shape of the lining material 2 is reduced and the close contact between the main pipe 1 and the lining material 2 is released, the friction resistance between the lining material 2 and the main pipe 1 is reduced, and the lining material 2 is removed from the existing pipe line. It can be easily pulled out. Further, by using the tab margins 24 and 25 of the lining material 2 to be described later as a starting point when the lining material 2 is pulled out, the lining material drawing process can be performed smoothly.

  Next, an embodiment of a heating process according to the present invention will be described with reference to FIG. 7 in a sewer pipe as an example of an existing pipe where rehabilitation has been performed. In addition, the heating process shown below is a method which can be implemented in combination with the first to third embodiments according to the present invention as appropriate.

  First, the heating process shown in FIG. On the ground near the manhole 9, a winding drum 21 for winding the steam hose 8 is disposed. On the other hand, a winch 20 is disposed on the ground near the manhole 10. One end of the tip heating jig 7 is connected to the high-strength linear body 5, and the other end is connected to the steam hose 8. A guide portion 28 for guiding the high-strength linear body 5 that pulls the tip heating jig 7 is provided below the manhole 10. In this case, it is assumed that the tip of the high-strength linear body 5 led out from the winch 20 is led from the lower end of the manhole 10 to the lower end of the manhole 9 through the main pipe 1. Further, since one end of the steam hose 8 is connected to the boiler 13, steam is supplied from the boiler 13 to the tip heating jig 7 via the steam hose 8. And the lining material 2 is heated and softened by this steam. The steam hose 8 is gradually wound around the winding drum 21 after the lining material 2 is heated and softened.

  According to this configuration, the tip heating jig 7 located at the lower part of the manhole 10 moves to the lower part of the manhole 9 along the main pipe 1 by sequentially winding the steam hose 8 on the take-up drum 21. It will be. Thereby, the lining material 2 lined on the inner surface of the main pipe 1 is heated throughout. Furthermore, it is possible to heat only the target portion by using this method in a place where it is desired to heat locally or in a focused manner.

  Next, the heating process shown in FIG. 7B will be described. Air pumps 29 are provided on the ground near the manhole 9 and the manhole 10 and on the ground near the branch pipe 15. In order to carry out the main heating step, first, the inside of the main pipe 1 is used with a TV camera or the like, the distance between the manholes 9 and 10, and the distance from the manhole 9 to the branch pipe port 17 of the branch pipe 16 in the main pipe 1. The distance from the branch pipe 16 to the branch pipe rod 15 and the depth of the branch pipe rod 15 are measured accurately.

  Next, plugs 14 are arranged at both ends in the longitudinal direction of the lining material 2 and openings for the branch pipe 16 of the lining material while adjusting the position with a TV camera. Each air pump 29 is connected via air hose 11 to plugs 14 arranged at both ends in main pipe 1 and the opening for branch pipe 16. Therefore, when the air is fed into the plug 14 by the air pump 29, the plug 14 expands and closes both ends in the longitudinal direction of the lining material 2 and the opening for the branch pipe 16. Thereby, the inside of the main pipe 1 is hermetically sealed by the outer peripheral face of each plug 14 being in close contact with the inner peripheral face of the opening for the branch pipe 16 and the inner peripheral face of the lining material 2 lined on the main pipe 1. become. Note that the plug 14 disposed at the end of the main pipe 1 on the manhole 10 side is provided with an air vent plug 33.

  Finally, the pressurized steam is fed from the boiler 13 and the compressor 12 into the sealed lining material 2 through the steam hose 8, and the lining material 2 is filled with the pressurized steam so that the lining material 2 is heated. It will be. In addition, by opening the air vent plug 33, the pressurized water vapor filled in the lining material 2 can be discharged.

  Next, the heating process shown in FIG. First, in a state where no pressure fluid (for example, air) is introduced into the inside, the heating hose 23 having a cylindrical shape that is smaller than or substantially the same as the inner diameter of the main pipe 1 is attached to the manhole by the winch 20 or the like. 9 is pulled into the main pipe 1 which is piped between the manhole 10 and the manhole 10. The heating hose 23 is a long one extending to both ends of the main pipe 1 and is constituted by a bag body whose inside is sealed. One end of the heating hose 23 is connected to the tip of the steam hose 8 connected to the boiler 13 and the compressor 12, and the other end is connected to the air vent plug 33.

  Next, the pressurized water vapor is sent to the heating hose 23 through the steam hose 8, so that the heating hose 23 expands and comes into close contact with the inner surface of the lining material 2. Thereby, the lining material 2 is heated. In addition, by opening the air vent plug 33, the pressurized water vapor filled in the lining material 2 can be discharged. When the heating process is completed, air is extracted by the air vent plug 33, the heating hose 23 is contracted, and the main pipe 1 is pulled out.

  Next, the knob margins 24 and 25 of the lining material 2 described above will be specifically described.

  In general, in the construction method in which the lining material 2 is inserted into the existing pipe line and the lining material 2 is lined on the inner surface of the existing pipe line, the lining material 2 is usually the end of the main pipe 1 along the wall surfaces of the manholes 9 and 10. It is completely cut off at the section and finished with the existing pipe opening with an epoxy resin or the like so as to be in close contact with the existing pipe line. Therefore, when it becomes necessary to pull out the lining material 2 after construction, there is no gripping margin at the time of pulling out, which becomes an obstacle to the pulling process. Therefore, as shown in the first construction example and the second construction example, the lining material 2 is not completely cut at the end portion of the main pipe 1 at the time of construction, and a part of the lining material 2 is left in the future. For example, the method of pulling out the lining material 2 according to the present invention can be smoothly performed.

  Fig.8 (a) is the figure which showed embodiment which concerns on a 1st construction example in the manhole 9 in the sewer line as an example of an existing pipe line, and is an expanded cross-sectional view of the said sewer line. FIG.8 (b) is the figure which showed embodiment which concerns on a 2nd construction example in the manhole 9 in the sewer line as an example of an existing pipe line, and is an expanded cross-sectional view of the said sewer line. FIG. 9 is a schematic perspective view of the lining material 2 according to the first construction example.

(First construction example)
First, the first construction example will be described with reference to FIG. As shown in FIG. 8A, the manhole 9 is connected to the main pipe 1 on the inflow side and the main pipe 1 on the outflow side. Then, when the lining material 2 is lined on each main pipe 1, the lining material 2 is not completely cut at the end of the main pipe 1, but is cut while leaving the lower part. The lower part of the manhole 9 protrudes 20 cm or more into an invert 26 portion that is a semicircular groove having the same diameter as the main pipe 1 connected to the bottom of the manhole 9. A gap is formed between the main pipe 1 on the inflow side and the lower part of the lining material 2 protruding from the main pipe 1 on the outflow side to the manhole 9 side. Is buried. In the future, when the lining material 2 is pulled out, by removing the mortar 27, the lower part can be used as the knob 24. As a result, the lining material extraction process can be smoothly performed by using the knob allowance 24 as a starting point when the lining material 2 is extracted.

(Second construction example)
Next, a second construction example will be described with reference to FIG. As shown in FIG. 8B, the manhole 9 is connected to the main pipe 1 on the inflow side and the main pipe 1 on the outflow side. Then, when the lining material 2 is applied to the main pipe 1, the lining material 2 is not completely cut at the end of the main pipe 1, but is cut leaving the upper part and the lower part, and The portion is folded outside the main tube 1 along the inner surface of the manhole 9. Thereby, when pulling out the lining material 2, the upper part can be used as the knob allowance 25. Further, the lower part of the manhole 9 protrudes 20 cm or more into an invert 26 portion, which is a groove in which the bottom of the manhole 9 is finished in a semicircle with the same diameter as the main pipe 1 connected thereto. A gap is formed between the main pipe 1 on the inflow side and the lower part of the lining material 2 protruding from the main pipe 1 on the outflow side to the manhole 9 side. Is buried. In the future, when the lining material 2 is pulled out, by removing the mortar 27, the lower part can be used as the grip allowance 24. As a result, the lining material drawing process can be smoothly performed by using the knob allowances 24 and 25 for starting the lining material 2.

  FIG. 9 is an enlarged view of a portion 24 of the knob margin of the lining material 2 according to the first construction example. A through hole for the high-strength linear body 5 is formed in the pulling tab 24 provided in the lining material 2, and the high-strength linear body 5 is connected to the through-hole. Thus, by forming the knob allowance 24 in advance when the lining material 2 is lined on the existing pipe line, each process according to the first to third embodiments can be performed smoothly. .

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

It is the figure which showed embodiment at the time of implementing invention based on 1st Embodiment of this invention. It is the figure which showed the lining material extraction process which concerns on 1st Embodiment of this invention. It is the figure which showed the slit formation process which concerns on 1st Embodiment of this invention. FIG. 4A is a schematic perspective view of a cut jig. FIG. 4B is a schematic cross-sectional view taken along the line AA shown in FIG. It is the figure which showed embodiment at the time of implementing invention based on 2nd Embodiment of this invention. It is the figure which showed embodiment at the time of implementing invention which concerns on 3rd Embodiment of this invention. It is the figure which showed an example of the heating process which concerns on this invention. Fig.8 (a) is the figure which showed embodiment which concerns on a 1st construction example. FIG.8 (b) is the figure which showed embodiment which concerns on a 2nd construction example. It is a perspective schematic diagram of the lining material concerning the 1st construction example. It is a schematic perspective view which shows one Embodiment of a lining material.

Explanation of symbols

1 Main 1
2 Liner 3 Cut part 4 Slit 5 High-strength linear body 6 Cut jig 9, 10 Manholes 14, 14a, 14b Plug 16 Branch pipe 17 Branch pipe port 22 Torsion jig 24, 25

Claims (3)

A method for removing a lining material that is lined in an existing pipeline and has at least a resin material,
A slit forming step of inserting a slit along the longitudinal direction of the lining material,
A linear body locking step of locking a high-strength linear body in the vicinity of the slit portion of the lining material at an end in the longitudinal direction of the lining material;
By pulling the locked high-strength linear body, the liner material is pulled out from the existing pipeline while peeling the liner from the existing pipeline inner surface; and
A method for removing a lining material, comprising: A method for removing a lining material lined with an existing pipeline and having at least a thermoplastic resin material,
A heating step of heating the lining material;
A sealing step of hermetically sealing the longitudinal ends of the lining material and the branch pipe opening of the lining material;
Depressurizing the inside of the sealed lining material, and detaching the lining material from the existing pipe inner surface,
A lining material extraction step of extracting the peeled lining material from the existing pipe line;
A method for removing a lining material, comprising: A method for removing a lining material lined with an existing pipeline and having at least a thermoplastic resin material,
A heating step of heating the lining material;
Inserting a twist in the circumferential direction of the lining material from one end of the lining material, and detaching the lining material from the inner surface of the existing pipeline,
A lining material extraction step of extracting the peeled lining material from the existing pipe line;
A method for removing a lining material, comprising:

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