KR102417641B1 - Connection joint structure - Google Patents

Abstract

The present invention can easily combine the expansion and contraction pipe for firefighting and the multi pipe, the airtightness is improved through compression and fitting, and it can prevent the expansion and contraction pipe and the multi pipe combined with the connection joint by an external force in the future from being separated It relates to the connecting joint structure.
According to the present invention, since the cap surrounding the outside of the expansion and contraction pipe for fire protection and the multi-pipe can be firmly coupled with the main frame, and the main frame, the expansion and contraction pipe and the multi-pipe are coupled along the outer circumferential surface of the multi-pipe, airtightness can be improved through this have a significant effect.

Description

Connection joint structure {CONNECTION JOINT STRUCTURE}

The present invention can easily combine the expansion and contraction pipe for firefighting and the multi pipe, the airtightness is improved through compression and fitting, and can prevent the expansion and contraction pipe and the multi pipe combined with the connection joint by an external force in the future from being separated It relates to the connecting joint structure.

According to the present invention, since the cap surrounding the outside of the fire-fighting expansion and contraction pipe and the multi-pipe can be firmly coupled to the main frame, and the main frame, the expansion and contraction pipe and the multi-pipe are coupled along the outer circumferential surface of the multi-pipe, airtightness can be improved through this have a significant effect.

In general, the expansion and contraction piping is applied to a fire sprinkler, and in case of a fire, water is supplied to the internal space where the fire occurred.

A general pipe for water supply is provided in the indoor space and is connected to a new pipe connected to the sprinkler to supply water for fire fighting to the sprinkler.

At this time, the pipe for water supply can be used in various ways, but it must not be corroded even after long-term use, and a pipe having heat resistance is required so that water can be smoothly supplied even in the event of a fire.

However, since it is difficult to obtain various effects with a pipe made of a single material, a multifunctional multi-pipe made of multiple composite coating layers is used.

Conventionally, a thread is formed on the outer surface of the pipe, and the pipe is connected to each other through a pipe connector having fasteners on both sides that are screwed to the pipe threads on both sides and have packing interposed on both sides. In the case of multi-pipe made of CPVC, which is more popular than PVC for special industrial piping, there is an inconvenience that it is very difficult to form a thread on the outer surface.

Therefore, in order to connect the multi-pipe for water supply to the pre-installed expansion and contraction pipe, conventionally, the joint is connected by welding, but there is a concern that it will rupture due to the impact or spark of electricity during welding operation, and while performing the welding operation, It also has a problem that the initial installation cost and installation period are increased because it takes a lot of work time and effort.

In order to solve this problem, "Expansion piping for CPVC bonding of branch piping equipped with a fixing bracket moving device" is published in Patent Registration No. 10-1682920 as a technology related to a connection method with an expansion and contraction pipe rather than welding.

The prior document discloses that a reducing elbow is coupled and fixed, facilitates height adjustment of the sprinkler head, and prevents the reducing elbow from being pushed by a pipe during construction to maintain the sprinkler head perpendicular to the ground. It is a technology that includes an expansion and contraction pipe that has a fixing bracket and is installed between the branch pipe for the sprinkler and the reducing elbow for installing the sprinkler head to offset the stress generated by the convenience of piping work and the sprinkler pipe.

However, since the outside of the branch pipe (B) for sprinkler and the expansion and contraction pipe (A) are arranged so that they can communicate with each other, and the outside is coupled with the adapter (2), it is difficult to make an airtight connection between the connected pipes. There is a concern, and there is also a concern that it is vulnerable to an external force because it is not firmly coupled and fixed.

Republic of Korea Patent Publication No. 10-1682920 (2016.12.20. Announcement)

The present invention has been devised to solve the above problems, and the present invention can easily combine the expansion and contraction pipe for firefighting and the multi-pipe, the airtightness is improved through compression and fitting, and the expansion and contraction pipe combined with the connection joint by an external force later And it is an object of the present invention to provide a connection joint structure that can prevent the multi-pipe from being separated.

In addition, a connection joint that can improve airtightness through the fire-fighting expansion pipe and the cap surrounding the outside of the multi pipe can be firmly coupled with the main frame, and the main frame, and the expansion pipe and the multi pipe are coupled along the outer circumferential surface of the multi pipe. It is an object of the present invention to provide a structure.

In the connection joint structure for connecting the expansion and contraction pipe and the multi-pipe as a means for achieving the object of the present invention,

A coupling portion protruding in the shape of a thread is formed on the outer surfaces of both ends, and the inner side of the telescopic pipe and the multi-tube are fitted at both ends, respectively, and the main frame communicates with the telescopic pipe and the multi-tube inside, and at both ends of the main frame It has a cap and a semi-arc shape that is pressed after being fitted to the outer surface of the telescopic pipe and the multi-pipe, and is formed in a pair and combined along the central outer circumference of the main frame, the center of the main frame and the interpolation side of the cap It is composed of a fixed frame that is in close contact with the end to attach and fix the cap to the main frame, a depression recessed along the outer periphery is formed in the center of the main frame, and a depression recessed inwardly in the inner center of the fixed frame home; and a pair of spaced apart from each other, vertically protruding contact protrusions are formed in the center of the recessed groove, and when the fixing frame is coupled to the main frame, the contact protrusions are inserted into the recessed portion to be closely coupled.

In addition, an O-ring that is interpolated into the recessed bone of the coupling part is additionally provided, and when the expansion and contraction pipe and the multi pipe are respectively fitted into the coupling part, the O-ring is compressed and in close contact with the inner surface of the expansion pipe and the multi pipe Confidentiality is improved.

In addition, the close contact protrusion has an elastic restoring force, and is interpolated by narrowing the spaced apart space when interpolating the recessed part, and is closely coupled to the inner surface of the recessed part by the elastic restoring force after the interpolation.

In addition, the inner diameter of the cap corresponds to the outer diameter of the expansion and contraction pipe or the multi-tube to be coupled, and one end of the cap in the interpolation direction is formed with a close contact portion in which the inner diameter recessed inward to correspond to the outer diameter of the main frame is narrowed.

At this time, a vertically protruding edge is formed along the end of the contact part, and when the edge is coupled to the fixing frame, the edge is drawn into the recessed groove to be closely coupled with the inner surface of the recessed groove.

In addition, the fixing frame is provided on both sides of the recessed groove as the center, the coupling protrusion protruding in the inner direction of the fixing frame is formed, and the coupling hole is formed through the contact portion at a position corresponding to the coupling protrusion. And, when the fixing frame is coupled to the cap, the coupling protrusion is introduced into the coupling hole and coupled thereto.

In addition, fastening portions are formed at both ends of the fixed frame, and the fastening portion is formed with a first fastener vertically protruding from one end of the fixed frame and recessed to correspond to the shape of the first fastener at the other end of the fixed frame. It is composed of a second fastener, and when the fixing frame is combined, the first fastener formed in one fixing frame is interpolated and fitted into the second fastener formed in the other fixing frame.

In addition, the cap is formed through the side in the interpolation direction when combined with the main frame, and an identification hole is formed that can check the degree of interpolation of the expansion and contraction pipe or the multi-tube fitted to the inside.

The connection joint structure according to the present invention can easily combine the expansion and contraction pipe for fire fighting and the multi pipe, and the airtightness is improved through compression and fitting, and the expansion and contraction pipe and the multi pipe combined with the connection joint are separated by an external force later. It has a remarkable effect that can prevent

In addition, in the present invention, since the cap surrounding the outside of the fire-extending pipe and the multi-pipe can be firmly coupled to the main frame, and the main frame, and the expansion pipe and the multi-pipe are coupled along the outer circumferential surface of the multi pipe, airtightness can be improved through this. has a remarkable effect.

1 is an exploded perspective view showing a connection joint structure according to the present invention.
Figure 1a is a perspective view showing a coupling example of the connection joint structure according to the present invention.
Figure 2 is an exploded side view showing the connection joint structure according to the present invention.
3 is a side cross-sectional view showing an application example of the connection joint structure according to the present invention.
FIG. 4 is a partially enlarged view of FIG. 3A .
FIG. 5 is a partially enlarged view of FIG. 3B.
6 shows various embodiments of a cap according to the present invention.
7 shows various embodiments of a fixed frame according to the present invention.
8 is a partial enlarged view to show an example of coupling the corner and the recessed groove of the present invention.

Hereinafter, it will be described in detail with accompanying drawings so that those skilled in the art can easily implement the connection joint structure connecting the expansion and contraction pipe and the multi-pipe according to the present invention.

1 is an exploded perspective view of a connection joint structure according to the present invention, Figure 1a is a perspective view showing a coupling example of the connection joint structure according to the present invention, Figure 2 is an exploded side view of the connection joint structure according to the present invention 3 is a side cross-sectional view showing an application example of the connection joint structure according to the present invention, FIG. 4 is a partially enlarged view of FIG. 3 A, and FIG. 5 is a partially enlarged view of FIG. , FIG. 6 shows various embodiments of the cap according to the present invention, FIG. 7 shows various embodiments of the fixed frame according to the present invention, and FIG. 8 shows a coupling example of a corner and a recessed groove of the present invention It is shown in a partially enlarged view for

The expansion and contraction piping for fire fighting and the multi-pipe according to the present invention can be easily combined, the airtightness is improved through compression and fitting, and it is possible to prevent the expansion and contraction piping and the multi-pipe combined with the connection joint from being separated by an external force later It relates to a connection joint structure (1).

The connection joint structure 1 according to the present invention includes a main frame 100 , a cap 200 , and a fixed frame 300 .

Prior to the description, since there is no difference depending on the direction in which the expansion and contraction pipe 2 and the multi-pipe 3 are combined with the connection joint structure 1, for easy explanation of the specification, the expansion-contraction pipe 2 and the multi-pipe ( 3) is integrated into 'pipes' and explained in advance.

The main frame 100 has a cylindrical shape with both sides open and is coupled to pipes to be connected.

At both ends of the main frame 100, coupling portions 110 are formed by a predetermined length, respectively, and are fitted with the inside of the pipe.

The coupling part 110 is formed to protrude outwardly along the outer circumference of the main frame 100, and may be formed of a screw thread or may be formed to protrude in plurality along the outer circumference by being spaced apart at regular intervals.

When the pipes to be coupled to both ends of the main frame 100 are fitted, the coupling part 110 is closely attached to the inner surface of the pipe and the coupling part 110 can improve and maintain airtightness and coupling force.

On the other hand, the O-ring 111 may be provided by being fitted on the outer periphery into a space spaced apart between the coupling portions 110 .

The O-ring 111 has a ring shape corresponding to the outer circumference of the main frame 100 and is made of a material having elastic restoring force. Therefore, as shown in FIG. 5 , it is compressed by the pipe fitted along the coupling part 110 of the main frame 100 and can be in close contact with the inner surface of the pipe and the outer surface of the main frame 100 , thereby improving airtightness. It is possible to prevent leakage of the fire extinguishing water moving along the pipe and the inside of the main frame 100 .

On the other hand, although the O-ring 111 in close contact with the multi-pipe 3 is shown in FIG. 5, it is also in close contact with the inner surface of the expansion and contraction pipe 2 .

In the center of the main frame 100 , a depression 120 that is uniformly depressed toward the inner surface is formed.

The recessed part 120 is a space provided inside in which the close contact protrusion 310 of the fixing frame 300 to be described later is recessed, and the fixing frame 300 coupled with the cap 200 is firmly attached to the main frame 100 . It is closely coupled to improve the fixing force.

The outer periphery of both sides of the recessed portion 120 is closely coupled to the end of the cap 200 in the insertion direction, which will be described in detail below.

The cap 200 serves to protect the coupling portion of the pipe coupled to the main frame 100 from the outside, and to further compress the pipes coupled to the main frame 100 to improve airtightness and coupling force.

The cap 200 has a cylindrical shape with both sides open, and is formed as a pair and is respectively coupled to the outside of the pipe coupled to both sides of the main frame 100 , and the inner diameter corresponds to the outer diameter of the pipe to which it is coupled, and the coupling part 110 ) so that it can be extended enough to cover the outside in order to protect the coupling position of the pipe fitted with the inside inside.

Among the ends of the cap 200, one end adjacent to the recessed part 120 is recessed inwardly at one end of the cap 200, so that the outer surface of the main frame 100, that is, the coupling part 110 and the recessed part 120, is spaced apart from each other. A contact portion 210 that is in close contact with the space is formed.

The contact portion 210 is formed at one end of the cap 200 , and has an inner diameter smaller than the inner diameter of the cap 200 so as to be in close contact with the outer periphery of the main frame 100 .

The cap 200 has an inner diameter corresponding to the outer diameter of the pipe fitted to the coupling part 110 , and the close contact part 210 is interpolated and adjacent to the recessed part 120 located in the center of the main frame 100 . By being formed, the main frame 100 and the cap 200 are directly in close contact with each other to be fixed, and the contact portion 210 is also coupled to the fixed frame 300 to improve the fixing force and airtightness.

In addition, by inserting the cap 200 at both ends of the main frame 100 and inserting the pipe, the end of the pipe is inserted only to the place where the close contact part 210 is formed, so that the pipe can be sufficiently introduced when connecting. It can serve as a guide.

When the pipe to be coupled to the main frame 100 is introduced into the inside through the cap 200, the cap 200 can be compressed with a press to improve airtightness later, so that it can be coupled without leakage even after long-term use.

The cap 200 having such a configuration improves the airtightness of the expansion and contraction pipe 2 or the multi pipe 3 by enclosing the outer surface when the expansion and contraction pipe 2 or the multi pipe 3 is combined with the main frame 100, thereby improving the airtightness of the expansion pipe 2 or the multi pipe 3 and can protect the expansion and contraction piping (2) or multi-pipe (3) from the outside, and through combination with the fixed frame (300), the main frame (100), the expansion-construction pipe (2) and the multi-pipe (3) It is possible to further improve the binding force with the

On the other hand, the cap 200 is coupled to the main frame 100 first, and the expansion and contraction pipe 2 or the multi pipe 3 is fitted into the separation space generated between the main frame 100 and the cap 200 inside. can be

However, since the cap 200 is an opaque material, the expansion and contraction pipe 2 or the multi-pipe 3 may not be sufficiently fitted with the coupling part 110 of the main frame 100 .

That is, since it is not possible to check the degree of interpolation of the expansion and contraction pipe 2 or the multi pipe 3 from the outside, if only a part is fitted to the outer peripheral surface of the coupling part 110 or is not fitted at all, water leakage occurs, as well as external forces. Fear of fire extinguishing because the expansion and contraction pipe (2) or multi pipe (3) is easily separated from the main frame (100) and the fire extinguishing drainage leaks to the outside exists

Accordingly, the cap 200 of the present invention may form an identification hole 220 through which the inside is confirmed by penetrating the inside from the outside in the vicinity of the contact part 210 .

That is, the pipe is inserted into the cap 200 coupled to the main frame 100 so that the main frame 100 and the pipe are fitted. It is wrongly determined that the cap 200 is sufficiently interpolated, so that the end of the pipe is not sufficiently interpolated toward the close contact portion 210 , and the operation may be finished or the cap 200 may be compressed.

In this case, the pipe coupled by an external force can be easily bent or pulled out, and the risk of leaking fire water inside also increases, so there is a need to sufficiently interpolate the pipe to be fitted.

Therefore, by inserting the pipe into the cap 200, it is possible to check the degree of entry of the pipe from the outside through the identification hole 220 when the main frame 100 and the fitting are coupled, and to proceed with the compression operation after the pipe is sufficiently drawn in. This allows the piping to be connected and installed with high perfection.

Meanwhile, the cap 200 may be manufactured in various embodiments together with the fixed frame 300 , which will be described in detail below.

The fixed frame 300 is coupled along the central outer surface of the main frame 100 to which the cap 200 is coupled to both ends, and is provided in the center of the main frame 100 and includes a cap including the center of the main frame 100 ( 200), that is, it is also coupled with one end at which the close contact portion 210 is located, so that the airtightness can be improved by firmly attaching one end of the cap 200 to the main frame 100, and is later separated by an external force. It can also be prevented.

This fixed frame 300 is made of a pair (300a, 300b) having a semi-arc shape, the pair of fixed frames (300a, 300b) has both ends coupled to the central outer circumference of the main frame 100 when combined. The inner diameter of the combined fixed frame 300 is formed to be the same as the central outer diameter of the main frame 100 .

The fixing frame 300 is recessed along the inner center of the fixing protrusion 310 and the fixing frame 300 that is drawn into and in close contact with the recessed portion 120 of the main frame 100, and is recessed at the center of the recessed portion. and a recessed groove 320 in which a contact protrusion 310 protruding to the opposite side is formed.

The close contact protrusions 310 are provided along the center of the inner surface of the fixed frame 300 , are formed to protrude vertically from the inner center of the fixed frame 300 , and are provided as a pair and spaced apart from each other, and the main frame 100 . It is interpolated into the depression 120 when combined with.

At this time, the locking projections 311 vertically protruding from the ends of the pair of contact protrusions 310 to the side where the caps 200 are located may be additionally formed. When the contact protrusion 310 is inserted into the depression 120 , the locking projection 311 is in close contact with the inner surface of the depression 120 and fixedly coupled thereto.

In addition, the close contact protrusion 310 has an elastic restoring force, so when the end side of the close contact protrusion 310 including the locking protrusion 311 is interpolated into the depression 120, the user narrows the space between the close contact protrusions 310 and collapses. In order to be easily interpolated into the part 120, and after being combined as shown in FIG. 4, the pair of contact protrusions 310 by elastic restoring force are in close contact with the inner surface of the recessed part 120 in the combined direction. is maintained and the holding force is improved.

A close contact protrusion 310 is provided at the center of the depressed inner side of the recessed groove 320 , and both sides around the recessed groove 320 , that is, the inner edge of the fixing frame 300 , are attached to the close contact portion 210 of the cap 200 . It is closely coupled to the outer surface.

Therefore, by directly bonding one end of the cap 200 coupled with the main frame 100 and the center of the main frame 100, fixing force and coupling force can be improved, and the cap 200 coupled with the main frame 100 can be improved. By protecting one end of the from the outside, it is possible to prevent the cap 200 from being easily separated from the main frame 100 .

The connection joint structure (1) made as described above improves the coupling force between each component constituting the connection joint structure (1), and the expansion and contraction pipe (2) and the multi-pipe (3) connected through the connection joint structure (1) ) is also firmly coupled to prevent leakage by improving airtightness, and it is also possible to prevent the expansion and contraction pipe (2) or multi-pipe (3) from deviated from the coupling position from external force.

On the other hand, in order to improve the airtightness and coupling force of the connection joint structure (1), various configurations may be additionally configured in the cap 200 and the fixed frame 300 .

Various embodiments as described above will be described with reference to FIGS. 6 to 8 . 6 is a perspective view and a side view of various embodiments of the cap 200 , and FIG. 7 shows various embodiments of the fixed frame 300 . At this time, FIG. 7 shows only one of the fixed frames 300 made of a pair, and one fixed frame 300 and the other fixed frame 300 shown in FIG. It is rotated to indicate in advance that it is merged.

First, in Fig. 6 (a), as described above, a close contact portion 210 having a narrow inner diameter is formed at one end of the cap 200. At this time, the contact portion 210 is on the outer peripheral surface of the central portion of the main frame 100. The inner diameter of the close contact portion 210 is formed to be the same as the outer diameter of the main frame 100 so as to be in close contact.

On the other hand, as shown in (b) of FIG. 6 , at the end of the close contact portion 210 , that is, at the end of the cap 200 adjacent to the recessed portion 120 when combined with the main frame 100 , the contact portion 210 is vertically outside from the end. A corner 211 protruding in the direction is formed along the end circumference of the contact portion 210 .

The edge 211 has a curved shape and protrudes outward from the side as the outer diameter gradually expands toward the distal side of the contact part 210 as shown in the side view of FIG. When the cap 200 and the fixed frame 300 are combined in the same form, the edge 211 is drawn into the recessed groove 320 of the fixed frame 300 and caught, thereby further improving the coupling force.

In addition, in addition to the corner 211, in order to improve the bonding force between the fixed frame 300 and the cap 200, the inner side of the fixed frame 300, that is, the portion in contact with the contact portion 210 of the cap 200 is on the inside. A coupling protrusion 330 protruding in the vertical direction is formed (refer to (b) of FIG. 7), and the coupling protrusion 330 is interpolated to the inside in the contact portion 210 corresponding to the coupling protrusion 330. A through-formed coupling hole 230 is formed (refer to (c) of FIG. 6).

Therefore, when the fixing frame 300 is coupled and installed to the outside of the cap 200 , the coupling protrusion 330 of the fixing frame 300 is interpolated into the coupling hole 230 of the cap 200 , and the cap 200 and It improves the coupling force between the fixing frames 300 , and may also serve to guide the position of the fixing frame 300 during coupling.

At this time, the coupling hole 230 is formed along the outer surface of the contact part 210 rather than being depressed to a size corresponding to the coupling protrusion 330, so that the coupling protrusion 330 can be interpolated in various directions. .

In addition, fastening portions 340 may be additionally formed at both ends of the fixed frame 300 in order to improve the coupling force between the pair of fixed frames 300 .

The fastening part 340 has a first fastener 341 vertically protruding from one end of the fixed frame 300 and a shape corresponding to the shape of the first fastener 341 at the other end of the fixed frame 300 . It consists of a vertically recessed second fastener 342 .

This fastening part 340 is the first fastener 341 formed at one end of one fixed frame 300 when the pair of fixed frames 300 are combined with each other, the other end of the other fixed frame 300 . The second fastener 342 formed in the second fastener 342 is interpolated and fitted, and the other side is also similarly formed at the other end of the one fixed frame 300 with the second fastener 342 formed at the other end of the fixed frame 300 at one end. The formed first fastener 341 is interpolated and fitted.

Accordingly, through the fastening part 340, the pair of fixed frames 300 along the outer perimeter of the main frame 100 and the cap 200 serve to improve the fixing force so that the combined state can be maintained and At the same time, it can also serve as a guide to help the fixing frame 300 come together.

As described above, the coupling force between the cap 200 and the fixed frame 300 can be further improved through various embodiments of the cap 200 and the fixed frame 300 , and the fixed frame 300 also maintains the combined state for a long time. It is possible to improve the bonding force so that the connection joint structure (1) can improve the bonding strength between the components, so that it does not deviate from the initial assembly form even under an external force, and has the effect of maintaining airtightness.

On the other hand, what has been described using FIGS. 1 to 8 above describes only the main points of the present invention, and as many designs are possible within the technical scope, the present invention is not limited to the configuration of FIGS. 1 to 8 is self-evident

1: Connection joint structure 2: Expansion piping
3: Multi tube
100: main frame 110: coupling part
111: O-ring 120: depression
200: cap 210: contact portion
211: corner 220: identification hole
230: coupling hole 300, 300a, 300b: fixed frame
310: close contact protrusion 311: locking jaw
320: recessed groove 330: engaging projection
340: fastening portion 341: first fastener
342: second fastener

Claims (8)

In the connection joint structure connecting the expansion and contraction pipe and the multi pipe,
a main frame in which coupling portions protruding in a screw thread shape are formed on the outer surfaces of both ends, and the inner sides of the expansion and contraction pipes and the multi-pipes are fitted at both ends, respectively, so that the inside of the expansion and contraction pipes and the multi-pipes communicate with each other;
Caps compressed after being fitted to the outer surfaces of the expansion and contraction pipe and the multi pipe fitted to both ends of the main frame, respectively; and
a fixed frame having a semi-arc shape, formed as a pair and joined along the outer periphery of the main frame, in close contact with the center of the main frame and the end of the cap in the interpolation direction to attach and fix the cap to the main frame; is composed of
A depression is formed in the center of the main frame along the outer circumference,
a recessed groove recessed inwardly in the inner center of the fixing frame; and a pair of contact protrusions spaced apart from each other and vertically protruding at the center of the recessed groove; is formed,
When the fixed frame is coupled to the main frame, the close contact protrusion is inserted into the recessed portion to be closely coupled,
The inner diameter of the cap corresponds to the outer diameter of the telescopic pipe or the multi-pipe to which it is coupled,
At one end of the cap in the interpolation direction, a contact portion with a narrow inner diameter recessed inward corresponding to the outer diameter of the main frame is formed,
The fixing frame is provided on both sides with the recessed groove as the center, and coupling protrusions protruding in the inside direction of the fixing frame are formed,
The coupling hole is formed through the contact portion at a position corresponding to the coupling protrusion,
Connection joint structure, characterized in that when the fixing frame is coupled to the cap, the coupling protrusion is introduced into the coupling hole and coupled thereto.
According to claim 1,
An O-ring interpolated into the recessed bone of the coupling part; is additionally provided,
Connection joint structure, characterized in that when the expansion and contraction pipe and the multi-pipe are respectively fitted into the coupling portion, the O-ring is compressed to be in close contact with the inner surface of the expansion and contraction pipe and the multi-pipe.
According to claim 1,
The contact protrusion has an elastic restoring force,
When interpolating the recessed part, the spaced apart space is narrowed and interpolated, and after interpolation, the connection joint structure is characterized in that it is closely coupled to the inner surface of the recessed part by an elastic restoring force.
delete According to claim 1,
A corner vertically protruding outward along the end of the contact part; is formed,
When the corner is coupled to the fixing frame, the connection joint structure, characterized in that it is drawn into the recessed groove and closely coupled to the inner surface of the recessed groove.
delete According to claim 1,
Fastening portions are formed at both ends of the fixed frame,
The fastening portion includes: a first fastener vertically protruding from one end of the fixing frame; and a second fastener recessed to correspond to the shape of the first fastener at the other end of the fixed frame; and
Connection joint structure, characterized in that the first fastener formed in one fixed frame is interpolated and fitted into the second fastener formed in the other fixed frame when the fixed frames are combined.
According to claim 1,
The cap is
A connection joint structure, characterized in that it is formed with an identification hole that is formed through the side in the interpolation direction when combined with the main frame, and that can confirm the degree of interpolation of the expansion and contraction pipe or multi-pipe that is fitted inside.

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