JP7182921B2 - PIPELINE REPAIR METHOD, PIPING SYSTEM, AND CONNECTION JOINT - Google Patents

Description

The present invention relates to a method for repairing a pipeline forming a drainage channel and a joint for connecting pipe members forming the pipeline.

BACKGROUND ART Conventionally, construction methods for forming a pipeline that forms a drainage channel by connecting a plurality of pipe members, joints for connecting pipe members, and the like have been provided. Here, when repairing a part of an existing pipeline, the end of the pipeline is fixed, and the distance between the ends of the pipeline is fixed, and a new pipe material is inserted from the axial direction. There are cases where construction is forced to be done in a situation called so-called hell plumbing where there is no money. Since there is no insertion allowance for the pipe material between the ends of the pipeline, which is such a hell pipe, it is difficult to connect by arranging an intermediate pipe material.

Patent Document 1 below discloses a method for repairing pipes in such a state of hell pipes. In the pipe repair method of Patent Document 1, it is said that the pipe material can be replaced while the pipe material is easily centered.

JP-A-5-52278

By the way, the pipe materials that make up the pipes include those made of shock-resistant materials such as vinyl chloride pipes, as well as porcelain pipes made of ceramic materials (e.g., high-ceramic pipes). There are also those made of materials that are vulnerable to impact and easily broken, such as pipes).

Here, when repairing a part of a pipeline, if a ceramic pipe is included in the pipe material forming the pipeline, in addition to the pipe material to be removed, the ceramic pipe that is not damaged during construction will be impacted and damaged. A problem was pointed out. In this way, construction of pipelines containing ceramic pipes is not only difficult due to the fact that it will become a hell pipe, but it is necessary to pay attention not to damage the existing ceramic pipes, which are vulnerable to impact, and measures are required. was

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pipeline repair method, a piping system, and an expansion joint capable of partially repairing a pipeline while suppressing damage to the remaining pipe material.

Here, when the inventors of the present invention examined the above-mentioned problem, the cause of the damage of the pipe material to be left was the work of removing the pipe joint (existing pipe joint) attached to the pipe material to be left. It was found that there is Specifically, when removing the pipe material to be removed and then removing the existing pipe fitting attached to the adjacent pipe material, in addition to factors such as the fragility of the adjacent pipe material, It has been considered that the adjacent pipe materials may be damaged due to the vibration and impact at that time. In addition, the inventors of the present invention conducted extensive research and found that damage to the existing pipes can be suppressed by replacing the pipes to be repaired while leaving the existing pipe joints intact.

The pipeline repair method of the present invention provided based on the above knowledge repairs a pipeline by replacing a pipe material to be removed, which forms a part of a pipeline formed by a plurality of pipe materials, with a new pipe material that is a new pipe material. A pipeline repair method that uses an expansion joint that includes a cylindrical main body and a slide part that is slidable in the axial direction of the main body, and the pipe material to be removed and the pipe to be removed a removal step of removing the pipe member to be removed while leaving the existing pipe joint connecting the pipe member adjacent to the pipe member; and after the removing step, attaching the expansion joint to at least one of the existing pipe joints. an expansion joint mounting step; a new pipe placement step of placing the new pipe in place of the pipe to be removed; and connecting the new pipe and the expansion joint by sliding the slide portion toward the new pipe. and a connecting step.

According to the pipeline repair method of the present invention, it is possible to replace the pipe material while leaving the existing pipe joint. As a result, the pipeline repair method of the present invention can reduce the cause of damage to the existing pipe material and suppress the occurrence of unnecessary pipe material replacement work.

In the pipeline repair method of the present invention, in the removing step, the pipe material to be removed is removed while leaving both of the existing pipe joints arranged at both ends of the pipe material to be removed, and the expansion joint is removed. In the attaching step, the expansion joints are attached to both of the existing pipe joints. It is desirable that the expansion joints are connected to both ends of the new pipe member by sliding the new pipe members.

According to the pipeline repair method of the present invention, it is possible to suitably replace the pipe material even in a so-called "hell pipe" state after a part of the pipe material has been removed. Further, according to the pipeline repair method of the present invention, it is possible to replace the pipe material while leaving the existing pipe joint. As a result, the pipeline repair method of the present invention can reduce the cause of damage to the existing pipe material and suppress the occurrence of unnecessary pipe material replacement work.

In the pipeline repair method of the present invention, the expansion joint is provided with one or a plurality of protrusions provided to protrude outward in the axial direction, and in the new pipe placement step, the new pipe is at least It may be positioned in contact with one of the protrusions.

According to the above-described configuration, the new pipe can be easily positioned on the pipeline in the operation of inserting and arranging the new pipe on the pipeline. As a result, the pipeline repair method of the present invention can reduce the workload required for positioning the pipe material.

In the pipeline repair method of the present invention, in the expansion joint mounting step, the expansion joint may be mounted on the existing pipe joint so that at least part of the projecting portion is positioned downward.

According to the above-described configuration, the new pipe can be easily positioned on the pipeline in the operation of inserting and arranging the new pipe on the pipeline. As a result, the pipeline repair method of the present invention can reduce the workload required for positioning the pipe material. Further, according to the above-described configuration, when the new pipe is inserted into the pipeline from above downward, the new pipe is positioned while being temporarily placed on the projecting portion, and the new pipe is held in the positioned state. It is possible to reduce the members and the work load for doing it.

The expansion joint of the present invention includes a tubular main body, a slide part that is slidable in the axial direction of the main body, and one or more protrusions that protrude outward in the axial direction. It is characterized by having

According to the expansion joint of the present invention, the new pipe can be easily positioned on the pipe at the position where the new pipe and the protruding portion come into contact with each other in the work of inserting and arranging the new pipe on the pipe. As a result, the pipeline repair method of the present invention can reduce the workload required for positioning the pipe material. Further, according to the expansion joint of the present invention, if the projecting portion is arranged downward when the new pipe is introduced into the pipeline from above downward, the new pipe is positioned while being temporarily placed on the projecting portion. , the member and work load for holding the new pipe in a positioned state can be reduced.

An expansion joint of the present invention is an expansion joint whose length in an axial direction can be expanded and contracted, and includes a cylindrical main body, a slide part that is slidable in the axial direction of the main body, and a slide part that is slidable in the axial direction. and a thick portion having one or a plurality of protruding portions protruding outward, and one end of the main body having a thickness larger than that of the other portion of the main body. is provided, and the slide portion is provided at the other end.

According to the expansion joint of the present invention, when connecting two dissimilar pipes, the pipe members can be connected in a good connection state.

In the expansion joint of the present invention, the thick portion is provided so as to be flush with the end surface of one end side of the body portion and to expand the end surface of the body portion radially outward. There may be.

According to the expansion joint of the present invention, when connecting two dissimilar pipes, it is possible to distribute the contact pressure and connect the pipe members in a good connection state.

A piping system of the present invention is a piping system in which a porcelain pipe made of a ceramic material is included in at least a part of a pipeline formed by a plurality of pipes, and the porcelain pipe and other pipes are connected to each other. The dissimilar pipe connection portion includes a pipe joint and an expansion joint, and the expansion joint slides in the axial direction of the main body portion and the main body portion. and a slide portion configured to be able to extend the length in the axial direction by sliding the slide portion outward in the axial direction with respect to the main body portion. In the pipe connection portion, the pipe joint is attached to the connection portion between the ceramic pipe material and the main body portion, and the slide portion is attached in the extended state to the connection portion between the main body portion and the other pipe material. It is characterized by having

According to the piping system of the present invention, it is possible to improve the connection state between the ceramic pipe material and the other pipe material at the heterogeneous pipe connection portion.

In the piping system of the present invention, dissimilar pipe connecting portions are provided on both sides of the other pipe member, and the slide portions in the extended state are attached to both ends of the other pipe member. preferable.

According to the above configuration, it is possible to improve the connection state between the ceramic pipe material and the other pipe material at the dissimilar pipe connection portion.

ADVANTAGE OF THE INVENTION According to this invention, the pipeline repair method, piping system, and expansion joint which can repair a part of pipeline can be provided, suppressing the damage of the remaining pipe material.

It is a schematic diagram which shows the existing pipeline containing a ceramic pipe. FIG. 2 is a cross-sectional view showing a coupling of the existing pipeline of FIG. 1; 1 shows an expansion joint according to an embodiment of the invention; (a) is a front view, and (b) is a side view. FIG. 4 is a side cross-sectional view showing the expansion joint of FIG. 3 ; (a) shows the unstretched state, and (b) shows the stretched state. FIG. 3 is a schematic diagram showing an existing pipeline including a pipe material to be repaired; FIG. 4 is a diagram showing a state after a removal step in the pipeline repair method of the present invention; It is a figure which shows the expansion joint connection process in the pipeline repair method of this invention. It is a figure which shows the new pipe material arrangement|positioning process in the pipeline construction method of this invention. FIG. 5 is a diagram showing a state after a connecting step in the pipeline repair method of the present invention; FIG. 4 is a diagram showing a heterogeneous pipe joint formed in a pipeline;

Hereinafter, a pipeline repair method and an expansion joint according to the present invention will be described with reference to the drawings. In the following description, the existing pipeline 1 will be described first, and then the expansion joint 30 and the pipeline repair method according to the embodiment of the present invention will be described.

As shown in FIG. 1, the pipeline 1 is formed by connecting a plurality of pipe members 10 to form a channel (drainage channel) for sewage, rainwater, and the like. The pipeline 1 has a portion where a plurality of pipe members 10 are connected via couplings 20 (pipe joints). The pipe line 1 may include not only the portion where the pipe member 10 is connected via the coupling 20, but also a drainage basin, an expansion joint, and the like (not shown).

The pipe member 10, the coupling 20, and an expansion joint 30, which will be described later, are connected so that their axes substantially coincide with each other, forming an axial direction X that coincides with each other (see FIG. 1). Therefore, in the following description, the axial direction of the pipe member 10, the coupling 20, and the expansion joint 30, which will be described later, may be simply referred to as the "axial direction X".

A tubular member 10 is a tubular member for forming the pipeline 1 . The "pipe material" includes a ceramic pipe 12 (ceramic pipe material) made of a ceramic material, a PVC pipe made of a vinyl chloride-based resinous material, a Hume pipe made of reinforced concrete, and the like. A ceramic pipe 12 is included in at least a part of the pipe material 10 forming the pipeline 1 . FIG. 1 shows part of a pipe line 1 in which a plurality of ceramic pipes 12 are interconnected via couplings 20 .

The coupling 20 (pipe joint) is a short cylindrical connecting member for connecting the pipe members 10 . As shown in FIG. 2, openings are formed on both sides of the coupling 20 in the axial direction X, and the openings are formed as receptacles 22, 22 into which other tubular members are inserted. In the vicinity of the sockets 22, 22 of the coupling 20, seal portions 26, 26, which are annular rubber rings, are provided. The seal portion 26 is fitted into a seal fitting portion 24 formed in the coupling 20 and attached to the inner peripheral surface of the coupling 20 .

In the pipe line 1, two ceramic pipes 12 (pipe members 10) are inserted into sockets 22, 22 of the coupling 20 so that their ends face each other (see FIG. 2). In other words, the coupling 20 is attached to the outer peripheral surface of the ceramic pipes 12 (pipe members 10) arranged adjacent to each other, and connects the two pottery pipes 12 (pipe members 10) arranged adjacent to each other. Seal portions 26, 26 are attached to the outer peripheral surface of the ceramic pipe 12 (pipe member 10) arranged adjacent to each other so as to be substantially in close contact with each other, and water is stopped at the connecting portion.

<About expansion joints>
The expansion joint 30 is used in the pipeline repair method of the present invention, which will be described in detail later. As shown in FIG. 3 , the expansion joint 30 has a tubular body portion 32 and a slide portion 36 that is separate from the body portion 32 . Further, as shown in FIG. 4A, the body portion 32 is provided with a thick portion 34 . Furthermore, as shown in FIGS. 3 and 4, the slide portion 36 is provided with a projecting portion 38, a handle 40, seal portions 42 and 44, and a stopper portion 46. As shown in FIGS.

In the following description, among both ends of the expansion joint 30 in the axial direction X, the end (one end) on the side where the thick portion 34 is provided is simply referred to as "base end 30a", and the other end is simply referred to as " The other end 30b" may be described for explanation.

The slide portion 36 is a short tubular member. The slide portion 36 is sized such that the inner diameter thereof substantially matches the outer diameter of the main body portion 32 . As shown in FIG. 3B, the slide portion 36 is attached to the other end 30b side of the body portion 32. As shown in FIG. The slide portion 36 is slidable in the axial direction X with respect to the body portion 32 .

The expansion joint 30 can expand and contract the length in the axial direction X by moving the sliding portion 36 in the axial direction X with respect to the main body portion 32 . Specifically, as shown in FIG. 4A, in a state (non-stretched state) in which the slide portion 36 is arranged on the base end 30a side of the main body portion 32, the length of the expansion joint 30 in the axial direction X is becomes L1. Further, as shown in FIG. 4B, the sliding portion 36 is slid to the outside in the axial direction X (toward the other end 30b) with respect to the main body portion 32 by a distance L2, so that the entire length of the expansion joint 30 is extended. In the stretched state (stretched state), the axial direction X of the expansion joint 30 has a length L3. In this manner, the expansion joint 30 can expand and contract the length in the axial direction X by displacing the slide portion 36 in the axial direction X with respect to the main body portion 32 .

A proximal end 30a side of the expansion joint 30 is a spigot 31a into which another pipe member 10, a joint, or the like is inserted. Further, the other end 30b side of the expansion joint 30 is a socket 31b into which another pipe member 10, a joint, etc. are inserted in the stretched state (see FIG. 8, etc.).

As shown in FIG. 4( a ), the thick portion 34 is provided on the base end 30 a (one end) side of the body portion 32 . The thick portion 34 is a portion made thicker than other portions of the body portion 32 . The thick portion 34 of the present embodiment forms a portion that is thicker than other portions of the main body portion 32 by fitting (fitting) the sleeve member 34a onto the proximal end 30a of the main body portion 32. Then, the base end 30a of the body portion 32 is provided so as to expand the outer peripheral surface thereof radially outward. Further, as shown in FIG. 4A, the sleeve member 34a is attached so as to be flush with the end surface of the proximal end 30a of the body portion 32. As shown in FIG. In other words, the thick portion 34 has a thickness T1 of the main body portion 32 and a thickness T2 of the sleeve member 34a that are doubled to enlarge the end face of the base end 30a of the main body portion 32, A thickness T3 is formed at the end face on the base end 30a side.

The thickness of the thick portion 34 and the end surface of the main body portion 32 on the base end 30a side will be described in more detail. The inner diameter D1 of the body portion 32 is set to substantially match the inner diameter D4 of the ceramic pipe 12 (see FIG. 10). On the other hand, the outer diameter D2 of the portion of the body portion 32 where the thick portion 34 is not provided is smaller than the outer diameter of the ceramic pipe 12 . The expansion joint 30 compensates for the thickness difference between the body portion 32 and the ceramic pipe 12 by providing the thick portion 34 . In other words, in the expansion joint 30, the outer diameter of the portion of the main body 32 where the thick portion 34 is provided is set to a size that substantially matches the outer diameter D5 of the ceramic pipe 12 ( See Figure 10). As a result, in the expansion joint 30 , in a state in which the body portion 32 is inserted into the socket 22 of the coupling 20 , the body portion 32 is aligned with the axis of the ceramic pipe 12 inserted into the other socket 22 of the coupling 20 . can be approximately matched.

Further, the expansion joint 30 can be arranged such that when the base end 30a of the body portion 32 is arranged adjacent to the ceramic pipe 12, the end surface of the body portion 32 and the end surface of the ceramic pipe 12 substantially coincide with each other. can. As a result, the expansion joint 30 can be expected to have the effect of suppressing uneven contact pressure and dispersing the contact pressure at the connecting portion between the body portion 32 and the ceramic pipe 12 .

Projection 38 is provided to facilitate positioning of tube 10 relative to expansion joint 30 . As shown in FIG. 3B, the protruding portion 38 is provided so as to protrude outward in the axial direction X from the other end 30b of the slide portion 36. As shown in FIG.

As shown in FIG. 3( a ), the expansion joint 30 of this embodiment is provided with three projecting portions 38 . More specifically, the expansion joint 30 of the present embodiment includes projections 38b and 38c provided on the side of the slide portion 36 and between the projections 38b and 38c in the circumferential direction of the slide portion 36. and a projecting portion 38a. Note that the expansion joint of the present invention is not limited to the one provided with three projections as in the present embodiment. For example, the expansion joint of the present invention may have two projections or four projections. Moreover, the protruding portions 38 are provided at predetermined intervals while being unevenly distributed in a part of the slide portion 36 in the circumferential direction. Specifically, in the state shown in FIG. 3A, a plurality of (three in this embodiment) protrusions 38 are unevenly distributed in the lower area, and are provided at predetermined intervals in the lower area. It is On the other hand, the projecting portion 38 is not provided in the area above the projecting portions 38b and 38c in FIG. 3(a). In other words, in the expansion joint 30, the area in which the projections 38 are arranged at predetermined intervals in the circumferential direction (area on the lower side in FIG. It has an area (area on the upper side in FIG. 3(a)) that is greatly separated in the circumferential direction.

The handle 40 is provided as a handle for sliding the slide portion 36 with respect to the main body portion 32 . As shown in FIG. 3A, the handle 40 is provided so as to face the outer peripheral surface of the slide portion 36 in the radial direction. In the expansion joint 30 , the slide portion 36 can be easily moved with respect to the main body portion 32 by gripping the handle 40 and performing a slide operation of the slide portion 36 .

As shown in FIG. 4 , the seal portions 42 and 44 are provided near both ends of the slide portion 36 in the axial direction X. As shown in FIG. The seal portions 42 and 44 are fitted into seal fitting portions 42 a and 44 a formed in the slide portion 36 and attached to the inner peripheral surface of the slide portion 36 . Of the two seal portions 42 and 44 , the seal portion 44 provided at the proximal end 30 a is water-blocking between the body portion 32 and the slide portion 36 . A seal portion 42 provided at the other end 30b can stop water between the slide portion 36 and the tubular member 10 inserted into the socket 31b.

The stopper portion 46 is provided to restrict the sliding range of the slide portion 36 with respect to the main body portion 32 . As shown in FIG. 4, the stopper portion 46 is composed of a contact portion 46a formed in a stepped shape on the outer peripheral surface of the body portion 32 and a convex portion 46b provided on the inner peripheral surface of the slide portion 36. . The stopper portion 46 restricts the movement of the slide portion 36 toward the other end 30b at the position where the convex portion 46b contacts the contact portion 46a. As a result, the expansion joint 30 prevents the slide portion 36 from coming off the body portion 32 .

<Regarding the pipeline repair method>
Next, a pipeline repair method according to an embodiment of the present invention will be described with reference to FIGS. 5 to 10. FIG.

As shown in FIG. 5, when a ceramic pipe 12 (pipe material 10) of an existing pipeline 1 includes a damaged portion K, the ceramic pipe 12 containing the damaged portion K is removed as a pipe material 10a to be removed. A case will be described in which the target pipe material 10a is removed and replaced with a new pipe material 10 (new pipe material 10c).

In the following description, the pipe members 10 arranged adjacent to both sides of the removal target pipe member 10a are described as adjacent pipe members 10b.

Both the pipe material 10 a to be removed and the adjacent pipe material 10 b are ceramic pipes 12 . In this embodiment, an example in which a PVC pipe 13 made of a vinyl chloride-based material is used as a new pipe member 10c arranged in place of the pipe member 10a to be removed will be described.

In the repair work to remove the pipe material 10a to be removed included in the existing pipeline 1 and place the new pipe material 10c, first, excavation work is performed to expose the pipe material to be removed 10a buried in the ground. In addition, in this specification, a detailed description of the excavation work is omitted.

<Removal process>
As shown in FIG. 5, the removal step is performed in a state in which the soil around the removal target pipe 10a is removed and the removal target pipe 10a is exposed. A method for removing the tube material 10a to be removed is not particularly limited. For example, a method of crushing the tube material 10a to be removed with a hammer or the like using the brittle nature of the ceramic tube 12 of the tube material 10a to be removed can be used.

In the removal step, the removal target pipe material 10a is removed while leaving the coupling 20 (pipe joint, existing pipe joint) connecting the removal target pipe material 10a and the adjacent pipe material 10b. Specifically, as shown in FIG. 6, the tube 10a to be removed is removed while maintaining the coupling 20 connecting the tube 10a to be removed and the adjacent tube 10b attached to the adjacent tube 10b.

As a result, it is possible to reduce the cause of damage to the ceramic pipe 12 (adjacent pipe material 10b) to be left, and suppress the need to replace the pipe material 10 more than necessary. In addition, in the pipeline 1 after repair work, the water stop structure by the seal portion 26 that stops water between the existing ceramic pipe 12 (pipe material 10) and the coupling 20 can be diverted.

<Expansion joint installation process>
As shown in FIG. 7, after the removal step, the expansion joint 30 is attached in the expansion joint attachment step. Specifically, the expansion joint 30 is fitted into the coupling 20 after the removal target pipe material 10a is removed. The expansion joint 30 is attached to the coupling 20 by inserting the spigot 31 a (base end 30 a ) into the socket 22 of the coupling 20 . When the expansion joint 30 is inserted into the coupling 20, the slide portion 36 is placed on the side of the proximal end 30a (unstretched state).

As shown in FIG. 8, when the expansion joint 30 is attached to the coupling 20, the main body portion 32 of the expansion joint 30 and the adjacent pipe member 10b are arranged so that their end faces face each other (see the enlarged view of FIG. 8). After the expansion joint mounting process, the seal portion 26 of the coupling 20 is attached to the outer peripheral surface of the body portion 32 of the expansion joint 30 . As a result, the connecting portion between the adjacent pipe member 10b and the main body portion 32 is water-stopped.

In the expansion joint mounting process, it is desirable to apply a lubricant to the spigot 31 a of the expansion joint 30 and the socket 22 of the coupling 20 . This allows the expansion joint 30 to be smoothly inserted into the coupling 20 . In addition, in the expansion joint mounting process, it is desirable that the expansion joint 30 is arranged such that the intermediate protrusion 38a of the three protrusions 38 is positioned downward.

As shown in FIG. 8, when the expansion joint 30 is attached to the coupling 20, the distance between the ends of the pipeline 1 (the distance between one expansion joint 30 and the other expansion joint 30) is L4. .

<New pipe material preparation process>
Next, prepare a new pipe member 10c having a length L4 corresponding to the distance between the ends of the pipeline 1 (the distance between one expansion joint 30 and the other expansion joint 30). As the new pipe material 10c, a pipe having a length that is standardized in advance may be used. It is also possible to fabricate the tube 10c. When the PVC pipe 13 made of vinyl chloride is used as the new pipe material 10c as in this embodiment, length adjustment by cutting or bonding is extremely easy.

It is desirable that the end face of the new tube member 10c be chamfered. Moreover, it is desirable to apply a lubricant to the end portion of the new pipe member 10c and the socket 31b of the expansion joint 30 . As a result, the new pipe member 10c and the expansion joint 30 can be connected smoothly.

<New pipe placement process>
Next, the new tube 10c is placed between the two expansion joints 30, as shown in FIGS. That is, the new pipe member 10c is placed instead of the removal target pipe member 10a. At this time, the end surface of the new pipe member 10c and the end surface of the main body portion 32 of the expansion joint 30 (the end surface on the side of the other end 30b) are brought into contact (see FIG. 10).

In addition, in the expansion joint installation step, if the protrusion 38a of the three protrusions 38 of the expansion joint 30 is arranged downward, the new pipe member 10c is directed downward from above to the pipeline 1. , the new tube member 10c can be easily positioned. Specifically, when the new pipe member 10c is caused to enter the pipeline 1 from above and is arranged downward, the new pipe member 10c is supported from below by the protrusions 38a, 38b, and 38c at the position where it contacts the protrusion 38a. and temporarily placed in the positioned state (see the enlarged view of FIG. 9). Further, the new pipe member 10c is positioned so as to substantially match the axis of the main body portion 32. As shown in FIG. In this way, in the operation of inserting and arranging the new pipe member 10c onto the pipeline 1, the new pipe member 10c can be easily positioned so as to coincide with the axis of the main body portion 32. FIG.

<Connection process>
Next, as shown in FIG. 9, in the connecting step, the slide portions 36 provided on the two expansion joints 30 are slid in the direction of approaching each other. As a result, the socket 31b of the expansion joint 30 is fitted to one end of the new pipe member 10c, and the socket 31b of the expansion joint 30 is fitted to the other end. In other words, the new pipe member 10c is fitted into the expansion joint 30 so as to be sandwiched from both sides in the axial direction X. As shown in FIG. Also, the seal portion 42 provided on the slide portion 36 is substantially in close contact with the outer peripheral surface of the new pipe member 10c, and the connecting portion between the new pipe member 10c and the main body portion 32 is connected in a watertight state.

After the above steps are completed, the excavated area is backfilled. Repair of the pipeline 1 is completed by the above steps.

As described above, according to the pipeline repair method of the present invention, after the pipe material 10a to be removed is removed, a new pipe material ( A new tube 10c) can be easily placed and connected. In addition, the connecting portion (heterogeneous pipe connecting portion 60) between the new pipe member 10c and the existing pipe member 10 (adjacent pipe member 10b) is replaced by the seal portion 26 of the coupling 20 attached to the existing pipe member 10 or the seal portion of the expansion joint 30. Water can be stopped by 42 and 44 . As described above, according to the pipeline repair method of the present invention, there is no need to perform water stoppage work using mortar or the like between the existing pipe material 10 and the new pipe material 10c, and the replacement work of the pipe material 10 can be simplified. can be done.

Next, the piping system 50, which is the pipeline 1 having the heterogeneous pipe joint 60, will be described. The piping system 50 is obtained, for example, after repairing the pipeline 1 by the pipeline repairing method described above.

As shown in FIG. 10 , a piping system 50 includes a ceramic pipe 12 in a pipeline 1 formed by a plurality of pipe members 10 . The piping system 50 also includes a dissimilar pipe connection portion 60, which is a portion where the ceramic pipe 12 and another pipe material 10 (the vinyl chloride pipe 13) are connected.

In the piping system 50 , the ceramic pipe 12 and the PVC pipe 13 are connected via the coupling 20 and the expansion joint 30 at the heterogeneous pipe connection portion 60 . At the dissimilar pipe connection portion 60, the main body portion 32 and the PVC pipe 13 are connected with the expansion joint 30 in an extended state.

The piping system 50 is provided with dissimilar pipe connections 60 on both sides of the PVC pipe 13 . 10 shows a dissimilar pipe connection portion 60 provided on one end side of the PVC pipe 13 (the right side of the PVC pipe 13 in FIG. 10), and a dissimilar pipe connection portion provided on the other end side of the PVC pipe 13. 60 is omitted from the drawing.

As shown in FIG. 10 , in the dissimilar pipe connection portion 60 , at the connection portion where the main body portion 32 of the expansion joint 30 and the ceramic pipe 12 are adjacent, the end face of the ceramic pipe 12 and the end face of the thick portion 34 are arranged so as to contact each other. It is The inner diameter D1 of the body portion 32 is set to substantially match the inner diameter D4 of the ceramic pipe 12 . Further, the expansion joint 30 is set such that the outer diameter D3 of the portion of the body portion 32 where the thick portion 34 is provided is substantially the same as the outer diameter D5 of the ceramic pipe 12 . As a result, in the dissimilar pipe connection portion 60, when the body portion 32 is inserted into the socket 22 of the coupling 20, the axis of the body portion 32 and the axis of the ceramic pipe 12 are arranged in a substantially aligned state. It is

In addition, in the dissimilar pipe connecting portion 60, the end face of the main body portion 32 and the end face of the ceramic pipe 12 are arranged so as to substantially coincide with each other. As a result, the piping system 50 can suppress bias in the contact pressure at the connecting portion between the main body 32 and the ceramic pipe 12 and distribute the contact pressure.

INDUSTRIAL APPLICATION This invention can be suitably employ|adopted as a joint used at the time of the repair work which repairs a part of pipeline, and repair work.

1 pipeline 10 pipe material 10a pipe material to be removed 10b adjacent pipe material 10c new pipe material 12 porcelain pipe (pipe material, porcelain pipe material)
13 PVC pipe (tubing material)
20 Coupling (pipe joint, existing pipe joint)
30 expansion joint 30a proximal end (one end)
30b other end 32 body portion 34 thick portion 36 sliding portion 38 projecting portion 38a projecting portion 38b projecting portion 38c projecting portion 50 piping system 60 dissimilar pipe connection portion X-axis direction

Claims (4)

A pipeline repairing method for repairing a pipeline by replacing a pipe material to be removed, which forms part of a pipeline formed by a plurality of pipe materials, with a new pipe material that is a new pipe material, comprising:
An expansion joint comprising a cylindrical main body and a sliding part that is slidable in the axial direction of the main body is used,
The pipeline inserts the pipe material to be removed into a first opening formed on one end side of the existing tubular pipe joint, and inserts the pipe material to be removed into a second opening formed on the other end side of the existing pipe joint. The pipe material to be removed and the pipe material adjacent to the pipe material to be removed are connected by inserting the pipe material adjacent to the target pipe material,
a removal step of removing the pipe material to be removed while maintaining the existing pipe joint attached to the pipe material adjacent to the pipe material to be removed;
an expansion joint attaching step of attaching the expansion joint to at least one of the existing pipe joints after the removing step;
a new pipe placement step of placing the new pipe in place of the pipe to be removed;
and a connecting step of sliding the slide portion toward the new pipe member to connect the new pipe member and the expansion joint. In the removing step, the pipe material to be removed is removed while leaving both of the existing pipe joints arranged at both ends of the pipe material to be removed,
In the expansion joint mounting step, the expansion joints are mounted on both of the existing pipe joints,
In the connecting step, the slide portions are attached to both ends of the new pipe, and the expansion joints are connected to both ends of the new pipe by sliding the two slide portions toward each other. The pipeline repair method according to claim 1. The expansion joint comprises one or more protrusions provided to protrude outward in the axial direction,
3. The pipeline repairing method according to claim 1, wherein, in said new pipe material arranging step, said new pipe material is positioned in contact with said at least one projecting portion. 4. The pipeline repair according to claim 3, wherein in the expansion joint mounting step, the expansion joint is mounted to the existing pipe joint so that at least part of the projecting portion is positioned downward. Method.

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