JP2023044193A - Repairing method of existing underground conduit for water channel - Google Patents

Abstract

To provide a repairing method of an existing underground conduit for water channel, the method being capable of reconstituting easily, safely, and inexpensively a new water channel with a new conduit 3 in which multiple connection pipes 5 are consecutively coupled in an existing underground conduit 2.SOLUTION: A repairing method of an existing underground conduit for water channel includes: inserting consecutively-added connection pipes 5 into the existing underground conduit 2 between two adjacent manholes 1 from each of them until both of front end parts of the consecutively-added connection pipes 5 reach the middle part; further pushing in or drawing out at least one of the consecutively-added connection pipes, causing an expanded connection guide mechanism 7 to guide the connection pipes, adjusting position displacement, and completing the connection; performing contraction/removal of the connection guide mechanism 7; and reconstituting a new water channel 4 with a new conduit 3.SELECTED DRAWING: Figure 2

Description

The present invention provides a new pipe in an existing buried pipe for a water channel, such as a sewage pipe or a drainage pipe, which is buried between separated manholes, reconstructs a new water channel, and repairs the existing buried pipe. This article relates to a method for repairing existing buried pipes.

Existing buried pipes such as sewage pipes between manholes and industrial drainage pipes deteriorate due to corrosion and require repair work. A continuous pipe lining that is inserted into an existing buried pipe, a close-fitting pipe lining that draws a reduced diameter liner pipe into an existing buried pipe and expands it so that it adheres to the inner surface of the pipe, and hardens after inserting a resin-impregnated tubular fiber into an existing buried pipe. On-site resin hardening pipe lining to form a liner pipe, and discontinuous pipe lining to make a liner pipe by inserting a short pipe into an existing buried pipe while joining it on-site have been developed. However, none of them have yet achieved an easy, safe, and inexpensive construction method.

For example, the discontinuous pipe lining is proposed as a repair method in which a lightweight and inexpensive PVC pipe is introduced from a manhole, the PVC pipe is added, and a new pipe is installed in the existing buried pipe for the forced-in water channel by using the added pipe. The realization of the construction method has been trial and error, but in many cases there is a distance of several tens of meters between manholes, and there are undulations and meandering points between them, and there are obstacles such as deposits and earth sand in the existing underground pipes. In some cases, it is difficult to push in and insert a long distance while replenishing. It is further difficult to use a PVC pipe with a relatively large diameter to prevent damage, and such a repair method has not yet become widespread.

On the other hand, if the PVC pipe is inserted from both manholes with a strong force (power), the insertion distance can be halved. Since there is almost always a positional deviation at the portion, it is not possible to connect the insertion front ends of the extension tube at the intermediate portion by simply pushing or pulling it.

While there is an urgent need to rehabilitate pipelines due to deterioration and corrosion of pipelines, financial problems have delayed pipeline rehabilitation, and this is one of the causes of collapse accidents on pipelines. Early realization of rehabilitation work is desired.

The present invention finds such a problem and solves it, and inserts a connecting pipe made of synthetic resin into the existing buried pipe from both lower parts of the spaced apart manholes toward the middle part thereof. In addition to inserting by pushing or pulling, the next connecting pipe is connected to this connecting pipe and inserted while replenishing. Even if the front ends are misaligned in the middle part of the existing buried pipe, simply by pushing or pulling them further, they are guided by the connecting guide mechanism expanded and formed into a connecting guide shape, and this misalignment is automatically guided and corrected. The insertion front ends of both extension connecting pipes can be connected at the intermediate part, and it is easy to reconstruct a new waterway in the existing buried pipe by connecting many of these connecting pipes in the existing buried pipe, making it safe and easy. An object of the present invention is to provide an epoch-making method for repairing existing buried pipes for water channels, which can be realized at a low cost.

The gist of the present invention will be described with reference to the accompanying drawings.

A method for repairing an existing buried pipe for a water channel by providing a new pipe 3 in an existing buried pipe 2 for a water channel buried between manholes 1 to reconstruct a new water channel 4, wherein the new pipe 3 is directly or A large number of synthetic resin connecting pipes 5 or a large number of synthetic resin connecting pipes 5 and a large number of synthetic resin connecting pipes 5 that are configured to connect the ends by pushing through the joint pipe 9 and extend the entire length by adding. Each connecting pipe 5 has a pipe diameter that can be inserted into the existing buried pipe 2, and is introduced from the manhole 1 and connected to the existing buried pipe 9 under the manhole 1. The length is set so that it can be inserted from the end opening 6 of the pipe 2, and the end opening 6 of the existing buried pipe 2 below the manhole 1 that is spaced apart from the middle of the existing buried pipe 2 The connecting pipe 5 is pushed or pulled into the existing buried pipe 2 toward the part, and the next connecting pipe 5 is connected to the connecting pipe 5 and inserted while adding to the existing buried pipe. The extension connecting pipe 5 inserted into the pipe 2 by pushing or pulling from both sides is inserted until the front ends of the extension connecting pipe 5 reach the intermediate portion of the existing buried pipe 2, and then the front ends of the insertion are pushed together or It has an expandable/contractible connection guide mechanism 7 that serves as a connection guide when drawing and connecting, and the insertion front end of the extension connection pipe 5 inserted into the existing buried pipe 2 by pushing or withdrawing from both sides. The parts are inserted until they reach the intermediate part in the existing buried pipe 2, and at least one of the extension connecting pipes 5 is pushed or pulled in to expand and form the connecting guide mechanism 7 into the connecting guide shape. By correcting the positional deviation between the insertion front end portions of the extension connecting pipe 5, both the insertion front end portions are connected at the intermediate portion in the existing buried pipe 2, and the connection guide mechanism 7 is operated. By shrinking or removing the new pipe 3 composed of the extension connecting pipe 5 to which a large number of the connecting pipes 5 are connected, the new water channel 4 is formed in the existing buried pipe 2. The present invention relates to a method for repairing an existing buried pipe for a waterway, characterized by reconstructing the waterway.

The connection guide mechanism 7 expands to hold it in the insertion front end of one of the replenishment connecting pipes 5 and tapers toward the other replenishment connecting pipe 5 . A method for repairing an existing buried pipe for a waterway according to claim 1, characterized in that the tapered guide portion 8 is configured to protrude and expand.

Further, when the insertion front end portions of the extension connecting pipe 5 inserted by pushing or withdrawing from both sides reach the intermediate portion in the existing buried pipe 2, the connecting guide mechanism 7 is operated to inflate, while holding it in the insertion front end portion of the extension connection pipe 5 of the other extension connection pipe 5, the tapered guide portion 8 of the connection guide shape tapered toward the insertion front end portion of the other extension connection pipe 5 is protruded and expanded. By further pushing or pulling at least one of the replenishment connecting pipes 5, it is guided by the connection guide mechanism 7 expanded and formed into the above-described connection guide shape, so that the insertion front end portions of the replenishment connecting pipes 5 are misaligned. 3. The method of repairing an existing buried pipe for a waterway according to claim 2, wherein the insertion front ends of both extension connecting pipes 5 are connected to each other while correcting the above, and then the connecting guide mechanism 7 is contracted and removed. It is related to

In addition, the joint pipe 9 for extension is pushed into the end of the connecting pipe 5 and connected, and the next connecting pipe 5 is pushed into and connected to the joint pipe 9, and is inserted or pulled into the existing buried pipe 2. By repeating this process, the extension connecting pipe 5 is formed in the existing buried pipe 2, and the insertion front end portion is inserted to the middle portion of the existing buried pipe 2. The method for repairing an existing buried pipe for a waterway according to any one of claims 1 to 3, characterized in that the joint pipe 9 is connected in advance to the insertion front end of the extension connecting pipe 5. be.

Also, the extension connecting pipe 5 inserted from both the end openings 6 of the existing buried pipe 2 at the bottom of the manhole 1 which is spaced apart is pulled in by a pull string 12 connected to the insertion proximal end side, and this The replenishment connecting pipe 5 is drawn and inserted toward the intermediate portion of the existing buried pipe 2, and the next replenishment connecting pipe 5 is connected to the insertion proximal end side connecting pipe 5 of the replenishment connecting pipe 5, and the above-mentioned is repeated while replenishing. By repeating the process of replacing the pull-in cord 12 with the connecting pipe 5 and pulling in the pull-in cord 12, the extension connecting pipe 5 is extended and pulled into the existing buried pipe 2 to an intermediate portion. The insertion front ends of the extension connecting pipes 5 drawn and inserted into the buried pipe 2 from both sides are brought to reach the intermediate portion in the existing buried pipe 2, and at least one of the extension connecting pipes 5 is drawn and inserted. The method for repairing an existing buried pipe for a waterway according to any one of claims 1 to 4, characterized in that the insertion front ends are pulled in and connected.

Since the present invention is constructed as described above, the connecting pipe made of synthetic resin is pushed or pulled into the existing buried pipe from both lower parts of the spaced apart manholes toward the middle part thereof and inserted into the existing buried pipe. In addition, since the next connecting pipe is connected to this connecting pipe and inserted while adding it, this insertion distance can be halved, and this insertion work becomes easy. Even if there is a misalignment in the middle part of the pipe, it is guided by the connecting guide mechanism that is expanded and formed into a connecting guide shape by simply pushing or pulling it further, and this misalignment is automatically guided and corrected, and the two extension connecting pipes are inserted. The front ends can be connected to each other at the intermediate part, and it is easy to reconstruct a new waterway in the existing buried pipe with a new pipe in which many of these connecting pipes are connected, and it can be realized safely and inexpensively. It will be a temporary repair method for existing buried pipes for waterways.

FIG. 2 is an explanatory exploded perspective view showing an extension connecting pipe formed by inserting the connecting pipe of the present embodiment into a new pipe by connecting ends of the connecting pipe via a joint pipe, extending the entire length, and inserting it into the existing buried pipe. A new pipe is formed by drawing and inserting the connecting pipe into the existing buried pipe while extending the entire length by connecting the ends of the connecting pipe from the manhole of the present embodiment to the existing buried pipe through a joint pipe. Fig. 1 is a schematic explanatory drawing 1 in the middle of one-sided retraction insertion, showing that repair is performed by A new pipe is formed by drawing and inserting the connecting pipe into the existing buried pipe while extending the entire length by connecting the ends of the connecting pipe from the manhole of the present embodiment to the existing buried pipe through a joint pipe. FIG. 2 is a schematic explanatory diagram 2 in the middle of retracting and inserting the other side after completion of retracting and inserting on one side, showing that the repair is performed by A new pipe is formed by drawing and inserting the connecting pipe into the existing buried pipe while extending the entire length by connecting the ends of the connecting pipe from the manhole of the present embodiment to the existing buried pipe through a joint pipe. FIG. 3 is a schematic explanatory diagram 3 at the time of completion of retraction and insertion of both sides, showing that repair is performed by A new pipe is formed by drawing and inserting the connecting pipe into the existing buried pipe while extending the entire length by connecting the ends of the connecting pipe from the manhole of the present embodiment to the existing buried pipe through a joint pipe. Fig. 4 is a schematic explanatory drawing 4 at the time of completion of the intermediate section connection and new waterway, showing that the waterway is to be repaired. At least one of the replenishment connecting pipes is inflated within the insertion front end so that the insertion front ends of the replenishment connecting pipes inserted from both sides into the existing buried pipe of this embodiment can be connected to each other at the intermediate portion in the existing buried pipe. By pulling in one or both of the replenishment connecting pipes by means of a connection guide mechanism expanded into a connection guide shape in , positional deviation is corrected, and the insertion front ends of both replenishment connecting pipes are connected to each other. FIG. 1 is an explanation procedure diagram 1 before inflation operation; FIG. 2 is an explanatory procedure diagram 2 at the time of expansion operation (of the coupling guide mechanism) showing the procedure of the present embodiment; FIG. 3 is an explanatory procedure diagram 3 in the middle of the pull-in connection at the intermediate portion showing the procedure of the present embodiment; FIG. 4 is an explanatory procedure diagram 4 at the time of completion of the pull-in connection at the intermediate portion showing the procedure of the present embodiment; FIG. 5 is an explanatory procedure diagram 5 at the time of contraction removal recovery (of the coupling guide mechanism) showing the procedure of the present embodiment.

Optimal embodiments of the present invention will be briefly described with reference to the drawings showing the operation of the present invention.

A large number of synthetic resin connecting pipes 5 are used, which are configured so that the end portions can be connected by pushing directly or through a joint pipe 9 (joint) and the overall length can be expanded and extended. Both the joint pipe 9 and the joint pipe 9 are set to have a pipe diameter that can be inserted into the existing buried pipe 2, and a length that can be introduced from the manhole 1 and inserted from the end opening 6 of the existing buried pipe 2 below the manhole 1. prepare.

Then, for example, from both of the end openings 6 of the existing buried pipe 2 below the manhole 1, which is separated by ten and several meters (for example, 40 meters), the connecting pipe 5 is extended toward the intermediate part of the existing buried pipe 2. The existing buried pipe 2 is inserted into the existing buried pipe 2, and the next connecting pipe 5 is pushed into the connecting pipe 5 via the joint pipe 9 (joint), for example, to form an extension connecting pipe 5. It is inserted by pushing it inward or by pulling, for example, the string 12 for withdrawal from the opposite side.

Then, when the insertion front ends of the extension connecting pipes 5 inserted into the existing buried pipe 2 from both sides reach the middle part of the existing buried pipe 2, the guide shape for connection can be obtained simply by further pushing or pulling further. The positional deviation between the insertion front ends of the replenishment connecting pipes 5 is automatically guided and corrected, and the insertion front ends of both the replenishment connecting pipes 5 are pushed and connected to each other. Or it will be pulled in and connected.

After that, by contracting or removing (retrieving) the connecting guide mechanism 7, a new pipe 3 composed of an extension connecting pipe 5 in which a large number of connecting pipes 5 are connected can be provided in the existing buried pipe 2. 3 can be easily reconstructed in the existing buried pipe 2.

Therefore, the new pipe 3 can be constructed in the existing buried pipe 2 by using the inexpensive and lightweight synthetic resin connecting pipe 5, and there is no need to dig up the existing buried pipe 2. The operation of pushing or pulling the connecting pipe 5 makes it easy to reconstruct the new waterway 4 safely and at a low cost, and furthermore, the operation of inserting it into the existing buried pipe 2 while adding to this push-in connection or pull-in connection. Since the work is carried out from both manholes 1, not only is the distance halved, but also because the distance is short, there are few effects such as meandering of pipes and obstacles due to deposits, making the work easier.

Moreover, in the present invention, when the insertion front ends of the extension connecting pipes 5 reach the intermediate portion in the existing buried pipe 2 (when they are in a close facing state), only one of them is pushed in or pulled out of the other. Then, it is guided by the connecting guide mechanism 7 expanded and formed into a connecting guide shape, and the misalignment between the insertion front ends of the extension connection pipes 5 is automatically guided and corrected, and the insertion front ends of both extension connection pipes 5 are guided and corrected. Since the parts are connected to each other, it is very easy and safe to reconstruct the new waterway 4 by the new pipe 3 in which many of the connecting pipes 5 are connected in the existing buried pipe 2.・It can be realized at a low cost.

A specific embodiment 1 of the present invention will be described with reference to the drawings.

A method of repairing an existing buried pipe 2 by providing a new pipe 3 in an existing buried pipe 2 for a water channel such as a sewage pipe or an industrial drainage pipe buried between manholes 1 and reconstructing a new water channel 4. A short connecting pipe 5 (for example, a commercially available PVC pipe) is inserted into this existing buried pipe 2 without excavating work, and the next connecting pipe 5 is attached to this connecting pipe 5, for example, a joint pipe 9 ( For example, it is inserted into the existing buried pipe 2 while forming an extension connecting pipe 5 in which a large number of connecting pipes 5 and joint pipes 9 are connected by pushing and connecting through a commercially available PVC pipe for joints). In this repairing method, a new waterway 4 is reconstructed by providing a new pipe 3 by means of the extension connecting pipe 5 in the existing buried pipe 2 .

Specifically, the new pipe 3 of the present embodiment has a large number of connecting pipes 5 made of synthetic resin, which are configured such that the end portions can be connected by simply pushing through the joint pipe 9 and the overall length can be extended by adding. (For example, a commercially available PVC pipe having a length of about 40 mm and a slightly smaller diameter than the pipe diameter of the existing buried pipe 2, and having a sealing material 13 provided at the connecting end, which can be connected in a sealed state simply by pushing and connecting) It is composed of a large number of synthetic resin joint pipes 9 (commercially available PVC pipes for joints). 2, and the length (about 40 mm) is set so that it can be introduced from this manhole 1 and inserted from the end opening 6 of the existing buried pipe 2 below this manhole 1. .

To explain further, the connecting pipe extends from both of the end openings 6 of the existing buried pipe 2, such as a sewer pipe below the manhole 1, for example about 40 meters apart, toward the middle of the existing buried pipe 2. 5 is inserted into this existing buried pipe 1, and the next connecting pipe 5 is connected to this connecting pipe 5 via a joint pipe 9 (joint) and inserted while adding to it.

Specifically, the joint pipe 9 for replenishment is pushed into and connected to the end of the connecting pipe 5, and the next connecting pipe 5 is pushed into and connected to this joint pipe 9 and inserted into the existing buried pipe 2, which is repeated. Then, the extension connecting pipe 5 is formed, and the insertion front end is arranged in the middle part of the existing buried pipe 2. One insertion front end of the extension connection pipe 5 arranged in the middle part is The joint pipe 9 is pushed and connected in advance.

Then, when the insertion front ends of the extension connecting pipes 5 inserted into the existing buried pipe 2 from both sides reach the middle part of the existing buried pipe 2, when they are brought closer to each other by, for example, about 30 mm, The connecting guide mechanism 7, which can be expanded and contracted as a connecting guide, is pulled in to its intermediate portion and expanded, and the extension connecting pipe 5 is further simply pushed or pulled in to expand and form the connecting guide shape. Guided by the guide mechanism 7, the misalignment between the insertion front ends of the replenishment connecting pipes 5 is corrected, and the insertion front ends of the two replenishment connecting pipes 5 are connected to each other.

After connecting the new pipe 3 by adding the connecting pipe 5 in the existing buried pipe 2 in this way, the connecting guide mechanism 7 is contracted and removed to recover the new water channel 4 by the new pipe 3. The existing buried pipe 2 is reconstructed and repaired.

To explain further, the connection guide mechanism 7 of this embodiment is held in the insertion front end portion of one of the replenishment connecting pipes 5 by expanding and tapering toward the inside of the other replenishment connecting pipe 5 . The tapered guide portion 8 of the shape of the guide for push-in connection, which is shaped like an ellipse, protrudes and expands.

Furthermore, the connecting guide mechanism 7 of this embodiment is designed to prevent the insertion front ends of the extension connecting pipes 5 inserted into the existing buried pipe 2 from both sides from reaching the middle portion of the existing buried pipe 2 . (When the ends reach a point where they face each other and approach each other), the introduction and recovery string 10 or the like is pulled in a contracted state to this intermediate portion, and air is introduced from the air introduction pipe 11 to cause the expansion operation, and one of the above-mentioned splicing connections is performed. The connection guide is held in the insertion front end portion of the pipe 5 and held in the intermediate portion of the existing buried pipe 2, and tapered toward the other extension connecting pipe 5. As a configuration in which the tapered guide portion 8 of the shape is formed to protrude and expand, the tapered guide portion 8 of the connection guide mechanism 7 expanded and formed into the connection guide shape is formed by simply pushing or pulling the extension connecting pipe 5 further. Even if the insertion front ends of the replenishment connecting pipes 5 are guided and misaligned, the guide is automatically corrected so that the insertion front ends of both replenishment connecting pipes 5 are connected to each other, and then this connecting guide. The mechanism 7 is contracted by the introduction and recovery string 10 to remove and recover.

In this embodiment, the connecting guide mechanism 7 employs a configuration in which the tapered guide portion 8 expands symmetrically when expanded, and the tapered guide portion 8 that expands and forms is made of rubber. However, we will adopt a material that is slippery and has good strength and durability. In addition, a lubricant is applied to the surface of the tapered guide portion 8 and the insertion front end portion of the extension connecting pipe 5 so that the push-in or pull-in connection can be performed more smoothly.

Further, the connecting guide mechanism 7 may be provided in advance at the end of one of the replenishment connecting pipes 5 and expanded. 10, after inserting the connecting pipes 5 into the existing buried pipe 2 from both sides to predetermined positions, they are retracted to the inserted front end positions in a contracted state, and then expanded when the inserted front ends are connected to each other at the intermediate part. By actuating and inflating, and further pushing or pulling one against the other, it is automatically guided to the tapered guide portion 8 of the connecting guide mechanism 7 expanded and formed into the connecting guide shape, The misalignment between the insertion front end portions of the extension connecting pipes 5 is guided and corrected so that the insertion front end portions of the two extension connection pipes 5 can be easily connected to each other.

As described above, air is introduced into and exhausted from the connecting guide mechanism 7 through the air introduction pipe 11 to expand and contract. is connected to an air supply device to introduce and exhaust air.

Further, the operation of inserting the replenishment connecting pipe 5 to a predetermined position, the operation of expanding and contracting the connecting pipe 5, the connecting operation of the intermediate portion, etc. are performed while monitoring images by a camera introduced and set inside the existing buried pipe 2. .

Further, in this embodiment, instead of sequentially pushing and inserting from both the end openings 6 of the existing buried pipe 2 at the bottom of the manhole 1 which is separated, the pipe is inserted from the end opening 6 on the opposite side. The retraction operation is performed sequentially to retract and insert.

That is, in this embodiment, the extension connecting pipe 5 is pulled from the opposite side by the pull-in string 12 connected to the insertion base end side of the extension connecting pipe 5 to draw the extension connecting pipe 5 to the intermediate portion of the existing buried pipe 2 respectively.

Specifically, the extension connecting pipe 5 is drawn and inserted toward the intermediate portion of the existing buried pipe 2, and the next connecting pipe 5 is inserted into the insertion base end side connecting pipe 5 of the extension connecting pipe 5. By connecting via 9 and further splicing, the pulling string 12 is replaced with the connecting pipe 5 again and pulling the pulling string 12 is repeated, thereby extending the spliced connecting pipe 5 and inside the existing buried pipe 2. It is designed to be pulled in and inserted up to the middle part of the .

Further, after the insertion front ends of the extension connecting pipes 5 pulled into the existing buried pipe 2 from both sides are brought to the intermediate part of the existing buried pipe 2, the connecting guide mechanism 7 is moved as described above. After inflating, at least one of the extension connecting pipes 5 is retracted and inserted in this manner to connect the front end portions of the insertion with each other.

To explain further, in this embodiment, a pull-in lid 16 is provided as a pull-in locking portion detachably locked to the insertion proximal end side opening of the connecting pipe 5 closest to the insertion proximal end of the extension connecting pipe 5 . , the end of the pull-in cord 12 (pull-in wire) is detachably locked inside the pull-in lid 16, and the pull-in cord 12 passes through the extension connecting pipe 5 to the existing buried pipe 2 on the opposite side. is pulled out from the end opening 6, guided to the outside of the manhole 1 via a pulley 15 for pull-in, and this pull-in cord 12 is wound up by a pull-in device 14 (for example, a pull-in winding device by a winding drive roller). By doing so, we are trying to draw in sequentially.

Therefore, the connection pipe 5 is added and pulled in by the pull-in string 12 while replacing the pull-in lid 16, and the spliced connection pipe 5 is pulled up to the intermediate part of the existing buried pipe 2 and inserted.

That is, the next connecting pipe 5 is further connected to the connecting pipe 5 on the insertion proximal end side of the connecting pipe 5 through the joint pipe 9, and the pulling string 12 is again attached to this connecting pipe 5. The draw-in cord 12 is also attached to the draw-in lid 16, and the draw-in device 14 is used to draw in the draw-in lid 16 again. By repeating this process, the extension connecting pipe 5 is extended and drawn up to the intermediate portion in the existing buried pipe 2 and inserted. .

It should be noted that the present invention is not limited to this embodiment, and the specific configuration of each component can be appropriately designed.

1 manhole 2 existing buried pipe 3 new pipe 4 new channel 5 connecting pipe/replenishment connecting pipe 6 end opening 7 guide mechanism for connection 8 tapered guide part 9 joint pipe
10 Introductory recovery string
11 Air inlet tube
12 Drawstring
13 Seal material
14 retraction device
15 retraction pulley
16 Draw-in lid

Claims (5)

A method for repairing an existing buried pipe for a water channel, wherein a new pipe is installed in an existing buried pipe for a water channel buried between manholes to reconstruct a new water channel,
The new pipe is a large number of synthetic resin connecting pipes or a large number of synthetic resin connecting pipes, which are configured such that the ends can be connected to each other by pushing in directly or via a joint pipe, and the overall length can be expanded and extended. and a large number of synthetic resin joint pipes,
Each of the connecting pipes has a pipe diameter that can be inserted into the existing buried pipe, and a length that allows it to be introduced from the manhole and inserted from the end opening of the existing buried pipe below the manhole,
The connecting pipe is pushed or pulled into the existing buried pipe from both of the end openings of the existing buried pipe below the spaced apart manhole toward the intermediate portion of the existing buried pipe, and this connection is performed. The next connecting pipe is connected to the pipe and inserted while adding to it,
The insertion front end portions of the extension connecting pipe inserted into the existing buried pipe by pushing or pulling them from both sides are inserted until they reach the middle portion in the existing buried pipe, and then the insertion front ends are pushed or pulled against each other. Equipped with an expandable and contractible connection guide mechanism that serves as a connection guide when connecting,
The front end portions of the extension connecting pipe inserted into the existing buried pipe by pushing or withdrawing from both sides are inserted until they reach the intermediate portion in the existing buried pipe, and at least one of the extension connecting pipes is pushed in. Alternatively, it is pulled in and guided by the connecting guide mechanism that is expanded into the connecting guide shape, and the misalignment between the insertion front ends of the extension connecting pipe is corrected, so that both the insertion front ends are buried in the existing structure. Connected at the middle part in the pipe,
Contracting or removing the connecting guide mechanism,
An existing burial for a water channel, characterized in that the new pipe consisting of the replenishment connecting pipe to which a large number of the connecting pipes are connected is provided in the existing buried pipe, and the new water channel is reconstructed in the existing buried pipe by the new pipe. Pipe repair method. The connection guide mechanism expands to hold it in the insertion front end portion of one of the replenishment connecting pipes and tapers toward the inside of the other replenishment connecting pipe. 2. The method of repairing an existing buried pipe for a waterway according to claim 1, wherein the is configured to protrude and expand. When the insertion front ends of the replenishment connecting pipes inserted by pushing or withdrawing from both of them reach the intermediate portion in the existing buried pipe, the guide mechanism for connection is operated to inflate, and one of the replenishment connecting pipes is operated. while holding it in the insertion front end portion of the other extension connecting pipe, forming the tapered guide portion of the connecting guide shape tapered toward the insertion front end portion of the other extension connecting pipe by protruding and expanding,
By further pushing or pulling at least one of the replenishment connecting pipes, it is guided by the connection guide mechanism expanded and formed into the connection guide shape, thereby correcting the positional deviation between the insertion front end portions of the replenishment connecting pipes. , connecting the insertion front ends of both extension connecting pipes,
3. The method of repairing an existing buried pipe for a waterway according to claim 2, wherein said connecting guide mechanism is then contracted and removed. The joint pipe for replenishment is pushed into the end of the connecting pipe, and the next connecting pipe is pushed into and connected to the joint pipe. The extension connecting pipe is formed in the buried pipe, and the insertion front end portion is inserted to the intermediate portion of the existing buried pipe. A method for repairing an existing buried pipe for a waterway according to any one of claims 1 to 3, characterized in that the pipes are connected. The replenishment connecting pipe, which is inserted from both of the end openings of the existing buried pipe below the spaced manhole, is pulled in by a pull string connected to the insertion proximal end side of the replenishment connecting pipe, and the replenishment connecting pipe is pulled into the existing pipe. While pulling and inserting the buried pipe toward the middle part, the next connecting pipe is connected to the insertion proximal end side connecting pipe of this connecting pipe, and while adding more, the pulling string is again attached to this connecting pipe and this drawing is performed. By repeating the pulling of the string, the extension connecting pipe is extended and pulled into the existing buried pipe to an intermediate portion,
The insertion front end portions of the replenishment connecting pipe drawn and inserted into the existing buried pipe from both sides are brought to reach the intermediate portion in the existing buried pipe, and at least one of the replenishment connection pipes is drawn in and inserted into the insertion front end portions. The method for repairing an existing buried pipe for a waterway according to any one of claims 1 to 4, wherein the pipe is pulled in and connected.

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