JP7793124B2 - Repair method for existing buried pipes for waterways - Google Patents

Description

The present invention relates to a method for repairing existing buried pipes for waterways, such as sewer pipes and drainage pipes, which are buried between spaced manholes. This involves installing a new pipe inside the existing buried pipe to reconstruct a new waterway, and then repairing the existing buried pipe.

Existing buried pipes, such as sewer pipes between manholes and industrial drainage pipes, deteriorate due to corrosion and other factors, requiring repair work. According to the ISO classification of pipe rehabilitation methods, various methods have been developed, including continuous pipe lining, in which a liner pipe of a specified length is inserted into the existing buried pipe; tight pipe lining, in which a reduced-diameter liner pipe is pulled into the existing buried pipe and expanded to fit tightly against the pipe's inner surface; in-situ resin-curing pipe lining, in which resin-impregnated tubular fibers are inserted into the existing buried pipe and then cured to form the liner; and discontinuous pipe lining, in which short pieces of pipe are joined on-site and inserted into the existing buried pipe to form the liner. However, none of these methods have yet been developed into a simple, safe, and inexpensive method.

For example, the discontinuous pipe lining technique has been proposed as a repair method in which lightweight, inexpensive PVC pipes are introduced through manholes, and these PVC pipes are then extended to install new pipes inside existing buried pipes used as push-in channels. Trial and error efforts have been made to realize this method, but in reality, the manholes are often several tens of meters apart, and there are often uneven or meandering sections between them, and there may be residual obstructions such as sediment or earth and sand inside the existing buried pipes. Therefore, it is difficult to actually push and insert pipes long distances while extending them. Furthermore, because these are waterway pipes for sewerage or industrial drainage, the PVC pipes must be relatively large in diameter so as not to reduce the size of the pipe, making this repair method even more difficult.

On the other hand, if PVC pipes are inserted using strong force (power) while being extended from both manholes, the insertion distance can be halved, and even if this power can be used to insert the pipe up to the middle of the existing buried pipe, there will almost always be misalignment in the middle, so the front ends of the extension pipes in this middle section cannot be connected by simply pushing or pulling them in.

While there is an urgent need to rehabilitate aging and corroded pipelines, financial issues have prevented the pipelines from being rehabilitated in time, which is one of the causes of pipeline collapses. There is a desire for safe and affordable rehabilitation work to be carried out as soon as possible.

The present invention aims to identify and solve these problems. It involves inserting synthetic resin connecting pipes into an existing buried pipe by pushing or pulling them into the existing buried pipe from both ends of spaced-apart manholes toward its midpoint. The next connecting pipe is then connected to the connecting pipe and inserted as it is extended. This halves the insertion distance, facilitating the insertion process. Even if the front ends of the extension connecting pipes become misaligned midway through the existing buried pipe, simply pushing or pulling them in further automatically corrects the misalignment by guiding them through a connecting guide mechanism that has been expanded into a connecting guide shape. This allows the front ends of the extension connecting pipes to be connected midway. This innovative method for repairing existing buried pipes for waterways makes it easy, safe, and inexpensive to reconstruct a new waterway within the existing buried pipe using a new pipe with multiple connecting pipes connected to it.

The gist of the present invention will be explained with reference to the attached drawings.

A method for repairing existing buried pipes for waterways, in which a new pipe 3 is provided in an existing buried pipe 2 for a waterway buried between manholes 1 to reconstruct a new waterway 4, wherein the new pipe 3 is configured to be a large number of synthetic resin connecting pipes 5, each of which is configured so that the ends can be connected together by pushing it in directly or via a joint pipe 9, and the entire length can be extended by adding on a new pipe 4, or the new pipe 3 is configured to be a large number of synthetic resin connecting pipes 5 and a large number of synthetic resin joint pipes 9, and each of the connecting pipes 5 has a pipe diameter that can be inserted into the existing buried pipe 2, and is configured so that the new pipe 3 can be inserted into the manhole 1, and the new pipe 3 is configured so that the end portions can be connected together by pushing it in directly or via a joint pipe 9, and the entire length can be extended by adding on a new pipe 4. The connecting pipe 5 is set to a length that can be introduced from the manhole 1 and inserted through the end opening 6 of the existing buried pipe 2 below the manhole 1, and the connecting pipe 5 is inserted into the existing buried pipe 2 by pushing or pulling it in from both of the end openings 6 of the existing buried pipe 2 below the manhole 1 that are spaced apart toward the middle of the existing buried pipe 2, and the next connecting pipe 5 is connected to this connecting pipe 5 and inserted while adding to it, and the front insertion ends of the extension connecting pipes 5 that have been pushed or pulled in from both sides are inserted into the existing buried pipe 2 until they reach the middle of the existing buried pipe 2, and at least one of the extension connecting pipes 5 is pushed or pulled in to act as a connecting guide. the connecting guide mechanism 7 is expanded and formed into a shape such that the connecting pipes 5 are guided by the connecting guide mechanism 7, which has been expanded and formed into a shape such that the misalignment between the insertion front ends of the extension connecting pipes 5 is corrected, and both insertion front ends are connected at an intermediate portion within the existing buried pipe 2; the connecting guide mechanism 7 is contracted or removed; the new pipe 3 consisting of the extension connecting pipes 5 to which a large number of the connecting pipes 5 are connected is provided within the existing buried pipe 2; and the new waterway 4 made of this new pipe 3 is reconstructed within the existing buried pipe 2.

The method for repairing existing buried pipes for waterways described in claim 1 is characterized in that the connecting guide mechanism 7 is held within the insertion front end of one of the extension connecting pipes 5 by expanding, and a tapered guide portion 8 of a connecting guide shape that tapers toward the inside of the other extension connecting pipe 5 is formed by protruding and expanding.

Furthermore, when the front insertion ends of the extension connecting pipes 5 inserted by pushing or pulling from both sides reach the middle part of the existing buried pipe 2, the connecting guide mechanism 7 is expanded to hold it within the front insertion end of one of the extension connecting pipes 5, and the tapered guide portion 8 of the connecting guide shape that tapers toward the front insertion end of the other extension connecting pipe 5 is protruded and expanded, and at least one of the extension connecting pipes 5 is further pushed or pulled in, so that it is guided by the connecting guide mechanism 7 that has expanded into the connecting guide shape, correcting any positional deviation between the front insertion ends of the extension connecting pipes 5 while connecting the front insertion ends of both extension connecting pipes 5, and then the connecting guide mechanism 7 is contracted and removed.This is a method for repairing existing buried pipes for waterways as described in claim 2.

The method for repairing an existing buried pipe for a waterway described in any one of claims 1 to 3 also relates to a method for repairing an existing buried pipe for a waterway, characterized in that the extension coupling pipe 9 is pushed into the end of the connecting pipe 5, the next connecting pipe 5 is pushed into the coupling pipe 9, and the next connecting pipe 5 is pushed into or pulled into the existing buried pipe 2, repeatedly forming the extension coupling pipe 5 within the existing buried pipe 2, and inserting the front end of the extension coupling pipe 5 up to the middle of the existing buried pipe 2, with the coupling pipe 9 previously connected to the front end of one of the extension coupling pipes 5 positioned in the middle.

The method for repairing an existing buried pipe for a waterway according to any one of claims 1 to 4 further relates to a method for repairing an existing buried pipe for a waterway, characterized in that the extension connecting pipe (5) is inserted from both end openings (6) of the existing buried pipe (2) below the manhole (1), and is pulled in using a pull-in string (12) connected to the insertion base end of the extension connecting pipe (5), and the extension connecting pipe (5) is pulled and inserted toward the middle of the existing buried pipe (2), and the next connecting pipe (5) is connected to the insertion base end connecting pipe (5) of the extension connecting pipe (5) to further extend it, and then the pull-in string (12) is replaced with the connecting pipe (5) and the pull-in string (12) is pulled in again, and the extension connecting pipe (5) is extended and pulled and inserted to the middle of the existing buried pipe (2), and the front insertion ends of the extension connecting pipes (5) pulled and inserted from both sides into the existing buried pipe (2) reach the middle of the existing buried pipe (2), and then at least one of the extension connecting pipes (5) is pulled and inserted to pull and connect the front insertion ends together.

The present invention is configured as described above. Synthetic resin connecting pipes are inserted into the existing buried pipe by pushing or pulling them into the existing buried pipe from both ends of the separated manholes toward its midpoint. The next connecting pipe is then connected to the connecting pipe and inserted as it is extended. This halves the insertion distance, facilitating the insertion process. Even if the front ends of the extension connecting pipes become misaligned midway through the existing buried pipe, simply pushing or pulling them in further automatically corrects the misalignment by guiding them through the connecting guide mechanism, which has been expanded into the shape of a connecting guide. This allows the front ends of the extension connecting pipes to be connected midway. This is an innovative method for repairing existing buried pipes for waterways, making it easy, safe, and inexpensive to reconstruct a new waterway within the existing buried pipe using a new pipe with multiple connecting pipes connected to it.

This is an explanatory exploded oblique view showing an extension connecting pipe of this embodiment, which connects the ends of the connecting pipes of this embodiment via joint pipes, extends the overall length, and is inserted into an existing buried pipe to form a new pipe. This is a schematic explanatory diagram 1 showing the process of one-sided pull-in insertion in the middle of repairing an existing buried pipe by connecting the ends of a connecting pipe via a joint pipe from a manhole in this embodiment into the existing buried pipe, extending the overall length, and then pulling and inserting this extension connecting pipe into the existing buried pipe to form a new pipe. This is a schematic explanatory diagram 2 showing the process of connecting the ends of a connecting pipe from a manhole into an existing buried pipe via a joint pipe, extending the overall length, and then pulling and inserting this extension connecting pipe into the existing buried pipe to form a new pipe for repair, after completion of pull-in insertion on one side and still in the middle of pull-in insertion on the other side. This is a schematic explanatory diagram 3 of the completed state of both pull-in and insertion, showing the process of connecting the ends of a connecting pipe from the manhole into an existing buried pipe via a joint pipe, extending the overall length, and then pulling and inserting this extension connecting pipe into the existing buried pipe to form a new pipe and repair it. This is a schematic explanatory diagram 4 of the completed intermediate connection and new waterway, showing how the connecting pipe in this embodiment is connected at its ends via a joint pipe into the existing buried pipe from the manhole, extending the overall length, and then pulling and inserting this extension connecting pipe into the existing buried pipe to form a new pipe and repair it. In this embodiment, the front insertion ends of the extension connecting pipes inserted from both sides into the existing buried pipe can be connected at the middle part of the existing buried pipe by expanding the front insertion end of at least one of the extension connecting pipes, which is expanded into a connecting guide shape.By pulling in one or both of the extension connecting pipes, the positional misalignment is corrected, and Figure 1 is an explanatory procedure before the expansion operation, showing the procedure for connecting the front insertion ends of both extension connecting pipes. FIG. 2 is an explanatory diagram showing the procedure of the present embodiment during the expansion operation (of the connection guide mechanism). FIG. 3 is an explanatory diagram of the procedure of the present embodiment, illustrating the midway point of the retraction and connection at the intermediate portion. FIG. 4 is an explanatory procedure showing the procedure of this embodiment when the retraction and connection at the intermediate portion is completed. FIG. 5 is an explanatory procedure for the contraction, removal, and recovery (of the connection guide mechanism) showing the procedure of this embodiment.

The optimal embodiment of the present invention will be briefly explained below, illustrating its operation with reference to the drawings.

A large number of connecting pipes 5 made of synthetic resin are used, which can be connected at their ends by pushing them in directly or through joints 9 (joints) to add to and extend the overall length. Specifically, both the connecting pipes 5 and joint pipes 9 have a diameter that allows them to be inserted into the existing buried pipe 2, and are long enough to be introduced through the manhole 1 and inserted through the end opening 6 of the existing buried pipe 2 below the manhole 1.

Then, the connecting pipes 5 are inserted into the existing buried pipe 2 from both of the end openings 6 of the existing buried pipe 2 below the manhole 1, which is located, for example, a dozen meters (for example, 40 meters) away, toward the middle of the existing buried pipe 2, and the next connecting pipe 5 is pushed into this connecting pipe 5, for example, via the joint pipe 9, to form an extension connecting pipe 5, which is then pushed into the existing buried pipe 2 or pulled in from the opposite side by, for example, pulling the pull-in string 12.

When the front insertion ends of the extension connecting pipes 5 inserted from both sides into the existing buried pipe 2 reach the middle of the existing buried pipe 2, simply by pushing or pulling them further, they are guided by the connecting guide mechanism 7, which has been expanded into a connecting guide shape, and any misalignment between the front insertion ends of the extension connecting pipes 5 is automatically guided and corrected, so that the front insertion ends of both extension connecting pipes 5 are pushed in or pulled in to connect.

Then, by shrinking or removing (retrieving) this connecting guide mechanism 7, a new pipe 3 consisting of an extension connecting pipe 5 connected to multiple connecting pipes 5 can be installed inside the existing buried pipe 2, and a new waterway 4 made of this new pipe 3 can be easily reconstructed inside the existing buried pipe 2.

As a result, the new pipe 3 can be installed inside the existing buried pipe 2 using an inexpensive, lightweight synthetic resin connecting pipe 5, eliminating the need to dig up the existing buried pipe 2. The new waterway 4 can be easily, safely, and inexpensively reconstructed by simply inserting the connecting pipe 5 through the manhole 1 and connecting it sequentially while pushing or pulling in the extension connecting pipe 5. Furthermore, because this push-in or pull-in connection and extension work is performed from both manholes 1, not only is the distance halved, but the shorter distance also reduces the impact of pipe meandering and obstructions caused by sediment, making the work even easier.

Furthermore, with this invention, when the front insertion ends of the extension connecting pipes 5 reach the middle of the existing buried pipe 2 (when they are in close proximity to each other), simply by pushing or pulling one further toward or away from the other, they are guided by the connecting guide mechanism 7, which is expanded and shaped like a connecting guide. Any misalignment between the front insertion ends of the extension connecting pipes 5 is automatically guided and corrected, and the front insertion ends of both extension connecting pipes 5 are connected together. This makes it extremely easy, safe, and inexpensive to reconstruct a new waterway 4 within the existing buried pipe 2 using new pipes 3 connected to a large number of these connecting pipes 5.

Specific Example 1 of the present invention will be described below with reference to the drawings.

This method repairs existing buried pipes (2) by installing new pipes (3) inside existing buried pipes (2) for waterways, such as sewer pipes or industrial drainage pipes, buried between manholes (1) to reconstruct a new waterway (4). Excavation is not required; a short connecting pipe (5) (e.g., a commercially available PVC pipe) is inserted into the existing buried pipe (2), and the next connecting pipe (5) is pushed into the previous connecting pipe (5) via, for example, a joint pipe (9) (e.g., a commercially available PVC joint pipe). This creates an extension connecting pipe (5) consisting of multiple connecting pipes (5) and joint pipes (9), and inserts the extension connecting pipe (5) into the existing buried pipe (2). This repair method installs new pipes (3) using these extension connecting pipes (5) inside the existing buried pipe (2), reconstructing a new waterway (4).

Specifically, the new pipe 3 in this embodiment is composed of a number of synthetic resin connecting pipes 5 (for example, commercially available PVC pipes approximately 40 mm long and slightly smaller in diameter than the existing buried pipe 2, with sealing material 13 at the connecting ends so that they can be connected in a sealed state simply by pushing them together via coupling pipes 9), and a number of synthetic resin coupling pipes 9 (commercially available PVC joint pipes).These connecting pipes 5 have a diameter slightly smaller than the diameter of the existing buried pipe 2 so that they can be inserted into the manhole 1 and further into the existing buried pipe 2, and are set to a length (approximately 40 mm) that allows them to be introduced through the manhole 1 and inserted through the end opening 6 of the existing buried pipe 2 below the manhole 1.

To explain further, the connecting pipes 5 are inserted into the existing buried pipe 1, such as a sewer pipe below the manhole 1, from both end openings 6 toward the middle of the existing buried pipe 2, which may be approximately 40 meters apart, and the next connecting pipe 5 is then connected to this connecting pipe 5 via a joint 9 (joint) and inserted as it is extended.

Specifically, the extension coupling pipe 9 is pushed into the end of the connecting pipe 5 to connect it, and then the next connecting pipe 5 is pushed into this coupling pipe 9 to connect it, and inserted into the existing buried pipe 2. This process is repeated to form the extension coupling pipe 5, and the front end of this insertion pipe is positioned in the middle of the existing buried pipe 2. The coupling pipe 9 is then pushed into and connected to one of the front ends of the extension coupling pipe 5 positioned in this middle section.

When the front insertion ends of the extension connecting pipes 5 inserted from both sides into the existing buried pipe 2 reach the middle of the existing buried pipe 2, for example, when they approach each other by approximately 30 mm, the expandable and contractible connecting guide mechanism 7, which serves as the connecting guide, is retracted to the middle and expanded. Then, by simply pushing or retracting the extension connecting pipe 5 further, it is guided by the connecting guide mechanism 7, which has expanded to the shape of the connecting guide, correcting any misalignment between the front insertion ends of the extension connecting pipes 5 and connecting the front insertion ends of both extension connecting pipes 5 together.

After connecting in this manner and installing the new pipe 3 using the extension connecting pipe 5 inside the existing buried pipe 2, the connecting guide mechanism 7 is shrunk, removed and recovered, and the new waterway 4 using the new pipe 3 is reconstructed inside the existing buried pipe 2 to repair it.

More specifically, the connection guide mechanism 7 of this embodiment expands to hold one of the extension connecting tubes 5 within the insertion front end, while the tapered guide portion 8 of the push-in connection guide shape, which tapers toward the inside of the other extension connecting tube 5, expands and protrudes.

Furthermore, in this embodiment, when the front insertion ends of the extension connecting pipes 5 inserted from both sides into the existing buried pipe 2 reach the middle of the existing buried pipe 2 (when the ends reach a point where they face each other and are close to each other), the connection guide mechanism 7 pulls them in a contracted state to this middle section using the introduction and recovery string 10 or the like, and introduces air from the air introduction pipe 11 to expand them, holding them within the front insertion end of one of the extension connecting pipes 5 and holding this one extension connecting pipe 5 in the middle section of the existing buried pipe 2, while the other extension connecting pipe The tapered guide portion 8 of the connecting guide mechanism 7, which is tapered toward the inside of the extension connecting tube 5, protrudes and expands. Simply pushing or pulling the extension connecting tube 5 further in or out guides it into the tapered guide portion 8 of the connecting guide mechanism 7, which has expanded into the connecting guide shape. Even if the front insertion ends of the extension connecting tubes 5 are misaligned, this is automatically corrected so that the front insertion ends of both extension connecting tubes 5 are connected together. The connecting guide mechanism 7 is then contracted by the introduction and recovery string 10, allowing it to be removed and recovered.

In addition, in this embodiment, the connection guide mechanism 7 is configured so that the tapered guide portions 8 expand symmetrically when expanded. The expanding tapered guide portions 8 are made of rubber, which has good slip resistance, strength, and durability. A lubricant is also applied to the surface of the tapered guide portions 8 and to the front insertion end of the extension connecting tube 5 to make the push-in or pull-in connection even smoother.

This connection guide mechanism 7 may be previously installed and expanded at the end of one of the extension connecting pipes 5. However, as described above, the extension connecting pipes 5 are inserted into the existing buried pipe 2 from both sides to a predetermined position using the introduction and retrieval strings 10 for deflated introduction and deflated removal and retrieval, and then retracted into this front insertion end position in a deflated state. When connecting the front insertion ends at this intermediate section, the expansion operation is performed to expand the mechanism. Then, by further pushing or retracting one end toward the other, the mechanism is automatically guided by the tapered guide portion 8 of the connection guide mechanism 7, which has been expanded into the shape of the connection guide. This guides and corrects any misalignment between the front insertion ends of the extension connecting pipes 5, allowing the front insertion ends of both extension connecting pipes 5 to be easily connected together.

As mentioned above, air is introduced into and exhausted from the connecting guide mechanism 7 via the air inlet pipe 11 to expand and contract it. This air inlet pipe 11 is pulled from inside the extension connecting pipe 5 to the manhole 1 and then to the ground, where it is connected to an air supply device to introduce and exhaust air.

In addition, operations such as inserting the extension connecting pipe 5 to the specified position, expanding and contracting it, and connecting it at the middle section are performed while images are monitored by a camera installed inside the existing buried pipe 2.

Furthermore, in this embodiment, rather than sequentially pushing in and inserting from both end openings 6 of the existing buried pipe 2 below the manhole 1, which are spaced apart, the pipe is sequentially pulled in and inserted from the end opening 6 on the opposite side.

In other words, in this embodiment, the extension connecting pipe 5 is pulled from the opposite side using a retraction string 12 connected to the insertion base end of the extension connecting pipe 5, thereby retracting the extension connecting pipe 5 to the middle of the existing buried pipe 2.

Specifically, the extension connecting pipe 5 is pulled and inserted toward the middle of the existing buried pipe 2, and the next connecting pipe 5 is connected to the insertion base end connecting pipe 5 of the extension connecting pipe 5 via a joint pipe 9, and the next connecting pipe 5 is further extended. Then, the retraction cord 12 is attached to this connecting pipe 5 and the retraction cord 12 is retracted. This process is repeated, and the extension connecting pipe 5 is extended and retracted into the middle of the existing buried pipe 2.

Furthermore, after the front insertion ends of the extension connecting pipes 5 that have been pulled and inserted into the existing buried pipe 2 from both sides reach the middle of the existing buried pipe 2, the connecting guide mechanism 7 is expanded as described above, and at least one of the extension connecting pipes 5 is pulled and inserted in this manner, thereby pulling and connecting the front insertion ends together.

To explain further, in this embodiment, a pull-in lid 16 is provided as a pull-in engaging part that detachably engages with the insertion base end side opening of the connecting pipe 5 that is closest to the insertion base end of the extension connecting pipe 5, and the end of the pull-in string 12 (pull-in wire) is detachably engaged on the inside of this pull-in lid 16, and this pull-in string 12 is passed through the extension connecting pipe 5 and pulled out from the end opening 6 of the existing buried pipe 2 on the opposite side, guided to the outside of the manhole 1 via a pull-in pulley 15, and this pull-in string 12 is retracted by being wound up by a pull-in device 14 (for example, a pull-in winding device with a winding drive roller), so that it is retracted sequentially.

Therefore, the connecting pipe 5 is extended and the pull-in cover 16 is replaced while being pulled in by the pull-in string 12, so that the extension connecting pipe 5 is pulled in and inserted up to the middle part of the existing buried pipe 2.

That is, the next connecting pipe 5 is further connected to the insertion base end connecting pipe 5 of this extension connecting pipe 5 via a joint pipe 9 to extend it further, the retraction lid 16 is replaced with the insertion base end side of this connecting pipe 5, the retraction string 12 is also replaced with the retraction lid 16 attached to this connecting pipe 5, and the extension connecting pipe 5 is again retracted with the retraction device 14, and this process is repeated so that the extension connecting pipe 5 is extended and retracted and inserted into the middle part of the existing buried pipe 2.

Note that the present invention is not limited to this example, and the specific configuration of each component can be designed as appropriate.

1 Manhole 2 Existing buried pipe 3 New pipe 4 New waterway 5 Connecting pipe/extension connecting pipe 6 End opening 7 Connection guide mechanism 8 Tapered guide portion 9 Joint pipe
10. Introduction and retrieval string
11 Air intake pipe
12 Retractable cord
13 Sealing material
14 Retraction device
15 Pulling pulley
16 Retractable lid

Claims (5)

A method for repairing an existing buried pipe for a waterway, in which a new pipe is installed in an existing buried pipe for a waterway buried between manholes to reconstruct a new waterway,
The new pipe is made of a number of synthetic resin connecting pipes, the ends of which are connected together by pushing the new pipe in directly or through a joint pipe, so that the overall length can be extended by adding on to the new pipe, or the new pipe is made of a number of synthetic resin connecting pipes and a 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 can be introduced through the manhole and inserted through the end opening of the existing buried pipe below the manhole,
The connecting pipe is inserted into the existing buried pipe by pushing or pulling it from both of the end openings of the existing buried pipe below the manhole toward the middle part of the existing buried pipe, and the next connecting pipe is connected to this connecting pipe and inserted while being added,
The extension connecting pipes are inserted into the existing buried pipe by pushing or pulling from both sides until their front insertion ends reach the middle of the existing buried pipe, and the extension connecting pipes are further connected by pushing or pulling the front insertion ends together with an expandable and contractible connecting guide mechanism.
The front insertion ends of the extension connecting pipes inserted by pushing or pulling from both sides into the existing buried pipe are inserted until they reach the middle part of the existing buried pipe, and at least one of the extension connecting pipes is further pushed or pulled in , and guided by the connecting guide mechanism which has been expanded into a shape that serves as a connecting guide, correcting any positional deviation between the front insertion ends of the extension connecting pipes, and connecting both of the front insertion ends at the middle part of the existing buried pipe,
The connecting guide mechanism is contracted or removed,
A method for repairing an existing buried pipe for a waterway, characterized by installing a new pipe consisting of an extension connecting pipe to which a number of connecting pipes are connected within the existing buried pipe, and reconstructing the new waterway using this new pipe within the existing buried pipe. A method for repairing existing buried pipes for waterways as described in claim 1, characterized in that the connection guide mechanism is configured to hold one of the extension connecting pipes within the insertion front end by expanding, and to form a tapered guide portion of the connection guide shape that tapers toward the inside of the other extension connecting pipe. When the front insertion ends of the extension connecting pipes inserted by pushing or pulling from both sides reach the middle of the existing buried pipe, the connecting guide mechanism is expanded to hold one of the extension connecting pipes within the front insertion end, and the tapered guide portion of the connecting guide shape that tapers toward the front insertion end of the other extension connecting pipe is protruded and expanded to form the tapered guide portion;
By further pushing or pulling in at least one of the extension connecting pipes, the extension connecting pipes are guided by the connecting guide mechanism which has been expanded into the connecting guide shape, and the insertion front ends of the extension connecting pipes are connected to each other while correcting any positional deviation between the insertion front ends of the extension connecting pipes;
3. The method for repairing an existing buried pipe for a waterway according to claim 2, further comprising the step of shrinking and removing said connecting guide mechanism thereafter. A method for repairing an existing buried pipe for a waterway, as described in any one of claims 1 to 3, characterized in that the extension coupling pipe is pushed into the end of the connecting pipe, the next connecting pipe is pushed into the coupling pipe, and the push-insertion or pull-insertion process is repeated to form the extension coupling pipe within the existing buried pipe, and the front end of the extension coupling pipe is inserted up to the middle of the existing buried pipe, and the coupling pipe is previously connected to the front end of one of the extension coupling pipes positioned in the middle. The extension connecting pipe is inserted from both end openings of the existing buried pipe below the manhole, which are spaced apart, and pulled in by a pull-in string connected to the insertion base end side of the extension connecting pipe, and the extension connecting pipe is pulled and inserted toward the middle part of the existing buried pipe, and the next connecting pipe is connected to the insertion base end side connecting pipe of the extension connecting pipe to further extend it, and then the pull-in string is replaced with this connecting pipe and the pull-in string is pulled in again, and this process is repeated, so that the extension connecting pipe is pulled and inserted into the middle part of the existing buried pipe while being extended,
A method for repairing an existing buried pipe for a waterway as described in any one of claims 1 to 4, characterized in that the front insertion ends of the extension connecting pipes that are pulled and inserted from both sides into the existing buried pipe reach the middle part of the existing buried pipe, and then at least one of the extension connecting pipes is pulled and inserted to pull and connect the front insertion ends together.