Repair method for existing buried pipes for waterways

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

[Technical Field]

[0001] 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, by installing a new pipe inside the existing buried pipe to reconstruct a new waterway, and then repairing the existing buried pipe. [Background technology]

[0002] Existing buried pipes, such as sewer pipes between manholes and industrial drainage pipes, deteriorate due to corrosion and require 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 a resin-impregnated tubular fiber is inserted into the existing buried pipe and then cured to form a liner; and discontinuous pipe lining, in which a liner pipe is created by inserting short pieces of pipe into the existing buried pipe while joining them on-site. However, none of these methods have yet been developed to be easy, safe, and inexpensive.

[0003] For example, in the case of the discontinuous pipe lining, a repair method has been proposed in which a lightweight, inexpensive PVC pipe is introduced through a manhole, and this PVC pipe is then extended to install a new pipe inside an existing buried pipe used as a push-in waterway. Trial and error have been carried out to make this method a reality, but in reality, the manholes are often several tens of meters apart, and there are often undulating or meandering sections between them, and there may be residual sediment, earth, or other obstacles inside the existing buried pipe, making it difficult to push in and insert pipes over long distances while extending them. Furthermore, because these are waterway pipes for sewerage and industrial drainage, the PVC pipes must be of a fairly large diameter so as not to make the pipes smaller, making this type of repair method even more difficult, and it has not yet become widespread.

[0004] On the other hand, if the PVC pipe is inserted using a 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 it up to the middle of the existing buried pipe, there will almost always be a misalignment in the middle part, so simply pushing and pulling in the extension pipe in this middle part will not allow the front ends of the insertion to be connected together.

[0005] 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. Therefore, there is a need for safe and inexpensive rehabilitation work to be carried out as soon as possible. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has identified and solved such problems. It aims to provide an innovative method for repairing existing buried pipes for waterways, which involves inserting synthetic resin connecting pipes into the existing buried pipe by pushing or pulling them into the existing buried pipe from both bottoms of spaced-apart manholes towards its middle, and then connecting the next connecting pipe to this connecting pipe and inserting it while adding to it. This reduces the insertion distance by half, making the insertion work easier. Even if the front ends of the extension connecting pipes become misaligned in the middle of the existing buried pipe, they are simply pushed or pulled in further, and are guided by a connecting guide mechanism that has been expanded into a connecting guide shape, so that the misalignment is automatically corrected. This makes it possible to connect the front ends of both extension connecting pipes at their middle, and it is an object of the present invention to provide an innovative method for repairing existing buried pipes for waterways, which makes it easy, safe, and inexpensive to reconstruct a new waterway within the existing buried pipe by connecting a large number of connecting pipes to this new pipe. [Means for solving the problem]

[0007] The gist of the present invention will be explained with reference to the accompanying drawings.

[0008] 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 have a large number of synthetic resin connecting pipes (5) configured so that the ends can be connected together by pushing the new pipe (3) in directly or via a joint pipe (9) so that the entire length can be extended by adding on to it, or to have a configuration consisting of a large number of these synthetic resin connecting pipes (5) and a large number of the synthetic resin joint pipes (9), and each connecting pipe (5) has a pipe diameter that can be inserted into the existing buried pipe (2) and a length that can be introduced through the manhole (1) and inserted from an end opening (6) of the existing buried pipe (2) below the manhole (1), and the connecting pipe (5) is inserted by pushing or pulling it into the existing buried pipe (2) from both of the end openings (6) of the existing buried pipe (2) below the manhole (1) that are spaced apart, towards the middle of the existing buried pipe (2), and the next connecting pipe (5) is connected to the connecting pipe (5) to add on to it, Insert The extension connecting pipes 5 are inserted into the existing buried pipe 2 by pushing or pulling from both sides until their front insertion ends reach a middle part of the existing buried pipe 2, and the extension connecting pipes 5 are further ... So, Ren Use Guide becomes The method for repairing an existing buried pipe for a waterway is characterized in that the extension connecting pipes 5 are guided by the connecting guide mechanism 7 expanded and formed to a desired shape, misalignment between the insertion front ends of the extension connecting pipes 5 is corrected, both insertion front ends are connected to each other at an intermediate portion within the existing buried pipe 2, the connecting guide mechanism 7 is contracted or removed, and the new pipe 3 consisting of the extension connecting pipes 5 connected to a large number of the connecting pipes 5 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.

[0009] The connecting guide mechanism 7 is expanded to hold one of the extension connecting pipes 5 in the insertion front end portion, and to tapered toward the other extension connecting pipe 5. Taren This relates to the method for repairing existing buried pipes for waterways according to claim 1, characterized in that the tapered guide portion 8 of the connecting guide shape is configured to be formed by protruding and expanding.

[0010] When the front end portions of the extension connecting pipes 5 inserted by pushing or pulling from both sides reach the middle portion of the existing buried pipe 2, the connecting guide mechanism 7 is expanded to hold one of the extension connecting pipes 5 in the front end portion of the extension connecting pipe 5, and to taper toward the front end portion of the other extension connecting pipe 5. Before This relates to a method for repairing existing buried pipes for waterways as described in claim 2, characterized in that the tapered guide portion 8 of the connection guide shape is formed to protrude and expand, and at least one of the extension connecting pipes 5 is further pushed in or pulled in, thereby guiding it into the connection guide mechanism 7 which has been formed to expand into the connection guide shape, correcting any positional deviation between the insertion front ends of the extension connecting pipes 5, and connecting the insertion front ends of both extension connecting pipes 5, and then the connection guide mechanism 7 is contracted and removed.

[0011] The method for repairing existing buried pipes for waterways described in any one of claims 1 to 3 is characterized in that the extension joint pipe 9 is pushed into and connected to the end of the connecting pipe 5, the next connecting pipe 5 is pushed into and connected to this joint pipe 9, and the push-insertion or pull-insertion is repeated to form the extension connecting pipe 5 within the existing buried pipe 2, and the front insertion end of this insertion pipe is inserted up to the middle part of the existing buried pipe 2, and the joint pipe 9 is previously connected to the front insertion end of one of the extension connecting pipes 5 positioned in this middle part.

[0012] The method for repairing an existing buried pipe for a waterway according to any one of claims 1 to 4 further comprises: inserting the extension connecting pipe (5) from both end openings (6) of the existing buried pipe (2) below the manhole (1) that are spaced apart, and pulling in the extension connecting pipe (5) using a pull-in string (12) connected to the insertion base end of the extension connecting pipe (5); pulling and inserting the extension connecting pipe (5) toward the middle of the existing buried pipe (2); connecting the next connecting pipe (5) to the insertion base end connecting pipe (5) of the extension connecting pipe (5) to further extend the extension connecting pipe (5), and then reattaching the pull-in string (12) to this connecting pipe (5) and pulling in the pull-in string (12); repeating this process, the extension connecting pipe (5) is 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 pulling and inserting at least one of the extension connecting pipes (5) to pull and connect the front insertion ends together. [Effects of the Invention]

[0013] Since the present invention is configured as described above, connecting pipes made of synthetic resin are inserted into the existing buried pipe by pushing or pulling them into the existing buried pipe from both of the lower parts of the spaced-apart manholes towards its middle, and then the next connecting pipe is connected to this connecting pipe and inserted as it is extended. This reduces the insertion distance by half, making the insertion work easier. Furthermore, even if the front ends of the extension connecting pipes become misaligned in the middle part of the existing buried pipe, they are simply pushed or pulled in further, and are guided by the connecting guide mechanism, which has been expanded into the shape of the connecting guide, so that the misalignment is automatically guided and corrected. This makes it possible to connect the front ends of both extension connecting pipes at their middle parts. This is an innovative method for repairing existing buried pipes for waterways, which makes it easy, safe, and inexpensive to reconstruct a new waterway within the existing buried pipe by connecting a large number of these connecting pipes to the existing buried pipe. [Brief explanation of the drawings]

[0014] [Figure 1]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. [Figure 2] This is a schematic explanatory diagram 1 showing the process of one-sided pull-in insertion in the middle of repairing the existing buried pipe by connecting the ends of a connecting pipe via a joint pipe from the manhole of 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. [Figure 3] 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. [Figure 4] 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 in this embodiment. [Figure 5] 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. [Figure 6] 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 expands and forms 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. [Figure 7] FIG. 2 is an explanatory diagram showing the procedure of the present embodiment during the expansion operation (of the connection guide mechanism). [Figure 8]FIG. 4 is an explanatory diagram of the procedure of the present embodiment, illustrating the midway point of the retraction and connection at the intermediate portion. [Figure 9] FIG. 4 is an explanatory diagram showing the procedure of the present embodiment when the retraction and connection at the intermediate portion is completed. [Figure 10] 5 is an explanatory diagram of the procedure for shrinking, removing, and recovering (the connection guide mechanism), showing the procedure of this embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] The best mode for carrying out the present invention will now be briefly described with reference to the accompanying drawings, illustrating the operation of the present invention.

[0016] A large number of connecting pipes 5 made of synthetic resin are used, which are configured so that the ends can be connected together by pushing them in directly or through joints 9 (joints), thereby adding to and extending the overall length.Specifically, both the connecting pipes 5 and joint pipes 9 are prepared with a pipe diameter that can be inserted into the existing buried pipe 2, and with a length that can be introduced through the manhole 1 and inserted through the end opening 6 of the existing buried pipe 2 below the manhole 1.

[0017] 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 under the manhole 1, which are separated by, for example, several tens of meters (for example, 40 meters), toward the middle of the existing buried pipe 2, and the next connecting pipe 5 is pushed into the connecting pipe 5 via, for example, the joint pipe 9 (joint), to form an extension connecting pipe 5, and then pushed into the existing buried pipe 2 or pulled in from the opposite side, for example. string Pull 12 and insert it.

[0018] When the front insertion ends of the extension connecting pipes 5 inserted from both sides into the existing buried pipe 2 reach the middle part of the existing buried pipe 2, they are simply pushed in or pulled in further, and 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 to each other.

[0019] Thereafter, by shrinking or removing (recovering) this connecting guide mechanism 7, a new pipe 3 consisting of an extension connecting pipe 5 to which a large number of connecting pipes 5 are connected can be installed within the existing buried pipe 2, and a new waterway 4 made of this new pipe 3 can be easily reconstructed within the existing buried pipe 2.

[0020] Therefore, the new pipe 3 can be constructed inside the existing buried pipe 2 using a connecting pipe 5 made of inexpensive and lightweight synthetic resin, and there is no need to dig up the existing buried pipe 2. The new waterway 4 can be easily, safely, and inexpensively reconstructed by introducing it through the manhole 1 and pushing or pulling in the extension connecting pipe 5 while connecting it one by one. Moreover, since this push-in or pull-in connection and extension work to insert it into the existing buried pipe 2 is done from both manholes 1, not only is the distance halved, but because the distance is short, there is less impact from the pipe meandering or obstructions caused by sediment, making the work even easier.

[0021] Furthermore, in the present invention, when the front insertion ends of the extension connecting pipes 5 reach the middle part of the existing buried pipe 2 (when they are in a closely opposing state), by simply pushing or pulling one further toward the other, they are guided by the connecting guide mechanism 7, which is expanded and formed 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 connected to each other.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. [Example]

[0022] A specific embodiment 1 of the present invention will be described with reference to the drawings.

[0023] This is a repair method for existing buried pipes 2 by installing a new pipe 3 inside an existing buried pipe 2 for a waterway such as a sewer pipe or industrial drainage pipe buried between manholes 1 and reconstructing a new waterway 4. No digging work is required; a short connecting pipe 5 (for example, a commercially available PVC pipe) is inserted into the existing buried pipe 2, and the next connecting pipe 5 is pushed in and connected to this connecting pipe 5 via, for example, a joint pipe 9 (for example, a commercially available PVC pipe for joints), forming an extension connecting pipe 5 in which many connecting pipes 5 and joint pipes 9 are connected, and inserting this into the existing buried pipe 2. In this repair method, a new pipe 3 is installed inside the existing buried pipe 2 using this extension connecting pipe 5, and a new waterway 4 is reconstructed.

[0024] Specifically, the new pipe 3 in this embodiment is composed of a number of connecting pipes 5 made of synthetic resin (for example, commercially available PVC pipes with a length of about 40 mm and a diameter slightly smaller than the diameter of 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 through coupling pipes 9), and a number of coupling pipes 9 (commercially available PVC pipes for joints) made of synthetic resin, whose ends can be connected together by simply pushing them together through coupling pipes 9, and the 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 (about 40 mm) that can be introduced through the manhole 1 and inserted through the end opening 6 of the existing buried pipe 2 below the manhole 1.

[0025] To explain further, the connecting pipe 5 is inserted into the existing buried pipe 1 from both end openings 6 of the existing buried pipe 2, such as a sewer pipe below the manhole 1, which is located about 40 meters apart, toward the middle of the existing buried pipe 2, and the next connecting pipe 5 is connected to this connecting pipe 5 via a joint 9 and inserted as it is extended.

[0026] Specifically, the extension coupling pipe 9 is pushed into the end of the connecting pipe 5 to connect it, and the next connecting pipe 5 is pushed into this coupling pipe 9 to connect it, and inserted into the existing buried pipe 2, and this process is repeated to form the extension coupling pipe 5, and the front end of this insertion is placed in the middle part of the existing buried pipe 2, and the coupling pipe 9 is previously pushed into and connected to one of the front ends of the extension coupling pipe 5 that is placed in this middle part.

[0027] When the front insertion ends of the extension connecting pipes 5 inserted from both sides into the existing buried pipe 2 reach the middle part of the existing buried pipe 2, for example when they are brought closer together to about 30 mm, the expandable and contractible connecting guide mechanism 7 which serves as the connecting guide is pulled to the middle part and expanded, and by simply pushing or pulling the extension connecting pipe 5 further in, it is guided by the connecting guide mechanism 7 which has expanded and formed into the connecting guide shape, and the positional deviation between the front insertion ends of the extension connecting pipes 5 is corrected so that the front insertion ends of both extension connecting pipes 5 are connected to each other.

[0028] After the new pipe 3 is installed inside the existing buried pipe 2 by the extension connecting pipe 5 in this way, the connecting guide mechanism 7 is shrunk, removed, and collected, and the new waterway 4 by the new pipe 3 is connected to the existing buried pipe 2. Inside tube 2 We are currently rebuilding and repairing these structures.

[0029] To explain further, the connection guide mechanism 7 of this embodiment is configured to expand to hold one of the extension connecting tubes 5 within the insertion front end, and to protrude and expand the tapered guide portion 8 of the push-in connection guide shape, which has a tapered shape toward the inside of the other extension connecting tube 5.

[0030] 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 part of the existing buried pipe 2 (when the ends reach the point where they face each other and approach each other), the connecting guide mechanism 7 pulls them in a contracted state to this middle part using the introduction and recovery string 10 or the like, introduces air from the air introduction pipe 11, and operates to expand, holding one of the extension connecting pipes 5 within the front insertion end part, and holding this one extension connecting pipe 5 in the middle part of the existing buried pipe 2, and the other extension connecting pipe The tapered guide portion 8 of the connecting guide shape, which is tapered toward the inside of the extension connecting tube 5, is configured to protrude and expand, so that by simply pushing or pulling the extension connecting tube 5 further in, it is guided by the tapered guide portion 8 of the connecting guide mechanism 7, which has expanded into the connecting guide shape, and even if the insertion front ends of the extension connecting tubes 5 are misaligned, they are automatically guided and corrected so that the insertion front ends of both extension connecting tubes 5 are connected to each other, and then this connecting guide mechanism 7 is contracted by the introduction and recovery string 10 so that it can be removed and recovered.

[0031] In this embodiment, the connecting guide mechanism 7 is configured so that the tapered guide portions 8 expand symmetrically when expanded, and the expanding tapered guide portions 8 are made of rubber, which has good slip resistance, strength, and durability. A lubricant is applied to the surface of the tapered guide portions 8 and to the front end of the extension connecting tube 5 for insertion, making the pushing and pulling of the connecting tube even smoother.

[0032] In addition, this connecting guide mechanism 7 may be provided in advance at the end of one of the extension connecting pipes 5 and expanded, but as mentioned 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 recovery strings 10 for shrinking introduction and shrinking removal and recovery, and then retracted and positioned in a shrinked state at this front insertion end position, and then when connecting the front insertion ends at this intermediate part, the expansion operation is performed to expand it, and by further pushing or retracting one side toward the other, it is automatically guided by the tapered guide portion 8 of the connecting guide mechanism 7 which has been expanded into the shape of the connecting guide, and any positional deviation between the front insertion ends of the extension connecting pipes 5 is guided and corrected, making it possible to easily connect the front insertion ends of both extension connecting pipes 5 to each other.

[0033] As mentioned above, air is introduced into and exhausted from the connecting guide mechanism 7 through the air introduction pipe 11 to expand and contract it. This air introduction pipe 11 is pulled out from inside the extension connecting pipe 5 to the manhole 1 and further to the ground, where it is connected to an air supply device to introduce and exhaust air.

[0034] In addition, the operation of inserting the extension connecting pipe 5 to the specified position, the operation of expanding and contracting it, and the operation of connecting it at the middle part are performed while images are monitored by a camera installed inside the existing buried pipe 2.

[0035] In addition, in this embodiment, rather than sequentially pushing 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.

[0036] That is, in this embodiment, the extension connecting pipe 5 is pulled from the opposite side 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 up to the middle part of the existing buried pipe 2.

[0037] Specifically, this extension connecting pipe 5 is pulled and inserted toward the middle part of the existing buried pipe 2, and the next connecting pipe 5 is connected to the insertion base end connecting pipe 5 of this extension connecting pipe 5 via a joint pipe 9 to further extend it, while again replacing the pull-in cord 12 with this connecting pipe 5 and pulling in this pull-in cord 12, and repeating this process, so that the extension connecting pipe 5 is extended and pulled in to the middle part of the existing buried pipe 2.

[0038] 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 part 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 to pull and connect the front insertion ends together.

[0039] To explain further, in this embodiment, a retraction lid 16 is provided as a retraction engaging part that is removably engaged with the insertion base end side opening of the connecting tube 5 closest to the insertion base end of the extension connecting tube 5, and an end of the retraction string 12 (retraction wire) is removably engaged inside the retraction lid 16. 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 other side, and is guided to the outside of the manhole 1 via a pulley 15. string The wire 12 is wound by a winding device 14 (for example, a winding device using a winding drive roller) so that the wire 12 is drawn in sequentially.

[0040] Therefore, the connecting pipe 5 is extended and the retracting lid 16 is replaced. string 12, and the extension connecting pipe 5 is pulled in and inserted up to the middle part of the existing buried pipe 2.

[0041] That is, the next connecting pipe 5 is further connected to the insertion base end side connecting pipe 5 of this extension connecting pipe 5 via a joint pipe 9, and further extension is performed. The retracting lid 16 is attached to the insertion base end side of the connecting pipe 5,The retracting string 12 is also reattached to the retracting lid 16 which has been replaced with the connecting pipe 5. The extension connecting pipe 5 By repeating the pulling-in process using the pulling-in device 14, the extension connecting pipe 5 is extended and pulled and inserted into the intermediate portion of the existing buried pipe 2.

[0042] The present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate. [Explanation of symbols]

[0043] 1 manhole 2 Existing buried pipes 3 New tube 4 New waterway 5 Connecting pipes and extension connecting pipes 6 End opening 7. Connection guide mechanism 8 Tapered guide section 9. Joint Pipe 10. Introduction and retrieval string 11 Air intake pipe 12 Pull-in string 13 Sealing material 14 Retraction device 15 Pulling pulley 16 Retractable lid

Claims

1. 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.

2. 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.

3. 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 waterway pipe according to claim 2, further comprising the step of shrinking and removing said connecting guide mechanism.

4. A method for repairing existing buried pipes for waterways described in any one of claims 1 to 3, characterized in that the extension coupling pipe is pushed into and connected to the end of the connecting pipe, the next connecting pipe is pushed into and connected to this coupling pipe, and the process of pushing or pulling into the existing buried pipe is repeated to form the extension coupling pipe within the existing buried pipe, and the front insertion end of the extension coupling pipe is inserted and positioned up to the middle of the existing buried pipe, and the coupling pipe is previously connected to the front insertion end of one of the extension coupling pipes positioned in this middle part.

5. 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.

Images