JPH0146192B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention provides an underground conduit for repairing an empty tube body of an underground conduit that forms a cable lead-in conduit for wiring telecommunications cables etc. underground from inside the pipe while it is still installed. This relates to repair methods.

[Technical problem of the invention]

Underground conduits for wiring telecommunications cables, etc. underground usually consist of multiple pipe bodies (steel pipes, cast iron pipes, or hard vinyl pipes) running between vertical holes such as manholes in multiple stages above and below. Even if multiple rows are arranged on the left and right, they are constructed by laying underground in order under roads etc. to form a conduit.Multiple rows of underground conduits are constructed in advance and the cables to be routed are etc., by selecting an arbitrary empty pipe and leading it in for installation. By the way, the pipe bodies of existing underground pipelines are often in the form of steel pipes or cast iron pipes connected by pipe joints. As described above, rust occurs in metal pipe bodies over many years, and the rust gradually spreads within the pipe, eventually forming a ``knot-like'' shape and reducing the effective diameter of the pipe. In addition, because the above-mentioned underground pipes are installed under roads, the joint condition of the pipe joints changes due to the load of vehicles passing on the road, vibrations, earthquakes, etc. Gaps are created, and foreign matter such as water and earth and sand can enter the pipes through these gaps and corrosion holes that occur in the pipes themselves, causing the pipes to become clogged. Due to these reasons, in underground pipelines that have been installed for a certain number of years, even if you try to install a new cable into the empty pipeline, it may become impossible to insert it. It is being considered to repair the pipe from inside the pipe while it is still installed.

[Prior art]

Conventionally, as a repair method for this type of pipe body, as described in JP-A No. 55-44320, resin paint is filled between two pigs and this is inserted into the pipe to be repaired. A method of forming a lining film of resin paint on the inner surface of a pipe is known, but repairing the lining of the inner surface of the pipe using this method alone is not enough, as mentioned above, in the case of underground pipes, vehicles passing on the road Due to loads, vibrations, earthquakes, etc., the joints of pipe joints may shift and create gaps in the joints, so repairs are not complete.

[Purpose of the invention]

Therefore, when repairing an empty pipe in an underground pipeline from the inside, the present invention first attaches the resin to the joint of the pipe, fills the gap in the joint with resin to improve the sealing performance of the joint, and then A resin lining layer is formed on the inner surface of the pipe in order to regenerate the pipe.In particular, the process of filling the pipe joint with resin and the process of lining the inner surface of the pipe with resin eliminates the need to connect between manholes. The object of the present invention is to provide a method for repairing underground pipes that can efficiently turn back two pipes in one section at the same time and in a reciprocating process.

[Structure of the invention]

In order to achieve this object, the present invention sets the repair unit between manholes as one section, and passes a tow cable from one manhole side to the first empty pipe within the two empty pipes in the said section. The wire is turned around on the manhole side and passed through the second empty pipe in a folded manner, and by reciprocating traction of this tow cable, resin is pulled from one end of the pipe into the pipe by a filling pig, and the pipe is connected to a joint. A resin filling process in which the resin is filled into the gap between the two pipes, and a lining process in which the resin is moved into the pipe using a lining pig to form a resin lining layer on the inner surface of the pipe are performed simultaneously between the two manholes. It is characterized by being constructed in a folded manner.

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 schematically shows one section of repair work, and reference numeral 1 in the figure indicates an underground pipe to be repaired. This underground conduit 1 consists of a plurality of pipes (usually made of steel pipes or cast iron pipes with a diameter of 50 mm to 100 mm connected to a predetermined length using pipe joints) at predetermined intervals, for example, up and down. A total of 9 pipes are arranged in 3 tiers on each side and 3 rows on each side to form one pipe group, and these pipes are sequentially laid underground under the road between manholes (or handholes) A and B. This is formed by forming multiple rows of conduits. Telecommunications cables and the like are routed underground by passing cables through this underground conduit 1, but the multiple rows of conduits are divided into conduits through which cables are passed, and conduits through which cables are not inserted. The present invention is intended to repair this empty pipe line. In the present invention, when repairing the empty pipes of the underground pipe 1, one section is repaired between the manholes A and B, which are the openings at both ends of the underground pipe group, and a plurality of empty pipes existing in the section are repaired. Among the pipes, two empty pipes 11 and 12 are targeted for simultaneous repair as a pair.
Hereinafter, the empty pipe 11 will be referred to as the first repair pipe, the empty pipe 12 will be referred to as the second repair pipe, and the manhole A will be referred to as the first manhole.
Manhole B is called the second manhole. In order to repair the first repair pipe and the second repair pipe, a work vehicle 21 equipped with a winch device 31 for the pulling rope 3 and a resin supply device 4 is placed on the ground of the first manhole A. Further, a resin supply device 5 is arranged on the ground on the other second manhole B side. The resin supply devices 4 and 5 disposed above the ground in the first and second manholes A and B each include main resin tanks 41 and 51 and curing agent tanks 42 and 52.
These tanks 41, 42 and 5
The resin outlet pipes 43, 44 and 53, 54 sent out from each tank 1, 52 are connected to a known two-liquid mixer (static mixer) 45, 55, where the main resin resin and curing agent are mixed. It is of the type that is sent out in a mixed state. Note that each main agent tank 41, 51 is connected to a vacuum pump 46, 5, respectively.
6, so that bubbles generated in the main resin can be defoamed. In order to introduce the resin from the resin supply devices 4 and 5 into the first repair pipe 11 and the second repair pipe 12, manholes A and B are connected to openings at both ends of the first repair pipe 11. Guide tubes 11a and 11b and guide tubes 12a and 12b connected to both end openings of the second repair tube 12 are provided. These guide tubes 11a, 12b and 12a, 12b are provided with resin injection ports 14, 15, respectively.
The respective resin discharge side pipes 47, 57 are selectively connectable, and the guide pipes 11a, 11b
The resin can be separately introduced into the first repair pipe 11 and the second repair pipe 12 from both manhole A and B sides through the pipes 12a and 12b. In addition, the first repair pipe 11 and the second repair pipe 12
To do this, the tow rope 3 is first diverted by a pulley 33 from inside the first manhole A, and then inserted into the first repair pipe 11 from a winch device 31 installed on the ground on the side of the first manhole A, and then the other On the second manhole B side, one piece of pipe is rotated by a pulley 35 and inserted into the second repair pipe 12 in a folded manner, and its tip is detoured upward by a pulley 34 and wound around the winch device 31. The traction rope 3 is looped back through the first repair pipe 11 and the second repair pipe 12. Therefore, the winch device 31 is constructed in a double-barrel type, and while winding the towing rope 3 on one drum, the other drum performs the unwinding operation, and by this alternate winding and unwinding operation, the towing rope 3 is 3 can be reciprocated in a folded manner within the first repair pipe 11 and the second repair pipe 12 with a stroke between manholes A and B. The above-mentioned traction rope 3 includes a replacement pig 61 for resin filling shown in FIG. 2, a resin traction pig 62,
A leveling pig 63, and a first pig 71, a second pig 72, and a third pig 73 for resin lining shown in FIG.
and a lining finishing pig 81 shown in FIG. On the other hand, the resin filling process and the resin lining process, which will be explained below, can be performed on each tube by turning back and forth by pulling the towing rope 3 back and forth in the manner shown in the work process explanatory diagram of FIG. 6. (Resin filling process) The resin filling process is a process of filling resin into the joint gaps of a plurality of pipe joints a interposed on the pipe paths of the first repair pipe 11 and the second repair pipe 12. , to explain the first repair pipe 11, in this step, for example, in one first manhole A, the above-mentioned replacement pig 61, resin traction pig 62, and leveling pig 63 are attached to the traction rope 3 (the second
(see figure). Each of these pigs 61, 62, and 63 is made of an elastic material, and the leading replacement pig 61 and the second resin pulling pig 62 have their circumferential surfaces airtightly attached to the inner surface of the pipe to be repaired. The displacement pig 61 has an outer diameter dimension such that it can slide in contact with the tow rope 3, and the replacement pig 61 is slidably inserted into the tow rope 3, and when moving inside the pipe, it is moved due to sliding resistance with the inner wall of the pipe. A required pressure can be applied to the resin C disposed between the rear towing pig 62 and the rear towing pig 62. After attaching the pigs 61, 62, and 63, the leading replacement pig 61 is inserted from the end of the guide tube 11a by pulling the rope 3, and the second resin pulling pig 62 is inserted into the end of the guide tube 11a. At the inserted stage, open the resin injection port 14 and insert the resin supply device 4.
Filling resin C is injected. The filling resin C used here is a two-component resin liquid that cures at room temperature, with a mixing ratio of the main resin and curing agent of 3 to 1:1 by weight, and a contact curing time of 3 to 5 hours. . The components of the main agent are, for example, 40 parts of bisphenol type A diglycidyl ether, 40 parts of bisphenol A side chain type diglycidyl ether, 20 parts of polyfunctional diluent, 10 parts of filler, and the components of the curing agent, for example, 20 parts of modified aliphatic polyamine. An epoxy resin containing 20 parts of modified aliphatic polyamine, 10 parts of polyamide, and 5 parts of filler is used. By injecting the resin C, the leading replacement pig 61
Resin C is interposed between the towing pig 62 and the towing rope 3, and in this state the towing rope 3 is pulled toward the second manhole B on the right side. By this traction, the resin C is pushed by the traction pig 62 and introduced into the empty tube 11, and moves to the right inside the tube at a predetermined traction speed. The pressing force from the displacement pig 61 acts on the pipe, and the resin itself generates considerable pressure due to viscous resistance due to contact with the inner wall of the pipe.
When the resin C passes through the pipe joint part a of the pipe to be repaired 11, the resin C is filled into the gap of the pipe joint part a at the above-mentioned filling pressure. At this time, if a leak occurs in the pipe joint part a, the air in the joint gap escapes to the outside through the leakage part by press-fitting the resin with the above filling pressure, so the gap is completely filled with resin. However, if no leakage occurs in the pipe joint part a, the air in the gap is compressed, which may inhibit the filling of the resin C into the pipe joint part gap. Therefore, as shown in FIG. 3, the replacement pig 61 has an air escape groove 61b on the outer periphery of a cylindrical pig body 61a, the end of which opens toward the front end, and a circumferential direction with respect to the air escape groove 61b. resin guiding grooves 61c are provided at different positions and the ends thereof open toward the rear end side, and the inner ends of both grooves 61b and 61c are mutually disposed in the longitudinal direction (traction direction). It is formed in an overlapping shape. When the replacement pig 61 configured in this way is used, during the process of the replacement pig 61 reaching the pipe joint part a and passing there, the groove 61b is formed in the joint part gap.
It is in communication with the front space of the replacement pig 61 through the groove 61b, and the air in the gap escapes to the front space through the groove 61b, so that the resin C is released through the other groove 61c under the resin pressure. As a result, the resin C flows into the gap of the pipe joint part a while going around the outer periphery of the pig body 61a, and as a result, replacement and filling of the resin C can be performed accurately. In this way, the resin C is pushed by the towing pig 62 and passes through the pipe line of the pipe to be repaired 11, so that each pipe fitting part a interposed on the pipe line is sequentially filled with resin into the joint part gap, This resin filling repairs the pipe joint part a to improve its sealing performance. At the end of the stroke, when the displacement pig 61, resin pulling pig 62, and leveling pig 63 are pulled out from the guide pipe 11b in the second manhole B, the winch device 32 stops pulling the towing rope 3, and the second manhole Inside B, the pig for resin filling is removed from the towing rope 3, and the residue of the filling resin is collected from the opening at the tip of the guide tube 13, and the next resin lining step is carried out. (Resin lining process) In the resin lining process, the first repair pipe 11, the second
This is a step of forming a resin lining layer on the inner surface of each pipe of the repair pipe 12. In this step, the first pig 71, the second pig 72, and the 3 pig 7
3 (see Figure 4). These pigs 71, 72, and 73 have different body diameters D ₁ , D ₂ , and D ₃ , and the first
The relationship is as follows: pig diameter D ₁ <second pig diameter D ₂ <third pig diameter D ₃ , and a guide pig 74 is attached in front of the first pig 71 . After installing the pig, the towing rope 3 is moved from the second manhole B side to the first manhole A by reversing the winch device 31, contrary to the resin filling process described above.
Pull to the left towards the side. When the first pig 71 is inserted from the end of the guide tube 11b by this traction, the resin injection port 15 of the guide tube 11b is opened and the lining resin is supplied from the resin supply device 5.
is injected before the first pig 71. The lining resin E used here is a two-component type resin liquid that cures at room temperature, with a mixing ratio of the main resin and curing agent of 3 to 1:1 by weight, and a contact curing time of 3 to 5.
It is a thing of time. Components of the main agent include, for example, 80 parts of bisphenol type A diglycidyl ether 10 parts of bisphenol A side chain type diglycidyl ether 10 parts of a polyfunctional diluent 10 parts of a filler Components of the curing agent include, for example, modified aliphatic polyamine An epoxy resin with a composition of 25 parts modified aliphatic polyamine 25 parts polyamide 10 parts filler 5 parts is used. At the beginning of the progression, the entire amount of lining resin E is in front of the first pig 71, and the resin E is in front of the first pig 71.
It is pushed by and moves inside the pipe 11 to be repaired. During this movement process, viscous resistance occurs in the resin E due to contact with the inner wall of the pipe, so the resin pressure applied to the clearance between the circumference of the first pig 71 and the inner wall of the pipe is maximum, and the diameter of the first pig 71 is Since D ₁ has a smaller diameter and a larger clearance than the other pigs, a thick layer of resin film is formed on the inner surface of the tube after the first pig 71 has passed. On the other hand, as it advances, the peripheral surface (clearance) of the first pig 71 is increased due to the resin pressure.
The resin flowing further backward begins to accumulate in front of the second pig 72. The diameter D ₂ of the second pig 72 is larger than the diameter D ₁ of the first pig 72 and the second pig 72 advances while correcting the resin coating layer formed on the inner surface of the pipe by the passage of the first pig 71. The resin pressure applied to the clearance between the circumferential surface of the two pigs 72 and the inner wall of the pipe also gradually increases. The third pig 73 advances while achieving a leveling effect on the resin film formed after passing the second pig 72 and forming a resin layer of an appropriate thickness on the inner surface of the tube. In the middle stage of progression, the amount of resin in front of the first pig 71 is halved, the resin pressure in the clearance between the circumferential surface of the first pig 71 and the inner wall of the pipe is lower than in the initial stage, and at this stage The amount of resin in front of the pig 72 becomes considerably large, and the resin pressure in the clearance between the circumferential surface of the second pig 72 and the inner wall of the pipe becomes high. Therefore, behind the second pig 72, the resin layer becomes slightly thicker than planned. This is leveled by the third pig 73, and a resin layer of an appropriate thickness is formed on the inner surface of the tube after the third pig 73 has passed. Additionally, surplus resin from this process begins to accumulate in front of the third pig 73. At the end of the progression, the amount of resin in front of the first pig 71 decreases significantly, and the resin pressure in the clearance between the first pig 71 and the inner wall of the pipe reaches its lowest state. At this time, the amount of resin in front of the second pig 72 is reduced, and the resin thickness behind the second pig 72 becomes thinner than expected. A considerable amount of surplus resin accumulates in front of the third pig 73, and this passes through the clearance between the third pig 73 and the inner wall of the pipe to compensate for the thickness, so that after passing through, a resin layer with an appropriate thickness is formed. is formed on the inner surface of the tube. In this way, as the resin E is pulled and moved by the first pig 71 to the third pig 73, a resin lining layer of a required thickness is formed on the inner surface of the pipe to be repaired 11, and the formation of this lining layer speeds up the regeneration of the pipe. It will be done. Note that the resin lining process described above may be a primary lining process, and subsequently, a secondary finishing lining process may be performed in the folding process. In this case, in the first manhole A on the stroke end side of the above-mentioned lining process, replace the lining finishing pig 81 and guy pin 82 shown in FIG. With the lining resin F (same type as the resin E) injected in front of the pig 81, the towing rope 3 is pulled to the right again. As a result, the resin film formed on the inner wall of the pipe by the above-mentioned primary lining is further leveled, and the lining layer can be finished to have a uniform thickness at each part over the entire length of the pipe 11 to be repaired. can.

【Working process】

In order to perform the resin filling process and the lining process on the first repair pipe 11 and the second repair pipe 12 by reciprocating traction with the towing rope 3, for example, as shown in the work process explanatory diagram of FIG. In the outgoing process, the first repair pipe 11 is filled with resin from the manhole A side, and in this case, the other second repair pipe 12 is filled with resin.
is treated as a play process. In the subsequent return trip,
The first repair pipe 11 is subjected to a primary lining process from the manhole B side, and the second repair pipe 12 is subjected to a resin filling process from the manhole A side. Furthermore, in the second outgoing process, the first repair pipe 11 is subjected to a secondary lining process from the manhole A side (this completes the repair work on the first repair pipe 11), and the second repair pipe 12 is subjected to a secondary lining process from the manhole A side. Perform the primary lining process from the side. In the return stroke, secondary lining is applied to the second repair pipe 12 from the manhole A side (the repair of the second repair pipe 12 is now completed), and at this time, the first repair pipe 11 is placed in the idle stroke. do. In this work process, it is sufficient to supply resin C for the resin filling process and resin F for the secondary lining process to the first repair pipe 11 and the second repair pipe 12 on the first manhole A side, and Since it is only necessary to supply the resin E for the primary lining process on the manhole B side, the resin supply operation becomes simple. In FIG. 1, numerals 91 and 92 are compressors installed on each side of manholes A and B, and 93 and 94 are generators that drive them.
The compressors 91 and 92 are connected to the tow rope 3
The guide tube 12, Pressurized air is injected into the pipe through resin injection ports 16 and 17 provided at 13.

【Effect of the invention】

According to the repair method according to the present invention, the following effects can be obtained. When carrying out the resin filling process and lining process, two empty tubes in an underground pipeline are treated as a pair, and the area between the manholes is treated as one section of repair. Since two pipes are installed at the same time by reciprocating traction of the tow cable that has been inserted back and forth, only one tow cable winding winch device is required, and two empty pipes can be repaired at the same time, resulting in high work efficiency. Suitable for repairing underground pipes where the distance between manholes is short. In addition, in the pipe body of the underground conduit 1, resin is first filled into the gap between the pipe joints in the pipe in the first step, and then a resin lining layer of the required thickness is formed on the inner surface of the pipe in the second step. Therefore, the pipe joint is repaired in a double manner by filling with resin and lining the inner surface. Therefore, even if there is a gap in the pipe joint, the inside of the pipe can be repaired with improved sealing performance. A lining layer can be formed on the surface, making repairs complete. In addition, since it is a folding method, in the lining process, even if the amount of resin is insufficient at the end of the primary lining stroke, the secondary lining will start from the end of the primary lining stroke, and as a result, the resin will not be applied to the inner surface of the tube. The lining layer can be formed uniformly over the entire length of the pipe. Furthermore, the working process for two empty pipes is as shown in Figure 6, for example, resin for the resin filling process and resin for the secondary lining process are supplied from one manhole side, and 1 resin is supplied from the other manhole side. By supplying only the resin for the next lining process, the resin supply from each manhole side can be unified, and workability can be greatly simplified.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view schematically showing one section of the repair method according to the present invention, Fig. 2 is an explanatory diagram of the resin filling process, Fig. 3 is a perspective view of the replacement pig, and Fig. 4 is a resin 1
FIG. 5 is an explanatory diagram of the second lining process, and FIG. 6 is an explanatory diagram of the repair work process of the present invention. 1... Underground pipe, 11, 12... Empty pipe to be repaired, 11a, 11b, 12a, 12b... Guide pipe, 14, 15... Resin injection port, 21... Work vehicle, 3... Towing rope , 31... winch device,
33, 34, 35... Pulley, 4, 5... Resin supply device, 41, 51... Main agent tank, 42, 52...
...Curing agent tank, 43,44,53,54...Outlet pipe, 45,55...Two-liquid mixer, 46,5
6... Vacuum pump, 47, 57... Resin discharge side pipe of two-liquid mixer, 61... Displacement pig, 62...
Resin traction pig, 63... Leveling pig, 71... Lining first pig, 72... Second lining pig, 73...
3rd pig, 74...Guide pig, 81...Lining finish pig, 82...Guide pig.

Claims (1)

[Claims] 1. Repair of pipes of underground conduits, which are formed by laying multiple pipes in a grouped arrangement underground between vertical holes such as manholes to form multiple rows of pipes, while still in the installed state. In this process, the area between the manholes is treated as a unit of repair, and the tow cable is passed through the first empty pipe from one manhole side, turned around at the other manhole side, and then the second empty pipe is installed. The wire is passed through the empty tube so that it is turned back and inserted, and by reciprocating traction of this tow cable, each empty tube is filled with resin from one end of the tube.The pig is pulled into the tube and resin is filled into the gap at the joint of the tube. The resin filling process and the lining process in which the resin is moved into the pipe using a lining pig to form a resin lining layer on the inner surface of the pipe are carried out by simultaneously folding the two empty pipes between the manholes. A repair method for underground pipes characterized by: