JPH0146191B2 - - Google Patents

Description

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

The present invention is an underground conduit system in which an empty tube body of an underground conduit, which has formed a cable lead-in conduit for wiring electrical communication cables, etc. underground, is repaired 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 a new cable is installed into the empty pipeline, it may become impossible to insert it. It is conceivable to repair empty pipes from inside the pipes while they are 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. However, when repairing underground pipes as described above, the load of vehicles passing on the road, vibrations, earthquakes, etc. may cause the joints of the pipe joints to shift and create gaps in the joints. Simply forming a resin lining film on the inner surface of the pipe as in the prior art does not completely repair the problem.

[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 lining the inner surface of the pipe with resin is a reciprocating process that improves efficiency. The purpose of this project is to provide a repair method for underground pipes that can be carried out in a timely manner.

[Structure of the invention]

In order to achieve this object, the present invention fills resin from one end of the pipe into an empty pipe of an underground pipe, with the area between manholes as a unit of repair, and moves the resin into the pipe using a pig. A resin filling process in which the resin is filled into the gap between the joints of the pipe, 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. The feature is that the construction is carried out by turning back and forth between manholes by reciprocating traction.

【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. It is made up of multiple rows of pipes underground.
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. This is an empty pipe, and the present invention is intended to repair this empty pipe. When repairing the empty pipes of the underground pipe 1, in the present invention, the area between the manholes A and B, which are the openings at both ends of the underground pipe group, is treated as one section of repair, and , a work vehicle 21 equipped with a winch device 31, 32 for the traction rope 3 inserted into the empty pipe 11 to be repaired, and a resin supply device 4, 5 for supplying resin into the empty pipe 11, respectively.
22 is placed. Each of the resin supply devices 4 and 5 installed in the work vehicles 21 and 22 includes a main resin tank 41 and 51 and a curing agent tank 42 and 52, respectively.
and 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 empty pipe 11 to be repaired, each manhole A,
Inside B, guide tubes 12 and 13 connected to the opening of the empty tube 11 are provided. Each guide tube 12,
13 are provided with resin injection ports 14 and 15, respectively, and resin discharge side pipes 47 and 57 of the two-liquid mixers 45 and 55 are connected to the resin injection ports 14 and 15, respectively.
are connected to each other so that resin can be introduced into the hollow tube 11 from both manhole A and B sides separately through the guide tubes 12 and 13. In addition, pulleys 33 and 3 are provided in each manhole A and B for detouring the traction rope 3 inserted into the empty pipe 11 to be repaired.
4 is provided, and both ends of the tow rope 3 are pulled out to the ground from each manhole A, B by these pulleys 33, 34 and connected to winch devices 31, 32, and the winch devices 31, 32 are alternately connected to each other. By winding and unwinding, the pulling rope 3 can be pulled in the reciprocating direction within the empty pipe 11 with the distance between the manholes A and B as a stroke. 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.
A lining finishing pig 81 shown in FIG. The "filling process" and the "resin lining process" can be carried out by turning back and forth by reciprocating the towing rope 3. (Resin filling process) The resin filling process is a process of filling resin into the joint gaps of the plurality of pipe fittings 11a interposed on the pipe path of the empty pipe 11. 1 In the manhole A, the above-mentioned replacement pig 61 and the resin traction pig 6 are attached to the traction rope 3.
2. Install the leveling pig 63 (see Figure 2). Each of these pigs 61, 62, and 63 is made of an elastic material. The replacement pig 61 is slidably inserted into the towing rope 3, and when moving inside the pipe, the replacement pig 61 slides backward due to the sliding resistance with the inner wall of the pipe. A required pressure can be applied to the resin C disposed between the towing pig 62 and the 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 12 by pulling the rope 3, and the second resin pulling pig 62 is inserted into the end of the guide tube 12. At the stage of insertion, the resin injection port 14 is opened and the filling resin C is injected from the resin supply device 4. 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 11a of the empty pipe 11,
The resin C is filled into the gap of the pipe joint portion 11a at the above filling pressure. At this time, if there is a leak in the pipe joint 11a, the air in the joint gap will escape to the outside through the leak due to the resin being press-fitted by the filling pressure, so that the gap will be completely filled with resin. However, if there is no leakage in the pipe joint part 11a, 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 an air escape groove 61b that extends in the circumferential direction. resin guiding grooves 61c are provided at different positions and the ends thereof open toward the rear end side, and the inner ends of the grooves 61b and 61c are opposite to each other 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 in which the replacement pig 61 reaches the pipe joint part 11a and passes there, the groove 6 is formed in the joint part gap.
1b to the front space of the replacement pig 61, and the air in the gap escapes to the front space via the groove 61b, so the other groove 61
The resin C is applied to the pig body 6 through resin C through resin pressure.
The resin C flows into the gap of the pipe joint 11a while going around the outer periphery of the tube 1a, and as a result, the resin C is replaced and filled accurately. In this way, the resin C is pushed by the pulling pig 62 and passes through the pipe line of the empty pipe 11, so that each pipe fitting part 11a interposed on the pipe line is sequentially filled with resin into the joint part gap, and this The pipe joint portion 11a is repaired with resin filling to improve its sealing performance. At the end of the stroke, when the displacement pig 61, resin traction pig 62, and leveling pig 63 are pulled out from the guide pipe 13 in the second manhole B, the winch device 32 stops pulling the traction 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) The resin lining process is a process of forming a resin lining layer on the inner surface of the empty pipe 11. In this process, in the second manhole B, a first resin lining layer is attached to the above-mentioned traction rope 3. Pig 71, 2nd
Attach the pig 72 and the third pig 73 (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 tow rope 3 is moved to the other winch device 31 in the opposite manner to the resin filling process described above.
From the second manhole B side to the first manhole A
Pull to the left towards the side. When the first pig 71 is inserted from the end of the guide tube 13 by this traction, the resin injection port 15 of the guide tube 13 is opened and the lining resin E is supplied from the resin supply device 5 to the front of the first pig 71. Inject into. 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 moves inside the empty tube 11 by being pushed by. 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 resin that flows backward from the peripheral surface (clearance) of the first pig 71 due to the resin pressure starts 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 to third pigs 71 to 73, a resin lining layer of a required thickness is formed on the inner surface of the empty tube 11, and the formation of this lining layer facilitates the regeneration of the tube. . 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, the lining finishing pig 81 and guide pin 82 shown in FIG. With the finishing lining resin F (this is the same type as the resin E) injected in front of the pig 81, the tow 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 over the entire length of the empty pipe 11. . 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
When passing the resin C into the empty tube 11, or when it is necessary to apply filling pressure to the resin C moving inside the tube, pressure is supplied from the air inlets 16 and 17 provided in the guide tubes 12 and 13. Air is injected into the tube.

【Effect of the invention】

According to the repair method according to the present invention, the following effects can be obtained. In the first step, the pipe body of the underground pipe 1 is filled with resin into the gap between the pipe joints interposed in the pipe.
Next, in the second step, a repair is performed to form a resin lining layer of the required thickness on the inner surface of the pipe, so the pipe joint part is repaired in a double manner, including resin filling and inner lining. Even if there are gaps, the lining layer can be formed on the inner surface of the tube with improved sealing properties.
The repair is complete and the repair effect can be enhanced. In addition, during repair, a resin filling process and a lining process are performed on the pipe body in the repaired section, with the area between the manholes that open at both ends of the underground pipe as a unit of repair. Since the work is carried out by turning back and forth in order by reciprocating traction, the work efficiency is high and repair work can be carried out efficiently. In addition, since it is a fold-back construction, in the case of resin lining process for the inner surface of the pipe, even if the amount of resin is insufficient at the end of the primary lining process, the secondary lining will be started from the end of the primary lining process. As a result, the resin lining layer can be uniformly formed on the inner surface of the tube over the entire length of the tube. In addition, if you prepare resin filling pigs, lining pigs, leveling pigs, etc. in each manhole separately, you will not have to carry the pigs, etc., and you will be able to use the tow rope even if you move on to repairing other empty pipes. Work efficiency is good because you can immediately move on to repairing the next empty pipe between the two manholes by just passing it through.
Effects such as these can also be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view schematically showing the entire 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, FIG. 4 is an explanatory diagram of the resin lining process, and FIG. 5 is an explanatory diagram of the secondary lining process. 1... Underground pipe, 11... Empty pipe, 12, 13...
... Guide tube, 14, 15 ... Resin injection port, 21,
22...Work vehicle, 3...Tow rope, 31, 32
... Winch device, 33, 34 ... Pulley, 4, 5
... Resin supply device, 41, 51 ... Main agent tank,
42, 52...Curing agent tank, 43, 44, 5
3,54... Outlet pipe, 45,55... Two liquid mixer, 46,56... Vacuum pump, 47,57...
... Resin discharge side pipe of two-liquid mixer, 61 ... Displacement pig, 63 ... Resin pulling pig, 63 ... Leveling pig, 71 ... Lining first pig, 72 ... Lining second pig, 73 ... Lining third pig,
74... Guide pig, 81... Lining pig finishing pig, 82... Guide pin.

Claims (1)

[Claims] 1. Repairing the inner surface of an underground conduit pipe in which multiple pipes are assembled and arranged in sequence between vertical holes such as manholes to form multiple rows of pipes, while still in the installed state. In this case, the gap between the joints of the pipe is repaired by pulling resin from one end of the pipe into the empty pipe of the underground pipe using a filling pig, with the area between the manholes as a unit of repair. a resin filling step of filling the inside with resin;
A lining process in which a resin is moved into the pipe by a lining pig to form a resin lining layer on the inner surface of the pipe is performed by turning back and forth between manholes by reciprocating traction of a towing rope inserted into the pipe. Repair method for underground pipes.