JP2781903B2 - Underground pipeline repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an underground pipe in which a cable lead-in pipe for wiring a power cable or a telecommunication cable or the like is formed underground. The present invention relates to a method for repairing underground pipes that is to be repaired from the inside of the pipes.

[Conventional technology]

Conventionally, underground conduits for laying this kind of power cable or communication cable underground usually include a plurality of fume pipes, steel pipes, cast iron pipes or the like, such as manholes installed at predetermined intervals. Multiple steps up and down across the pit,
It is constructed by laying it in a form where multiple rows are arranged on the left and right and laying it sequentially underground such as under the road to form a pipeline.Plural rows of underground pipelines are configured in advance and cables to be wired etc. Is adopted to select an arbitrary pipeline which is the empty pipeline and to lay it down.

By the way, the pipe body of the existing underground pipeline has a form in which a plurality of fume pipes, asbestos pipes, steel pipes, cast iron pipes, etc. are connected by pipe joints between vertical holes such as manholes.
Since this is laid under the road etc., the joint state of the pipe joint changes due to the load and vibration of vehicles passing on the road, earthquake, aging, etc. Up and down steps may occur, bend, or the components of the pipe joints may deteriorate, resulting in leakage of groundwater or intrusion of earth and sand. There was a problem.

Therefore, it is considered to repair the empty pipeline of the existing pipeline laid underground after a certain period of laying, such as filling the mortar or forming a resin-lined coating film from the inner surface of the pipe as it is laid. .

Various methods have been proposed as a method for repairing the above-mentioned tubular body, for example, Japanese Patent Application Laid-Open Nos. 61-103568 and 61-1035.
As shown in No. 69, etc., a repair resin and a pig device that pushes the resin from behind are inserted into the pipe inner surface, and the pig device is towed by a tow rope, and the pig outer periphery and the pipe inner wall surface are connected to each other. As shown in the lining resin layer formed to a predetermined viscosity from the gap, or as shown in JP-A-60-139991,
By pulling a replacement pig etc. that slides in an airtight manner on the inner surface of the pipe, the mortar or resin arranged on the front side of the pig is pushed from behind and fills the gap etc. of the pipe joint part The technology is known.

[Problems to be solved by the invention]

However, in the above-described prior art, when a test piece such as a bobbin is inserted in advance before repairing the inner surface of the empty pipeline, the above-described repair method or the like is applied to a pipe through which the test piece passes. However, if there is a bent part in the pipe joint or other places, or if the pipe joint or the broken part is displaced and there is a step up and down, the test piece cannot pass, and There is a problem that repair methods such as technology cannot be applied.

The present invention has been proposed to solve the above-described problems, and a method of repairing an underground pipe such as a fume pipe laid underground or an empty pipe of an underground pipe such as a steel pipe or a cast iron pipe in the laid state, If there is a bent part or a vertical step at the pipe joint or other part of the pipeline, secure the pipe inner diameter by cutting and grinding the bent part or the step part in advance so that the test piece such as a bobbin passes. It is an object of the present invention to provide a method of repairing an underground pipeline in which the above-mentioned cut portion and the like are filled with a special mortar and filled with a resin to perform repair.

[Means for solving the problem]

In order to achieve the above object, a method of repairing an underground pipeline according to the present invention is a method of repairing an underground pipeline laid underground over a pit such as a manhole from the inner surface in a laid state, A detection step in which a monitoring device is inserted from one side of the tube and a test piece is inserted from the other side to investigate and detect the occurrence of a bent portion or a step portion in the tube, with a repair unit of one section between the manholes. And, when the occurrence of the bent portion or the step portion is detected by the detection step, the monitoring device is inserted from one manhole side, and the cutting tool is inserted from the other manhole side, while monitoring by the monitoring device. A cutting step of cutting a bent portion or a stepped portion in the pipe by a predetermined length, and when the cutting step is completed, a grinding tool is inserted into the cut portion and the grinding is performed. One wire of the tool is connected to a traction device such as an air cylinder through a return member, and the other of the grinding tools is connected to a rotary drive device that rotates the grinding tool via a rod, and the grinding tool And a pair of front and rear pigs are connected to a towing line inserted from one manhole to the other manhole after the grinding step, and a mortar is accommodated between the pair of pigs. Then, in the process of pulling the pair of pigs in the traveling direction and passing through the cutting location, filling the cutting location with mortar, and performing a repair process of coating the inner surface of the pipe with a resin after curing of the mortar. It is characterized by having done.

[Action]

Based on such a configuration, according to the present invention, a bent portion, a step portion, or the like where a test piece such as a bobbin cannot pass through a pipe joint portion or another portion in an empty pipe of an underground pipe is not allowed. A detection step of investigating and detecting the location of the occurrence by a monitoring device and a test piece, and, when the occurrence of a bent portion or a stepped portion is detected by the above-described detection process, bending is performed from one manhole side by a television in a tube or the like as a monitoring device. A cutting step of cutting a bent portion or a stepped portion by a predetermined length by a cutting tool inserted from the other manhole while monitoring a portion where the portion or a stepped portion is generated, and inserting the grinding tool into the cutting portion to perform the cutting. A grinding process for grinding the part,
When the grinding process is completed, the test piece has a shape that allows it to pass as shown in Fig. 11, so after confirming this through a test test of passing the test piece, insert it from one end of the empty tube between the manholes to the other end. Attached a pair of front and rear pigs to the tow line that was made, and accommodated mortar between the pair of pigs,
In the process of pulling the pair of pigs in the traveling direction and passing through the cutting location, filling the cutting location with mortar, further filling the resin after curing of the mortar, and performing a repair process to increase the adhesive strength. Even if there is a bent part or a place where a step is formed at the top and bottom of the pipe joint part or other place that is an empty pipe of the underground pipe, it is not possible to excavate that part and repair it from the outer surface, Repair can be performed more easily and firmly than the inner surface of the pipe.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 schematically shows one section to be repaired according to the present invention. In the figure, reference numeral 1 denotes an underground pipe to be repaired. This underground pipeline 1 is usually 50mm to 300m
A fume pipe and an asbestos pipe having a diameter of m are connected to a predetermined length L from a plurality of pipe joints 2. For example, one pipe group (not shown) is arranged in a plurality of rows vertically and a plurality of rows horizontally. By laying these under the road in order between the pits of manholes A and B, a plurality of pipes are formed underground.

A power cable or a telecommunications cable is inserted through the underground conduit 1. The underground conduit 1 is used for repairing an empty conduit through which no cable is inserted among a plurality of rows of conduits. .

First, when repairing the empty pipe of the underground pipeline 1,
The space between the manholes A and B, which are the openings 1a and 1b at both ends of the underground pipeline 1, is defined as a repair unit L for one section, and the openings 1a and 1 at both ends are provided.
b are connected to the guide tubes 3a and 3b, respectively, and the manholes A and
Work vehicles 21 and 22 are arranged on the ground of B.

Then, as shown in FIG. 2, the monitoring device (in-tube television) 4 is inserted through one of the guide tubes 3a (or 3b), or as shown in FIG. 3, the other guide tube 3b (or 3).
Test piece 5 such as bobbin slightly smaller than the pipe diameter from a)
In the detection step of conducting a passage test by passing through the pipe, whether there is a bent portion 10a or a place where a stepped portion 10b is formed above and below the pipe joint 2 or the underground pipe 1 shown in FIG. Is investigated and detected.

As a result of the above detection step, if there is a stepped portion 10b or the like where the test piece 5 cannot pass through in the pipe of the underground conduit 1, as shown in FIG. 4, the stepped portion 10b is shifted downward. A cutting process is performed in which the cutting tool 6 is inserted from the guide tube 3b, the in-tube television 4 is inserted from the other guide tube 3a, and the cutting tool 6 performs cutting while monitoring the step 10b with the in-tube television 4.

That is, the cutting tool 6 is formed hollow with a cutting blade 6a at the distal end, and a piano wire rod 7 is connected to the rear. A drive shaft 9a driven by a hand-held electric motor 8 in the manhole B is detachably connected to a hook 7a formed at the rear end of the piano wire rod 7 via a joint 9b. The cutting tool 6 is rotated at a low speed, the cutting is advanced while gradually applying a pressing force to the cutting edge 6a from the rear, and the cutting powder is stored in the hollow portion of the cutting tool 6, as shown in FIG. The cutting process is performed as shown.

Here, in the cutting step using the cutting tool 6, damage to adjacent pipes (not shown) is prevented, and the cutting edge 6a comes into contact with the upper part of the underground pipe 1 to damage the upper part of the pipe wall, causing sediment to fall. So that there is no cutting edge 6a
The direction of cutting and the cutting situation are monitored.

If the upper part of the pipe wall of the underground pipeline 1 tends to be damaged during the above-mentioned cutting process, the cutting is immediately stopped, and a measure such as using a cutting edge having a small cutting diameter is taken. When cutting is completed for the cutting length l, the cutting tool 6 is pulled out,
The cutting powder is eliminated, and other cutting pieces, earth and sand, etc. are eliminated outside the pipe using a not-shown cleaning device and a collecting device such as a collecting container. In order to remove the above-mentioned cut pieces and earth and sand, a method such as high-pressure washing which may cause earth and sand to enter is not used.

On the other hand, after the cutting step is completed and the cut pieces and the earth and sand are removed, as shown in FIG. The tip of this grinding tool 16 is not provided with a blade, but a body is provided with a grinding blade 16a, and the tip is provided for returning the twisting of the towing line 17 to the towing line 17 inserted from one guide tube 3a of the tube. The pulling side of the towing line 17 is connected to a piston rod 19 provided on an air cylinder 20a of a wire pulling device 20, as shown in FIG. Then, the piston 20c is moved in the direction of the arrow by the air pressure from the compressed air inlet 20b, and the grinding tool 16 is pulled. Then, a pressure valve (not shown) is adjusted so that the air pressure at the time of the initial movement of the grinding tool 16 is always maintained so that the traction force of the grinding tool 16 is constant. By rotating the rod 7 connected to the rear of the grinding tool 16 by the hand-held electric motor 8, the cutting portion 10 of the tube is ground.

The return member 18 is connected to the towing line with the rotation of the grinding tool 16.
Even if 17a rotates, the towing line 17a is connected to the inner race (or outer race) of the towing line 17b, and the towing line 17b is connected to the outer race (or inner race).

Here, the grinding tool 16 is advanced while maintaining a constant traction force on the towing line 17, and only a rotational force is applied to the grinding tool 16 without applying a pressing force from behind.

Also, in the grinding process using the grinding tool 16, the in-pipe television 4 is inserted into the underground pipeline 1 and the grinding is performed while monitoring the grinding state. After the grinding tool 16 passes through the grinding location 10,
A passing test of the test piece 5 is performed by removing cutting pieces and earth and sand. If there is a risk of pipe damage during the grinding process, secure the inside diameter necessary for the passage of the pigs 12 and 13 and partially fill it with special mortar 14 to reinforce it. Is carried out.

When the grinding process is completed by the grinding tool 16, as shown in FIG. 8, a pair of front and rear pigs 12, 11 are inserted into a towing line 11 inserted from one end to the other end of the underground pipe 1 between the manholes A and B. 1
A special mortar 14 having predetermined characteristics is injected between the pigs 12 and 13 from a mixer or the like of the work vehicle 22 via a compressor.

Here, the tow line 11 is connected to the rear pig 13 through the front pig 12, and the tow line 11a connected to the front pig 12 passes through the rear pig 13 to the rear. The rear pig 13 is extended by pulling the tow line 11 forward, and moves so as to push out the mortar 14 and the front pig 12. In the process of pulling and moving the pigs 12 and 13 in the traveling direction, as shown in FIGS. 9 and 10, the mortar 14 is filled in the cut portion 10 after the grinding, and the mortar 14 is hardened. After that, as shown in FIG. 11, a finished pipe line is filled with a resin 15 to perform a repairing step for improving the adhesive strength and water tightness of the mortar 14.

In the above repair process, the towing line 1 is
By pulling 1, the special mortar 14 to be injected between the pair of pigs 12 and 13 is used to cut the ground cut portion 10 in the underground pipeline 1.
The mortar 14 between the pigs 12 and 13 is extruded outward at the cutting portion 10 and is filled in the cutting portion and the step portion.

Here, the cutting portion 10 and the step portion 10
If the mortar 14 is not sufficiently filled in b, the filling is repeated.

The special mortar 14 in the repairing step has predetermined characteristics, and the repairing resin 15 is, for example, an epoxy resin including a main agent and a curing agent.

In addition, in the construction as shown in FIG. 10, when filling the cutting portion 10 with the special mortar 14 injected between the pair of front and rear pigs 12, 13, pressurized air is fed from the front of the front pig 12 above. Alternatively, the traction cable 11a connected to the front pig 12 and extending rearward through the rear pig 13 is pulled in the direction opposite to the traveling direction, thereby increasing the filling pressure of the mortar 14 and increasing the filling efficiency. You may make it improve.

Here, the pressure of the pressurized air pumped from the front of the front pig 12 and the tensile force for pulling the front pig 12 rearward are as follows:
In each case, the traction is set to be smaller than the traction force for pulling the rear pig 13 in the traveling direction, and the mortar 14 is filled in the cutting portion 10 while the rear pig 13 moves in the traveling direction.

FIGS. 12 (a) to 12 (c) are schematic explanatory views of a cutting process and a repairing process showing a repairing method of the underground pipeline 1 when the inside of the underground pipeline 1 is a bent portion 10a. The description is omitted because it is the same as the above-described embodiment.

〔The invention's effect〕

As described above, according to the method of repairing an underground pipeline according to the present invention, a test piece such as a bobbin cannot pass through a pipe joint portion and other locations in an empty tube of the underground pipeline. A detection step of investigating and detecting the occurrence of a bent portion or a step portion using a monitoring device and a test piece, and, when the occurrence portion of the bent portion or a step portion is detected by the above detection process, from one manhole side. A cutting step and a grinding step for cutting and grinding through a cutting tool inserted from the other manhole and allowing the test piece to pass through while monitoring a bent portion or a step portion with a monitoring device,
After the grinding step, a pair of front and rear pigs are connected to a tow rope inserted from one manhole to the other manhole, mortar is injected between the pair of pigs, and the pair of pigs are pulled in the traveling direction. In the process of passing through the cutting part, a repairing step of filling the above cutting part with mortar is performed, and there are bent parts and steps at the upper and lower parts in the empty pipe of the underground pipe, especially that part Even when the pipe cannot be repaired from the outer surface by excavation, the repair can be performed more easily and firmly than the inner surface of the pipe, so that the work efficiency is high and the repair work can be performed efficiently.

In addition, after the mortar filled in the above-mentioned cutting portion is cured, by confirming the passage of the test piece and refilling the resin, it is possible to increase the adhesive strength and improve the water tightness, and the compensation is complete. The repair effect can be enhanced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing one section to be repaired according to the present invention, FIGS. 2 and 3 are explanatory views of a detection step performed in a preceding stage of the repair method according to the present invention, and FIG. Explanatory drawing showing the start of the process, FIG. 5 is a diagram showing the completion of the cutting process, FIG. 6 is an explanatory diagram showing the grinding process, FIG. 7 is a diagram showing a traction device in the grinding process, and FIG. FIG. 9 and FIG. 10 are explanatory views showing the state of filling the mortar in the repairing step, FIG. 11 is a sectional view showing the completed state of the repairing step, and FIGS. 12 (a) to (c). FIG. 3 is a schematic explanatory view showing a repair method when a portion to be repaired is a bent portion. A, B ... manhole, 1 ... underground conduit, 2 ... joint part, 4 ... television inside tube, 5 ... test piece, 6 ... cutting tool, 10 ... cutting part, 11 ... tow rope , 12, 13,… pig, 14… mortar, 15… epoxy resin, 16… grinding tools.

Claims (1)

(57) [Claims] 1. A method of repairing a pipe of an underground pipe laid underground over a pit such as a manhole from an inner surface in a laid state, wherein the space between the manholes is set as a repair unit of one section. A detecting step of inserting a monitoring device from one side and a test piece from the other side to investigate and detect the occurrence of a bent portion or a step in the pipe; and the occurrence of the bent or step in the detection process. When detecting, insert the monitoring device from one manhole side, insert a cutting tool from the other manhole side,
A cutting step of cutting a predetermined length of a bent portion or a stepped portion in the pipe while monitoring by the monitoring device, and when the cutting process is completed, insert a grinding tool into the cut portion, and remove the grinding tool. One of the wires is connected to a traction device such as an air cylinder through a return member, and the other of the grinding tools is connected to a rotary drive device that rotates the grinding tool via a rod, and A grinding step of grinding the cutting portion, and after connecting the pair of front and rear pigs to a tow rope inserted from one manhole to the other manhole after the grinding step, accommodating mortar between the pair of pigs, In the process of pulling the pair of pigs in the traveling direction and passing through the cutting location, filling the cutting location with mortar, and coating the inner surface of the pipe with a resin after the mortar is cured. Repairing method of underground conduit, characterized in that so as to construction by the repairing process.