JP2688820B2 - Underground pipeline repair device and repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial applications]

INDUSTRIAL APPLICABILITY The present invention relates to an inner surface of a pipe body which is an empty pipe and a pipe joint among a plurality of rows of underground pipe lines in which a cable lead-in pipe line for wiring a cable for telecommunication or the like is formed underground between manholes The present invention relates to a repair device and repair method for underground pipes, which repairs the gap between the parts by painting from the inner surface of the pipe as it is installed.

[Prior art]

Conventionally, underground conduits for laying telecommunications cables and the like laid underground between manholes usually include a plurality of pipes, a plurality of pipes vertically, a plurality of pipes vertically, and a plurality of pipes on the left and right, between pits such as manholes. A line is arranged and laid underground such as under a road to constitute a pipeline, and a method of selecting and arranging cables to be wired by selecting an arbitrary pipeline that is an empty pipeline is adopted. Has been adopted. By the way, the pipe body of the existing underground pipeline is a steel pipe or cast iron pipe connected by a pipe joint part, and rust occurs in this pipe joint part due to aging and spreads inside the pipe, "bump-like"
Or reduce the effective diameter of the pipe, deterioration of the sealing material and the load and vibration of the vehicle passing on the pipe,
The connection state of the pipe joint will change due to an earthquake, etc., and a gap will be created in the joint, and foreign matter such as water and earth will enter and block the pipe line, so even if you try to lay a new cable, it will be impossible to insert it. Therefore, it has recently been considered to repair the empty pipe of the underground pipe from the inner surface of the pipe in the installed condition. In this pipe repair method, for example, as shown in Japanese Patent Laid-Open No. 61-103569, a repair resin is inserted on the inner surface of the pipe, and a pig device for pushing the resin from the rear is inserted, A resin lining layer having a predetermined thickness is formed on the inner surface of the pipe by pulling the above-mentioned pig device with a towing line and flowing out a lining resin having a predetermined viscosity from the gap between the outer circumference of the pig and the inner wall surface of the pipe to the rear of the pig. Or Japanese Patent Laid-Open No. 61-14691,
As shown in Japanese Patent Laid-Open No. 61-149692, by pulling a displacement pig or the like that is in airtight contact with the inner surface of the tubular body and slides,
There has been proposed a pig apparatus or the like that fills the resin in the gap of the pipe joint portion with the resin disposed on the front side of the pig from the rear side while lining the resin discharged from the replacement pig on the inner surface of the pipe.

[Problems to be solved by the invention]

By the way, in the repairing method of the pipe body according to the conventional method, the pipe inner surface lining method in the repairing section of the predetermined length and the resin filling method in the pipe joint portion are performed individually, and are performed individually. However, there is a problem that a complicated device is required, the number of work steps is large, and the cost is increased.

[Object of the invention]

The present invention has been proposed in order to solve the above-mentioned problems, and in the case of repairing the inner surface of a pipe that is an empty pipe among a plurality of rows of underground pipes in the installed state, the underground pipe Even if there is a pipe joint in the repair section of the road, a special lining pig is pulled to push the repair resin placed in front of the pig while continuously painting the inner surface of the pipe and pipe joint. The purpose is to carry out.

[Means for Solving the Problems]

In order to achieve the above object, according to the present invention, first, as an underground pipe repairing device, the inner surface of the pipe and a front portion in which a large number of projections for setting a predetermined clearance are arranged substantially evenly are provided. A lining pig having a rear portion that is larger in diameter than the inner diameter of the tubular body and has an elastic and sponge-like structure, a towing line that pulls the lining pig from the other side of the tubular body, and the tow line is slidably inserted. And a front pig which is arranged in front of the lining pig and is movable in an airtight manner with a predetermined resistance to the inner surface of the pipe, and pushes the resin arranged in front of the lining pig. The preceding pig pressurizes the resin to continuously apply the resin to the inner surface of the pipe and the gap between the pipe joint portions. Further, as a repairing method for the underground pipeline, a repairing method using the above-mentioned repairing device for the underground pipeline, in which the preceding pig is inserted from one of the pipes and the lining pig is reduced in diameter at the rear portion thereof. Then, the necessary amount of resin is filled between the preceding pig and the lining pig at that time, and the tow line is pulled forward from one side of the pipe to the other side of the lining pig. It is characterized in that the resin is continuously applied to the inner surface of the pipe body and the gap between the pipe joint portions in the process of pushing the arranged resin.

[Action]

Based on the above means, according to the present invention, laid in the underground between the manholes, by the tow line inserted from one to the other at the both end opening of the tubular body which is an empty tube,
In the process of pulling the lining pig and pushing the resin arranged in front of the pig, the pipe joint portion and the pipe inner surface existing in the repair section are continuously coated with the inner surface. Here, the lining pig has a function of applying resin to the pipe inner surface at the sponge-like rear portion, and when the lining pig reaches the pipe joint portion, the rear portion of the lining pig swells and The resin enters the gap from the front by the rear part of the sponge structure and discharges the accumulated air in the gap to the rear with the resin pressure generated by pig transport. Have. Also. The preceding pig presses the resin in the process of pushing the resin arranged in front of the pig by the lining pig to ensure the formation of the coating film. Therefore, even if there is a pipe joint in the pipeline,
A resin coating film can be continuously formed on the entire inner surface of the tube.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a main part schematically showing one section of repair work according to the present invention, FIG. 2 is an enlarged cross-sectional view showing a method of repairing an underground pipe which is a main part of FIG. 1, and FIG. [Fig. 3] is a cross-sectional view showing a repairing method of a pipe joint portion according to the present invention, in which reference numeral 1 is an underground pipeline to be repaired. This underground pipe line 1 is usually made by connecting a steel pipe or a cast iron pipe having a diameter of 50 mm to 100 mm by a plurality of pipe joint portions 13 to a predetermined length L between manholes A and B. The pipes are grouped vertically and horizontally at predetermined intervals to form an underground pipe line laid underground. A cable for telecommunications is inserted into this underground pipeline 1, but it repairs an empty pipeline in which a cable is not inserted among a plurality of rows of pipelines. When repairing the empty pipe of the above-mentioned underground pipeline 1, the manholes A and B, which are the openings 11 and 12 at both ends of the underground pipeline 1, are set as repair units L for one section, and the openings 11 and 12 are provided at both ends. Guide tubes 5 and 6 are connected to each other. The tow line 4 is inserted from the one end side guide pipe 5 of the underground pipe line 1 toward the other end side guide pipe 6, and the tip end of this tow line 4 is pulled out from the other end side guide pipe 6 to form pulleys 15a, 15b. It is diverted via the windshield and is wound around the winch device 8 installed in the work vehicle 16 or the like. Further, the leading pig 2 inserted into the pipe through the guide pipe 5 is attached to the tow line 4, and the lining pig 3 for painting the inner surface of the resin is attached to the rear side of the lead pig 2. Is wound up by a winch device 8 to provide a repair resin C arranged in front of the lining pig 3.
And the lining pig 3 coats the inner surface of the pipe and the inner surface of the pipe joint portion with a thin film resin. Here, as shown in FIG. 5, the preceding pig 2 alternately joins a plurality of body portions 21 made of a soft elastic body and a plurality of fin pieces 22 made of a hard elastic body that airtightly contacts the inner surface of the pipe. However, the front and rear are tightened with stud bolts or the like and integrally fixed, and the tow cable 4 is slidably inserted into the hole 23 penetrating the central portion of the pipe, and at the same time with respect to the inner surface of the pipe. Moves with a predetermined resistance and repair resin C behind
Appropriate pressure is applied to. Further, as shown in FIG. 4, the lining pig 3 attached to the end of the tow line 4 includes a front part 31 formed of, for example, a single-cell sponge, and a rear part 32 formed of sponge having an open-cell structure or the like. The front portion 13 is formed to have an outer diameter smaller than the inner diameter of the pipe, and a large number of protrusions 33 for clearance setting, which have substantially the same diameter as the inner diameter of the pipe, are arranged on the outer periphery of the front portion 13 substantially evenly. The rear portion 32 is formed to have a diameter larger than the inner diameter of the tube. Therefore, when the lining pig 3 is inserted into the pipe, the rear portion 32 is inserted with the diameter reduced to the pipe inner diameter, and the pipe joint portion is pulled by the tow line 4 to move inside the pipe.
When reaching a portion with a large pipe diameter such as 13, the rear portion 32 swells due to the open-cell structure and the resin in front enters into the gap of the pipe joint portion 13, and the air retained in the gap is moved backward. It has a replacement function of discharging the resin C and the resin C
The diameter of the rear portion 32 is reduced again when the lining pig 3 leaves the pipe joint portion 13, and the resin is applied to the inner surface of the pipe. On the other hand, the guide pipe 5 connected to one side of the underground pipe 1 is provided with a resin filling port 5a having an opening / closing cock 52, and an exhaust port having an opening / closing cock 53 at a higher level position. The portion 5b is provided, and the resin filling mouth portion is provided.
5a communicates with the resin filling tank 7 via a hose 7a. Here, the filling pressure to the resin filling tank 7 is the generator
It is supplied from a small compressor 7c by driving 7b. Next, a method of repairing the underground pipeline will be described based on the above configuration. First, the winch 8 winds up the tow line 4, so that the leading pig 2 through which the tow line 4 penetrates is inserted into the pipe, and subsequently, the lining pig 3 is inserted into the pipe. At the time of inserting the lining pig 3, a predetermined amount of resin C required for repair, such as applying a thin film resin in the gap of the pipe joint portion 13 and the pipe inner surface, is provided between the preceding pig 2 and the lining pig 3. Is filled. Next, when the lining pig 3 is towed by the towing operation of the tow cable 4, the resin C moves from the rear side to the lining pig 3
While being pushed by, the resin pressure is increased by the viscous resistance of the resin and the leading pig 2, and the resin C is supplied to the rear portion 32 through the protrusions 33 of the front portion 31 of the lining pig 3.
The resin is applied in a thin film form on the outer peripheral surface of the rear part of the rear part and proceeds. Then, the lining pig 3 reaches the pipe joint portion 13, and as shown in FIG.
At the moment of entering the large-diameter gap part, the outer diameter of the rear part 32 swells, the resin C enters the gap, and the air staying in the gap is discharged rearward by the continuous bubble structure to remove the resin C. It is applied to the inner surface of the pipe joint portion 13. Subsequently, the lining pig 3 moves, the rear portion 32 leaves the pipe joint portion 13 and the diameter is reduced again, and then the coating of the inner surface of the pipe is continued. As the method of repairing the inner surface of the pipe by the lining pig 3 progresses, the resin amount decreases and the resin pressure also decreases, but the resin C is pressed from the front by the leading pig 2 that is slidable with respect to the tow line 4. Therefore, the resin is uniformly coated over the entire length of the repair section without being extremely deteriorated.

【The invention's effect】

As described above in detail, according to the method for repairing the inner surface of the pipe according to the present invention, the resin arranged in front of the lining pig that is towed by the tow line is pressurized at the front part of the lining pig, and When it reaches the joint, the rear part of the lining pig expands and enters the gap of the pipe joint,
The resin enters the gap and discharges the stagnant air in the gap to the rear so that the resin can be applied inside the gap, so even if there is a pipe joint in the repair section of the underground pipeline, The resin is continuously and evenly coated for leakage repair or preventive maintenance. Further, the rear portion of the lining pig according to the present invention has an open-cell structure, has a substitution function of discharging the air staying in the gap of the pipe joint portion and applying the resin, and is a simple repair device. This enables effective repair of the pipe inner surface.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an essential part schematically showing one section of repair work according to the present invention, and FIG. 2 shows a method of repairing an underground conduit which is an essential part of FIG. FIG. 3 is an enlarged sectional view, FIG. 3 is a sectional view of an essential part showing a repairing method for a pipe joint portion according to the present invention, FIG. 4 is a side view in which a lining pig according to the present invention is partially broken, and FIG. It is the side view which a pig was partially broken. 1 ... Underground pipeline, 2 ... leading pig, 3 ... lining pig, 4 ... tow line, 5,6 ... guide pipe, 8 ... winch device, 11,12 ... both ends open, 13 ... … Pipe fittings, 31 ……
Front, 32 ... rear, A, B ... manhole, C ... resin.

Front Page Continuation (72) Inventor Toshio Nakagawa 4-18-3 Daikan, Yamato City, Kanagawa Pref. Within Hakko Development Laboratory Co., Ltd. (56) References JP-A-60-87039 (JP, A) JP-A-61 -149692 (JP, A)

Claims (2)

(57) [Claims] 1. An underground pipe which is laid underground between manholes and is inserted from one end to the other of both ends of an empty pipe to repair the inner surface of the pipe including the pipe joint portion. A repair device for a road, which has an inner surface of a pipe and a front part in which a large number of projections for setting a predetermined clearance are substantially evenly arranged, and has an elastic and sponge-like structure having a diameter larger than the inner diameter of the pipe body. A lining pig having a rear portion, a towing line that pulls the lining pig from the other side of the pipe body, and the tow line is slidably inserted and is arranged in front of the lining pig, and with respect to the inner surface of the pipe. It consists of a leading pig that is airtight and movable with a predetermined resistance, and in the process of pushing the resin arranged in front of the lining pig, the leading pig pressurizes the resin and the inner surface of the pipe and the pipe. Tree in the gap of the joint An underground pipe repair device characterized by continuous application of fat. 2. A repairing method using the repair device for an underground pipe according to claim 1, wherein the preceding pig is inserted from one of the pipe bodies and the lining pig is reduced in diameter at a rear portion thereof. Inserted, at that time filled the required amount of resin between the preceding pig and the lining pig, and arranged in front of the lining pig by pulling the tow line from one side of the pipe to the other A method for repairing an underground pipeline, characterized in that, in the process of pushing the resin, the resin is continuously applied to the inner surface of the pipe body and the gap between the pipe joint portions.