JP2688755B2 - Underground pipeline repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention requires repair of empty pipes among a plurality of rows of underground conduits that form cable entry conduits for routing telecommunication cables and the like underground between manholes. The present invention relates to a method of repairing an underground pipeline in which only the part to be repaired is repaired from the inner surface of the pipe while being laid.

[Prior art]

Conventionally, underground pipes for wiring telecommunications cables, etc. that are laid underground underground between manholes usually consist of multiple pipes, and they are arranged in multiple levels vertically and horizontally across the hard holes such as manholes. A system in which multiple lines are aggregated and laid under the road or the like to form a pipeline, and the cables to be wired are installed by pulling in any pipeline that is an empty pipeline. Is taken. By the way, the pipe body of the existing underground pipeline is made by connecting steel pipes or cast iron pipes by pipe joints, and rust develops in the pipe body over time and spreads inside the pipe, forming a "hump-like shape". If the effective diameter of the pipe is reduced, or the joint condition of the pipe joint changes due to the deterioration of the sealing material, the load of vehicles passing on the pipe, vibration, earthquake, etc., a gap is created in the pipe joint. Since foreign matter such as water or earth and sand may enter and block the pipeline, it may become impossible to insert a new cable.Therefore, an empty pipe in the underground pipeline has recently been installed. It is considered to repair the inner surface of the pipe as it is. As a repairing method for this pipe body, after removing foreign matter in the pipe and cleaning it, pull the lining pig that has a running gap between it and the inner surface of the pipe body to remove the resin placed on the front side of the pig. It is generally known that the inner surface is lined with resin while being pushed from the rear.

[Problems to be solved by the invention]

By the way, in the pipe repair method according to the conventional method,
From one end to the other end within the repair section of the specified length, the resin placed in front of the moving direction of the lining pig is moved while resisting its viscous resistance, so the moving speed of the resin and the pig is necessarily limited. However, there was a problem that highly efficient repair work could not be performed. In addition, the underground pipeline between manholes may not be damaged in its entirety, and for example, a part close to the manhole or only a small part of the whole may be damaged. In many cases, the purpose is achieved by repairing only the necessary repair parts without repairing the entire pipeline, and the conventional method is suitable for repairing the entire length of the underground pipeline between manholes. ,
It is difficult to repair and repair only the damaged part in the middle of the pipeline, and the resin lining is also applied to the part that does not require repair, and there is also an economic problem of consuming extra resin and construction time.

[Means for Solving the Problems]

The present invention has been proposed in order to solve the above-mentioned problems, and a repairing method for an underground pipeline, in which the inner surface of the underground pipeline installed between manholes is lined with a resin for repairing. In the underground conduit, from one manhole opening end to the other manhole opening end, a cylindrical cylinder and a lining pig filled with resin inside, a resin opened at the rear end of the cylinder. It is inserted in the front and rear so that the outflow / inflow port is located on the front side of the lining pig, and the inside of the cylinder is in contact with the inner wall of the cylinder from the front end side of the cylinder toward the resin outflow / inflow port side. Sliding,
Arrange a piston pig to let the resin in the cylinder flow out from the resin outflow / inflow port to the front side of the lining pig, and at the front part of the piston pig, through the cylinder front end part, to the other manhole opening end of the underground pipe line. An extending pig tow line is connected, a rear part of the piston pig is connected to a tow line connected to the front part of the lining pig, and the piston pig and the lining pig are connected.
When the piston pig is positioned at the front end of the cylinder, the front end surface of the lining pig is connected so as to block the resin outflow / inflow port of the cylinder, and the piston pig is positioned at the front end of the cylinder. The pig tow line penetrating the front end of the cylinder is pulled toward the other end of the manhole opening in the underground pipe, and the resin filled in the cylinder is moved to a position just before a specific repair point of the underground pipe. Then, the cylinder tow line connected to the front end of the cylinder and extending to the other end of the manhole opening of the underground pipe is pulled to slide the piston pig to the resin outflow / inflow port of the cylinder. By moving the resin in the cylinder to the front side of the lining pig from the resin outflow / inflow port,
In that state, the lining pig / piston pig and the cylinder are integrally moved to form a lining layer on the inner surface of the pipe at the repaired portion by the lining pig, and thereafter, the pulling of the cylinder pulling line is stopped, and the pig pulling line is stopped. And slide the piston pig to the front end of the cylinder again, and the excess resin existing on the front side of the lining pig flows into the cylinder through the resin outflow / inflow port by pushing the linening pig. Then, the resin is moved to the next repair location.

[Action]

In the method of repairing the underground pipeline by the above means, the resin for lining is placed on the front side of the conventional lining pig by pulling the lining pig along with the lining pig up to the point before the required repair while the cylinder is filled with the resin. Compared to the case where the resin is pushed by the pig, it moves at a speed much faster than that when it is stopped, the resin flows out from the cylinder to the front side of the lining pig, and the lining pig is used to line up and repair the required repair area. The resin is allowed to flow into the cylinder again and moved at a high speed to the next portion requiring repair.
Therefore, the repair work can be performed in a short time, and the resin required for the repair can be repaired economically and inexpensively with a small amount of resin.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of an essential part schematically showing a section of repair work according to the present invention, and FIGS. 2 (a) to (d) are sectional views of an essential part showing a method of repairing an underground pipeline, In the figure, reference numeral 1 is an underground pipe to be repaired. The underground pipe 1 is formed by connecting a steel pipe or a cast iron pipe having a diameter of usually 50 mm to 100 mm to a predetermined length L by a plurality of pipe joints 13, and a plurality of pipes are vertically arranged at predetermined intervals.
They are collectively arranged on the left and right, and form an underground conduit laid underground over manholes A and B. A cable for telecommunications is inserted into the underground conduit 1. The underground conduit 1 is used to repair an empty conduit through which no cable is inserted among a plurality of rows of conduits. When repairing the empty pipe of the underground conduit 1, the space between the manholes A and B, which are the open ends 11 and 12 of the underground conduit 1, is defined as a repair unit L of one section, and the open ends 11 and 12 are respectively provided at both ends. Guide pipes 6 and 7 are connected and on the ground of each manhole A and B,
Work vehicles 21 and 2 equipped with winch devices 8 and 9 for towing lines 14 and 15 inserted into the underground pipeline 1 via guide tubes 6 and 7, respectively.
2 is arranged. That is, the towing line 1 inserted from the guide pipes 6 and 7 side
The tips of 4 and 15 are bypassed via pulleys 23 and 24, respectively, and are wound around the winch devices 8 and 9 of the work vehicles 21 and 22. The tow line 14 is inserted into the pipe from the guide pipe 7 side. The front portion of the piston pig 4 among the lining pig 2, the cylinder 3, and the piston pig 4 that are to be connected is connected. A resin injection cylinder 3 is provided on the front side of the lining pig 2. This cylinder 3 has a guide 3a having a resin outflow / inflow port 3b on the outer peripheral portion of the open rear end, the outer surface of which is in airtight contact with the inner surface of the pipe and which can be joined and separated from the conical tip of the lining pig 2 toward the inside of the cylinder. And a piston pig 4 that slides in the cylinder 3 is connected to a tow line 14 that extends through the front end of the cylinder. Between the rear end of the piston pig 4 sliding in the cylinder 3 and the tip of the lining pig 2, the tip of the piston pig 4 contacts the front end of the cylinder 3, and the guide 3a is joined to the tip of the lining pig 2. Are connected by a connecting wire 10. A cylinder index line 14a extending in the same direction as the tow line 14 and wound by a winch device different from the tow line 14 is connected to the front end of the cylinder 3. The index line 15 may be connected to or removed from the rear portion of the lining pig 2. Then, the cylinder 3 is filled with a repairing resin C prepared in advance to have a predetermined viscosity,
With this resin, the piston pig 4 moves to the front end side of the cylinder 3. Next, a description will be given of an operation sequence of a method of repairing an underground pipe by the repair apparatus of the present invention configured as described above. First, the guide pipes 6 and 7 are connected to the both end openings 11 and 12 of the empty pipe to be repaired in the underground pipe 1 in the repair section L laid between the manholes A and B, respectively. By winding the tow cable 14 inserted from the guide tube 7 side through the winch device 8, the lining pig 2 is inserted from the guide tube 7 in front of the cylinder 3. At this time, as shown in FIG. 2A, the piston pig 4 is at the front end position of the cylinder 3 filled with the resin C, and the connecting wire 10
The lining pig 2 is pulled via the, and the tip 3 of the pig 2 moves with the guide 3a joined thereto. Further, the cylinder towing line 14a is wound at a speed almost equal to that of the towing line 14 in a slackened state. When the tow cable 15 is connected to the rear portion of the lining pig 2, the tow cable 15 is wound around the winch device 9 on the guide tube 7 side so that it can be drawn out. When the lining pig 2 reaches the portion of the underground pipeline 1 that requires repair by winding the tow line 14,
Immediately stop the winding operation of the winch device 8 and
The winch device for winding 14a is driven to wind the tow line 14a. By winding the tow line 14a, the cylinder 3 is pulled and moved as shown in Fig. 2 (b), and the resin in the cylinder 3 is pushed by the piston pig 4 that is stopped, so that the resin outflow / flow is prevented. It flows out from the inlet 3b to the front side of the lining pig 2. In this state, when the cylinder 3 is further pulled by the tow line 14a, the rear end of the piston pig 4 is moved to the guide 3a.
2 and the lining pig 2 is pulled by the connecting wire 10 and the resin C is lined on the inner surface of the repaired portion of the conduit 1 as shown in FIG. When the lining repair of one repair point is completed,
As shown in FIG. 2D, when the towing line 4a is stopped to be pulled and the towing line 14 is pulled, the resin C on the front side of the lining pig 2 is pulled.
Is pushed by the lining pig 2 and is accommodated in the cylinder 3 through the resin outflow / inflow port 3b, and is moved to the next portion to be repaired to perform the same repair work. The moving speed of the cylinder 3 and the lining pig 2 by the tow line 14 is
The resin is moved at a much higher speed than the case where the resin is arranged on the front side of the conventional lining pig and the resin is pushed by the lining pig. Further, when the cylinder 3 is towed by the tow line 14a, the winch device 9 may be braked in a state where the tow line 15 is connected to the lining pig 2 in order to prevent the lining pig 2 from moving.

【The invention's effect】

As described above, in the method for repairing an underground pipe according to the present invention, the resin lining on the inner surface of the pipe in the repair section between manholes is placed on the front side of the lining pig and the resin is pushed by the pig. Compared with the conventional construction method in which all pipe inner surfaces are moved while moving, it is possible to select and repair only the pipe inner surface that needs repair, and the equipment can be moved in a short time and It is economical because the time is drastically shortened and the amount of resin used can be reduced. Further, in the repair method according to the present invention, the amount of resin to be lined on the inner surface of the pipe in the repair section is injected into the cylinder in advance, and it is not necessary to dispose extra resin in front of the lining pig. It is economical with no waste, and the resin is made to flow out by the piston pig and is made to flow into the cylinder by the lining pig, so that the resin can be properly treated in the pipe.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part schematically showing a section of repair work according to the present invention, and FIGS. 2 (a) to (d) are cross-sectional views sequentially showing work steps of a repairing method for an underground pipeline. . 1 …… Underground pipe, 2 …… lining pig, 3 …… cylinder, 3a …… guide, 3b …… resin outflow / inlet, 4 …… piston pig, 6,7 …… guide pipe, 8,9 …… Winch device,
10 …… Connecting wire, 11,12 …… Opening both ends of the underground manhole in the manhole, 13 …… Pipe joint part, 14,15 …… Tow line, 14a…
… Cylinder tow line, 21,22 …… Work vehicle, A, B …… Manhole, C …… Repair resin.

Front Page Continuation (72) Inventor Toshio Nakagawa 4-18-3-3 Daikan, Yamato City, Kanagawa Prefecture

Claims (1)

(57) [Claims] 1. A method of repairing an underground conduit, in which a resin is lined to repair the inner surface of an underground conduit laid underground between manholes, wherein one manhole opening end is in the underground conduit. From the other to the opening end of the manhole, a cylindrical cylinder filled with resin and a lining pig are arranged so that the resin outflow / inflow port opened at the rear end of the cylinder is located on the front side of the lining pig. As shown in the figure, the resin inside the cylinder is slid from the front end side of the cylinder toward the resin outflow / inflow port side in contact with the inner wall of the cylinder. A piston pig is arranged to flow out from the inlet to the front side of the lining pig, and the front side of the piston pig penetrates the front end of the cylinder and the other manhole opening in the underground pipeline. A pig tow line extending to the rear of the piston pig, a tow line connected to the front of the lining pig is connected, the piston pig and the lining pig, the piston pig is located at the front end of the cylinder. The front end surface of the lining pig is
In a state where the piston pig is positioned at the front end of the cylinder while being connected so as to block the inflow port, the pig tow line penetrating the front end of the cylinder is directed toward the other end of the manhole opening in the underground conduit. It is pulled to move the resin filled in the cylinder to a position just before a specific repair point of the underground pipeline, and then stopped, and then connected to the front end of the cylinder and the other manhole of the underground pipeline. Pull the cylinder tow line that extends to the open end, slide the piston pig to the resin outflow / inflow port of the cylinder to let the resin in the cylinder flow out from the resin outflow / inflow port to the front side of the lining pig, and that state Then, the lining pig, piston pig and cylinder are integrally moved to form a lining layer on the inner surface of the pipe at the repair required point by the lining pig. After that, the towing of the cylinder towing line is stopped, the pig towing line is towed, the piston pig is slid again to the front end of the cylinder, and the excess resin existing on the front side of the lining pig is removed from the liner pig. Pushing it into the cylinder through the resin outflow / inflow port,
An underground pipe repair method characterized by moving resin to the next repair location.