JPH01255414A - Repair work for underground conduit line - Google Patents

Abstract

PURPOSE:To perform repair work economically and in a short time, by providing an air vent capable of opening and closing to a carrier pig to move resin. CONSTITUTION:A lining pig 2 and a resin carrier pig 3 are arranged in the underground conduit line 1 movably in the direction of a pipe length through tracting lanyards 14 and 15. Between these pigs 2 and 3 resin C is filed up. An air vent 4 is provided to the resin carrier pig 3 which passes through in the moving direction back and forth. The resin C is carried by a resin carrier pig 3 with this air vent closed when the lining pig 2 is moved in front, while when the carrier pig 3 is moved in front, the air vent 4 is opened to keep the front of the resin C at atmospheric pressure and to perform lining with the lining pig 2.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention is directed to underground pipes that are empty among multiple rows of underground pipes that form cable lead-in pipes for wiring telecommunications cables underground between manholes. This invention relates to a repair method for underground pipes in which only the parts of the pipe body that require repair are repaired from the inside of the pipe while it is still installed. [Prior Art] Conventionally, underground conduits for wiring communication cables, etc., which have been laid underground between manholes, usually have multiple pipe bodies running up and down between vertical holes such as manholes. The conduit consists of multiple stages and multiple rows arranged on the left and right and laid underground under roads, etc., so select any empty conduit for the cables, etc. to be routed. A method of retracting and laying the cables is adopted. By the way, the tube body of the underground conduit installed in ① is made by connecting steel pipes or cast iron pipes with pipe joints, and over time, chains form in the tube body and spread inside the pipe, causing "knob-like" formations. The effective diameter of the pipe may be reduced due to the deterioration of the sealing material, or the connection condition of the pipe joint may change due to the load of the vehicle, vibration, earthquake, etc. hand,
Gaps form in the pipe joints, allowing foreign matter such as water and dirt to enter and block the pipes.In the near future, the underground pipes may become unable to be inserted when trying to install a new cable. It is being considered to repair empty pipes from the inside of the pipes while they are still installed. As a repair method for this pipe body, after removing and cleaning foreign objects inside the pipe, a lining pig, etc., which opens the lining gap between the inside of the pipe body is pulled, and the resin placed on the front side of the pig is removed. It is generally known that the inner surface of the tube is lined with resin from the rearward push-in λ. (Problems to be Solved by the Invention) By the way, when repairing a pipe body using the conventional Ii method, the resin is placed in front of the lining pig in the moving direction from one end to the other end of the repaired section of a predetermined length. Because the resin and the pig are moved while resisting the viscous resistance, the moving speed of the resin and the pig is inevitably limited, making it impossible to carry out highly efficient repair work. In addition, underground pipes between manholes are generally damaged in parts relatively close to the manholes (for example, the back manhole with a total length of 100 m has a lot of damage, so BA repairs are sufficient to achieve the purpose). In many cases, conventional construction methods are suitable for repairing the entire length of underground pipes between manholes; Since it was difficult to do so, even parts that did not require repair had to be lined with resin, creating an economical problem as it consumed extra resin and construction time. [Means for Solving Problem 1] The present invention has been proposed to solve the above-mentioned problems, and is intended to solve the problems described above. In the method for repairing ground 1S pipes by lining with resin, a lining pig is placed in the pipe under the pond so as to be movable in the length direction of the pipe via a towing cable, and this lining pig is A transporting pig is provided which is moved by a tow cable at a predetermined interval from the lining pig, and which moves the resin placed between the lining pig and the lining pig. It has one ventilation hole in the model, and when it is moved through this ventilation hole with the lining pig on the front side, the resin is conveyed with the conveying pig in 111 chains, and when it is moved with the conveying pig on the front side. In the method of repairing underground pipelines using means L, it is important to install a valve body that is opened and the front of the resin is exposed to the atmosphere [1] and lined with a lining pig. When moving the lining pig with the front side, the transport pig moves the 4!'jlli to the repair area without loss with the ventilation hole closed by the valve body. When moving, the ventilation hole of the transporting pig is opened, and even if the resin is consumed by the lining and the length of the resin is shortened, the pressure in front of the resin does not become 1 pressure, and the lining pig is kept at atmospheric pressure. Since only the parts that require repair are selected and lined with resin, the number of parts and resin required for repair is reduced, making it possible to repair economically at low cost. Monkey.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings labeled g1. Figure 1 schematically shows a section of repair work according to the present invention.
A sectional view of the main part, Fig. 2 (A), a sectional view of the main part showing the repair method of the No. 0) Yokoji T/pipe line, Fig. 3 (0, σD is another example of the resin conveying pig) Figure 4 is a side view of another embodiment of the repair method.
1 is an underground conduit that needs to be repaired. This underground conduit 1 is usually made of steel pipes or cast iron pipes with a diameter of 50111-100111 connected to a predetermined length by a plurality of pipe joints 13, and the plurality of pipes are connected to a predetermined Tn setting. They are arranged in clusters on the upper F, ji, right at intervals, and form an underground pipe laid underground with manhole A, [31,: page]. Telecommunications cables are inserted into this underground conduit 1, and empty conduit lines in which no cables are inserted are to be repaired behind multiple rows of conduit lines. When repairing the empty pipe of the underground pipe 1, the distance between the manholes Δ and B, which are the open ports 11.12 at both ends of the underground pipe 1, is taken as a repair unit of one section.
A winch device for towing cables 14 and 15, each of which is connected to a guide pipe 6.7 and inserted into the underground conduit 1 through the guide pipe 6.1 above the ground of each manhole A, B, respectively. Work vehicles 21.22 equipped with 8.9 are arranged. In addition, the tips of the towing cables 14 and 15 inserted from the guide tube 6.7 side are respectively detoured through the full vehicles 23 and 24 to reach the winch devices 8 and 15 of the working vehicles 21 and 22, respectively.
The resin lining pig 2 is movably connected to the tow rope 15, which is inserted into the guide tube 6 side preferentially from the guide tube 6 side. J. At the rear of the resin lining pig 2, a resin transporting pig 3 is attached via a connecting wire 10, having a predetermined distance from the pig 2 and in airtight contact with the inner surface of the underground pipe 1. A tow line 14 is fixed to the rear of the pig 3. Further, the resin transporting pig 3 is provided with a ventilation hole 4 that penetrates in the front-rear direction, and when moving with the lining pig 2 on the front side, this ventilation hole 4 is closed, and the transporting pig A valve plate 5 that opens the valve plate 5 when moving with the valve 3 facing forward is slidably numbered. The towing cable 15 is pulled by the winch device 9 on the guide tube 1 side, and the guide t! Pig 2 for resin lining from the 6th side
When inserting the transporting pig 3 into the pipe, the space between the two pigs 2 and 3 is filled with a repair resin C that has been prepared in advance to a predetermined viscosity. type of resin, the flea resin necessary for lining the required repair area is injected. Next, a description will be given of the work order of the underground pipe repair method using the repair equipment of the present invention configured as described above. First, guide pipes 6 and 7 are connected to the open ends 011 and 12 of the two repaired pipes of the underground pipe 1 in the repair section laid between the phases ηi of manholes A and B, respectively. The resin lining pig 2 and the transporting pig 3 are inserted through the guide tube 6 by winding up the tow rope 15 inserted from the guide tube 7 side via the winch device 9. At this time, a predetermined repair resin C is filled in advance between the two pigs 2 and 3. Furthermore, when the tow rope 15 is pulled, as shown in FIGS. 2(a) and 3(a), the valve plate 5 opens and closes the vent hole 4 due to the resin conveyance resistance, and the outer periphery of the resin C It is transported forward without loss by a transporting pig that is in airtight contact with the inner surface of the conduit 1. The towing cable 14 fixed to the rear of the transport pig 3 is connected to the winch i! on the guide pipe 6 side. It is wound around the device 8 so that it can be freely fed out. By winding up the E insignia index 15, the lining pig 2
However, when the distance scale marked on the tow rope 14 reaches the point where repairs are to be made in the underground pipe 1, as shown in Fig. 2 (2)
As shown in , the winding operation of the winch device 9 is immediately stopped, the tow rope 15 is removed from the lining pig 2, the winch device 8 is driven, and the tow rope 14 is wound in the opposite direction. By winding up the tow rope 14, the resin C, which had been pushed by the transporting pig 3, is now pushed by the lining pig 2, thereby lining the inner surface of the conduit 1 with resin. At this time, the ventilation hole 4 of the transport pig 3
is opened by moving the valve body 5 backward in the moving direction,
Due to the lining, the pressure in front of the resin C does not become negative even if the resin decreases, and the pressure can always be maintained at atmospheric pressure. Therefore, uniform resin lining can be performed depending on the size of the resin C on the front side of the lining pig 2. Furthermore, in order to prevent the resin gap from being consumed by the lining and reducing the resin pressure and the lining film thickness, the forward pressure is adjusted from the guide tube 6 side as necessary to ensure uniform lining. It can be carried out. ffI 3 (+) As shown in the figure, the valve body 5 of the transport pig 3 is constructed so that the valve (45
may be actively released. In addition, as shown in Fig. 4, the correction L'la place is the man small
When at a relatively long distance from the side edge, the winch 9. Tow rope 1! ] may be omitted and the manhole A (A) may be pushed in from the manhole A (III1) using, for example, an Ot rod 25 with split bamboo that can be added.

【Effect of the invention】

As explained above, according to the method for repairing underground pipes according to the present invention, it is possible to perform partial resin lining of the parts of the underground pipe laid in the manhole phase IZ that require repair, Since lining is not applied to unnecessary areas, repair work can be carried out economically and efficiently. In addition, in the repair method according to the present invention, the ventilation hole of the transporting pig is released at the time of resin lining, so that the required forward pressure can be applied to the lining resin of the lining pig. The key is to line evenly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part schematically showing a section of repair work according to the present invention, Fig. 2 (A), θ F is a sectional view of the main part showing the repair method for underground pipes, and Fig. 3 Figures (0 and (2) are cross-sectional views showing other embodiments of the resin conveying pig, and Figure 4 is a side view showing another embodiment of the repair method. 1...Ground f pipe, 2 ...a1118 lining pig, 3...resin transport pig, 4...ventilation hole, 5...
・Valve plate, 6゜7...Guide pipe, 8.9...Windge device, It, 12...Both ends open port, 13...Pipe joint part, 14.15...Folding cable , 21゜22...work vehicle, 25...ro! ~ Bar, A, [3... Manhole. Special γ [Applicant: Nippon Telegraph and Telephone Corporation
Hakko Co., Ltd. Agent Patent attorney Nobuki Kobashi

Claims (1)

[Claims] An underground pipeline repair method in which the inner surface of an underground pipeline installed underground between manholes is repaired by lining it with resin, A lining pig is arranged so as to be movable in the length direction of the pipe, and a transporting pig is moved by a towing cable at a predetermined distance from the lining pig to move the resin placed between it and the lining pig. The transporting pig has a ventilation hole that is in airtight contact with the inner surface of the pipe and penetrates back and forth in the direction of movement of the pig,
When moving with the lining pig in the front, it is closed and the resin is moved by the transport pig, and when it is moved with the transport pig in the front, it is opened to create atmospheric pressure in front of the resin and the lining pig is used to lining the resin. A method for repairing underground pipelines, characterized by providing a valve body designed to do so.