JP2688757B2 - Underground pipeline repair device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

INDUSTRIAL APPLICABILITY The present invention relates to a pipe joint portion of a pipe body that is an empty pipe among a plurality of rows of underground pipes that form a cable drawing pipe for wiring a cable for telecommunications or the like underground between manholes. The present invention relates to a repair device for an underground pipe, which repairs the pipe inner surface before and after the pipe inner surface while being installed.

[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 line is constructed by arranging in multiple rows and laying under the road or the like to construct a pipeline. Cables to be laid are installed by selecting an arbitrary pipeline that is an empty pipeline. The method is 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 joint condition 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 and a pig device for pushing the resin from the rear are inserted into the inner surface of the pipe, and the pig device is used. There is a type in which a resin lining layer having a predetermined thickness is formed on the inner surface of the pipe by drawing the lining resin with a predetermined viscosity from the gap between the outer circumference of the pig and the inner wall surface of the pipe to the rear side of the pig by pulling it with a tow line. Further, as shown in JP-A-61-149691 and JP-A-61-149692, a lining portion is formed through an annular recess at the rear portion of the replacement portion that is in airtight contact with the inner surface of the tubular body and slides. By pulling the pig, the resin placed on the front side of the pig is pushed from the rear while filling the resin in the gap of the pipe joint part, and the pipe inner surface before and after the pipe joint part is lined with resin. Proposed.

[Problems to be solved by the invention]

By the way, in the conventional pipe repair method, if the amount of resin placed in front of the pig is too small, it will not be possible to supply the resin evenly to the pig. There is a problem that the filling becomes uneven and the resin supplied to the lining portion is pressurized and supplied together with the air flow, so that the resin supply becomes uneven and uniform lining cannot be performed.

[Object of the invention]

The present invention has been proposed to solve the above-mentioned problems, and in a plurality of rows of underground pipes, when repairing the inner surface of the pipe while the pipe body that is an empty pipe is installed, If there is a pipe joint in the repair section of the pipe, first, the preceding pig that uniformly pressurizes the resin, the replacement pig that fills the pipe joint with the resin, and the pipe inner surface before and after the pipe joint The lining pig that forms the resin lining layer is connected to
While pulling these pigs with a tow cable, the resin placed in front of the replacement pig can be used to simultaneously perform the resin filling process for the pipe joint part and the resin lining process for the inner surface of the pipe. A repair device is provided.

[Means for Solving the Problems]

In order to achieve the above object, according to the present invention, the pipe joint portion of the pipe body, which is laid underground between manholes, is inserted from one end to the other end of the pipe body which is an empty pipe. And a device for repairing an underground conduit that repairs the inner surface of a pipe within a predetermined range before and after the pipe, which is pulled from the other end of the pipe by a tow line and conveyed to the pipe joint portion, and pushes the resin in front along the pipe. The replacement pig that fills the resin in the gap of the pipe joint portion in the process of moving, and the replacement pig that is placed in front of the replacement pig and makes airtight contact with the inner surface of the pipe, and is slidable with respect to the tow line and the rear resin. A leading pig that pressurizes with the pulling of the replacement pig, and a lining that is connected to the rear of the replacement pig and lining the resin that has flowed out to the rear of the replacement pig onto the inner surface of the pipe in a predetermined range before and after the pipe joint portion. Equipped with a pig,
It is characterized in that the line pig is provided with an air vent pipe for exhausting air that has flowed out to the rear of the replacement pig rearward.

[Action]

Based on the above means, in the repair device for an underground pipe according to the present invention, the guide pipe is connected to both end opening ports of the pipe body that is laid underground between manholes and is an empty pipe, and one of the guide pipes From the tow line that has been inserted from the other to, in the process of sequentially inserting the replacement pig and the lining pig subsequent to the preceding pig, while pressing the resin arranged in front of the replacement pig with the preceding pig, The process of filling the resin in the gap of the pipe joint existing in the repair section and making the air between the replacement pig and the lining pig behind the lining pig to almost atmospheric pressure, and the pipe inner surface before and after the pipe joint The step of forming a resin lining layer is simultaneously performed, and stable and reliable resin filling and constant lining can be performed.

【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. Is a perspective view of the replacement pig according to the present invention, and FIG. 4 is a rear perspective view showing the relationship between the replacement pig and the lining pig. In the drawing, reference numeral 1 is an underground conduit 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 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 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 cable 14 is inserted from the one end side guide tube 5 of the underground conduit 1 toward the other end side guide tube 6, and the tip end of this tow cable 14 is pulled out from the other end side guide tube 6 to form a pulley 15a, 15b
It is made to be circumvented via the and is wound around the winch device 8 installed on the worker 16 or the like. Further, the leading pig 2, which is inserted into the duct from the guide pipe 5, hermetically contacts the inner surface of the underground conduit 1 at the tow line 14, and is movably inserted into the tow line 14. Subsequent to 2, the replacement pig 3 and the lining pig 4 are connected to each other with a predetermined space therebetween. Here, as shown in FIG. 5, the preceding pig 2 has a plurality of body portions 21 made of a soft elastic body such as hard neoprene sponge and a plurality of fin pieces 22 made of a hard elastic body such as neoprene rubber. While alternately joining, a frustoconical head 23 made of a hard elastic body is arranged on the front side in the traveling direction,
The front and back are tightened with stud bolts, etc., and the head 23 and body 2
1, the fin piece 22 is integrally fixed. Further, as shown in FIG. 3, the replacement pig 3, which is connected to the pulling line 14a following the preceding pig 2, has a truncated cone-shaped head 31 made of a hard elastic body on the front end side in the traveling direction, A body tip 32 made of a soft elastic body and a columnar body 33 following the body 32 are connected, and a rear body 34 of the soft elastic body and a fin piece 35 of a hard elastic body are alternately connected to the rear portion. Since it is necessary to provide a resin replacement function, the outer peripheral portion of the body portion 33 is provided with resin introducing grooves 17 communicating with the front side in the traveling direction at the left and right outer peripheral wall positions of the pig. Then
In parallel with this, the body portion 33 is changed in position so that the resin introduction groove 17 and the axially opposite ends thereof overlap each other and do not communicate with each other in the circumferential direction. Are formed on the upper and lower outer peripheral wall positions of the pig. The replacement groove 18 is provided with a passage 19 such as a polyethylene tube embedded in the pig so as to open at the rear end of the pig. Further, the lining pig 4 connected to the replacement pig 3 by the tow line 14b is provided with a plurality of radial projections 42 on the outer periphery of the body portion 41 in contact with the pipe in an airtight manner along the traveling direction. The lining portion 43 is formed at the rear portion and has an outer diameter that maintains a predetermined lining gap with the inner wall of the pipe. The resin that has flowed through the ridges 42 of the lining pig 4 to the rear portion is provided. Is applied to the inner wall surface of the pipe by the lining portion 43 to form a lining layer. On the other hand, on the rear end surface of the replacement pig 3, an annular recess 36 is formed on the outer peripheral side of the passage 19, and a predetermined position of the rear lining pig 4 is formed in the annular recess 36. The tip portion 44 of the air vent pipe 44 that penetrates and extends forward
a comes to fit. The tip portion 44a of the air bleeding pipe 44 is bent in a U shape so that resin does not enter, and an opening portion is formed in the middle, or the tip portion 44a is formed short without extending to the replacement pig 3. Anything is fine. Further, the guide pipe 5 connected to the one end side opening 11 of the underground pipe 1 has a resin filling mouth portion having an opening / closing cock 52.
5a is provided, and an exhaust port 5b having an opening / closing cock 53 is provided at a higher level position, and the resin filling port 5a is connected to the resin filling tank 7 via a hose 7a. There is. The filling pressure in the resin filling tank 7 is given from the small compressor 7c by driving the generator 7b. Next, a method of repairing an underground pipe with the repair device configured as described above will be described. First, by winding the tow cable 14 inserted into the underground conduit 1 by the winch 8, the leading pig 2, the replacement pig 3, and the lining pig 4 attached to this tow cable 14 are inserted into the pipe. . Here, between the preceding pig 2 and the replacement pig 3, a predetermined amount of resin C, which is the amount of resin filled in the gap of the pipe joint portion 13 in the repair section L, is filled in the guide pipe 5. It is filled from the mouth part 5a. Next, when the tow line 14 is pulled, the leading pig 2 slides against the tow line 14 by hermetically contacting the fin piece 22 with the inner circumferential surface of the pipe, and moves while pressing the resin C in front of the replacement pig 3. . When the replacement pig 3 reaches the position of the pipe joint portion 13, a sufficient filling pressure is generated due to the viscous resistance of the resin C and the pressing of the preceding pig 2, so that the resin C is not grooved in the groove of the replacement pig 3.
The gap from the pipe joint portion 13 is filled from 17 with stability and reliability. Here, the air staying in the gap of the pipe joint portion 13 is pushed out to the rear part of the replacement pig 3 from the groove 18 through the passage 19 together with the excess resin, and the air therein passes through the lining pig 4. The resin C is discharged rearward from the air vent pipe 44 and is made to have an atmospheric pressure substantially equal to the atmospheric pressure, and flows out from the replacement pig 3 to the front of the lining pig 4.
The lining pig 4 that moves from the rear of the replacement pig 3 lining the pipe inner surface of the pipe joint portion 13 at a constant position forms a lining layer having a predetermined thickness. In addition, from the rear of the replacement pig 3, the air vent pipe 44
Since the air staying in the gap of the pipe joint portion 13 is discharged to the rear of the lining pig 4 through the, the replacement function of the pipe joint portion 13 is sufficiently retained, and the resin behind the replacement pig 3 is The movement and the supply of the resin to the lining pig are smoothly performed.

【The invention's effect】

As described in detail above, according to the present invention, the preceding pig that presses the resin behind, the replacement pig that fills the pipe joint portion with the resin, and the lining pig that forms the lining layer before and after the pipe inner surface are provided. While being connected at a predetermined interval, the lining pig has a configuration in which an air vent pipe for exhausting air behind the replacement pig is penetrated,
It is possible to reliably and stably send the resin to the pipe joint portion in the repair section to discharge the air in the pipe joint portion and perform replacement filling. Further, the resin discharged to the rear of the displacement pig together with the air in the pipe joint portion is lined to the inner surface of the pipe by the lining pig in a state close to the atmospheric pressure to form a lining layer having a certain thickness, and the front and rear portions of the pipe joint portion are formed. The inner surface of the pipe can be lined uniformly.

[Brief description of the 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. Is a perspective view of the replacement pig according to the present invention, FIG. 4 is a rear perspective view showing the relationship between the replacement pig and the lining pig, and FIG. 5 is a side view of the leading pig. 1 ... Underground pipeline, 2 ... Leading pig, 3 ... Replacement pig, 4
…… Exclusion pig, 5,6 …… Guide pipe, 8 …… Winch device, 11,12 …… Both ends opening, 13 …… Pipe joint part, 14 …… Tow line, 17,18 …… Slot, 19 ...... passage, 36 ...... annular recess, 44 ...... air vent pipe, A, B ...... manhole, C ...
…resin.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshio Nakagawa 3-18-18 Daikan, Yamato-shi, Kanagawa 4 Within HAKKO Development Technology Laboratory Co., Ltd.

Claims (1)

(57) [Claims] 1. A pipe joint which is laid underground between manholes and which is an empty pipe, is inserted from one end to the other of both ends, and a pipe joint portion of the pipe body and a pipe inner surface within a predetermined range before and after the pipe joint portion. An underground pipe repair device for repairing a pipe, which is pulled from the other side of the pipe body by a tow line and conveyed to the pipe joint portion, and in the process of pushing the resin in front along the pipe, A replacement pig that fills the gap with resin, and a replacement pig that is placed in front of the replacement pig and has an outer periphery in airtight contact with the inner surface of the pipe. A preceding pig to be pressurized and a lining pig that is connected to the rear of the replacement pig and is lined with the resin flowing out to the rear of the replacement pig on the inner surface of the pipe in a predetermined range before and after the pipe joint portion. , Spilled to the rear of the replacement pig An underground pipe repairing device, characterized in that it is provided through an air vent pipe that discharges the generated air backward.