JPS60139361A - Resin conveying pig for repairing pipe joint part of existing pipe - Google Patents

Abstract

PURPOSE:To secure replacement action and to perform the certain repairing of a pipe joint part, by parallelly providing a resin filling groove and a resin replacing groove in a phase shifted state and mounting a member for preventing groove deformation to the replacing groove. CONSTITUTION:Resin introducing grooves 17 and resin replacing grooves 18 are alternately provided to the left and right peripheral wall positions of a pig 3 in parallel in a phase shifted state and a shape holding member, which is made of a metal or hard synthetic resin having a channel shaped cross-sectional area and has large notches 43a formed at both corners thereof, is formed in the replacing groove 18. By this structure, no influence is exerted on the replacing groove even if filling pressure is applied to the resin filling groove and the expansion of the groove is generated while the opening width of the replacing groove is held to a predetermined one and the repairing of a pipe joint part is made accurate.

Description

[Detailed description of the invention] [Industrial application field]

The present invention mainly aims at repairing the flat part of a pipe joint by moving resin along the inside of the pipe and filling the gap in the pipe joint when repairing the pipe joint part of an existing pipe buried underground. This is related to a resin conveying machine.

[Prior art]

In existing gas and other pipes that are connected underground (under roads) by connecting long cast iron pipes with water-type pipe joints, the joints of the pipe joints are susceptible to the load of vehicles passing over the pipes and earthquakes. ,
Alternatively, the joint condition may change over time, creating gaps in the joint, or the constituent materials of the joint may deteriorate, causing leakage, so recently, the purpose of leak prevention or preventive maintenance has been So, are you going to leave the pipe joint part of the existing pipe buried and open it from the inside of the pipe? It is considered to be repaired. As a type of this repair method, existing underground pipes are divided into repair units of a predetermined length, and a big pipe is slid from one separated opening into the existing pipe in the repair section in airtight contact with the inner surface of the pipe. Insert it with the resin on the front side of the big,
While applying pressure to the resin from the front side in the direction of travel of the VIG, the VIG is pulled by a tow cable and moved inside the pipe toward the other separation opening. A repair method for pipe joints has been proposed in which the gaps in the joints are sequentially filled. In addition, in the above repair method, regarding the vig that moves the resin along the inside of the pipe, a groove for resin filling and a groove for replacement are provided on the circumferential surface of the vig, and the resin placed on the front side of the vig is transferred through these grooves. It has been proposed to replace and fill the gap in the joint. In this product, resin filling grooves and replacement grooves are arranged alternately on the outer circumference of the VIG with a phase shift in the circumferential direction, and when the resin conveying VIG passes the position of the pipe joint part during the movement process, is guided to the pipe joint through the resin filling groove, and on the other hand, substitutes such as air are drawn from the gap in the pipe joint by the introduction pressure of the resin.
The resin is discharged through the displacement groove to ensure that the resin permeates and fills the sealing material through the gap in the pipe joint, regardless of whether a leak phenomenon occurs at the pipe joint. This was done to ensure its sealing performance.

[Technical problem of the invention]

However, the problem here is that the resin conveying big itself is made of a flexible material such as neoprene sponge with a hardness of about 50 degrees, and the resin filling groove is filled with resin. When pressure is applied, the groove expands due to the pressure, but the other replacement groove receives this effect as a deflection of the opening.For this reason, Air may not be sufficiently discharged, and in extreme cases, the walls on both sides of the opening may come close to each other and come into contact with each other, making the displacement action impossible.

['R, Ming's purpose) The present invention has been proposed to solve the above-mentioned disadvantages, and even if filling pressure is applied to the resin filling groove, the replacement groove can resist the deflection of the resin and maintain its opening width. It is an object of the present invention to provide a resin conveying vig which can ensure operation and ensure reliable repair of pipe joints. [Structure of the invention] For this purpose, the present invention provides a resin filling groove and a replacement groove on the outer periphery, and the resin filling groove and the replacement groove are arranged so that the resin permeates into the gap of the pipe joint part during the movement process. In the device in which resin is replaced and filled between the parts, the replacement groove is equipped with a shape-retaining member that prevents the groove from deforming, so that the groove does not deform when the VIG is bent. It is something to do. 【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. Fig. 1 is a diagram schematically showing the entire repair construction equipment, and in Fig. 1, reference numeral 1 indicates an existing pipe to be repaired that is installed underground. It is a long piping system in which rounded iron pipes of the same size are connected by a pipe joint part 13 of a water supply type. When repairing the pipe joint 13 of the existing pipe 1, the existing pipe 1 is first divided into repair sections with a length suitable for the repair (for example, 100 m), and one separated end 11 is placed above ground. The other separated end 12 is exposed in the open pit A, and the other separated end 12 is exposed in the pit B also opened on the ground, and these separated ends 11
．． 12 is the S tube for inserting the VIG, which will be described later.5. Connect the VIG lead-out conduit 6. Then, the towing cable 4 is passed from one VIG insertion conduit 5 into the existing pipe 1 and pulled out from the other VIG lead-out conduit G, and the tip of this towing cable 4 is wound up with a winch 9 to perform traction. A pair of front and rear big 2 taken by cable 4
, 3 are introduced into the existing pipe 1 with low viscosity resin C placed in front of the front side big 2 and joint sealing resin placed in front of the rear side big 3, It is designed to be towed and moved from the entrance side to the exit side. As shown in an enlarged cross-sectional view in FIG. 5, the front side big 2 has a plurality of body pieces 21 that are made of soft elastic material (for example, hard neoprene sponge with a hardness of about 50 degrees).
First, a plurality of fin pieces 22 made of a hard elastic material (for example, neoprene rubber with a hardness of about 60 degrees) are joined alternately, and a cut piece 1 made of the same material as the hard elastic material is attached on the front side in the direction of movement. A conical head piece 23 is arranged,
It has a structure in which metal support disks 24.25 are placed before and after the support disks 24.25, and the stud poles 1-26 are penetrated between the front and rear support disks 24.25, and by tightening the stud bolts 2G. Body piece 21. The fin piece 221 and the head piece 23 are integrally connected in tandem so that each piece does not extend in the longitudinal direction. A hole 27 through which the tow rope 4 is passed is bored in the center, and the front pig 2 and the tow rope 4 are connected by crane buoy 1 collars 28 and 29 installed at the front and rear of the front pig 2. The above clamps (d collars 28 and 29 have bolts 28a and 29a, respectively, and collars 2L 2
The tension between the catch seats 28b and 29b which also fell into 9 (=
It has a structure in which it is fixed to the tow rope 4 with a J, and the collars 28 and 29 with clamps are preferably provided at both ends of the flexible pipe inserted into the hole 27. In addition to passing the tow rope 4 through the pipe, the pipe also functions as a passage for supplying pressurized air from the front to the rear. Note that this pressure air supply passage is provided separately.

[You can also Further, the rear big 3 according to the present invention has a hard elastic material (for example, hardness of 60 A truncated conical head piece 31 made of neoprene rubber, etc.
and a soft elastic material immediately after that (for example, a hardness of 5
A truncated cone-shaped body tip piece 32 made of a hard neoprene sponge (about 0 degrees) and a cylindrical chest piece 33 following this are connected, and a rear part made of the same material as the soft elastic material is connected to the cylindrical chest piece 33. The body piece 34 has a structure in which the hard elastic material and the fin pieces 35 made of the same material are alternately connected in tandem, and the whole body is held between support disks 30 and 37 installed at the front and rear ends. has been done. The support disks 3G and 37 are
Bolt parts 38a and 38b provided at both ends of the wire 38
The base pieces are crimped and supported together by tightening the nuts 38c and 39d. An embedded disc 39 is provided, and this embedded disc 3
The head piece 31.9I is screwed onto the bolt portion 38a with a nut 39a, and the distance between the front support disk 3G and the embedded disk 39 is regulated via the bolt portion 38a. This prevents the trunk end piece 32 from being compressed and deformed more than necessary. In addition, since the rear pig 3 is tensioned by a wire 38 in the middle, the cylindrical body piece 33, which is the main body, is restricted from elongating while moving inside the pipe, and the overall length is limited relative to the diameter. Even though it is relatively long, the flexibility of the body is ensured and the passage resistance at the curved pipe portion is reduced. In addition, since the rear side big 3 needs to have a resin replacement function, resin introduction grooves 17 are formed at the left and right outer peripheral walls of the pig, which communicate and open toward the front in the traveling direction. In addition, replacement grooves 18 are formed on the body piece 33 parallel to this at the upper and lower outer circumferential walls of the pig. The grooves 17 and 18 are tapered end walls in which each rear end wall in the direction of travel is obliquely inclined toward the rear.
7a and 18a, and the replacement groove 18 is communicated with a passage 19, such as a polyethylene dupe, buried in the pig so as to open to the rear end of the rear big 3. Moreover, in the present invention, especially regarding the above-mentioned replacement groove 18,
A shape retaining member 43 made of metal or hard synthetic resin and having a channel-shaped cross section is attached to the groove. This shape-retaining member No. 43 has large notches 43a formed at both corners in order to maintain the degree of freedom of bending in the longitudinal direction of the pig. This allows it to exhibit followability. The pigs 2 and 3 having such a configuration are inserted into the existing pipe 1 in the repair area as described in the previous section, and the low viscosity resin/C1 joint sealing resin is moved along the inside of the pipe. The purpose is to repair a plurality of pipe joints 13 interposed in the section during the movement process, and the pipe joints 13 are, for example, provided at the end of one pipe, as shown in FIGS. 4 and 9. The other tube end 131) abuts against the large diameter portion 13a, and a sealing material 14, usually called "stone surface", is placed at the butt fitting part.
It has a structure in which the opening is sealed with a lead material 15. In addition, as described above, in the existing pipe 1 to be repaired, the pig insertion conduit 5 is connected to one section 11, and the pig extraction conduit 6 is connected to the other separation@12. The conduits 5, 6 are shown enlarged in FIGS. 2 and 3. The pig insertion conduit 5 is detachably connected to the opening of one separated end 11 of the existing pipe 1 with a clamp 51, as shown in FIG. A filling part 5a is provided, and a gap cock 52 is provided there.An exhaust part 5b is provided at a slightly higher level position, and there is an opening/closing lock. 5
A resin filling tank 7 is connected to the resin filling opening 5a through the open/close lock 52 through a hose 7a, and the filling pressure to the tank 7 is as follows. Power is provided from a small compressor 7C by driving a generator 71). Further, as shown in FIG. 3, the discharge conduit 6 is provided with a discharge port 6a for discharging the residual resin, and an opening/closing hole 1 is stepped there. Further, from the discharge mouth portion 61 to the drain pipe 6, an air pressure supply port pipe (31) is provided in the conduit pipe 6. Also, a guide reel 8 guides the tow rope 4 passing through the conduit 6.
A lid 8 with a clamp 82 is attached to the open end of the conduit 6.
It is removably attached by @. The lid 8 is split in half at the part where the tow rope 4 is led out. The tip of the tow rope 4 is wound around the drum 9a of the winch 9, and by winding the tow rope 4, the bigs 2 and 3 are inserted into the existing pipe 1 via the insertion conduit 5. During this insertion, the front pig 2 is inserted first,
The resin C enters the front side, and then the rear pig 3 is inserted into the conduit 5, and the resin is filled with the gap between the front pig 2 and the rear pig 3 corresponding to the resin filling tank part 5a. tank 7
It is filled with a pressure of 7C. At this time, the opening/closing lock 53 is opened in order to exhaust the air in the gap, and the air is led out by the exhaust part 5b. A cross pin 54 is removably attached to the outer end of the conduit 5 in order to prevent the rear side big 3 from being pulled out from the artificial end of the conduit 5 due to the filling pressure of the resin. The towing cable 4 is pulled by the winch 9 in a state in which the resin resin fills the gap between the bigs 2 and 3 sufficiently. In addition, with the completion of resin filling JR, cock 52
is closed. Bigs 2 and 3 are being pulled by the tow rope 4, but
The resin C in front of the BIG 2 removes the dust in the existing pipe 1 and the dust in the space of the pipe joint part 13 by adhering it with its own adhesiveness. In this way, when the bigs 2 and 3 are pulled by the tow rope 4, for the big 3, the quick response point between the big 3 and the tow rope 4 is the place of the embedded disc 39, so that the embedded disc 39 A compressive action occurs between the support disk 36 at the tip and the support disk 36 at the tip, and the closeness to the inner wall of the existing pipe 1 is improved. On the other hand, due to traction, an elongation action occurs in the body between the embedded disc 39 and the support disc 37 at the rear end, but due to the action of the wire J8 and the bolt/narrow i~, no elongation occurs substantially. Therefore, contact with the inner wall of the existing pipe 1 can be maintained virtually without any problem. [Operation of the invention] When the rear side pig 3 reaches the position of the pipe joint part 13 by pulling the rear side pig 3 (see Fig. 9), the resin resin on the front side of the rear side pig 3 is removed during the towing movement. Sufficient filling pressure is generated at the rear end of the resin due to the viscous resistance between it and the inner wall of the existing pipe 1, and this filling pressure causes the resin to flow into the joint space of the pipe joint 13 via the groove 17. Ru. On the other hand, from the joint space of the pipe joint part 13, air is subjected to filling pressure and flows into the groove 18.
naturally pushed backwards through. At this time, a negative pressure may be applied to the rear space of the rear pig 3 to suck and discharge air from the pipe joint 13 via the groove 18. In this case, the filling pressure applied to the resin acts on the groove 17, and the expansion force of the big 3 in the circumferential direction acts on the groove 17, which causes the big 3 to bend and affects the groove 18. but,
There is a shape-retaining member 43 here, and both sides of it @ 43b are
Resisting force is exerted to maintain the opening width of the groove 18 against the force applied to the groove 18. Therefore, the opening of the groove 18 is not narrowed, and the replacement of the resin with air can be achieved smoothly and reliably. In the above embodiment, the shape-retaining member 43 was constructed as an integral piece that was long in the longitudinal direction of the groove 18, but a short shape-retaining piece with a diagonal tunnel cross section was used in the longitudinal direction of the groove 18. They may be installed side by side. In this case, since the shape-retaining pieces are independent, the flexibility of bending in the longitudinal direction of the big is achieved by the structure itself, and the notch 43a @

[There's no need to cry. 【Effect of the invention】

As described in detail above, in the resin filling groove and the replacement groove that are arranged alternately on the outer periphery of the resin conveying big, filling pressure is applied to the resin filling groove to cause the groove to expand. Even if this happens, this effect will not affect the replacement groove by providing the shape-retaining member, and the width of the opening to the replacement groove 11 can be maintained at a specified level, so that the air and resin replacement effect is ensured at the pipe joint. The effect is that the pipe joint rod can be repaired accurately.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a metal body of a construction device showing an embodiment of the present invention, Fig. 2 is a schematic side view showing a portion of a replacement pig insertion conduit, and Fig. 3 is a schematic side view showing a portion of a VIG lead-out conduit. A schematic side view, FIG. 4 is a vertical sectional side view showing the towed state of the VIG, FIG. 5 is a half-section side view of the front VIG, FIG. 6 is a perspective view of the replacement rear VIG, and FIG. 7 is a side view of the same half. Sectional side view, Figure 8 is the same front view, Figure 9 is the same front view.
The figure is an enlarged cross-sectional view of the main parts showing the state of resin filling. 1...Existing pipe, 11.12...minute 1lII@, 13
...Pipe joint part, 13a...Large diameter part, 13b...
Pipe end, 14...Sealing material, 15...Lead material, 17.1
8...Groove, 17a, 18a...Tapered end wall,
19... Passage, 2... Big, 21... Body piece, 22... Fin piece,
23... Head piece, 24. 25... Support disk, 26.
...Stud bolt, 27...hole, 28.29...
Color, 28a, 29a... Bolt, 28b,
291)... Receiving seat, 3... Big, 31... Head piece, 32... Body tip piece, 33... Body piece, 34... Rear body piece, 35・
...Fin piece, 36.37...Support disk, 38...Wire, 38a, 381)...Bolt, 38c,
38d... Oak 1-139... Embedded disk, 3
9a... Oak [..., 4... Traction rope, 4()... Supply pipe, 41... Container, 43... Shape retaining member, 43a... Notch, 43b...
...Side wall, 5...Vig insertion conduit, 5a...Resin filling port, 51]...Exhaust port, 51...Clamp,
52.53... Cock, 54... Cross pin, 6... Vig outlet conduit, 6a... Discharge port, 61
)...Air pressure supply pipe, 61...Opening/closing cock, 7...Resin filling tank, 7a...Hose, 7b...
- Generator, 7C... Compressor, 8... Lid, 81... Guide reel, 82... Clamp, 9... Winch, 9a... Drum, 10...
・Compressor, 10a...pressure operation unit 1~, △
, B... pit, C, D... resin. Patent applicant: Tokyo Gas Co., Ltd. Agent: Hakko Co., Ltd. Patent attorney: Makoto Kobashi Ukiyuki Patent attorney: Susumu Murai

Claims (1)

[Claims] This is a VIG that airtightly slides inside the existing pipe and moves the resin placed on the front side along the inside of the pipe.It has a resin filling groove and a replacement groove on the outer periphery, and during the movement process, the resin is transferred to the pipe joint. In the device in which the resin is replaced and filled between the resin filling groove and the replacement groove so as to penetrate into the gap, the resin filling groove and the replacement groove are out of phase with each other in the circumferential direction. The replacement grooves are provided alternately in parallel, and the replacement grooves are equipped with a shape-retaining member that prevents the grooves from deforming, so that the grooves are formed so that they do not deform when the VIG is bent. Resin conveyor big for repairing the flat part of existing pipe joints.