JPS60139359A - Resin conveying pig for repairing pipe joint part of existing pipe - Google Patents

Abstract

PURPOSE:To smooth the inflow of a resin and to perform perfect sealing, by providing a resin filling groove and a resin replacing groove so as to shift a phase in the circumferential direction of a pig peripheral surface and making the replacing groove longer than the supply one. CONSTITUTION:Resin introducing grooves 17 are formed to a rear side pig 3 so as to be positioned at left and right parts of the outer periphery of the pig 3 while a resin replacing grooves 18 are formed to the upper and lower parts of the outer periphery of the pig 3 so as to shift the positions thereof. The grooves 18 are longer than the resin introducing grooves 17 in a longitudinal direction to open the replacing grooves 18. By this mechanism, the filling of a resin can be directly performed while the pulling-off of the resin is well and, therefore, perfect sealing property can be secured.

Description

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

The present invention mainly involves moving resin along the inside of the pipe when repairing the pipe joint part of an existing pipe that is J1 underground.
The present invention also relates to a resin conveyor for repairing a pipe joint, which functions to fill the gap in a permanent joint.

[Prior art]

In existing pipes such as gas 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 leaks, so recently the purpose of leak repair or preventive maintenance has been Therefore, it is being considered to repair the pipe fittings of existing pipes from the inside of the pipe while leaving them buried. As a type of repair method, the existing underground pipe is divided into repair units of a predetermined length, and the pipe is inserted into the existing pipe in the repair section from the force separation section 1] in airtight contact with the inner surface. A sliding pig is inserted with resin placed on the front side of the pig, and while applying pressure to the resin on the front side of the pig in the direction of travel, the pig is pulled by a towing cable to move the inside of the pipe to the other separation opening. A pipe fitting repair method has been proposed in which the gap between a plurality of pipe fittings interposed in an existing pipe is sequentially filled with resin in the process of moving in the opposite direction. In addition, in the above repair method, regarding the pig that moves the resin along the inside of the pipe, a resin filling groove and a replacement groove are provided on the circumferential surface of the pig, and the resin placed on the front side of the pig is passed through both grooves. , a method was proposed in which the gap in the pipe joint part was carved and filled. In this product, a groove for resin filling and a groove for replacement are formed on the outer circumference of the pig at an intersection U with a phase change in the circumferential direction, and the resin conveying pig passes the position of the pipe joint part during the movement process. When filling the pipe, the resin is guided to the -C pipe joint through the resin filling groove, and on the other hand,
Due to the introduction pressure of the resin, substitute substances such as air are drawn out from the gap in the pipe joint 1 through the displacement groove.In this way, it is possible to determine whether a leakage phenomenon is occurring at the pipe joint. Regardless, the resin is ensured to penetrate and fill the sealing material through the gap in the pipe joint, thereby ensuring the sealing performance of the U-T.

[Technical problem of the invention]

However, the problem here is that in order to compensate the resin filling pressure for the gap between the pipe fittings, when the pig passes through the pipe joint, at one point the resin on the front side of the pig is Pressurized air is supplied into the existing pipe so that air pressure is applied from the front side. Therefore, even if the groove for resin filling faces the gap in the pipe joint part on the outer circumference of the pig, it will not fit inside the existing pipe. The introduced pressure)j air obstructs the flow of the resin, and the resin does not flow smoothly into the gap until the replacement pressure)b faces the gap in the joint part. Also, at the stage where the replacement groove finishes passing through the gap in the pipe joint, air removal becomes difficult, so the flow of the resin is suppressed, and the resin does not completely wrap around the gap at the bottom of the pipe joint. However, the sealing effect may not be achieved reliably.

[Purpose of the invention]

The present invention has been proposed in order to solve the above-mentioned disadvantages, and when the resin filling groove faces the pipe joint lower gap, the pressurized air introduced into the existing pipe is released and the resin filling is started immediately. After starting, until the resin filling groove finishes passing through the gap at the bottom of the pipe joint, the resin should flow smoothly, and the resin should be handled with a comb using a comb to prevent insufficient filling of the resin.
It is an object of the present invention to provide a resin conveying pig for repairing a pipe joint part that can maintain perfect sealing performance for 41f.

Arrangement 1 of the Invention For this purpose, the pig according to the present invention is arranged so that the resin filling groove and the replacement groove are alternately arranged with a phase difference l- in the circumferential direction of the pig circumferential surface. It is characterized in that the replacement groove is opened longer in the front and back than the resin filling groove in the longitudinal direction. [Actual Travel 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 the sub-Fig. This is a long piping system in which spinnerets of a predetermined size are connected by a water pipe joint 13. When repairing the pipe joint 13 of the existing pipe 1, the existing pipe 1 is first divided into repair sections of length suitable for repair (for example, 100 m), and one separated end 11 is placed above ground. The other separated end 12 is exposed in the vertical hole 8 which is also opened in the field soil, and these separated ends 11
, 12, a pig insertion conduit 5. to be described later. Connect the pig lead-out conduit 6. And one guide for inserting the pig @! Pass the tow rope 4 through the existing pipe 1 from step i (7) and pull it out from the other pig lead-out conduit 6, and attach the tip of this tow rope 4 to the winch 9.
A pair of front and rear pigs 2 and 3 are attached to the tow rope 4, and a low viscosity melon resin C is applied to the front of the front pig 2 and to the 9"r of the rear pig 3. are introduced into the existing pipe 1 with resin seals for the joints F, respectively, and are pulled and moved by pulling the input side toward the input side and the L side. As shown in the enlarged cross-sectional view in FIG. 21 and a plurality of fin pieces 22 made of a hard elastic material (for example, R131! neoprene rubber with a degree of about 60 degrees) are joined together alternately, and on the front side in the direction of movement are made of the same material as the hard elastic material. Conical head 11
23, and metal support disks 24.
2! + is arranged, and the stud bolt 2G is passed through between these front and rear support disks 24 and 25, and the body piece 2 is tightened by tightening 26 to the stud pole 1.
1. The fin piece 221 and the head piece 23 are integrally connected in tandem, and each piece is constructed in a 'J' structure so that it does not extend in the longitudinal direction. And in the medium fire, a 3ff+"J hole 27 is drilled for the tow line 4, and the front pig 2 and the tow line 4 are attached to the front pig 2 and the crane buoy 1 collar 28.2
It is connected by 'C' by 9. The above clamps (J collars 28 and 29 have bolts 211a and 29;
．． The towing cable 4) and 2 are fixed at the fastening number between the receiving seat 28h, 20L and the 29, and this crane buoy 1 collar 28, 29 is connected to the hole 27.
It is installed at both ends of the flexible vibrator inserted inside,
stomach. The above-mentioned pipe has the function of passing the tow rope 4, and
Although it also functions as a passage for supplying compressed air from the front to the rear, this supply passage for pressurized air may be provided separately. In addition, the rear pig 3 is made of a hard bullet 1Jl material (for example, hardness A truncated conical head J made of neoprene rubber (about 60 rubber, etc.)
131, followed by a soft elastic material (for example (
f! Hard neoprene sponge with a degree of about 50 degrees)
Connect the truncated truncated circle 31 (shaped body tip piece 32) and the following cylindrical body part 3, and attach the forward bending soft bullet f1 ( A body piece 34;
It has a structure in which the hard elastic material and fin pieces 35 made of the same material are alternately connected in tandem, and the entire body is held between support disks 36 and 37 provided at the front and rear ends. The support disks 3 (i, 37 are installed at both ends of the wire puller 738 (J)
Nut 3 to bolt part 38a A3 and 381)
8c and 39d are tightened to crimp and support the above eight pieces together. In this case, an embedded disk 39 fixed to the tow rope 4 is provided on the leading end side of the cylindrical body piece 33 in the direction of movement.
is provided, and this inset disk 39 has a nut 39a.
The bolt part 388 is screwed into the bolt part 38a, and the pole is partially screwed into the bolt part 38a.
The distance between the front support disc 36 and the embedded disc 39 is regulated through the head J', 31. This prevents the trunk end 32 from being unnecessarily compressed and deformed. In addition, since the rear pig 3 is tensioned in the middle by a wire A738, its main body is a ladle-shaped body piece 3, which restricts its elongation while moving inside the pipe. In addition, even if the overall length is relatively long compared to the diameter, the flexibility of the body is maintained (1') [the passing resistance at the curved pipe section is considered to be small. Also, after -1. In the side big 3, grooves 17 for introducing resin are formed on the left and right sides of the vertical circumference, and these are arranged in parallel and cover each other. Therefore, in the case of the present invention, the resin introduction grooves 17 and the replacement grooves 18 formed on the outer periphery of the pig 3 are IKed before and after the resin introduction grooves 11 with respect to the length fh direction.
<It has a 41η configuration with the replacement groove 18 opened. The rear ends of these grooves 17, 18 are tapered end walls 17a that slope diagonally rearward from the groove bottom toward the outer periphery.
18a. Furthermore, the above-mentioned grooves 11 are connected to a passage 19a made of, for example, a polyethylene dupe, which is buried in the pig so as to be pulled out to the front end of the replacement pig 3, and the grooves 18 are The rear end of the displacement pig 3 is connected to a passage 19b made of a polyethylene duplex or the like immediately installed inside the pig. The pigs 2 and 3 having such a configuration are as follows: 7. :J, low viscosity resin C inserted into existing pipe 1 in sea urchin repair section [-
1. The resin seal for the joint part is moved along the inside of the pipe, and during this moving process, a small number of casing joint parts 13 interposed within the section are repaired. Figure and 9th
As shown in the figure, for example, the outer tube end 131) of one tube is brought into contact with the diameter section 13a provided at the tube end of one tube, and this abutment is usually caused by a "stone" in the fitting part. A seal 14 called "Hada" was requested, and a seal 14 of 4vI construction made by sealing one part with lead material 15 was ordered, and the existing pipe 1 to be repaired was [As shown in FIG.
．． 6 is shown enlarged in FIGS. 2 and 3. Is the VIG insertion conduit 5 already installed as shown in Figure 2? , 11
One end 11 is freely connected to the other end 11 with a clamp 51, and the pig insertion conduit 5 is provided with a resin filling opening 5a. An opening/closing cock 52 is provided there.Also, an exhaust part 5b is provided at a slightly higher level than that, and an opening/closing cock 5°3 is stepped there. , into the resin filling opening 5a through the opening 52,
The resin filling tank 7 is connected to the hose 7a (i L , and the filling pressure to the L tank 7 is 3.
1. Small size 21 pumps! Given by Tree 7C. Further, as shown in Fig. 3, the above-mentioned Big outlet conduit 6 is provided with an Ill outlet hole 6a for discharging the residual resin one by one, and an opening/closing hook G1 is provided here. I'm excited. Further, above the JJI output part 61, the conduit O is provided with an air pressure supply port pipe 6b. Also, a guide reel 8 for leading out the tow rope 4 passing through the conduit G is provided.
A lid 8 with a clamp 8 at the CI end between said conduits 6
The lid 8 is split in half at the lead-out portion of the tow rope 4. The tip of the tow rope 4 is attached to the door of the winch 9. Tsum 9a
By winding the tow rope 4, the pigs 2, 3
is inserted into the existing pipe 1 via the insertion conduit 5. During this insertion, the front pig 2 is first inserted, the resin C is poured into the front side, and then the rear pig 3 is inserted into the S pipe. The space between the front pig 2 and the rear pig 3 is inserted into the tube 5.
For resin filling [Resin resin is supplied from the tank 7 in a state corresponding to the first part 58] under the pressure of the compressor 7G. At this time,
In order to discharge the air within the gap, the opening/closing lens 53 is opened and the air is led out through the discharge port 5b. Due to the filling pressure of the resin, the rear pig 3 connects the 5 conduits [: 1 end with no stress (
] To prevent it from coming out, a spin 54 is removably attached to the outer end of the foundation tube 5. With the gap between the pigs 2.3 sufficiently filled with resin, the tow line 4 is pulled with a 1 inch 9 drive. Furthermore, upon completion of resin filling, the =1 lock 52 is closed. By pulling the tow line 4, the pigs 2 and 3 are pulled (but
The resin C in front of the pig 2 removes dust inside the existing pipe 1 and dust in the space of the pipe joint 13 with its own adhesive property.
It has the effect of attaching and removing. When the pig 2.3 is pulled by the tow rope 4, the connection point between the pig 3 and the tow rope 4 is j(1
Therefore, LL rice action occurs between the embedded disk 39 and the support disk 3G at the tip, and the closeness to the inner wall of the existing pipe 1 is reduced. on the other hand,
By traction, the support disk 31 at the rear end of the embedded disk 39
An elongation action occurs in the trunk between the two, but due to the action of the Yhe 238 and the bolt Nara], the H medium length does not substantially occur, so any contact f1 with the inner wall of the existing @1 will actually be a hindrance. It will be maintained that there is no such thing. Effect of the invention: By pulling the pigs 2 and 3, the rear side (the pig 3
When the resin resin on the front side of the rear pig 3 reaches the position shown in FIG. occurs, and this filling pressure causes the resin to flow into the joining space of the pipe joint portion 13 via the groove 17. On the other hand, from the joint space of the pipe joint part 13, air receives filling pressure and flows into the groove 1.
It is naturally pushed backwards through B. At this time, by applying negative pressure to the rear space of the rear pig 3, the groove 18 is
Air may be sucked and discharged from the pipe joint part 13 via the pipe joint part 13. In this case, when the resin resin on the front side of the rear pig 3 that performs the replacement action is pushed forward until the gap in the pipe joint 13 is 4 +J and goes -C, the existing pipe 1 on the front side of the resin 1]
When the pig 3 reaches the position of the pipe joint 13, the replacement groove 18 is first inserted into the gap on the outer periphery of the pig 3. , the air in the gap can be discharged to the rear of the pig 3 through the passage 19b.If pressurized air is introduced in front of (BJ resin 1) to compensate for the resin filling pressure, If supplied, the pressure is lowered to at least the rear pressure of the pig 3 (atmospheric pressure or negative pressure), and the gap is ready to receive resin filling. When the gap between the products is filled, the resin immediately enters the gap and is filled in the circumferential direction, and while the pig 3 is moving, the resin is replaced with air between the grooves 18. The gap is filled with resin. Even in step C when the resin filling groove 17 finishes passing through the pipe fitting gap, the replacement groove 18 still corresponds to the gap, so excess resin is removed from the gap. 11tj
is pulled out to the groove strip 18, and the resin filling of the pipe fitting 13 is completely completed until the iM strip 17 for resin filling has finished corresponding to the gap, and the sealing bamboo is completed. When the repair to the J3 pipe joint 13 is completed, remove the clamp 82, remove the lid 8, and divide it into 2 pieces.
Inquire about the point 1 in j, first d, derive the resin C on the front side of the front side pig 2, and then derive the rear side pig 3. Soshi-
C, loosen port t-28a, 281) and collar 28
If you release the lock, release the continuous tightening of Pig 2 and tow line 4, set Pig 2 free, and then pull the tow line 4 with winch 9, Pig 2 will not move and only Pig 3 will be connected to the conduit. It climbs up inside 6. At this time, the remaining resin is discharged 4' into the container 41, for example, through the I outlet pipe 6a. in this case,
The lid 8 is divided into two parts as shown in the figure.
Tow rope 4 is wrapped around Wooinboo - (even if there are pigs 2 and 3)
I don't want it to get in the way of taking it out. [Effects of the Invention] The present invention is as follows: When the feeding pipe advances, the replacement groove first faces the gap in the pipe joint part, and then the resin filling groove corresponds to the gap in the joint f, so it is necessary to insert the groove into the existing bamboo on the front side in the direction of resin travel. Even if one air is supplied, the additional air is removed from the gap to the rear of the pig via the displacement groove, and the resin filling immediately stops, and the resin fills the gap. After the replacement groove has passed, the replacement groove corresponds to the above gap, and the gap is made better by filling the gap with the replacement groove.
The effect is that there is no insufficient filling of the resin, and complete 'J sealing performance can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the entire 71 construction neck showing one embodiment of the present invention, Fig. 2 is a schematic side view showing a portion of the replacement pig insertion conduit, and Fig. 3 is a schematic side view showing the pig extraction conduit portion. '1J Schematic side view, Fig. 4 151. 1J vertical side view showing the towed state of the pig, Figure 5) is a half-section side view of the front pig, Figure 6 is the perspective opening of the replacement 1-side pig, and Figure 7 is the 'l' mi side of the same. FIG. 8 is a side view, FIG. 8 is a front view of the same, and FIG. 9 is an enlarged sectional view of the main part showing the state of resin filling. 1... Existing Gai, 11.12... Separation end, 13...
Pipe joint part, 13a... Large diameter part, 1311... Pipe end, 14... Seal material, 15... Lead phase, 17.18
...Groove, 17a, 18a...Tapered end wall,
19a, +91fu... passage, 2... pig, 21... body piece, 22... fin piece,
23...Head piece, 24.2! i...Support disk, 26
... stud pol]~, 27... hole, 28.29.
...Color, 28a, 29a...Bolt, 28b
, 291) ... To the circumference of the receiving number 3 ... Bin', 31 ... Head J-i, 32 ... Trunk tip piece, 3
3... Torso r1.34... Rear chest piece, 35...
Fin piece, 30.37...Support disc, 38-Fin puller7.
38a, 3811-...Pol+-138G, 3
8d... Pui~, 39... Embedded disk, 39a
... Oak 1~. 4... Tow rope, 40... Supply pipe, 41... Container,
5...29 pipes for pig insertion, 5a...resin filling port, 5
b...111 Kigawamebe, 51...Clamp, 52.
53...] Trilife 54...Cross bin, 6...Sf for pig derivation! ', 6a...discharge port,
6b...Air pressure supply property, 61...Opening/closing-1 ivy, 7
... Resin filling tank, 7a... Hose, 7b...
Kodeniso, 7C... Complete tree, 8... Lid, 81... Guide reel, 82... Clamp, 9... 1 inch, 9a... Drum, 10...
...] Compressor 10a...pressure operation gornit,
Δ, B... Vertical hole, C11]... Resin. Patent attorney Makoto Kobashi Patent attorney Susumu Murai

Claims (1)

[Claims] This is a pipe fitting that slides airtight inside the existing pipe and moves the resin placed on the front side while staying inside the pipe.It has a resin filling groove and a replacement groove on the outer periphery, making it possible to transfer the resin during the movement process. In b, the resin is replaced and filled between the resin filling groove and the replacement groove so that the resin permeates into the gap between the parts, and the resin filling groove and the replacement groove are arranged so that the resin fills in the circumference of the pig's circumferential surface. The replacement grooves are arranged alternately in parallel with a phase shift in the direction (), and in the longitudinal direction, the replacement grooves are placed 1"Itf after the resin filling grooves.
A resin lll1I feeding pig for repairing the flat part of an existing pipe joint, which is characterized by the fact that: