JPS6115771A - Resin feeding pig for repairing pipe joint part of existing piping - Google Patents

Abstract

PURPOSE:To perform perfect repairing work while reducing traction resistance, by providing an embedding plate between a leading end barrel piece and a barrel piece and securing the same to a traction cable. CONSTITUTION:An embedding plate 39 is provided between a leading end barrel piece 32 and a barrel piece 33 and secured to a traction cable 4 while the support 36 provided to the front end of a pig 3 and the embedding plate 39 are connected so as to clamp the leading barrel piece 32 therebetween by bolts and nuts 38a-d and the embedding plate 39 is connected to the support plate 37 provided to the rear end of the pig 3 by a wire 38 so as to suppress the stretching of the barrel piece 33. By this method, because air-tightness is held in the front side and not only stretching is suppressed but also air-tightness is held in the rear side, repairing work is perfectly realized.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention mainly involves moving resin along the inside of the pipe when repairing the pipe joint of existing pipes that are immediately installed underground.
The present invention also relates to a resin conveying pig for permanent joint repair, which has the function of filling the gap in a pipe joint. [Prior Art] Long cast iron pipes are connected to pipes underground (under roads) using water-type pipe joints.In existing pipes such as gas pipes, the joints of the pipe joints are Recently, the joint state has changed due to the load of vehicles, earthquakes, or age, creating gaps in the joint, and the constituent materials of the joint have deteriorated, causing leaks. For the purpose of leakage repair or preventive maintenance, it is considered to repair and cover the pipe joints of existing pipes from the inside of the pipes while they are buried.As a type of this repair method, existing 8Q pipes installed underground are repaired to a specified length. Divide it into the middle part of the repair, and do one part.
A pig that slides in airtight contact with the inner surface of the pipe is inserted from the open area into the existing piping in the repair section with resin placed on the front side of the pig, and pressure is applied to the resin from the front side in the direction of travel of the pig. The pig is towed by a tow line while adding

[In the process of moving in the direction of the other branch opening 11, resin is sequentially filled into the gaps between the plurality of wax joints interposed in the existing piping. 1r repair methods have been proposed. In addition, in the 10-ki repair force method, regarding the pig that moves the resin along the inside of the pipe, a groove for resin filling and a groove for replacement are set on the circumferential surface of the pig in 1 and 2. It was proposed that the resin placed on the front side of the pig be replaced with W into the gap of the pipe joint and filled with IJ. [Technical Problem 1 of the Invention] Here, the problem is 1.1. The replacement groove formed on the outer periphery of the pig faces the pipe joint part during resin filling. Therefore, considering the traction of the tow rope 3!1σ,
The pig itself is formed into a circle (■ shape) with a corresponding length. 1) This pig is II! K! Since it is difficult to pass through the bent part of the pipe, a relatively flexible cable is used, and the tow cable is used to pass through the center of the pipe. The pig is usually hardened at the 71et end or (() end. However, when the pig is pulled by the tow line, it experiences frictional resistance between the inner shell of the l! Therefore, if the front end is fixed, the entire pig will be stretched and the diameter will become smaller, which will impair airtightness.If the rear end is fixed, the front side will be compressed due to frictional resistance during towing, causing the diameter to increase. Therefore, if both the front and rear ends are tightly covered with tow cables, the front outer circumference will be pulled rearward due to frictional resistance and the diameter will become smaller, while the rear side will be compressed. The diameter of the pig becomes large, which is not good.In addition, because the pig moves forward with resin placed on the front side, the resin gets into the small diameter part on the front side, causing the pig to be replaced. Therefore, a connection point with the tow rope is provided in the middle of the pig, and a slight compressive force is applied on the front side to maintain airtightness.
The rear side has a configuration that suppresses rear expansion, making it virtually airtight.
It is desirable to have a pig structure that maintains lt and allows the pig to be towed with little sliding resistance. Purpose of the Invention 1 The present invention is designed to maintain airtightness by applying a compressive force to the front part of the pig during the movement of resin by pulling the pig;
Moreover, in the rear part, the airtightness is maintained by suppressing the airtightness.
The purpose is to provide a pig structure that can be used in conditions with suitable dynamic resistance. DESCRIPTION OF THE INVENTION For this purpose, the present invention provides a pig (1), which is divided into multiple parts (such as a tip body piece, a body part 11),
The kone is made of flexible rubber material, and there is an embedded plate between the tip body piece and the body piece, and this embedded root is fixed to the cleaning rope, and the front end of the pig lζ
The support plate and the embedded plate are connected with bolts and nuts so as to tighten the tip body piece, and the support plate and the support plate are connected to each other so that the tip body piece is tightened. It is characterized in that the body pieces are connected to each other by a wire 17 passing through the inside so as to suppress elongation. (Example) An example of the present invention will be described below with reference to the drawings. Fig. 1 is a diagram schematically showing the entire repair construction equipment, and in Fig. 1, the reference numeral 1 indicates an existing underground pipe to be repaired; This is a long piping system in which cast iron pipes using a predetermined Nl method are connected using a conventional color scheme using a water pipe joint 13.In repairing the pipe joint 13 of the existing pipe 1, For the construction, the existing piping 1 must first be cut to a length suitable for repair (for example, 100 m).
) and divide it into medium-sized repair sections.
Into the pit A with the frontage of A1 on the ground,
are respectively exposed in the vertical hole B which is also opened above the ground, and a pig insertion conduit 5. to be described later is connected to these divided ends 11 and 12. Connect the pig lead-out conduit 6. Then, the tow rope 4 is passed through the existing pipe 1 from one of the pig insertion conduits 5 and pulled out from the other pig lead-out conduit 6. A pair of front and rear pigs 2 attached to cable 4
．． 3 is introduced into the existing pipe 1 with a low-viscosity resin C placed in front of the front pig 2 and a joint sealing resin placed in front of the rear pig 3, and the inside of the pipe is installed as an inlet. side to exit side (, - direction 4t T traction, J being moved, sea urchin 1
/ is there. The front pig 2 is made of a plurality of shells with 6 flexures (e.g. hardness of about 50 mm, hardness 71 mm, Δprene spongy T, etc.) shown in an enlarged sectional view in Fig. 5. The piece 21 and a plurality of fin pieces 22 made of a hard elastic material (for example, non-rubber with a hardness of about 60 degrees) are joined alternately, and the direction of movement of the fin is 6r on the 1 side.
■ Distributing hard bullets +11 ((A 4-inch truncated conical head piece 23 is installed from a homogeneous shrine hole, and a metal support disk 24, 25 is placed after oIt at -) μ, the stud pole [・2G
Ir1s 3i will be held throughout January! For the case of i, tighten the stud bolt 26 (by tightening the body piece 21, fin piece 29 and head piece 23 in tandem so that the main piece does not stretch in the longitudinal direction). The hole 27 is shaped like a V-shaped groove through which the tow rope 4 passes, and the front pig 2 and the tow rope 4 are connected to the clamps installed at the front and rear of the front pig 2. At 28.29, 1 means 31! It's getting old.
8.29 No. 128h, 291) Tightening between 4-J"C It is a structure that is fixed to the tow rope 4,
The collars 28 and 20 with clamps are preferably installed at both ends of a flexible pipe inserted into the hole 27.The pipe has the function of passing the tow rope 4, and also has the function of passing pressure from the front to the rear. It also functions as an air supply passage.
This pressure air supply passage may be provided separately. In addition, the rear pig 3 according to the present invention has a hard bullet (for example, hardness A truncated cone-shaped head piece 31 made of a 60° hardness (e.g., 60° hardness), followed by a continuous soft bullet + J etc.), and a truncated cone-shaped body tip piece 32 consisting of a circle (
1-shaped body piece 33, and a rear body piece 34 made of the same material as the soft elastic material, and the hard bullet P.
[It has a structure in which the shrine and fin pieces 35 made of the same material are alternately connected in tandem, and support disks 36 provided at the front and rear ends.
The entire body is held between 37. The above-mentioned supporting disc 36.
37 is provided at both ends of the wire 38 (J bolt part 38a
Nut 38c, 39(l) for A3 and 381)
The ten pieces are crimped and supported together by tightening them. The rear support disk 37 is also secured to the towline 4 by suitable means, such as clamping means. Further, in the case of the present invention, the rear pig 3 has a body piece 33 having a length that accounts for at least most of the total length of the pig 3, and has a core part p3a made of relatively hard rubber in the center, The core member 3a is provided with a material 1313t+ such as the above-mentioned hard neorene sponge on its outer periphery, and the core member 3a has a moderate followability against bending, but has sufficient resistance against elongation. Something is chosen. Further, on the leading end side in the traveling direction of the body piece 33 in the shape of a rotor 1, there is provided an embedded disc 39 (J) fixed to the tow cable 4, and this embedded disc 39 is secured to the tow cable 4 by a nut 39a. The bolt part 38a is screwed into the bolt part 38a, and the distance between the front support disk 36 and the embedded disk 39 is regulated through the bolt part 38a, so that the head piece 31 and the tip of the body part 32 are compressed and deformed more than necessary. It prevents being Since the middle part of the rear pig 3 is stretched by a wire 38, its main body is a cylindrical chest piece 33.
While moving inside the pipe, the elongation of the tube is regulated, and even if the overall length is formed relative to the diameter, the flexibility of the body is ensured. In addition, since the rear pig 3 needs to have a resin replacement function, a resin introducing groove 17 having a communication opening J' toward the front side in the traveling direction is provided on the outer circumference of the rear pig 3. It is formed on the left and right outer periphery of the pig, and the body piece 33 is parallel to this.
In this case, replacement grooves 18 are formed on the upper and lower outer peripheries of the pig. - These grooves 17, 18 are formed in tapered end walls 17a, 18a whose respective rear end walls in the traveling direction are obliquely inclined toward the rear, and the above-mentioned replacement grooves The strip 18 communicates with a channel 19, such as a polyethylene tube, which is buried in the pig so as to open over the rear end of the rear pig 3. The pigs 2 and 3 having such a configuration are inserted into the existing pipe 1 in the repair section 1- as described above, and the low viscosity resin C9 joint sealing resin is moved along the inside of the pipe. This is to repair a plurality of pipe joints 13 that are interposed and covered within the section during the movement process, and as shown in Figs. 4 and 9 for each pipe joint 131J, for example, The other cylindrical end 13I) abuts against the large diameter portion 13a
'Years old, rain match 1! Normally at the +br joint [hemp In, 1
A sealing material 14 called fi4N is filled in and seals the opening.
It is from Sujin, sealed with a J15 bottle. As described above, the existing piping 1 to be repaired has the pig offshore inlet pipe 5 connected to one separated end 11 and the pig outlet pipe 6 connected to the other separated end 12 at 'f: 41. However, these conduits 5 and 61J are not shown enlarged in FIGS. 2 and 3. The lary material for pig insertion, 'i IJ, is shown in FIG. One side of the already installed Ω pipe 1 is separated *11110 with a clamp 51 attached to the frontage. There is an opening/closing cock 52 located at 1tll!lJ. Also, an exhaust port 51) is provided at a high level position. An opening/closing lock 53 is provided here.A resin filling tank 7 is communicated with the resin filling opening 5a via a bow 7a through the opening/closing lock 52.
The filling pressure is applied from the small compressor 7G by driving the generator 7b. Also, Jiiii! As shown in FIG. 3, the ## tube 6 for extracting the PIC is provided with a discharge port 6a for discharging the residual resin, and a (J opening/closing section 1) is installed therein. Above the outlet portion 61, the guide cage 6 is provided with an air pressure supply [)τ161]. Also, a guide reel 8 guides the tow rope 4 passing through the conduit 6.
1 is equipped with λkM8, and the clamp 8 is attached to the open end of 6 to the
It is installed so that MIIR is possible. -1- M8 has a configuration in which the extension portion of the tow rope 4 is divided by 1'. 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 pigs 2 and 3 are inserted into the existing piping 1 through the insertion conduit 5. During this insertion, the front side pig 2 is inserted first, the resin C enters the front side thereof, and then the rear side pig 3 is inserted into the conduit 5, and the gap between the front side pig 2 and the rear side pig 3 is filled. but,
One resin is filled with the pressure of the tank 7J and the recombiner 7C in a state corresponding to the resin filling opening 5a. At this time, the air in the gap is ill +++ ′? To do this, the opening/closing cock 53 is opened and air is drawn out through the discharge port 51). In order to prevent the rear pig 3 from coming out of the t & i J from the 5th end of the force tube by filling the resin IKt R, the 1 spin 54 is removably attached to the outer end of the 1- mark guide pipe 5. . When the gap between the pigs 2 and 3 is sufficiently filled with the resin 1], the tow rope 4 cannot be pulled by the driving force of the winch 9. Further, upon completion of resin filling, the rack 2 is closed. Pigs 2 and 3 are pulled by the tow rope 4, but
Pig 2's 11f1 resin C removes dust in the existing piping 1 and in the space of the pipe joint 13 with its own adhesive, and also improves lubricity. A is the effect of

Effects of the Invention In this way, when the τ pigs 2 and 3 are pulled by the tow rope 4 in 1st knot, C for the rear pig 3 is the embedded circle where the pig 3 and the tow rope 4 are connected. Therefore, a compressive action occurs between the embedded disc 39 indicated by - and the support disc 36 at the tip, improving the close contact with the inner cavity of the existing pipe 1. On the other hand, due to traction, an elongation action occurs in the body between the embedded disk 39 and the support disk 37 at the rear end, but due to the action of the wire 38 and the bolts and nuts, no elongation occurs substantially. The contact with the inner wall of the existing arrangement 1 is substantial.
1. It will be maintained without any problems. When the rear pig 3 reaches the position of the pipe joint part 13 by towing the pigs 2 and 3 (see Fig. 9), the 1+56 resin is attached to the front side of the rear pig 3.
Sufficient filling pressure is generated at the rear end of the resin due to the viscous resistance between the resin and the inner wall of the pipe, 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, air is naturally pushed out rearward from the joint space of the pipe joint part 13 via the groove 18 under the filling pressure. At this time, it is preferable to apply negative pressure to the rear space of the rear pig 3 and to suck and discharge air from the stub joint 13 through the groove 18. Is this quality of the joint part? During the repair process, the rear pig 3 encountered strong resistance for some reason when passing through the existing piping 1 (-
), the connection r1 between the tow rope 4 and the embedded disc 39 may be broken. In this case, the rear pig 3 is supported at the connection point between the rear support disk 37 and the tow rope 4 -C1]! Although it is said that the pig 3 cannot be pulled out from the Z-stage pipe 1, it is difficult to expand the entire pig 3 even if compressive force is applied to the entire pig 3 due to frictional resistance with the inner surface of the existing pipe 1. Due to the function of the core member 38, the piece 33 exerts a compressive force on the sponge portion 3b of circumference (n) and prevents the diameter from increasing, thereby reducing friction against the inner surface of the existing pipe 1. A rapid increase in the number of cases is unavoidable. In this way, the I-point pig is attached to the tow rope 4 and the embedded disc 39.
In case J is ruptured, the pig 3 can be safely pulled out from the existing piping 1. Once the repair to the spear/joint part 13 is completed, the clamp 8
Remove 2, remove 8 and divide it into two.
] Open the cock 1 and first pour out the resin C on the front side of the front side pig 2, and then forcefully cover the rear side pig 3. Then, loosen bolts 28a and 281+ and remove collar 2.
If you release the fasteners 441 and J of 8 and untie the pig 2 and the tow line 4, making the pig 2 free, and then pulling the tow line 4 with the winch 9, the pig 2 will not move and the pig 3 Only conduit 6
It climbs up inside. At this time, the residual resin is Jjl output%J
'6a, for example, into the container 41. In this case, M8 is split into two parts as shown in the figure, so even if the tow line 4 is wound around the winch, the pig 2,
It does not get in the way of taking out item 3. In this embodiment, the configuration of the present invention was applied to the rear replacement pig 3, but it goes without saying that this configuration can also be applied to a normal through-pig if the same long pig structure is required. It is. Effects of the Invention The present invention has been described in detail above, and an embedded plate is provided between the tip body piece and the body piece, and this is fixed to the tow rope to maintain airtightness on the front side. while also suppressing elongation on the rear side,
Since it can be used while maintaining airtightness without any practical problems and maintaining appropriate sliding resistance, it can be used for the purpose of moving: It is possible to completely carry out repair work, and also has the advantage of reducing traction resistance if it becomes excessive.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention. A schematic diagram of the entire installation system; Figure 2 is a schematic side view showing the replacement pig insertion conduit; Figure 3 is a schematic side view showing the pig extraction conduit; Figure 4 is the pig towing Show status? i Silk section side view, Figure 5 is a half sectional side view of the front pig, Figure 6 is a perspective view of the replacement rear pig, Figure 7 is a half sectional side view of the same, Figure 8 is a front view of the same, FIG. 9 is an enlarged sectional view of the main parts showing the state of resin filling. 1... Existing color scheme, 11.12... Separated end, 13...
・Pipe joint part, 13a...Large diameter part, 131)...Pipe end, 14...Seal material, 15...Lead pit, 17.18
...Grooves, 17a, 18a...Tapered ends, 19
... passage, 2 ... pig, 21 ... body piece, 22 ... fin piece,
23... Head piece, 24. 25... Support disk, 26.
...Stud bolt, 27...hole, 28.29...
Cassie-123a, 29a...Bolt, 28b,
29b... Receiver is seat, 3... Pig, 3a... Core member, 3b... Sponge monthly rate, 31... Head piece, 32... Body tip piece, 33
... Body piece, 34... Rear body piece, 35... Fin piece, 36.37... Support disk, 38... Wire, 3
8a, 38b--Bolt, 38c, 38d
... Natsuto, 39... Rimekomi disk, 39a...
Ritsut~, 4... Towing cable, 40... Supply pipe, 41...
... Container, 5... Pig insertion conduit, 5a... Resin filling port, 51+... Exhaust port, 51... Clamp,
52.53... Cock, 54... Cross bin, 6... Pig outlet conduit, 6a... Discharge port, 61
)...Air pressure supply pipe, 61...Opening/closing cock, 7...Resin filling tank, 7a...Hose, 7b...
- Generator, IC...Compressor, 8...Lid, 81...Guide reel, 82...Clamp, 9...Winch, 9a...Drum, 10...
・Compressor, 10a...pressure operation conit, A,
B... Pit, C9D... Resin.

Claims (1)

[Claims] In the resin transfer pig for repairing existing piping, which airtightly slides inside the pipe and moves the resin placed on the front side along the inside of the pipe, the pig is attached to multiple parts such as the tip body piece and the body piece. These are made of a flexible rubber material, and there is an embedded plate between the tip body piece and the body piece, and this embedded plate is fixed to the tow line and is attached to the pig. The support plate provided at the front end and the embedded plate are connected with bolts and nuts to tighten the tip body piece, and the connection between the embedded plate and the support plate provided at the rear end of the pig is A resin transfer pig for repairing a pipe joint of an existing pipe, characterized in that the body piece is connected with a wire passing through it so as to suppress elongation.