JPS59151694A - Device for repairing pipe joint section of existing pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a pipe joint part of an existing gas pipe buried underground, which ensures sealing performance from the inner surface of the pipe while it is buried. This relates to a joint repair device.

In recent years, various methods have been devised to repair existing pipes, such as pipes buried underground, such as water pipes, from the inside, so as to prevent corrosion and other damage from regenerating the pipes while they are still buried.

In particular, with existing gas pipes buried underground, where cast iron pipes are connected using water-type joints or G-wall joints, the sealing performance of the joints has deteriorated, making it necessary to repair them. . -In other words, recently, city gas has become dry natural gas instead of the coal waste that has been used for a long time, and in the case of conventional coal gas, tar components in the gas are interposed in pipe joints. However, in the case of dry natural gas, when the sealing material dries,
Due to the shrinkage, voids are created, which deteriorates the sealing performance and causes gas leakage. Therefore, it is necessary to ensure the sealing performance of the joint and perform repairs to prevent seal deterioration in the future. ing.

However, existing gas-colored medium-diameter pipes and small-diameter pipes,
Since it is not possible to repair the inner surface of the pipe joint with a dog [1], it is difficult to perform repair work on the inner surface of the pipe joint. A construction method in which workers are located outside to repair the inner surface is desired.

Regarding this construction method, the present inventor has installed
Resin is filled between at least a pair of front and rear vigs that are in airtight contact with the inner surface of the tube and cover the sliding contact (having means for movable).
During this movement process, when the pipe joint is located between the front and rear pipes, in the first stage, a low-viscosity resin penetrant is impregnated under pressure into the sealing material from the gap in the joint, and in the second stage, the pipe joint is impregnated with pressure. We have developed a repair method that fills the gaps with a high-viscosity resin putty. According to this repair method, the worker is outside and j! 2
Not only can the inner surface of the pipe joint be repaired in the 82 condition, but the penetrating agent pressurized and impregnated into the sealing material closes the micropores caused by drying and shrinkage of the sealing material, increasing the sealing effect. Moreover, since the agent that penetrates into the gap in the first stage acts as a lubricant for the filling of the putty agent in the second stage, the gap surface of the pipe joint part is a rough surface with irregularities. Even when using a patch, the filling adhesion of the putty agent is good, and the double airtightness of the penetrating agent and the putty agent achieves repair with a high sealing effect.

The present invention is a repair device used to carry out the above-mentioned repair method, and when a pair of front and rear pigs is moved inside an existing pipe, filling pressure is not applied to the resin, and the pig is temporarily held at the position of a pipe joint. When stopping or controlling the speed to a low speed, the rear pig is elastically pulled forward and filling pressure is automatically applied to the resin, and when moving, the rear pig is designed to reliably follow the front pig. The purpose of this project is to provide a pipe joint flat repair device for existing pipes.

For this purpose, the present invention has a means for filling the inside of the existing pipe with a resin between at least a pair of front and rear pigs that slide in airtight contact with the inner surface of the pipe to prevent the pigs from moving. , When the rear side Vig is connected to the front side Vig via an elastic body such as a coil spring that exerts an elastic force in the direction of approaching each other, and the front side Vig is temporarily stopped at the position of the pipe joint part or is controlled to speed up at low speed, The rear vig moves in the direction of the front vig due to the tensile traction force of the elastic body, applying filling pressure to the resin interposed between the front and rear vig, and connects the connecting lobes extending from the front vig to prevent it from retreating backwards. On the other hand, it is characterized in that the rear side vig is connected to the front side vig via a locking mechanism such as a one-way latch.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

Figure 1 shows the earth body part of the repair device according to the present invention.
In the figure, 1 is the front vig, and 2 is the rear vig. These pigs 1 and 2 are cylindrical in shape and have an outer diameter that corresponds to the inner diameter of the existing pipe 12 to be repaired and can slide in airtight contact with the inner surface of the existing pipe 12. On the outer periphery of the front side big 1, in order to provide the function described later, a suction groove 3 extending 1 inch toward the tip side and an iM groove 4 opening toward the rear side overlap each other in the axial direction. They are formed in a wrapping relationship and at different positions in the circumferential direction. In addition, the outer diameter Xj of the rear side big 2 is made slightly smaller than that of the front side big 1 so that the sliding movement resistance when moving inside the pipe is smaller.
A fin portion 2a for maintaining airtightness protrudes from the outer periphery of the rear end.

Regarding the pair of front and rear pigs 1 and 2, the front side big 1 is connected with traction [I-beams 5 and 6] which also serve as sub-lengths in the forward and rearward directions 4J in the direction of movement, and a lobe 6 extending rearward. The rear big 2 passes through the center of the rear big 2, and the rear big 2 has a sliding function with respect to the row 16. In the present invention, the rear side vig 2 is connected to the rear side vig 2 via the coil spring 7 so that an elastic force acts in a direction in which the rear side vig 2 approaches the front side vig 1.
is connected to the front side big 1, and the rear side big 2 is pulled forward by the tensile traction force of this coil spring 7, and the resin (penetrating agent △ or putty agent B described later) is interposed between both bigs 1.2.
The rear big 2 is connected to the row 16 extending rearward from the front big 1 via a locking mechanism 8 such as a one-way clutch.
(It is configured so that it does not retreat backwards.

The repair device having such a configuration is used in the following manner for repairing the inner surface of existing color 12. Here, the existing pipe 12 buried underground is connected to a cast iron pipe using a conventional piping method, and a pipe joint 13 of a water type or the like is connected. 1% is connected via III. In repairing the sparrow joints 13.14 of the existing iu @ 12, the present invention divides the existing pipe 12 into units of length suitable for repair, and divides the pipe joints 13.14 of the plurality of pipe joints 13.14 intervening within that section. The pipe joint part 13 is for repair, and as is conventionally known, the pipe joint part 13 is, for example, a large joint part 13a provided at the chamber end of one pipe, and a pipe joint part 13a provided at the chamber end of one pipe.
3b are butted against each other, and the mating part between the two is usually F.
Seal called Ishihada-1) Al! i is packed, and the frontage is sealed with a lead material 16 up to the connection WI.

With respect to the existing pipe 12 to be repaired, the vigs 1 and 2 are introduced into the opposing space of both the vigs 1 and 2 filled with tree oh from the frontage of one side. Here the resin is the first
In the step, a penetrating agent A of a low viscosity resin (100 cps to 1.0 OO cps) having hardenability such as an epoxy resin is used, and in the second step, a high viscosity resin (for example 100,000 cps) is used.
s~300,000 cps) is filled with putty agent B, and by pulling the towing rope 5 and acting on the negative 1,
inside in the direction of arrow X.

Now, to explain the tMI example in detail, in the first stage, as seen in Fig. 1 J5 and Fig. 2, penetrant △ is filled between the bigs 1 and 2 and moved in the direction of the arrow X. . This movement causes a predetermined negative pressure from the vacuum comb bomb 20 to be applied to the existing pipe 12 on the front side in the moving direction (for example, a voltage of -0,5 is applied).
112), the front side big 1 is pulled by winding the towing rope 5 by the winch 21, and the rear side big 2 is pulled by the front side big 1 via the coil spring 7, and the big 1, Penetrant A moves in the tube together with 2. During this movement, J: Because the recoil spring 7 stretches in the direction of extension, the tensile traction force by the coil spring 7 does not work, and the front and rear The filling pressure from the rear side Vig 2 does not act on the penetrating agent Δ filled between the Vigs 1 and 2.

During this movement process, judging from the piping diagram and the extension length of the towing rope 5, or by installing a video camera or magnetic sensor 18 on the towing rope 5,
Alternatively, check the position of 14, and based on that judgment, when the front big 1 moves to the position of the pipe joint 13 (or 14) as shown in FIG.
The speed of movement is temporarily stopped or slowed down.

Due to this speed control, the rear side big 2 is rapidly drawn toward the front side big 1 by the tensile traction force of the coil spring 7,
Since the opposing distance between the two pigs 1 and 2 becomes narrow, the filling pressure from the rear side big 2 acts strongly on the penetrant A filled between the two pigs 1 and 2.

[In this state, a predetermined pressure (for example, +0.5k (1/
cm2) of pressurized air pressurizes the rear VIG 2 in the direction of arrow Y, thereby applying sufficient filling pressure to the penetrant Δ. As a result, as shown in FIG. 3, the penetrant A is forced into the pipe fitting 13 through the groove 4 on the outer periphery of the front big 1, and penetrates into the sealing material 15 through the gap 19 of the pipe fitting 13. Ru.

At this time, if there is an air leak in the pipe joint 13 (or 14), the penetrant A will push out the residual air in the sealing material 15 to the outside and penetrate, causing an air leak. If not, seal month 15 by pressurized penetration into the penetrant.
The residual air inside will be trapped, but in this case, the front big 1 has a groove 3 that opens forward.
Is the residual air in the seal material 15 penetrating as shown in Figure 4? Due to the extrusion action caused by pressurized infiltration of 11△, it rotates from the gap 19 in the pipe circumferential direction and escapes through the groove 3 into the space in front of the face-side big 1, so that the displacement action into air and penetrant is ensured. As a result, the penetrating agent A is deeply penetrated into the entire area of the sealing material 15.

Penetrant A for one pipe joint part 13 (or 14)
After the impregnation action is completed, the Vig 1.2 is again moved within the existing pipe 12 by the aforementioned negative pressure and the traction of the row 15. During this movement, there are curved sections in the existing pipe 12, and there are various protrusions inside the pipe and steps caused by different pipe diameters, and these may cause local damage when the till pig 2 is pulled 11. However, in the case of the mouth, the rear piku 2 is connected to the lobe 6 that extends rearward from the front piku 1.
Since they are connected via a locking mechanism 8 such as a one-way clutch, and backward retreat is regulated, the rear side vig 2 can reliably follow and move with respect to the front side vig 1.

After the impregnating action of the penetrant A in the first stage is completed in this way, in the second stage, the opposing space of the Vig 1.2 is filled with a high viscosity resin putty agent B, and this is applied as described above. The pipe joint 13 (or 14) is moved within the existing pipe 12.
In response to I, Big 1.2 moved to the relative position in Figure 1;
5. At this point, pause the movement or press [(Set to speed state,
The gap 19 of the pipe joint part 13 is filled with a putty agent. In this case, a surplus of the previous penetrant A remains in the gap 19, but as shown in FIG. Since the force acts and the filling pressure is applied to the putty agent B, the putty agent is replaced and filled into one gap through the grooves 4.

In this construction method, the penetrating agent A that is impregnated under pressure in the first stage acts as a lubricant for the filling of the Φ putty agent B in the second stage. Even if there is a problem, resin filling can be achieved reliably, and the adhesion of putty agent B is good even if the gap surface of the joint part is uneven and rough, and the double layer of penetrant A and putty agent B is Repairs with high sealing effect can be achieved due to the airtightness of the sea urchin (see Figure 5).

Incidentally, during the work of penetrating the penetrant A into the sealing material 15 described above and filling the putty agent B into the gap 19, the Vig 1
, 2 need to pass through the elbow part of the existing pipe 12, etc. At this time, since both the pigs 1 and 2 are connected by the coil spring 7, the device can be bent, and it can pass through the curved part of the existing pipe 12. There is adaptability to

Furthermore, by appropriately selecting the tensile force of the coil spring 1, it is possible to omit the supply of pressurized air to the rear space of the rear big 2 when filling the penetrating agent Δ or the putty agent B.

d3 In the above embodiment, pneumatic pressurization and suction were used as means for moving the Big 1 and filling the resin, but it goes without saying that the degree of the pneumatic pressure can be adjusted depending on the situation. Moreover, the suction action may be omitted.

As described in detail above, the present invention fills a resin (penetrating agent or putty agent) between a pair of front and rear bigs, passes this into an existing pipe, and applies filling pressure to the resin at the pipe joint of the existing pipe. When repairing the pipe joint, the rear big
The J side pig is elastically pulled by a 21 spring, and when the J3 is placed at the joint and the front side pig's movement is temporarily stopped or the speed is controlled to a low speed state, filling pressure is automatically applied to the resin. Because of this, it is possible to infiltrate and fill the pipe joints of existing pipes with resin using a simple device, and since the rear pig is restricted from retracting to the rear, the big Even if there is a traffic obstruction during the movement of (15), it is possible to reliably move the rear side pigs to follow the front side pigs, and furthermore, if the resin amount hζ decreases due to resin penetration and progress of filling work, the The rear big is sequentially moved forward in response to the amount of reduction and held in the moving position, which eliminates the inconvenience of creating a gap in the resin filling space, allowing the resin to penetrate into the pipe joint and ensure smooth filling action. Moreover, the effect of a hat that can be carried out reliably can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway longitudinal side view of an embodiment of the present invention, Fig. 2 is a perspective view of the whole longitudinally sectional view, Figs. The figure is a perspective view of the front side vig. 1...-front side big, 2...rear side pig, 3, 4...
groove, 5.6... traction lobe, 1... coil spring,
8... Locking R structure, 12... Existing pipe, 13.14...
・Pipe joint part, 13a...Large diameter part, 13b...Stub end, 15...Seal material, 16...Lead material, 18...Senna, 19...Gap, Δ... Penetrant, B/reputation agent. Patent Applicant: Hakko Co., Ltd. Agent Patent Attorney: Nobu Kobashi Ukiyo Patent Attorney: Susumu Murai Figure 6 Procedural Amendment (Voluntary) 1. Indication of the case 1982 Patent Application No. 025750 2. Name of the invention Existing management Pipe flat section repair device 3, relationship with the case of the person making the amendment Patent Applicant: OX-, 34, Takaban 1-10, Meguro-ku, Tokyo, Agent 5, Drawings to be amended - Drawing 6, Contents of the amendment As shown in the attached sheet (the drawing is correct, no changes have been made to the contents) =575-

Claims (1)

[Claims] In the existing pipe, at least a pair of front and rear vigs that slide in airtight contact with the inner surface of the pipe are filled with resin, and a means for preventing movement is provided.
If the rear side vigs are connected to each other via an elastic body such as a coil spring because of the elastic force in the direction of approaching each other, and the front side vig is temporarily stopped at the position of the pipe joint or the speed is controlled to a low speed, the rear side vig will move toward the elastic body. It moves in the direction of the front vig due to the tensile traction force and applies filling pressure to the resin interposed between the front and rear vig, and a latch etc. An IL for repairing a pipe joint part of an existing pipe, which is characterized by connecting a rear side vig to a front side vig via a locking mechanism.