JPS60220293A - Repairing device for pipe joint 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 for an existing gas pipe that is repaired underground so as to maintain sealing performance from the inner surface of the pipe while the pipe joint remains buried. This is related to flat part repair.

In recent years, existing pipes such as gas pipes and water pipes that have been buried underground have been rebuilt to prevent corrosion while still buried! 1: Various methods have been proposed for repairing from the inside. Especially in the basement J! I! In the case of existing gas pipes in which cast iron pipes are connected by water-type joints or G-type joints, the sealing performance of one part of the joint has deteriorated, making it necessary to repair it.

In other words, recently, city gas has become dry natural gas instead of the coal gas that had been used for a long time, and in the case of conventional coal gas, the tar component in the gas was inserted into the pipe joint. Deterioration of sealing performance was not a particular problem because it penetrated into the sealing material called "Maho", but in the case of dry natural gas, the sealing material dries and contracts, creating voids. Since the sealing performance deteriorates and causes gas leakage, ensure the sealing performance of the pipe joint, and from now on,
There is a need to carry out repairs that will not cause seal deterioration.

But with existing gas pipes? ! With medium-diameter pipes and small-diameter pipes, it is difficult to carry out repair work because the work cannot be done inside the pipe and repair the inner surface of the pipe joint like with large-diameter pipes. In the Ω state, the worker is outside,
There was a need for a construction method that could repair the inner surface of pipe joints.

Regarding this construction method, a repair device as shown in Figure 1 was first advocated. In other words, the first
A resin is placed between the two Vigs through the Vig 1 and the second Vig 2, and by pulling a tow loaf 3 connected to the Vig 2 through the Vig 1, filling pressure is applied to the resin, The first big 1 has a replacement rI44 that communicates forward and a filling WIJ5 that communicates tangentially on the outer circumference.
At the pipe joint part B, air etc. in the pipe joint part B is discharged through the replacement groove 4, and at the same time, the resin between the bigs 1 and 2 is discharged into the pipe joint part through the filling groove 5. Fill it up. In this case, the resin subjected to the filling pressure between the first bigs 1 and 2 has a viscosity between it and the inner wall of the pipe. This viscous resistance increases as the traction speed increases. Furthermore, if there is a branch pipe that communicates with the existing pipe A, there is a risk that the resin will enter that area and solidify, thereby interfering with the flow of the branch pipe. Therefore, measures were taken to prevent the resin from coming into contact with the inner wall of the pipe, except for the first one corresponding to the pipe joint between the pipe joints. However, if the pulling speed is subtracted by 1 for the purpose of shortening the mulberry cultivation time, the resin filled into the flat space of the pipe joint through the filling groove becomes insufficient, making it difficult to ensure sealing performance. <Eru.

The present invention is based on the above two circumstances. , At the rear, between the inner wall of the GJ1 pipe and the resin, there is no viscous resistance of 41 degrees to the movement of the VIG.
In addition to achieving efficient traction, sealing performance is also ensured! ? The purpose of this project is to provide a repair device for existing IAM-1 parts that can be repaired.

To this end, the present invention provides the first vig and fy! Immediately after the first vig in a system in which filling resin is inserted between the second vig and the resin in the pipe joint part is replaced by the first vig while pulling the second vig toward the first vig side. A flexible bag was constructed between the resin between the pipes and the inner surface of the tube, leaving a predetermined space between the pipes. This is a characteristic feature.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6. In the figure, reference numeral 11 denotes a first big, which has a cylindrical shape and has an appearance with a closed end. The material is made of soft sponge-like resin, and on its outer periphery, a replacement WIJ 12 and a filling groove 13 are formed.
They are alternately arranged at equal intervals in the circumferential direction. The above-mentioned replacement groove 12 is a passage for lubrication inside the vig (for example, a vibrator, etc.)
The filling groove 13 communicates with the internal hollow portion 16 via a communication hole 15.

A traction row 117 is slidably inserted through the center of the vig 11, and a second vig 18 is connected to the rear end of the traction row 17. This VIG 18 is also made of the same material as the first VIG 11, and has a solid cylindrical shape. A bag that does not substantially inflate in the radial direction but expands and contracts in the longitudinal direction, for example, in the form of a bellows, is provided at a certain distance behind the big 11 to the front end of the big 18. A tubular body 19 is provided. The front end of this bag 19 is connected to a ring 20 that can elastically slide into contact with the wall of the existing pipe A, and the gap between the ring 20 and the big 11 extends in the circumferential direction of the big. Connecting rods 21 are installed at multiple locations at equal intervals. - Then, inside this bag body 19, between the above-mentioned bigs 11 and 18,
Filled with resin.

Next, a situation in which the pipe joint of the existing pipe A is repaired using the above-mentioned repair device will be explained. The existing pipe A buried underground here is a long cast iron pipe connected via a pipe joint part B, such as a water pipe type, using a conventional piping method.

When repairing the pipe joint part B of the existing pipe A, here,
The existing pipe A is divided into units of length suitable for repair, and a plurality of pipe joints B interposed within that section are repaired. A large opening T! The end B2 of the other tube is brought into contact with the part B1, and a sealant C, which is usually called "hemp skin", is filled in the butted fitting part, and the opening is sealed with lead material. It has a connection structure consisting of:

The above-mentioned bigs 11 and 18 are introduced into the existing pipe Δ to be repaired through one opening 6, with the bag body 19 between both the pigs being filled with resin. This resin is used in the first stage C, for example, a low viscosity resin with hardening properties such as epoxy resin (10 cps to 1, 0OOCI
) S ) is filled with the penetrating agent is moved in the direction of the arrow. During this movement, Pig 11
It is good to have negative suction pressure in front of the. As the second big 18 is pulled forward by the pulling of the loaf 17, the filled resin (X or Y) exerts a compressive force LJ between the bigs 11 and 18, increasing the internal pressure.

This internal pressure causes the first big 11 to be pushed forward.

To explain the construction example in four parts, the first one is big 11°18
When the first pig 11 reaches the pipe fitting part B, the penetrating agent
Air is drawn out from the internal space and the sealing material C, and the penetrating agent X h is introduced therein from the filling groove 13 . This situation is illustrated in FIG.

In short, in the pipe joint B, air and resin are exchanged in the circumferential direction, and the seal IJC is impregnated with the penetrant X, and the penetrant X occupies the internal space. I]- Even if the pull of the pipe 17 is fast and the movement of the pipe 11 is too medium, the resin under filling pressure will come into contact with the pipe wall between the pig 11 and the ring 20 immediately after passing the pig 11, and The filling pressure is maintained (at t, insufficient filling of the internal space of pipe joint B is completely avoided. A series of filling operations were performed for several pipe joints B. Next, the putty agent Y is filled between the pipes 11 and 18, and introduced into the existing pipe A in the same manner as described in Section 2.Then, in the pipe joint part B, the putty agent Y is infiltrated from the replacement groove 12. The surplus of the putty agent is discharged, and the internal space of the pipe joint part B is filled with the putty agent Y through the filling groove 13.If there is a shortage, putty agent Y
When the gap between the first ring 20 and the first ring 20 passes through the pipe joint part B, this can be completely compensated for and perfect sealing performance can be ensured. Furthermore, due to the function of the bag body 19, the resin is prevented from coming into direct contact with the inner wall of the existing pipe △ outside of recovery with the Big 11 ring 20, and therefore losses such as viscous resistance are avoided. Moreover, the effect of suppressing resin intrusion into branch pipes can be obtained.

As described in the above group), the present invention surrounds the resin filled between the pigs with a bag body, and substantially covers the portion where the resin contacts the inner surface of the pipe within a predetermined distance immediately after the first pig. This prevents the traction resistance from increasing due to the viscosity of the resin during the moving process of the pig.Also, to improve workability, even if the pig is moved within the existing pipe relatively quickly, it will not cause damage to the pipe joint. This has the effect that the resin filling will not be insufficient (because the resin filling will be insufficient), and that it can be completely filled immediately after the first injection, and a reliable sealing performance can be obtained.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view showing the usage mode of the repair device that has already been proposed, Fig. 2 is an enlarged perspective view of the main part showing one embodiment of the present invention, and Fig. 3 is a longitudinal sectional side view showing the same usage mode. 4 to 6 are enlarged longitudinal sectional side views showing various aspects of the construction state. 11... First pig, 12... Replacement groove, 13...
・Filling groove, 14... Passage, 15... Communication hole, 16
... Internal hollow part, 17 ... Towing rope, 18 ... Second pig, 19 ... Bag body, 2
0...Ring, 21...Connecting rod, △...Existing pipe, B...1 pipe joint part, B1...Large diameter part, B...
・End, 0... Seal 4A, D... Lead material, X... Penetrant, Y... Putty agent. Patent Applicant Ne1 Co., Ltd. Hakko Agent Patent Attorney Small +a Shin Ukata Patent Attorney Tsuki Susumu 10-

Claims (1)

[Claims] A filling resin is put between the first and second vigs, and the resin in the pipe joint part is replaced with the first vig while the second vig is pulled toward the first vig. , a visible bag is provided between the resin and the inner surface of the pipe, leaving a predetermined space immediately after the first vig, so as to substantially avoid frictional contact between the two parts; A pipe joint flat section repair device for existing pipes featuring: