JPS59231291A - 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 relates to a pipe joint for an existing gas pipe that is mainly buried underground, and is repaired so as to ensure sealing performance from the inner surface of the pipe while the pipe joint remains buried. The present invention relates to a half-part repair device.

In recent years, various methods have been proposed for repairing existing pipes such as gas pipes, water pipes, etc. buried underground from the inside so as to regenerate and strengthen the pipes against corrosion while still buried. In particular, for existing gas pipes buried underground, where cast iron pipes are connected using water-type joints or G-type joints, the sealing performance of the pipe joints has deteriorated and there is a need for repair. . 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 "stone skin," but in the case of dry natural gas, the sealing material dried and
Due to shrinkage, voids are created, which deteriorates the sealing performance and causes gas leakage.Therefore, it is necessary to ensure the sealing performance of the pipe joint and to perform repairs to prevent seal deterioration in the future. There is.

Therefore, it has been proposed that a filling chamber formed in the VIG is filled with resin, and when the VIG moves to the pipe joint, the filling pressure applied to the resin is used to fill and repair the pipe joint. . However, since branch pipes are connected to the existing pipes at various places, there is a problem that when the VIG passes through the branch pipe parts, the resin enters into the branch pipe parts and blocks them.

The present invention has been made based on the following two circumstances, and when the end of the branch pipe is left open and the VIG passes through the communicating part of the branch pipe, the positive pressure applied to the VIG is released from the branch pipe. This branch pipe communication point is detected by utilizing the drop caused by leakage, and filling pressure is at least not applied to the resin while the VIG passes through the branch pipe communication point, thereby preventing resin from clogging the branch pipe. The present invention aims to provide a pipe joint repair device for existing pipes that can repair existing pipes.

For this purpose, the present invention provides an air-tight connection to the inner surface of the existing pipe.
The front and rear chambers are configured in a vibrator that moves in motion, with the front chamber serving as a pressure fluctuation chamber and the rear chamber serving as a resin filling chamber.The resin filling chamber has a flexible chamber that can expand its volume. bag i
iQ 4J1 The flexible bag is configured to apply positive pressure to the resin in the resin filling chamber, and is configured to apply positive pressure to the pressure fluctuation chamber. .

Hereinafter, one embodiment of the present invention will be specifically described with reference to FIGS. 1 to 8. In the figure, reference numeral 1 denotes a cylindrical vig, through which a tow rope 2 passes through the center of the interior, and at the front and rear ends of the vig 1 are fixed to supporting disks 3, 3. The vig 1 comprises three vig sections 4° 5.6, front, middle and rear, which are continuous with a small diameter body 7 8 to form a monolithic structure. The first chamber formed between the portion 4 and the middle big portion 5 is used as a pressure fluctuation chamber 11,
A communication passage 9 is provided that passes through the intermediate big portion 5 and communicates with the second chamber near the body.

Also, it passes through the rear side big part 6, and the big part 5,
A positive pressure supply pipe 12 is communicated with the second chamber formed between the compressor 1 and the compressor 1.
It is connected to 3. An inflatable cylindrical flexible bag 1 made of a rubber membrane or the like is placed concentrically between the big parts 5 and 6.
4 is arranged, dividing the second chamber into the inside and outside,
The positive pressure supply pipe 12 is arranged inside the flexible bag 14. The inside of this flexible bag 14 is a pressurizing chamber 15, and the outside is a resin filling chamber 16. Therefore, the pressurizing chamber 15 is communicated with the first chamber 11 via the communication path 9 described above.

As shown in detail in FIG. 2, the intermediate big portion 5 has a resin filling groove 17 on its outer periphery that opens toward the rear in the direction of movement, and a resin filling groove 17 near the front end, with the intention of providing the function described later. The grooves 18 for escaping the substituted substance which extend up to It is formed.

The substitute expelling groove 18 is communicated with a passage 18a that passes through the inside of the vig 1 and opens to the front of the vig 1. A vacuum pump 10 is communicated with this passage 18a via a hose 10a.

Further, as shown in FIG. 3, a magnetic sensor block 19 is fixed to the traction lobe 2 at a predetermined distance in front of the big 1. This magnetic sensor block 19 is provided with a plurality of magnetic sensors 20 at divided positions in the circumferential direction, and a signal 5- transmission cable 21 thereof extends forward. The towing rope 2 is provided with a scale for measuring the length, and is wound around winches 22 and 23 at the front and back, respectively.

The repair device having such a configuration is used in the following manner for repairing the inner surface of an existing pipe. The existing pipe △ buried underground is a long cast iron pipe connected via pipe joints B and C, such as a water pipe type, using a conventional piping method. In repairing the pipe joints B and C of the existing pipe Δ, in the present invention, the existing pipe Δ is divided into units of length suitable for repair.

And, for this section, a plurality of intervening pipe joint parts B,
Repair C is carried out in a series of repairs in one culm, and as is well known in the art, the pipe joint B is connected to the large-diameter part B1 provided at the end of one existing pipe Δ, and the other A connection structure in which the pipe ends B2 of the existing pipe △ are butted against each other, the butt-fitting part is filled with a sealing material usually called [hemp 1lIX], and the frontage is sealed with lead material E. There is a slight gap F left at the abutting ends.

6- The pipe joint part C is fitted with a large-diameter pipe joint member C1 so as to cover the ends of the existing pipes A facing each other, and a sealing material is applied to the fitting part to the existing pipe. It has a connection structure in which the opening is sealed with a lead material, and a small gap F is left in the butt.

Inside the existing pipe △ to be repaired above, from one opening,
The Big 1 is introduced. And in the resin filling chamber 16,
In the present invention, a thermosetting low viscosity resin such as an epoxy resin (for example, 10 cps to 1.0OOcp) is used.
s ) penetrant X, or high viscosity resin (e.g. io,
ooo ~ 300,000 cps) is filled with the filling putty Y, and is transported along with the Vig 1 inside the existing pipe A by being pulled by the pulling row 12.

In the first stage, as shown in FIG. 4, the filling chamber 16 is filled with penetrant x and is moved in the direction of the arrow.

This movement is achieved exclusively by the winding of the traction lobe 2 by the winch 22. During this movement process, when the magnetic sensor block 19 comes to the position of the pipe joint B (or C), all the magnetic sensors 20 react and output a signal, which can be captured on the ground. If only - number of magnetic sensors 20 react, it can be detected that the branch pipe is connected. Based on the confirmation of the position of the pipe joint part B (or C) by this reaction of the senna 20, when the big 1 moves to the position of the pipe joint part B (or C), the big 1 at this position movement is called a pause or slow state. First, at the stage where the intermediate big portion 5 passes through the pipe joint part B (the position where the pressure fluctuation chamber 11 passes through the pipe joint 711B) (see Fig. 4), negative pressure is applied to the groove 18 by the action of the vacuum pump 10. When given, the gap F in the pipe joint B
Negative pressure is applied to the sealing material and the air is sucked together with the dust 4 there. In this state, the grooves 17 and 18 are opposed to the gap F at the outer periphery of the intermediate big part 5. The passage 18a is in communication with the filling chamber 16 through the gap F and the grooves 17 and 18. If air remains in the filling chamber 16,
It is removed by suction using negative pressure. The penetrating agent X in the filling chamber 16 is expanded by the volume expansion of the flexible bag 14 by applying positive pressure from the compressor 13 to the pressurizing chamber 15 inside the flexible bag 14 via the positive pressure supply pipe 12. , filling pressure now (),
The air in the gap F is supplied to the gap F through the groove 17, and the air in the gap F is infiltrated into the sealing material in the process of being drawn by the vacuum pump 10 through the passage 18a due to negative pressure. 15 is preferably supplied with pressurized air of +o, skg/cm2, for example.

At this time, if there is an air leak in the pipe joint B (or C), the penetrant It is expected that the residual air in the sealing material will be trapped due to pressurized penetration of the penetrant X, but in this case, the negative pressure suction force of the vacuum pump 10 will be , the air gap 18 acts on the sealing material, and therefore, the residual air in the sealing material moves around from the gap F in the pipe circumferential direction due to the push-out action caused by the pressurized penetration of the penetrant Since the air escapes to the vacuum pump 10 side through the passage 18 and the passage 18a, the exchange action between the air and the penetrant X is ensured, and the penetrant X is absorbed into the seal material. It penetrates deeply into the entire area.

- When the impregnating effect of the penetrant A on the sealing material of each pipe joint B (or C) is completed, the VIG 1 is again moved within the existing pipe A by being pulled by the traction rope 2.

As shown in FIG. 6, in the process of this movement, a case where the VIG 1 is passed through a location where a branch pipe G is opened to communicate with the existing pipe A will be explained. The end of this branch pipe G is previously exposed to the atmosphere prior to this work. Therefore, when the pressure fluctuation chamber 11 corresponds to the communication opening of the branch pipe G while the VIG 1 is moving, the pressurized air given by the compressor 13 is transferred from the pressurization chamber 15 to the pressure fluctuation chamber via the communication path 9. 11 and is further discharged to the outside through the branch pipe G, and the flexible bag 14 contracts as the pressure in the pressurizing chamber 15 decreases. Therefore, the resin in the filling chamber 1G is pulled toward the flexible bag 14 side. Then, while the pressure fluctuation chamber 11 passes through and the opening of the branch pipe G corresponds to the position of the filling chamber 16, the flexible bag 1
4 begins to gradually dilate because the pressure fluctuation chamber 11 is closed by the inner wall of the existing pipe A. The resin will not be pushed out until the end. The time lag for this can be easily achieved by setting the pulling speed of the pulling row 12, the supply speed of compressed air by the compressor 13, etc.

Of course, a pressure sensor is provided in the pressure fluctuation chamber 11 to detect the pressure drop when passing through the branch pipe G, and then
Control may be performed such as stopping the compressor 13 for a certain period of time or closing the throttle valve while the air passes.

Alternatively, the pressure may be detected by a sensor, and pressurized air may be supplied for a certain period of time from the part of the branch pipe G that is open to the atmosphere. In addition, the pressure sensor is located on the extension of the hose 12.
It may be installed near the ground compressor.

In this way, the resin in the filling chamber 16 is prevented from entering the branch pipe G while passing through the communication opening of the branch pipe G. The penetrant X penetrates into the sealing material of each pipe joint group by passing through such excess culm, but during this time, the residual penetrant X decreases. However, this is the expansion of the flexible bag 14 that can substantially apply filling pressure to the resin until the final stage.

When the impregnating action of the penetrant X in the first stage is completed in this way, the filling chamber 16 is then filled with a putty agent Y of high viscosity as a second stage, and this is combined with the above-mentioned first stage. Move it within the existing pipe A in the same way, and move it to the pipe joint B (or C).
On the other hand, when the Vig 1 moves to a predetermined position, the movement is temporarily stopped or at a low speed, and the putty agent Y is pressurized and filled (see FIG. 7). In this case, the surplus of the previous penetrant X remains in the gap F, but it is sucked and discharged to the vacuum pump 10 side via the groove 18, and filling pressure is applied to the putty agent Y. Therefore, instead of this being drawn, groove 1
The putty agent Y is filled through 7 to realize substitution.

Moreover, the surplus of the penetrating agent Filling can be achieved reliably, and the gap F in the pipe joint part B (or C) can be
Even if the inner surface is rough with unevenness, the putty agent Y has good adhesion, and both the airtight effect and the gap sealing effect can be enhanced.

Further, in this embodiment, the big 1 is composed of an integral structure having two chambers, and the front big part 4. Of course, the intermediate big portion 5 and the rear big portion 6 may be constructed separately and connected to each other.

Further, the hose 10a provided to pass through the VIG 1 may simply be placed in front of the VIG 1 without performing negative pressure suction.

As described in detail above, when passing a VIG into an existing pipe, the present invention first uses negative pressure suction at the pipe joint to remove air from the sealing material and voids in the pipe joint, and immediately after that, the resin is filled at the required filling pressure, and by moving the pig, the pipe joint can be successively repaired from the inside of the pipe, and the pipe joint can be reliably and completely sealed. In addition, in the branch pipe communication section, pressurized air leaks from the pressure fluctuation chamber to the branch pipe, which not only allows confirmation of the branch pipe position but also deflates the flexible bag and prevents the resin from leaking during the passage of the VIG. Since it is possible to prevent the water from entering the branch pipe, it is also possible to prevent clogging of the branch pipe.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is an overall longitudinal sectional perspective view showing a mode of use.
Figures 4 to 6 are partially enlarged vertical cross-sectional views illustrating the penetration state of the penetrant in the first stage, and Figures 7 and 8 are partially enlarged longitudinal sectional views explaining the penetration state of the penetrant in the second stage. FIG. 1... Big, 2... Towing rope, 3... Disc, 4
．． 5゜6... Big part, 1, 8... Torso, 9...
Communication path, 1o...vacuum pump, 10a...hose,
11... Pressure fluctuation chamber, 12... Positive pressure supply pipe, 13...
...Compressor, 14...Flexible bag, 15...
Pressure chamber, 16... Filling chamber, 17.18 Kawamizojo, 18a
...Aisle, 19...Block, 20...Sensor,
21... Cable, 22.23... Winch, A.
...Existing pipe, B...Pipe joint part, B1...Large diameter part,
B2... Pipe end, C... Pipe joint, D... Seal material, E... Lead material, F... Gap, G... Branch pipe, C1.
...Pipe joint parts. 14-

Claims (1)

[Claims] The VIG, which slides in airtight contact with the inner surface of the existing pipe, is configured with a front and back double structure, with the front chamber serving as a pressure fluctuation chamber and the rear chamber serving as a resin filling chamber. A flexible bag capable of volume expansion is provided, the flexible bag is configured to apply positive pressure to apply filling pressure to the resin in the resin filling chamber, and the positive pressure is applied to the pressure fluctuation chamber. A pipe joint half repair device for an existing pipe, which is characterized by: