JPS6314669B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be used as a pre-treatment for repairing existing pipes such as gas pipes buried underground, especially for seal repair of pipe joints of existing pipes. This invention relates to a cleaning device for pipe joints.

[Prior art] In existing pipes such as gas pipes and water pipes in which cast iron pipe bodies are connected by so-called water pipe joints,
In order to ensure the sealing performance of the pipe joints interposed in the pipes, repairs are carried out by filling the gaps in the joints with resin.

In this case, the tar that accumulated in the existing pipes when coal gas was used in the past dries up and becomes dust when switching to natural gas, and this dust accumulates in the gaps at the pipe joints. The sealing material itself, which is called "hemp skin", that is interposed in the pipe joints dries and weathers, causing dust to accumulate in the gaps at the pipe joints. In this case, resin filling into the pipe joint portion will not be performed properly.

Therefore, prior to this repair work, it is common to insert a wire brush into the existing pipe to clean the inner surface of the pipe, but this method of cleaning the inside of the pipe removes fine particles and powder generated during the cleaning process. dust gets into the gap between the pipe fittings.

In order to remove this dust, a method has previously been proposed in which the dust is removed by spraying pressurized fluid into the pipe through a pig. An example of this method is explained in Fig. 1. Pig a has a fluid passage b that blows pressurized fluid supplied from the rear toward the front of the pig, and the tip of the fluid passage b extends diagonally in a radial direction. It is directed towards.

[Problems to be Solved by the Invention] In the case of the cleaning shown in FIG. This is only a fluid jetting effect and does not work to completely eliminate the dust in the gap d by causing it to flow in the discharge direction using pressurized fluid, so the dust cannot be removed reliably and there is no sufficient pipe There was a problem in that it was difficult to expect dust to be cleaned from the joint.

[Means for Solving the Problems] The present invention has been proposed to address the above-mentioned problems, and involves making the dust accumulated in the gap d of the pipe joint part c flow in the discharge direction using a pressurized fluid. It is an object of the present invention to provide a cleaning device for a pipe joint part that can reliably and completely remove dust.

For this purpose, the present invention relates to a pig introduced into an existing pipe. In addition, a fluid outlet opening toward the fluid supply side at the rear end of the pig and a dust suction opening toward the front end of the pig are provided on the circumferential surface of the pig body between the front and rear lip portions. When the pig passes through the position of the pipe joint part, the fluid discharge port and the dust intake port are opened to each other through the inner annular gap of the pipe joint part. It is characterized by having a structure that communicates with each other.

[Function] With this configuration, when the pig passes through the pipe fitting, pressurized fluid supplied from the rear of the pig flows through the inner cavity of the pipe fitting from the fluid discharge port on the circumferential surface of the pig. The pressurized fluid detours and circulates from the dust inlet to the front of the pig, and as a result, the pressurized fluid detours and flows through the inner gap of the pipe joint, removing the dust that has accumulated in the gap. By applying fluid pressure to the pipe, fluidity can be applied to push the dust out from the dust suction port towards the front of the pig, so dust accumulated in the gap in the pipe joint can be reliably discharged and removed. is obtained.

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIG. 2 and the following drawings.

In the figure, reference numeral 1 denotes a cleaning pig having a cylindrical shape, and is made of a synthetic rubber material having flexibility and elasticity.

This pig 1 has annular lip portions 11, 12 and 13 located on the front and rear sides of the circumferential surface of its body.
14 are formed.

In addition, the pig 1 has a main body circumferential surface between the front and rear lip parts 12 and 13, which is provided through passages 2 and 3 toward the rear end of the pig 1 (the pressurized fluid supply side). The opened fluid discharge ports 15 and 16 and the passage 4,
Dust inlets 17 and 18 are opened toward the front end of the pig 1 through the pipe 5, and the dust inlets 17 and 18 are opened with a phase shift in the circumferential direction, and the pipe 1 is connected to the pipe interposed in the pipe line of the existing pipe A. When corresponding to the position of the joint part F, the fluid discharge ports 15, 16 and the dust intake ports 17, 1
8 are configured to communicate with each other via an annular gap I formed inside the joint portion.

Reference numeral 6 denotes a towing cable for pulling the pig 1, which is fixed to support plates 7 and 8 provided at the front and rear ends of the pig 1. A wire brush 9 is attached to the front of the pig 1 in the direction of movement, and is fixed to the tow rope 6.
The base portions of steel wire rods 92 and 93 are fixed to the wire rod 1, and the tip portion has a cylindrical shape as a whole with a small diameter.

As shown in Figure 2, the existing pipe A is divided into repair sections of a predetermined length, and both ends are separated and exposed in vertical shafts B and C, where guide pipes D and E are installed, respectively. are connected by clamps. Then, the tow cable 6 is introduced from one guide tube D, and after passing through the existing pipe A, it is led out from the guide tube E on the opposite side and a winch 94 is installed on the ground.
It is wrapped around.

Then, by winding the winch 94, the tow rope 6
When the wire brush 9 and the pig 1 are pulled, the wire brush 9 and the pig 1 are introduced into the existing pipe A. The wire brush 9 moves within the existing pipe A while being forcibly turned by the extension of the twisted wires of the tow rope 6, and of course, a separate means for turning the wire brush 9 may be provided.

Pipe joints F are interposed in the existing pipe A at predetermined pitches in the pipe line. This pipe joint part F has a structure in which one pipe end F1 is inserted into a large diameter part F2 formed at the other pipe end, and the part is filled with hemp skin G and sealed with a lead material H. , an annular gap I is left inside. Dust accumulates in this gap I as described above.

As the wire brush 9 and the pig 1 move through the existing pipe A, the tip of the preceding wire brush 9 applies a crushing effect to the dust accumulated in the gap I. Pressurized fluid (pressurized air in the embodiment) is supplied into the pipe behind the pig 1 from a compressor 95 installed on the ground via a guide tube D on the rear side in the traveling direction of the pig 1.

This pressurized fluid is brought from the rear end of the pig 1 to the fluid discharge ports 15 and 16 via the passages 2 and 3, and is discharged into the outer peripheral space of the body of the pig 1, which is partitioned by the lip parts 12 and 13. .

Therefore, when the pig 1 passes through a position corresponding to the pipe joint part F interposed in the pipe line while the pig 1 is moving, the pressurized fluid released from the fluid discharge ports 15 and 16 is transferred to the pipe joint part F on the outside thereof. The pressurized fluid is blown directly into the inner annular gap I, and further this pressurized fluid detours through the annular gap I to direct the dust in the gap I toward the dust inlets 17 and 18 on the other side. It flows as if being pushed out, and flows as if being blown out in front of the pig 1 via the passages 5 and 6.

As a result, even if the inner annular gap I of the pipe fitting F is recessed in the pipe, the pressurized fluid detours through the annular gap I, applying fluid pressure to the dust accumulated in the annular gap I. Since the dust can be given fluidity so as to be pushed out from the dust suction ports 17 and 18 toward the front of the pig 1, the dust accumulated in the inner annular gap I of the pipe joint F can be reliably removed. It can be discharged and removed, and the pipe joint part F can be cleaned accurately.

In addition, the dust blown out in front of the pig 1 from the dust inlets 17 and 18 is sequentially pushed in the direction of travel by the pig 1 as the pig 1 moves forward, and is pushed out from the other end of the pipe. Since the dust is taken out of the tube, the dust is automatically removed from the tube.

In this embodiment, the pressurized fluid is supplied from the rear, but a means for suctioning the dust forward by applying the suction force of the vacuum pump to the front may be added.

[Effects of the Invention] Since the present invention has the configuration described above, the following effects can be obtained.

First, when the pig 1 passes through a position corresponding to the pipe joint while moving through the pipe, the pressurized fluid supplied from the rear of the pig 1 flows through the fluid discharge port 15 opened on the circumferential surface of the body of the pig 1. 16 directly into the inner annular gap I of the outer pipe joint part, and this pressurized fluid detours through the annular gap I to transfer the dust in the gap to the other dust suction. As a result of the flow being pushed out from the ports 17 and 18 to the front of the pig 1, even if the inner annular gap I of the pipe joint is recessed in the pipe, the inner annular gap I
By bypassing and circulating the pressurized fluid inside, fluid pressure is applied to the dust accumulated in the annular gap I, and the dust flows so as to be pushed out from the dust suction ports 17 and 18 toward the front of the pig 1. Therefore, the dust accumulated in the inner annular gap I of the pipe joint can be reliably discharged and removed, and the dust of the pipe joint can be accurately cleaned.

In addition, the dust blown out from the dust inlets 17 and 18 to the front of the pig 1 is moved to the side of the fluid discharge ports 15 and 16 due to the existence of a lip provided on the circumferential surface of the body of the pig 1. As the pig 1 moves forward, the dust is not sucked in, but is pushed in the direction of travel by the pig 1 and taken out of the pipe, so dust can be automatically removed from the pipe. It is also possible to eliminate inconveniences such as dust accumulating again in the inner space of the pipe joint after the pig 1 has passed.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view of a conventional example, FIG. 2 is an overall schematic vertical side view showing an embodiment of the present invention, and FIG.
The figure is an enlarged sectional view of the main part, and FIG. 4 is a perspective view of the main part of the pig. 1... Pig, 11, 12, 13, 14... Lip part, 15, 16... Fluid discharge port, 17, 18...
...Dust inlet, 2, 3, and 4, 5... Passage, 6... Traction cable, 7, 8... Support plate, 9... Wire brush, 91... Core metal, 92, 93... Made of steel Wire rod, 94...Winch, 95...Compressor, A...Existing pipe, B, C...Vertical shaft, D, E
...Guide tube, F...Pipe joint part, F1...Pipe end,
F2...Large diameter part, G...Hemp skin, H...Lead material, I
...Inner annular gap of the pipe joint.

Claims (1)

[Scope of Claims] 1. A method for cleaning pipe joints interposed in a pipe line during the movement of the pig by inserting a pig into the pipe of an existing pipe and supplying pressurized fluid from the rear of the pig, the above-mentioned pig In addition, a lip part is provided on the front and rear sides of the cylindrical body circumferential surface to maintain airtightness by slidingly contacting the inner surface of the existing pipe, and a pig body is provided on the circumferential surface between the front and rear lip parts. The fluid discharge port, which opens toward the fluid supply side at the rear end, and the dust intake port, which opens toward the front end of the pig, are opened with a phase shift in the circumferential direction, so that the pig can adjust the position of the pipe joint. An apparatus for cleaning an existing pipe joint part, characterized in that the fluid discharge port and the dust suction port are configured to communicate with each other via an inner annular gap of the pipe joint part when passing through the pipe joint part.