JPS631913B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lining device for lining the inner surface of a gas pipe to repair or reinforce the pipe.

[Conventional technology] For example, when a leak occurs in a supply pipe that branches from a city gas low-pressure main pipe and supplies gas to a gas demand end such as a building and requires repair, conventionally, the leakage point is dug up and repaired. This is a large-scale operation, requiring a long time and a large amount of cost. In addition, as seen in Japanese Patent Publication No. 39-9312, when repairing a buried water pipe, both ends of the water pipe are cut,
A method has also been proposed in which paint is applied to the inner surface of a tube by inserting a paint applicator using sponge rubber into the tube.

[Problems to be Solved by the Invention] However, when repairing a gas pipe, the gas supply to the gas main pipe cannot be shut off even during the repair work. For this reason, the repair work of gas supply pipes branching from the gas main pipe is a very difficult work, and the above-mentioned prior art (Japanese Patent Publication No. 39-9312)
In many cases, it is impossible to repair a pipe by cutting both ends of the pipe.

In addition, in order to simplify repair work, a lining agent is injected into the pipe from the opening at one end of the pipe and adheres to the inner surface of the pipe, forming a lining layer to repair leaks and strengthen the inner surface of the pipe. It was also possible to do something like this. In this case, it is desired to apply a lining agent to the inner surface of the pipe with a uniform thickness, but there has been no suitable lining device so far, and the development of one has been desired.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to enable a uniform lining layer to be formed on the inner surface of a gas pipe by a simple operation from the opening at one end of the gas pipe.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a gas pipe which is inserted into the gas pipe 1 to be lined from the one end opening 1a side, and has elasticity. A substantially spherical sponge-like lining agent-impregnated body 4 having an outer diameter larger than the inner diameter of the impregnated body 4; A pair of presser plates 7, 8 forming a A liquid feeding tube 5 having a through hole 6 for exuding the lining agent 11 into the impregnated body 4
and one end opening 1a of the gas pipe 1 connected to the other end side of this liquid feeding tube 5 and via the liquid feeding tube 5.
A lining agent supply mechanism 10 that supplies the lining agent 11 to the impregnated body 4 from the side, and an opening 1a at one end of the gas pipe 1 at a pressure higher than the internal pressure of the gas pipe 1 when the impregnated body 4 is inserted into the gas pipe 1. It is equipped with a gas supply means for feeding gas toward the impregnated body 4 from the side.

[Operation] When inserting the impregnated body into the pipe in the lining device configured as described above, pressurized gas is fed into the pipe from the gas supply means to move the impregnated body from one end opening side of the gas pipe to the other end. In other words, it is fed under pressure to the gas main pipe side. At this time, if the impregnated body is impregnated with a lining agent in advance, it will be possible to block gas even if the impregnated body has open cells.
When the impregnated body is pushed into the gas main pipe side by gas pressure, the gas from the gas supply means can be prevented from escaping to the gas main pipe side. When the impregnated body reaches the other end of the gas pipe, the liquid feeding tube is pulled and the impregnated body is returned to the opening side, while the lining agent is fed to the impregnated body by the lining agent supply mechanism. Apply it to the inside of the tube. At this time as well, the gas inside the gas pipe can be reliably shut off by the impregnated body impregnated with the lining agent.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a gas supply pipe as an example of a pipe that requires repair, and an opening 1a at one end of the gas supply pipe 1 is connected to a gas meter at a demand end such as a building. In addition, gas supply pipe 1
The other end opening 1b is connected to a branch pipe 2a of a low-pressure main pipe 2 of gas such as city gas. 3 is a lining device used when repairing the gas supply pipe 1, and this lining device 3 will be explained below.

That is, 4 is a lining agent-impregnated body inserted into the gas supply pipe 1. This impregnated body 4
is made of an elastic, open-celled material such as sponge, and has an outer diameter slightly larger than the inner diameter of the tube 1. One end of a liquid feeding tube 5 is connected to the impregnated body 4. This liquid feeding tube 5 is provided with sufficient tensile strength since it is also used as a pulling member. Further, as shown in FIG. 3, the tip of the liquid feeding tube 5, that is, the outlet of the lining agent, communicates with the interior of the impregnated body 4 through a large number of through holes 6.

Pressing plates 7 and 8 are provided at both ends of the impregnated body 4 to sandwich the impregnated body 4 therebetween. As shown in the figure, the holding plates 7 and 8 have a shape that widens in the radial direction of the lining agent-impregnated body 4, that is, toward the inner wall of the gas supply pipe 1.

A lining agent supply mechanism 10 is connected to the liquid feeding tube 5 so that a lining agent 11 such as epoxy resin or urethane resin can be fed to the liquid feeding tube 5 under pressure. Furthermore, a gas supply means (not shown) capable of feeding gas at a higher pressure than the gas flowing through the gas main pipe 2 is connected to the opening 1a side of the pipe 1.

Gas supply pipe 1 using the above lining device 3
To repair or reinforce gas supply pipe 1, first
Remove the opening 1a at one end of the meter, that is, the opening 1a of the meter on the building side. Then, the impregnated body 4 is inserted into the opening 1a.

Next, pressurized gas is forced into the pipe 1 from the opening 1a side, and the impregnated body 4 is forced into the gas low-pressure main pipe 2 by the pressure. This pressurized gas has the same composition as the demand gas such as city gas flowing through the gas low-pressure main pipe 2, and is fed into the pipe 1 at a pressure higher than the internal pressure of the gas low-pressure main pipe 2. Note that the impregnated body 4 is impregnated with the lining agent 11 in advance. By doing so, the impregnated body 4 can prevent the pressurized gas fed into the pipe 1 by the gas supply means from escaping to the gas main pipe 2 side, and also prevent the pressurized gas from escaping into the gas main pipe 2 side. Since friction is reduced, the impregnated body 4 can be easily inserted.

As shown in FIG. 2, the impregnated body 4 is
When the impregnated body 4 reaches the branch pipe part 2a and exits to the gas low-pressure main pipe 2 side, the pressure inside the pipe 1 decreases, so it can be known that the impregnated body 4 has reached the main pipe 2.

Next, pull the liquid feeding tube 5 a little to return the impregnated body 4 to the inside of the tube 1, and use the elastic force of the impregnated body 4 to
shut off the inside of. This prevents the demand gas flowing in the main pipe 2 from flowing into the pipe 1 side.

Then, the lining agent supply mechanism 10 is activated,
The lining agent 11 is pumped into the liquid feeding tube 5 and oozes out from the through hole 6 to impregnate the impregnated body 4 with the lining agent 11. The impregnated body 4 has a substantially spherical shape, and its both ends are held down to a certain extent from the center by the holding plates 7 and 8, so that the liquid feeding tube is moved as shown by the arrow in FIG. The lining agent 11 seeped out from the impregnated body 4 fills the impregnated body 4 while gathering densely, especially on the outer peripheral side of the impregnated body 4. Therefore, even if an open-cell sponge is used as the impregnated body 4, the gas flowing from the gas main pipe 2 side is prevented by the lining agent 11 densely impregnated into the impregnated body 4 and the presser plates 7, 8. can be effectively blocked.

When the impregnated body 4 is moved by pulling the liquid feeding tube 5 toward the opening 1a as described above, the lining agent 11 oozes out from the impregnated body 4 and is applied to the inner surface of the tube 1, forming a lining film 11a. . Then, by curing after a predetermined period of time, it is fixed as a lining layer.

According to the lining device 3, the lining film 11a can be formed from the inside of the pipe without digging up an existing pipe such as a buried gas supply pipe or removing the pipe installed in a building, etc., and can repair the pipe. Reinforcement can be done. In other words, in the past, the area requiring repair was cut over a predetermined range and replaced with a new pipe, which made the work large-scale and took a long time, but according to the above-mentioned lining device 3, the pipe can be replaced. Since existing pipes can be repaired from the inside without any trouble, even complicated pipes can be easily repaired with simple operations.

Then, while feeding the lining agent 11 to the impregnated body 4 through the liquid feeding tube 5, the impregnated body 4 is moved so that the lining agent oozes out from the impregnated body 4 and is applied to the inner surface of the tube. The holding plates 7 and 8 can prevent deformation of the impregnated body 4 when applying the lining agent.
It is easy to form a coating film of uniform thickness on the inner surface of the tube, and the amount of lining agent used can be reduced.

Furthermore, since the inside of the pipe 1 can be shut off by the impregnated body 4 during lining work, the gas flowing inside the gas low-pressure main pipe 2 can be prevented from leaking to the outside through the gas supply pipe 1.

In addition, since the liquid feeding tube 5 also serves as a pulling member for pulling the impregnated body 4, the structure is simple, and the number of members inserted into the tube 1 is reduced.
It is also possible to prevent these members from intertwining inside.

[Effects of the Invention] As described above, according to the present invention, a buried gas pipe or an existing pipe installed in a building, etc. can be left in place without digging up or removing it, and can be easily operated from the open end of the pipe. Lining can be done in a relatively short time. In addition, the impregnated body impregnated with lining agent allows lining work to proceed while reliably blocking the inside of the pipe, so when repairing gas supply pipes branching from the main gas pipe, etc., the main Even if repairs are performed while gas is still flowing, gas can be prevented from leaking to the outside.
That is, the inner surface of the gas supply pipe can be lined safely and quickly without causing any inconvenience to other gas consumers. Furthermore, even with a small amount of lining agent used, it is possible to uniformly apply a lining film to the inner surface of the pipe, and the lining agent can be reliably supplied to cracks, pinholes, joints, etc. of the pipe.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIGS. 1 and 2 are cross-sectional views showing different operating states of the lining device, and FIG. 3 is a cross-sectional view of a portion of the impregnated body. DESCRIPTION OF SYMBOLS 1...Pipe, 3...Lining device, 4...Lining agent impregnated body, 5...Liquid feeding tube, 7, 8...
... Pressing plate, 10 ... Lining agent supply mechanism, 11
...Lining agent.

Claims (1)

[Claims] 1. A substantially spherical sponge-like lining agent-impregnated body that is inserted into the gas pipe to be lined from the open end of the gas pipe, has elasticity, and has an outer diameter larger than the inner diameter of the gas pipe; A pair of presser plates are provided at both ends of the lining agent-impregnated body, sandwiching the impregnated body from both sides and extending in the radial direction of the impregnated body. a liquid feeding tube fixed to the body, having the presser plate fixed to the end thereof, and having a through hole in the end for causing the lining agent to seep into the impregnated body; and the liquid feeding tube. a lining agent supply mechanism that is connected to the other end and supplies a lining agent to the impregnated body from the opening side of one end of the gas pipe via a liquid feeding tube; A pipe lining device comprising: gas supply means for feeding gas into the gas pipe from one open end of the gas pipe toward the impregnated body at a pressure higher than the internal pressure of the gas pipe.