JPS6151952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a pipe lining device for repairing, reinforcing, etc. the pipe by lining the inner surface of the pipe such as a gas pipe.

(2) Conventional technology and its problems For example, when a leak occurs in a supply pipe that supplies gas from a city gas main to a gas demand side such as a building and repairs are necessary, conventionally, the leakage point is dug up and repaired. This is a large-scale work as the pipes have to be replaced, and the work requires a long time and a great deal of money. Moreover, even during repair work, the gas in the gas main pipe cannot be stopped, so repair work on gas supply pipes is extremely difficult work and requires a great deal of labor. Therefore, in order to simplify the repair work, there is a method in which a lining agent is injected into the inside of the pipe and adheres to the inner surface of the pipe, forming a lining layer that can be used to repair leak points and repair the inner surface of the pipe. However, in this case, it would be necessary to apply the lining agent not only to the inside of the tube but also to the inner surface of the tube, and the lining agent would accumulate at the bottom of the tube, narrowing the cross-sectional area of the tube's flow path. To prevent lining agent from being wasted,
There are problems such as the need to remove excess lining agent that has accumulated inside the pipe.

(3) Purpose of the Invention The present invention was made based on the above circumstances, and its purpose is to enable pipe repair and reinforcement work to be carried out from the inner surface of the pipe with simple operations, and to repair and strengthen the pipe from the bottom of the pipe, etc. It is an object of the present invention to provide a pipe lining device that can save the lining agent without narrowing the cross-sectional area of the flow path of the pipe by recovering the lining agent accumulated in the pipe.

(4) Structure of the Invention In other words, the present invention comprises: an elastic hollow body that can be expanded and contracted to be inserted into the inside of a pipe to be lined; an air supply/exhaust tube connected at one end to the elastic hollow body;
A pressurized gas supply mechanism connected to the other end of the supply/exhaust tube, a lining agent feeding passageway having a lining agent inlet/outlet near the elastic hollow body and provided along the supply/exhaust tube, and the lining agent. and a lining agent supply/suction mechanism connected to the lining agent feeding passage, which supplies the lining agent to the inside of the pipe through the lining agent feeding passage, sucks in and collects excess lining agent, and moves the elastic hollow body. This is a pipe lining device that allows a lining agent to be applied to the inner surface of the pipe using the outer surface of an elastic hollow body.

(5) Embodiment of the Invention An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. 1 in the figure is a gas supply pipe as an example of a pipe that requires repair, and this gas supply pipe 1
One end side opening 1a is connected to a gas meter at a demand end such as a building. Further, the other end opening 1b of the gas supply pipe 1 is connected to a gas main pipe 2 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 an elastic hollow body inserted into the interior of the gas supply pipe 1. This elastic hollow body 4 is
It is made of an elastic material such as rubber, and is airtight so that air can be trapped inside. Further, this elastic hollow body 4 has a substantially spindle shape that is elongated in the axial direction of the tube 1. Further, one end of a supply/exhaust tube 5 is connected to the elastic hollow body 4. This supply/exhaust tube 5 communicates with the inside of the elastic hollow body 4 . Further, since the supply/exhaust tube 5 is also used as a traction member, it has sufficient tensile strength. In addition, the above-mentioned supply and exhaust tube 5
A pressure gas supply mechanism 6 is connected to the other end. This pressure gas supply mechanism 6 is configured to include a pressure gas source, an on-off valve, and the like so that pressurized gas such as compressed air can be sent to the supply/exhaust tube 5 .

Further, a lining agent feeding passage 8 is provided parallel to the above-mentioned feeding/exhausting tube 5. This lining agent feeding passage 8 has a lining agent inlet/outlet 9 at its tip, and this inlet/outlet 9 is arranged near the elastic hollow body 4 . The lining agent feeding passage 8 may be a separate tube from the feeding/exhausting tube 5 as shown in the figure, but it may also be molded integrally with the feeding/exhausting tube 5.

A lining agent supply/suction mechanism 10 is connected to the lining agent feeding passage 8. This lining agent supply/suction mechanism 10 has a function of force-feeding the lining agent 11 to the feeding passage 8, and also has a suction function. Various forms of the lining agent 11 can be used, but as an example, epoxy resin or urethane resin putty-like, or foamed material mixed with a foaming agent is used.

In order to repair or reinforce the gas supply pipe 1 using the lining device 3, first, the opening 1a at one end of the gas supply pipe 1, that is, the opening 1a of the meter on the building side is removed. Then, the elastic hollow body 4 is inserted into the tube 1 through the opening 1a. Then, pressurized gas is sealed in the elastic hollow body 4 at a pressure higher than the demand gas in the gas main pipe 2.

Next, pressurized gas is forced into the pipe 1 from the opening 1a side, and the elastic hollow body 4 is forced towards the gas main pipe 2 by the pressure. This pressurized gas is
A gas having the same composition as the demand gas such as city gas flowing through the gas main pipe 2 is used, and is fed into the pipe 1 at a pressure higher than the internal pressure of the gas main pipe 2.

Then, as shown in FIG. 2, when the elastic hollow body 4 reaches the gas main pipe 2 and exits to the gas main pipe 2 side, the elastic hollow body 4 expands and the pressure inside the elastic hollow body 4 decreases. It can be known that the gas main pipe 2 has been reached. Note that since the elastic hollow body 4 has a substantially spindle-shaped elongated shape, when it reaches the gas main pipe 2 as shown in FIG.
can be secured. Therefore, the flow of gas flowing through the gas main pipe 2 is not interrupted.

Next, the elastic hollow body 4 is returned to the inside of the tube 1 by pulling the supply/exhaust tube 5 a little, and by blocking the inside of the tube 1 with the elastic hollow body 4, the gas flowing inside the gas main pipe 2 is removed from the tube 1. Make sure it doesn't flow to the side.

Then, the lining agent supply/suction mechanism 10 is operated to forcefully feed the lining agent into the feed passage 8, fill it into the pipe 1 through the lining agent inlet/outlet 9, and leave it for a while. Thereafter, when the elastic hollow body 4 is moved by gradually pulling the supply/exhaust tube 5, the lining agent 11 inside the tube 1 is uniformly applied to the inner surface of the tube 1 by the outer peripheral surface of the elastic hollow body 4. A lining layer 13 is formed. Further, while moving the elastic hollow body 4, excess lining agent is sucked in through the lining agent inlet/outlet 9 and collected.

According to the lining device 3, the lining layer 13 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 or the like. can be reinforced and repaired. In other words, in the past, the parts that required repair were cut and replaced with new pipes, which made the work large-scale and took a long time, but with the above-mentioned lining device 3, the existing pipes can be replaced without replacing the pipes. Since the pipe can be repaired from the inside as it is, even complicated pipes can be easily repaired with simple operations.

Since the lining agent remaining at the bottom of the pipe 1 can also be sucked in and collected through the lining agent inlet/outlet 9, it is possible to prevent the lining agent from remaining at the bottom of the Fushikoshi piping, for example. Therefore, the flow path cross-sectional area of the pipe does not become narrow, and the lining agent can be recovered, which is economical. Further, since the elastic hollow body 4 has a substantially spindle-shaped streamlined shape, there is an advantage that it can smoothly reciprocate inside the tube 1.

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

In addition, since the supply/exhaust tube 5 also serves as a pulling member for pulling the elastic hollow body 4, the structure is simple, and the number of members inserted into the tube 1 is reduced. will no longer be intertwined.

Furthermore, since the elastic hollow body 4 can be freely expanded and contracted, the elastic contact force against the inner surface of the tube 1 can be adjusted, and the outer diameter of the elastic hollow body 4 can be freely changed inside the tube 1.

Although the elastic hollow body 4 having a substantially spindle shape is used in the above-mentioned embodiment, the present invention can achieve the intended purpose even if a spherical elastic hollow body 4 as shown as a modified example in FIG. 4 is used. can be achieved.

Further, in each of the embodiments described above, the supply/exhaust tube 5 also serves as a pulling member for pulling the elastic hollow body 4, but for example, a pulling member such as a wire rope may be provided separately from the supply/exhaust tube 5. good.

(6) Effects of the Invention As described above, the present invention applies a lining agent to the inner surface of the tube by means of an elastic hollow body that is inserted into the tube and can be expanded and contracted, and moves integrally with the elastic hollow body. The lining agent is supplied to the inside of the pipe through a lining agent feed passage equipped with a lining agent inlet and outlet, and excess lining agent can be sucked and collected. Therefore, not only can the lining agent be applied to the inner surface of the tube using the elastic hollow body, but also the lining agent accumulated at the bottom of the tube can be collected, so that the cross-sectional area of the flow path does not become narrow. The lining agent is not wasted and is economical.

In addition, lining work can be carried out with the inside of the pipe blocked off by the elastic hollow body, so for example when repairing a gas supply pipe connected to a gas main etc., repairs can be carried out while the gas is flowing. This has the effect of preventing gas from escaping to the outside even during work.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, FIG. 1 is a sectional view schematically showing the lining device, FIGS. 2 and 3 are schematic sectional views in different operating states, and FIG. 4 is a sectional view schematically showing the lining device. FIG. 3 is a sectional view showing a modified example of the elastic hollow body. DESCRIPTION OF SYMBOLS 1... Pipe, 3... Lining device, 4... Elastic hollow body, 5... Supply/exhaust tube, 6... Pressure gas supply mechanism, 8... Lining agent feeding passage, 9... Lining agent inlet/outlet, 10... Lining agent supply suction mechanism, 1
1...Lining agent.

Claims (1)

[Claims] 1. An elastic hollow body that can be expanded and contracted to be inserted into the inside of the pipe to be lined, an air supply/exhaust tube connected at one end to the elastic hollow body, and connected to the other end of the air supply/exhaust tube. a lining agent feeding passage having a lining agent inlet/outlet in the vicinity of the elastic hollow body and provided along the feeding/exhausting tube, and a lining agent supply/suction mechanism connected to the lining agent feeding passage. A pipe lining device comprising: 2. The tube lining device according to claim 1, wherein the elastic hollow body has a substantially spindle shape that is elongated in the axial direction of the tube.