JPS61103586A - Method for lining inner surface of pipe - Google Patents

Abstract

PURPOSE:To line excellently by using a low-temp. fluid as a pressurized fluid for forcing a body for coating a liq. coating material on the inner surface of a pipe, and making the viscosity of a coated lining material high with the cooling action of the low-temp. fluid. CONSTITUTION:A liq. lining material 2 and a lining body 3 are brought into a pipe 1, and the body 3 is forced through the inside of the pipe. 1 by supplying a pressurized liq. into the pipe 1. The lining material 2 is carried away by the body 3, and coated on the inner surface of the pipe 1. In this case, a low- temp. fluid obtainable from a low-temp. liquefied gas is used, for example, as the pressurized gas for forcing said body, and the viscosity of the coated lining material 2 is made high by the cooling action of the low-temp. fluid. Consequently, even when a large hole is present in the pipe, the breakage of the lining material plugging the hole by a high-pressure liq. can be effectively prevented, and excellent lining can be carried out with high reliability.

Description

[Detailed description of the invention] [Industrial application field] The original F! A includes placing a liquid lining material and a lining object in a pipe, supplying pressurized fluid into the pipe to forcefully feed the object through the pipe, forcing the lining material away by the object, and removing the lining material from the pipe. Concerning the method of applying to the inner surface.

[Prior art 1] Conventionally, the above method has been carried out by using a resin that takes a long time to harden, such as a resin that hardens by mixing two components such as an epoxy resin, as a lining material, and using a normal temperature fluid such as air to pump the object. (for example, Japanese Patent Application Laid-Open No. 1983-54795)
Publication No.).

[Problem that the invention seeks to solve]

However, the high pressure for pumping the object acts on the lining material applied to the inner surface of the pipe before it hardens to sufficient strength. There was a risk that the lining material would be torn by the high-pressure fluid blowing through, leaving the repair incomplete, so there was room for further improvement.

An object of the present invention is to prevent the lining material that closes the hole from being ruptured by the high-pressure fluid for pumping objects even if the pipe has a large hole.

[Means to solve the problem]

The characteristic means of the present invention is to use a low-temperature fluid, such as one obtained by low-temperature liquefied gas, as a pressurized fluid for pumping an object for applying a liquid lining material to the inner surface of a pipe,
The purpose is to increase the viscosity of the applied lining material by the cooling action of the low-temperature fluid, and its effects are as follows.

[Function] In other words, the lining material applied to the pipe is rapidly cooled with a low-temperature fluid to immediately increase its viscosity, and the high viscosity state is maintained by contact with the low-temperature fluid when an object is being pumped.

Even if a pipe has a large hole, the lining material that closes the hole can be effectively prevented from being torn by high-pressure fluid.

〔Effect of the invention〕

As a result, it has become possible to perform a good lining process with high reliability without the adverse effects of the high-pressure fluid for pumping objects.

〔Example〕

Next, examples will be shown.

As shown in Figure 1, an appropriate amount of liquid lining material (
2), and insert a lining object (3) of an appropriate diameter commensurate with the inner diameter of the pipe and the lining thickness. The lining material (2) is a liquid resin that hardens at room temperature, such as an epoxy resin, or a resin 1 that hardens at room temperature and softens when heated, such as polyethylene or polyvinyl chloride, which is preheated to have appropriate fluidity. This is what I did.

As shown in Fig. 2, a lid (5) is attached to the pipe 11+, low temperature pressurized gas is supplied from the blower (6) into the pipe +1), and the object (3) is force-fed inside the pipe flll. , the lining material (2) is swept away by the object (3), and the applied lining material (2) is applied to the inner surface of the pipe.
is hardened by the cooling action of low-temperature gas to form a lining layer (7
) is formed on the entire inner surface of the pipe. The pressurized gas is a cryogenic gas obtained by vaporizing a low-temperature liquefied gas such as liquefied nitrogen or liquefied air in the cylinder (4).

As shown in FIG. 3, after the lining process has been completed over the entire length of the pipe fl), the excess lining material (2) and object (3) are collected from the pipe fl).
After stopping the blower (6), attach the lid (6) to the pipe (1).
Remove from.

[Another example]

Next, another embodiment will be described.

The lining material (2) is preferably any resin that hardens at room temperature and softens when heated, as it can quickly perform a good lining process, but may include two-component mixed type, thermosetting type, room temperature curing type, etc. Available with various characteristics.

The shape of the object (3) can be changed into a spherical shape, a cannonball shape, etc., and the material and structure of the object (3) can also be changed as appropriate. A lining material (2) may be placed between the objects (3).

Various low-temperature gases and low-temperature liquids can be used to pump the object (3), and in short, any suitable low-temperature fluid may be used at an appropriate temperature.

The target pipe (1) is for city gas, natural gas,
Existing conduits for water supply, etc. are common.

It may be a new tube.

[Brief explanation of drawings]

1 to 3 are conceptual diagrams illustrating the procedure of one method of the present invention. +1)...Pipe, (2)...Lining material, (3)...Object.

Claims (1)

[Claims] [1] A liquid lining material (2) and a lining object (3) are placed in a pipe (1), and the object (3) is filled by supplying pressurized fluid into the pipe (1). Said pipe (1)
the lining material (2) to the object (3).
In this method, a low temperature fluid is used as the pressurized fluid for pumping the object, and the applied lining material (2) is made to have a high viscosity by the cooling effect of the low temperature fluid. Lining method for the inner surface of pipes. [2] The lining material (2) is a resin that hardens at room temperature and softens when heated.
1].