JPH0459955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention involves placing a liquid lining material and a lining object into a pipe buried underground, and supplying pressurized fluid into the pipe to move the object to the above-mentioned level. The present invention relates to a method of force-feeding the lining material within a pipe, forcing the lining material away with the object, and applying the lining material to the inner surface of the pipe.

[Conventional technology]

Conventionally, the above method has been carried out by using a resin that takes a long time to harden, such as an epoxy resin that hardens by mixing two components, as the lining material, and using a normal temperature fluid such as air to pump the object. Therefore, high pressure for pumping objects is applied to the lining material applied to the inner surface of the pipe before it hardens to sufficient strength, so if there is a large hole in the pipe, the hole may become blocked. There was a risk that the lining material applied in the process would be torn by the high-pressure fluid blowing through, leaving the repair incomplete. Conventionally, a method has been proposed in which the pipe is filled with moisture-curable resin before the lining material is applied, and the resin that flows out from the hole into the earth and sand hardens the earth and sand near the hole.

[Problem that the invention seeks to solve]

However, the work efficiency is poor because it takes a long time to compact the soil, and the compaction strength of the soil is low, resulting in low reliability in preventing lining defects due to high-pressure fluid blow-through.

An object of the present invention is to reliably and efficiently prevent the lining material that closes the hole from being destroyed by the high-pressure fluid for pumping objects even if there is a large hole in the pipe. The point is to enable the work to be done.

[Means for solving problems]

The characteristic means of the present invention is that before the liquid lining material is applied to the inner surface of the pipe buried underground by an object pumped with pressurized fluid, the pipe is filled with low-temperature liquefied gas and discharged, Its effects are as follows.

[Effect]

In other words, if a hole exists in a pipe, the low-temperature liquefied gas that is filled with it will flow out from the hole into the ground, and the earth and sand located near the outside of the hole will be frozen rapidly and with sufficient solidification strength. Due to the action of frozen earth and sand, airtightness and pressure resistance against fluid leakage from the holes are sufficiently and reliably improved. Therefore, even if the object-pumping fluid acts at a considerably high pressure on the lining material applied to close the hole, it is possible to reliably prevent the lining material that closes the hole from being torn by the high-pressure fluid.

〔Effect of the invention〕

As a result, it has become possible to perform good lining processing in a highly reliable state without any adverse effects from the high-pressure fluid for pumping the object, and to perform the lining work quickly.

〔Example〕

Next, examples will be shown.

As shown in Fig. 1, on both ends of pipe 1, which is to be lined, among the conduits buried underground,
Excavate and cut the pipe 1, attach lids 4 and 5 to both ends of the pipe 1, attach a low temperature liquefied gas supply/discharge device 8 to one lid 4, and an exhaust riser pipe 9 with an on-off valve V to the other lid 5. is connected, the pump 8a of the supply/discharge device 8 is used to fill the tank 8b with low-temperature liquefied gas, such as liquefied nitrogen or liquefied air, and the exhaust riser pipe 9 is closed.
The low temperature liquefied gas in the pipe 1 is pressurized, and the low temperature liquefied gas is made to flow through the hole A of the pipe 1 into the earth and sand.
Freeze and solidify nearby soil B.

The low-temperature change gas in the pipe 1 is collected into the tank 8b by the pump 8a of the supply/discharge device 8, and the lids 4 and 5 are removed from the pipe 1. As shown in FIG.
A suitable amount of liquid lining material 2 and a lining object 3 of a suitable diameter commensurate with the pipe inner diameter and lining thickness are put into the pipe from one end side. The lining material 2 is made of a liquid resin that hardens at room temperature, such as an epoxy resin, or a resin that hardens at room temperature and softens when heated, such as polyethylene or vinyl chloride, which has been preheated to have appropriate fluidity. be.

As shown in FIG. 3, a lid 4 is attached to the pipe 1, and low-temperature pressurized gas is supplied into the pipe 1 from the blower 8c of the supply/discharge device 8, and the object 3 is fed under pressure within the pipe 1. 3, the lining material 2 is swept away and applied to the inner surface of the pipe, and the applied lining material 2 is hardened by the cooling action of the low-temperature gas to form a lining layer 7 on the entire inner surface of the pipe.

As shown in FIG. 4, after the lining process over the entire length of the pipe 1 has been completed, excess lining material 2 and objects 3 are collected from the pipe 1, and the blower 8c is stopped.
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 treatment, but may be of a two-component mixed type, a thermosetting type, a room temperature curing type, or has other characteristics. You can use the following.

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 inserted between the objects 3.

To force-feed the object 3, various gases and liquids at room temperature and low temperature can be used, and in short, it is sufficient to use an appropriate fluid at an appropriate temperature.

The target pipe 1 is generally a general conduit for city gas, natural gas, water supply, etc., but it may be any other buried pipe.

[Brief explanation of drawings]

1 to 4 are conceptual diagrams illustrating the procedure of the 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 put into a pipe 1 buried underground, and the object 3 is force-fed inside the pipe 1 by supplying pressurized fluid into the pipe 1. , a method in which the lining material 2 is swept away by the object 3 and applied to the inner surface of the pipe 1, and the method includes filling the pipe 1 with low-temperature liquefied gas and discharging it before applying the lining material 2. Method for lining the inner surface of pipes. 2. The method according to claim 1, wherein the lining material 2 is a resin that hardens at room temperature and softens when heated.