JPH03178A - How to remove moisture in pipes - Google Patents

Abstract

PURPOSE:To perfectly execute the joining in a duct line by introducing a compositely formed tube provided with a water absorbing polymer layer into a duct line, thereafter applying inner pressure to expand it and removing water by absorption. CONSTITUTION:A tube 10 of which a water absorbing polymer layer 11 as an outer layer is compositely formed on a plastic layer 12 as an internal layer is introduced into a duct line 1 in such a manner that its sectional shape is changed to reduce the shape. Then, air is fed into the tube 10 and is expanded to closely brought a water absorbing polymer layer 11 in the tube 10 into contact with the internal face of the duct line. The tube 10 expands to the outside 10a and water 4 remaining in the part is absorbed away by the water absorbing polymer. In this way, remaining water can perfectly be removed, by which the lining of a hose can surely be executed.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a method for removing moisture remaining in pipes such as cast iron pipes, steel pipes, humid pipes, etc., which are installed for the transfer of fluids such as water and gas. It is related to.

(Prior art) Cast iron pipes installed to transfer fluids such as water and gas,
When pipes such as steel pipes and humid pipes are in disrepair, the inside of the pipes is cleaned up while buried in the ground or installed on racks at high places, and then plastic tubes or composites made of reinforcing fiber layers and plastics are used. A rehabilitation method is sometimes used in which a hose is drawn into a pipe or inserted by an inversion method, and the tubes are heated, expanded under pressure, and bonded to the inner surface of the pipe.

In the above-mentioned rehabilitation method, in order to reliably bond the plastic tube or composite hose to the inner surface of the pipe, cleaning inside the pipe to remove rust lumps, scale, limescale, etc. inside the pipe is performed using, for example, the scraper method or the ultra-high pressure jet water method. It is being done.

Therefore, the inside of the pipe after cleaning is flooded with water, and if this continues, the tube or hose cannot be adhered to the inner surface of the pipe in a good condition. For this reason, traditionally swatsuit
After that, dry the pipe by blowing room-temperature air or hot air into the pipe, and then remove water by passing a cylindrical sponge or holding a piece of cloth through the pipe. are doing.

In addition, residual moisture (water droplets, puddles) in the pipes is not only the water used for cleaning, but also the return water from the water distribution faucets that are distributed to each household and the water stop valves of the branch pipes. In sewage pipes and gas pipes, atmospheric pressure inside the pipes may cause underground water to infiltrate, and water removal including this is performed using the method described above.

(Problem to be solved) Conventionally, the removal of water during pipe cleaning to remove rust lumps, scale, limescale, etc. inside the pipes involved draining with a swatper, drying with air, and wiping with a sponge or rag. However, there were problems in that the moisture could not be completely removed and the lining of tubes and hoses could not be reliably bonded to the inner surface of the pipe.

In particular, as shown in Figure 2 (a), water (4) remaining in the gap (2) between the joint (3) between the pipe opening (pipe opening) and the pipe (1), Alternatively, water (4) remaining at the bottom of the pipe (1) at the bend and in the gap between the joints (3) cannot be removed and remains between the pipe and the lined tube or hose. This sometimes caused the hose to bulge.

In most cases, return water from water taps or branch pipes or underground water that enters the pipes can be dealt with by treating the water supply before lining the pipes, and water remaining in the gaps between pipe joints can be treated. The problem was that the water remaining at the bottom of the inclined pipe could not be removed sufficiently, and as mentioned above, the tube or hose could not be reliably bonded to the inner surface of the pipe.

(Means for Solving the Problems) The present invention solves the above-mentioned problems, and makes it possible to remove water remaining in the gaps between pipe joints, inclined pipes, or the bottom of pipes at bends. It provides a method for removing
The feature is that a composite molded tube with a water-absorbing polymer layer on the inner plastic layer is introduced into the pipe, and then internal pressure is applied to expand it, allowing the water-absorbing polymer to absorb and remove moisture from the pipe. be.

FIG. 1 is an explanatory diagram showing a vertical cross-section of a main part of a specific example of the method for removing water in a pipeline according to the present invention.

A tube (10), which was formed by composite molding of an outer layer of a water-absorbing polymer layer (1) on an inner plastic layer (12), was introduced into the conduit after its cross-sectional shape was changed to make it smaller. After that, air is sent into the tube (10) to inflate it, bringing the water-absorbing polymer layer (11) of the tube (10) into close contact with the inner surface of the pipe.

At this time, in the gap (2) of the joint of the tube (+), the tube (lO) bulges outward (10a), and the water (4) remaining in that area is absorbed and removed by the water-absorbing polymer. I can do it.

(Function) In order to reliably bond the plastic tube or composite hose to the inner surface of the pipe, cleaning is performed to remove rust lumps, scale, limescale, etc. from the pipe as in the past. After that, most of the water was drained using the traditional method using Swatspur.
Blow air to dry the inside of the pipe.

After that, a composite molded tube (10) as described above is formed.
is introduced into the pipe, and internal pressure is applied to bring it into close contact with the inner surface of the pipe. Due to the water absorption action of the water-absorbing polymer, not only the water (4) remaining in the gap between the pipe joints but also the water remaining over the entire length of the pipe is removed. remove.

(Effects of the Invention) As described above, according to the method for removing water in pipes of the present invention, it is possible to completely remove water remaining at the bottoms of gaps, slopes, bends, etc. of pipe joints, which have been particularly problematic in the past. becomes possible,
Plasti on the inner surface of the pipe 1. It is an extremely effective means for rehabilitating pipes, as it can reliably line the pipes and composite hoses.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a vertical cross section of a main part of a concrete example of the pipe-based moisture removal method of the present invention. FIGS. 2(a) and 2(b) are explanatory diagrams of problems with the conventional method. 1...Pipeline, 2...Gap 1.3...Joint, 4...
・Residual moisture, 10... Composite molded tube, 11...
Water-absorbing polymer layer, 12... plastic layer.

Claims (1)

[Claims] (1) A composite molded tube with a water-absorbing polymer layer on the inner plastic layer is introduced into the pipe, and then internal pressure is applied to expand it, and the water-absorbing polymer absorbs and removes the moisture in the pipe. A method for removing moisture in pipes.