JPH04341822A - Pipe line repairing technique and pipe lining structure - Google Patents

Abstract

PURPOSE:To satisfy a plurality of characteristics to be required for a lining at the same time. CONSTITUTION:A separate tubular lining material (open liner) 8 impregnated with curing resin is reversed and inserted into a tubular lining material 3 impregnated with curing resin different in kind from the curing resin, while pressing both the tubular lining materials 3, 8 against an inner circumferential surface of a worn pipe 1 by fluid pressure, the curing resin infiltrated into those lining materials are cured, through which the inner circumferential surface of the worn pipe 1 is lined with a rigid lining pipe having an inner and outer cylindrical structure. Therefore, for example, an outside rigid lining pipe is made into one having high pressure resistance and an inside rigid lining pipe can be made into one having high corrosion resistance and it becomes possible that plurality of characteristics to be required for a lining can be satisfied at the same time.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a pipe repair method for repairing an old pipe by lining the inner peripheral surface of the pipe with a rigid lining pipe, and a pipe lining structure formed by the pipe repair method. Regarding.

0002

[Prior Art] When a conduit such as a sewer pipe buried underground becomes obsolete, the conduit is repaired by lining the inner peripheral surface of the conduit without digging it out. Repair methods have already been proposed and put into practical use (see, for example, Japanese Patent Laid-Open No. 60-242038). That is, this pipe repair method involves, for example, inserting a flexible tubular lining material impregnated with a thermosetting resin into an old pipe while inverting it using water pressure, pressing it against the inner peripheral surface of the old pipe, and then inserting the flexible tubular lining material into the old pipe. The water that fills the pipe is heated with steam, etc. to make it hot water, and the heat of this hot water hardens the thermosetting resin impregnated into the tubular lining, forming a rigid lined pipe around the inner circumference of the old pipe. This is a construction method that applies lining.

0003

[Problems to be Solved by the Invention] However, according to the above-mentioned conventional construction method, only one type of hardening resin is used to harden the tubular lining material to obtain a rigid lined pipe. When it is necessary to apply a high-quality lining, it is necessary to use an expensive hardening resin such as vinyl ester resin with high corrosion resistance, and there is a problem in that it costs a lot of money to repair large-diameter or long old pipes. be. Furthermore, if emphasis is placed on corrosion resistance, there is also the problem that sufficient strength cannot be obtained.

The present invention has been made in view of the above problems, and its purpose is to provide a pipe repair method and a pipe lining structure that can simultaneously satisfy multiple characteristics required of the lining. It is in.

[0005]

[Means for Solving the Problems] In order to achieve the above object, in the method of the present invention, a tubular lining material impregnated with a curable resin is inserted into an old pipe, or a curable resin is added to a tubular lining material inserted into an aged pipe. Another tubular lining material impregnated with a different type of curable resin is reversely inserted into the tubular lining material, and both tubular lining materials are impregnated while being pressed against the inner peripheral surface of the aged pipe using fluid pressure. The cured resin is cured.

The present invention is also characterized in that the pipe lining structure is constructed by forming a rigid lining pipe with an inner and outer double cylindrical structure containing different types of curable resins on the inner peripheral surface of the aged pipe.

[0007]

[Function] According to the present invention, the inner circumferential surface of an old pipe is lined with a double inner and outer rigid lining pipe containing different types of hardening resins, so the outer side (pipe wall side) is lined with high-strength and inexpensive polyester, for example. By lining the tube with a rigid lining tube containing resin and lining the inside with a rigid lining tube containing vinyl ester resin, which has high corrosion resistance, a lining with excellent pressure resistance and corrosion resistance can be obtained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 4 are cross-sectional views showing the construction method of the present invention in the order of its steps, and FIG. 5 is an enlarged cross-sectional view taken along the line A--A in FIG. 4.

In the figure, 1 is an old pipe such as a sewer pipe buried underground, and as shown in FIG.
A cylindrical flexible traction liner 2 is reversely inserted into the interior in the direction of the arrow shown in the figure by pneumatic pressure, whereby the first tubular lining material 3 connected to the end of the traction liner 2 is drawn into the aged pipe 1. It will be done.

Next, as shown in FIG. 2, while the tubular lining material 3 drawn into the aged pipe 1 is evacuated by the vacuum pump 4, a material with high pressure resistance and low cost is placed inside the tubular lining material 3. A thermosetting resin 5 made of polyester resin is injected through a resin hose 6. Note that one end of the tubular lining material 3 (the side opposite to the side where the resin 5 is injected) is closed by a stopper 7.

Thereafter, as shown in FIG. 3, an open liner 8, which is a second tubular lining material, is inverted and inserted into the interior of the tubular lining material 3 using air pressure. The open liner 8 is pre-impregnated with a vinyl ester resin which is a thermosetting resin different from the curable resin 5 and has excellent corrosion resistance.

[0013] When the open liner 8 is reversely inserted into the tubular lining material 3 while the inside of the tubular lining material 3 is evacuated by the vacuum pump 4, the thermosetting resin 5 inside the tubular lining material 3 moves forward. (Right side of Figure 3)
The tubular lining material 3 is impregnated while being sent to the tubular lining material 3.

When all the thermosetting resin 5 is impregnated into the tubular lining material 3, the open ends of the tubular lining material 3 and the open liner 8 are aligned with the outer periphery of the opening of the pressure vessel 9, as shown in FIG. can be attached to.

By the way, an air compressor 10 is connected to the pressure vessel 9, and a hot water hose 12 extending from a boiler 11 installed on the ground is drawn into the pressure vessel 9. The hot water hose 12 passes through the open liner 8 and is connected to the tip of the open liner 8 (the right end in FIG. 4). A plurality of spout ports (not shown) from which hot water is to be spouted are formed at appropriate intervals in a portion of the hot water hose 12 facing into the open liner 8.

A hot water hose 14 is connected to a drain pipe 13 attached to the lower part of the pressure vessel 9.
The hot water hose 14 is connected to the boiler 11 via a hot water pump 15.

When the air compressor 10 is driven to supply air at a predetermined pressure into the pressure vessel 9, the tubular lining material 3 and open liner 8 connected to the pressure vessel 9 are expanded by the air pressure. , is pressed against the inner peripheral surface of the aged pipe 1 as shown in the figure.

Next, when the boiler 11 and hot water pump 15 are driven while maintaining the above state, the boiler 11
The hot water heated to a predetermined temperature by the hot water hose 12
The water flows in the direction of the arrow shown in the figure and is ejected from the spout formed in the hot water hose 12. Then, the pipe lining material 3 and the open liner 8 are showered with hot water from inside, and the different thermosetting resins impregnated in them are heated and hardened by the hot water, and the inner periphery of the aged pipe 1 becomes as shown in FIG.
As shown in FIG. 3, the tubes are lined with rigid lining tubes 8A and 3A having a double inner and outer cylindrical structure formed by curing different types of thermosetting resins. That is, the aging pipe 1 is lined with a rigid lined pipe 3A having high pressure resistance (hardened tubular lining material 3 impregnated with polyester resin having high pressure resistance) on the side closer to the inner peripheral wall surface, and on the inside thereof with a corrosion-resistant lined pipe 3A. Highly rigid lined pipe (cured with open liner 8 impregnated with highly corrosion-resistant vinyl ester resin)
Since it is lined with 8A, compressive strength and corrosion resistance are increased at the same time.

In the above embodiment, after the tubular lining material 3 is drawn into the aged pipe 1, the tubular lining material 3 is
Although the tubular lining material 3 is impregnated with the thermosetting resin, the tubular lining material 3 may be impregnated with the thermosetting resin in advance. Further, if the open liner 8 is impregnated with, for example, an epoxy resin having high alkali resistance, a lining with high compressive strength and high alkali resistance can be obtained. Furthermore, as the curable resin, a photocurable resin can also be used in addition to a thermosetting resin.

[0020]

As is clear from the above description, according to the present invention, a tubular lining material impregnated with a curable resin is inserted into an old pipe, or a curable resin is applied to a tubular lining material inserted into an aged pipe. Another tubular lining material impregnated with a different type of curable resin is reversely inserted into the tubular lining material, and both tubular lining materials are impregnated while being pressed against the inner peripheral surface of the aged pipe with fluid pressure. The inner circumferential surface of the old pipe was lined with a dual inner and outer rigid lining pipe containing different types of hardenable resin, which had the effect of simultaneously satisfying multiple properties required for lining. is obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the construction method of the present invention in the order of its steps.

FIG. 2 is a sectional view showing the construction method of the present invention in the order of its steps.

FIG. 3 is a cross-sectional view showing the construction method of the present invention in the order of its steps.

FIG. 4 is a cross-sectional view showing the construction method of the present invention in the order of its steps.

FIG. 5 is an enlarged sectional view taken along line A-A in FIG. 4;

[Explanation of symbols]

1　　　　　　　　Old pipes 3 Tubular lining material 5 Thermosetting resin

Claims (3)

[Claims] Claim 1: A tubular lining material impregnated with a curable resin is inserted into an old pipe, or a tubular lining material inserted into an aged pipe is impregnated with a curable resin, and a different type of hardened material is inserted into the interior of the tubular lining material. A pipe line characterized in that another tubular lining material impregnated with a curable resin is inverted and inserted, and while both tubular lining materials are pressed against the inner circumferential surface of the aged pipe with fluid pressure, the curable resin impregnated in them is cured. Repair method. [Claim 2] A pipe lining structure in which a rigid lining pipe with an inner and outer double cylindrical structure containing different types of curable resin is formed on the inner peripheral surface of an old pipe. 3. The curable resin contained in the outer rigid lining tube is a polyester resin, and the resin contained in the inner rigid lining tube is a vinyl ester resin or an epoxy resin. pipe lining structure.