JPS58208014A - Coating method of inner surface of buried pipe - Google Patents

Abstract

PURPOSE:To reduce the time required for coating by a method in which the coating material with a long hollow flat shape is prepared in a buried main pipe, and into the internal part of said coating material, a sealed pipe is expanded with being turned over, and consequently the coating material with the flat shape is expanded and coats the inner surface of the main pipe. CONSTITUTION:L shape-introducing pipe 5 is connected to the lower part of a reversing device 3 equipped at ground on the branch pipe 2 connected to a main pipe 1 buried in the ground. Next, one end of a long hollow sealed pipe 6 is connected to the curved part of the introducing pipe 5 by a band 7. The main part of said sealed pipe is turned over internally and is rolled on a roller 9 in flat shape through the introducing pipe 5 by way of a guide roller 8. Then coating material 10 is prepared at the bottom of the main pipe 1, and the rear end of the coating material is fixed onto the surface of the sealed pipe 6 fastened to the curved part 5a by a band 10a. When compressed air is supplied from the air pipe 4 of the reversing device 3, the sealed pipe 6 is expanded with being turned over and expands the coating material 10, thereby causing said material 10 to be closely in contact with the inner surface of the main pipe 1.

Description

[Detailed description of the invention] The present invention relates to a method of coating the inner surface of a buried pipe.

Repair of leakage at the joints of buried pipes such as iron or concrete buried underground 1; or corrosion prevention of the inner surface of buried pipes 1
1. Therefore, the inner surface of the buried pipe is coated with fast-setting mortar or synthetic resin, and many coating methods are known. For example, in a method of coating the inner surface of one passage using a tube made of a flammable resin-absorbing material impregnated with a curable resin and surrounded by a fluid-impermeable membrane, the flammable tube When supplying the film in the form of a flat strip, the #3T sinterable tube and the film are supplied in the form of a flat strip.
By forcing the inside of said passageway along the passageway by means of a fluid pressure differential, the limb and membrane are everted and advanced within said passageway, so that the everted tubular portion becomes rTil.
There is a known method (see Japanese Patent Publication No. 55-41890) in which the curable resin is hardened so as to have the same shape as the passage wall while being pressed against the inner wall of the Til urine fluid pressure passage.

However, in the above-mentioned known method, curing 1! F
The outer surface of the tube is made of a flammable resin-absorbing material impregnated with a resin liquid and is surrounded by a tubular impermeable tF membrane, which makes the sheathing operation difficult. Because it is impregnated with liquid, there is a lot of resistance when turning it over inside the passage, which requires a large fluid pressure differential, and it takes a long time to press it against the inner wall of the passage. . In order to turn over the flexible tube and membrane, a low-temperature fluid is blown into the flammable tube as fluid pressure, and after the flammable tube is pressed against the inner wall of the passage, the resin is cured. Since hot air is blown in, the curing of the resin may be delayed.

The present invention has been achieved with the aim of solving the problems of the above-mentioned known coating methods.

That is, in this invention, a guide pipe provided at the lower part of the inverter is arranged in a voice manhole connected to a buried main pipe, and 11. The other end of the hollow sealing device, which is wound inside out inside the inverter, is fixed to the bent part formed by A, and one end of the covering material impregnated with a hardening agent and placed inside the buried main pipe is fixed. By fixing the tube and inflating the sealed tube with fluid pressure supplied to the inverter, the drying sheathing material is expanded and 1. This is a method for coating the inner surface of a buried pipe, which is characterized by coating the inner surface of a buried pipe.

1''J, embodiments of the invention will be described below with reference to the drawings.

1 is a buried main pipe buried almost horizontally underground, and 2 is a buried branch pipe connected to the buried main pipe 1 from above ground to form a manhole. Reference numeral 3 denotes an inverter disposed on the ground above the buried branch pipe 2, and an air pipe 4 is installed at the top of the inverter 3, and a guide pipe 5 inserted into the buried branch pipe 2 is installed at the bottom of the inverter 3. The lower part of the guide tube 5 is bent into a figure 5 shape,
The outer diameter of the bent portion 5a is slightly smaller than the inner diameter of the buried main pipe l. The bent portion 5a of the guide tube 5 has a positive
One end of a long hollow sealed tube 6 made of a tick film is fixed by a band 7, and the main part of the sealed tube 6 is turned inward and passes through the guide tube 5 in a flat shape, and is inserted into the inverter 3. The film is wound around a take-up roller 9 via a guide roller 8 provided at the winding roller 9.

- The long hollow sheathing material 10 made of felt or the like impregnated with a thermosetting resin liquid has an outer diameter such that when the sheathing material 10 is inflated, its outer surface is in close contact with the inner surface of the buried main pipe 1. have. The covering material 10 is placed at the bottom of the buried main pipe 1 in the form of a band by being pulled from another buried branch pipe 2 to the ground by a rope ll' attached to its front end, and the guide pipe 5 is inserted into the buried branch pipe 2. After that, the rear end of the covering material 10 is fixed with a band 10a to the upper surface of the end of the sealed tube 6, which is fixed to the outer surface of the bent portion 5a of the guide tube 5. Next, when compressed air is supplied from the air pipe 4 of the inverter 3 to the inverter 3, the sealed tube 6 is turned over and expanded to inflate the covering material 10, and this expanded end is shown in FIG. As it is moved from the rear end to the front end as shown by arrow A, the covering material 10 is expanded and brought into close contact with the inner surface of the buried main pipe 1.

At this time, if you heat the compressed air as necessary,
As the covering material 10 is expanded, the thermosetting resin is hardened and brought into close contact with the circular surface of the buried main pipe. Covering material lO force: After being tightly attached to the inner surface of the buried main pipe 1, 6 yen of compressed air from the sealed pipe is released from the air pipe 4, and a drawn-out rope (not shown) is wrapped around the front end of the sealed pipe 6. By winding it up on the take-up roller 9, the sealed tube 6 is rewound onto the take-up roller 9 in an inverted flat shape.

The sealed tube used in this invention is preferably made of plastic film such as polyethylene or polypropylene, or rubber. Further, the hardening agent can be hardened in several minutes, and quick-setting mortar or the like can be used in addition to thermosetting resin.

Furthermore, to inflate the sealed tube, an inert gas such as nitrogen or carbon dioxide, or a liquid such as water may be used instead of air.

According to this invention, the operation of impregnating the covering material with a hardening agent is easy, and the covering material is placed in a long length inside the buried main pipe in advance, and the covering material is sealed inside and expanded while being turned inside out. Since the material is expanded, the pressure required to expand the sealed tube is small;
Moreover, the time required for covering the buried main pipe with the covering material is shortened.

[Brief explanation of the drawing]

Figure 1 is a cutaway side view for explaining this invention;
The figure is a cutaway side view of the main part of FIG. 1. 1: Buried main pipe, 2: Manho)v (buried branch pipe), 3:
Anti-soap device, 5: Guiding tube, 5a: Bent part, 6: Sealed tube, lO
: Covering material.

Claims (1)

[Claims] [l] An inverted pipe in a manhole connected to a buried main pipe;
installed at the bottom. A guide tube is arranged, and 11' is placed at the bottom of the guide tube.
2 h%: The other end of the hollow sealing device, which is wound inside out inside the inverter, is fixed to the bent part, and the covering material is impregnated with a hardening agent and placed inside the buried main pipe. A coating for the inner surface of a buried pipe, characterized in that by fixing one end and inflating the sealed tube with fluid pressure supplied to the inverter, the coating material described in "2" is expanded and tightly coats the inner surface of the buried main pipe. Method.