JPS6015127A - Method of forming film on inner circumferential surface of pipe - Google Patents

Abstract

PURPOSE:To enable a film to be formed in a bent pipe section, by applying a vacuum sucking force to a turned section of a hoselike sheet which will form a film. CONSTITUTION:A part of a flexible hoselike sheet 2 the inside of which is coated with an adhesive is turned and is attached through a mouth fitting 3 to one end of a pipe 1 that is buried. Compressed air from an air compressor 7 is fed to act to the turned part of the sheet 2 so that the sheet 2 may be further turned. A vacuum valve body 8 that can be moved by a music wire is inserted into the pipe 1 with the vacuum valve body 8 connected to air hoses 9, 10, the space 12 between the outside of the turned part of the sheet 2 and the vacuum valve body is made vacuous through the air hose 9 so that a sucking force is applied and an excess of an adhesive 13 is discharged outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating forming method for effectively forming a coating on the inner peripheral surface of a buried pipe such as a gas pipe or a water pipe (hereinafter also referred to as a pipe).

Traditionally, countless pipes for supplying gas and water have been buried underground under roads, but in recent years, repeated tremors caused by overcrowded heavy vehicles have caused gas leaks, water bends, or broken pipes. Currently, managers are struggling to take countermeasures due to these accidents.

Also, as society has become more enlightened, laying new pipes for this repair also causes traffic problems due to road excavation.
As a solution to these problems, there is a method of forming a tough membrane on the inner surface of the pipe by inverting the inner surface of the hose-shaped sheet for film formation with adhesive applied, using the pressure of compressed air. It has been developed and is currently in practical use.

However, in order to avoid other buried parts, underground pipes are installed at an angle of 22°.
, 45°, and 90° bent pipes are used in various places, and the sheet that uses air pressure for inversion construction has the problem that it cannot be inverted because the resistance increases at the back of the bend.
Especially at the 90° part, it is almost impossible.

One possible solution to this problem is to make the sheet softer, but in the case of water pipes, etc., the sheet strength is 5 to 10 kq/cyA due to the high internal pressure, and in the case of gas, the sheet strength is 6 to 5 kg. /ryl, so a comfortable seat could not be used.

The object of the present invention is to use a vacuum pump to generate a solid wall state in contact with the inverted part (also called the folded part) of a hose-like sheet that forms a coating, and to bend the material by the combined force of the suction force and the air pressure inside the hose-like sheet. The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional art by providing a complete method for forming a ruptured membrane on the inner peripheral surface of a pipe, which makes it easy to form a membrane on the private parts.

Next, the configuration of an embodiment of the present invention will be explained with reference to the drawings.

Figure 1 is a basic N9 diagram of the construction method according to the Kiryo construction method, in which adhesive is applied inward to one end of the pipe 1 for processing the buried material bent at an arbitrary angle. The coated one-iJ bowl-shaped sheet 2 is folded back and attached via the cap U, 3, and the sheet 2 is placed in a reversing machine 5 connected to one end of the pipe 1 with a guide hose 4. The unwinding shaft B driven by the motor M is rotated υ, and compressed air is supplied to the rewinding machine 5 by the near compressor 7, which is adjusted to a predetermined pressure that can hold one sheet 2. A pressing force in the direction of folding the sheet 2 acts on the folded portion of the sheet 2 .

On the other hand, after leading a piano wire into the pipe 1 and passing the wire all the way through, the air hose 9, 10 connected, insert it into the pipe 1 from the other end of the pipe 1, and insert the terminal fitting 1 at the other end of the pipe 1.
By evacuating the space 12 between the outside of the folded part of the sheet 2 and the vacuum valve body 8 through the air hose 9 slidably supported by the air hose 9, the folded part of the seat 2 is heated.
The suction force in the folding direction acts, and also the terminal fitting 11
Excess adhesive 13 accumulated in the space 12 can be discharged to the outside via the air hose 10 supported by the air hose 10 .

Figure 2 shows the actual construction state of coating formation, in which both ends of pipe 1 (within approximately 200 m) of which coating is required are excavated and exposed by digging holes 15 and 16 (pitched to road 14). In addition to cutting the exposed part, the way! 8
A reversing machine 5 with a near compressor suffum set on the bed of a truck 17 parked at a bit 15 position on a bit 14 is connected to one end of the pipe 1 via a guide hose 4 with the sheet 2 folded back and set. A vacuum pump 19 set on the platform of a truck 18 parked at a pit 16 position on the road 14 is connected to each vacuum air hose 9, 10 via an air tank 20.

In this state, by supplying compressed air to the inside of the sheet 2 and creating a vacuum on the outside of the sheet 2, the sheet 2 smoothly passes through the curved back part due to the combined force of the pressing force of the compressed air and the suction force of the vacuum. The sheet 2 can be easily attached to the bent pipe 1 as shown in Figure 1.
Moreover, since the excess adhesive 16 is discharged during the pasting process, the sheet 2 can be neatly pasted to the inner periphery of the pipe 1.

Note that FIG. 3 shows another embodiment of the present invention, in which the vacuum pulp body 8 is omitted from the embodiment shown in FIGS. 1 and 2, and the terminal fitting 11 at the other end of the pipe 1 is replaced. Pipe 1 in position
This is a case where the interior of the pipe 1 is evacuated by an internal worker, and this is particularly applicable to the pipe 1 whose airtightness is sufficiently ensured.

Next, the effects of the present invention will be explained.

The present invention involves folding and fixing one end of the flexible hose-like sheet to one end of the pipe when the foldable flexible hose-like sheet coated with adhesive is applied to the inner circumferential surface of the pipe while being folded back. In this state, pressurizing force in the folding direction of the flexible hose-like sheet by pumping compressed air inside the folded part of the flexible hose-like sheet, and folding of the flexible hose-like sheet from the other end of the pipe are applied. A coating is applied to the inner circumferential surface of the vibrator, which is attached to the inner circumferential surface of the pipe while the visible hose-like sheet is folded back, using the combined force of the suction force in the folding direction of the flexible hose-shaped sheet created by discharging air from the outside of the part to create a vacuum. It's in the formation method.

As a result, the present invention has the advantage that it can be attached easily and neatly even to curved and buried pipes.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the basic construction method of one embodiment of the present invention, Figure 2
The figure is a diagram illustrating an actual construction method, and FIG. 6 is an explanatory diagram of a construction method according to another embodiment of the present invention. 1...Pipe 2...Seatro...Mouth fitting 4...Guide hose 5...Anti &at! 7.
・・Air Supplier 9.10・Air Hose 11・
...Terminal metal R16...Adhesive 19...Vacuum pump Applicant Yama Co., Ltd. 1) Composition Attorney Patent attorney Oka 1) Hidehiko 14 Kaisho Go-15127 (4)

Claims (2)

[Claims] (1) When attaching a foldable flexible hose-like sheet with adhesive applied to the inner circumferential surface to the inner circumferential surface of a pipe while folding it back, one end of the flexible hose-like sheet is folded back to one end of the pipe and fixed. The pressing force in the folding direction of the flexible hose-like sheet by force-feeding compressed air to the inside of the folded part of the flexible hose-shaped sheet in the folded state, and the folding direction pressure force of the flexible hose-shaped sheet from the other end of the pipe to the folded part of the flexible hose-shaped sheet. It is characterized by pasting the flexible hose-like sheet to the inner peripheral surface of the pipe while folding it by the combined force of the suction force in the folding direction of the flexible hose-like sheet created by discharging the outside air and creating a vacuum. A method of forming a coating on the inner peripheral surface of a pipe. (2) The gJ flexible hose-like sheet is inserted into the pipe while being pasted in a folded state, and the vacuum pulp body is movably inserted into the pipe in a densely layered manner on the inner diameter of the pipe in the outward direction of the folded part. The pipe according to claim 1, wherein a vacuum is created between the vacuum pulp body and the outside of the folded portion of the flexible hose-like sheet through an air hose inserted into the pipe from the other end. Method of forming a film on the inner peripheral surface.