JP2000197852A - Method for lining inner wall surface of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for lining the inner wall surface of a pipe which is efficient and low in costs, can respond to leakage, and can reduce damage by fluid pressure. SOLUTION: A large diameter pipe 1 having an on-off valve 3 fitted to an inlet 1a is connected with a small diameter pipe 2 which has an on-off valve 5 fitted to an outlet 2a and is connected with a suction means. A lining material (a), which was injected into the inlet 1a of the pipe 1 by the pressure difference generated by the operation of the valve 3, and an inserted coating pig 6 are moved in turn in the pipe to apply the lining material on the inner wall surface of the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating pipe which has elasticity and can be applied to the inner wall of a large-diameter pipe and a small-diameter pipe connected to the existing pipe. The present invention relates to a pipe inner wall lining method for moving a lining material supplied to a large-diameter pipe to a pipe inner wall surface by moving the pipe inside by the suction action of a suction means provided at an outlet.

[0002]

2. Description of the Related Art Conventionally, in order to line a liquid paint on the inner wall surface of a large-diameter pipe and a small-diameter pipe connected to the large-diameter pipe, a large-diameter pig is pulled by a towing wire and lined. In the same way, the towing is performed separately and the lining is performed separately, or the lining is performed while pressing and moving the pig by pressurizing the compressed air from one side. Had to go separately.

[0003]

In the pipe inner surface lining method according to the prior art, a pig is pulled and moved in the pipe, or a fluid is pressurized and pushed and moved instead of pulling. However, in the above-mentioned methods, the lining of the large-diameter pipe and the small-diameter pipe are performed separately, and the work is troublesome, the work efficiency is not good, and the reduction of the construction cost is difficult. Further, in the latter case, there is a possibility that the pressurized fluid is sent before the lined film is hardened and the film is broken by this pressure, and there is a problem that if there is a leak portion, the applied pressure changes and the pressure is not suitable.

[0004]

In view of such circumstances, the present invention, in order to solve this problem, connects a large-diameter pipe having an on-off valve at the inlet and suction means having an on-off valve at the outlet. Connect a small-diameter pipe, and a suction action by suction means from the outlet,
Due to the differential pressure caused by the operation of the opening / closing valve at the inlet, the liquid lining material supplied to the large-diameter pipe inlet and the inserted scalable and applicable coating pig are sequentially advanced inside the pipe to apply the lining material to the inner wall of the pipe. It provides a lining method, that is, a large-diameter pipe and a small-diameter pipe can be continuously worked at a time by performing a suction action by using a coating pig which can be expanded and contracted, so that an efficient and economical lining method is provided. Is provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pipe inner wall lining method of the present invention will be described with reference to the drawings.

As shown in FIG. 1 (A), a large-diameter pipe 1 and a small-diameter pipe 2 connected in series at a connection portion thereof have an on-off valve 3 at an inlet 1a of the large-diameter pipe 1. An inlet pipe 4 is detachably mounted, and an outlet 2 a of the small diameter pipe 2 is connected to a suction device (not shown) via an on-off valve 5. In addition, large-diameter pipe 1
A suitable amount of lining material (paint) a is injected into the inlet 1a of the, and it can be expanded or contracted to match the lining thickness.
Moreover, a coating pig 6 that can be coated is inserted.

As shown in FIG. 1B, when lining is performed, the on-off valve 5 of the suction device connected to the outlet 2a is used.
Is opened, and a vacuum is applied to the inside of the tube by the suction action of the suction device. On the other hand, the on-off valve 3 of the inlet 1a is opened to introduce the atmosphere into the tube to atmospheric pressure. A thrust is applied to the coating pig 6 and the lining material a in the pipe is flushed forward to apply the lining material a to the inner wall surface of the large-diameter pipe 1. The thrust applied to the pig 6 in this case is performed by adjusting the on-off valve 3. In some cases, adjustment may be made by providing a chamber in the pipe on the inlet side.

As shown in FIG. 1 (C), when the coating pig 6 advances to the connection portion, the coating pig 6 is reduced by the above-described expansion and contraction action and is sucked into the front small-diameter pipe 2 by a suction force and advances. The paint collected on the outlet 2a is applied to the inner wall surface of the small diameter pipe 2. That is, the inner wall surface of the pipe is lined.

FIG. 2 shows the lining of the branch pipe 12 from the large-diameter pipe 11, and the one shown in FIG.
It has a large-diameter pipe 11 and a branch pipe 12 branching from the large-diameter pipe 11 in a T-shape.
An inlet tube 14 having an inlet 3 is mounted, while the outlet 11b is connected to a suction device via an on-off valve 17. Further, an outlet 12a of the branch pipe 12 is connected to the suction device via an on-off valve 15, and a lining material a to be injected from an inlet 11a of the large-diameter pipe 11 and a coating pig 16 inserted and scalable and capable of coating. Valve provided at the outlet 12a of the branch pipe 12
5 is opened to make the large-diameter pipe 11 a negative pressure by the suction action of the suction device, and the on-off valve 13 at the inlet 11a of the large-diameter pipe 11 is opened to introduce air from the inlet 11a. 16 and the lining material a is pushed forward to flush the connection portion of the branch pipe 12, and the large-diameter pipe 11
And the large-diameter pipe inner wall surface up to the connection portion of the branch pipe 12 is applied.
At this time, of course, the opening / closing valve 17 communicating with the outlet 11b of the large-diameter pipe 11
Is closed.

As shown in FIG. 2 (B), the lining material a which has been flushed to the connecting portion of the branch pipe 12 is left in a state where a part of the lining material a remains in the large-diameter pipe 11 due to the suction action from the branch pipe 12. Pig 1 for application while sucking into branch pipe 12
6 is advanced toward the outlet 12a of the outlet 12 of the branch pipe 12 to apply the inner wall surface of the branch pipe 12, and the coating pig 16 is collected by the outlet 12a.

As shown in FIG. 2C, when the coating pig 16 is recovered through the outlet 12a shown in FIG.
Is switched to the on-off valve 17 provided at the outlet 11b of the large diameter pipe 11. This switching is performed when the coating pig 16 is inserted again from the inlet 11a of the large-diameter pipe 11.
When the on-off valve is switched, the inside of the large-diameter pipe 11 is moved toward the outlet 11b by suction, and the branch pipe 12 is inserted into the large-diameter pipe 11.
The remaining inner wall surface of the large-diameter pipe 11 is applied while flushing the lining material a remaining and remaining at the connecting portion of the connecting pipe, and the coating pig 16 is collected at the outlet 11b.

[0012]

As described above, according to the present invention, it is possible to apply the inner wall surface of an arbitrary pipe at a time by the suction action of the suction means, the work can be performed efficiently, the labor is not required, and the construction cost is low. Becomes Further, since the suction operation is used, the present invention can be applied to a leak pipe, and has effects such as little damage to a fluid pressure.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one use form of a pipe inner wall lining method according to the present invention.

FIG. 2 is an explanatory view of another use mode of the pipe inner wall surface lining method of the present invention.

[Explanation of symbols]

 1,11 Large-diameter pipe 1a, 11a Inlet 11b, 12a Outlet 2 Small-diameter pipe 12 Branch pipe 3,5,13,15,17 On-off valve 4,14 Inlet pipe 6,16 Pig for coating a Lining material

Claims (1)

[Claims] 1. A large-diameter pipe having an on-off valve provided at an inlet thereof, and a small-diameter pipe connected to a suction means having an on-off valve provided at an outlet thereof.
The suction action of the suction means from the outlet and the pressure difference due to the opening and closing valve operation of the inlet cause the liquid lining material supplied to the large-diameter pipe inlet and the inserted expandable and scalable coating pig to be sequentially propelled and moved in the pipe. An inner wall lining method for applying a lining material to the wall.