JPH0624667B2 - Pipe inner lining device by pneumatic method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a pipe inner surface lining device by a pneumatic method for performing repair such as forming a resin lining coating film on an inner surface of an existing pipe such as a gas pipe in an embedded state, and more specifically, to a blower from a blower. The jetted air flow and the vortex flow discharged from the tip of the nozzle of the high-pressure hose in the injection cylinder are combined and jetted as a swirling flow, and the swirling flow causes the lining resin to be discharged in an annular shape at the pipe end. It is possible to form a uniform lining coating film while pressing the inner wall of the pipe.

[Prior art]

In general, existing pipes such as gas pipes may have corrosion holes or cracks over time, which may cause a leakage phenomenon, so for the purpose of leakage repair or preventive maintenance,
A method of forming a resin lining coating film on the inner surface of the pipe is adopted. There are various methods for the pipe inner surface lining method. For example, as is clear from JP-A-56-95375, repair resin is injected into the pipe, and the resin is pushed from behind by high pressure air. A lining method by a pneumatic method is known in which a resin lining coating film is formed in the tube while pressing the resin against the inner wall of the tube. That is, in order to form a resin lining coating film while pressing the resin injected into the pipe against the inner wall of the pipe with high pressure air, as shown in FIG. 3, a resin insertion guide pipe 2 is provided at the open end of the existing pipe 1. The resin injecting part 3 is connected via the above, and the resin injected into the existing pipe 1 by the filling pressure from the compressor (not shown) is injected from the nozzle 9 of the high pressure hose 8 disposed in the resin injecting part 3 above. A high-pressure air stream is carried into the pipe, and a spiral screw plate is attached in the nozzle 9 to make the high-pressure air stream a vortex.

[Problems to be Solved by the Invention]

However, in the conventional pipe inner surface lining method by the pneumatic method described above, in order to convey the lining resin supplied into the existing pipe into the pipe while pressing it against the pipe inner wall only by the high-pressure air flow jetted from the nozzle, There is a problem that it takes a long time, not only a sufficient resin is required for the movement, but also a uniform lining coating film cannot be formed over the entire length of the existing pipe. The present invention has been proposed to solve the above problems, in the resin injection portion connected to the existing pipe to be repaired via the resin insertion guide pipe, the air flow sent by the blower, An injection cylinder is installed that combines the vortex flow discharged from the nozzle tip of the high-pressure hose and injects it as a swirl flow.
It is an object of the present invention to provide a pipe inner surface lining device by a pneumatic method in which the resin filled between the resin injection part and the injection cylinder is preliminarily annularly discharged along the inner wall of the existing pipe. is there.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is a pipe inner surface lining device L in which a repair resin C is moved to the inner surface of an existing pipe 1 by a pneumatic method, and the pipe inner surface is lined. A large-diameter outer cylinder part 3a to which the pressurizing means 5 for filling the resin is connected, a small-diameter guide part 3b connected to the end of the existing pipe 1, and between the outer cylinder part 3a and the guide part 3b. The resin injection part 3 consisting of the conical part 3c formed and the resin injection part 3 is inserted into the resin injection part 3 concentrically from the rear end toward the guide part 3b, and the air from the blower 6 is blown. An injection cylinder that receives a flow and that has an outlet 7a that is tapered in a predetermined gap with the guide portion 3b.
7, and the high-pressure air supplied through the high-pressure hose 8 as a vortex flow, which is inserted concentrically from the rear end side of the injection cylinder 7 toward the outlet 7a of the injection cylinder 7 with a predetermined clearance. And a nozzle (9) for opening and jetting.

[Work]

With the above configuration, the lining device L according to the present invention is
When injecting the repairing resin C into the existing pipe 1, the repairing resin C is pressurized by the compressor 5 in the resin injecting part 3 and further pressurized while being guided to the guide part 3b through the conical part 3c. The pressured air from the tapered air outlet 7a of the injection cylinder 7 and the nozzle are sent to the pressurized resin sent to the portion 3b.
The vortex flow from 9 acts as a ring to move on the inner surface of the existing pipe 1 and is pressed against the inner wall surface of the pipe by the swirling flow of high-pressure air, forming a uniform lining coating film over the entire length of the existing pipe 1.

【Example】

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an essential part showing an embodiment according to the present invention, in which reference numeral 1 is an existing pipe to be repaired.
The existing pipe 1 is divided into repair sections each having a length (for example, 100 m) suitable for repair at the time of repair work, and the separation opening end is exposed in the vertical holes A and B opened on the ground.
A lining device L is connected to one of the separation opening ends through a resin insertion guide tube 2, and a resin recovery tank is connected to the other separation opening end through a resin lead-out guide tube 4. The resin injection part 3 has a shape in which a large-diameter outer cylinder part 3a and a small-diameter guide part 3b connected to the resin insertion guide tube 2 are continuous by a conical part 3c. Is a specified repair lining resin C from the resin supply tank,
It is filled and pressurized with the filling pressure from the small compressor 5. Inside the resin injecting part 3, the rear end side is guided and inserted concentrically with the resin injecting part 3 toward the guide part 3b to receive an air flow from the blower 6 and to be provided with a predetermined space between the guide part 3b. An injection cylinder having a tapered outlet 7a with a gap
7 are installed. Further, the high-pressure air supplied through the high-pressure hose 8 is inserted into the injection cylinder 7 concentrically from the rear end side of the injection cylinder 7 as a vortex flow to form a predetermined gap toward the outlet 7a of the injection cylinder 7. There is a nozzle 9 that opens and jets. Here, for example, a spiral screw plate 9a is provided inside the nozzle 9, and high-pressure air becomes a vortex flow, and the air flow blown to the injection cylinder 7 is a nozzle.
The swirl flow merges with the vortex flow from 9 to form a swirl flow, which is injected from the tapered outlet 7a of the injection cylinder 7 into the existing pipe 1. Next, with the lining device L configured in this way,
The operation for lining the inner surface of the pipe will be described. First, the resin injection part connected to the separation opening end of the existing pipe 1.
The lining resin C, which has been filled / pressurized with a predetermined resin pressure in the compressor 3 by the compressor 5, is supplied from the resin injection part 3 to the conical part 3c.
Is further pressurized to reach the guide portion 3b through the guide portion 3b, and the pressurized air from the tapered outlet 7a of the injection cylinder 7 and the vortex flow from the nozzle 9 are applied to the pressurized resin. And act as a ring to move the inner surface of the existing pipe 1,
It is pressed against the inner wall surface of the pipe by the swirling flow of high-pressure air, and a uniform lining coating film is formed over the entire length of the existing pipe 1. FIG. 2 is a cross-sectional view of a swirling flow generating nozzle for high-pressure air showing another embodiment according to the present invention, in which the tip of the nozzle 11 is provided with a pointed conical guide 12, and the outer periphery of the conical guide 12 is described. The blade 13 having an angle in the injection direction of the high-pressure air is attached to the annular injection port that is open to the side, and the injected high-pressure air can be made into a swirling flow.

【The invention's effect】

As explained above, in the pipe inner surface lining device by the pneumatic method of the present invention, the lining device L is connected to the open end of the existing pipe 1 which is the pipe to be repaired, and the lining device L is
The resin injection part 3 including the large-diameter outer cylinder part 3a, the small-diameter guide part 3b, and the conical part 3c, the injection cylinder 7 having the blow-out port 7a inserted into the resin injection part 3, The nozzle 9 is inserted into the injection cylinder 7 and injects a vortex flow. The device according to the invention is therefore simple in structure and easy to operate. Moreover, the resin C for lining which is injected into the existing pipe 1 is filled and pressurized by the compressor 5 in the resin injecting section 3, and further pressurized while reaching the guide section 3b via the conical section 3c, and the guide section 3b. The high pressure resin C is acted concentrically with the pressurized air from the tapered outlet 7a of the injection cylinder 7 and the vortex flow from the nozzle 9, so that the resin C becomes annular and the inner surface of the existing pipe 1 And is pressed against the inner wall surface of the pipe by the swirling flow of high-pressure air. In this state, the resin C reaches the rear end of the existing pipe 1 and can easily form a uniform lining coating film over the entire length of the existing pipe 1. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment according to the present invention, FIG. 2 is a sectional view of a swirling flow generating nozzle for high pressure air showing another embodiment according to the present invention, and FIG. FIG. 4 is a cross-sectional view of a main part showing a means for forming a resin lining coating film by a simple pneumatic method. A, B ... Vertical hole, 1 ... Existing piping, 2 ... Resin insertion guide tube, L ... Lining device, 3 ... Resin injection part, C ...
Resin for repair lining, 3a …… Outer cylinder part, 3b …… Guide part, 3c …… Conical part, 4 …… Resin guide tube, 5 …… Small compressor, 6 …… Blower, 7 …… Injection cylinder, 7a …… Blowout port, 8 …… High pressure hose, 9 …… Nozzle, 9a …… Screw plate, 11 …… Nozzle, 12 …… Conical guide, 13 ……
Wings.

Claims (1)

[Claims] 1. A pipe inner surface lining device (L) in which a repair resin (C) is moved to the inner surface of an existing pipe (1) by a pneumatic method so that the inner surface of the pipe is lined. Is a pressure means (5
) Is connected to a large diameter outer cylinder part (3a), a small diameter guide part (3b) connected to the end of the existing pipe (1), the outer cylinder part (3a) and a guide part (3b). A resin injection part (3) consisting of a conical part (3c) formed between the guide part and the inside of the resin injection part (3) from the rear end side.
It is inserted concentrically with the resin injection part (3) toward b) and blower (6
), And an injection cylinder (7) having an outlet (7a) narrowed in a taper shape with a predetermined gap between the injection cylinder and the guide part (3b). (7) Inserted concentrically with the injection cylinder (7) from the rear end side, and the high pressure air supplied through the high pressure hose (8) is directed as a vortex flow toward the outlet (7a) of the injection cylinder (7). And a nozzle (9) for injecting with a predetermined gap between them, and a pipe inner surface lining device by a pneumatic method.