JP2529697B2 - Passage method for water and sewage pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention draws a lining for repairing a pipe inner surface into a pipe having a relatively large diameter such as a water pipe or a sewer pipe, and pulls a pipe inner surface inspection device. The present invention relates to a method of passing a wire for moving in a pipe.

[Conventional technology]

As a conventional method of passing a wire through this type of water and sewer pipe,
Using a parachute-shaped pig connected to a line, connect the line to this pig, and push the parachute-shaped pig from the back side by air pressure to move along the pipe while keeping the shape in close contact with the inner peripheral surface of the pipe. By doing so, a method of passing a wire through a pipe is known (for example, Japanese Patent Publication No. 60-5837 and Japanese Utility Model Publication No. 62-6397).

[Problems to be Solved by the Invention] However, in the case of the conventional method, since the pig is moved in close contact with the inner peripheral surface of the pipe upon receiving the air pressure, the pig may be caught on the adhered deposit or the like on the inner peripheral surface of the pipe. In addition, since the pig is kept in shape by air pressure so that it closely contacts the inner surface of the pipe, if the air blow is interrupted due to a blower failure, etc., the pig will lose its shape and the air will be restarted even if the air blow is restarted. There was a risk that it would not open in close contact with the surface, and as a result, there was a reliability problem that the pig stopped in the middle of the pipe.

Moreover, since the pig is pushed to the downstream side while being brought into close contact with the inner peripheral surface of the pipe by wind pressure, there is a restriction that the blower must be provided at the end of the pipe end where the pig is inserted.

An object of the present invention is to provide a method of in-pipe passage which has excellent reliability, allows easy passage regardless of the difference in pipe cross-sectional shape and pipe diameter, and has no restrictions on the installation surface of the blower. Is in the point of providing.

[Means for solving the problem]

The technical means of the present invention taken to achieve the above-mentioned object is to generate a flow of air from one opening toward the other in a water supply and sewer pipe having both ends opened by a blower, and enclose a gas inside. A wire is fixed to a pig formed by enclosing a plurality of gas enclosures having a reduced apparent specific gravity in a protective bag, and the pig is inserted into the one opening on the upstream side of the water and sewer pipe, Is to transport the pig to the other opening with the air flow.

[Work]

The effect of taking the above technical means is as follows.

Since a gas enclosure is used as the pig, the apparent specific gravity of the pig can be set to be sufficiently small. Therefore,
The pig is not in a state of being forcibly pushed by the wind pressure of the blown air, but can be moved in a floating manner along the pipe while being placed in the air flow. Therefore, it is not necessary to bring the pig into close contact with the inner peripheral surface of the pipe, and it is possible to use a pig having a margin with the inner peripheral surface of the pipe.

b. Also, since the pig is a gas enclosure, its shape does not change significantly like a conventional parachute pig, even if the blow is interrupted, and the blow is restarted and the air flow is resumed. If the occurs, you can move the pig again.

c. And, since the pig used in the present invention is constituted by enclosing a plurality of gas enclosures in a protective bag, it is easy to adapt to the cross-sectional shape of the pipe, and the pipe diameter does not change or bends. Also, it is possible to move while changing the cross-sectional diameter and cross-sectional shape.

d. Moreover, as the acting force for transferring the pig, it suffices to generate an air flow in the pipe, so a blower may be provided at either end of the pipe.

〔The invention's effect〕

The effects of adopting the above configuration are as follows.

I. From the action of a. Above, it is possible to pass the wire through the pipe with good workability, and it is possible to prevent friction and catching on the inner peripheral surface of the pipe when the pig is strongly pressed, and the durability of the pig. Is also advantageous in that

B. Due to the action of b. Above, even if the air flow is interrupted in the middle of the pipeline of the water supply and sewer pipes, the subsequent work can be resumed very quickly.

C. Due to the action of c. Above, a pig with a high degree of freedom in shape and cross-sectional diameter can be obtained, and it can be used regardless of the cross-sectional shape of the pipe or a slight change in the pipe diameter, and has a wide range of practical applications. A useful conduit method was obtained.

D. From the operation of d. Above, the blower can be installed on either the upstream side or the downstream side of the pipe depending on the installation conditions to perform the work.

In addition, as shown in Examples described later, when the blower is provided on the other end opening side in a state where the air in the pipe is discharged from the other end opening, the length of the line dragged by the pig as the pig moves. However, as the pig moves, it moves closer to the blower and the air flow around the pig becomes stronger, which offsets the increase in the movement resistance. It can be moved smoothly.

〔Example〕

 Next, examples of the present invention will be described.

As shown in FIG. 1, a rope for pulling the lining for repairing in the pipe into the water and sewer pipe (A) with both ends opened, and a pipe inspection device along the water and sewer pipe (A) are pulled and moved. The line that will be the leader of the rope (a)
When passing through the water and sewer pipe (A), an air flow is generated in the water and sewer pipe (A) from the one opening (A1) to the other opening (A2) by the blower (1).

Then, the wire (a) is fixed to a pig (2) made of a gas encapsulation body having an apparent specific gravity reduced by enclosing a gas therein, and the pig (2) is attached to the water supply and sewer pipe (A). It is inserted into the one opening (A1) on the upstream side and is transferred to the other opening (A2) by the air flow.

As shown in FIG. 2, the pig (2) is a gas enclosure (2A) in which gas is enclosed to reduce the apparent specific gravity.
This is a structure in which a plurality of balloons are enclosed in a protective bag (2B) such as a plastic bag.

This pig (2) can be changed in size by adjusting the number of balloons that are gas enclosures (2A), and the protective bag (2B) allows the balloons that are gas enclosures (2A). Is prevented from coming into contact with the inner peripheral surface of the water and sewer pipe (A) and bursting. And, this pig (2) is about 30 to 80% of the diameter of the water and sewer pipe (A) in order to efficiently get into the air flow and prevent clogging in the water and sewer pipe (A). Is desirable.

Further, the blower (1) is installed on the other opening (A2) side while discharging the air in the water and sewer pipe (A) from the other opening (A2). Therefore, the blower (1) does not interfere with the introduction of the line (a) into the water and sewer pipe (A).

[Another embodiment]

 Another embodiment of the present invention will be described below.

[1] As shown in FIG. 3, the pig (2) is formed into a bullet shape. In this case, since the cross-sectional diameter of the pig (2) can be formed in a small size for the buoyancy, even if the water and sewer pipe (A) is bent, it is easy to smoothly pass through the bent portion.

[2] In the above embodiment, the gas enclosure (2) of the pig (2) is used.
As A), a balloon is shown, but the inclusion body (2
As A), various things such as paper-like, film-like, etc. can be used, and if the structure is such that gas is enclosed to reduce the apparent specific gravity and it is easy to get into the air flow, its shape, Any structure may be used.

[3] The blower (1) is provided on one opening (A1) side for implementation.

[4] Implement the blower (1) at both openings (A1) and (A2).

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view and FIG.
FIG. 3 is a partially cutaway side view of the pig, and FIG. 3 is a side view of the pig showing another embodiment of the present invention. (1) …… Blower, (2) …… Pig, (A) …… Water and sewer pipes, (A1), (A2) …… Opening, (a) …… Line.

Claims (2)

(57) [Claims] 1. A blower (1) generates an air flow from one opening (A1) to the other opening (A2) in a water and sewer pipe (A) having both ends open, and gas is enclosed inside. Then, the wire (a) is fixed to the pig (2) formed by enclosing a plurality of gas enclosures (2A) whose apparent specific gravity is reduced in the protective bag (2B). A water and sewer pipe passage method in which the pig (2) is inserted into the one opening (A1) on the upstream side of the water and sewer pipe (A) and transferred to the other opening (A2) by the air flow. 2. The blower (1) is provided on the other opening (A2) side in a state where the air in the water and sewer pipe (A) is discharged from the other opening (A2). The method for passing through a water supply and sewerage pipe according to item 1.