JPH09268642A - Pipe inside washing method and pig for pipe inside washing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a pipe washing work in a case where a pig is caught by a foreign material so as to cause closing of a pipe during washing the pipe, by reducing the internal pressure of the pig on its way to forcedly feeding so as to contract it and further forcedly feeding the contracted pig so as to remove it. SOLUTION: Gas 5 formed by mixing oxygen and hydrogen is sealed in a space 4b in a pig main body 4a and the pig 4 is expanded to such a diameter as being necessary for washing a pipe by sealed gas pressure 5a. This pig is inserted into a sewage force feed pipe line 1 which is subjected to be washed, forcedly fed to the lower stream side B by water pressure so as to wash the pipe, and on its way to washing the pipe, when this pig 4 is caught by a foreign material so as to cause closing of the pipe, a radio signal of instructing starting of an ignition device 4d is transmitted. A receiver receiving it starts the ignition device 4d, the gas 5 sealed in the space 4b of the pig main body 4a is combusted, its volume is reduced, the pig 4 is contracted, and the contracted pig 4 climbs over the foreign material 3 so as to be sent to the lower stream side B by water pressure and release its closing state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe washing pipe pig.

[0002]

2. Description of the Related Art A cannonball-shaped lump of foamed plastic called a pig is used for washing a sewer pipe. The conventional pipe washing method using this pig is shown in FIG.
As shown in FIG. 3, the pig 2 is inserted from the upstream side A of the sewage pumping line 1, and the pig 2 is pumped toward the downstream side B as shown in FIG.

Since the pig 2 is pressed by the water pressure while being pressed against the inner peripheral surface of the sewage pressure feeding pipeline 1 due to its elasticity, what is attached and precipitated on the inner peripheral surface of the sewage pressure feeding pipeline 1 passes through. Removed with Pig 2.

[0004]

However, in FIG. 3 (c),
As shown in, there is a case where the pig 2 is caught by the foreign matter 3 mixed in the pipe, and the pig 2 does not pass through even if the entire lift of the pump is loaded.

In such a case, conventionally, it is necessary to repair the pipe 2 itself by dismantling it to remove the clogged pig 2. For example, when the pipe is buried underground, after the pipe is dug out, It will take time and effort to dismantle the pipeline.

In addition, it is necessary to specify the point C where the pig 2 is caught in advance, which actually causes a considerable trouble. It is an object of the present invention to provide an in-pipe washing method and an in-pipe washing pig that can take out the caught pig more easily than before even if an accident occurs in which the pig does not pass.

[0007]

According to the method for washing pipes in a pipe of the present invention, when removing a pig clogged in a pipe line during washing with a pig, the internal pressure of the pig during pumping is reduced to shrink the pig. The feature is that the contracted pig is further pumped and removed.

The pipe washing pipe pig of the present invention is a pipe washing pipe pig that is inserted into a pipe line and pressure-fed, in which a gas is enclosed in an internal space and is expanded by the gas pressure, and a pig body An ignition device disposed in the space for igniting the gas is provided, and by igniting the gas by the ignition device, the internal pressure of the space of the pig main body is reduced as compared with that before the gas is ignited. Then, the pig body is contracted, and the closed state is released.

The pipe washing pipe pig of the present invention is a pipe washing pipe pig that is inserted into a pipe line and is pressure-fed, in which a gas is enclosed in an internal space and is expanded by the gas pressure. A reactant holding means for holding a component that chemically reacts with the gas, which is disposed in the space of the main body, and the gas is released by releasing the component held in the reactant holding means. The internal pressure of the space of the pig main body due to the chemical change is reduced as compared with that before the chemical change, and the pig main body contracts to release the closed state.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The pipe washing method according to the present invention will be described below with reference to specific embodiments shown in FIGS. 1 and 2.

As shown in FIG. 2 (a), the pig 4 of the present invention is used.
Is a pig body 4a made of highly elastic foaming polyurethane
And an ignition device 4d attached to the space 4b inside the pig body 4a by an attachment member 4c. Although not shown, the ignition device 4 receives a signal from the outside.
A receiver for activating d is mounted inside or outside the pig 4.

A gas 5 containing a mixture of oxygen and hydrogen is enclosed in the space 4b of the pig body 4a, and the pig 4 is expanded by the gas pressure 5a of the enclosed gas 5 to a diameter required for a washing pipe. There is.

The pig 4 thus expanded by gas pressure is shown in FIG.
As shown in (a) of (a), the pipe is inserted into the sewage pressure feed pipe line 1 for receiving the washing pipe, and is fed by hydraulic pressure toward the downstream side B to wash the pipe. When the pig 4 is caught on the foreign object 3 and is clogged during the washing process as shown in FIG. 1B, a radio signal for instructing the activation of the ignition device 4d is transmitted.

When the receiver which receives this command activates the ignition device 4d, the gas 5 enclosed in the space 4b of the pig main body 4a burns and its volume decreases, so that FIG. 1 (c) and FIG. As shown in (b) of FIG. 1, the pig 4 contracts, and the contracted pig 4 overcomes the foreign matter 3 by water pressure and is sent to the downstream side B as shown in (d) of FIG.

In the above-mentioned embodiment, the combustion gas is enclosed and expanded in the space 4b of the pig body 4a, and this gas is ignited and contracted by the igniter 4d. However, the enclosed pig body 4a is expanded. Depending on the gas, the ignition device 4d is provided with a reactant holding means for holding a component that chemically reacts with the enclosed gas to change into a solid and the internal pressure of the pig body is reduced to a pressure lower than that before the pig body contracts. In the same manner as in the case where the pig body 4a is provided inside the pig body 4a and the ignition device 4d is provided, a radio signal is transmitted when the pig 4 is caught by the foreign substance 3 and clogged during the washing of the pipe, and the reactant holding means is provided. It is also possible to release the component held by the inside of the pig body 4a to contract the pig 4 and eliminate the closed state.

[0016]

As described above, according to the pipe washing method of the present invention, the internal pressure of the pig being pumped is reduced to contract the pig, and the contracted pig is further pumped and removed. Even if the pig is caught by a foreign object in the middle of the process and is blocked, it is not necessary to specify the blocked position in the pipeline and dismantle the pipeline itself as in the conventional case, and the workability of the pipe washing work can be improved. .

The pipe washing pipe pig of the present invention is a pig body in which a gas is enclosed in an internal space and expands by the gas pressure, and an ignition device which is disposed in the space of the pig body and ignites the gas. Since the reactant holding means that holds the component that chemically reacts with the gas is provided, the internal pressure of the pig in the middle of the pipeline is reduced by activating the ignition device or the reactant holding means when blockage occurs. Then, the pig body can be contracted.

[Brief description of drawings]

FIG. 1 is a process chart of a pipe washing process using a pig for pipe washing according to the present invention.

FIG. 2 is a cross-sectional view showing an expanded state and a contracted state of the pipe washing pipe according to the embodiment.

[Fig. 3] Fig. 3 is a diagram of a conventional pipe washing process using a pig for pipe washing

[Explanation of symbols]

 1 Sewage pressure supply pipeline 4 Pig 4a Pig main body 4b Space 4d Ignition device 5 Gas

Claims (3)

[Claims] 1. When removing a pig that has clogged a pipe line with a pig during pipe washing, the internal pressure of the pig during pumping is reduced to shrink the pig, and the swollen pig is further pumped and removed. Tube method. 2. A pipe washing pipe pig inserted into a pipe line and pumped, wherein a gas is enclosed in an internal space and expanded by the gas pressure, and a pig body is provided in the space of the pig body. An ignition device for igniting the gas is provided, and by igniting the gas with the ignition device, the internal pressure of the space of the pig main body is reduced as compared with that before the gas is ignited, and the pig main body contracts. 3. A pipe washing pipe pig inserted into a pipe line and pumped, wherein a gas is enclosed in an internal space and is expanded by the gas pressure, and the pig main body is provided in the space of the pig main body. Reactant holding means holding a component that chemically reacts with the gas is provided, and by releasing the component held in the reactant holding means, the gas chemically changes and the internal pressure of the space of the pig main body becomes A pipe washing pipe pig that contracts the pig body by being decompressed more than before chemical change.