JP2012159132A - In-pipeline pig moving device as well as in-pipeline residual gas exhausting method, in-pipeline inspection method, in-pipeline surface lining method, in-pipeline cleaning method and in-pipeline wire-passing method using the in-pipeline pig moving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-pipeline pig moving device with which predetermined processing can be executed by simple preparation work.SOLUTION: The in-pipeline pig moving device includes a pig 1 having elasticity and a surface at least composed in an airtight manner, and inserted into a pipeline whose one end is closed in a contracted state, and a pig moving means M for moving the pig 1 in the pipeline. A tip end of a tubular body T is firmly fixed to the pig 1 while the front part 1f through the tip Tf directed toward the closing end side of the pipeline in the pig 1 are exposed when the pig 1 is inserted into the pipeline. The pig moving means M is composed having a suction means 2 for sucking gas in the closing end side than the pig 1 inserted into the pipeline through the tubular body T to the outside of the pipeline.

Description

  The present invention provides a pig having elasticity and at least a surface configured to be airtight, and inserted in a contracted state into a pipe line in which one end is closed, and a pig moving means for moving the pig in the pipe line In-pipe pig moving device, and in-pipe residual gas exhausting method, in-pipe inspection method, in-pipe inner lining method, in-pipe cleaning method, and pipe using the in-pipe pig moving device It relates to the intra-road line method.

Such an in-pipe pig moving apparatus inserts a pig having elasticity and at least a surface configured to be airtight into the pipe in a contracted state, and the pipe is partitioned in an airtight manner in the longitudinal direction. In this state, the pig is moved in the pipeline by causing a pressure difference between the two sides of the pig in the pipeline by the pig moving means.
Such an in-pipe pig moving device is, for example, a residual gas exhaust process in a pipe that exhausts gas remaining in a pipe such as a gas pipe buried in the ground. In-pipe inspection process to be inspected, pipe inner surface lining process to form a lining film on the inner surface of the pipe line, in-pipe cleaning process to clean the inside of the pipe line, in-pipe line to pass a linear body in the pipe line It is used for the purpose of executing various processes in the pipeline such as processes.

In such an intra-pipe pig moving device, conventionally, the pig moving means is configured to include a suction means that acts on the closed end of the pipe.
In other words, the pressure of the portion closer to the closed end than the pig in the pipeline is reduced by causing the suction means to suck the closed end portion of the pipeline and reducing the pressure on the closed end side of the pig in the pipeline. The pressure in the portion on the opening end side of the pipe in the pipe line is lower than the atmospheric pressure (that is, atmospheric pressure), and the pig is moved in the pipe line from the opening end side to the closed end side (for example, (See Patent Documents 1 and 2.)
In addition to the above suction means, the pig moving means may include a compressed air supply means for supplying compressed air to the opening end of the pipe.
In other words, the suction means is sucked to the closed end portion of the pipeline, and compressed air is supplied to the open end portion of the pipeline by the compressed air supply means, so that the portion closer to the opening end than the pig in the pipeline is closed. By making the pressure higher than the end portion, the pig is moved in the pipeline from the open end side to the closed end side (see, for example, Patent Documents 1 and 2).

When such an in-pipe pig moving device is used in the in-pipe cleaning process, the pig is moved in the pipe in a state where the cleaning agent is present on the front side in the moving direction from the pig in the pipe. By moving, the inside of the pipeline is washed by rubbing the inner surface of the pipeline to which the cleaning agent is adhered.
Also, when used in in-pipe line processing, with the tip of the linear body connected to the rear part of the pig, the line is moved into the pipe line by moving the pig toward the closed end. Will pass through the body.

  Further, although not described in the above-mentioned Patent Documents 1 and 2, when using such a pipe moving device in a pipe for exhausting residual gas in the pipe, insert the pig into the open end of the pipe. By sucking the suction means to the closed end of the pipe, the residual gas in the pipe is sucked and exhausted. That is, the suction means is sucked to the closed end portion of the pipeline, and the pig is moved in the pipeline from the open end toward the closed end, so that the gas to be exhausted in the pipeline remains. By exhausting the residual gas while gradually narrowing the range, the residual gas can be efficiently exhausted.

JP-A-8-289432 JP 2010-51885 A

However, conventionally, the pig moving means is configured to include suction means that acts on the closed end portion of the pipe line. Therefore, in order to cause the suction means to act on the closed end part of the pipe line, the intake pipe is connected to the pipe. A preparatory work is required to communicate with the closed end of the road and connect the suction means to the intake pipe. This preparatory work is laborious.
For example, in the case where the target pipe line is a gas pipe buried in the ground, in addition to excavating the place where the opening end for inserting the pig is buried, the end corresponding to the closed end It is necessary to excavate the place where the burial is buried and to connect the intake pipe to the closed end portion thereof. Further, when a building such as a building is constructed above the closed end, the closed end cannot be excavated.
Further, when the pig moving means is configured to include a compressed air supply means in addition to the suction means, the cover body is closed on the opening end of the conduit, and then the air supply pipe is connected to the lid body. Therefore, it is necessary to connect the compressed air supply means to the air supply pipe, and further preparation work is required.

By the way, as a method of exhausting the residual gas in the gas pipe buried in the ground, there is a method of performing without using the pipe moving device in the pipeline.
That is, a suction pump is connected to the open end of the gas pipe, the inside of the gas pipe is evacuated, the vacuum state is opened, and air is allowed to flow in from the open end of the gas pipe. It is a method of exhausting outside.
In this method, it is not necessary to excavate the portion where the closed end of the gas pipe is buried, so that the preparation work can be simplified.
However, since the entire internal space of the gas pipe is to be aspirated by the suction pump, it takes time to exhaust the residual gas in the gas pipe sufficiently, and air is allowed to flow in by opening the vacuum state to remove the residual gas. It takes time to replace the air, and there is a problem that the working time becomes long.
Further, in this method, for example, when the gas concentration of the gas exhausted from the open end of the gas pipe is equal to or lower than the set concentration, it can be determined that the residual gas is replaced with air. However, since the gas whose gas concentration is to be measured is a gas drawn from the vicinity of the open end of the gas pipe, it is possible to appropriately determine whether the residual gas near the closed end of the gas pipe is sufficiently exhausted. It may not be possible. Therefore, as a time required for sufficiently replacing the residual gas with air, it is necessary to secure a time sufficient to determine that the residual gas near the closed end of the gas pipe is sufficiently exhausted, and a long working time is required. Conversion has become a prominent problem.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an in-pipe pig moving apparatus capable of executing a predetermined process with a simple preparatory work. It is an object of the present invention to provide a method for exhausting residual gas in a pipe, an in-pipe inspection method, a pipe inner surface lining method, a pipe cleaning method, and a pipe passage method that can perform each process with a simple preparatory work.

An in-pipe pig moving device according to the present invention has an elasticity and at least a surface configured to be airtight, and is inserted in a contracted state into a pipe line in which one end is closed, and the pig is connected to the pipe. A pig moving means for moving in the road,
The first characteristic configuration is an insertion state in which a tip is exposed from a front portion facing the closed end side of the conduit in the pig when the pig is inserted into the conduit, and the tip of the tubular body is the pig Fixed to
The pig moving means is configured to include suction means for sucking the gas at the closed end side of the pig inserted into the pipeline through the tubular body to the outside of the pipeline.

According to the above characteristic configuration, the pig is inserted into the duct from the open end, and the suction means is caused to act on the proximal end of the tubular body, so that the residual gas in the portion closer to the closed end than the pig in the duct is tubular. Suction through body and exhaust. Then, the portion closer to the closed end than the pig in the conduit is depressurized, and the portion closer to the closed end than the pig in the conduit is at a lower pressure than the portion closer to the open end than the pig. It is pushed to the closed end side by atmospheric pressure and moves in the pipeline toward the closed end side. In addition, as the pig moves in the pipeline toward the closed end, the volume of the portion on the closed end side gradually becomes smaller than the pig in the pipeline that is the target of the pig suctioning action, Since the residual gas can be exhausted efficiently, the pig can be quickly moved to the closed end.
Then, by adjusting the suction force of the suction means, it is possible to adjust the moving speed of the pig toward the closed end in the pipeline.
In this way, by moving the pig to the closed end side in the pipeline, the residual gas exhaust process in the pipeline to exhaust the gas remaining in the pipeline, and in the pipeline to inspect the pipeline with the camera Inside the pipeline, such as inspection processing, pipeline inner lining treatment that forms a lining film on the pipeline inner surface, pipeline washing treatment that cleans the inside of the pipeline, and pipe internal passage processing that passes a linear body through the pipeline Various processes can be executed.
In addition, when performing various processes in this manner, the moving speed of the pig in the pipeline can be adjusted to an appropriate speed according to each process by adjusting the suction force of the suction means.

And, when moving the pig to the closed end in the pipeline, there is no need to perform any processing on the closed end of the pipeline, and the preparation work can be simplified. For example, in the case of a gas pipe in which the target pipe line is buried in the ground, the portion where the opening end for inserting the pig is buried is equivalent to the closed end portion even though it is necessary to excavate. Since it is not necessary to excavate the portion where the end portion to be embedded is buried, the preparation work can be greatly simplified.
Accordingly, it is possible to provide an in-pipe pig moving apparatus capable of executing a predetermined process with a simple preparatory work.

Further features of the in-pipe pig moving device according to the present invention are as follows:
The pig moving means sucks gas through the tubular body by the compressed air supply means for supplying compressed air through the tubular body to the closed end side of the pig inserted into the conduit, and the suction means. Switching means that can be switched between a state in which the compressed air is supplied and compressed air is supplied through the tubular body by the compressed air supply means.

According to the above characteristic configuration, the switching means is switched to a state in which the suction means is connected to the proximal end of the tubular body, and the suction means is sucked to the proximal end of the tubular body, whereby the pig is closed in the pipeline. The switching means is switched to a state in which the compressed air supply means is connected to the proximal end of the tubular body, and the compressed air supply means moves the compressed air to a portion closer to the closed end than the pig in the pipeline. Supply. Then, the portion on the closed end side of the pipe in the pipeline is at a higher pressure than the portion on the open end side of the pig, so the pig is pushed toward the open end side and moves in the pipeline toward the open end side. To do.
Then, by adjusting the pressure of compressed air supplied by the compressed air supply means or the supply amount per unit time, it is possible to adjust the moving speed of the pig toward the open end in the pipe.

That is, by supplying compressed air to the proximal end of the tubular body by the compressed air supply means, the pig moved to the closed end side in the pipe line can be returned to the open end side and easily taken out from the pipe line. .
In addition, when the pig is moved to the opening end side in the pipe line, various processes can be executed as necessary, and the various air is supplied by the compressed air supply means when executing the various processes. By adjusting the pressure of compressed air or the supply amount per unit time, the moving speed of the pig in the pipe line can be adjusted to an appropriate speed according to each process.

A method for exhausting residual gas in a pipeline according to the present invention exhausts residual gas in a pipeline using the in-pipe pig moving device according to claim 1 or 2,
The characteristic configuration is that the pig is inserted into the opening end of the conduit, and the suction means sucks the residual gas in the portion closer to the closed end than the pig in the conduit through the tubular body. By evacuating, the pig is moved to the closed end side in the pipeline, and the residual gas in the pipeline is exhausted.

  According to the above characteristic configuration, the pig is inserted into the opening end of the pipeline and sucked by the suction means, so that the residual gas in the closed end side of the pig is exhausted, and the pig is placed inside the pipeline. It can be moved to the closed end side. Thus, while replacing the residual gas on the opening end side of the pig with air, the pig can be moved to the closed end side, and the replacement of the residual gas with air can be performed quickly. In addition, since the suction means sucks the residual gas in the portion closer to the closed end than the pig, the residual gas is sufficiently exhausted even near the closed end of the pipeline by detecting the gas concentration of the sucked gas. It is possible to accurately determine whether or not

When using the in-pipe pig moving device according to claim 2, the switching means is switched to a state in which the compressed air supply means is connected to the proximal end of the tubular body, and the compressed air is supplied by the compressed air supply means. When supplied to a portion closer to the closed end than the pig in the channel, the pig moves in the pipeline toward the open end side by the same action as described for the in-pipe pig moving device of claim 2 above. Therefore, the pig can be easily taken out from the pipe line.
In executing the above-described method for exhausting residual gas in a pipeline, as described above with respect to the in-pipe pig moving device according to claim 1, it is necessary to perform some processing on the closed end of the pipeline. Since it is not, preparation work can be simplified.
Therefore, it has become possible to provide a method for exhausting residual gas in a pipe that can execute a process for exhausting residual gas in the pipe with a simple preparatory work.

The in-pipe inspection method according to the present invention is for inspecting the inside of a pipe line using the in-pipe pig moving device according to claim 1 or 2,
The characteristic configuration is that the camera is held in a position corresponding to the vicinity of the pig in the pig or the tubular body so that the inside of the pipe can be photographed, and the suction means is more than the pig in the pipe. The gas at the closed end side is sucked and exhausted through the tubular body, or is provided with compressed air supply means, and the compressed air supply means provides a portion closer to the closed end than the pig in the pipeline. By supplying compressed air through the tubular body, the pig is moved in the pipeline, and the inside of the pipeline is inspected based on photographing information of the camera.

  According to the above characteristic configuration, the pig is inserted into the opening end of the pipe line with the camera held at a position corresponding to the vicinity of the pig or the pipe in the tubular body, and the pig in the pipe line is sucked by the suction means. By sucking and exhausting the gas in the portion closer to the closed end through the tubular body, the same action as described above for the in-pipe pig moving apparatus of claim 1 is exhibited, and the pig is connected to the pipe line. Move to the closed end side. As the pig moves, the inside of the pipeline is photographed by the camera, and the inside of the pipeline can be inspected based on the photographing information of the camera.

Alternatively, with the camera held as described above, the pig is inserted into the open end of the conduit, and the gas at the closed end side of the pig in the conduit is sucked through the tubular body by the suction means. By evacuating, the same action as described for the in-pipe pig moving apparatus of claim 1 is exhibited, and the pig is moved to the closed end side in the pipe.
Subsequently, the switching means is switched to a state in which the compressed air supply means is connected in communication with the proximal end of the tubular body, and the compressed air is supplied to the portion closer to the closed end than the pig in the pipeline by the compressed air supply means. Then, the pig moves in the pipeline toward the opening end side by the same action as described for the in-pipe pig moving device of claim 2 above. The inside of the pipeline is photographed, and the inside of the pipeline can be inspected based on the photographing information of the camera.
In inspecting the inside of the pipe line as described above, the pipe line is adjusted by adjusting the suction force of the suction means or by adjusting the pressure of compressed air supplied by the compressed air supply means or the supply amount per unit time. Because it is possible to adjust the moving speed of the pig in the interior, it is convenient to adjust the moving speed of the pig according to the degree of inspection, such as slowing the moving speed for places that require precise inspection. .
In executing the above-described in-pipe inspection method, as described above with respect to the in-pipe pig moving apparatus according to claim 1, it is not necessary to perform any processing on the closed end of the pipe. Preparatory work can be simplified.
Accordingly, it is possible to provide an in-pipe inspection method capable of executing a process for inspecting the inside of a pipe line with a simple preparatory work.

A pipeline inner surface lining method according to the present invention is a method of forming a lining film on the pipeline inner surface using the in-pipe pig moving device according to claim 1 or 2,
The characteristic configuration is that, in the state where the lining film forming liquid is present on the moving direction side of the pig in the pipe line, the suction means is provided on the closed end side portion of the pipe in the pipe line. Gas is sucked and exhausted through the tubular body, or is provided with compressed air supply means, and compressed air is supplied through the tubular body to the closed end side portion of the pipe in the pipeline by the compressed air supply means. To move the pig to the lining film forming liquid existing side in the pipe and apply the lining film forming liquid to the inner surface of the pipe to form the lining film. In the point.

According to the above characteristic configuration, the lining film forming liquid is filled into the pipe line from the opening end, and then the pig is inserted into the pipe line from the opening end. Then, the lining film forming liquid is present on the closed end side (corresponding to the moving direction side) of the pig in the duct.
Then, the gas in the portion closer to the closed end than the pig in the conduit is sucked and exhausted by the suction means through the tubular body.
Then, because the pig moves to the closed end side in the pipeline due to the same action as described for the in-pipe pig moving device of claim 1, the outer peripheral surface of the pig moving in the pipeline, A liquid for forming a lining film is applied to the inner surface of the pipe, and the applied film is cured to form a lining film.

Alternatively, the pig is inserted into the open end of the pipe, and the gas in the closed end side of the pig in the pipe is sucked and exhausted through the tubular body by the suction means. The same action as described for the in-pipe pig moving apparatus is exhibited, and the pig is moved to the closed end side in the pipe line.
Subsequently, the lining liquid is filled from the opening end into the vicinity of the pig in the pipe line, and the liquid for forming the lining film exists on the opening end side (corresponding to the moving direction side) of the pig in the pipe line. State.
Then, the switching means is switched to a state in which the compressed air supply means is connected in communication with the proximal end of the tubular body, and the compressed air is supplied to the portion closer to the closed end than the pig in the pipeline by the compressed air supply means. Then, the pig moves in the pipeline toward the opening end side by the same action as described for the in-pipe pig moving device of claim 2 above, so that the outer peripheral surface of the pig moving in the pipeline Thus, the lining film forming liquid is applied to the inner surface of the pipe, and the applied film is cured to form a lining film.

  In forming the lining film as described above, by adjusting the suction force of the suction means, or adjusting the pressure of compressed air supplied by the compressed air supply means or the supply amount per unit time, Since the moving speed of the pig moving can be adjusted, the thickness of the coating film of the liquid for forming the lining film can be adjusted, so that the film thickness of the lining film can be adjusted.

And when performing the above-mentioned pipe inner surface lining method, as explained in the pipe moving device in pipe of claim 1, it is not necessary to apply any processing to the closed end of the pipe. Preparatory work can be simplified.
Therefore, it has become possible to provide a pipeline inner surface lining method capable of executing a process of forming a lining film on the pipeline inner surface with a simple preparatory work.

The pipe cleaning method according to the present invention is for cleaning the inside of a pipe using the pipe moving device in the pipe according to claim 1 or 2,
The characteristic configuration is that in the state where the cleaning agent is present on the moving direction side of the pig in the pipe line, the gas in the portion closer to the closed end than the pig in the pipe line is passed by the suction means. The air is sucked and exhausted through the tubular body, or is provided with compressed air supply means, and the compressed air supply means supplies compressed air through the tubular body to the portion closer to the closed end than the pig in the pipeline. Accordingly, the pig is moved to the side where the cleaning agent is present in the pipe, and the inside of the pipe is cleaned with the cleaning agent.

According to the above characteristic configuration, the pig is inserted into the pipe line from the open end, and the cleaning liquid is present in front of the pig (corresponding to the moving direction side) by the suction means from the pig in the pipe line. Also, the gas at the closed end side is sucked and exhausted through the tubular body.
Then, the pig moves to the closed end side in the pipe line by the same action as described in the pipe pipe moving apparatus of the first aspect, so that the inner surface of the pipe line is piggybacked with the cleaning liquid interposed. The inner surface of the conduit can be cleaned.
Alternatively, the pig is inserted into the open end of the pipe, and the gas in the closed end side of the pig in the pipe is sucked and exhausted through the tubular body by the suction means. The same action as described for the in-pipe pig moving apparatus is exhibited, and the pig is moved to the closed end side in the pipe line.
Subsequently, in a state where the cleaning liquid is present in front of the pig (corresponding to the moving direction side), the switching means is switched to a state in which the compressed air supply means is connected to the proximal end of the tubular body, and the compressed air supply means Compressed air is supplied to the closed end side of the pig in the pipeline. Then, the pig moves in the pipeline toward the opening end side by the same action as described for the in-pipe pig moving device of claim 2 above, and therefore the inner surface of the pipeline in the state where the cleaning liquid is interposed. Can be rubbed on the surface of the pig to clean the inner surface of the conduit.

  When cleaning the inner surface of the pipe as described above, the suction force of the suction means is adjusted, or the pressure of compressed air supplied by the compressed air supply means or the supply amount per unit time is adjusted. The moving speed of the pig moving in the road can be adjusted to a speed suitable for cleaning the inner surface of the pipe.

In executing the above-described pipe cleaning method, as described above with respect to the pipe moving device in pipe 1, there is no need to perform any processing on the closed end of the pipe. Preparatory work can be simplified.
Accordingly, it is possible to provide an in-pipe cleaning method capable of executing a process of cleaning the inside of the pipe with a simple preparatory work.

An in-pipe passage method according to the present invention is to pass a linear body into a pipe line using the in-pipe pig moving device according to claim 1,
The characteristic configuration is that, with the tip of the linear body fixed at a position corresponding to the vicinity of the pig in the pig or the tubular body, the pig is inserted into the open end of the conduit, and the suction is performed. By means of means for sucking and exhausting the gas in the closed end side of the pipe in the pipeline through the tubular body, the pig is moved to the closed end side in the pipeline, It exists in the point which lets the said linear body pass in the said pipe line.

According to the above characteristic configuration, the pig is inserted into the open end portion of the pipe line in a state where the tip of the linear body is fixed at a position corresponding to the vicinity of the pig in the pig or the tubular body.
Then, the gas in the portion closer to the closed end than the pig in the conduit is sucked and exhausted by the suction means through the tubular body.
Then, due to the same action as described for the in-pipe pig moving apparatus according to claim 1, the pig moves to the closed end side in the pipe, and the linear body is pulled by the moving pig. Therefore, the linear body can be passed through the pipeline.

And when performing the above-mentioned in-pipe connection method, as explained about the in-pipe pig moving apparatus of claim 1, it is not necessary to apply any processing to the closed end of the pipe. Therefore, preparation work can be simplified.
Accordingly, it is possible to provide an in-pipe connection method capable of executing a process of passing a linear body in a pipe by a simple preparation operation.

Block diagram of an in-pipe pig moving device according to the first embodiment Partially cutaway perspective view of a pig according to the first embodiment Sectional drawing in the surface which passes along the axial center of the pig concerning 1st Embodiment The figure explaining the residual gas exhaust method in a pipe line concerning a 1st embodiment Vertical section in the state where the pig concerning a 2nd embodiment was inserted in the pipe line The figure explaining the inspection method in a pipe line concerning a 2nd embodiment Sectional drawing in the surface which passes along the axial center of the pig concerning 3rd Embodiment The figure explaining the pipe inner surface lining method concerning a 3rd embodiment The longitudinal cross-sectional view of the pipe line explaining the pipe line inner surface lining method concerning 3rd Embodiment Sectional drawing in the surface which passes along the axial center of the pig which concerns on 4th Embodiment The figure explaining the cleaning method in a pipe line concerning a 4th embodiment Longitudinal cross-sectional view of a pipeline explaining a method for cleaning an inside of a pipeline according to a fourth embodiment Sectional drawing in the surface which passes along the axial center of the pig which concerns on 5th Embodiment The figure explaining the in-pipe connection method which concerns on 5th Embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
In the first embodiment, an in-pipe residual gas exhausting method for exhausting residual gas in the pipe using the in-pipe pig moving device will be described.
In the first embodiment, a gas pipe P buried in the ground is applied as a specific example of the pipe line. The gas pipe P is for supplying a gas fuel such as city gas to a consumer such as a household, and at least one end is in a closed state and is buried in the ground over the entire length.

First, the in-pipe pig moving device will be described.
As shown in FIGS. 1 and 4, the in-pipe pig moving apparatus is inserted into the gas pipe P in a contracted state in the gas pipe P having elasticity and at least the surface being hermetically sealed and having one end Pf closed. It comprises a pig 1 and a pig moving means M that moves the pig 1 within the gas pipe P.
In the present invention, when the pig 1 is inserted into the gas pipe P, the distal end portion of the tubular body T is inserted in a state where the distal end Tf is exposed from the front portion 1f of the pig 1 facing the closed end Pf side of the gas pipe P. Is fixed to the pig 1.
Then, the pig moving means M is in the vacuum pump 2 as the suction means for sucking the gas G closer to the closed end Pf than the pig 1 inserted into the gas pipe P through the tubular body T to the outside of the gas pipe P. The air compressor 3 as compressed air supply means for supplying the compressed air A through the tubular body T to the closed end Pf side of the pig 1 inserted in the pipe 1 and the state in which the gas G is sucked by the vacuum pump 2 through the tubular body T ( Hereinafter, a three-way valve as switching means that can be switched between an intake state and a state in which compressed air A is supplied by the air compressor 3 through the tubular body T (hereinafter also referred to as a discharge state). 4.

As shown in FIGS. 2 and 3, the pig 1 is made elastic by covering the entire surface of the pig body 1 </ b> H formed in an approximately sponge shape with an elastic sponge with a non-breathable and elastic coating 1 </ b> S. And the surface is airtight. Incidentally, the bowl shape is generally a shape in which both ends of a cylinder are hemispherically rounded.
The sponge forming the pig body 1H is a single-bubble sponge in which bubbles are independent one by one, and is made of, for example, a synthetic resin such as urethane resin. The film 1S is formed by applying a resin paint that can form a film that is non-breathable and excellent in slipperiness with the inner surface of the gas pipe P, such as a vinyl resin paint, to the entire surface of the pig body 1H.

The outer diameter of the pig 1 (the outer diameter of the cylindrical portion) is set to be slightly larger than the inner diameter of the gas pipe P to be inserted. For example, when the inner diameter of the gas pipe P is 152 mmφ, the outer diameter of the pig 1 is set to 170 mmφ, for example.
When such a pig 1 is inserted into the gas pipe P in a contracted state, the airtight surface of the pig 1 comes into contact with the inner surface of the gas pipe P, and the pig 1 in the longitudinal direction in the gas pipe P Ventilation is blocked and both sides of the pig 1 in the gas pipe P are partitioned in an airtight manner by the pig 1.

As shown in FIGS. 2 and 3, the ventilation pipe 5 is fixed to the pig 1 with an adhesive (not shown) in a through state in which the ventilation pipe 5 passes through the approximate center of the pig 1 and the tip projects from the front portion 1 f of the pig 1. ing.
Further, as shown in FIG. 1, a flexible long tube 7 that can be connected to the proximal end of the ventilation pipe 5 by a hose joint 6, and a hose reel that can be wound and unwound. 8 is provided.

An intake pipe in which the distal end of the main pipe 9 is connected to the proximal end of the tube 7 via the hose reel 8, and the proximal end of the original pipe 9 is connected to the intake port of the vacuum pump 2 via the three-way valve 4. 10 and a discharge pipe 11 connected to a discharge port of the air compressor 3.
That is, the tubular body T is constituted by the ventilation pipe 5, the tube 7, the original pipe 9, and the like, the distal end of the ventilation pipe 5 corresponds to the distal end Tf of the tubular body T, and the proximal end of the original pipe 9 is the base of the tubular body T. It corresponds to the end Tb.
Then, by operating the three-way valve 4, the intake state and the discharge state are switched.

Since the structure of the hose reel 8 for connecting and connecting the tube 7 and the original pipe 9 in a state in which the tube 7 can be wound and unwound freely is well known, a detailed description and illustration thereof will be omitted and will be briefly described. .
The hose reel 8 is configured such that a hollow shaft portion is rotatably supported by a pair of bearing portions, and the tube 7 can be wound and fed out by the shaft portion. Then, the leading end of the original pipe 9 is connected to one of the bearing portions in communication with one end of the shaft portion, and the proximal end of the tube 7 is connected to the tube wall of the hollow shaft portion, whereby the winding of the tube 7 is performed. The tube 7 and the original pipe 9 are connected in communication with each other in a state in which they can be taken out and extended.

Next, a method for exhausting residual gas in the pipe line will be described with reference to FIG.
In addition, in FIG. 4, while showing the longitudinal cross-sectional view of the gas pipe P embed | buried under the ground, the schematic structure of the pipe moving apparatus in a pipe line is shown.
Although not shown, a gas concentration meter is provided so as to measure components in the gas G sucked and released from the gas pipe P by the vacuum pump 2. As this gas concentration meter, one capable of measuring at least the concentration of the residual gas G (that is, city gas) in the gas pipe P is used.

  In the method for exhausting residual gas in the pipe according to the present invention, the pig 1 is inserted into the open end of the gas pipe P, and the residual gas in the portion closer to the closed end Pf than the pig 1 in the gas pipe P is inserted by the vacuum pump 2. By sucking and exhausting G through the tubular body T, the pig 1 is moved to the closed end Pf side in the gas pipe P, and the residual gas G in the gas pipe P is exhausted.

Hereinafter, the procedure of the residual gas exhaust method in the pipeline will be described.
As shown in FIG. 4A, first, a portion where one end Pb of the gas pipe P is buried is excavated to expose one end Pb of the gas pipe P and open the one end Pb. One end Pb of the gas pipe P is an open end Pb, and the other end is a closed end Pf.
Then, the pig 1 is inserted into the open end Pb of the gas pipe P with the front end Tf of the tubular body T facing forward.
Subsequently, the vacuum pump 2 is operated with the three-way valve 4 switched to the intake state.
Then, since the atmospheric pressure is applied to the portion closer to the opening end Pb than the pig 1 in the gas pipe P, the residual gas G in the portion closer to the closed end Pf than the pig 1 in the gas pipe P is vacuum pumped. 2, the pressure in the portion closer to the closed end Pf than the pig 1 in the gas pipe P becomes lower than the pressure in the portion closer to the opening end Pb than the pig 1 in the gas pipe P. Accordingly, the pig 1 is pushed to the closed end Pf side by the atmospheric pressure, and when the operation of the vacuum pump 2 is continued, as shown in FIG. Move towards the side.

While the vacuum pump 2 is in operation, the atmospheric pressure in the gas pipe P sucked by the vacuum pump 2 is monitored, and when the atmospheric pressure falls below a preset value, the pig 1 is closed in the gas pipe P. It is considered that Pf has been reached.
In addition, while the vacuum pump 2 is in operation, the concentration of the city gas measured by the gas concentration meter is monitored, and when the measured value is equal to or less than the set value for the closed end arrival determination set to a value close to 0, It is assumed that the residual gas G in the gas pipe P has been exhausted sufficiently.
Then, when it is considered that the pig 1 has reached the closed end Pf, the three-way valve 4 is switched to the discharge state and the air compressor 3 is operated.
Then, air A having a pressure higher than the atmospheric pressure is supplied to the closed end Pf side of the pig 1 in the gas pipe P, so that the pig 1 is pushed back to the open end Pb side. When the operation is continued, the pig 1 moves in the gas pipe P toward the opening end Pb as shown in FIG.
When the pig 1 returns to the opening end Pb of the gas pipe P, the air compressor 3 is stopped and the pig 1 is pulled out from the opening end Pb of the gas pipe P.
By the above processing, the residual gas G in the gas pipe P is exhausted and replaced with air A.

  Hereinafter, the second to fifth embodiments of the present invention will be described. However, each embodiment describes another embodiment of the process performed using the in-pipe pig moving apparatus, and the in-pipe pig movement is described. The basic configuration of the apparatus is the same as that of the first embodiment. Therefore, the description of the configuration of the in-pipe pig moving apparatus is limited to the description of the points different from the first embodiment in order to avoid redundant description, and a processing method mainly performed using the in-pipe pig moving apparatus. Will be described.

[Second Embodiment]
In this second embodiment, an in-pipe inspection method for inspecting the inside of a pipe line using an in-pipe pig moving device will be described.
As shown in FIGS. 5 and 6, in the intra-pigment pig moving apparatus of the second embodiment, at a location corresponding to the vicinity of the front portion 1 f of the pig 1 in the tubular body T (specifically, the ventilation pipe 5), When the pig 1 is inserted into the gas pipe P, the video camera 12 is held so that the inside of the gas pipe P can be photographed. Although detailed description is omitted, the video camera 12 is configured using, for example, a solid-state imaging device such as a CCD or a CMOS, and is reduced in size and weight so that the video camera 12 can be securely held in the ventilation pipe 5.
Further, a display 13 for displaying an image taken by the video camera 12 is provided.
Furthermore, a cable for transmitting information for remotely operating the video camera 12 and a cable for transmitting information captured by the video camera 12 are bundled into the pig 1 together with the ventilation pipe 5 to be connected to the video camera 12. It is connected.

Next, the in-pipe inspection method will be described with reference to FIG.
In addition, in FIG. 6, while showing the longitudinal cross-sectional view of the gas pipe P embed | buried under the ground, the schematic structure of the pipe moving apparatus in a pipe line is shown.
In the in-pipe inspection method according to the present invention, the gas pipe is held by the vacuum pump 2 in a state where the video camera 12 is held so that the inside of the gas pipe P can be photographed at a position corresponding to the vicinity of the front portion 1f of the pig 1 in the tubular body T. The gas G in the portion closer to the closed end Pf than the pig 1 in the P is sucked and exhausted through the tubular body T, or is tubular in the portion closer to the closed end Pf than the pig 1 in the pipe P by the air compressor 3. By supplying the compressed air A through the body T, the pig 1 is moved in the pipe P, and the inside of the gas pipe P is inspected by the photographing information of the video camera 12.

Hereinafter, the procedure of the in-pipe inspection method will be described.
As shown in FIG. 6, similarly to the first embodiment, first, a portion where one end Pb of the gas pipe P is embedded is excavated to expose the one end Pb of the gas pipe P, and one end Pb thereof. Open. One end Pb of the gas pipe P is an open end Pb, and the other end is a closed end Pf.
Then, the pig 1 is inserted into the open end Pb of the gas pipe P with the front end Tf of the tubular body T facing forward.
Subsequently, when the vacuum pump 2 is operated with the three-way valve 4 switched to the intake state, the pig 1 moves in the gas pipe P as shown in FIG. It moves toward the closed end Pf side.
Since the video camera 12 moves integrally with the pig 1 and an image photographed by the video camera 12 is displayed on the display 13, the gas pipe P is inspected based on the display image.

If it is determined from the display image on the display 13 that the pig 1 has reached a predetermined location (for example, the closed end Pf) in the gas pipe P, illustration is omitted, but as in the first embodiment, three-way The valve 4 is switched to the discharge state and the air compressor 3 is operated to return the pig 1 to the open end Pb of the gas pipe P, and the pig 1 is removed from the open end Pb of the gas pipe.
Thus, even when returning the pig 1 to the opening end Pb of the gas pipe P, if the video camera 12 continues to be photographed, the inspection in the gas pipe P can be performed based on the display image on the display 13. .

[Third Embodiment]
In the third embodiment, a pipe inner surface lining method for forming a lining film on the pipe inner surface using the in-pipe pig moving device will be described.
As shown in FIG. 7, in the in-pipe pig moving device of the third embodiment, when the ventilation pipe 5 is fixed to the pig 1 in a penetrating state, the amount of protrusion of the ventilation pipe 5 from the front portion 1 f of the pig 1. The tip of the ventilation pipe 5 is configured to be exposed without being buried in the lining film forming liquid 15 described later.
Furthermore, the tip portion of the ventilation pipe 5 is bent at a right angle.

Next, the pipe inner surface lining method will be described with reference to FIGS.
In addition, in FIG. 8, while showing the longitudinal cross-sectional view of the gas pipe P embed | buried under the ground, the schematic structure of the pipe moving apparatus in a pipe line is shown.
In the pipe inner surface lining method according to the present invention, the lining film forming liquid 15 is present on the moving direction side of the pig 1 in the gas pipe P, and the vacuum pump 2 closes the pipe 1 in the gas pipe P. The gas G at the end Pf side is sucked and exhausted through the tubular body T, or the compressed air A is supplied through the tubular body T to the closed end Pf side of the pig 1 in the gas pipe P by the air compressor 3. As a result, the pig 1 is moved in the gas pipe P to the side where the lining film forming liquid 15 is present, and the lining film forming liquid 15 is applied to the inner surface of the gas pipe P to thereby form the lining film 16 (see FIG. 9). Form.
In the third embodiment, a case where the lining film 16 is formed when the pig 1 is moved to the closed end Pf side in the gas pipe P will be described.

Hereinafter, the procedure of the pipe inner surface lining method will be described.
As shown in FIG. 8A, as in the first embodiment, first, a portion where one end Pb of the gas pipe P is buried is excavated to expose one end Pb of the gas pipe P. The one end Pb is opened. One end Pb of the gas pipe P is an open end Pb, and the other end is a closed end Pf.
Then, the lining film forming liquid 15 is filled into the gas pipe P from the opening end Pb. The filling amount of the lining film forming liquid 15 is set to be slightly larger than the amount necessary to form the lining film 16 with a predetermined film thickness on the inner surface of the gas pipe P from the opening end Pb to the closing end Pf. The

  The lining film forming liquid 15 is configured to be cured at room temperature using an epoxy resin, a fluororesin, or the like. Further, as shown in FIG. 9, by being pushed by the pig 1 moving in the gas pipe P, the lining film forming liquid 15 rises and comes into contact with the entire inner circumference of the gas pipe P. The viscosity of the lining film forming liquid 15 is set to be relatively high.

Then, the pig 1 is inserted into the open end Pb of the gas pipe P in a posture in which the bent portion of the distal end portion of the ventilation pipe 5 faces upward.
When the pig 1 is thus inserted into the opening end Pb of the gas pipe P, the previously filled lining film forming liquid 15 is pushed up by the pig 1 and rises, and as shown in FIG. It will be in the state which contacts all the circumferences. Even when the lining film forming liquid 15 rises in this way, the amount of protrusion of the ventilation pipe 5 from the front portion 1f of the pig 1 is large, and the tip of the ventilation pipe 5 is bent upward. 5 (ie, the tip Tf of the tubular body T) is not buried in the lining film forming liquid 15.

Subsequently, when the vacuum pump 2 is operated in a state where the three-way valve 4 is switched to the intake state, as shown in FIGS. 8A and 8B, the pig pump is operated in the same manner as in the first embodiment. 1 moves in the gas pipe P toward the closed end Pf.
Then, as shown in FIG. 9, the lining film forming liquid 15 is applied over the entire inner surface of the gas pipe P by the outer peripheral surface of the pig 1 moving in the gas pipe P, and the applied film is cured to form the lining. A film 16 is formed.
Since the length of the gas pipe P from the open end Pb to the closed end Pf is known in advance, during the operation of the vacuum pump 2, the feeding length of the tube 7 is measured, and based on the measurement information, It is determined that 1 reaches the closed end Pf in the gas pipe P.
When it is determined that the pig 1 has reached the closed end Pf of the gas pipe P, the vacuum pump 2 is stopped.

The pig 1 is left in the gas pipe P.
If a material that can be removed from the cured lining film forming liquid 15 without bonding the lining film forming liquid 15 is used as a material for forming the coating 1S of the pig 1, the pig 1 is connected to the gas pipe P. You can take it out without leaving it inside.
Incidentally, when the pig 1 is taken out from the gas pipe P, the three-way valve 4 is switched to the discharge state and the air compressor 3 is operated in the same manner as described in the first embodiment.

[Fourth Embodiment]
In the fourth embodiment, an in-pipe cleaning method for cleaning the inside of the pipe using the in-pipe pig moving device will be described.
As shown in FIG. 10, in the in-pipe pig moving device of the fourth embodiment, a ring-shaped cleaning liquid spray nozzle 17 is attached to the portion of the ventilation pipe 5 that protrudes from the rear portion of the pig 1 with an external fit. The cleaning liquid tube 18 is connected to the cleaning liquid spray nozzle 17 in communication therewith.
A plurality of ejection holes 17h are formed on the outer periphery of the cleaning liquid spray nozzle 17 so as to be distributed over the entire circumference of the cleaning liquid spray nozzle 17, and the cleaning liquid L as a cleaning agent is supplied to the cleaning liquid spray nozzle 17 through the plurality of jet holes 17h. It is comprised so that it can spread radially toward 17 radial direction outward.

Further, as shown in FIG. 11, in the pipe moving device in the pipe line, the cleaning liquid pump 20 that pumps the cleaning liquid L stored in the cleaning liquid tank 19 to the cleaning liquid tube 18 and the winding and unwinding of the cleaning liquid tube 18 are provided. A free hose reel 21 is provided.
That is, as shown in FIG. 12, with the pig 1 inserted in the gas pipe P, the cleaning liquid L in the cleaning liquid tank 19 is pumped to the cleaning liquid tube 18 by the cleaning liquid pump 20, thereby causing a plurality of jets of the cleaning liquid spray nozzle 17. The cleaning liquid L is sprayed from the holes 17h so as to hit the entire circumference of the inner surface of the gas pipe P.

Next, based on FIG. 11, the in-pipe cleaning method will be described.
In addition, in FIG. 11, while showing the longitudinal cross-sectional view of the gas pipe P embed | buried under the ground, the schematic structure of the pipe moving apparatus in a pipe line is shown.
In the in-pipe cleaning method according to the present invention, the cleaning liquid L is present on the moving direction side of the pig 1 in the gas pipe P, and the vacuum pump 2 is closer to the closed end Pf side than the pig 1 in the gas pipe P. By sucking and exhausting part of the gas G through the tubular body T, or by supplying the compressed air A through the tubular body T to the portion closer to the closed end Pf than the pig 1 in the gas pipe P by the air compressor 3, The pig 1 is moved in the gas pipe P to the side where the cleaning liquid L exists, and the gas pipe P is cleaned with the cleaning liquid L.
In the fourth embodiment, a case where the inside of the gas pipe P is cleaned when the pig 1 is moved to the opening end Pb side in the gas pipe P will be described.

Hereinafter, the procedure of the in-pipe cleaning method will be described.
As shown in FIG. 11, as in the first embodiment, first, a portion where one end Pb of the gas pipe P is buried is excavated to expose the one end Pb of the gas pipe P, and the one end Pb Open. One end Pb of the gas pipe P is an open end Pb, and the other end is a closed end Pf.
Subsequently, as in the first embodiment, the pig 1 is inserted into the open end Pb of the gas pipe P, the vacuum pump 2 is operated with the three-way valve 4 switched to the intake state, and the pig 1 is removed from the gas. The tube P is moved toward the closed end Pf side.
While the vacuum pump 2 is operating, the feeding length of the tube 7 is measured as in the third embodiment, and the pig 1 reaches the closed end Pf in the gas pipe P based on the measurement information. Judging.
When it is determined that the pig 1 has reached the closed end Pf of the gas pipe P, the three-way valve 4 is switched to the discharge state, the air compressor 3 is operated, and the cleaning liquid pump 20 is operated.
Then, as shown in FIGS. 11 and 12, the pig 1 moves in the gas pipe P toward the opening end Pb, and the cleaning liquid L flows from the plurality of ejection holes 17 h of the cleaning liquid spray nozzle 17 to the inner surface of the gas pipe P. Therefore, the inner surface of the gas pipe P is rubbed and cleaned by the surface of the pig 1 with the cleaning liquid L interposed.
When the pig 1 returns to the opening end Pb of the gas pipe P, the air compressor 3 and the cleaning liquid pump 20 are stopped, and the pig 1 is removed from the opening end Pb of the gas pipe P.

[Fifth Embodiment]
In the fifth embodiment, an in-pipe connection method for passing a linear body through a pipe using the in-pipe pig moving device will be described.
As shown in FIGS. 13 and 14, in the fifth embodiment, the in-pipe pig moving device is configured in the same manner as in the first embodiment.

Next, based on FIG.13 and FIG.14, the in-pipe passage method is demonstrated.
In addition, in FIG. 14, while showing the longitudinal cross-sectional view of the gas pipe P embed | buried under the ground, the schematic structure of the pipe moving apparatus in a pipe line is shown.
In the in-pipe connection method according to the present invention, the pig 1 is attached to the opening end of the gas pipe P in a state where the tip of the linear body 22 is fixed to a location corresponding to the vicinity of the pig 1 in the pig 1 or the tubular body T. By inserting the vacuum pump 2 and sucking and exhausting the gas G in the gas pipe P closer to the closed end Pf side than the pig 1 through the tubular body T, the pig 1 is closed in the gas pipe P. The linear body 22 is passed through the gas pipe P by moving to the Pf side.

Hereinafter, the procedure of the in-pipe connection method will be described.
As shown in FIG. 13, in this fifth embodiment, the tip of the linear body 22 is fixed by a binding band 23 at a location corresponding to the vicinity of the rear portion of the pig 1 in the tubular body T (specifically, the ventilation pipe 5). To do.
Subsequently, as shown in FIG. 14A, as in the first embodiment, first, a portion where one end Pb of the gas pipe P is embedded is excavated, and the one end Pb of the gas pipe P is changed. The one end Pb is opened by exposing. One end Pb of the gas pipe P is an open end Pb, and the other end is a closed end Pf.
Subsequently, the pig 1 is inserted into the open end Pb of the gas pipe P with the tip Tf of the tubular body T facing forward.
Subsequently, when the vacuum pump 2 is operated in a state where the three-way valve 4 is switched to the intake state, as shown in FIGS. 14 (a) and 14 (b), the same action as in the first embodiment is performed. The pig 1 moves in the gas pipe P toward the closed end Pf, and accordingly, the linear body 22 is unwound from the linear body reel 24 and passed through the gas pipe P.
While the vacuum pump 2 is operating, the feeding length of the tube 7 is measured, and it is determined that the pig 1 reaches the closed end Pf in the gas pipe P based on the measurement information.
When it is determined that the pig 1 has reached the closed end Pf of the gas pipe P, the vacuum pump 2 is stopped.
Then, as shown in FIG. 14B, the linear body 22 is passed through the gas pipe P over substantially the entire length from the open end Pb to the closed end Pf.

[Another embodiment]
Next, another embodiment will be described.
(A) In each of the first to fifth embodiments described above, the tubular body T is illustrated as being configured by the ventilation pipe 5, the tube 7 and the original pipe 9 connected in series. You may comprise with one tube which has.

(B) In each of the first to fifth embodiments described above, the pig moving means M includes the vacuum pump 2, the air compressor 3, and the three-way valve 4. However, the air compressor 3 and the three-way valve 4 are omitted. May be. In this case, when pulling out the pig 1 from the pipe P, the pig 1 is moved in the pipe P toward the opening end Pb by pulling the tubular body T.
Alternatively, the three-way valve 4 may be omitted, and the original pipe 9 may be connected to the vacuum pump 2 or the air compressor 3 by hand.

(C) In performing the in-pipe inspection method using the in-pipe pig moving device, the installation location of the video camera 12 is the location illustrated in the second embodiment, that is, the location of the pig 1 in the tubular body T. It is not limited to the location corresponding to the vicinity of the front portion 1f. For example, the location corresponding to the vicinity of the rear part of the pig 1 in the tubular body T may be used. Or you may provide directly in the front part 1f or rear part of the pig 1. FIG.

(D) In executing the pipe inner surface lining method using the pipe moving device in the pipe, in the third embodiment, the lining film 16 is moved when the pig 1 is moved to the closed end Pf side in the gas pipe P. The case of forming is illustrated.
Instead, when the compressed air A is supplied to the closed end Pf side of the pig 1 in the gas pipe P by the air compressor 3, the pig 1 is moved to the open end Pb side in the gas pipe P. Alternatively, the lining film 16 may be formed.
In this case, first, the pig 1 is moved to the closed end Pf in the gas pipe P by sucking the gas G in the portion closer to the closed end Pf than the pig 1 in the gas pipe P by the vacuum pump 2.
Subsequently, the lining film forming liquid 15 is filled in front of the pig 1 in the gas pipe P, and the pig 1 is moved to the opening end Pb side in the gas pipe P as described above. Then, the lining film forming liquid 15 is applied over the entire inner surface of the gas pipe P by the outer peripheral surface of the pig 1 moving in the gas pipe P, and the coating film is cured to form the lining film 16.

(E) In performing the in-pipe cleaning method using the in-pipe pig moving device, in the fourth embodiment, when moving the pig 1 to the open end Pb side in the gas pipe P, the gas pipe The case of cleaning the inside of P was illustrated.
Instead, the vacuum pump 2 sucks and exhausts the gas G in the portion closer to the closed end Pf than the pig 1 in the gas pipe P through the tubular body T, so that the pig 1 is closed in the gas pipe P. The gas pipe P may be cleaned when moved to the Pf side.
In this case, the cleaning liquid spray nozzle 17 is attached to the portion of the ventilation pipe 5 that protrudes from the front portion 1f of the pig 1 in an outer fitting manner.
In the fourth embodiment, the cleaning liquid L is used as the cleaning agent. However, a foam cleaning agent may be used.

(F) The form in which the pig 1 is configured so as to have elasticity and the surface is airtight is the form illustrated in the above embodiment, that is, the entire surface of the pig main body 1H formed of a sponge having elasticity. It is not limited to the form in which is covered with the non-breathable and elastic coating 1S.
For example, the coating 1S may be omitted, and only the pig body 1H made of a single foam sponge may be used. In this case, when the pig 1 is inserted into the gas pipe P in a contracted state, bubbles on the outer peripheral portion are crushed so that both sides of the pig 1 in the gas pipe P can be partitioned in an airtight manner.
Further, in the case where the entire surface of the pig body 1H is covered with the non-breathable and elastic coating 1S, the pig body 1H is constituted by a single foam sponge as in the above embodiment, and bubbles are connected. You may form with the open-cell sponge.

(G) The specific example of the pipe line is not limited to the gas pipe P illustrated in the above embodiment, and various pipes can be applied.

  As described above, it is possible to provide an in-pipe pig moving apparatus capable of executing a predetermined process with a simple preparation operation. In addition, a method for exhausting residual gas in pipelines, an in-pipe inspection method, a pipeline inner surface lining method, a pipeline cleaning method, and a pipeline connection method capable of performing each processing with simple preparation work are provided. Can do.

1 pig 1f front 2 vacuum pump (suction means)
3 Air compressor (Compressed air supply means)
4 Three-way valve (switching means)
12 Video camera (camera)
15 Lining film forming liquid 16 Lining film 22 Linear body A Compressed air G Residual gas, gas L Cleaning liquid (cleaning agent)
M Pig moving means P Gas pipe (pipe)
Pb Open end Pf Closed end T Tubular body Tf Tip

Claims (7)

A pig having elasticity and at least a surface being hermetically sealed, and being inserted in a contracted state into a conduit closed at one end;
An in-pipe pig moving device comprising a pig moving means for moving the pig in the pipe,
When the pig is inserted into the duct, the distal end of the tubular body is fixed to the pig in an inserted state where the distal end is exposed from the front portion facing the closed end of the duct in the pig,
In-pipe pig movement, wherein the pig moving means includes suction means for sucking the gas at the closed end side of the pig inserted into the pipe line out of the pipe through the tubular body. apparatus.   The pig moving means sucks gas through the tubular body by the compressed air supply means for supplying compressed air through the tubular body to the closed end side of the pig inserted into the conduit, and the suction means. The in-pipe pig moving device according to claim 1, further comprising switching means that can be switched between a state in which the compressed air is supplied and a state in which compressed air is supplied through the tubular body by the compressed air supply means. A pipe residual gas exhaust method for exhausting residual gas in a pipe using the pipe moving device in pipe according to claim 1 or 2,
By inserting the pig into the open end of the pipe and sucking and exhausting the residual gas in the portion closer to the closed end than the pig in the pipe through the tubular body by the suction means. A method for exhausting residual gas in a pipe by moving the pig to the closed end side in the pipe and exhausting residual gas in the pipe. An in-pipe inspection method for inspecting the inside of a pipe line using the in-pipe pig moving device according to claim 1,
With the camera held in a position corresponding to the vicinity of the pig in the pig or the tubular body so that the inside of the pipe can be photographed, the suction means is closer to the closed end than the pig in the pipe. A portion of the gas is sucked and exhausted through the tubular body, or is provided with compressed air supply means, and the compressed air supply means passes the tubular body through the closed end side portion of the pipe in the pipeline. An in-pipe inspection method in which the pig is moved in the pipe by supplying compressed air, and the inside of the pipe is inspected based on photographing information of the camera. A pipeline inner surface lining method for forming a lining film on the pipeline inner surface using the in-pipe pig moving device according to claim 1 or 2,
In the state where the liquid for forming the lining film is present on the moving direction side of the pig in the pipe line, the tubular body causes the gas in the portion closer to the closed end than the pig in the pipe line to be drawn by the suction means. Or by supplying compressed air through the tubular body to the portion closer to the closed end than the pig in the pipe by the compressed air supply means. A method of inner lining a pipe, wherein the lining film is formed by applying the lining film forming liquid to the inner surface of the pipe by moving the pig to the lining film forming liquid existing side in the pipe. . An in-pipe cleaning method for cleaning the inside of a pipe line using the in-pipe pig moving device according to claim 1 or 2,
With the detergent present on the moving direction side of the pig in the pipeline, the suction means sucks the gas in the portion closer to the closed end than the pig in the pipeline through the tubular body. Or by supplying compressed air through the tubular body to the closed end side of the pig in the pipeline by the compressed air supply means. In-pipe cleaning method for cleaning the inside of the pipeline with a cleaning agent by moving the cleaning agent to the side where the cleaning agent is present in the pipeline. An in-pipe connection method for passing a linear body into a pipe using the in-pipe pig moving device according to claim 1,
With the tip of the linear body fixed at a position corresponding to the vicinity of the pig in the pig or the tubular body, the pig is inserted into the open end of the conduit, and the pipe is By sucking and exhausting the gas in the closed end side of the pig in the passage through the tubular body, the pig is moved to the closed end side in the pipe, and the pipe is moved into the pipe. In-pipe connection method for passing the linear body.

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