JPH1024266A - Method for regenerating and repairing existing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for regenerating and repairing an existing piping capable of surely executing resin lining up to a target position over the entire length of a pipe. SOLUTION: A lining pig 3, a lining resin A, a resin transporting pig 4, a liquid absorbent 5 and a liquid shielding pig 6 are first introduced into the pipe from the above-the-ground aperture 14 of the supply pipe 7 in a first stage. Next, the entire amt. of the plug-like lining resin A is forcibly fed into the branching position 2 on a main branch pipe 1 side by injecting the prescribed amt. of the fluid flow into the pipe. Sound waves of about the audible frequencies are thereafter emitted from the above-the-ground aperture 14 of the supply pipe to the fluid flow B in the pipe and the reflected waves from the water shielding pig 6 are received, by which the distance from the above-the-ground aperture 14 of the supply pipe toward the water shielding pig 6 is measured. The result of the measurement is compared with the desired distance at which the water shielding pig 6 arrives at the pipe. When judgment is made that the actual position of the water shielding pig 6 does not arrive at the desired position, the liquid flow B is increased and is injected again into the pipe in such a manner that the water shielding pig 6 is capable of arriving at the position where the water shielding pig 6 is required to arrive, by which the plug-like lining resin A is forcibly fed to the branching position 2 on the main branch pipe 1 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rehabilitation repair method for an existing pipe such as a gas pipe for maintenance.

[0002]

2. Description of the Related Art Various techniques have been developed and proposed for rehabilitation and repair by non-excavation while existing pipes are laid. For example, recently, a resin lining method for an existing pipeline using a non-drilling technique has been used. At present, this method has already been recognized as an effective repair technique for aging existing pipelines.

[0003]

2. Description of the Related Art As a lining method as described above, the present applicant has proposed a rehabilitation repair method as described in Japanese Patent Application Laid-Open No. 4-114773.

In this rehabilitation repair method, a supply pipe branched from a main pipe laid under a road toward a demand destination is targeted for repair. The meter provided at the end side of the supply pipe is removed and used as a ground opening. From this ground opening, an amount of liquid resin necessary for lining the inside of the supply pipe is introduced into the pipe in the first step in a plug shape. Then, the entire amount of the resin plug is pressure-fed to the branch position on the main pipe side by the liquid flow pressed into the pipe, and in the second step, the liquid flow is suctioned and discharged by suction means connected to the ground opening, and the suction is performed. The resin is applied to the inner surface of the pipe by the flow of the resin plug pulled back to the end side of the supply pipe by force to form a required lining film.

[0005] In the above-mentioned construction method, for example, as shown in FIG.
Lining resin A, resin transport pig 4, liquid absorbing agent 5
Then, the liquid shielding pig 6 is introduced into the pipe, and then a predetermined amount of the liquid flow B is injected into the pipe, whereby the entire amount of the resin plug A is pumped to the branch position 2 on the main pipe 1 side.

[0006]

However, the above-mentioned rehabilitation and repair method for existing pipelines has the following problems.

That is, the required amount of the liquid B for pumping to be injected into the pipe in the first step is calculated in consideration of the length and diameter of the supply pipe 7 and the volume of the lining resin A. Here, the length of the supply pipe 7 is from the above-ground opening 14 of the supply pipe to the branch position 2 on the main pipe side,
It is measured in advance by a sonic length measuring machine. However, since it is not possible to know in advance how much a pipe diameter (such as a pipe diameter error) such as a bend, an elbow, or a socket is present in a pipe for resin lining, there is no bend in the pipe. It is common to make the assumption that the pipes have the same diameter over the entire length of the pipe without making any changes. As shown in FIG. 6, when the liquid calculated on the basis of such an assumption is injected into a conduit having an enlarged portion such as an elbow 8a or a socket 8b, the liquid is affected by these enlarged portions. The amount of the liquid B for pumping becomes insufficient. The plug-like resin A injected into the supply pipe 7 due to the shortage of the liquid amount for pumping
Cannot reach the branch position (target position) on the main pipe side, and resin lining to the target position cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a method for rehabilitating and repairing an existing pipe in which resin lining can be reliably performed to a target position.

[0009]

In order to achieve the above object, the present invention provides a supply pipe branched from the main pipe for rehabilitation and repair, and supplies a liquid resin necessary for lining the inner surface of the supply pipe with: In the first step, the resin pipe is introduced into the pipe from the opening above the supply pipe in the form of a plug, and the entire amount of the resin plug is transferred to the branch position on the main pipe side by the liquid flow press-fitted from the rear. The suction means connected to the opening sucks and discharges the liquid flow in the pipe, and the suction force causes the resin plug to be drawn back to the opening above the supply pipe to apply resin to the pipe inner surface to form a lining film. In the pipe rehabilitation repair method, in the first step, a lining pig, a lining resin, a resin transport pig, a liquid-absorbing agent, and a liquid-shielding pig are introduced into the pipe from the opening above the supply pipe. Predetermined By injecting the liquid flow into the pipe, the entire amount of the resin plug is pressure-fed to the branch position on the main pipe side, and then sound waves of an audible frequency are emitted from the above-ground opening of the supply pipe into the liquid flow in the pipe, thereby blocking the water. By receiving the reflected waves from the pig, the distance from the ground opening of the supply pipe to the impervious pig is measured, and the measurement result is compared with the expected distance of the impervious pig in the pipe. When it is determined that the expected position has not been reached, the liquid flow is increased and re-injected so that the impermeable pig can reach the expected position.

[0010]

According to the present invention configured as described above, the first
In the process, first, a lining pig, a lining resin, a resin transport pig, a liquid absorbing agent, and a liquid shielding pig are introduced into the pipe from the above-ground opening of the supply pipe. Next, by injecting a predetermined amount of liquid flow into the pipe, the entire amount of the resin plug is pumped to the branch position on the main pipe side. After that, a sound wave of an audible frequency is emitted from the ground opening of the supply pipe to the liquid flow in the pipe, and the reflected wave from the impermeable pig is received, so that the distance from the ground opening of the supply pipe to the impermeable pig is reduced. Measure. The measured result is compared with the expected distance of the impervious pig in the pipe, and if it is determined that the actual position of the impervious pig has not reached the expected position, the liquid flow is adjusted so that the impervious pig can reach the expected arrival position. Increase and reinject.

By making the water-blocking pig surely reach the expected position in the pipe, it becomes possible to reliably feed the resin plug introduced into the supply pipe to the branch position on the main pipe side. Therefore, the required resin lining can be formed over the entire length of the supply pipe.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 show a first step of the rehabilitation repair method of the present invention. As shown in FIG. 1, in the first step, as a means for injecting a liquid flow introduced from the above-mentioned opening of the supply pipe, a liquid tank 9, a liquid sending pump 10,
And a control device 20 for controlling the liquid flow sent from the pump, which are connected in series to the pipeline via hoses 12, 13 and 15.

In the first step, first, the lining pig 3 is introduced into the supply pipe 7, and
The resin A is injected into the supply pipe through the opening 14 above the supply pipe by the hydraulic pressure obtained by the operation of the liquid supply pump 10. Thereafter, the resin transport pig 4, the liquid absorbing agent 5, and the liquid shielding pig 6 are introduced into the pipe using the pig cassette 28 at the same liquid pressure. Next, by continuously operating the liquid feed pump 10, the liquid B is sucked and pressurized from the liquid tank 9, and injected into the supply pipe 7 through the liquid flow control device 20, so that the resin A It is pumped to the branch position 2 on the side of the branch pipe 1.

When the supply pipe 7 includes enlarged portions such as the elbow 8a and the socket 8b in the middle of the supply pipe 7, the amount of the pressure-feeding liquid B is insufficient due to the influence of these enlarged portions.
The plug-shaped resin A injected into the supply pipe 7 cannot reach the branch position (target position) 2 on the main pipe 1 side due to the shortage of the liquid amount for pumping.

Next, as shown in FIG. 2, a transmitter 21 and a receiver 22 are mounted on the ground opening 14 of the supply pipe. Using the transmitter 21, sound waves having an audible frequency are emitted from the ground opening 14 of the supply pipe to the liquid flow B in the pipe. Further, the reflected wave from the impermeable pig 6 is received using the wave receiver 22.
In this manner, the distance from the above-ground opening 14 of the supply pipe to the impermeable pig 6 can be measured. Measured water impregnation pig 6
When it is determined that the actual position of the impervious pig 6 has not reached the expected position, the liquid flow B reaches the position where the impervious pig 6 should reach, as shown in FIG. The resin plug A is fed to the branch position 2 on the main pipe side by increasing the pressure and re-injecting.

FIG. 4 shows a second step (suction lining) of the rehabilitation repair method. As shown in FIG. 4, a pig stopper 18, a liquid recovery tank 17, and a suction pump 16 are connected to the pipe side in a series manner. Suction pump 1
The liquid flow B in the pipe is sucked and discharged by the operation of 6, and the resin is applied to the pipe inner surface by the flow of the resin plug A drawn back to the above-mentioned opening 14 side of the supply pipe by the suction force to form a lining film. At this time, the lining pig 3 makes the thickness of the lining film applied on the inner surface of the tube uniform.

In FIG. 4, reference numeral 19 denotes a resin separating means provided in the liquid recovery tank 17. A small amount of resin mixed in the liquid to be recovered is separated by the resin separating means 19.

As described above, in the first step, the distance from the above-mentioned opening 14 of the supply pipe to the impermeable pig 6 is measured, and it is determined that the actual position of the impermeable pig 6 has not reached the expected position. Then, the resin plug A can be pressure-fed to the branch position 2 on the main pipe side by increasing the liquid flow B to a position where the impermeable pig 6 should reach and re-injecting the same. Therefore, the required resin lining can be reliably formed over the entire length of the supply pipe 7.

[0019]

According to the present invention, after injecting a liquid stream into a tube,
Measures the distance from the above-ground opening of the supply pipe to the impermeable pig by emitting sound waves of audible frequency to the liquid flow in the pipe from the above-ground opening of the supply pipe and receiving the reflected waves from the impermeable pig inside the pipe. I do. The measured result is compared with the expected distance of the impervious pig inside the pipe, and if it is determined that the actual position of the impervious pig has not reached the expected position, the liquid flow is adjusted so that the impervious pig can reach the position to be reached. And then re-inject the resin plug to feed it to the branch position on the main pipe side. Therefore, the required resin lining can be reliably formed over the entire length of the supply pipe.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first step of an existing pipe rehabilitation repair method of the present invention.

FIG. 2 is an explanatory view showing a first step of an existing pipe rehabilitation repair method of the present invention.

FIG. 3 is an explanatory view showing a first step of the existing pipe rehabilitation repair method of the present invention.

FIG. 4 is an explanatory view showing a second step of the existing pipe rehabilitation repair method of the present invention.

FIG. 5 is an explanatory view showing a first step of a conventional existing pipe rehabilitation repair method.

FIG. 6 is an explanatory view showing a first step of a conventional existing pipe rehabilitation repair method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main pipe 2 Branch position 3 Lining pig 4 Resin carrying pig 5 Liquid absorbing agent 6 Liquid shielding pig 7 Supply pipe 8a Elbow 8b Socket 9 Liquid tank 10 Liquid feed pump 11 Resin injection device 12 Hose 13 Hose 14 Supply pipe ground opening 15 Hose 16 Suction pump 17 Liquid recovery tank 18 Pig stop device 19 Resin separation means 20 Liquid flow control device 21 Transmitter 22 Receiver 28 Pig cassette A Lining resin B Liquid flow for pressure feeding

Claims (1)

[Claims] A supply pipe branched from the main pipe is subjected to rehabilitation repair, and a liquid resin necessary for lining the inner surface of the supply pipe is plugged into a pipe from a ground opening of the supply pipe in a first step. And the entire amount of the resin plug is transferred to the branch position on the main pipe side by the liquid flow press-fitted from the rear.
In the process, the liquid flow in the pipe is sucked and discharged by suction means connected to the above-mentioned opening of the supply pipe, and the resin is applied to the inner surface of the pipe by the flow of the resin plug pulled back to the above-mentioned opening of the supply pipe by the suction force. In the rehabilitation repair method of the existing pipeline for forming the lining film, in the first step, the lining pig, the lining resin, the resin transport pig, the liquid absorbing agent, and the liquid shielding pig are formed from the above-mentioned opening of the supply pipe. The entire amount of the resin plug is pumped to the branch position on the main pipe side by injecting a predetermined amount of liquid flow into the pipe, and then a sound wave having an audio frequency of about audible frequency is supplied from the ground opening of the supply pipe. By launching into the liquid flow and receiving the reflected waves from the impermeable pig, the distance from the above-ground opening of the supply pipe to the impermeable pig is measured, and the measurement result is compared with the expected distance of the impermeable pig inside the pipe. Of the impermeable pig A rehabilitation repair method for an existing pipeline, characterized in that when it is determined that the actual position has not reached the expected position, the liquid flow is increased and re-injected so that the impermeable pig can reach the expected position.