JPH0751623A - Method for repairing lining of inner pipe surface - Google Patents

Abstract

PURPOSE:To line a leak without closing it by another processing by mixing a filamentous flake into an incompressible liq. and closing a leak, if any, with the filamentous flake to apply a resin lining. CONSTITUTION:A necessary amt. of resin is introduced in the form of plug into a feed pipe 2 branched from a duct 1 from the terminal opening of the pipe 2 in the first stage to line the pipe 2 when the lining of the inner pipe surface is repaired, and the total amt. of the plug A is transferred to the branch position on the duct 1 side with a incompressible liq. The plug A is then returned to the terminal side of the pipe 2 by sucking the liq. in the second stage, and the inner surface of the pipe 2 is lined. A filamentary flake F is mixed into the liq. to close the leak such as a corrosion hole, if any, in the section to be repaired, and the leak is lined with the resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to a supply pipe that is branched from a conduit laid under a road, such as a gas pipe, and draws gas to a demand destination. The present invention relates to a pipe inner surface lining repair method in which a liquid resin is transferred from an end opening by a non-compressible liquid flow for lining, and measures are taken against leakage such as corrosion holes.

[0002]

2. Description of the Related Art For repairing the above-mentioned supply pipe,
A repairing method in which a liquid resin is introduced into the pipe to apply a lining has been conventionally known. As a construction method, if a resin injection port is opened at one end of the supply pipe to be constructed and a surplus resin recovery port is opened at the other end, the supply pipe will be dug up by digging up the branch part on the conduit side laid under the road. It is necessary to cut and open the connection point with the road. Therefore, the road traffic is cut off to excavate the road and cut off the branching part, and after repairing, the pipe connection and the excavation hole backfilling are required. Since post work is also required, a great deal of labor, time, and
There is a problem that it costs money.

[0003] Therefore, conventionally, as a countermeasure for solving such a problem, a non-excavation method is employed in which the inner wall of the supply pipe can be lined without dug up, cut and open the branch portion of the conduit laid under the road. As a repairing construction method, the present applicant has previously proposed the repairing construction method described in JP-A-4-114773.

In this prior art, an opening as a resin injection port is provided at the end side of a supply pipe branched from a conduit,
From this opening, in the first step, the amount of resin necessary for lining the inside of the pipe is introduced in the form of a plug, and the entire amount of the resin is once transferred to the branch position on the conduit side by air pressure from the rear,
In the second step, the introduced resin plug is basically repaired by applying it to the inner surface of the pipe while pulling it back by suction from the end side of the supply pipe and applying the lining.

According to such a repairing method, it is not necessary for the conduit side laid under the road to dig up the conduit to cut and open the connection point, thereby eliminating the above-mentioned problems associated with road excavation. The advantage is that repair work can be done efficiently. However, air has compressibility, and when the resin plug is transferred using air pressure, if there is a moving condition in the pipeline, for example, if there is a narrow portion or a wide portion in the pipeline inner diameter, the moving condition may change. The air pressure acting on the rear part of the resin plug causes a pressure change due to the volume change accompanying the compression of air, which causes a phenomenon that the head of the resin plug inadvertently ejects forward during transfer, There arises a problem that the resin jetted out in front of the resin flows into the conduit when reaching the branch position on the conduit side.

Therefore, as the resin transfer means, instead of air pressure, a hydraulic flow using water which is an incompressible liquid as seen in the prior art described in Japanese Patent Laid-Open No. 61-181574 is used. Then, a method of transferring the resin is considered.

[0007]

By the way, in the conventional repairing method utilizing the hydraulic flow, when there is a leakage spot such as a corrosion hole in the supply pipe of the repair target section, the hydraulic flow is generated from the corrosion hole. In the first step, the resin plug cannot be properly transferred to the branch position with the conduit, and leaks and penetrates into the ground, and in some cases the corrosion hole becomes large, and the second In the process, the lining coating film is not properly formed with the resin.

For this reason, it is necessary to close the leakage points such as corrosion holes prior to the lining repair work with the resin, which requires a long repair work time, resulting in an increase in construction cost.

According to the present invention, in a repairing method adopting a method of transferring a resin by utilizing a hydraulic pressure flow, the hydraulic pressure flow is made to have a function of closing leakage points such as corrosion holes so that resin lining can be performed. Thus, it is an object of the present invention to provide a pipe inner surface lining repairing method capable of performing a lining work without blocking a leak site such as a corrosion hole in another process.

[0010]

In order to achieve this object, according to the present invention, a supply pipe branched from a conduit is repaired, and a resin in an amount necessary for lining the inside of the supply pipe is used as a first object. In the step, the plug is introduced into the tube from the end opening of the supply pipe, and the entire amount of the resin plug is transferred to the branch position on the conduit side by the incompressible liquid flow from the rear side, and the resin plug is removed in the second step. Applying a lining to the inner surface of the pipe while drawing it back toward the distal end of the supply pipe by suction of a compressible liquid flow.In the pipe inner surface lining repair method, the filamentous flakes are mixed with the incompressible liquid, and the repair target section When there is a leaking part such as a corrosion hole in the supply pipe of No. 3, the liner is closed by thread-like flakes and is subjected to resin lining.

[0011]

According to the present invention as described above, when the supply pipe is repaired, when the resin is transferred by the hydraulic pressure flow, the thread-like flakes are mixed in the hydraulic pressure flow to prevent leakage of corrosion holes or the like in the supply pipe. Even if there is a spot, it is closed with thread-like flakes to reduce leakage of hydraulic flow,
In the process, the resin plug is surely transferred to the branch position with the conduit. Further, in the second step, the formation of the lining coating film with the resin is properly performed.

Further, in this case, since the repair work can be performed only by the first and second steps without blocking the leak location such as the corrosion hole in another step, the working time and the working cost are reduced, and the repair is performed. Construction costs can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first step of a pipe inner surface lining repairing method to which the present invention is applied, and FIG. 2 is an explanatory view when a supply pipe has a corrosion hole. In these FIGS. 1 and 2, 1 is a conduit line laid under the road, 2 is a supply pipe branched from this conduit line 1 and drawn into the residential land, and at the end side of this supply pipe 2, A meter stand 2a extending toward the ground is connected. A gas meter (not shown), which is a demand destination, is usually attached to the upper end of the meter stand tube 2a, and the opening is made into the resin and water pressure introduction port by removing the meter during the main repair.

In the first step shown in FIG. 1, from the upper end opening of the meter stand tube 2a, the lining pig 3 is placed in the inside of the tube, and the repairing resin A is in the form of a plug in the liquid state at the subsequent stage. be introduced. The introduction of the resin plug A is performed by connecting, for example, a manual type resin injection tank (not shown) to the upper end opening of the meter stand tube 2a and introducing the required amount of the resin A. For, the necessary amount calculated from the relational conditions such as the pipe length of the supply pipe 2 to be repaired, the pipe inner diameter, and the thickness of the coating film to be formed is introduced.

After the introduction of the resin plug A, the spherical resin conveying pig 4 is moved to the upper end opening of the meter stand pipe 2a by pushing the whole amount of the resin plug A introduced into the pipe without leaving the resin plug A.
Then, the water absorbing material 5 having a required amount of water absorbing ability and the spherical water blocking pig 6 are sequentially introduced. After that, the meter stand 2
The water tank 7, the water pump 8, the water pressure flow control device 9, and the tip of a water supply hose 11 extending from the filamentous flake storage tank 10 are connected to the upper end opening of a in order.

The water pressure flow control device 9 supplies a metered water flow having a constant pressure to the inside of the supply pipe 2 from the meter stand pipe 2a through the water supply hose 11, and automatically supplies water when a constant amount is supplied. Has the function of stopping. Further, in the filamentous flake accommodating tank 10, the filamentous flakes F having a length of about 3 to 8 mm have an almost constant mixing ratio depending on the amount of water sent from the water pump 8 via the hydraulic pressure control device 9. It is housed only in the container and is agitated substantially uniformly by the agitator 10a.

In the first step, the water pump 8 is driven so that the water in the water tank 7 is sent to the filamentous flake accommodating tank 10 through the water pressure flow control device 9, and the filamentous flakes F are there.
Is mixed with the filamentous flake mixed water W, and the water pressure of the filamentous flake mixed water W acts on the rear side of the water blocking pig 6, the water absorbing material 5, and the resin conveying pig 4 via the water supply hose 11, and the water pressure causes the resin plug A The resin plug A moves in the pipe of the supply pipe 2 toward the conduit passage 1 side due to the pressure difference generated in the pipe passages before and after the leading lining pig 3 on the conduit passage 1 side. The movement of the resin plug A is stopped by stopping the water supply when reaching the branch position.

While the resin plug A is moving, a water impinging pig 6, a water absorbing material 5, and a resin carrying pig 4 are interposed between the water pressure flow from the rear and the resin plug A, and Even if the water leaks from the peripheral gap of the water blocking pig 6 due to the pressure of the flow and flows out to the front, the water is absorbed by the water absorbing material 5, and the water blocking function becomes two steps. Contamination is completely avoided. Further, as shown in FIG. 2, if there is a pinhole-shaped corrosion hole 12 in the supply pipe 2 where the filamentous flake-mixed water W moves or stays and there is a place where the water leaks, the water will be the corrosion hole 12 At the same time, the filamentous flakes F are leaked from the core, and the filamentous flakes F are concentrated on the portion, and the corrosion holes 12 are closed. At that time, the amount of water leaking out of the pipe is very small.

Further, the moving distance of the resin plug A is such that the lining pig 3 introduced into the pipe line → the length of the pipe line extending from the upper end opening of the meter stand pipe 2a to the branch position on the side of the pipe 1 →
Resin plug A → Resin transport pig 4 → Water absorbing material 5 → Water blocking pig 6
Is calculated by calculating the amount of the filamentous flake mixed water W to be sent into the pipeline from the internal volume based on the residual pipeline length obtained by subtracting the length of the pipeline from the total length of the pipeline. If the water supply is stopped at the time when the mixed water W is sent out, the leading lining pig 3 of the resin plug A becomes the conduit line 1
The movement is stopped at the distance when the side branch position is reached.

When the first step is completed, the second step shown in FIGS. 3 and 4 is subsequently performed. In this second step,
A recovery tank 14 is connected to the upper end opening of the meter stand tube 2a via a connecting cylinder 13, and a vacuum pump 16 is connected to this via a hose 15. A pig stop 17 for collecting the water blocking pig 6, the water absorbing material 5, the resin carrying pig 4, and the lining pig 3 between the connecting cylinder 13 and the collecting tank 14.
Is intervening.

In the second step, the filamentous flake-mixed water W (supply tube 2, meter stand tube 2a) sent in the first step by the suction action of the vacuum pump 16 is actuated.
(Retained in the inside) is sequentially absorbed and collected in the tank 14, so that the resin plug A sent to the branch end on the conduit 1 side is pulled back in the opposite direction to the first step. And move. In this returning step, the lining pig 3 follows the tail of the resin plug A, and in the step of being pulled back, a resin coating film of a required film thickness is formed on the inner walls of the supply pipe 2 and the meter stand pipe 2a by the lining pig 3. By pulling back the plug A, the lining L is applied to the entire inside of the supply pipe 2 including the meter stand pipe 2a.

In the above-mentioned second step, the water-impermeable pig 6 wipes the water on the inner wall of the pipe prior to the movement of the retracted resin plug A, and then the water-absorbing material 5 further removes the water adhering to the inner wall of the pipe. By absorbing and removing water, water bubbles do not occur in the coating film formed by the subsequent resin plug A, and proper lining work is achieved.

Further, even if there is a corrosion hole 12 in the supply pipe 2 through which the filamentous flake-mixed water W moves or stays, this corrosion hole 12 is partly caused by a slight leakage of water from the hole 12 to the outside of the pipe. Since the thread-like flakes F are concentratedly left on the surface to make the corrosion holes 12 closed as shown in FIG. 2, the coating film formed by the resin plug A is leveled, and as shown in FIG. Appropriate lining L construction is performed.

In the above embodiment, the case where incompressible water was used as the liquid for transferring the resin plug introduced into the supply pipe and sucking and moving it was explained, but other water may be used in place of this water. The same operation can be performed using an incompressible liquid.

[0025]

As described above, according to the pipe inner surface lining repair method of the present invention, when the resin is transferred by the hydraulic flow in the first step of the repair work, the filamentous flakes are mixed in the hydraulic flow. Therefore, even if there is a leak location such as a corrosion hole in the supply pipe, it is closed by thread-like flakes with a slight leak of hydraulic flow to the outside of the pipe, and in the first step, the resin plug is not connected to the conduit. Transfer to the branch position to the proper position. Further, in the second step, it is possible to properly form the lining coating film with the resin.

Further, in this case, since the repair work can be carried out only by the first and second steps without blocking the leaked portion such as the corrosion hole in another step, the working time, labor and working cost are reduced. Therefore, it is possible to significantly reduce the cost of repair work.

[Brief description of drawings]

FIG. 1 is a first pipe inner surface lining repair method according to the present invention.
It is explanatory drawing which shows a process.

FIG. 2 is an explanatory diagram in the case where the supply pipe into which the hydraulic flow is introduced has a corrosion hole.

FIG. 3 is a second pipe inner surface lining repairing method according to the present invention.
It is explanatory drawing which shows a process.

FIG. 4 is an explanatory diagram of a resin-lined state of a portion where the supply pipe has a corrosion hole.

[Explanation of symbols]

 1 Conduit 2 Supply Pipe 2a Meter Standing Pipe 3 Lining Pig 4 Resin Conveying Pig 5 Water Supply Material 6 Water Blocking Pig 7 Water Tank 8 Water Pump 8 Water Pressure Flow Control Device 10 Filament Flake Storage Tank 10a Stirrer 11 Water Supply Hose 12 Corrosion Hole 13 Connection Cylinder 14 Recovery Tank 15 Hose 16 Vacuum Pump 17 Pig Stop A Resin Plug F Thread Flake W Thread Flake Mixed Water L Lining

Claims (1)

[Claims] 1. A supply pipe branched from a conduit is repaired, and an amount of resin necessary for lining the inside of the supply pipe is introduced into the pipe from a terminal opening of the supply pipe in the first step. Then, the whole amount of the resin plug is transferred to the branch position on the conduit side by the incompressible liquid flow from the rear side, and the resin plug is pulled back to the end side of the supply pipe by suction of the incompressible liquid flow in the second step. While coating the inner surface of the pipe and lining it, in the pipe inner surface lining repair method, when filamentous flakes are mixed in the above incompressible liquid and there is a leakage site such as a corrosion hole in the supply pipe in the repair target section The pipe inner surface lining repairing method is characterized in that this is closed with thread-like flakes and is subjected to resin lining.