JP2003010779A - In-pipe lining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform in-pipe lining from an opening part of an existing pipe to a desired position in the middle of the existing pipe even when there is no place of checking any overflow of a non-cured resin. SOLUTION: In an in-pipe lining method in which the non-cured resin 2 is filled in the pipe from the opening part 1 of the existing pipe C and applied to an inner surface of the pipe by pigs P1 and P2, a plurality of pigs are inserted from the opening part to fill the non-cured resin between the pigs, a distance measurement instrument 7 which receives the reflected acoustic wave transmitted in the pipe and measures the distance along the existing pipe from the transmission position of the acoustic wave to the reflection position is connected to the existing pipe on the downstream side in the pig moving direction from the opening part. The plurality of pigs are moved while monitoring the position of the pigs moving in the existing pipe based on the measurement result of the distance R3 along the existing pipe to the pigs from the transmission position of the acoustic wave by the distance measurement instrument receiving the reflected wave of the acoustic wave from the pig side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fills an uncured resin for lining from the opening of an existing pipe into a pipe, and applies the uncured resin to the inner surface of the pipe with a lining pig that moves in the existing pipe. And a lining layer obtained by curing the applied uncured resin.

[0002]

2. Description of the Related Art The above-mentioned pipe lining method is shown in FIG.
As shown in, a gas conduit (an example of an existing pipe) branched from the main branch pipe B for city gas supply buried under the road A
C is raised to the ground side in the site E on the user side beyond the public-private boundary line D, and the gas meter H and the meter gas stopper (cock) M are connected to the exposed pipe portion G exposed on the ground. In such a case, it is used to line the inside of the pipe from the opening 1 of the buried pipe portion F to a desired position in front of the meter gas plug M so that the uncured resin for lining does not enter the meter gas plug M. .

A conventional pipe lining method will be described with reference to FIG. As shown in FIG. 8 (a), an opening 1 is provided in the pit 4 excavated on the side of the road A by exposing the middle of the buried pipe portion F, and the opening 1 has a cylindrical work jig 5
And the uncured resin 2 for lining is connected to the inside of the pipe, and the uncured resin 2 is pushed toward the meter gas plug M while facing the end of the gas conduit C, that is, the end of the exposed pipe portion G. For moving lining Pig P1
Is inserted.

Further, in order to prevent the uncured resin 2 from adhering to the gas plug closure M1 mounted on the meter gas plug M, the gas plug closure M1 is extracted and replaced with the gas plug closure M1.
The lining closure 9 is attached, and the gas meter H connected to the downstream side of the meter gas plug M is removed.

As shown in FIG. 9, the lining closing member 9 prevents the uncured resin 2 from entering the exposed pipe portion G on the downstream side of the gas plug closing member M1 and the pig P.
A flow path 10 is formed to guide the uncured resin 2 pushed up by 1 so as to be pushed out of the tube.

Next, as shown in FIG. 8B, the pressurized air supply hose 11 is connected to the working jig 5, and the pig P1 is connected.
Is moved by the air pressure of pressurized air to push the uncured resin 2 toward the meter gas plug M, and as shown in FIG. 9, the uncured resin 2 is discharged from the flow passage 10 formed in the lining closure 9. When it is confirmed that the pig P1 has overflowed, it is judged that the pig P1 has moved to a position before the meter gas stopper M, and the pig P1
Stop the movement of 1 and pull out the lining closure 9,
Insert the leveling lining pig P2 into the tube.

Next, as shown in FIG. 8C, the gas stopper M1 is attached to the meter gas stopper M, and the pressurized air supply hose 11 removed from the working jig 5 is connected to the gas meter H. Connected to the exposed pipe portion G at some position, and connected the U-shaped pipe 12 to the working jig 5, and the pressurized air supply hose 1
Two pigs P1, P by the air pressure of the pressurized air supplied from 1.
2 is moved together with the remaining uncured resin 2 toward the opening 1 side, and is recovered in the recovery container 13 through the work jig 5 and the U-shaped tube 12, and the uncured resin 2 applied is cured. A layer lines the interior of the tube between the opening 1 and the meter gas tap M.

[0008]

In the above conventional pipe lining method, the opening 1 provided in the middle of the gas conduit C is used.
In order to line the inside of the pipe from the pipe to the desired position on the pipe end side, a portion such as the meter gas plug M where overflow of the uncured resin 2 can be confirmed is required near the desired position, and near the desired position. If there is no place where the overflow of the uncured resin 2 can be confirmed, there is a drawback that the inside of the pipe from the opening 1 to the desired position cannot be lined.

Further, even if the meter gas plug M is provided as a place where the overflow of the uncured resin 2 can be confirmed, it is necessary to remove the gas plug closure M1 from the meter gas plug M and mount the lining closure 9 thereon. Since there is a meter gas tap M
If there is an obstacle in the direction of extracting the gas plug closure M1 and the gas plug closure M1 cannot be extracted, there is a drawback that the construction cannot be performed.

The present invention has been made in view of the above circumstances, and even when there is no place where overflow of uncured resin can be confirmed, the inside of the pipe from the opening of the existing pipe to a desired position in the middle of the existing pipe is lined. The purpose is to be able to. Another purpose is that a cock is provided as a place where uncured resin overflow can be confirmed, but even if the closure cannot be removed, the inside of the pipe from the opening to the desired position in front of the cock can be lined. To do so.

[0011]

A first aspect of the present invention is characterized in that a pipe for lining is filled with an uncured resin for lining from an opening of an existing pipe, and a pig for lining which moves in the existing pipe is used. A lining layer obtained by applying an uncured resin to the inner surface of the pipe and curing the applied uncured resin, which is an in-pipe lining method of lining the inside of the pipe, and inserting a plurality of the pigs into the existing pipe from the opening. While filling the uncured resin between the pigs, the existing pipe on the lower side in the pig moving direction than the opening, by receiving a sound wave or a reflected wave of an electromagnetic wave transmitted into the pipe, the sound wave or A distance measuring device capable of measuring a distance along the existing pipe from the transmission position of the electromagnetic wave to the reflection point of the sound wave or the electromagnetic wave is attached, and the position of the pig moving in the existing pipe is
While monitoring based on the measurement result of the distance along the existing pipe from the transmission position of the sound wave or the electromagnetic wave to the pig by the distance measuring device that receives the reflected wave of the sound wave or the electromagnetic wave from the pig side, the plurality of The point is to move the pig.

[Operation] A plurality of pigs are inserted through the openings, uncured resin for lining is filled between the pigs, and the existing pipes on the lower side of the pig moving direction than the openings are inserted into the pipes. A distance measuring device capable of measuring the distance along the existing pipe from the sound wave or electromagnetic wave transmission position to the sound wave or electromagnetic wave reflection position is received by receiving the transmitted sound wave or electromagnetic wave reflected wave.

When a plurality of pigs inserted into the existing pipe are moved from the opening of the existing pipe, the position of the pig moving in the existing pipe is determined by the distance at which the reflected wave from the pig side of the sound wave or the electromagnetic wave is received. While monitoring based on the measurement result of the distance along the existing pipe from the sound wave or electromagnetic wave transmission position by the measuring instrument to the pig, multiple pigs were moved and those pigs moved to the desired position or near the desired position. When it is determined that all the pigs have been moved to, the movements of the pigs are stopped, and the pigs are reciprocated in the pipe between the opening and the desired position in the existing pipe by moving the pigs in the opposite direction toward the opening. The lining layer is made by moving and applying the uncured resin for lining filled between the pigs to the inner surface of the pipe, and the uncured resin that has been applied is cured, and the opening and the desired position in the middle of the existing pipe. Can lining in the tube between.

[Effect] When lining the inside of the pipe between the opening and a desired position in the middle of the existing pipe, when moving the plurality of pigs inserted from the opening toward the desired position, the inside of the existing pipe is moved. Since the position of the moving pig is moved while monitoring it, there is no need to check the overflow of the uncured resin near the desired position as in the conventional method, and there is no place to check the overflow of the uncured resin. But
The inside of the pipe can be lined from the opening of the existing pipe to a desired position in the middle of the existing pipe.

According to a second aspect of the present invention, the existing pipe is provided with a buried pipe portion buried in the ground and an exposed pipe portion exposed to the ground. A cock is provided on the way, and the plurality of pigs are inserted into an existing pipe through an opening provided in the buried pipe portion, and the uncured resin is filled between the pigs, and the exposed pipe portion is provided. The distance measuring device is attached to the pipe end portion of the pipe, and the plurality of pigs are moved in the pipe from the opening to the cock while monitoring the position of the pig moving in the existing pipe based on the measurement result. Then, the uncured resin is applied to the inner surface of the pipe between the opening and the cock.

[Operation] A distance measuring device is attached to the pipe end of the exposed pipe portion of the existing pipe that is exposed to the ground. Then, when a plurality of pigs inserted from the opening provided in the buried pipe portion are moved in the pipe toward the cock provided in the middle of the exposed pipe portion, the position of the pig moving in the existing pipe is While monitoring based on the measurement result of the distance along the existing pipe from the pipe end to the pig by the measuring instrument, move multiple pigs from the opening toward the cock, and those pigs reach the desired position in front of the cock. When it is determined that the pigs have moved or have moved to a position close to the desired position, the movements of the plurality of pigs toward the cock are stopped, and the pigs are moved toward the openings in the opposite directions to move the pigs to the openings. By reciprocating in the pipe with the cock, apply the uncured resin for lining filled between those pigs to the inner surface of the pipe,
With a lining layer that is a cured uncured resin that has been applied,
The inside of the pipe between the opening and the cock can be lined.

[Effect] When lining the inside of the pipe between the opening and the cock, when a plurality of pigs inserted from the opening are moved toward the cock in the pipe, the position of the pig moving in the existing pipe is adjusted. Since it is moved while monitoring, it is not necessary to remove the closure from the cock and attach the lining closure as in the conventional construction method, although the cock is provided as a place where the overflow of uncured resin can be confirmed, Even if you can't remove the closure,
The inside of the pipe from the opening to the desired position in front of the cock can be lined.

According to a third aspect of the present invention, the position of the pig moving in the existing pipe is measured by the distance measuring device, and the distance from the pipe end to the pig along the existing pipe is measured. The point is to monitor based on the distance along the existing pipe from the pipe end to the cock.

[Operation] With respect to the position of the pig moving in the existing pipe, the distance measurement result of the distance along the existing pipe from the pipe end portion to the pig and the distance along the existing pipe from the pipe end portion to the cock are measured. While monitoring based on, that is, from the distance along the existing pipe from the pipe end to the pig measured by the distance measuring device, subtract the distance along the existing pipe from the pipe end to the cock, obtained from the pig to the cock Multiple pigs can be moved from the opening towards the cock while monitoring the distance along the existing pipe up to.

[Effect] While monitoring the distance along the existing pipe from the pig moving in the existing pipe to the cock, it is possible to move a plurality of pigs from the opening toward the cock. It is possible to accurately line the inside of a pipe in a desired range.

According to a fourth aspect of the present invention, the pipe end portion is a connection point of a flow rate measuring device for measuring the flow rate of the fluid in the pipe, and the pipe end portion without the flow rate measuring device is connected to the pipe end portion. The point is to connect the distance measuring device.

[Operation] When a distance measuring device is connected to the end of the pipe from which the flow rate measuring device is removed and a plurality of pigs inserted from the opening are moved toward the cock in the pipe, the pig moving in the existing pipe Move while monitoring the position of, and after those pigs have moved to the desired position in front of the cock or near the desired position, remove the distance measuring device from the pipe end and attach it to the pipe end. A flow meter can be connected.

[Effect] By attaching and detaching the flow rate measuring device, the distance measuring device can be easily connected.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts. FIG. 1 shows a gas conduit (an example of an existing pipe) C branched from a main branch B for supplying city gas, which is buried under a road A. This gas conduit C is connected from the branch point with the main branch B to the public and private sector. An embedded pipe portion F that is buried in the ground inside the site E on the user side beyond the boundary line D and an exposed pipe portion G that is exposed to the ground on the user side are provided.

The gas conduit C is a polyethylene resin supply pipe C1 from a branch point with the main branch pipe B to a public-private boundary line D, and a steel inner pipe C2 in the site E on the user side from the public-private boundary line D. Are connected by a pipe joint Q.

The exposed pipe portion G is connected to a meter standpipe G1 to which a gas meter (an example of a flow rate measuring device) H for measuring the gas flow rate is connected, and from the gas meter H to a gas plug K for each gas appliance in the building J. The meter standing pipe G1 is provided through the inside of the outer wall L of the building J.

An insulating joint N and a meter gas plug (an example of a cock) M are connected in the middle of the meter stand pipe G1, and the meter gas plug M is exposed so that it can be operated indoors. As shown, the meter gas plug M is surrounded by the wall material L1 and the valve body (gas plug closure) M1.
Since the operation portion M2 and the operation portion M2 are attached along the direction along the wall surface, the operation portion M2 can open and close the valve body M1, but the wall material L1 interferes with the operation of the valve body M1 and the valve body M1.
It cannot be removed from 3.

Hereinafter, an opening 1 for inserting a pig is provided in the buried pipe portion F of the gas conduit C, and two pigs P1 and P2 for lining are inserted from the opening 1 and these pigs P1 and P1 are inserted.
P2 is reciprocated in the pipe between the opening 1 and the meter gas plug M, and an uncured resin 2 such as a lining epoxy resin filled between the pigs P1 and P2 is applied to the inner surface of the pipe. An in-pipe lining method of lining the inside of the pipe between the opening 1 and the meter gas plug M with the lining layer 3 obtained by curing the applied uncured resin 2 will be described.

As shown in FIG. 2, an opening 1 for pig insertion is provided in the pit 4 excavated on the side of the road A by exposing the middle of the buried pipe portion F, and the opening 1 has an L-shaped cylindrical pig. By connecting the insertion jig 5 and receiving the reflected wave of the sound wave transmitted in the pipe at the connecting portion of the gas meter H, at the pipe end portion 6 of the exposed pipe portion G where the gas meter H is removed, A distance measuring device 7 capable of measuring the distance along the gas conduit C from the tube end 6 to the reflection point of the sound wave is connected.

The distance measuring device 7 has a length measuring sensor 7a having a function of transmitting a sound wave and a receiving function of receiving a reflected wave of the sound wave, and a reflection of the sound wave after the length measuring sensor 7a transmits the sound wave. A measuring device 7b capable of measuring the distance from the length measuring sensor 7a to the reflection point of the sound wave is provided on the basis of the measurement result of the time until the wave is received. 6 is provided so that the distance from the length measuring sensor 7a to the reflection point of the sound wave can be measured.

Then, as shown in FIG. 5, the meter gas stopper M is closed by closing the operating portion M2, and the distance R1 along the gas conduit C from the pipe end 6 to the meter gas stopper M is measured by the distance measuring device 7. After the length measuring sensor 7a transmits a sound wave into the pipe and receives a reflected wave of the sound wave from the valve body M1, the meter gas plug M is measured.
Keep open.

In this way, from the pipe end 6 to the meter gas plug M
Since the distance R1 along the gas conduit C up to is measured by the distance measuring device 7, it is easy to estimate the distance R1 along the gas conduit C from the pipe end 6 to the meter gas plug M, or to measure with a scale or the like. In addition, the distance R2 along the gas conduit C to the meter gas plug M of the pig P1 on the front side in the moving direction can be monitored accurately.

Next, as shown in FIG. 3, two pigs, a first pig P1 and a second pig P2, are mounted on the pig insertion jig 5, and the two pigs P1 and P2 are placed between them. The uncured resin 2 such as an epoxy resin for lining is filled, and the pig operating unit 8 which can supply pressurized air into the pipe is connected to the pig inserting jig 5, and the pressurized air supplied from the pig operating unit 8 is supplied. Insert the two pigs P1 and P2 together with the uncured resin 2 into the pipe through the opening 1 and move the uncured resin 2 toward the meter gas plug M as shown in FIG. Apply to.

Although the first pig P1 is made of a sponge material having a smooth surface, it may be made of a hard resin so as to easily reflect sound waves, or the surface of the hard resin may be coated with rubber. Is also good.

When moving the two pigs P1 and P2 together with the uncured resin 2 in the pipe toward the meter gas plug M, the gas pipe C from the pipe end 6 to the first pig P1 on the front side in the moving direction. The distance R3 along with is measured at every predetermined time by the distance measuring device 7, and the pipe R is moved toward the meter gas stopper M while monitoring the distance R2 along the gas conduit C to the meter gas stopper M of the first pig P1. .

That is, the pipe end portion 6 measured based on the measurement result of the time from the length measuring sensor 7a transmitting a sound wave at a predetermined time until receiving the reflected wave of the sound wave from the first pig P1 side. Based on the distance R3 along the gas conduit C from the first to the first pig P1 and the distance R1 along the gas conduit C from the pipe end 6 to the meter gas plug M measured by the distance measuring device 7 as described above, that is, Along the gas conduit C from the pipe end 6 measured by the distance measuring device 7 to the first pig P1 along the gas conduit C, and from the pipe end 6 measured by the distance measuring device 7 to the meter gas plug M. While monitoring the distance R2 along the gas conduit C from the first pig P1 to the meter gas plug M obtained by subtracting the distance R1, the two pigs P1 and P2 together with the uncured resin 2 from the opening 1 to the meter gas plug M. Towards So moved.

Then, from the first pig P1 to the meter gas plug M
From the result of monitoring the distance R2 along the gas conduit C up to, when the distance R2 reaches the desired distance R, the supply of the pressurized air is stopped or the inside of the pipe between the opening 1 and the second pig P2 is increased. After returning to atmospheric pressure, as shown in Fig. 6, two pigs P
The movement of 1 and P2 toward the meter gas plug M is stopped.

Next, the pig operating unit 8 connected to the pig inserting jig 5 is removed, and the distance measuring device 7 is removed from the pipe end portion 6, and as shown in FIG. While the pig operating unit 8 is connected to, and the uncured resin 2 is surely applied to a portion such as a stepped portion in a pipe where a joint is provided by a pressurized air supplied from the pig operating unit 8 where uncoating is likely to occur. , The two pigs P1 and P2 are moved toward the opening 1 together with the remaining uncured resin 2, and the two pigs P1 and P2 and the surplus uncured resin 2 are placed in the jig insertion jig 5. Collected, pig insertion jig 5 and pig operation unit 8
Are removed from the gas conduit C, and the opening 1 and the meter gas plug M are formed by the lining layer 3 obtained by curing the applied uncured resin 2.
Line the inside of the pipe.

Other Embodiments 1. The pipe lining construction method according to the present invention uses a pig having a metal that easily reflects radio waves embedded therein and a pig that has a surface that easily reflects light, in an existing pipe on the lower side of the pig moving direction than the opening, By receiving the reflected waves of electromagnetic waves such as radio waves and light emitted inside the pipe, connect a distance measuring device that can measure the distance along the existing pipe from the pipe end to the electromagnetic wave reflection point, and move inside the existing pipe Move multiple pigs while monitoring the position of the pig based on the measurement result of the distance along the existing pipe from the sound wave or electromagnetic wave transmission position to the pig by the distance measuring device that received the reflected wave from the pig side of the electromagnetic wave. You may let me. 2. In the pipe lining method according to the present invention, an object for reflecting a sound wave or an electromagnetic wave may be provided in front of the pig on the front side in the moving direction, and the reflected wave from the object may be received. 3. The pipe lining method according to the present invention may be used by estimating the distance along the existing pipe from the pipe end portion to the cock from the relative position between the pipe end portion and the cock, or by actually measuring the scale. 4. The pipe lining construction method according to the present invention, while continuously monitoring the position of the pig on the front side in the moving direction and the distance along the existing pipe to the cock with a monitor screen or the like, the inside of the pipe from the opening toward the cock with a plurality of pigs. You may move it. 5. The pipe lining method according to the present invention is a method of inserting a plurality of pigs into an existing pipe through an existing opening such as a branch pipe joint provided in an existing pipe, and filling an uncured resin for lining between the pigs. Is also good. 6. The pipe lining method according to the present invention is an existing opening such as a branch pipe joint provided in an existing pipe, and by receiving a reflected wave of a sound wave or an electromagnetic wave transmitted into the pipe, the sound wave or the electromagnetic wave from the transmission position of the electromagnetic wave or You may equip the distance measuring device which can measure the distance along the existing pipe to the electromagnetic wave reflection part. 7. The pipe lining method according to the present invention may be used for lining the inside of existing pipes for liquids such as water pipes and sewer pipes other than gas pipes.

[Brief description of drawings]

[Fig. 1] Illustration of the pipe lining method

[Fig. 2] Illustration of the pipe lining method

FIG. 3 is an explanatory diagram of the pipe lining method.

FIG. 4 is an explanatory diagram of the pipe lining method.

FIG. 5 is an explanatory view of the pipe lining method.

FIG. 6 is an explanatory view of a pipe lining method.

FIG. 7 is an explanatory diagram of the pipe lining method.

FIG. 8 is an explanatory view of a conventional pipe lining method.

FIG. 9 is an explanatory view of a conventional pipe lining method.

[Explanation of symbols]

1 opening 2 uncured resin 3 lining layer 6 Pipe end 7 Distance measuring instrument C existing pipe F buried pipe part G exposed pipe part H flow meter M cock P1 pig (pig in front of moving direction) P2 pig R1 distance R2 distance R3 distance

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H024 EA01 EB09 EC04 ED01                 3H025 EA01 EB23 EC01 EE01                 4D075 AG13 AG14 AG18 AG23 AG27                       CA33 DA14 DA19 DA27 DB01                       DC05 EB33

Claims (4)

[Claims] 1. An uncured resin for lining is filled into a pipe from an opening of an existing pipe, and the uncured resin is applied to an inner surface of the pipe with a lining pig that moves in the existing pipe. With a lining layer obtained by curing a curable resin, an in-pipe lining method for lining the inside of a pipe, wherein a plurality of the pigs are inserted into the existing pipe through the opening,
While filling the uncured resin between the pigs, the existing pipe on the lower side of the pig moving direction than the opening, by receiving the reflected wave of the sound wave or the electromagnetic wave transmitted into the pipe, A distance measuring device capable of measuring the distance along the existing pipe from the transmission position to the reflection point of the sound wave or the electromagnetic wave is mounted, and the position of the pig moving in the existing pipe is from the pig side of the sound wave or the electromagnetic wave. An in-pipe lining construction method of moving the plurality of pigs while monitoring based on a measurement result of a distance along the existing pipe from the transmission position of the sound wave or the electromagnetic wave by the distance measuring device that receives the reflected wave to the pig. 2. The existing pipe includes an embedded pipe portion buried in the ground and an exposed pipe portion exposed to the ground, and a cock is provided in the middle of the exposed pipe portion, The plurality of pigs are inserted into an existing pipe through an opening provided in the buried pipe portion, the uncured resin is filled between the pigs, and the distance measuring device is provided at a pipe end portion of the exposed pipe portion. Mounted, and while monitoring the position of the pig moving in the existing pipe based on the measurement result, by moving the plurality of pigs in the pipe from the opening toward the cock, the opening and the cock The pipe lining method according to claim 1, wherein the uncured resin is applied to the pipe inner surface between and. 3. The position of the pig that moves in the existing pipe,
The method for monitoring based on a measurement result of a distance along the existing pipe from the pipe end portion to the pig by the distance measuring device and a distance along the existing pipe from the pipe end portion to the cock. In-pipe lining method. 4. The pipe end portion is a connection point of a flow rate measuring device for measuring the flow rate of the fluid in the pipe, and the distance measuring device is attached to the pipe end portion excluding the flow rate measuring device. Or the pipe lining construction method described in 3.