JPH0316897B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for lining the inner surface of a branch pipe connected to a main pipe with a tube in existing pipelines for city gas, natural gas, water supply, and other existing pipelines.

Conventionally, when introducing a lining tube into a branch pipe, it has been generally thought that the lining tube is inserted through an opening formed by cutting the pipe downstream of the processing portion of the branch pipe. However, if the main pipe is not cut near the connection between the main pipe and the branch pipe, the lining tube may become long and protrude into the main pipe, causing transportation troubles, or the lining tube may become short and the branch pipe becomes too long. If there is a problem with the lining on the inlet side, or if the main pipe is cut near the connection between the main pipe and the branch pipe to improve the lining of the branch pipe, it may be necessary to cut the main pipe when there are many branch pipes to be processed. Excavation, etc., were required in many places, which required a lot of expense and labor, and there were major drawbacks in both cases.

SUMMARY OF THE INVENTION An object of the present invention is to easily and reliably line branch pipes with good quality, and to cut the main pipe at low cost and with less labor even if there are a large number of branch pipes to be processed.

The characteristic means of the lining method according to the present invention is that the main pipe is cut on both sides of the location where the branch pipe to be treated exists, and a linear body inserted through the opening of the branch pipe is passed to one side of the main pipe. A stopper that locks the main pipe to the pipe at the connecting part, and a mesh tube in which one end of the lining tube is connected to the rear end of the introduction, are connected to the front end of the main pipe by the tensile action of the linear body. A lining tube that is withdrawn from a pipe to the opening of the branch pipe, locks a stopper to the connection between the branch pipe and the main pipe, and is placed into the branch pipe at the same time as or after the reticular tube is withdrawn. The purpose of this method is to expand and attach the reticulated tube to the inner surface of the branch pipe, and its effects are as follows.

In other words, by drawing the lining tube from the main pipe side into the branch pipe with a linear body passed from the branch pipe to the main pipe, and determining the position of the main pipe side end of the lining tube by the action of the stopper, It is possible to reliably prevent an inconvenient situation in which the lining tube comes out to the main pipe side or the main pipe side of a branch pipe is not lined.

Furthermore, even if there are many branch pipes to be treated, lining tubes can be introduced to all branch pipes over an appropriate range by simply cutting the main pipe on both sides of the branch pipes. Main pipe cutting work that involves excavation etc. can be reduced.

In addition, since the wire is routed from the small-diameter branch pipe side to the large-diameter main pipe side, the wire threading work can be carried out easily and smoothly by using, for example, pressurized movement of a parachute-like traction tool. Conversely, the wiring work can be simplified compared to wiring from the main pipe to the branch pipe.

Since the lining tube is introduced and attached to the reticular tube within the small-diameter branch pipe, the lining tube will not be damaged due to contact with the branch pipe, and
Since the stopper with a large retraction resistance is moved to the locking position using a mesh tube, there is no risk of damage to the lining tube compared to, for example, retracting the stopper using a lining tube, and the overall result is a good lining with no defects. Processing can be performed reliably. As a result, the inner lining of existing branch pipes can be properly and reliably lined, and even when there are many target pipes to be treated,
The cost and labor required for cutting the main pipe are small, and in addition,
Work such as wiring and introducing tubes into pipes can now be carried out easily and quickly, and the lining can now be constructed in excellent conditions in terms of reliability, economy, and workability.

Next, examples will be shown.

As shown in FIG. 1A, the buried main pipe 2 is excavated and cut on both sides of the location where there are a large number of branch pipes 1 to be treated. The main pipes 2a and 2b on the upstream and downstream sides of the cut point are closed with cups 3 to prevent the transport fluid from leaking.

Next, as shown in FIG. A parachute-like traction tool 5 connected to the tip of the pipe is inserted into the branch pipe 1 through the opening 1a, a lid 6 and a blower 7 are attached to the branch pipe 1, and the pressure gas from the blower 7 is used to move the traction tool 5 into the branch pipe 1. The linear body 4 from the reel 8 is fed to the branch pipe 1 under pressure.
Connect to. Then, the length of the branch pipe 1 is measured from the feeding length of the linear body 4.

Next, as shown in FIG. The pulling tool 5 is force-fed to the other main pipe cutting part using pressure gas, and the linear body 4 from the reel 8 is passed from the branch pipe 1 to the main pipe cutting part.

Next, as shown in FIG.
In a state where the rear end sides of the lining tube 11 are connected, a ring-shaped stopper 13 with a flange is connected to the connection part, and an adhesive is applied to the inside of the lining tube 11, and both tubes 11, A linear body 14 for forward guidance such as a rope extending over the entire length within the lining tube 12 and a linear body 15 for rear guidance such as a rope connected to the closed introduction rear end side of the lining tube 11 are attached. The introduction front end side of the mesh tube 12 is connected to the linear body 4 at the main pipe cutting part side.

Next, branch pipe 1 with lid 6 and blower 7 removed
By pulling the linear body 4 from the side by driving the reel 8 or the like, as shown in FIG. The stopper 13 is fitted into the branch pipe 1 at the connecting portion thereof, and the lining tube 11 is pulled into the branch pipe 1.

Next, as shown in FIG. The lining tube 11 is inverted and expanded into the branch pipe 1 by the pressurized gas, and the lining tube 11 is introduced into the branch pipe 1 while being adhered together with the mesh tube 12 by adhesive. At this time, the front guiding linear body 14 is pulled and the mesh tube 12
At the same time, the lining tube 11 is guided at the bending part of the branch pipe 1, and the brake 19 provides appropriate pulling resistance to the rear guidance linear body 15.
The introduction speed of the lining tube 11 is adjusted.

Next, as shown in FIG.
2 and the lining tube 11 are cut to appropriate lengths, the guiding and rear guiding linear bodies 14 and 15 are removed, and the tube end treatment ring 20 is fitted into the branch tube 1.

Then, the treatments shown in FIG.

Finally, the main pipe 2 is connected and backfilled, and the branch pipe 1 is installed and connected to return it to its original state and the construction is completed.

Next, another example will be described.

In order to run the wire from the opening 1a of the branch pipe 1 to one of the main pipe cutting parts, the specific configuration of the pressure-feed type traction tool 5 used can be changed as appropriate, and a different wire threading method such as a wire pushing method can be used. It's okay.

Reticulated tube 12 and lining tube 11
To introduce the lining tube 11 into the reticulated tube 12 as shown in FIG. The passage may cause the lining tube 11 to expand and adhere.

Lining tube 11 and mesh tube 12
Various adhesives can be used to attach the lining tube 1 to the branch pipe 1. If a thermosetting adhesive is used, steam or hot air is supplied into the lining tube 11 during or after expansion of the lining tube 11.

When the lining tube 11 is reversely introduced into the branch pipe 1, pressurized gas may be supplied by the blower 10 used for wiring the main pipe 2, and one or both of the forward guiding linear bodies 14 and 15 may be used. may be omitted.

The main pipe 2 and the branch pipe 1 are not particularly limited in terms of use, material, arrangement, etc., but buried pipes for city gas and natural gas are preferred.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the method of the present invention, FIG. 1...branch pipe, 1a...opening, 2...main pipe, 4
... Linear body, 11 ... Lining tube, 12
... Reticulated tube, 13 ... Stop.

Claims (1)

[Claims] 1. Cut the main pipe 2 on both sides of the location where the branch pipe 1 to be treated exists, and thread the linear body 4 inserted through the opening 1a of the branch pipe 1 to one side of the main pipe 2. , a stopper 1 that locks the pipe at the joint between the branch pipe 1 and the main pipe 2
3 and one end of the lining tube 11 is connected to the introduction rear end side, and the mesh tube 12 is connected to the introduction front end side.By the tensile action of the linear body 4,
The main pipe 2 is pulled in to the opening 1a of the branch pipe 1, and the stopper 13 is locked to the connecting part of the branch pipe 1 and the main pipe 2, and the stopper 13 is placed in the mesh tube at the same time as or after the mesh tube 12 is drawn in. A method for lining an existing branch pipe, in which a lining tube 11 introduced into a branch pipe 1 is expanded and attached to the inner surface of the branch pipe 1 together with a mesh tube 12. 2. Connect the introduction front end of the lining tube 11 to the introduction rear end of the mesh tube 12, and after locking the stopper 13 to the connection part, pressurized gas is supplied from the main pipe 2. The method according to claim 1, wherein the lining tube 11 is introduced into the branch pipe 1 while being inverted and expanded.