JPH0435328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for backfilling hard tube lining using a heat-pressure expansion method.

Conventional technology and its problems As a conventional inner lining method for pipes, after inserting a hard tube with a smaller diameter into the pipe,
A construction method has been proposed in which the tube is heated and pressurized from the inside to expand and line the inner surface of the conduit.
The hard tube lining formed by applying such a heat-pressure expansion method is itself hard and has shape-retaining properties, so it is possible to omit the application of an adhesive as seen in soft tube linings. However, due to thermal contraction after expansion under heating and pressure, a gap inevitably occurs between the pipe and the hard tube lining, and this gap becomes a passageway for groundwater to enter through the joints, preventing groundwater from entering the pipe. Infiltration will be invited. Infiltration of groundwater into the pipeline can be prevented by backfilling the gap by filling it with a liquid such as epoxy resin, but since the opening width of the gap is small and the injection filling resistance is large, it is difficult to inject. Filling takes time, and depending on the length of the pipeline, the pot life of the liquid may be exceeded, forcing the operation to be interrupted.

The present invention has been made with the aim of eliminating such conventional problems.

Means for Solving the Problems The present invention solves the problem by filling a gap caused by heat shrinkage between a pipe and a hard tube lining formed on the inner surface of the pipe by applying a heating and pressurizing expansion method. In this method for backfilling, a hard tube for forming the lining is provided with a groove extending in the pipe axis direction on its outer circumferential surface, and the hard tube with the groove is heated in the pipe. By expanding under pressure, a hard tube lining is formed on the inner surface of the pipe, and at the same time, an injection passage based on the groove is formed between the lining and the pipe, and the injection passage is formed between the pipe and the lining through the injection passage. This relates to a backfilling method for hard tube lining using a heating and pressurizing expansion method, which is characterized by injecting and filling a liquid agent between the two.

EXAMPLE A state of implementation of the construction method of the present invention will be described below based on the attached drawings.

In the construction method of the present invention, hard tube lining 2 is applied to the inner surface of pipe 1 by applying the heating and pressure expansion method.
As a hard tube 2' for forming the second
As shown by phantom lines in the figure, a hard tube 2' is used which has a groove 3a' extending in the tube axis direction on its outer peripheral surface. Although the figure shows a case where a plurality of grooves 3a' are formed at equal intervals, it is sufficient that at least one groove 3a' is formed. When the hard tube 2' with the groove 3a' is inserted into the conduit 1, it is heated and expanded from the inside under pressure, and the hard tube lining 2 is formed on the inner surface of the conduit 1 by this heating and pressurized expansion. Also, between the pipe line 1 and the lining 2,
An injection passage 3a is formed based on the groove 3a'.

Between the pipe line 1 and the lining 2 formed on the inner surface of the pipe line 1, a gap 3 is created due to thermal contraction of the lining 2, and in order to inject and fill the liquid into this gap 3, , the injection passage 3a is used.

FIG. 1 shows the situation during the injection and filling operation of the liquid agent into the space 3. One end side (left side in the figure) of the injection passage 3a is connected to the injection port 9a of the front stopper 9 via the ring passage 8, and the injection port 9a is connected to the pressurized liquid agent charging device 5 via the conduit 10. ing.
On the other hand, the other end side is connected to the exhaust port 12a of the rear plug 12 via the ring passage 11, and the exhaust port 12a includes:
An exhaust pipe 14 with an on-off valve 13 is provided.

When injecting the liquid into the space 3 above,
When the pressurized injection device 5 is operated with the valve 13 open and the liquid is supplied to the gap 3 and one end of the injection passage 3a through the conduit 10, the injection port 9a and the ring passage 8 in sequence, the liquid is as follows. While the flow mainly flows through the injection passage 3a, which has a larger opening width than the above interval 3, that is, the injection passage 3a, which has a small flow resistance, a part of the flow is connected to the side through the injection passage 3a. It is injected and filled. Therefore, the injection and filling of the liquid agent into the gap 3 can be carried out quickly, and the injection and filling performance can be significantly improved compared to the case where the injection passages 3a are not provided.

Since the liquid agent is injected and filled first on the side of the injection passage 3a and slightly delayed on the side of the gap 3, there is a possibility that a slight air pocket may be generated in the gap 3, but the hard tube lining 2 itself has shape retention properties. So there is no particular problem. The occurrence of such air pockets can be prevented by using a vacuum suction means.

Furthermore, as shown in FIG. 3, there is a branch pipe 1a in the pipe line 1.
If a seal 15 is attached to the pipe opening of the branch pipe 1a, in order to prevent liquid from entering the branch pipe 1a, a seal 15 is installed at the pipe opening of the branch pipe 1a by using an appropriate pipe construction machine before the process of lining the pipe line 1. , provided.

The seal 15 that closes the mouth of the branch pipe 1a and the hard tube lining 2 are perforated and removed by applying a known intrapipe perforator.

Effects According to the construction method of the present invention, grooves are provided in advance on the outer peripheral surface of the hard tube used for forming the hard tube lining, and based on the grooves, the pipe and the hard tube formed on the inner surface of the pipe are connected. An injection passage is formed between the lining and the liquid can be injected and filled into the space between the pipe and the lining on the inner surface of the pipe through this injection passage, improving the ability to fill the space with the liquid. Therefore, it has the feature that backfilling of hard tube lining can be carried out efficiently and reliably over its entire length.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view schematically showing one implementation of the construction method of the present invention, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a vertical cross-sectional view showing a modification of FIG. 1. In the figure, 1 is a conduit, 2 is a hard tube lining, 3 is a pipe, and 5 is a pressurized injection device.

Claims (1)

[Claims] 1. A construction method for backfilling the gap caused by heat shrinkage between a pipe and a hard tube lining formed on the inner surface of the pipe by applying a heat-pressure expansion method, by filling with a liquid, As the hard tube for forming the lining, a tube having grooves extending in the tube axis direction is used on the outer peripheral surface, and the grooved hard tube is expanded by heating and pressurizing in the pipeline. At the same time as forming a hard tube lining on the inner surface, an injection passage based on the groove is formed between the lining and the pipe, and a liquid agent is injected into the space between the pipe and the lining through the injection passage. A backfilling method for hard tube lining using the heat and pressure expansion method, which is characterized by filling.