JPH0544890B2 - - Google Patents

Description

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

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 flow path for groundwater to enter through joints, cracks, etc., and flows into the pipe. This will lead to groundwater infiltration. 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. It takes a long time to fill, especially when the pipe line is 50~
If the length is as long as 150 m, there is a limit to the pot life of the liquid, which causes insufficient filling of the liquid, making backfilling difficult.

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 the gap caused by heat shrinkage between a pipe line and a hard tube lining formed on the inner surface of the pipe line by applying a heating and pressurizing expansion method. This is a method for backfilling, in which a multi-hole injection pipe is inserted between the pipeline and the lining in a process before forming the lining, and after the lining is formed, the injection pipe is inserted between the pipeline and the lining. The present invention relates to a method for backfilling hard tube lining, which is characterized by injecting and filling the gap between the linings with a liquid agent.

Embodiment An embodiment of the construction method of the present invention will be described below based on the attached drawings.

When carrying out the construction method of the present invention, as shown in FIG. 2 and is inserted into the conduit a as it is pulled by the rope 3.

The hard tube 2 is made of thermoplastic synthetic resin such as polyvinyl chloride, polyethylene, etc., and has an outer diameter corresponding to about 50 to 70% of the inner diameter of the pipe a, and is inserted into the pipe a during the insertion process. In order to obtain flexibility, the material is processed into a flat shape as shown in FIG. 2, and then heated with steam from the inside to soften it.

The injection tube 1 is made of heat-resistant rubber, for example, and is connected at its distal end to the distal end of a hard tube 2, and the portion following the distal end is attached to the lower end of the tube 2. The injection tube 1 may be inserted into the conduit a in a step before the rigid tube 2 is inserted into the conduit a.

Multi-hole injection pipe 1 and hard tube 2 into pipe a
3, the rigid tube 2 is expanded by heating and pressurizing it from the inside using conventional means, such as steam, so that the tube a
A hard tube lining 2' is formed on the inner surface of the tube.

This hard tube lining 2' is thermally shrunk during cooling and solidification, thus creating a gap 4 between it and the pipe line a, as shown in FIG. This gap 4 is pipe a
This becomes a flow path for underground water to infiltrate through the joint (not shown) and the bottom of the crack b, leading to water leakage, so it is necessary to eliminate it by backfilling.

FIG. 4 shows the backfilling process for hard tube lining, in which a liquid agent such as an epoxy resin is injected into the gap 4 through the injection pipe 1. The injection pipe 1 used for filling the liquid agent is porous and its entire length essentially functions as an injection port. The purpose of liquid injection filling can be achieved sufficiently reliably in a short time and thus within the pot life of the liquid.

Furthermore, in the case where a crack b has formed in the pipe a, a part of the liquid agent 5 injected into the gap 4 is injected and filled into the ground c in the vicinity of the crack b, and Similarly, since the liquid agent is injected and filled into the space at the joint part (not shown) of the pipe line a, the purpose of repairing the pipe line a can also be achieved at the same time.

During the injection and filling operation of the liquid agent into the space 4, the injection and filling pressure acts on the outer surface of the hard tube lining 2', so in order to counter this injection and filling pressure,
It is preferable to fill the lining 2 with a fluid such as water or air under pressure, in the case of air, under an enclosed state by the plugs 6, 6.

Also, as the air existing in the space 4 escapes from the pipe a through the joints and cracks of the pipe a as the liquid is injected into the space 4, it is especially necessary to apply an exhaust means. However, in order to obtain more reliable exhaust, exhaust holes 7, 7 for active suction may be provided at both ends of the conduit a, if necessary. The exhaust holes 7, 7 are closed by appropriate means after the injection and filling of the liquid agent 5 into the gap 4 has progressed to a certain extent and exhaustion is no longer necessary.

After the injection and filling operation of the liquid agent into the space 4 is completed, the porous injection tube 1 is buried at its insertion position.

The number of injection pipes 1 to be used is not limited to the one shown in the figure, and may be selected as appropriate depending on the diameter of the pipe a.

Effects According to the construction method of the present invention, the liquid agent can be applied in a short time within the gap 4 due to the heat shrinkage that occurs between the pipe a and the hard tube lining 2', and therefore the entire area within the pot life. It becomes possible to inject and fill the
This type of backfilling of the lining 2' can be carried out efficiently and reliably over its entire length.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view schematically showing the process of inserting a multi-hole injection pipe into a pipeline in the construction method of the present invention;
Figure 2 is a cross-sectional view taken along line A to A in Figure 1, Figure 3 is a vertical cross-sectional view schematically showing the formation of hard tube lining, and Figure 4 is a schematic view of the liquid injection filling process. The vertical sectional view shown in FIG. 5 is from B to B in FIG.
It is a sectional view along the B line. In the figure, 1 is a porous injection tube, 2 is a hard tube, 3 is a traction rope, 4 is a gap, and 5 is a liquid agent.

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, Between the pipe and the lining, in the process before forming the lining,
A method for backfilling hard tube lining, characterized in that a porous injection pipe is inserted, and after the lining is formed, a liquid agent is injected and filled through the injection pipe into the space between the pipe and the lining.