JPH0544889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for backfilling heat-pressurized expanded rigid tube lining.

Conventional technology and its problems Conventionally, as an inner lining method for existing buried pipes,
A heating and pressurizing expansion method has been proposed in which a hard tube made of thermoplastic synthetic resin having a smaller diameter than the pipe is inserted into a buried pipe, and then the hard tube is heated and pressurized from the inside to expand and line the pipe. The hard tube lining formed by applying such a heating and pressurizing 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 lining. However, due to thermal contraction after expansion under heating and pressure, a gap inevitably occurs between the buried pipe and the hard tube lining, and this gap becomes a flow path for groundwater to infiltrate through joints, etc., preventing groundwater from infiltrating into the buried pipe. will be invited. Infiltration of groundwater into the buried pipe 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, injection filling is not recommended. Depending on the length of the buried pipe, the pot life of the liquid could be exceeded, forcing the work to be stopped.

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

Means for Solving the Problems The present invention is based on thermal contraction that occurs between an existing buried pipe and a hard tube lining that is lined with the buried pipe by applying a heating and pressurizing expansion method.
This is a construction method for backfilling the space between the pipes by filling the pipe with liquid, and an intra-pipe injector equipped with a packer part that can be expanded and contracted is installed on the ground side of a branch pipe branched from the buried pipe with the packer part reduced. It is inserted into the inside through the pipe opening, and after reaching the buried pipe side pipe opening by this insertion, the packer part is expanded to form a liquid filling cavity between the hard tube lining and the directly facing hard tube lining, and this filling cavity Fill the sky through
This method relates to a backfilling method for heated and pressurized expanded hard tube lining, which is characterized by injecting and filling the liquid agent into the space between the buried pipe and the hard tube lining by operating the above-mentioned injector. .

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

The figure shows a main sewage pipe 1 as an existing underground pipe, and a branch pipe 2 (attached pipe) from the main pipe 1 is connected to a sewage groove (not shown) installed on the ground surface, and this sewage The opening into the groove is used as a working opening. In addition, a hard tube lining 3 (made of vinyl chloride resin, for example) is formed on the main sewage pipe 1 by applying a heating and pressurizing expansion method, and between the lining 3 and the main sewage pipe 1, there is a The original period 〓4 has occurred.

When backfilling the above gap 4, plugs 5 are installed at both ends of the sewer main 1 and hard tube lining 3.
a, 5b, and the above-mentioned plugs 5a, 5b are provided in the space 4.
It is opened to the outside through an annular through hole 6 and an exhaust hole 7 formed in 5b in sequence.

Using the pipe opening (not shown) on the sewer side of the next branch pipe 2, the intraduct syringe 8 is inserted into the branch pipe 2 by pushing the hose 9 attached to the pipe 8.

The syringe 8 is equipped with a packer 10 made of rubber, for example, which can be expanded or contracted remotely. As shown in FIG. 1, the packer 10 maintains its contracted state while the syringe 8 is being inserted into the pipe, but as shown in FIG. When it comes into contact with the hard tube lining 3 surface, the air passage 9 inside the hose 9 will open at that position.
It is expanded by pressurized air supplied from a, and closes the portion of the branch pipe 2 closer to the main pipe 1 side. Due to this occlusion in the pipe, a liquid filling cavity 12 is formed between the lower end of the packer 10 and the hard tube lining 3, and this filling cavity 12 is formed between the sewage main pipe 1 and the hard tube lining 3. is connected to.

In this state, as shown in FIG.
When a liquid such as an epoxy resin liquid is injected from 3, the injected liquid 14 fills the filling space 12 and subsequently flows into the space 4. Air is discharged to the outside through the annular through hole 6 and the exhaust hole 7 as the liquid agent flows in.

Since the flow of the liquid into the space 4 spreads to both sides in the length direction centering on the branch pipe 2, the construction time can be reduced compared to the case of one-sided construction. In this case, if suction is carried out through the exhaust holes 7 and 7 of the plugs 5a and 5b and the inside of the gap 4 is maintained in a reduced pressure state, the flow resistance of the liquid in the gap 4 will be reduced, so that Construction time can be further reduced.

The branch pipe 2 is usually attached to the main sewage pipe 1 using a mortar-based adhesive, but cracks and the like often occur at the attachment part due to long-term use. A part of the liquid agent injected into the filling cavity 12 flows into the cracks of the attachment part and fills them, so in addition to backfilling the hard tube lining, repair of the attachment part of the branch pipe 2 is necessary. can be achieved at the same time. In addition, if there is a joint part 1a in the middle of the waterless main pipe 1, the liquid agent also flows into the joint part 1a and is filled, so that the joint part 1a can be repaired at the same time.

After finishing the injection operation of the liquid agent, press the packer section 10.
is contracted, and the syringe 8 is recovered from within the branch pipe 2.

During backfilling, the main pipe 1 side port of the branch pipe 2 is blocked by the hard tube lining 3 and the solidified residue of the liquid, so this blockage can be removed using a known pipe perforator or the like. The perforation is removed and opened by application.

During the backfilling operation, the injection and filling pressure of the liquid agent is applied to the portion of the hard tube lining 3 facing into the filling cavity 12, so depending on the thickness of the lining 3, etc. Therefore, the inside of the lining 3 may be maintained in a pressurized state.

Effects In the construction method of the present invention, when backfilling the heated and pressurized expanded rigid tube lining, the branch pipe attached to the pipe to be constructed is used as a work opening, and the liquid is injected from the middle toward both sides. I did it like this,
Compared to construction from one side, construction time is reduced by 1/2.
It has the feature that it can be shortened by about 2 to 1/3.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view showing the state when the syringe is inserted in the construction method of the present invention, Figure 2 is an enlarged cross-sectional view of the main part showing the state of tube blockage by the syringe, and Figure 3 is the liquid filling operation using the syringe. FIG. In the figure, 1 is the main sewage pipe, 2 is the branch pipe, 3 is the hard tube lining, 4 is the pipe, 5a and 5b are the plugs, 8 is the syringe, 9 is the hose, 10 is the stopper, and 11 is the stopper. , 12 is a filling space, and 13 is an injection port.

Claims (1)

[Claims] 1. A construction method for backfilling the gap caused by thermal contraction between an existing buried pipe and a hard tube lining lined with the buried pipe by applying a heating and pressurizing expansion method, by filling with a liquid. , an intra-pipe syringe equipped with an expandable packer part is inserted into the inside of the above-mentioned underground pipe through the above-ground side pipe opening of the branch pipe branched from the buried pipe with the packer part reduced, and this insertion After reaching the pipe opening, the packer part is expanded to form a liquid filling cavity between the liquid agent and the hard tube lining that directly faces the liquid agent, and through this filling cavity, the liquid agent is connected to the filling cavity.
Between the buried pipe and the hard tube lining,
A backfilling method for heating and pressurizing expanded rigid tube lining, characterized by injecting and filling a liquid agent by operating the above-mentioned injector.