JP2635736B2 - Pipeline repair method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pipe repair method for repairing an old pipe by lining the inner peripheral surface of the old pipe.

(Conventional technology) When sewer pipes, electricity, gas pipes, and other industrial pipelines buried underground become obsolete, these pipelines are lined without excavating them. A pipe repair method for repairing and reinforcing the aged pipe has already been proposed and put into practical use (for example, see Japanese Patent Application Laid-Open No. 60-242038). In other words, this pipe line repair method inserts a pipe lining material obtained by impregnating a curable resin into a flexible tubular resin absorbent material whose surface is film-coated while inverting into an aged pipe by fluid pressure, This is pressed against the inner peripheral surface of the deteriorated pipe, and then the pipe lining material is heated to cure the curable resin impregnated in the pipe, thereby forming a rigid lining pipe on the inner circumference of the deteriorated pipe to form a lining. It is a construction method to apply.

(Problems to be Solved by the Invention) When a thermosetting resin is used as the curable resin impregnated in the pipe lining material used in the method, the thermosetting resin is a fluid such as water or air. Is heated indirectly as a heat medium, so that a large amount of heat energy and time are required for heating, and there is a problem that work efficiency and workability are poor.

In particular, when the thickness of the pipe lining material is large, a large temperature difference occurs between the inner peripheral portion in contact with the heat medium and the outer peripheral surface in contact with the inner peripheral surface of the pipeline. There is also a problem that thermal distortion occurs in the pipe lining material, and in the worst case, cracks occur in this.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a purpose thereof is to temporarily and uniformly heat a thermosetting resin impregnated in a pipe lining material with a small amount of energy to cure the same. Accordingly, it is an object of the present invention to provide a pipeline repair method capable of improving work efficiency and workability, reducing costs, and the like.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method in which a tubular lining material obtained by impregnating a thermosetting resin into a tubular resin absorbent material is reversely inserted into a pipeline by fluid pressure. While the pipe lining material is pressed against the inner peripheral wall of the pipe by fluid pressure, the pipe lining material is heated to cure the thermosetting resin impregnated in the pipe lining material, and the pipe is repaired with the hardened pipe lining material. In the pipe repair method described above, the heater lining material is formed by attaching two or more conductors having higher conductivity than the tubular member in the longitudinal direction of the flexible tubular member having conductivity. The heater tube and the pipe lining material are inserted into the pipe by fluid pressure, and then the heater tube and the pipe lining material are fluidized. The conductor of the heater tube is energized while being pressed against the inner peripheral surface of the conduit by pressure to cause the heater tube to generate heat. At least, and thereafter, the heater tube is removed from the pipeline.

(Operation) According to the present invention, the heater tube and the tube lining material having the inner and outer two-layer structure are integrally and reversely inserted into the pipeline by the fluid pressure, and then these are pressed against the inner peripheral surface of the pipeline by the fluid pressure. If current is passed through the conductor of the heater tube as it is, current flows from one conductor in the circumferential direction of the tubular member to the other conductor, and the tubular member as an electrical resistor generates heat, so the heater tube has the entire circumference and full length. Heats the thermosetting resin impregnated in the pipe lining material located on the outer peripheral side of the thermosetting resin uniformly, and instantaneously heats the thermosetting resin.
In addition, it cures uniformly. Then, if the heater tube is removed from the inside of the pipeline, the inner peripheral surface of the pipeline is lined with the hardened pipe lining material, and the repair is efficiently performed, and cracks are generated in the hardened pipe lining material. Does not occur. The removed heater tube can be reused for the next pipeline repair work.

Further, according to the present invention, since the heater tube can be heated only by energizing the conductor of the heater tube, a large amount of heat medium for heating the thermosetting resin is not required, and the heating equipment can be downsized. In addition, energy can be saved, and the cost required for repair work can be reduced.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view of a heater tube 1 used in a pipeline repair method according to the present invention.
Is formed by attaching two copper wires 3, 3 having higher conductivity than the tubular member 2 in the longitudinal direction of the flexible tubular member 2 having conductivity. The outer peripheral surface of the tubular member 2 is airtight, Urethane, polyester elastomer with high watertightness and electrical insulation,
It is coated with a film 4 such as silicon.
As the tubular member, for example, a nonwoven fabric formed by mixing carbon fibers with a polyester felt material is used.

Next, a pipe repairing operation performed using the heater tube 1 will be described with reference to FIGS.
FIG. 4 is a sectional view taken along line IV-IV of FIG.

In order to repair the branch pipe 6 branched from the main pipe 5 shown in FIG. 2, an elbow is attached by an arm 8 attached to the tip of a carrier 7 installed in the main pipe 5, as shown in FIG. 9 is supported, and a pipe lining material 10 is inserted into the elbow 9 together with the heater tube 1. The heater tube 1 is inserted inside the tube lining material 10 and located inside, and these constitute an inner and outer two-layer structure. In addition, pipe lining material
Reference numeral 10 is formed by impregnating a thermosetting resin into a felt material such as polyester.

Then, the heater tube 1 and the tube lining material 10
Is turned over and attached to the periphery of the upper end of the elbow 9. One end of a tube 11 is attached to the other end of the elbow 9, and the other end of the tube 11 is closed by a disc-shaped lid member 12. The lid member 12 is provided with a compressed air supply pipe 13, a pressure gauge 14, and a pressure regulating valve 15 which open into a space S formed in the tube 11, and the pipe 13 discharges an air compressor 16. A hose 17 extending from the side is connected. The two copper wires 3, 3 derived from the heater tube 1 extend through the lid member 12 to the outside of the space S, and are connected to a power source 18 installed on the ground.

Further, a temperature sensor 19 such as a thermocouple is embedded in the heater tube 1, and a lead wire 20 derived from the temperature sensor 19 is connected to a temperature controller 21 also installed on the ground. Is electrically connected to the power supply 18. The power supply 18 may be either AC or DC.

Thus, the air compressor 16 is driven, and the compressed air discharged from the air compressor 16 is passed through the hose 17 and the pipe 13 to the space S.
If supplied inside, heater tube 1 and tube lining material
Under the pressure of the compressed air, 10 is integrally and reversely inserted into the branch pipe 6.

When the inverted insertion of the heater tube 1 and the tube lining material 10 is completed over the entire length of the branch pipe 6 as shown in FIG. 3, the power supply 18 is turned on while maintaining the internal pressure of the space S at a predetermined value, and the heater tube is turned on. Power is supplied to the copper wires 3,3.

Then, while the heater tube 1 and the pipe lining material 10 are pressed against the inner peripheral wall of the branch pipe 6, the electric current is applied to one of the copper wires 3.
Flows in the circumferential direction of the tubular member 2 to the other copper wire 3,
The tubular member 2 as an electric resistor uniformly generates heat over the entire circumference and the entire length, and the heat directly heats the thermosetting resin impregnated in the tube lining material 10 to instantaneously and uniformly cure. As a result, pipeline repair work has progressed efficiently,
The inner peripheral surface of the branch pipe 6 is lined with a hardened pipe lining material 10.

The temperature of the heater tube 1 is detected by a temperature sensor 19, and based on the detected temperature, a temperature controller 21 controls a supply current of a power supply 18 to keep the temperature of the heater tube 1 constant.

In addition, since the thermosetting resin impregnated in the pipe lining material 10 is rapidly cured as described above, there is no thermal distortion in the thermosetting resin, and problems such as cracks occurring in the pipe lining material 10 after curing occur. Never do.

Furthermore, if the heater tube 1 is used, a large amount of heat medium is not required to heat the thermosetting resin, so that the heating equipment becomes small and compact, energy consumption is reduced, and the cost required for repair work is reduced. You can also.

After that, the heater tube 1 is connected to the pipe lining material.
When the pipe 10 is removed from the inside and the unnecessary portion of the pipe lining material 10 is cut and removed, the branch pipe 6 is lined with the hardened pipe lining material 10 as shown in FIG. 5, and the repair thereof is completed. The removed heater tube 1 is used repeatedly.

By the way, in the above embodiment, the repair method of the branch pipe has been described, but it is a matter of course that the present invention can be similarly applied to the main pipe.

(Effects of the Invention) As is clear from the above description, according to the present invention, the heater tube is heated by energizing the conductor of the heater tube, and the thermosetting resin impregnated in the tube lining material by the heater tube. Because the resin is directly heated, instantaneous and with little energy
The thermosetting resin uniformly impregnated in the pipe lining material can be heated and cured, and the effect of improving work efficiency and workability, reducing costs, and the like can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heater tube used in a pipe repair method according to the present invention, and FIGS. 2 to 5 are step views showing the pipe repair method according to the present invention in the order of steps. 4th
The figure is a sectional view taken along the line IV-IV in FIG. 1 ... heater tube, 2 ... tubular member, 3 ... copper wire (conductor), 10 ... tube lining material, 16 ... air compressor, 18 ... power supply.

Claims (1)

(57) [Claims] 1. A pipe lining material obtained by impregnating a thermosetting resin into a tubular resin absorbent material is reversely inserted into a pipe by fluid pressure, and then the pipe lining material is pressed against the inner peripheral wall of the pipe by fluid pressure. In a pipe line repairing method in which a pipe lining material is heated to cure the thermosetting resin impregnated in the pipe lining material and the pipe is repaired with the hardened pipe lining material, A heater tube configured by attaching two or more conductors having higher conductivity than the tubular member in the length direction of the tubular member is inserted into the tube lining material to form an inner / outer two-layer structure. After the pipe lining material is integrally and reversely inserted into the pipeline by the fluid pressure, the heater tube is pressed while the heater tube and the pipe lining material are pressed against the inner peripheral surface of the pipeline by the fluid pressure. The conductor is energized to heat the heater tube, and the heat generated by the heater tube heats the tube lining material to cure the thermosetting resin impregnated therein, and then removes the heater tube from the pipeline. A pipe repair method characterized by the following.