JPH033103B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is useful when laying a thin-walled resin pipe in a tunnel as a pipe-laying route, or when inserting it into a fume pipe as another pipe-laying route. The present invention relates to a method for grouting the outer periphery of a thin-walled resin pipe.

Conventional technology When carrying a thin-walled resin pipe into a pipe-laying path such as a tunnel and laying it, it is necessary to inject grout into the hollow area around the outer periphery of the pipe in order to reinforce the thin-walled resin pipe within the pipe-laying path. be.

Problems to be solved by the invention However, since the laid resin pipes are thin and have low rigidity,
In the conventional technology, there was a problem in that the resin pipe was bent due to the pressure of the grout when it was injected into the outer peripheral cavity of the resin pipe.

The present invention solves the above problems, and aims to provide a method for grouting the outer periphery of a thin-walled resin pipe, which prevents the thin-walled resin pipe from bending due to the pressure of the grout.

Means for Solving the Problems In order to solve the above problems, the present invention provides a method of supplying pressurized fluid to the inside of a hollow elastic body that is in contact with the inner surface of a thin-walled resin pipe in a pipe laying path to expand the hollow elastic body. A thin-walled resin pipe comprising the steps of: reinforcing and supporting the inner surface of the thin-walled resin pipe; and injecting grout into the hollow space between the outer periphery of the thin-walled resin pipe and the pipe laying path in the reinforced and supported state. The present invention provides a method for performing perimeter grouting.

Function When carrying a thin-walled resin pipe into a pipe-laying path such as a tunnel and laying it, first, the tube inner surface support device is sent into the thin-walled resin pipe inside the tunnel, and then the elastic body is expanded with pressurized fluid. Press it against the inner surface of the thin-walled resin tube. That is, the inner surface of the thin resin tube is reinforced and supported by the elastic body. Next, in that reinforced support state,
Inject grout into the outer periphery of the thin-walled resin pipe.
After the grout has hardened, the pressurized fluid is discharged from the elastic body to contract the elastic body and prepare for the next grout application.

Embodiment FIG. 1 is a front view showing a state of grouting the outer periphery of a thin-walled resin pipe according to a first embodiment of the present invention, and FIG. 2 is a side view of FIG. 1.

In these figures, a tunnel 1 serving as a pipe laying path has a slightly larger diameter than a thin-walled resin pipe 2. The cylindrical body 3, which has a smaller diameter than the thin-walled resin tube 2, can freely travel in the length direction of the thin-walled resin tube 2, that is, in the direction of arrow A, by means of wheels 4. The wheel 4 is configured such that when the cylindrical body 3 is inserted into the thin-walled resin pipe 2, the cylindrical body 3 is located substantially concentrically with the thin-walled resin pipe 2. The outer periphery of the cylindrical body 3 is reinforced by ribs 5. The tube-shaped elastic body 6 is made of rubber and is formed into a cylindrical shape.
It is attached to the outer periphery of the cylindrical body 3 and completely covers the outer periphery of the cylindrical body 3. A pressurized fluid supply/discharge port 7 for supplying pressurized fluid (here, compressed air) to the inside of the elastic body 6 and for discharging it protrudes toward the inner peripheral side of the cylinder body 3 and is connected to a manual on-off valve 8. It is said that it can be opened and closed freely. The outer periphery of the elastic body 6 is covered with a hard rubber 9 having a constant thickness, and the hard rubber 9 covers the elastic body 6.
It is divided into four parts in the circumferential direction so as not to impede expansion and contraction.

Next, a method of using the pipe inner surface support device 10 configured as described above, that is, a procedure for grouting the outer periphery of the thin-walled resin pipe 2 when the thin-walled resin pipe 2 is carried into the tunnel 1 and installed will be described.

First, the thin-walled resin pipe 2 is carried into a predetermined position in the tunnel 1 and set concentrically with the tunnel 1, and an empty section 11 surrounding the outer periphery of the thin-walled resin pipe 2 with a substantially uniform thickness is set.
form. Thereafter, the tube inner surface support device 10 is fed into the thin-walled resin tube 2. In this state, the cylindrical body 3 is positioned concentrically with the thin resin tube 2, so that the outer surface of each hard rubber 9 faces the inner surface of the thin resin tube 2 with approximately equal spacing therebetween. By supplying compressed air into the inside of the elastic body 6 from the pressure fluid supply/discharge port 7, the elastic body 6 is expanded and the hard rubber 9 is pressed against the inner surface of the thin resin tube 2. That is, the inner surface of the thin resin tube 2 is reinforced and supported by the elastic body 6. Next, in the reinforced and supported state, grout 12 is injected into the hollow part 11 on the outer periphery of the thin resin pipe 2. After the grout 12 hardens, compressed air is discharged from the pressure fluid supply/discharge port 7 to cause the elastic body 6 to contract. In this state, the hard rubber 9 is separated from the thin-walled resin tube 2, so that the tube inner surface support device 10 can be sent to the next working position.

3 and 4 show a second embodiment of the invention.
In this example, a hollow elastic body 6 made of a rubber tube is spirally wound around the outer periphery of the cylindrical body 3 so as to be expandable. Further, since the elastic body 6 in this case is expanded by supplying pressurized water, an air inlet/outlet section 13 having a manual opening/closing valve 16 is also provided in addition to the pressure fluid supply/discharge port 7 . Furthermore, in this example, the elastic body 6 is in direct contact with the inner surface of the thin-walled resin tube 2, but other than these points, the other configurations are the same as in the first example. Explanation will be omitted.

5 and 6 show a third embodiment of the present invention.
In this example, the cylindrical body 3 has a relatively small diameter, and the hollow elastic body 6 provided on the outer periphery extends 4 in the circumferential direction of the cylindrical body.
It is divided equally. Compressed air is supplied to each elastic body 6 from its own pressure fluid supply/discharge port 7 . The outer part of each elastic body 6 that expands thereby, which presses against the inner surface of the thin-walled resin tube 2, is formed of hard rubber 9 which is effective as a protective pad, and a reinforcing metal plate 14 is provided on the inner surface of the hard rubber 9. It is being Note that the tube inner surface support device 10 in this case is adapted to move by sliding directly on the inner surface of the thin resin tube 2 instead of being supported by the wheels 4 as shown in the first and second embodiments.

Effects of the Invention According to the present invention, when grout is injected into the outer circumferential space of the thin-walled resin pipe after the thin-walled resin pipe is carried into the tunnel, the inner surface of the thin-walled resin pipe is reinforced and supported, so the pressure of the grout is applied. It is possible to prevent the thin-walled resin pipe from bending.

[Brief explanation of the drawing]

FIG. 1 is a front view of the outer periphery grouting according to the first embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a front view of the outer periphery grouting according to the second embodiment of the present invention. 4 is a side view of FIG. 3, FIG. 5 is a front view of the outer periphery grouting state according to the third embodiment of the present invention, and FIG. 6 is a side view of FIG. 5. 1... Tunnel (laying passage), 2... Thin-walled resin pipe, 3... Cylindrical body, 4... Wheel, 6... Elastic body, 9
... Hard rubber, 11 ... Hollow part, 12 ... Grout, 14 ... Reinforcement metal plate.

Claims (1)

[Claims] 1. A step of reinforcing and supporting the inner surface of the thin-walled resin pipe by supplying pressurized fluid to the inside of the hollow elastic body that is in contact with the inner surface of the thin-walled resin pipe in the pipe laying path and expanding it, and A method for grouting the outer periphery of a thin-walled resin pipe, comprising the step of injecting grout into an empty space between the outer periphery of the resin pipe and a pipe laying path.