JPH0630526B2 - Underground pipeline repair tool - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a repair tool for an underground conduit that serves as a lead-in conduit for a cable for telecommunications installed underground, and more specifically, it has been used for a long time after installation. Due to the change, the pipe body may be broken or the pipe joint part may come off, resulting in a step difference and the like. It relates to repair tools to be secured.

[Conventional technology]

This type of underground pipe is usually constructed by laying a plurality of pipes vertically in multiple steps between manholes, lining up and down in the left and right, and arranging them under the road under the road. In the case of laying construction, an extra pipeline that is expected to be expanded in the future is laid at the same time, and the cable to be wired is selected and installed by selecting an arbitrary pipeline that is the empty pipeline. .

[Problems to be Solved by the Invention]

By the way, in such underground pipes, the pipe body may bend due to loosening of the ground, vibration, etc.
Alternatively, a broken state may occur due to breakage. In addition, for the same reason, the pipe joint may cause the joint to come off and become bent or stepped.
In addition, the pipe body is locally damaged by claws of excavators and excavators accompanying other construction, causing flat deformation, and defective parts such as locally recessed inside appear, When a new cable is drawn into the underground pipe of No. 1, there is a problem that the cable cannot be drawn in.

The present invention has been proposed to solve the above disadvantages by solving the problems.

[Means for Solving the Problems]

To this end, the present invention relates to a cylinder device having a cone-shaped propulsion head at the tip thereof, which is pulled by a wire and movably inserted into an underground pipeline, and when the progress of the propulsion head is hindered, A piston provided in the cylinder is operated to give a forward tapping action to the propulsion head, and the propulsion head is forcibly inserted to correct the deformation of the pipe line. It is characterized in that a rubber-like collar for supporting the cylinder at the center of the pipe is provided in contact with the inner circumferential surface of the passage.

[Action]

With the above-described structure, the repair tool for an underground conduit of the present invention has reached a point where the cylinder device is freely pulled by pulling with a wire into the underground conduit before the cable is pulled in, where insertion is hindered, a so-called defective point. At this time, this is forcibly corrected by the tapping action of the propulsion head to repair the conduit so that it can be pulled in. In addition, the collar supports the cylinder device in a stable manner to facilitate the repair work.

〔Example〕

An embodiment of the present invention will be specifically described below with reference to the drawings.

As shown in FIG. 1, the instrument used here has a cone-shaped propulsion head 1 at its tip, and a pulling wire 2 is connected to the front end of the propulsion head 1. A hammer rod 3 is continuously provided at the rear end of the propulsion head 1, and the hammer rod 3 is inserted into the cylinder 4. A hammer head 5 is provided at the rear end of the hammer rod 3, and a compression coil spring 6 is interposed between the hammer head 5 and the front end wall of the cylinder 4. A piston 7 is slidably fitted in the cylinder 4, and compressed air of about 7 kg / cm ² from the compressor 9 via a pressure-resistant hose 8 is inserted into the cylinder 4 from the rear end of the cylinder 4. Can be supplied.

The compressed air added into the cylinder 4 is leaked to the outside through the gap at the front end of the cylinder 4. Further, a rubber collar 10 is attached to the outer periphery of the rear portion of the cylinder 4 as a holder for contacting the inner peripheral surface of the existing pipeline A and holding the instrument at the center of the pipeline A. The rubber collar 10 is not limited to rubber and may be made of, for example, a synthetic resin having elasticity.

As shown in FIGS. 2 to 4, an instrument having such a structure is inserted into the underground conduit A so that the
The maneuvering wire 2 is inserted from one manhole B into the other manhole C between the manholes B and C which are sections. Then wire 2 from manhole C on the other side
When the device is taken out and pulled by a winch 11 or the like, the above-mentioned device is introduced from the manhole B into the underground conduit A.

Then, for example, when the defective portion in the locally deformed state as shown in FIG. 3 is reached, the propulsion head 1 hits the internal bulging portion X and its progress is hindered. At this time, compressed air is supplied from the compressor 9 through the pressure-resistant hose 8 into the cylinder 4, and the piston 7 strikes the hammer head 5. As a result, an impact force is applied to the propulsion head 1, and the tapered surface thereof pushes and spreads the inner bulging portion X outward.

At this time, the cylinder 4 tries to move rearward in the conduit A by the reaction force of the hammer head 5, but this movement is blocked by the rubber collar 10. Moreover, since the cylinder 4 is held at the center position in the conduit A by the rubber collar 10, the straightness of the instrument is improved. By repeating the beating as described above, the internal bulging portion X is forcibly corrected,
The propulsion head 1 is inserted. The flat deformed portion is similarly corrected.

Further, as shown in FIG. 4, the defective portion of the pipe joint portion in the stepped state is corrected to the parallel state by the tapping action on the propulsion head 1 as described above.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above in detail, the present invention pulls a propulsion head into a subterranean duct by a wire and places a propulsion head on the propulsion head at a defective portion to forcibly correct the duct. In addition, since a rubber collar is provided on the outer circumference of the cylinder, the underground pipeline may bend due to the looseness of the ground, vibration, etc., or the joint condition of the pipe joint may come off. If there is a step difference, or if the pipe body is damaged due to the claws of a chisel rock machine or excavator associated with other construction and a defective part appears, the pipe line can be quickly pulled by pulling the wire. It is possible to repair defective parts in a short time by moving to, and facilitate the subsequent cable pulling work. Moreover, due to the collar, the cylinder does not retract due to the reaction force of the propulsion head, and the tool is supported at the center position of the pipe line, and the repair work can be performed smoothly, efficiently and accurately. Play.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an example of a tool for realizing the repair tool of the present invention, and FIG. 2 is a vertical cross-sectional side view showing a state in which the above-mentioned tool is introduced into an underground pipeline, FIGS. 3 and 4. [Fig. 4] is a vertical cross-sectional side view showing a manner of using the device at a repair place. 1 ... Propulsion head, 2 ... Wire, 3 ... Hammer rod, 4 ...
Cylinder, 5 ... Hammer head, 6 ... Compression coil spring, 7 ... Piston, 8 ... Pressure-resistant hose, 7 ... Compressor, 10 ... Rubber collar, 11 ... Winch, A ... Underground pipeline,
B, C ... Manhole, X ... Internal bulge.

Front page continued (72) Inventor Takayuki Kamo 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Fumio Yabuhara 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Co., Ltd. (72) Inventor Motoyuki Koga 1-9-18 Nakamachi, Meguro-ku, Tokyo (72) Inventor Akira Shimada Four-share company, Hatsuko R & D Laboratories, Inc. 3-18 Daikan City, Kanagawa Prefecture (56 ) Bibliography Showa 51-11396 (JP, U)

Claims (1)

[Claims] 1. A cylinder device having a cone-shaped propulsion head at its tip is pulled by a wire and movably inserted into an underground conduit, and provided to the cylinder when the progress of the propulsion head is hindered. The piston is operated to give a forward tapping action to the propulsion head, and the propulsion head is forcibly inserted to correct the deformation of the pipe line. A tool for repairing underground pipes, which is provided with a rubber collar that contacts the surface and supports the cylinder in the center of the pipe.