JPH0630527B2 - 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 kind of underground pipe is usually constructed by laying multiple pipes up and down in multiple steps between manholes, in multiple rows in the left and right, and in the form of collective alignment under the road, etc. 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 an underground pipeline, the pipe body may bend due to looseness 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 conduit of No. 2, 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 provides a cylinder device having a cone-shaped propulsion head at its tip, which is movably inserted into an underground pipeline by being pulled by a wire and when the progress of the propulsion head is hindered.
The 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. In addition to providing a rubber collar that contacts the peripheral surface and supports the cylinder at the center of the pipe,
The outer diameter of the cylinder between the propulsion head and the collar is smaller than the outer diameter of the propulsion head and the collar.

[Action]

With the above structure, the repair tool for the underground conduit of the present invention reaches a point where the cylinder device is freely pulled by pulling with a wire into the underground conduit before the cable is pulled in, and 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 so that repair work can proceed smoothly. Further, the device can be easily moved in the tube.

〔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, on the outer periphery of the rear portion of the cylinder 4, a rubber collar as a holder for holding the instrument in the center of the existing pipe.
10 is installed. The outer diameter of the cylinder 4 is smaller than the outer diameters of the rubber collar 10 and the propulsion head 1.

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 movably introduced from the manhole B into the underground conduit A.

For example, when it comes to a defective portion in a locally deformed state as shown in FIG. 3, the propulsion head 1 hits the internal bulging portion X and is prevented from proceeding. At this time, the pressure-resistant hose 8 from the compressor 9
Compressed air is supplied into the cylinder 4 via the, and the piston 7 strikes the hammer head 5. As a result, an impact force is applied to the propulsion head 1, and the internal bulging portion X
Push outward to expand. By repeating this tapping, the internal bulging portion X is forcibly corrected and 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.

At the time of the above-mentioned correction work, the equipment is the propulsion head 1 and the rubber collar.
Since the outer diameter of the cylinder 4 between 10 is formed thin, it can pass through even if the pipe path is slightly bent, and the movement in the pipe is easy.

〔The invention's effect〕

As described above in detail, the present invention inserts a cylinder device having a propulsion head that is pulled by a wire into an underground pipe, and at a defective portion, a hammering force is applied to the propulsion head to forcibly move the pipeline. It is for straightening, and a rubber collar is provided on the outer periphery of the rear end of the cylinder, and the outer diameter of the cylinder between the propulsion head and the collar is made thinner than the outer diameter of the propulsion head and the collar. From the underground pipe
When the pipe body bends due to the looseness or vibration of the ground, or the joint state of the pipe joint part is disengaged, and the claws of chisel rock excavators and excavators that accompany other construction work When the pipe body is damaged and a defective portion appears, the pipe line can be quickly moved by pulling the wire to repair the defective portion in a short time, which facilitates the subsequent cable drawing work. Also, due to the collar, the cylinder does not retract due to the reaction force of the propulsion head, but the equipment is supported at the center position of the pipe line for smooth and efficient repair work,
And it can be performed accurately. Further, since the outer diameter of the cylinder between the propulsion head and the rubber collar is formed to be small, it is possible to easily move the instrument in the tube.

[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 movably inserted into an underground pipeline by being pulled by a wire, and provided in 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 conduit, and the rear end of the cylinder is brought into contact with the inner peripheral surface of the conduit. With a rubber collar that supports the cylinder in the center of the tube,
An underground pipe repair tool, wherein an outer diameter of a cylinder between the propulsion head and the collar is formed to be smaller than outer diameters of the propulsion head and the collar.