JPH069409B2 - Underground pipeline repair method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a method for repairing an underground conduit that serves as a lead-in conduit for a cable for telecommunications installed underground, and more specifically, the pipe main body is broken or the pipe joint part is detached due to secular change after the installation. For repairing underground pipes that attempt to secure an insertion space for inserting cables, etc. by correcting the pipes at defective points where it became impossible to pull in cables, etc. It is a thing.

[Prior art]

This type of underground pipe is usually constructed by laying multiple pipes up and down in multiple steps over manholes, in multiple rows on the left and right, and laying them underground underneath a road in a grouped arrangement. When 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. ing.

[Problems to be Solved by the Invention]

By the way, in such an underground pipe, the pipe main body may be bent or broken due to the looseness or vibration of the ground, etc., over a period of time after installation, resulting in a step difference. In addition, for the same reason, the pipe joint portion may cause a disengagement phenomenon at the joint portion to be bent or stepped. In addition, the pipe body is locally damaged by the claws of a rock drill or excavator associated with other construction, causing flat deformation, and defective parts such as locally recessed inside appear, resulting in an empty basement. When a new cable is drawn into the pipeline, there is a problem that the cable cannot be drawn in. Therefore, before the cable is pulled in, the instrument is passed through the underground conduit, and when it reaches a place where insertion is hindered, a so-called defective part, it is forcibly corrected and the conduit is made into a retractable state. Proposed to be repaired. For this, a diameter-expanding head with a cone-shaped or special shape at the tip is adopted, and when this is inserted into the underground pipeline, when the progress of the diameter-expansion head is hindered, The arranged cylinder device is operated to give the expanding head a tapping action in the forward direction. When treated in this way, there are cracks in the correction area,
It may be fragile and need reinforcement.

[Means for solving problems]

The present invention has been made based on the above circumstances, in which a straightening portion is softened by heating, a reinforcing pipe is put therein and heated and welded, and further, the reinforcing pipe is expanded by a diameter expanding head. Therefore, it is intended to provide a method for repairing an underground pipe to completely reinforce the correction part. To this end, according to the present invention, a cylinder device having a diameter-expanding head at its tip is inserted into an underground conduit, and when the movement of the diameter-expanding head is hindered, the cylinder device is operated to operate the diameter-expanding head. In the one in which the tapping action is given to force the insertion, and the deformation of the pipe line is corrected, the above-mentioned correction part is heated by the heating / welding means before the expanding head, and the reinforcing pipe is heated and welded at the above-mentioned correction part, The expanding head is characterized in that the reinforcing tube is inserted so as to expand.

【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 expanding head 1 at the tip, and a pulling wire 2 is connected to the front end of the expanding head 1. is there.
A hammer rod 3 is connected to the rear end of the diameter expanding 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 inserted into the cylinder 4, and a pressure hose 8 is inserted into the cylinder 4 from the rear end of the cylinder 4.
Compressed air of, for example, about 7 kg / cm ² can be supplied from the compressor 9 via the. The compressed air added to the cylinder 4 is leaked to the outside through a gap at the front end of the cylinder 4. Also,
A holding tool (for example, a rubber collar) 10 for holding the instrument in the center of the existing pipe is attached to the outer periphery of the rear portion of the cylinder 4. In addition, a gas welding mechanism is provided in front of the tip of the expanding head 1.
11 are installed. The gas supply to the gas welding mechanism 11 is performed by the gas supply hose arranged along the pressure-resistant hose 8.
The gas is supplied from a cylinder 13 provided outside the pipe via 12 and the control of gas ignition and extinguishment thereof can be realized by remote control means (appropriately). As shown in FIG. 2 and FIG. 3, an instrument having such a structure is inserted into the underground pipeline A so that
Between the manholes B and C which are sections, one manhole B is connected to the towing wire 2 and the other manhole C is connected.
Insert into. Then, when the pulling wire 2 is taken out from the manhole C on the opposite side and pulled by a winch 4 or the like, the above equipment is introduced into the underground conduit A from the manhole B. For example, as shown in FIG. 3, when it reaches a defective portion in a locally deformed state (dent) in the conduit, the diameter-expanding head 1 hits the internal bulging portion X and its progress is hindered. At this time, the gas welding mechanism 11 is activated to heat the locally deformed portion X. Then, when the portion X is sufficiently softened, the compressed air is supplied from the compressor 9 via the pressure-resistant hose 8 to the cylinder 4
Supplied inside, the piston 7 strikes the hammer head 5. As a result, an impact force is applied to the diameter-expanding head 1, and the tapered surface thereof pushes and expands the internal bulging portion X. By repeating this heating and tapping, the internal bulging portion X is forcibly corrected and the diameter-expanding head 1 is inserted. Flattened portions are similarly corrected. In addition, in order to detect deformed parts such as internal bulging parts,
The sensor may be arranged at the expanding head or in front of it. In addition, it is recommended that the attitude control of the gas welding mechanism 11 can be controlled remotely so that the gas flame can be accurately hit from the gas welding mechanism 11 toward the bulging portion. Should be able to be done visually. Further, if a crack or a fragile state is expected in the straightening portion X, the diameter expansion head 1 is replaced and the reinforcement pipe Y is introduced into the underground conduit A by this diameter expansion head 1. And Fig. 4
As shown in the order of (a) to (c), first, the gas welding mechanism
At 11, the straightening portion X is heated to be softened, and in this state, the reinforced pipe Y is sent under the straightening portion X by the expanding head 1 and
Is heated by the gas welding mechanism 11 and is further welded to the inner wall of the pipeline at the edge. Thereafter, the expanding head 1 is again made to strike with the cylinder 4 to expand the reinforcing pipe Y, and the reinforcing pipe Y is fixed in close contact with the correction portion.

【The invention's effect】

As described above in detail, the present invention is to insert a diameter expansion head into an underground pipeline, heat it when correcting a defective portion, weld a reinforcing pipe, and expand the reinforcing pipe with the diameter expansion head. As a result, the effect of being able to completely reinforce the cracks and fragile portions of the correction portion is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an example of a device for realizing the repairing method of the present invention, FIG. 2 is a vertical cross-sectional side view showing a state in which the above-mentioned device is introduced into an underground pipeline, FIG. 3 (a), (b) is a vertical cross-sectional side view showing the usage of the device at the repair location, Fig. 4 (a),
(b), (c) is a vertical side view showing a mode of use of the device for realizing the reinforcement at the repaired place. 1… Expanding head, 2… Traction wire, 3… Hammer rod, 4… Cylinder, 5… Hammer head, 6… Compression coil spring, 7… Piston, 8… Pressure hose, 9… Compressor, 10… Retainer, 11 ... Gas welding mechanism, 12 ... Gas supply hose, 13 ... Cylinder, 14 ... Winch, A ... Underground pipeline,
B, C ... Manhole, X ... Internal bulging portion, Y ... Reinforcement tube.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Kamo 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Fumio Yabuhara 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Motoyuki Koga 1-9-18 Nakamachi, Meguro-ku, Tokyo (72) Inventor Akira Shimada Four-share company, Hatsuko Development Technology Research Co., Ltd., 3-18 Daikan City, Kanagawa Prefecture In-house

Claims (1)

[Claims] 1. A cylinder device having a diameter-expanding head at its tip is inserted into an underground conduit, and when the progress of the diameter-expanding head is obstructed, the cylinder device is operated to strike the diameter-expanding head. In the case of applying and forcibly inserting and straightening the deformation of the conduit, the straightening portion is heated by the heating / welding means in front of the expanding head to heat and weld the reinforcing pipe at the correcting portion, and the expanding head is also used. Is a method for repairing underground pipes, which is characterized by inserting the reinforcing pipe so that it expands.