JPH069401B2 - 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 a forward tapping action to the expanding head. In this case, the strength of the striking force of the expanding head is related to the piston stroke in the cylinder device, and there is a situation in which the cylinder device becomes long when mechanically exerting a required correction force. However, the buried pipeline is not necessarily linearly arranged, and may have a bend as a whole or locally, and in this case, the cylinder device becomes an obstacle and cannot be inserted. There's a problem. In addition, if the length of the cylinder device is restricted by design, the correction force will decrease, and if the duct is crushed significantly,
There is also a problem that this cannot be completely corrected.

[Means for solving problems]

The present invention has been made based on the above circumstances, a high frequency generating mechanism is provided in the portion of the diameter expanding head, and when the progress of the diameter expanding head is hindered, the defective portion is heated by operating the high frequency generating mechanism, Then, the tapping action of the cylinder device is added to provide a repairing method for an underground conduit for facilitating the thermal correction of a defective portion. To this end, according to the present invention, a cylinder device having a diameter-expanding head at the tip is inserted into an underground pipeline, and when the movement of the diameter-expansion head is hindered, a high-frequency generating mechanism is provided in the diameter-expansion head. While heating the inner wall of the passage, the cylinder device is operated to give a forward tapping action to the expanding head, and the expanding head is straightened and inserted to correct the deformation of the pipeline. To do.

【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 fitted in the cylinder 4, and a pressure-resistant hose 8 is inserted in 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 into the cylinder 4 is leaked to the outside through a gap at the front end of the cylinder 4. Also,
On the outer periphery of the rear portion of the cylinder 4, a holder (for example, a rubber collar) 10 for holding the instrument in the center of the existing pipe is attached. Further, a high frequency generating mechanism 11 for outputting a high frequency in the radiation direction is installed near the center of the tip of the diameter expanding head 1, and power is supplied to the high frequency generating mechanism 11 along a pressure resistant hose 8. It is adapted to be supplied from a generator 13 via a cable 12 arranged as described above. 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 the winch 14 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 expansion head 1 hits the internal bulging portion X and the progress thereof is hindered. At this time, the high frequency generating mechanism 11 is activated to heat the locally deformed portion X. When the portion X is sufficiently softened, compressed air is supplied from the compressor 9 into the cylinder 4 through the pressure resistant hose 8, and 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. The flat deformed portion is 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. Further, in order to accurately apply a high frequency to the bulging portion, the high frequency generating mechanism 11 is configured to be rotatable,
A camera may be incorporated into this to detect a defective portion from the outside, and the posture of the high frequency generating mechanism 11 may be controlled.

【The invention's effect】

As described in detail above, according to the present invention, the expanding head is put in the underground pipeline, high-frequency heating is performed at the defective portion, and the tapping force is applied to the expanding head to thermally and mechanically force the expanding head. It is possible to achieve straight line correction. So, for example,
Even if the ground is bent or deformed due to vibration, etc., it can be repaired in its buried condition. Moreover, by heating the deformed portion by high-frequency heating, it is possible to improve the effect of the tapping action by the diameter-expanding head and easily improve the correction effect. In addition, the cylinder device that gives the tapping force to the diameter-expanding head can be downsized, and even if the pipe line is bent as a whole or locally, this device can be smoothly inserted.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an example of a tool for realizing the repairing method of the present invention, FIG. 2 is a vertical sectional side view showing a state in which the above tool is introduced into an underground pipeline, and FIG. 3 is a repairing part. FIG. 6 is a vertical cross-sectional side view showing a usage mode of the device of FIG. 1 ... Expanding head, 2 ... Traction wire, 3 ... Hammer rod, 4 ... Cylinder, 5 ... Hammer head, 6 ... Compression coil spring, 7 ... Piston, 8 ... Pressure-resistant hose, 9 ... Compressor, 10 ... Retainer, 11 ... High frequency generating mechanism, 12 ... Cable, 13 ... Generator, 14 ... 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 stock companies, 3-18, Daiko City Kanagawa Prefecture.

Claims (1)

[Claims] 1. When a cylinder device having a diameter-expanding head at the tip is inserted into an underground conduit and the movement of the diameter-expanding head is obstructed, the inner wall of the conduit is heated by a high-frequency generating mechanism provided in the diameter-expanding head. At the same time, the cylinder device is operated to give a tapping action to the diameter-expanding head in the forward direction, and the diameter-expansion head is rectified and inserted to correct the deformation of the conduit. Repair method.