JPH0368974B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for repairing underground conduits that serve as lead-in conduits for telecommunications cables, etc., laid underground.Specifically, the pipe body may break or the pipe joint may come off due to changes over time after installation. This relates to a repair method that attempts to secure a space for cables, etc. by rectifying defective conduits, which have become uneven due to the above-mentioned methods, making it impossible for cables to be drawn in, while still being buried.

[Technical problem of the invention]

This type of underground conduit usually consists of multiple pipes arranged in multiple rows vertically and horizontally across manholes, and is laid underground under roads and other locations. During the initial installation, extra conduits that are expected to be added in the future are laid at the same time, and the cables to be routed are drawn into any empty conduit and laid. It's on. Incidentally, over time after installation, underground pipes may become bent or broken due to loosening of the ground, vibration, etc., resulting in uneven levels. In addition, for the same reason, pipe joints may come off and become bent or uneven, and pipe joints may be damaged by the claws of rock drills or excavators during other construction work. If the main body is locally damaged and flattened, or if defective areas such as local inward depressions appear and a new cable is being drawn into an empty underground conduit, the cable There were some inconveniences such as the inability to pull in.

[Purpose of the invention]

The present invention was proposed in order to solve the above-mentioned disadvantages.The present invention was proposed in order to solve the above-mentioned disadvantages by passing an instrument through the underground conduit prior to pulling in the cable, and reaching the place where insertion is obstructed, that is, the so-called defective place. Time,
The present invention aims to provide a repair method for underground conduits in which the conduit is forcibly corrected and the conduit is repaired to a state in which it can be retracted.

[Structure of the invention]

For this purpose, the present invention provides that a cylinder device equipped with a propulsion head having a cone shape or a certain special shape at the tip is inserted into an underground pipeline, and when the advancement of the propulsion head is blocked, the cylinder The present invention is characterized in that a piston provided in the piston is moved to apply a forward striking action to the propulsion head, and the propulsion head is forcibly inserted through the piston to correct unevenness in the conduit.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, the instrument used here is equipped with a cone-shaped propulsion head 1 at its tip, and a traction wire 2 is connected to the front end of the propulsion head 1. A hammer rod 3 is connected to the rear end of the propulsion head 1, and the hammer rod 3 is inserted into a 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 piston 7 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 a compressor 9 through a pressure-resistant hose 8 to the inside. The compressed air applied to the cylinder 4 is leaked to the outside through a gap at the front end of the cylinder 4. Further, a rubber collar 10 is attached to the rear outer periphery of the cylinder 4 as a holder for holding the instrument in the center of the existing pipe. As shown in Figures 2 to 4, in order to insert a device with such a configuration into underground pipe A, between manholes B and C, which is one section of underground pipe A, one manhole B is inserted. Then, the traction wire 2 is inserted into the other manhole C. When the wire 2 is taken out from the manhole C on the opposite side and pulled by a winch 11 or the like, the above-mentioned device is introduced into the underground conduit A from the manhole B. For example, when the propulsion head 1 reaches a defective location of local deformation as shown in FIG. 3, it hits the internal bulge X and is prevented from advancing. At this time, compressed air is supplied from the compressor 9 through the pressure 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 its tapered surface pushes the internal bulge portion X outward. By repeating this tapping, the internal bulge X is forcibly corrected and the propulsion head 1 is inserted through it. The flat deformed portion is also corrected in the same manner. In addition, as shown in Figure 4, for defective parts of the pipe joints that are in an uneven state, the propulsion head 1 as described above
The hammering action corrects the parallel state.

【Effect of the invention】

As described in detail above, the present invention places a propulsion head in an underground conduit and forcibly corrects the conduit at a defective location by applying a striking force to the propulsion head. As mentioned above, if the main body of the underground pipe bends due to loosening of the ground or vibration, or if the connection of the pipe joint comes loose and the pipe becomes uneven, or if other construction work is being carried out, Excellent repair effect, such as when the main body of the pipe is damaged by the claws of the rock drill or excavation machine and defective parts appear, the pipe can be repaired, making subsequent cable pulling work easier. can be raised.

[Brief explanation of drawings]

Fig. 1 is a vertical side view showing an example of the equipment for realizing the repair method of the present invention, Fig. 2 is a longitudinal side view showing the state in which the above equipment is introduced into an underground pipe, and Fig. 3
Figures 4 and 4 are longitudinal sectional side views showing how the instrument is used at the repair site. 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, 1
0... Rubber collar, 11... Winch, A... Underground pipe, B, C... Manhole, X... Internal bulging part.

Claims (1)

[Claims] 1. When a cylinder device equipped with a propulsion head having a cone shape or a certain special shape at the tip is inserted into an underground conduit, and the progress of the propulsion head is obstructed,
Repair of an underground pipeline characterized in that a piston provided in the cylinder is operated to apply a forward knocking action to the propulsion head, and the propulsion head is forcibly inserted through the pipeline to correct deformation of the pipeline. Construction method.