JP2590029B2 - Underground steel pipe crushing / new pipe pull-in device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground buried steel pipe crushing / new pipe pull-in apparatus for renewing a buried steel pipe and adding a new pipeline to a position close to the buried pipe using an underground buried steel pipe as a guide. is there.

[0002]

2. Description of the Related Art Conventionally, when renewing an underground buried pipe or adding a pipeline to a position near the underground buried pipe, an open-cutting method for excavating the entire construction section from the ground is often used. However, this excavation method causes problems such as road traffic obstruction, construction pollution such as noise and vibration, and construction difficulties due to the congestion of underground buried objects. No. 61-241456 (Japanese Unexamined Patent Publication No. Sho 63)
-96382).

FIG. 8 is a diagram for explaining the invention,
In the method of replacing the underground pipe 5 with a new pipe and adding a pipe to a position close to the underground pipe, the pipe shaft is connected to the end of the underground pipe 5 exposed in the starting shaft 1 as shown in FIG. A plurality of notches 7 are provided in the direction, and a rod tube 10 for preventing departure is attached to the tip of a tube crushing instrument 8 and a pilot tube 4 is attached to a rear portion. Then, as shown in FIG. 10a is engaged with a plurality of cutting blades 12 made of special hard steel provided with a pipe crushing device 8 shown in FIGS. The pipe 4 is pushed out through the pipe pushing device 3 in the direction of arrow A in FIG. 8 to advance the pipe crushing device 8 while crushing the underground pipe 5, and further, as the crushing of the underground pipe 5 progresses, the pilot pipe 4 After the pipe crushing device 8 reaches the reaching shaft 2 while adding The 砕器 device 8 is removed from the pilot tube 4. Further, as shown in FIG. 11, a pipe retracting device 14 is attached to the tip of the pilot pipe 4 on the arrival shaft 2 side, and one or a plurality of buried pipes 15 are attached to the rear end of the pipe retracting device 14.
The pipe pushing device 3 is operated in a direction opposite to the crushing of the underground pipe 5, and the pilot pipe 4 is drawn in toward the starting shaft to sequentially advance the pipe pull-in device 14, and a new pipe is located at a position close to the crushing pipe 16. Construction method and equipment for laying roads.

In the above-described apparatus, a pilot pipe is laid at the same time as a pilot pipe is laid while crushing an underground pipe by a cutting blade for pipe crushing. Although the cutting blade 12 made of special hard steel is installed as shown in FIG. 1, it is necessary to apply an excessive pushing force by the pipe pushing device, and it is uneconomical because a large-scale hydraulic mechanism must be used. . Although a plurality of cutting blades made of special hard steel are mounted, if even one of them is missing, the stability at the tip of the pipe crushing instrument cannot be maintained, and the pipe crushing must be interrupted. Further, the rod tube 10 for preventing the tip of the pipe crushing instrument 8 from deviating from the end thereof cuts into the step of the joint portion 13 of the underground buried pipe having many joints, which hinders the crushing. There is a problem that the reliability of the construction is low, for example, the construction must be interrupted when there is a bend. In addition, since the pipe retraction process is based on non-discharge consolidation, a change in the hardness and properties of the surrounding soil causes the entire pipe retraction device to rotate and twist, and the buried pipe subsequently laid is in a predetermined position. There is a problem that it is not buried.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in order to improve the above-mentioned drawbacks, and does not require an excessive pushing force for crushing a pipe, and is intended to ensure reliability when crushing a pipe. In order to avoid only contact with the pipe joint at the time of crushing of the pipe and to secure linear followability, the pipe crushing shape must be only one slit-shaped section beforehand. By penetrating a small-diameter rod pipe into the passage and crushing the buried pipe using the rod pipe as a guide, the buried pipe crushed body leading portion comes into contact with the pipe joint and the like, and does not hinder the crushing step. In addition, at the time of pipe retraction, when the hardness of the surrounding soil and changes in properties cause the entire pipe retraction device to rotate and twist,
Since the rolling can be corrected, the reliability of the construction can be improved, and the road is required for renewal of underground pipes and extension of pipes in the vicinity of underground pipes in long-distance construction sections where construction demand is expected to increase in the future. It is an object of the present invention to provide an apparatus for realizing an economical construction method using a non-digging method without digging.

[0006]

In order to achieve the above object, the present invention has a mounting portion at the front end for connecting to a rod pipe penetrating inside an existing underground steel pipe, and a rear end thereof. A cylindrical body having a connecting portion for attaching a new rod pipe, an arm-shaped protrusion provided on a side portion of the body, and a new pipe drawing device provided on the protrusion. The body is provided with a rotary cutting blade for crushing a steel pipe, a cylinder head for preventing rolling at one end of the retracting device, and a connecting portion for connecting a pilot pipe at the other end. SUMMARY OF THE INVENTION The gist of the present invention is a device for crushing and drawing a new underground steel pipe.

[0007]

According to the present invention, a rotary cutting blade is provided on a cylindrical body in an underground buried steel pipe crushing / new pipe drawing apparatus, so that the buried steel pipe can be easily crushed into a slit shape by the cutting blade. And has the effect of being able to retract a plurality of buried pipes.

[0008]

Embodiments of the present invention will be described below. It should be noted that the embodiments are merely examples, and it is needless to say that various changes or improvements can be made without departing from the spirit of the present invention.

FIGS. 1 to 4 are diagrams for explaining the method of construction, and FIGS. 5, 6 and 7 are diagrams for explaining an embodiment of the present invention.
Fig. 5 is an application to a buried steel pipe, Fig. 6 is a diagram for explaining a method of laying a newly installed pipe at a position close to an underground buried pipe, which is the final step, and Fig. 7 is a method for correcting a rotational torsion generated when the pipe is drawn. FIG. First, the method of the present invention will be described with reference to FIGS. 1 to 4 and FIGS. 5, 6, and 7.

As shown in FIG. 1, a starting shaft 17 and a reaching shaft 18 are constructed at both ends of the construction section (when using manholes, there is no need to install a shaft).
The main pushing device 19 using hydraulic pressure is installed and fixed to 7. At this time, the central axis direction of the rod pipe 20 and the central axis direction of the embedded steel pipe 21 are made to coincide. The rod pipe 20 has a diameter smaller than the inner diameter of the buried steel pipe 21, is a length that can be carried in from the starting shaft 17, and is a screw-in type with both ends threaded. The hydraulic hose 6 emerges from the main pushing device 19 and is controlled on the ground. As shown in FIG.
To the end of the rod tube 20 until the end of the rod tube 20 reaches.

As shown in FIG. 2, in a reaching shaft 18, after a buried steel pipe crushing / new pipe drawing-in device 22 is attached to an end of a rod tube 20, a main pushing device 19 installed and fixed to the starting shaft 17 is replaced by a rod. By operating the pipe 20 in the direction opposite to the penetration direction, the buried steel pipe crushing / new pipe drawing-in device 22 is pulled back to the starting shaft 17 side, and at the same time, the underground buried steel pipe is crushed into a slit shape. At this time, a new rod pipe 20a and a pilot pipe 23 are sequentially connected to the rear end of the buried steel pipe crushing / new pipe drawing-in device 22 in the arrival shaft 18 as the buried steel pipe crushing progresses. The buried steel pipe crushing / new pipe drawing-in device 22 will be described here with reference to FIG.

FIG. 5 is a view in which a buried steel pipe crushing / new pipe drawing-in device 22 is attached to an end of a rod pipe 20 previously penetrated into the buried steel pipe 21. The buried steel pipe crushing / new pipe drawing-in device 22 includes a connecting portion 28 for connecting to the rod pipe 20 in the buried pipe, a rotary cutting blade 30 for crushing the underground buried steel pipe into a slit shape, a circular columnar body 31, and the following. Rod connecting part 29 for connecting the rod pipe by means of a pipe, a protruding part 32 mounted in an arm shape from a body 31 to lay another temporary pipe 23 (hereinafter referred to as a pilot pipe) near the buried steel pipe, and a rod. It is composed of a hydraulic cylinder part 33 for correcting rolling during pipe movement propulsion, a hydraulic cylinder head 34 for drilling, and a connecting part 35 for connecting the pilot pipe 23 subsequently. The steel pipe buried underground is moved along with the return of the rod pipe 20 to the starting shaft 17 side by the main pushing device 1.
9 or a rotary cutting blade 3 driven to rotate inside the body 31
0 and crushed into a slit shape.
2, a new rod tube 20a and a pilot tube 23
Is laid. The rotary cutting blades 30 have different blade lengths, and employ a method of gradually cutting from the inside of the embedded steel pipe to the outside from the shorter blade, and the joint 21a is cut by the longer blade. At this time, along with the progress of tube crushing,
As shown in the figure, the new rod tube 20a and the pilot tube 23
Is added at the arrival shaft 18 so that the new rod pipe 20a is located at the position of the buried steel pipe and at a position close to the buried steel pipe.
And a pilot pipe 23 are laid. At the time of pipe retraction, the retraction device 22 generates a rotational twist around the rod pipe 20 due to a change in soil properties or the like. A method for correcting the rotational torsion angle will be described here with reference to FIG.

As shown in FIG. 7, a rotary torsion angle (hereinafter referred to as "rolling angle") correcting mechanism has an arm-shaped projection 32 attached to a body 31 connected to a rod pipe in a buried steel pipe.
Hydraulic cylinder part 33 integrally attached to the tip of the cylinder, a cylinder head 34 and a control hydraulic hose 41 attached via a guide pipe provided at the head of the cylinder part 33, a hydraulic drive circuit capable of driving the cylinder part 33, a retractor The tachometer 40 is provided at an appropriate position in the body of the vehicle to detect a rotational torsion angle during drilling and a signal cable 42 thereof.

The pipe drawing process is performed by operating the main pushing device 19 and pulling the buried steel pipe crushing / new pipe drawing device 22 back to the starting shaft 17 side. . Therefore, depending on the location of the retraction, the properties and hardness of the soil are different, and the retraction device is eccentric. Therefore, the rotational torsion is detected by the tachometer 40, and the cylinder head 34 is protruded in accordance with the rotational torsion angle (FIG. 7B), so that the reaction force from the soil by the cylinder head is increased. A method of controlling the posture of No. 22 and correcting the rotational torsion is adopted.

In FIG. 3, while the rod tube 20 is sequentially pulled back to the starting shaft 17 by the main pushing device 19, the new rod tube 20
a and the pilot pipe 23 are added at the reaching shaft 18, and these are drawn into the starting shaft 17 and laid. Over the entire construction section, a new rod pipe 20a is installed at the position of the underground pipe 21, and a pilot pipe 23 is installed at a position close to the underground pipe at a certain interval.

After the new rod pipe 20a and the pilot pipe 23 are laid, as shown in FIG.
Single pipe retractor 24 and multiple pipe collective retractor 2 respectively
5, and a new buried conduit 26 is connected to the rear end of the single pipe drawing device 24. In addition, a new buried pipeline 27 is connected to the rear end of the multiple pipe batch-in device 25.

FIG. 6 shows a method for connecting new pipes, a single pipe drawing apparatus 24 and a plural pipe collective drawing apparatus 25. The single pipe retracting device 24 is attached to the distal end of the new rod pipe 20a, and a joint 36 for connecting a new pipe is provided at the rear end thereof.
6 is connected. Further, a multiple pipe collective retractor 25 is attached to the tip of the pilot pipe 23 in parallel with the single pipe retractor 24, and a plurality of joints 37 for connecting new pipes is provided at the rear end thereof. A new buried pipeline 27 having the same diameter is connected.

Finally, as shown in FIG.
After connecting the new buried pipelines 26 and 27 to the four-pipe and multiple pipe batching-in apparatus 25, respectively, the main pushing device 19 in the starting shaft 17 is operated in the same direction as the buried pipe crushing direction, and the new rod pipe 20a and the pilot pipe are connected. 23 is returned to the starting shaft 17 side, and one or more new pipes are
1 and at a position close to the steel pipe 21 buried underground. The new pipes are sequentially connected in the reaching shaft 18 as the single pipe drawing-in device 24 and the multiple pipe collective drawing-in device 25 progress. In this manner, the single pipe retracting device 24 and the plural pipe collective retracting device 25 are connected to the starting shaft 17.
To complete the rehabilitation and renewal of underground steel pipes.

[0019]

As described above, according to the present invention, underground buried steel pipes can be used as a guide to easily renew underground pipes and increase pipelines close to buried pipes, while maintaining high construction reliability. Can be performed in a long time, so that the problem of the conventional equipment
There is an advantage that the correction of the torsion angle that occurs when the pipe is retracted can be solved. Furthermore, because the road is not dug up, construction pollution and road traffic obstruction caused by this can be avoided, and more economical renewal of buried steel pipes over long-distance construction sections, Pipes can be added.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a step of performing a rod pipe penetration prior to a crushing step.

FIG. 2 is a view for explaining a step of crushing underground steel pipes and drawing in new pipes according to the present invention.

FIG. 3 is a diagram illustrating a state in which a rod pipe and a pilot pipe are laid over an entire construction section.

FIG. 4 is a diagram illustrating a process of renewing a buried steel pipe and laying a pipeline in a position near the buried pipe.

FIG. 5 shows a buried steel pipe crushing / new pipe drawing-in apparatus of the present invention.

FIG. 6 is a view for explaining a method of renewing a buried steel pipe and adding a pipeline by a pipeline drawing device.

FIG. 7 is a diagram illustrating a method for correcting a rotational torsion that occurs when the pipe is retracted. (A) shows a rotation torsion angle correction mechanism, and (b) shows a method of correcting a rotation torsion.

FIG. 8 shows a conventional pipe extension method.

FIGS. 9A, 9B, and 9C each show a method of processing an end of a pipe.

FIGS. 10 (a), (b) and (c) each show a tube crushing device.

FIG. 11 shows a state in which a pipe retracting device is attached to the tip of the pilot pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Starting shaft 2 Arriving shaft 3 Pipe pushing device 4 Pilot pipe 5 Underground pipe 6 Hydraulic hose 7 Notch 8 Pipe crushing instrument 10 Departure prevention rod pipe 12 Cutting blade 13 Joint part 14 Pipe retracting instrument 15 Buried pipe 16 Crushing pipe 17 Start Vertical shaft 18 Reached vertical shaft 19 Main pushing device 20 Rod pipe 20a New rod pipe 21 Buried steel pipe 22 Buried steel pipe crushing / new pipe drawing apparatus 23 Pilot pipe 24 Single pipe drawing apparatus 25 Multiple pipe batch drawing apparatus 26 New buried pipe 27 New buried pipe Road 28 Connecting part 29 Rod pipe attaching part 30 Rotating cutting blade 31 Columnar body 32 Projecting part 33 Hydraulic cylinder part 34 Cylinder head 35 Connecting part 36 Joint 37 Joint 40 Tachometer 41 Control hydraulic hose 42 Signal cable

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazuhiro Watanabe 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-2-183089 (JP, A) JP-A-Hei 2-266185 (JP, A) JP-A-1-1544992 (JP, A) JP-A-63-96382 (JP, A) JP-A-62-296099 (JP, A)

Claims (1)

(57) [Claims] 1. A cylindrical body having a mounting portion at a leading end for connecting to a rod pipe penetrating into an existing underground steel pipe and a connecting portion at a rear end for mounting a new rod pipe. And an arm-shaped protrusion provided on a side portion of the body, and a new pipe retraction device provided on the protrusion, wherein the body is provided with a rotary cutting blade for crushing a steel pipe. An underground steel pipe crushing / new pipe drawing apparatus, characterized in that one end of the drawing apparatus is provided with a cylinder head for preventing rolling, and the other end is provided with a connection part for connecting a pilot pipe.