JPS6182086A - Method of replacement construction of piping installed in ground - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is useful for installing electric wires underground or for other purposes when piping installed underground becomes old or has a small capacity. This invention relates to a construction method for replacing underground pipes with new pipes when it becomes necessary to replace them with large-capacity, thick pipes.

(Prior art) When installing electric wires underground, it is normal to bury piping to accommodate the electric wires underground. It is often done to install piping by burying pipes inside.

However, when this pipe becomes old or its capacity becomes insufficient, and it becomes necessary to replace it with a larger capacity and thicker pipe, it becomes necessary to replace the underground pipe with a new pipe. In the past, the conventional method was to excavate the ground again, remove the old pipes, and then install new pipes.

However, this is inconvenient because the ground has to be dug up again, which increases the labor and cost of construction work. However, if there is a road or a building on top of this pipe, the construction becomes even more complicated.

Since old pipes are available, it is hoped that a simpler and less expensive construction method can be developed to utilize them.

(Objective of the Invention) As described above, the present invention can easily and save construction costs by using old pipes, and can replace old pipes installed underground with new pipes without destroying road pavements, etc. above ground. The purpose of the present invention is to provide a method for replacing old pipes, and a head for crushing old pipes for use in this method.

(Structure of the Invention) The present invention involves press-fitting a head equipped with a crushing device for old pipes installed underground into the old pipes, and introducing a new pipe into the ground in contact with the head, or pushing this head forward. We provide a construction method for replacing old pipes installed underground with new pipes without damaging road pavements, etc. above ground, in addition to towing them with wires, etc. By attaching to the head a crushing fitting configured to open and close using mechanical force to crush old piping, a head is provided that makes the invention of the construction method even more effective.

(Example) The present invention will be described in detail below according to an example shown in the drawings.

FIG. 1 is a conceptual side view showing a state in which the present invention can be carried out, in which old telephone line piping 2 is buried in the ground 1, and manholes 3.4 for telephone line work are provided at both ends of the pipe 2. The top of the pipe is a road.
A drive device 6 supported by the pipe is installed, and the drive shaft 7 is rotated and pushed into the old pipe by the drive device 6, and a spatula 8 is attached to the tip of the drive shaft 7. In front of the head 8, as shown in a partial side view of FIG. 2, a number of blades 9,9' are provided as a device for crushing old pipes. Further, a new pipe 11 is attached to the rear part of the spatula through a joint part 10. If necessary, a guide protrusion 12 is provided at the front of the head, and a traction wire 14 is attached to the tip of the guide protrusion via a wire twist prevention device 13, and the wire 14 is attached to a support provided in another manhole 3. It is configured to be pulled by a traction device 17 via a pulley 16 supported by a frame 15.

Now, when the drive shaft 7 is driven and rotated by the drive device and press-fitted in the direction of the old pipe, and the head attached to the tip of the drive shaft 7 is pushed into the old pipe 2, the old pipe will be crushed. The new pipe 11 that was attached to the rear end of the head via the joint part 10
will be newly buried underground. Incidentally, the shafts are connected one after another via the connecting portion 7'. Further, the work progresses while adding new pipes 11 using couplings 11'.

Further, when the driving force of the shaft is insufficient, if necessary, the head 8 can be pulled by the pulling wire 14 to press the head 8 into the old pipe more forcefully and crush the old pipe.

FIG. 3 is a conceptual side view similar to FIG. 1 showing another embodiment, but in this embodiment, a head 8 for crushing old pipes is shown.
The head 8 is configured so that it is press-fitted with compressed air from an air pump 19 through a compressed air pipe 18 while vibrating in the front and rear direction, and a new flexible pipe 20 is attached to the rear end of the head. .

When using this device, compressed air from the compressed air pump 19 forces the head 8 through the compressed air pipe 18 into the old pipe. If the new flexible pipe 20 is attached to the head 8, the new pipe will be buried underground as in the previous embodiment, but in this embodiment, the old pipe is bent in the middle. It is effective for

FIG. 4 is a partial side view showing the configuration of another invention regarding the head, and is a hydraulic jack 2). 2) A crushing fitting 22, 22' configured to crush the old pipe by opening and closing it is installed, and the arm 23, 23' of the hydraulic pump 2), 2)' is operated by hydraulic pressure from a hydraulic pipe (not shown). By making a piston move,
The crushing fittings 22, 22' are configured to open and close.

When using this head, the old pipe can be more easily crushed, so that the pushing force by the drive shaft or hydraulic pipe and the pulling force by the pulling wire are reduced.

(Effects of the Invention) The present invention is a method for replacing underground pipes as described above, and a head used therefor. First, when installing new pipes, the ground is excavated once again and the pipes are installed. This eliminates the need for this, which greatly simplifies the construction process and reduces construction costs. Second, because the ground is not excavated,
Construction can be easily carried out even when there is road pavement or buildings on the pipe. Thirdly, if the embodiment in which the head is press-fitted using compressed air is used, even if the old pipe is bent, the construction work can be carried out effectively. In addition, in the invention of claim (3), since the old piping is crushed by the crushing metal odor that is opened and closed by mechanical force, the pressing force of the head can be small, and it can be driven with a correspondingly small power. Even if the piping is thick and strong, the scope of claims (
It is convenient for implementing the inventions 1) and 2).

[Brief explanation of the drawing]

Fig. 1 is a conceptual side view showing a state in which the present invention can be implemented;
3 is a conceptual side view similar to FIG. 1 showing another embodiment, and FIG. 4 is a side view partially in sectional view showing another configuration of the head.

Claims (3)

[Claims] (1) A head equipped with a crushing device for crushing old pipes installed underground is press-fitted into the old pipe, and a new pipe is introduced into the ground in contact with the head, which is installed underground. Piping replacement method. (2) A method for replacing underground piping according to claim (1), characterized in that the head is pulled from the front with a wire or the like. (3) A head for use in the construction method according to claim (1) or (2), wherein the head is equipped with a crushing metal fitting configured to open and close using mechanical force to crush old piping.