JPH01150087A - Method of replacing existing main pipe with novel main pipe - Google Patents

Abstract

PURPOSE: To manufacture a pipe passage formed by jointing a pipe of predetermined length in the minimum area of possesion by detachably forming one section of a periphery of each pipe over an entire length of a radial direction. CONSTITUTION: A rear end surface of an old pipe 11 is hit by an excavator 7 to break the old pipe 11, and the excavator 7 is inserted into a space within the broken old pipe. One piece of insertion member 3 of a new pipe or the like is taken out while inserting the excavator, and an air hose 9 or the like is inserted into a long groove 2. And after that the insertion member is engaged inserting to assemble to a rear end of the excavator and to combine the excavator and the new pipe with a wire. The excavator and the new pipe are further proceeded together to lay the new pipe the like in the space within the broken pipe.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a method for replacing old pipes buried underground, such as water pipes and gas pipes, with new pipes, in particular, a method for replacing old and new pipes without digging up the ground surface. It concerns how to replace it.

[Conventional technology] When old pipes, especially cast iron pipes, have aged and become difficult to function after being buried, or when capacity is insufficient due to increased demand and it is necessary to replace them with new pipes, it is necessary to excavate the entire surface above ground. Digging out old pipes is expensive and labor-intensive, and it also obstructs surface traffic, so it is preferable to replace the old and new pipes without digging up the ground.

This is the case with the so-called pipe-in-pipe method, in which a new pipe is inserted into an old pipe underground, but the inner diameter of the new pipe is naturally smaller than the inner diameter of the old pipe, resulting in a reduction in gas and water transport capacity.

The prior art that forms the basis of the present invention is an invention that solves this problem: ``Method and apparatus for replacing existing main pipe with new main pipe.''
(Japanese Patent Publication No. 60-27873 @ Figures 4 to 6 of the publication) discloses this in detail.

FIG. 7 is taken from a catalog explaining the state of the invention when it is implemented on a commercial basis. Moreover, FIG. 8 shows a method improved from this.

In this conventional technology, a new pipe, etc. is attached to the rear end of an excavator, which has a body with a larger outer diameter than the old pipe, and as both move forward together, the tip of the excavator enters the old pipe, crushing it and filling the void. This is a method and device for expanding and replacing old pipes with new ones.

Based on the embodiments of this prior art shown in FIGS. 4 to 6, the contents will be described in more detail.

Excavation [7a] consists of a front part that enters the inner wall of the old pipe 11a and breaks this wall, and a rear part that is fastened to pull the new pipe etc. 1a. The front part has a head 14 that includes a cutting edge 13 as a cutting surface, and the front end is pulled forward by a winch (not shown) via a cable 10a that has been inserted through the tube row of the old pipe. It will be done.

The cutting edge 13 includes a blade 15, and at least one of the blades
One allows for radial outward rotation from the excavator to effectively fracture the walls of the old pipe.

In FIG. 5, the fluid (hydraulic pressure) pumped through the fluid pumping hose extending from the front through the inside of the old pipe pushes up the piston 16 installed in the head of the excavator, and this piston causes the blades 15 to be pushed up. One end is pushed up and the angle of inclination is increased, causing an effect of pushing the old tube 11a outward in the radial direction from the inner wall.

The excavator and the new pipes, etc. that will be connected later are moved forward mainly by the reaction force from the hitting of the air hammer 17, and as an auxiliary urging force by pulling from the front with a winch, and in some cases. The applicant has already proposed (patent application 1986)
1-159184), it is also possible to add a method of pushing in the new pipe from the rear end using a hydraulic jack.

[Problems to be Solved by the Invention] The present invention is based on the above-mentioned prior art and has developed related technologies so that it can be implemented more effectively.

As a practical problem, an air hose for operating an air hammer inside the machine is connected to the rear end of the excavator from the rear. It is also conceivable to connect an oil supply pipe that provides oil pressure for rotating the blades.

If the new pipe, etc. is a real long flexible plastic pipe, such pipes should be inserted into the pipe in advance and moved forward so that it can be bent as the new pipe moves forward. good. It can be said that FIG. 7 shows just such an embodiment. However, in such a case, a large working space is required behind the starting shaft. Generally, pipelines are buried under roads, so creating such a long work space will be a hindrance to surrounding traffic. Furthermore, in the example shown in FIG. 7, it is necessary to move the compressor as the excavator advances, which poses a hindrance to construction work. If you want to perform construction without moving the compressor, you will need to connect an air hose that is longer than necessary (at least 1.5 times the length from the starting hole to the destination hole). , the air supply efficiency decreases.

In order to reduce the work space, it is possible to use new pipes, etc. as a single pipe of the desired length, and to form a conduit by sequentially joining the single pipes as the excavator advances, as shown in Figure 8. In this case, the air supply to the excavator was stopped several times during the construction process to connect new pipes, dismantle and reconnect air hoses, etc.), and integrate the excavator and new pipes. Since the wires must be refastened, a large amount of work time is required, and work efficiency is extremely reduced. Furthermore, since hoses such as air hoses that are inserted into new pipes, etc. have a large number of joints, air supply efficiency is reduced and there is a risk of damage to the inner surface of the new pipe, etc. Furthermore, the use of a large number of expensive joints impairs economic efficiency.

In order to solve the above-mentioned problems, the present invention aims to provide a replacement method that can be constructed with a minimum occupied area and that can be constructed continuously with high efficiency.

[Means for solving the problem] The method of replacing an existing main pipe with a new main pipe according to the present invention is a method in which a new pipe, etc. is formed by joining single pipes of a desired length to form a conduit. Yes, and each single tube has a portion of its circumference that is I! over the entire length in the axial direction. The above-mentioned problem could be solved by being detachable.

More specifically, the removable member comprises a long groove cut out in a part of the tube periphery parallel to the tube axis direction, and a fitting piece that fits into the long groove, and further between the long groove and the fitting piece. By interposing a thin-walled elastic body, we have more clearly presented a means of solving the problem.

[Function and Examples] From FIGS. 1A, B, and C to FIG. 3A showing the embodiment.

The present invention will be explained in detail based on B (a), (b), (c), (d), and C.

Figure 1A is a front view of a single tube of desired length, Figure 8 is a side view,
Figure C is an enlarged view of the detachable part.A long groove 2 is provided in the main body 1 by cutting out a part of the circumference of the tube parallel to the tube axis direction, and a fitting piece 3 that fits there is separately manufactured. In the example in this figure, the long groove 2
Steps 4 are provided on the opposing sides of the fitting piece 3, and both steps are locked, and both members are screwed together using screws 5 (or fasteners such as bolts). If the new pipe is a liner and you want to insert the new pipe after replacing the old pipe with a -H liner, the method shown in Figure 1 will suffice. Since a water-sealing function is required for the pipe, a thin elastic body 6 such as rubber is interposed as shown in FIG. 2 to provide water pressure resistance necessary for water pipes and the like.

Further, depending on the case, adhesion using resin or the like may be used.

3A, B (a), (b), (c), (d), and C show the process of joining the single pipes shown in FIG. 1 to form a new pipe line.

The construction procedure exemplified here is as follows: 1. As shown in Figure 3A, the compressor 8 is installed in the excavator 7.
Connect the air hose 9 for driving the excavator and the cable 10 from the winch, move the excavator with its tip first, and use the excavator 7 to strike the rear end of the old pipe 11 using an air hammer installed inside the excavator. The old pipe 11 is broken, and an excavator is inserted into the gap within the broken old pipe.

2. As shown in Fig. 3B (a), (b), (c), and (d), during the excavator penetration, remove the fitting piece 3 from one of the new pipes 1 and insert the air hose 9 from the long groove 2. After inserting the hose, fit the fitting piece, attach it to the rear end of the excavator, and connect the excavator and the new pipe with wire etc.

As roughly shown in Figure 3C, the excavator and the new pipe are moved together and the new pipe is laid in the gap in the broken main pipe. At this time, if the hose reel 12 is used to rewind the air hose 9 to each desired length and then let it out, the work efficiency will be further improved and the site will be easier to organize.

3.Sequentially, using the same method as above, insert the air hose into the new pipe, etc. that will be connected next, connect it to the rear end of the new pipe, etc. that is being installed, and lay the new pipe, etc. from the starting hole to the destination hole. do.

4. If the new pipe has a liner, etc., after the liner etc. is installed in the predetermined position, install the new pipe by inserting and pushing.

By the above procedure, it is possible to connect new pipes, etc. one after another and install the new pipes, etc. from the starting shaft to the destination shaft, without stopping the excavator, that is, without stopping the air supply to the excavator.

[Effects of the Invention] Since the present invention has the configuration and operation described above, it solves the problems of the prior art shown in FIG. 7 by rationally utilizing the starting shaft which occupies a narrow area. The problems of the prior art shown in FIG. 8 were also solved, and all the troubles were finally solved.

Therefore, there is no need to repeat this example, which reduces work space, shortens work time, eliminates construction parts such as joints, protects the inner surface of new pipes, improves air supply efficiency, and makes cleaning work easier by using a hose reel. You can enjoy the effects of solving all of the issues that were initially considered, such as unique effects.

[Brief explanation of the drawing]

FIGS. 1A, B, and C are a front view, a side view, and an enlarged view of the attachment/detachment portion of the embodiment of the present application. FIG. 2 is an enlarged view of the attachment/detachment part of the embodiment in which an elastic body is interposed. Figure 3 A, B (a) (b) (c) (d) and C show the embodiment of the present application, A is a front view, B (a) (b) (c)
(D) is a front view showing changes over time in the new pipe etc. and the air hose, and C is a front view showing the next progress. 4 to 6 are front views showing different embodiments of the known technology that is the basis of the present invention, and FIGS. 7 and 8 are front views illustrating different construction states of the known technology. 1...Main body of new pipe, etc., 2...Long groove, 3
...Inset piece 4...Step, 5...
・Screw, 6...Rubber (elastic body) 7...
Excavator, 8... Compressor 9...
Air hose, 10... Cable 11...
・Old pipe

Claims (3)

[Claims] (1) A new main pipe or a liner to protect it (hereinafter referred to as “new pipe”) is attached to the rear end of the excavator, which has a body with a larger outer diameter than the existing main pipe buried underground (hereinafter referred to as “old pipe”). At the same time, pressurized air is supplied from the rear via a hose that passes through the inside of the new pipe and reaches the inside of the excavator. A method in which the air hammer inside the excavator is activated, the excavator and the new pipe move forward together, and the tip of the excavator enters the old pipe, crushing it and expanding the gap to replace the old pipe with the new pipe. In the new pipe, etc., a pipe line is formed by joining single pipes of a desired length, and a part of the circumference of each single pipe is freely attachable and detachable over the entire length in the axial direction. A method of replacing an existing main with a new main, characterized by: (2) The removable pipe comprises a long groove cut out in a part of the pipe circumference parallel to the pipe axis direction, and a fitting piece that fits into the long groove. How to replace the mains. (3) A new main pipe or a liner to protect it (hereinafter referred to as “new pipe”) is attached to the rear end of the excavator, which has a body with a larger outer diameter than the existing main pipe buried underground (hereinafter referred to as “old pipe”). pipes, etc.), and force them almost horizontally forward from the front and/or rear, and supply pressurized air from the rear via a hose, etc. that passes through the inside of the new pipes, etc. and reaches the inside of the excavator. A method in which the air hammer inside the excavator is activated, the excavator and the new pipe move forward together, and the tip of the excavator enters the old pipe, crushing it and expanding the gap to replace the old pipe with the new pipe. In the new pipe, etc., a pipe line is formed by joining single pipes of a desired length, and each single pipe has a long groove cut out in a part of the pipe circumference parallel to the pipe axis direction. and a fitting piece that fits into this long groove, the existing main pipe is removable, and a thin elastic body is interposed between the long groove and the fitting piece. How to replace.