JPH01182688A - Buried pipe changing method - Google Patents

Abstract

PURPOSE:To make the changing work of a buried pipe by means of nonexcavation performable by making an excavator, breaking an obsolete pipe and then spreading it wide, advance forward by a pusher by means of compressed air and a winch, and inserting a new pipe into the obsolete pipe. CONSTITUTION:An excavator 1, breaking an obsolete water pipe 2 buried in the ground and then spreading it wide, is advanced forward into the obsolete water pipe 2 by a pusher being advanced forward with impact force by dint of compressed air and a winch 14 set up in and around a carry-over shaft 13. Simultaneously with this, a new water pipe 17 attached to a rear part of the pusher is inserted into the obsolete water pipe 2 broken and spread wide by a pushing device 23 being set up in a starting shaft 5 and using a winch 26. In consequence, replacement for the buried pipe can be done over a long block interval.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a buried pipe replacement method for replacing old pipes such as water pipes buried underground with new pipes without digging.

[Prior art] Conventionally, as the above-mentioned buried pipe replacement method, for example,
A method described in Japanese Patent No. 27873 is known.

This method involves installing a new main or a liner to serve as a protective sleeve for the new main at the rear end of the excavator, which has a body with an outside diameter larger than the outside diameter of the existing main, and then break the existing main by moving the excavator along with the new main or liner into the existing main and breaking the gap to allow the new main or liner to enter the broken main. If a liner is used in which a new main or liner is placed within the gap and maintained by the body within the tube, the new main is further placed into the liner after the liner is in place.

[Problem to be solved by the invention 81 However, according to the above-mentioned conventional buried pipe replacement method, a liner is attached to the rear end of the excavator to serve as a new main pipe or a protective sleeve for the new main pipe. In addition to requiring a large amount of propulsion to move the liner, if the replacement work section becomes long, the speed of the replacement work will decrease due to friction between the new main pipe or liner and earth and sand.
There is a problem that makes it difficult to carry out replacement work in the above-mentioned sections.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a buried pipe replacement method that can perform buried pipe replacement work at an alarming speed and over a long section without excavation.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has an excavator installed in the excavator that pushes and spreads broken old pipes buried underground, and uses the impact force of compressed air. This is a construction method in which a new pipe is advanced through the old pipe using a propulsion unit installed in the starting shaft and a winch installed near the arrival shaft, and at the same time a new pipe is inserted into the broken and stretched old pipe using a pushing device installed in the starting shaft and using a winch. be.

[Function] According to the above means, the advance of the excavator and the insertion of the new pipe are performed by a propulsion device mounted on the excavator, a winch installed near the reaching shaft, and a pushing device installed in the starting shaft and using the winch. done individually.

[Implementation example] An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a schematic cross-sectional view of the buried water pipe replacement method.

In the figure, 1 is an excavator that breaks an old water pipe 2 made of asbestos buried underground and then stretches it wider than before. A first propulsion device 4 that uses the impact force of compressed air is housed in a cylindrical casing 3 having a larger outer diameter. The propulsion unit 4 receives compressed air from a compressor 6 installed on the ground near the starting shaft 5 (see Figure 1) through an air hose 7 that passes through the new water pipe, which will be described later, and is movably installed inside the body. The excavator 1 is moved forward intermittently by moving a piston (not shown) forward impulsively and then retracting the piston relatively gently using compressed air.

A breaking blade 8 is provided at the tip of the casing 3 (the right end in FIG. 2) for cutting the old water pipe 2 into two in the diametrical direction, and then pushing the pipe into two pieces wider than the conventional diameter. As shown in FIGS. 2 and 3, the breaking blade 8 includes a conical body 9 whose base portion has the same diameter as the casing 3, and a conical body 9 that is implanted along the generatrix opposite to the conical body 9 in the diametrical direction. , from the top of the cone.

Further, the extended V-shaped cutting blade 10, the locking protrusion 11 provided on the double-edged light having approximately the same width as the half circumference of the old water pipe 2 on the cutting blade 10, and the locking protrusion 11 provided on the cutting blade 10 on the conical body 9 are orthogonal to the cutting blade 10 on the conical body 9. It consists of an expanding blade 12 that is planted along opposing generatrix lines and has a V-shape that is narrower than the cutting blade 10. And, in order to advance the excavator 1 together with the propulsion device 4, the tip of the cutting blade 10 has a
A wire locking hole IB is provided for locking the end of the wire lobe 15 (see FIG. 1) of the electric winch 14 installed in the reaching shaft 13.

On the other hand, as shown in FIG. 2, a protective tube 18 is fitted into the rear end of the casing 3 for inserting and protecting the tip of a new water pipe 17 made of vinyl chloride. Inside the protective tube 18,
A flanged guide tube 19 is concentrically arranged, which is slidably fitted into the rear end of the casing 3 via a flanged portion 19a, through which the air hose 7 is inserted, and which guides the tip of the new water pipe 17. . This flanged guide tube 19 is provided with a wire locking portion 19b that locks an end portion of a wire lobe 20 that links the excavator 1 with a pushing device to be described later. Further, inside the protection tube 18, a pipe support 21 in the shape of a circular plate is fixed, through which the flanged guide tube 19 is movably inserted, and against which the tip of the new water pipe 17 comes into contact. Then, the tube holder 21 and the flange 19
A compression coil spring 22 is fitted in the flanged guide tube 19 between the pistons 1 and 2, which absorbs and relieves the impact of the propulsion device 4 when the piston retreats.

As shown in FIG. 1, the starting shaft 5 is equipped with a pushing device 23 for inserting a new water pipe 17 into the old water pipe 2' which has been broken and expanded by the excavator 1.

The pushing device 23 is provided to be able to support the new water pipe 17 and a relatively long guide stand 24 arranged on the extension line of the old water pipe 2 in the starting shaft 5, and is movable in the longitudinal direction of the guide stand 24. The movable base 25 is supported, and the movable base 25 is provided at the front end (the right end in FIG. 1) of the guide base 24.
5 and a loop-type electric winch 26 that reciprocates along a guide table 24.

That is, as shown in FIG. 4, the guide stand 24 is provided in an H-shaped cross section with a guide bottom 24a near the middle of the height extending from near the tip to near the rear end. On the rear end wall of the guide stand 24, there is a wheel 2B, which is rotated by a wire rope 27 of a loop-type electric winch 26 which is connected in a loop via a movable stand 25 etc. as will be described later. The drum 28a of the electric winch 26 is pivoted opposite to the drum 28a of the electric winch 26, which is rotated forward and backward by a drive mechanism that does not rotate. On the guide bottom 24a of the guide stand 24, the movable stand 25 projects upward from the guide stand 24 and is supported slidably. Mobile table 25
A rectangular parallelepiped-shaped spacer accommodating portion 29 is provided at the upper rear side (left side in FIG. 4) and partially opens upward and forward. The spacer accommodating portion 29 is provided with a notch 30b that partially opens upward and forward, and that allows the wire rope 20 to pass through a partition wall 30a that partitions the front and back and restricts upward movement. A spacer 30 (only a short spacer is shown in FIG. 4) is removably provided. In order to protect the rear end of the new water pipe 17 and the spacer 30 itself, the spacer 30 has an elastic body 31.3 such as rubber attached to the front of the partition wall 30a and the rear side of the spacer 30.
It is equipped with 2. Then, the wire rope 20 inserted into the new water pipe 17 together with the air hose 7 is restricted from moving upward by the notch 30b, and then the pushing device 2
3 and the excavator 1, a post 33 erected on the upper rear side of the movable table 25 is provided so as to be tensionable by a wire tensioner 34.

A second propulsion device 35 that uses the impact force of compressed air, like the first propulsion device 4, is housed in the lower part of the movable table 25. The second propulsion device 35 is a loop-type electric winch 2
In order to increase the insertion speed when the insertion speed of the new water pipe 17 decreases due to ) is moved forward with an impact, and the piston is moved back gently using compressed air. The second propulsion device 35 is housed in the lower part of the moving table 25 with its forward movement restricted by the stopper plate 37.
A U-shaped linking tool 38 is attached to the rear wall of the rear wall provided with a hose hole 39 through which the rear end of the second propulsion device 35 and the air hose 36 are inserted, so as to sandwich the rear side of the second propulsion device 35. It is movably housed with a compression coil spring 40 interposed therebetween. Front wire locking protrusions 41 are provided on both sides of the connecting tool 38.
On the other hand, a rear wire locking protrusion 42 is provided at the lower rear end of the movable table 25. The front wire locking protrusions 41 and the rear wire locking protrusions 42 are provided with one fork-shaped end of the wire rope 27 of the electric winch 26, which is wrapped around the drum 26a several times to prevent slipping. The other ends of the wire ropes 28 are respectively locked, and this locking causes the wire rope 27 to be linked in a loop, and the compression coil spring 40 to be in a compressed state.

In addition, in FIG. 1, 43 is a wire drum that winds up the wire rope 15 pulled by the electric winch 14.

To replace the old water pipe 2 with a new water pipe 17 using the above-mentioned equipment, first, the wire rope 15 let out from the wire drum 43 is inserted into the old water pipe 2 from the reaching shaft 13 side, and the wire rope 15 is replaced with a new water pipe 17. The end of the wire is locked in the wire locking hole 16 of the excavator 1'' located in the starting shaft 5. Then,
The tip of the breaking blade 8 of the excavator all is inserted into the old water pipe 2, compressed air is supplied from the compressor 6 to the first propulsion device 4, and in parallel, the electric winch 14 is operated to intermittently operate the excavator 1. to move forward. As the excavator 1 moves forward, the old water pipe 2 made of asbestos is broken by the cutting blade 10 and the expanding blade 12, and then expanded by the cone 9 to be larger than the conventional diameter. The repair pipe made of vinyl chloride (not shown) used has a breaking blade 8.
is stretched diametrically by a cutting blade 10 of 2.
After being cut into pieces, it is bent by the expanding blade 12 and the cone 9 and expanded to a larger diameter than the conventional diameter. When the repair pipe is broken, the locking protrusion 11 provided on the cutting edge of the cutting blade I (l) protrudes outside the cut repair pipe, so that the excavator 1 receives a force that causes it to retreat due to the restoring force of the repair pipe. Never.

At the same time as the excavator 1 cuts and expands the old water pipe 2, as shown in FIGS.
The rear end of the new water pipe 17 covered with heat-shrinkable tubes 44 in five orders is supported by the short spacer 30 on the movable table 25 of the pushing device 23, and the electric winch 2B is operated to remove the new water pipe 1.
The distal end of the pipe 7 is inserted into the old water pipe 2' which has been broken and expanded, and is brought into contact with the pipe holder 21 in the protection tube 18 of the excavator 1. When the new water pipe 17 inserted as the excavator 1 moves forward is inserted about halfway, the electric winch 26 is reversed to move the moving table 25 backward, and the rear end of the new water pipe 17 is moved using a long spacer. It is supported on a stand 25 and inserted by operating an electric winch 26. 1 new water pipe 1
7 is inserted to the vicinity of the rear end, move the moving table 25 backward, and cover the rear end of the new water pipe 17 with a heat shrink tube 44 fitted with a socket protection pipe 45 shown in FIGS. 5 and 6. The rear end of the next new water pipe 17 is supported on the movable table 25 by the short spacer 30, and the electric winch 2B is operated, and the rear end of the new water pipe 17 that precedes the socket 17a of the next new water pipe 17 is Continue inserting the new water pipe 17.

During the insertion, the new water pipe 17 made of vinyl chloride is covered with the heat-shrinkable tube 44, so that it is not damaged by the broken and stretched old water pipe 2' or by earth and sand. In addition, since the joints between the new water pipes 17 are covered by a truncated conical socket protection pipe 45, there is no risk of dirt or the like getting into the joints and damaging the rubber gaskets 46 (see Figure 5). In addition, the frictional resistance during insertion is reduced.

When the new water pipe 17 is inserted repeatedly and the insertion speed decreases due to increased frictional resistance due to earth and sand,
After connecting the excavator 1 and the pushing device 23 by tensioning the wire rope 20 by the wire tensioning machine 34, the pushing device 2
Compressed air is supplied from the compressor 6 to the second propulsion device 35 mounted on the moving table 25 of No. 3 to increase the insertion speed.

New water pipe 17 where excavator 1 comes out into reaching shaft I3 and leads
When the front end of the pipe reaches the reaching shaft 13, the replacement of the buried water pipe is completed.

In the above embodiment, a method for replacing a buried water pipe has been described, but the present invention is not limited to this, and can be used, for example, to replace a buried sewer pipe or other buried pipe.

Further, the vinyl chloride pipe is not limited to the case where it is used as a repair pipe for asbestos pipes, and all the pipes may be vinyl chloride pipes, and in this case, they are broken to increase the amount of transportation.

[Effects of the Invention] As described above, according to the present invention, the advancement of the excavator and the insertion of a new pipe are performed by the propulsion machine mounted on the excavator, the winch installed near the reaching shaft, and the winch installed in the starting shaft. Since the pushing is performed individually by the used pushing device, compared to the conventional method,
Buried pipes can be replaced at extremely fast speeds and over long distances.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figure 1 is a schematic cross-sectional view of the underground water pipe replacement method, Figure 2 is a partially omitted and cross-sectional side view of an excavator, and Figure 3 is a cross-sectional side view of the excavator. 4 is a side sectional view of the pushing device and the propulsion device, FIG. 5 is a side sectional view of the connection part of the new water pipe, and FIG. 6 is a front view of the socket protection pipe.

Claims (1)

[Claims] (1) An excavator that ruptures and spreads old pipes buried underground is mounted on this excavator and advances inside the old pipe using a propulsion device that uses the impact force of compressed air and a winch installed near the access shaft. At the same time, this buried pipe replacement method is characterized by inserting a new pipe into the broken and stretched old pipe using a pushing device installed in a starting shaft and using a winch.