JPS62155388A - Method of replacing old pipe - 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] The present invention relates to a method for replacing an old pipe buried underground by replacing it with a new pipe.

[Conventional technology]

For example, in water supply facilities, projects to renew old pipes are being carried out, mainly by business entities with a long history, from the viewpoint of preventing water leakage due to aging, countermeasures against red water, earthquake countermeasures, etc.

Methods for replacing old pipes (hereinafter referred to as old pipes) include the trench-cut method, pipe-in-pipe method, PIM method, and the pipe replacement method disclosed in Japanese Patent Application Laid-Open No. 173492/1983. There is.

[Problem that the invention seeks to solve]

The trenchless method is a construction method in which all the old pipes to be replaced are excavated from the ground, dug up, and replaced with new pipes (hereinafter referred to as new pipes). This construction method not only interferes with the lives of surrounding residents, but also poses a problem with traffic, and also requires a large amount of soil, increasing construction costs and lengthening the construction period. These problems become more serious the more the construction site is a subcommittee (it is mainly the subcommittees that require renewal work).

The pipe-in-pipe method is a construction method in which vertical shafts are dug at both ends of the old pipe to be replaced, and the new pipe is inserted into the old pipe.

This construction method requires less space and amount of cutting than the open-cut construction method, but there is a problem in that only new pipes that are thinner than old pipes can be installed, and gaps are created between the old and new pipes. For this reason, if the old pipe is destroyed, there is a risk that surrounding earth and sand will flow into this gap and cause the ground surface to sink, but it is difficult to fill this gap with some kind of material in advance, and it is difficult to do so. This would require a large amount of construction costs.

The PIM method was developed in the UK, and involves inserting a compressed air impact crusher into the old pipe, crushing the old pipe with impact, and installing an iFr pipe with the same diameter as the old pipe by pulling it in with a cable. (Refer to Japanese Unexamined Patent Publication No. 120789). In this construction method, vibration.

There is a problem that the noise is intense and that only pipes with a small diameter of around 48 mm can be replaced.

The pipe replacement method disclosed in Japanese Patent Application Laid-Open No. 59-173492 involves pushing a drill pipe with a pipe expansion member at the tip into the old pipe to destroy the old pipe, and then pulling in the new pipe. It is. In the expansion part used in this construction method, the drill pipe, expansion member, and new pipe are rigidly connected, so each part is likely to be strained and damaged. In addition, since the expansion member is conical, it is inefficient in destroying the old pipe, and furthermore, the drill pipe, expansion member, and new pipe are rigidly connected, so
There are problems such as the fact that the force required to destroy the old pipe and the force required to draw in the new pipe cannot be separated, making it uneconomical.

As described above, all of the conventional construction methods have problems, and an early solution has been desired.

[Means for solving problems]

The present invention was made to solve the above-mentioned problems, and involves building shafts on both sides of the old pipe replacement method, installing a pulling machine in one of the shafts, and pushing a rod into the old pipe. At the same time, one end of the rod is gripped by the drawing machine, and a destruction jig is fixed to the other end of the shaft, and a hole-expanding jig is slidably attached to the rod, and a universal joint is attached to the hole-expanding jig. Connect the new pipe through the pipe, move the rod to the drawing machine while rotating it, destroy the old pipe with the breaking jig, and push the pieces into another board with the hole expanding jig. This invention provides a method for replacing old pipes by forming a passage and laying a new pipe in the passage.

〔Example〕

First, before explaining the old pipe replacement method of the present invention, the IXi device necessary for carrying out the present invention will be explained with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a retractor, to which a rod 2 is detachably attached, and has the function of moving (retracting) the rod 2 in the axial direction while rotating it.For example, a horizontal poling machine can be used. can. 2 is a rod made by connecting small rods divided into predetermined lengths with screws, etc., and is connected to the drawing machine 1 in order to rotate or pull in the breaking jig 3 and hole expanding jig 4 attached to the tip. It is used to transmit torque and axial force. 3 is a breaking jig fixed to the rod 2, and as shown in FIGS. 2(a) and 2(b), it has a diamond-shaped side surface with tapered portions 31 at the front and rear, and an elliptical cross section. , a large number of protrusions 32 are provided on the outer surface.

As shown in FIGS. 2(a) and 2(c), reference numeral 4 denotes a hollow, approximately hexagonal hole-expanding jig having a tapered portion 41 at the front and rear, and a circular cross-section. 2
is slidably inserted, and is prevented from being removed by a stopper 21. 5 is a universal joint that connects the rod 2 pushed through the hole expanding jig 4 and the cap 71 attached to the new pipe 7; 6 is a lubricant injection machine;
A lubricant 61 is supplied to reduce friction.

Next, an embodiment of the old pipe replacement method according to the present invention will be described. In addition, in this example, the diameter of the old pipe 8 is 200φ, and the diameter of the new pipe 7 is
The diameter of the rod 2 was 200φ, and the diameter of the rod 2 was 50φ.

(1) Construct vertical shafts 10 and 11 on both sides of the old pipe replacement section. The distance between the shafts 10,11 can be extended as long as the old pipe 8 is straight or remains straight enough to allow insertion of the rod 2, but is usually 30 to Som. Further, the dimensions of the vertical shaft 10.11 are determined according to the dimensions of the pulling machine 1 and the new pipe 7.

(2) A lead-in 811 is installed in one shaft 10. In addition,
Heavy & as needed! 12 to serve as an anchor.

(3) While sequentially connecting the small rods from inside the shaft 10 to the small rods with a pushing jig attached to their tips, insert them into the old pipe 8 using the pulling machine 1 or manually.

(4) When the tip of the rod 2 comes out into the shaft 11, remove the pushing jig, fix the breaking jig 3 to the rod 2, and
Thereafter, the hole expanding jig 4 is slidably attached, and finally, the new tube 7 with the cap 71 attached to the tip of the other rod 2 is connected via the universal joint 5.

(5) Grip the rod 2 with the pulling device 1 and pull it in the direction of the arrow while rotating the rod 2. At this time, when the second small rod from the end reaches the retraction 4!11, the small rod at the end is removed and taken out of the shaft 10.

(6) As the zero tube 2 rotates and is pulled in, the breaking jig 3 fixed thereto is also rotated and pulled in, and due to the wedge action of the tapered part 31 of the breaking jig 3 and the protrusion 32, the old pipe 8 is It is destroyed as shown in Figure 3.

In addition, if the strength of the old pipe 8 is high and it is difficult to break it statically, both rods 2 in the space of the hole expansion jig 4 shown in FIG.
, the distance between the two! As shown by the broken line, the breaking jig 3 is pushed back in the direction of the arrow and pulled back in the direction of the arrow to impact the old pipe 8.

(7) On the other hand, the hole expansion jig 4 that follows the destruction jig 3 pushes the fragments of the old pipe 8 destroyed by the pulling into the surrounding ground (shown by 8a in Fig. 1), and pushes the pieces of the old pipe 8 destroyed by the pulling into the surrounding ground (shown by 8a in Fig. 1), and Securing a passage 13 for

At this time, since the rotation of the rod 2 is blocked by the hole expanding jig 4, the new pipe 7 connected thereto does not rotate and moves only in the axial direction. Furthermore, since the new pipe 7 is connected to the hole expanding jig 4 via the universal joint 5, the movement of the hole expanding jig 4 is relaxed and transmitted to the new pipe 7.

(8) In this way, the rod 2 is rotated and pulled in by the drawing machine 1, and the new pipe 7 is drawn into the passage 13 via the universal joint 5. In this case, the rods 2 pulled in the direction of the arrow are removed in the shaft 10 one by one, small rods at a time.
The new pipes 7 are pulled out and connected into the shaft 11 one after another.

Note that since a cap 71 is attached to the tip of the new pipe 7, debris from the old pipe 8, earth and sand, water, etc. are prevented from flowing into the new pipe 7. Also, from the lubricant injector 6 to the cap 7
If the lubricant 61 is injected into the ground through the lubricant injection port provided in the pipe 1, friction when the new pipe 7 is drawn in can be reduced.

Although the embodiments of the present invention have been described above, the old pipes targeted by the present invention are pipes that can be destroyed by the wedge action, impact, and protrusion of a breaking jig, and specifically, ordinary cast iron pipes, high-grade cast iron pipes, etc. Pipe, PVC pipe.

Examples include asbestos cement pipes.

Further, the new pipe targeted by the present invention is preferably a pipe whose joint portion has the same strength as the base material, such as a steel pipe, a vinyl chloride pipe, or a polyethylene pipe. Furthermore, the diameter of the new pipe can range from smaller than the old pipe to the same diameter or even slightly larger. Furthermore, it is preferable that the new pipe be a pipe with anti-wear measures, and the new pipe may be made into a sheath pipe into which the main pipe is inserted.

In the above explanation, the rod 2 is slidably pushed through both sides of the hole expanding jig 4, and a new hole is inserted into the rod at the tip via the universal joint 5.
g; 7 is connected, but only the rod on the destruction jig 3 side is slidably inserted, and the new pipe 7 is connected to the universal joint 5. It may also be directly connected to the hole expanding jig 4 via the cap 71. Furthermore, although the above embodiment describes the case where a water pipe is replaced, the present invention can also be implemented in the case of replacing a gas pipe, an oil pipe, a sewage pipe, and the like. The shape, dimensions, etc. of other parts are not limited to the above embodiments, and can be changed as appropriate without departing from the gist of the present invention.

〔Effect of the invention〕

As is clear from the above description, the present invention has the following remarkable effects.

(1) There is no need to excavate the ground surface along the entire length of the old pipe, and only two vertical shafts will be constructed, so there will be no inconvenience to surrounding residents or obstruction of traffic. Additionally, since less soil is excavated, construction costs are lower and the construction period is shorter.

(2) The diameter of the new pipe can be selected from a wide range of diameters, and even small diameter pipes can be constructed. The use of especially strong rods made it possible to work on new pipes with large diameters.

(3) Since the vibration and noise are not strong, there is no risk of causing pollution problems.

(4) According to the example, the oval shape of the destruction jig makes it easier to destroy the old pipe, and the provision of the hole expansion jig makes it possible to move only the destruction jig in the axial direction. Therefore, when the old pipe is difficult to destroy, it is now easier to destroy the old pipe by moving it in the axial direction and applying an impact force. Furthermore, since the new pipe is connected to the hole expanding jig via the universal joint, the tip of the new pipe will not be damaged.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining the present invention in detail, FIG. 2(a) is an enlarged sectional view of an embodiment of the main part, and FIG.
), (e) is a cross-sectional view taken along line C-C in (a), and FIG. 3 is an explanatory diagram of the operation of the present invention. 1: Pulling machine, 2 Nirod, 3: Destruction jig, 4: Hole expansion jig, 5: Universal joint, 7: New pipe, 8: Old pipe, 10, 11: Vertical shaft, 13: Passage, 21: Stopper, 31.41: Taper part, 32: Projection.

Claims (1)

[Claims] Construct shafts on both sides of the old pipe replacement section, install a pulling machine in one shaft, insert a rod into the old pipe, have one end gripped by the pulling machine, and destroy the other end in the other shaft. A hole expanding jig is slidably attached to the rod, a new pipe is connected to the hole expanding jig via a universal joint, and the rod is rotated by a pulling machine. The old pipe is moved to the side, the old pipe is destroyed with the destruction jig, the fragments are pushed into another board with the hole expansion jig to form a passage, and a new pipe is laid in the passage. Replacement method.