JPH0255676B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for transporting underground pipes such as gas pipes and water pipes without excavating their buried parts.

[Conventional technology]

Gas pipes, water pipes, etc. that have been buried underground for many years need to be replaced with new pipes due to their age and other reasons. This replacement work is normally carried out using the trenchless method, but if the pipes are installed under the road surface, it is desirable to carry out the work without trenching due to traffic conditions and other reasons.

As a trenchless method for transferring buried pipes, a method in which a new small-diameter pipe is drawn into an existing old pipe and transferred is widely used and is known as a general construction method.

We also proposed a method in which a shaft is formed at both ends of the old pipe, both ends of the old pipe are exposed and cut, and the old pipe is pulled out from within the shaft by jacking, or removed by extrusion and transfer. has been done.

As a transfer method for replacing cast iron pipes, Japanese Patent Publication No. 60-27873 describes a method in which a new pipe is transferred and laid while crushing the cast iron pipe with a crusher, and this method is shown in Figure 8. As shown in the figure, the crusher 26 enters the cast iron pipe 31, and the blades 27, 27 expanded by the ram 28 crush and expand the cast iron pipe 31, and then the crusher 26 crushes the new pipe 18.
This method involves pulling in, transporting, and laying.

[Problem that the invention seeks to solve]

Among the conventional methods using trenchless methods, the method of drawing a small-diameter new pipe into the old pipe and transferring it is relatively easy to transport a long-distance buried pipe. There was a problem that the cross-sectional area was reduced and the flow rate in the new pipe was reduced.

In addition, the method of transporting and removing old pipes by jacking has a very large frictional resistance between the old pipes and the soil, and jacking alone cannot be an effective means to break the adhesion between the two.

The method of crushing the cast iron pipe 31 shown in FIG. 8 leaves fragments 32 of the crushed cast iron pipe 31 underground, making it impossible to recover the old pipe.
In addition, since the fragments 32 are left underground, if it is necessary to replace the buried pipe again in the future, there is a risk that problems will occur if a trenchless transfer method is used.

The present invention has been made in view of the above matters,
A technical problem is to provide a method for transporting underground piping that can easily transport and remove old pipes or easily transport and install new pipes.

In addition, the present applicants have already used an excitation device to
An application has been filed for a method for reducing the frictional resistance of a buried drain pipe by applying vibration to the buried pipe to loosen the bond between the buried pipe and the soil, and the present invention was invented after further research based on the invention of the aforementioned application. .

[Means for solving problems]

As shown in FIG. 1, the first invention exposes both ends of the buried old pipe 1, and
One end of the old pipe 1 is pressed while applying an impact with the impact type propulsion device 3, and the impact type propulsion device 3 is pulled from the outside of the other end of the old pipe 1 with the winch 10. Push pipe 1 forward and remove old pipe 1 from the buried part.
We adopted a method of transporting underground pipes by pushing out and transporting the materials without excavation.

The second invention, as shown in FIGS. 1 to 3, exposes both ends of the buried old pipe 1, and connects one end of the old pipe 1 to an impact type propulsion machine. 3 while applying pressure and pushing the old pipe 1 forward by pulling the impact type propulsion device 3 from the outside of the other end of the old pipe 1 with the winch 10, and
A new pipe 18 is connected to the rear end of the impact type propulsion device 3 and pulled in by the impact type propulsion device 3, and the old tube 1 is pushed out from the buried part and transferred, and then the new pipe 18 is drawn into the hole 17 and transferred and laid. The method of transporting underground pipes was cut and cut.

The third invention, as shown in FIGS. 1, 6, and 7, exposes both ends of the buried old pipe 1, and then removes one end of the old pipe 1. While applying pressure with the impact type propulsion device 3,
Push the old pipe 1 forward by pulling the impact propulsion device 3 with the winch 10 from the outside of the other end of the old pipe 1, push out and transfer the old pipe 1 from the buried part, and then push out the old pipe 1. The new pipe 18 is pushed into the hole 17 after it has been transferred using the impact propulsion device 3, and the new pipe 18 is transferred and installed without excavation.

[Effect]

In the first invention, one of the exposed ends of the buried old pipe 1 is pressed while applying an impact with the impact type propulsion device 3, and the impact type propulsion device 3 is pulled with the winch 10. The adhesion force between the old pipe 1 and the soil is extremely weakened by the vibration, and the old pipe 1 is pushed forward. Then, the impact type propulsion device 3 further pushes the old pipe 1, and pushes out and transfers the old pipe 1 from the buried part.

The second invention is to push the old pipe 1 forward as described above, and to push the new pipe 18 to the rear end of the impact type propulsion machine 3.
The new pipe 18 is transferred and laid into the hole 17 after the old pipe 1 was pushed out and transferred.

The third invention is to insert the new pipe 1 into the hole 17 using the impact type propulsion device 3 after the old pipe 1 has been pushed out and transferred as described above.
8 is pushed and transferred, but since the hole 17 has already been formed, the new pipe 18 is pushed and transferred relatively easily.

〔Example〕

Depending on changes over time or purpose of use, old pipes that are subject to removal include cast iron pipes, ductile pipes, and steel pipes, and among these, cast iron pipes are the most troublesome type of pipe. The reason for this is that the joints of the cast iron pipes are shaped like an inko, which has an outer diameter that is 40% larger than the main pipe's outer diameter, and the frictional resistance with the surrounding soil is significantly greater. Furthermore, since it is cast iron, it has the disadvantage of being brittle compared to other types of pipes, and there is a concern that it may buckle due to impact. Therefore, it is clear that if the cast iron pipe can be replaced, other pipe types can also be replaced. Therefore, the replacement of cast iron pipes will be explained using an example.

First, in preparation for underground pipe transfer, as shown in Figure 1, the vicinity of both ends of the old cast iron pipe 1 to be removed is excavated to form one as a starting shaft A and the other as a destination shaft. B, and cut to expose both ends of the old tube 1. The starting shaft A is a working shaft for sending out the impact type propulsion device 3 and the new pipe 18, and the arrival shaft B is a working shaft for recovering the old pipe 1 and the impact type propulsion device 3. Furthermore, for the starting shaft A, it is sufficient to allow a 1m margin for the length of the new single pipe to be laid, and for the arrival shaft B, it is sufficient to provide a 1m margin for the length of the impact propulsion unit 3. The width is 1.5m for both starting shaft A and arrival shaft B, and the depth is the height of the pipe bottom + 0.3m.
That's fine.

In the first embodiment of the invention, first, a wire rope 12 is drawn into the old pipe 1 using a piano wire or a steel rod having a threaded joint as a messenger. Next, an impact type propulsion machine 3 with an outer diameter approximately equal to the outer diameter of the old pipe 1 is installed on the pedestal 9 in the launch shaft A, and connected to the wire rope 12 of the winch 10. Attach 3 to the mouth of old tube 1.

In this case, as shown in FIGS. 4 and 5, a head receiving jig 7 that matches the shape of the head 6 of the impact propulsion device 3 is attached to the mouth of the old pipe 1 that receives the largest impact force. The outer periphery of the old pipe 1 is tightened with a halved outer circumferential band 8, and the old pipe 1 is restrained from the inside and outside to prevent buckling.

On the other hand, a winch 10 is installed in the reaching shaft B and connected to the reaction force framework 11.

The impact type propulsion machine 3 is an air-driven type that is sent out by a compressor 5, and is a machine that penetrates underground and moves by itself using the frictional force between the body of the impact type propulsion machine 3 and the soil as a reaction force, and is used to remove buried buried objects. This applies impulsive vibration and pressing force to the old pipe 1.

When the compressor 5 is driven with the impact type propulsion unit 3 attached to the mouth of the old pipe 1, the impact type propulsion unit 3 is started, and when the winch 10 of the reaching shaft B is started at the same time, the old pipe is A vibration pressure input is applied to the old pipe 1, and the old pipe 1 starts to move, and the impact type propulsion device 3 penetrates the soil while pushing and transporting the old pipe 1. When the impact type propulsion device 3 moves forward by the length of the single pipe of the old pipe 1, the sliding surface 16 along the outer periphery of the joint part 2 of the old pipe 1 spans the entire length of the buried part of the old pipe 1. forms a continuous hole 17, and the force required to subsequently push out and transfer the old pipe 1 becomes extremely small.

An expander 4 having an outer diameter slightly larger than the outer diameter of the joint 2 of the old pipe 1 is attached to the rear end of the impact propulsion device 3, and this expander 4 opens into the launch shaft A. After penetrating the hole 17, the impact type propulsion device 3 moves forward while expanding the hole 17 with the expander 4.

On the other hand, in the reaching hole B, the extruded old pipe 1 is cut and recovered, and the impact type propulsion device 3 is also recovered in the reaching hole B. In this example, it was confirmed that the extrusion force due to dynamic pressure input is much more powerful than static pressure.

In the embodiment of the second invention, the old pipe 1 is pushed forward as in the embodiment of the first invention, and the expander 4 of the impact type propulsion device 3 opens the hole 1 in the starting shaft A.
7, the compressor 5 is stopped, a new pipe 18 with the same nominal diameter as the old pipe 1 is inserted into the expander 4, and the impact type propulsion machine 3 and the new pipe 18 are inserted into the expander 4.
are integrally connected by a wire 19.

When the compressor 5 is driven again, the new pipe 18 is pulled forward by the impact propulsion device 3 within the hole 17 expanded by the expander 4. In this case, there is a margin between the new pipe 18 and the hole 17, and the pulling force on the new pipe 18 may be small. Therefore, new pipe 1
No reaction force is required to draw in and transport 8.

On the other hand, in the reaching hole B, the extruded old pipe 1 is cut and recovered. Finally, the impact type propulsion device 3 is recovered and the replacement of the buried pipe is completed.

In this example, an old pipe 1 made of cast iron with a diameter of 150 mm is extruded and transferred, and a new pipe 18 made of PVC pipe with a diameter of 150 mm is transferred for 20 m.
I was able to pull it in and transport it. This underground pipe transfer method is suitable when the diameter of the new pipe 18 is the same as the old pipe 1 or smaller than the diameter of the old pipe 1, and the maximum diameter of the new pipe 18 is smaller than the hole 17. If so, the type of lead-in pipe does not matter.

In the embodiment of the third invention, the old pipe 1 is pushed out and transferred as in the embodiment of the first invention, and then,
As shown in Figure 6, the new pipe 1 has a larger diameter than the hole 17.
8 into contact with the end of the hole 17, and then this new pipe 1
Attach a blind-shaped striking surface 20 to the rear end of the compressor 8, insert the head 6 of the impact type propulsion device 3, integrate the new tube 18 and the impact type propulsion device 3 with a lever block 21, etc., and drive the compressor 5. The new pipe 18 penetrates into the soil while cutting around the hole 17. When one new pipe 18 penetrates into the soil, the impact type propulsion device 3 and striking surface 20 are removed from the new pipe 18, the next new pipe 18 is welded and set again, and the new pipe 18 is driven.

In this case, the impact propulsion device 3 simply moves back and forth within the launch shaft A, and no reaction device is required.

In this method, since the hole 17 corresponding to the outer diameter of the joint portion 2 of the old pipe 1 is pre-drilled, the penetration force of the new pipe 18 can be small.

When the new pipe 18 of a predetermined length is transferred and the installation is completed, the earth and sand accumulated in the new pipe 18 are removed and the work is completed.

Furthermore, if buckling of the old pipe 1 is expected from the beginning, this can be dealt with by filling the old pipe 1 with mortar and extruding and transporting the old pipe 1 as a pile body.

〔Effect of the invention〕

Since the present invention adds vibration due to impact to the static pressure, the punching force for transferring the tube is extremely increased.
This made it possible to install new pipes while removing old pipes in one step.

Additionally, it has become possible to replace old pipes with new pipes that have a larger diameter than the old pipes.

Furthermore, there are many types of pipes that can be applied, the equipment is extremely simple, including both the starting and arriving shafts, and the construction speed is extremely fast.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of the underground piping transfer method of the present invention and the device used, and Figures 2 and 3 are examples of the underground piping transfer method of the second invention and the device used. FIG. 4 is a partial vertical cross-sectional view of the main part of the device used, FIG. 5 is a cross-sectional view thereof, and FIGS. 6 and 7 are a pipe transfer method according to the third invention. FIG. 8 is a diagram illustrating a conventional example. 1... old pipe, 3... impact type propulsion machine, 10... winch, 17... hole, 18... new pipe.

Claims (1)

[Claims] 1. Both ends of the buried old pipe are exposed, and one end of the old pipe is pressed while applying an impact with an impact-type propulsion machine, and the other end of the old pipe is A method of transporting underground pipes without excavation, in which a winch is used to pull an impact-type propulsion machine from the outside of the end of the pipe to push the old pipe forward, pushing the old pipe out of the buried part and transporting it. 2. Expose both ends of the buried old pipe, press one end of the old pipe while applying impact with an impact propulsion machine, and push the other end of the old pipe outward. Use a winch to pull the impact type propulsion machine and push the old pipe forward, connect the new pipe to the rear end of the impact type propulsion machine, and pull it in with the impact type propulsion machine.
A trenchless underground piping transfer method in which the old pipe is pushed out from the buried part and then the new pipe is pulled into the hole and transferred and laid. 3. Expose both ends of the buried old pipe, press one end of the old pipe while applying impact with an impact propulsion machine, and push the other end of the old pipe outward. The old pipe is pushed forward by pulling the impact type propulsion machine with a winch, and the old pipe is pushed out from the buried part, and then the new pipe is pushed and transferred by the impact type propulsion machine into the hole where the old pipe was pushed out and transferred. A trenchless method for transporting underground piping.