JP6851203B2 - Construction method of underground piping in boulders - Google Patents

Description

The present invention relates to a method of constructing an underground pipe, and particularly relates to a method of constructing an underground pipe in a boulder zone where a large number of boulders are present.

When constructing underground pipes in the ground, it is common to excavate the ground with a backhoe to form a groove, drop the pipes, and then backfill with sand or soil.

When an attempt is made to excavate a pipe groove for piping in a zone where there are a large number of boulders as shown in FIG. 7, there are the following problems.
(1) The boulders in the part (a) where the groove is to be formed are removed by taking them into the bucket while raising them with the claws of the backhoe. It is difficult to raise the nails and it takes time to excavate.
(2) In order to eliminate meshed boulders, it is necessary to eliminate boulders outside the planned groove formation range, which are not originally necessary. Actually, the excavated ditch becomes wide as shown in (b), and the amount of excavated soil Will increase, and the amount of backfill soil will increase as well.
(3) If the bond between the boulders is loosened by applying an unreasonable force or shaking with a backhoe to eliminate the boulders that have meshed with each other, the restraint from the ground on the boulders other than the boulders that were being removed becomes loose and unstable. It ends up.
(4) If the boulder becomes unstable, there is a risk that it will fall while the pipe is being dropped after excavation and hit the worker.
(5) Unstable boulders may fall during excavation, and the backhoe may fall into the ditch together with the boulders.
(6) The ground around the ditch may loosen and sink after construction.
(7) The boulders on the side surface of the groove may fall into the groove during backfilling and damage the piping.

An object of the present invention is to provide a method for constructing an underground pipe in a boulder zone, which can efficiently eliminate boulders in a ditch and construct an underground pipe.

The first invention of the present application made to achieve the above object is a method of constructing underground piping in a boulder zone, which comprises a cutting step of making slit-shaped cuts in the ground along both sides of a groove to be formed. The pipe consists of a groove forming step of taking out soil and boulders between the two cuts to form a groove, dropping a pipe into the formed groove, a pipe dropping step, and backfilling the groove, and a backfilling step. see write down while winding the protective plate made of steel plate in the groove, the notch width is characterized by a diameter substantially the same width of the protective plate wound around the pipe, underground pipes in boulders areas Provide the construction method of.
The second invention of the present invention is the method of constructing an underground pipe in a boulder zone of the first invention, wherein the notch is made by rotating a rotary cutter having a carbide tip attached to the outer periphery of a disk at high speed. Provided is a method of constructing underground piping in a boulder zone.
The third invention of the present invention is the method of constructing underground pipes in the boulder zone of the first invention or the second invention, in which the soil and the boulders are taken out by a tilt fork with a bucket, which is composed of a lower bucket and an upper movable fork. Provided is a method of constructing underground piping in a boulder zone, which is characterized by performing.

According to the present invention, at least one of the following effects can be obtained by means for solving the above-mentioned problems.
(1) Since the boulders are crushed and cut by making cuts on both sides of the groove to be formed, the boulders in the ditch can be efficiently removed and the excavation efficiency is improved.
(2) Since it is not necessary to eliminate boulders outside the groove width, the amount of excavated soil and backfill soil can be reduced, and the time required for construction can also be reduced, so that the cost can be greatly reduced.
(3) Since the boulders are crushed and cut, the restraint from the ground on the surrounding boulders is not loosened, and there is no risk of the ground subsidence after construction.
(4) Since there is no loosening of the surrounding boulders, there is no danger of falling during construction, and construction can be carried out safely.
(5) When the backfilling is compacted, even if the surrounding boulders move, there is no risk of the piping being damaged by the protective plate.
(6) Even if the pipe comes into contact with the side surface of the cut groove at the time of dropping, there is no risk of the pipe being damaged by the protective plate.

Construction drawing of underground piping construction method in boulder zone Explanatory drawing of the cutting process Explanatory drawing of groove formation process Explanatory drawing of a tilt fork with a bucket used in the groove forming process Explanatory drawing of piping drop process Explanatory drawing of the state where the piping is protected by the protective plate Explanatory drawing of excavation ditch in the conventional underground pipe construction method

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[1] Construction of underground piping in a boulder zone The construction method of underground piping in a boulder zone of the present invention is for arranging the pipe 1 at a predetermined depth in a place where there are a large number of boulders S in the ground. is there.
In the present invention, the pipe 1 is arranged in the ground by breaking and cutting the boulder S to form a groove 2 to drop the pipe 1 and backfilling the groove 2 with earth and sand 3 (FIG. 1).

[2] Construction procedure <1> Cutting step Two slit-shaped cuts 21 are made in the ground according to the width of the groove 2 to be formed (FIG. 2).
The distance between the two notches 21 is the width of the groove 2 to be formed, and is substantially the same as the diameter of the pipe 1.
The notch 21 cuts by rotating a rotary cutter with a carbide tip attached to the outer circumference of the disk at high speed.
Since the cutting is performed by the rotary cutter, the boulder S can be fractured and cut according to the shape of the groove 2 to be formed.

<2> Groove forming step The soil and boulders S between the two notches 21 are taken out to form the groove 2 (FIG. 3).
Since the boulder S is fractured and cut by a rotary cutter, only the boulder S in the groove 2 can be taken out, and the excavation efficiency is improved.
Further, since only the boulders S in the groove 2 are taken out, the surrounding ground is not loosened. Therefore, there is no risk of the groove 2 collapsing during construction, and construction can be performed safely.
The boulder S in the groove 2 is taken out by a tilt fork 41 with a bucket, which is attached to the construction machine 4 and is composed of a lower bucket 411 and an upper movable fork 412 (FIG. 4).
Since only the boulders S in the groove 2 having a diameter substantially the same as the diameter of the pipe 1 are taken out, the construction machine 4 is small and does not damage the surrounding ground.
If the tilt fork 41 has a bucket, the soil in the groove 2 can also be taken out by the lower bucket 411.

<3> Piping drop step The pipe 1 is dropped into the groove 2 formed by the groove forming step.
Since the side surface of the groove 2 is cut by a rotary cutter, the boulder S having a sharp angle may be exposed. However, even if the pipe 1 is a polyethylene pipe, the pipe 1 is shown in FIG. By winding the protective plate 5 made of a steel plate in this way, there is no risk that the pipe 1 will come into contact with the pipe 1 and be damaged.

<4> Backfilling process After dropping the pipe 1, the groove 2 is backfilled with earth and sand 3 and rolled to achieve the state shown in FIG. 1, and the work is completed. Since the amount of backfill soil is only inside the groove 2, the time required for the work can be reduced and the cost can be greatly reduced.
Even if the boulders S around the groove 2 move during compaction, there is no risk of the pipe 1 being damaged by the protective plate 5.
Further, since the groove 2 is formed by fracture cutting with a rotary cutter, the restraint from the ground on the surrounding boulders S is not loosened, and there is no possibility that the ground will sink after construction.

1 Piping 2 Groove 21 Notch 3 Sediment 4 Construction equipment 41 Tilt fork with bucket 411 Lower bucket 412 Upper movable fork 5 Protective plate S Rolling stone

Claims (3)

It is a construction method of underground piping in a boulder area.
A cutting process that makes slit-shaped cuts in the ground according to both sides of the groove to be formed,
The groove formation process, in which the soil and boulders between the two cuts are taken out to form a groove,
The pipe dropping process, which drops the pipe into the formed groove,
It consists of a backfilling process that backfills the groove.
The pipe is, only write down in the groove in a state where the wound protective plate made of steel plate,
The width of the notch is substantially the same as the diameter of the protective plate wound around the pipe.
Construction method of underground piping in the boulder zone. In the method of constructing underground piping in the boulder zone according to claim 1,
The notch is a method of constructing underground piping in a boulder zone, characterized in that a rotary cutter with a carbide tip attached to the outer circumference of a disk is rotated at high speed. In the method of constructing underground piping in the boulder zone according to claim 1 or 2.
A method for constructing underground piping in a boulder zone, characterized in that the soil and the boulders are taken out by a tilt fork with a bucket, which is composed of a lower bucket and an upper movable fork.

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