JP3819600B2 - Piping laying method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe laying method for a newly laid supply pipe or the like.
[0002]
[Prior art]
Conventionally, a supply pipe has been laid as a pipeline for supplying gas from a main branch pipe buried under a road to a consumer in a private area.
[0003]
The supply pipe is connected to one end in the laying direction via a service channel attached to a branch opening formed in the main pipe, and the other end in the laying direction is connected to a meter stand pipe at a customer's destination. ing.
When establishing a new supply pipe, excavate starting and reaching resisters that open to the surface of the ground where the main pipe is buried and where the pipe can be connected to the meter stand pipe. Inserting the supply pipe between the stand and connecting one end of the supply pipe in the laying direction to the service tee attached to the branch of the main pipe, while connecting the other end in the laying direction to the meter stand pipe Yes.
In order to newly install a supply pipe, a drilling rod such as a round steel rod or a screw auger that digs while forming a hole for inserting the supply pipe, and a hydraulic engine as a drive source for propelling and pulling back this digging rod, An excavation propulsion device configured with a propulsion device main body or the like including any of an internal combustion engine, an air motor, an electric motor, and the like is prepared.
[0004]
By the way, in recent years, in order to prevent the supply pipe from being damaged by an external force generated at the time of a disaster such as an earthquake, a synthetic resin such as a polyethylene pipe (PE pipe) having flexibility compared to a steel pipe used conventionally. Tubes are starting to be used.
The above work is also performed when a supply pipe is newly installed including the case where such a PE pipe is laid.
[0005]
[Problems to be solved by the invention]
However, in the conventional laying work described above, there is a possibility that the working time required for the laying work may be lengthened.
That is, since the excavation propulsion apparatus includes various devices as described above, the work required for installation in a narrow shaft and transportation into the shaft is increased. In addition, since the propulsion rod is added according to the propulsion length, the propulsion time is increased in proportion to the propulsion distance, and the addition work and the work for removing and collecting the added one are performed. The working time also becomes longer due to the increase of. In addition, since the propulsion operation of the propulsion rod, the addition operation, and the rod recovery operation are performed within the confinement of a narrow space, the labor burden on the operator increases. In other words, the vertical shaft has a restriction that the excavation width of the ground cannot be increased unnecessarily, and if the excavation width is close to the length of the rod to be added or recovered, there is a margin for the extension or recovery work. This reduces the workability within the shaft.
[0006]
In view of the problems in the above-described conventional piping laying method, the present invention is to provide a piping laying method that can shorten the work time by reducing the number of work steps. In particular, an object of the present invention is to provide a laying method capable of continuously carrying out excavation and pull-in operation of a supply pipe.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is a pipe laying in which a digging means is propelled from the ground surface to the ground, and a PE pipe corresponding to a new pipe material is inserted into a propulsion hole formed by the digging means. It is a construction method that is integrated with an extendable cylinder equipped with a digging means at the tip, and is integrated with one end of the supply pipe to be newly installed in a drilling propulsion device composed of a self-propelled traveling body, and the cylinder is extended. Sometimes when the cylinder is contracted, when the cylinder is contracted, the traveling body is moved toward the digging means to pull the supply pipe integrated therewith , and simultaneously with the formation of the propulsion hole, It is characterized by pulling in the supply pipe .
[0008]
According to a second aspect of the present invention, in the pipe laying construction method according to the first aspect, the piston of the expansion / contraction rod built in the cylinder is configured by a hydraulic motor, and the expansion / contraction rod is rotated while being extended to dig. It is a feature.
[0009]
[Action]
According to the first and second aspects of the present invention, the supply pipe integrated with the excavation propulsion device is achieved by the traveling body self-propelled and traveling toward the excavation means when the excavation means that excavates while extending is completed. Therefore, it is possible to eliminate the need to add or recover the rod as in the conventional method only by repeating the excavation and the subsequent pulling operation of the supply pipe.
[0010]
【Example】
The details of the present invention will be described below with reference to the illustrated embodiments.
[0011]
FIG. 1 is a schematic diagram for explaining the configuration of an excavation propulsion apparatus used in a laying method according to an embodiment of the present invention. In the figure, the excavation propulsion apparatus 1 has a cutting bit 2 serving as an excavation means fixed at the tip. A hydraulic cylinder 3 provided with a telescopic rod 3A, a traveling body 4 provided with a plurality of caterpillars 4A integrated on the rear part of the hydraulic cylinder 3 and exposed on the outer surface, and integrated behind the traveling body 4 And a supply pipe 5 to be converted.
The cutting bit 2 has a tapered cone shape, its bottom is fixed to the telescopic rod 3A, and a convex bit serving as a number of cutting parts is provided on the taper surface so that it can excavate in the soil.
[0012]
The hydraulic cylinder 3 has an internal structure shown in FIG.
In FIG. 2, the telescopic rod 3A provided in the hydraulic cylinder 3 has a piston composed of a hydraulic motor (indicated by reference numeral 3A1 for convenience), and the output shaft of the hydraulic motor 3A1 corresponds to the telescopic rod 3A. ing.
The hydraulic motor 3 </ b> A is formed with a suction port 3 </ b> A <b> 1 a that communicates with an extension oil chamber in the hydraulic cylinder 3 and a discharge port 3 </ b> A <b> 1 b that communicates with a contraction oil chamber in the hydraulic cylinder 3. In the case of this embodiment, a gear motor in which the hydraulic motor 3A1 is inscribed or circumscribed is used. A one-way clutch (not shown) is interposed in the support portion of the output shaft of the hydraulic motor 3, and this one-way clutch is used only when the oil is introduced into the extension oil chamber of the hydraulic cylinder 3. When the rotation is transmitted and the oil is introduced into the contraction oil chamber, only the gear is idled so that the rotation is not transmitted to the telescopic rod 3A.
In the hydraulic motor 3A1, the oil passage on the way from the suction port 3A1a to the discharge port 3A1b is converted to a direction in which the gear can be rotated, and when the oil introduced from the expansion oil chamber flows into the contraction oil chamber By setting the orifice action (the squeezing effect by the area ratio between the extension oil chamber and the suction port), oil having a pressure that can provide the rotational torque necessary for soil cutting when the telescopic rod 3A is extended is introduced. It can be rotated.
[0013]
On the other hand, in FIG. 1, the traveling body 4 is constituted by a cylindrical member in which the rear portion of the hydraulic cylinder 3 is integrated, and the outer peripheral surface is provided with caterpillars 4A at a plurality of locations along the circumferential direction.
The caterpillar 4A has drive wheels on the excavation means side, and the drive wheels are driven to rotate by a hydraulic motor (not shown) so as to be able to travel toward the cutting bit 2 side.
Oil supply hoses (members indicated by reference numerals P1 and P2 in FIG. 1) to the hydraulic motor 3A1 and the caterpillar 4A are inserted into a supply pipe 5 described later and connected to each motor.
[0014]
A chuck member 6 for integrally supporting the end of the supply pipe 5 is attached to the end of the traveling body 4 opposite to the side on which the hydraulic cylinder 3 is integrated.
As shown in FIG. 1, the chuck member 6 has a hook portion that can be hooked on the inner surface of the supply pipe 5, and the supply pipe 5 is integrated at the rear end of the traveling body 4 by the hook portion.
[0015]
The supply pipe 5 is mounted on a reel installed on the ground, and one end from the reel is fed out and attached to the chuck member 6.
[0016]
In this embodiment, the supply pipe 5 is laid by the following procedure using the excavation propulsion device 1 having the above-described configuration.
(1) The excavation propulsion device 1 is installed in the start resistance of the start resistance and the reach resistance (not shown) previously formed at both ends of the laying section of the supply pipe 5, and the excavation means 2 A support member (not shown) that receives a reaction force at the time of initial excavation is provided in an immovable state, and the excavating means 2 is positioned at the laying propulsion hole forming position.
[0017]
(2) Extending the telescopic rod 3A of the hydraulic cylinder 3 and rotating the cutting bit 2 as the digging means by feeding oil to the hydraulic motor 3A1 to dig.
In this case, the telescopic rod 3A is extended by being sent to the oil chamber for extension of the hydraulic cylinder 3 and discharged from the oil chamber for contraction, while the telescopic rod 3A serves as an output shaft of the hydraulic motor 3A1. Since the suction port communicates with the extension oil chamber, the oil sent to the extension oil chamber is introduced into the suction port, and the oil discharged from the discharge port flows into the contraction oil chamber, so that the hydraulic motor 3A1 is driven and the cutting bit 2 rotates.
[0018]
(3) When the telescopic rod 3A of the hydraulic cylinder 3 finishes extending, the telescopic rod 3A is stretched and fed into the contracting oil chamber of the hydraulic cylinder 3 and discharged from the extending oil chamber at the same time as the traveling body. 4 moves toward the cutting bit 2 through the drive of the caterpillar 4A.
In this case, the hydraulic cylinder 3 contracts as the traveling body 4 moves forward in the so-called digging direction, so that the supply pipe 5 positioned at the rear end of the traveling body 4 is pulled and pulled. This state is as shown in FIG. 3, and the amount of pull-in of the supply pipe 5 corresponding to the distance that the hydraulic cylinder 3 contracts (the distance indicated by the symbol L in FIG. 3) is obtained. 1 and 3 indicates the rear position of the traveling body 4 when the hydraulic cylinder 3 is extended and the traveling body 4 is not traveling, and the position denoted by S2 in FIG. This is the rear position of the traveling body 4 when the hydraulic cylinder 3 contracts and the traveling body 4 has finished traveling, and the distance difference (L) between these positions S1 and S2 is the amount of the supply pipe 5 drawn.
[0019]
Thereafter, the processes (2) and (3) are repeated, and the supply pipe 5 is drawn over the entire laying section.
[0020]
The traveling direction of the excavation propulsion device 1 can be identified by, for example, installing a transmitter in the traveling body 4 and receiving a signal from the transmitter on the ground to determine the depth and direction of the excavation.
[0021]
In the embodiment as described above, the propulsion hole of the supply pipe 5 is formed by the cutting bit 2. However, since the propulsion hole is formed by the diameter expanding operation in the soil by the cutting bit 2, the generation of the soil is generated. There are very few.
[0022]
Moreover, the excavation propulsion apparatus 1 that has reached the ultimate resistance can finish the laying operation only by removing the oil supply hose from the supply pipe 5 after separating the hydraulic cylinder 3 and the traveling body 4 from the supply pipe 5. .
[0023]
It should be noted that the present invention is not limited to the pipe laying between the starting resistance and the reaching resistance as in the case of the above-described embodiment, such as a new supply pipe. Of course, it can be applied to the laying of a branch pipe from this branch pipe that may not be performed.
[0024]
【The invention's effect】
As is clear from the above embodiments, according to the first and second aspects of the present invention, when the excavating means that excavates while extending, the traveling body self-travels and travels toward the excavating means side. This makes it possible to pull in the supply pipe integrated in the excavation propulsion device, so that only the excavation and subsequent pull-in operation of the supply pipe is repeated, eliminating the need for rod addition and recovery work as in the conventional method. can do. Thereby, the time required for the laying work can be shortened by eliminating the time required for adding and collecting the rods. In particular, by eliminating the need for such addition and collection work, the laying work time can be reduced to about 1/3 compared to the conventional construction method.
[Brief description of the drawings]
FIG. 1 is a side view of an excavation propulsion apparatus used in a pipe laying method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram for explaining a part of the internal structure of the excavation propulsion device shown in FIG. 1;
FIG. 3 is a side view for explaining one mode of a laying method using the excavation propulsion device shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavation propulsion apparatus 2 Cutting bit equivalent to excavation means 3 Hydraulic cylinder 3A Telescopic rod 3A1 Hydraulic motor 4 Traveling body 4A Caterpillar 5 Supply pipe using PE pipe equivalent to new pipe material 6 Chuck members P1, P2 Oil supply hose

Claims (2)

A pipe laying method in which a digging means is propelled from the ground surface into the ground, and a new supply pipe is inserted into a propulsion hole formed by the digging means, and is integrated with an extendable cylinder equipped with a digging means at the tip. One end of a supply pipe to be newly installed is integrated with an excavation propulsion device composed of a self-propelled traveling body, and digging is performed by the digging means when the cylinder is extended, and when the cylinder is contracted, the traveling body is A pipe laying method characterized by pulling the supply pipe integrated with it by running toward the excavating means, and pulling in the supply pipe simultaneously with the formation of the propulsion hole .   2. The pipe laying method according to claim 1, wherein the piston of the expansion rod built in the cylinder is constituted by a hydraulic motor, and the expansion rod is rotated while being extended to dig.

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