JPH0193689A - Method of underground piping construction by air shock type drill - Google Patents

Abstract

PURPOSE: To reduce a term of constructing a pipeline by inserting an air-hose connecting to a penetrating machine or the like into an interior of a pipe body to be buried, operating the penetrating machine accompanying a newly provided pipe body by compressed air, and pushing an existing pipe body by a pushing member. CONSTITUTION: An air-hose 2 is inserted into an interior of a newly provided pipe body P2 , the inserted air-hose is connected to a main body casing 1 of the penetrating machine B and an air-compressor. A tip section of the head of the pipe body P2 is connected through a connecting unit U to the main body casing 1. The penetrating machine B is operated to drive forward into the under ground by compressed air, and an existing pipe body P1 is pushed frontward by a pushing member 6 of the main body casing 1. A newly provided pipe body P2 is further accompanied to the penetrating machine B. Corresponding to the driving of the penetrating machine, changing an old pipe to a new pipe can be simultaneously done, so a term of constructing a pipeline can be greatly reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to sewerage pipes, as well as electric power, communication, gas, etc. pole pipes, which are buried underground using an air impact perforator. Regarding construction methods.

[Conventional technology]

In recent years, as a piping construction method that buries pipe bodies according to the purpose, such as polyethylene pipes (PE pipes) for gas, underground, compressed air An underground propulsion method is known in which a perforator is propelled into the ground by impact action, and a pipe body is inserted into the obtained perforation hole of a required diameter while being inserted and buried. In the case of large-diameter steel pipes, there is also a known method of extruding the steel pipes from the rear while adding them in the direction using a piercing machine.

[Problem that the invention attempts to solve]

However, the method of backfilling by passing a newly installed pipe into the through hole is somewhat troublesome. Furthermore, if there is an existing old pipe in the planned piping location, that is, when replacing old and new pipes, it is troublesome to pull out and remove the old pipe, and generally requires a fairly long construction period. In addition, in construction sites where excavation is not possible, or in the method of pulling out old pipes from the front using hydraulic pressure, or in the extrusion method of simply pushing forward using hydraulic pressure, the pipe body itself is already fragile and will break. There are problems such as making it impossible to pull out or extrude.

Furthermore, especially in the case of extraction, there are circumstances in which it is necessary to bring large equipment to the site.

The present invention has been made in view of the problems of the conventional piping construction methods, and aims to provide a piping construction method using an air impact type underground penetrating machine that makes it possible to significantly shorten the construction period.

[Means for solving problems]

In order to achieve this objective, the piping construction method using the air impact type underground boring machine of the present invention supplies compressed air from the air compressor C to the main body casing of the piercing machine B through the air hose 2, and The impact from the air activates the penetrating machine B and propels it underground.

In this piercing machine B, the pipe body P to be newly buried pipe,
When the air hose 2 is inserted into the inside of the body and connected to the air compressor C and the main body casing L, the tip of the pipe P is connected to the rear end of the main body casing 1. By connecting through the unit U, the main body casing l is
The extrusion member 6 at the tip of the extrusion member 6 pushes out the existing aged pipe P+ forward, and attaches the new pipe P to the piercing machine B.

[Effect]

As for the standard length of the newly installed pipe P, the general rated size is around 5.5 m, and the lengths of these rated sizes are added according to the length of the pipe. - For example, when piping is carried out in the manner shown in Figure 1, the initial work setup is as follows:
An air hose 2 is inserted into the pipe body P, and the air hose 2 is connected to the main body casing 1 of the piercing machine B and the air compressor C, respectively.

Next, the tip of the tube P is joined to the main casing L via the connecting unit U. From this, the penetrating machine B is propelled at a predetermined angle from the ground surface G and L based on the aim of the piping location. The extrusion member 6 at the tip of the piercing machine B pushes forward the existing aged pipe P to be replaced, and the newly installed pipe P is propelled into the ground together with the piercing machine B. .

At this time, while the first newly installed pipe P is sunk into the ground and its rear end remains on the ground surface G, L, the next pipe Pt is connected to this rear end using a joint member or the like. Through these steps, the required number of newly installed pipes P are connected and the underground piping is carried out.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a piping construction method using an air impact type piercing machine of the present invention will be explained with reference to the drawings.

In Figures 1 to 3, the main body casing 1 of the piercing machine B
An air hose 2 from an air compressor C is drawn in and connected to the casing 2, and compressed air is supplied into the main body casing l through the air hose 2. This compressed air is used to impact the piston 3 and propel the perforator B in a predetermined direction underground.

That is, a piston 3 is slidable in the axial direction inside the main casing 1, and an air hose 2 is connected to the piston 3.
When compressed air is introduced from the head 4, it is activated to strike the striking portion 4a of the head 4. The head 4 is biased rearward by a spring 5 attached around the rod portion 4b, and the piston 3 resists this biasing force to apply a blow. In addition, a tapered, conical extrusion member 6 is removably attached to the distal end through-hole 4c of the portion that protrudes to the outside of the head 4, and this extrusion member 6 is installed after the existing old pipe P to be replaced. It is adapted to engage the open end. The extrusion member 6 is attached to the through-hole portion 4c by a locking rod 4d protruding forward from the through-hole portion 4C and being locked between a pair of upper and lower locking roll pins 6a16b provided inside the extrusion member 6. Insert the rod 4d and lock this locking rod 4d.
It is designed to hold the

Further, as shown in FIG. 3, a tube connection unit U is detachably attached to the rear end of the main body casing l via a socket 10. This connection unit U has a pipe body P to be buried,
The air hose 2 is connected to the main body casing via this connection unit U! It is connected to the.

The structure of the connection unit U is such that the main body adapter 11 is attachable to and detachable from the rear end of the main body casing l by screwing through a socket lO. A female threaded portion 11a is provided at the rear end of the main body adapter 11, and an inner peripheral surface connected to the female threaded portion 11a is a tapered portion flb having a downward slope toward the front. Further, a ring-shaped fixing socket 12 is screwed into the female threaded portion 11a, and a conical cylindrical tightening socket 13 with the same slope is in sliding contact with the tapered portion 11b, and is movable in the axial direction. is fitted in. A portion of the circumference of the tapered tightening socket 13 is cut into a slit shape, and the entire circumference is formed so that it can be elastically deformed in a direction in which the diameter is reduced.

These fixing sockets 12 and taper tightening sockets 1
Both members 3 are replaced with ones having different inner circumferential diameters each time in accordance with the diameter size dφ of the tube P.

After inserting the pipe body PI, the female screw part 12 of the fixing socket 12
By tightening to B, the tapered tightening socket 13 moves forward while slidingly contacting the outer circumferential surface of the pipe body P, and the tapered tightening socket 13 moves forward by the angle of inclination with the tapered part 11b of the main body adapter 111'llJ. The diameter is elastically reduced in the radial direction by the force, and this diameter reduction tightens the tube P from the outer periphery.

In addition, the main body adapter 11 corresponds to the outer circumferential diameter Dφ, and is designed so that a through hole with a hole diameter Dφ can be obtained in the ground by underground propulsion by the piercing machine B, so that it corresponds to the desired hole diameter. In some cases, the outer circumferential diameter Dφ may be replaced with one having a different size.

In addition, a pipe body P such as the above-mentioned PE pipe buried at the beginning,
A reinforcing annular collar 14 is fitted and fixed on the inner circumferential surface of the distal end portion in preparation for clamping and fixing with the tightening unit U side. A seal member 15 made of nonwoven fabric or the like is fixed to the outer peripheral surface of the main body casing 1 to block and absorb oil leakage from the main body casing 1 side. A flange-like abutting portion 14a is provided at the rear of the collar 14, with which the sealing member 15 comes into contact to prevent the sealing member 15 from retreating.

Next, an example of an aspect of the piping method with the above configuration will be described.

When pulling out the pipe body Pt, which is an existing old pipe such as a PE pipe, and replacing it with a new pipe body P2, such as a PE pipe, for underground piping, insert the air hose 2 into the inside of the newly installed pipe body P. The air hose 2 thus inserted is connected to the main body casing l of the piercing machine B and the air compressor C, respectively. Next, connect the tip of the leading pipe P to the main casing via the connecting unit U! to be joined to. That is, when the fixing socket 12 is tightened to the main body adapter 11, the internal taper tightening socket 13 elastically contracts in diameter as it is pushed forward, and cooperates with the reinforcing collar 14 to tighten the tube body P. Firmly hold the tip of the

From this, compressed air from the air compressor C is supplied to the main body casing 1 through the air hose 2, and the perforator B is propelled at a predetermined angle from the ground surface G, L based on the sight of the piping location. The pipe body P is propelled together with the perforator B. A connection unit U is inserted into the ground by the propulsion of the penetrating machine B.
A through hole 20 corresponding to the outer circumferential diameter Dφ will be excavated as an inclined shaft. At this time, while the first pipe P is sunk into the ground and its rear end remains on the ground surface G, L, the next pipe P is connected to this rear end using a joint member or the like. Through these steps, the required number of pipe bodies Pt are connected and drawn into the ground.

During this time, pipe body P, which is an old pipe already installed in the inclined shaft 20.

By the propulsion of the piercing machine B, the extrusion member 6 attached to the tip of the main body casing l engages with the rear open end of the tube body P and pushes it forward. Due to considerable vibration caused by compressed air, the aging pipe P.

The compacted earth and sand loosens around the pipe, allowing it to escape smoothly without putting any strain on the pipe itself.

Note that the compressed air from the air compressor C is mixed with lubricating oil as oil mist for the mechanism inside the piercing machine B, and the compressed air that has finished working is returned to the newly installed pipe body P1. discharged inside. At this time, the oil mist is absorbed by the sealing member 15 to prevent the inside of the pipe P from becoming contaminated.

FIG. 1(a) shows an example of a configuration in which old pipes are replaced with new pipes in the horizontal direction from an inclined shaft 20 through a vertical shaft 21, and FIG. 1(b) shows a newly installed pipe P! such as a PE pipe! This figure shows the case where construction is performed using only the vertical shaft 21 by utilizing the elastic properties of the vertical shaft 21.

[Effect of idea]

As explained above, the underground piping construction method using the air shock perforator of the present invention can be suitably employed in construction sites where it is impossible to bring in large equipment or excavate. Since the pipes are replaced with new pipes at the same time, there is no need to remove the old pipes, and once a hole of the required diameter is drilled using a piercing machine, the pipe body is inserted into the underground hole. That hassle is eliminated. That is, as seen in the conventional construction method in which old pipes are pulled out from the front using hydraulic pressure, and in the extrusion construction method in which pipes are simply pushed forward using hydraulic pressure,
This solves the problem of the tube body itself being fragile and becoming damaged, making it impossible to pull it out or extrude it, leading to delays in subsequent work, and significantly shortening the construction period.

[Brief explanation of the drawing]

Figures 1 to 3 show the underground piping method using the air shock type perforator of the present invention, and Figures 1 (a) and (b) are schematic cross-sectional views showing two embodiments thereof, respectively. FIG. 2 is an overall cross-sectional view of the tube connection portion in the underground penetrator, and FIG. 3 is a cross-sectional view of the connection of the tubes in the connection unit. B...Underground penetrating machine, U...Connection unit, l...
Main body casing, 2... Air hose, 3... Piston, 4... Head, 5... Fixing socket, 6...
...Extrusion member, U...Connection unit, 11...Main adapter, P,...Old pipe body, P,...New pipe body.

Claims (1)

[Claims] (1) Supplying compressed air from the air compressor C to the main body casing 1 of the piercing machine B through the air hose 2,
In order to operate the perforator B by the impact of compressed air and propel it underground, the air hose 2 is inserted into the inside of the pipe body P_2 that will be newly buried.
is connected to each of the air compressor C and the main body casing 1, and the tip of the pipe P_2 is connected to the rear end of the main body casing 1 via the connection unit U, and by the underground propulsion of the piercing machine B, Underground piping using an air impact type piercing machine, characterized in that the extrusion member 6 at the tip of the main body casing 1 pushes out the existing old pipe body P_1 forward, and the new pipe body P_2 is attached to the piercing machine B. Construction method.