JPS6124887A - Simultaneous parallel laying method of plurality of pipeline - 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 [Field of Industrial Application] The present invention relates to a method for laying a plurality of pipelines simultaneously and in parallel.

[Prior art]

Conventionally, as shown in Fig. 12, the method of laying two pipelines underground at the same time is to install a small-diameter pipe inserted into a curved or straight small-diameter borehole 5 excavated while controlling the trajectory. An excavation expansion pin 7 is connected to the rear end of the leading drill vibro, and a small-diameter trailing drill pipe 8 is connected to the rear end of the leading drill vibro.
A holding member 11 is fixed inside the front end of a sheath pipe 10 having an outer diameter slightly smaller than the large-diameter excavated hole 9 excavated by the expansion pit 7, and the center of the holding member 11 is A trailing drill pipe 8 is fitted into the section through a bearing 12 so as to be rotatable and immovable in the axial direction, and the proximal end portion of the connecting member 13 is attached to the front end side of the sheath tube 10 to connect it. Part 1
6, the front end of a small-diameter big line 14 is connected to the front end of the connecting member 13, and a rotary excavator 15 is provided at the front of the connecting member 13, and the ground in front of the sheath pipe 10 is excavated by the digging bit 7. At the same time, while excavating the ground in front of the connecting member 16 with the rotary excavator 15, the propulsion device grips and propels the rear end of the sheath pipe 10, and the sheath pipe 10 moves the sheath pipe 10 through the connecting member 13. There is a known method for propelling the small diameter pipeline 14 by
(See Publication No. 296).

However, in the case of the conventional simultaneous laying method, the sheath pipe 10
Since a propulsive force is applied to the rear part of the sheath pipe 10 to propel it and the small diameter pipeline 14, a large compressive force acts on the sheath pipe 1oK.Therefore, it is necessary to use a large diameter sheath pipe 1o. This is inappropriate as a method for laying two pipelines, and since the ground between the small-diameter pipeline 14 and the small-diameter pipeline 14 with 10 sheath pipes is excavated by the rotary excavator 15, the small-diameter pipeline 14 is connected to the sheath pipe 10. 1o, and if an outside force acts on it in this state, there is a risk that the coating on the pipe may be damaged.

[Purpose and structure of the invention]

The object of the present invention is to provide a method for simultaneously laying multiple pipelines in parallel, which can advantageously solve the above-mentioned problems. After propelling it toward the destination and penetrating the ground 2, connect the base ends of the plurality of wing-shaped support arms 6 to the tip of the traction pipeline 1, and connect the base ends of the plurality of wing-shaped support arms 6 to the tip of each support arm B. It is characterized by connecting the tip ends of the pipelines 4 to be laid, and then towing the towing pipeline 1, so that the pipelines 4 to be laid are simultaneously towed and laid underground in a parallel state. , a method for simultaneously laying multiple pipelines in parallel.

〔Example〕

Next, this invention will be explained in detail with reference to illustrated examples. FIGS. 8 to 10 show an excavation coupling 16 used in an embodiment of the invention, which is a pipe whose rear end is closed. A connecting female thread 18 is provided at the front end of the body 17, and base ends of wing-shaped support arms 6 having a hollow flat cross section are integrally connected to both sides of the tube body 17 in the diametrical direction.
A drilling nozzle 19 for spraying muddy water forward is provided at the front of the tip of each wing-shaped support arm 6, and a socket 20 with a female thread for connection is provided at the rear of the tip of each wing-shaped support arm 3. The interior of the tube body 17 communicates with the nozzle 19 through the interior of the wing-shaped support arm 6, and the center line of the nozzle 19 and the socket 20 are aligned with the tube body 1.
It is arranged on a straight line parallel to the center line of 7.

When carrying out this invention and laying a plurality of pipelines, for example two pipelines, in parallel at the same time, first, as shown in Fig. A bit 2"1 rotated by a known hydraulic drive motor fixed to the tip side of the line 1 is attached, and the pipeline 1 is propelled by a propulsion traction machine 22 installed on the ground, and [While performing II, the excavation is performed in a circular arc shape, and after the front end of the pipeline 1 protrudes to the expected destination on the ground, the tip of the pipeline 1 is cut on the ground and the part with the built-in motor is removed.

Next, as shown in FIGS. 2 to 5, the excavation coupling 16
The front end of the pipe body 17 is screwed to the male thread provided at the tip of the towing pipeline 1, and the front end of the laid pipeline 4 is screwed into the socket 20 at the tip of each support arm 3. Connect.

Next, the towing pipeline 1 is pulled by the propulsion traction machine 22 installed on the ground, and the muddy water supplied from the ground to the towing pipeline 1 is spouted from the nozzle 19, and the muddy water is used to move the front of the laid pipeline 4. While excavating or softening the ground, the pipelines 4 to be laid are simultaneously pulled and laid underground in parallel. In this case, since the support arm 6 is wing-shaped, that is, flat, the resistance during movement underground is small, and the ground is compressed when the support arm 3 passes, creating small and medium-sized slits in the ground. As time passes, the slit closes due to the restoring force of the ground.

After the front end of each laid pipeline 4 protrudes above the ground, the front end of the laid pipeline 4 is cut,
The excavation connector 16 is removed, and the laid pipeline 4 is used as a gas pipe, water pipe, electric cable storage pipe, pilot pipeline for laying a larger diameter pipeline, or for other purposes.

As shown in FIG. 6, a method for propelling and penetrating a towing pipeline underground is to propel a small-diameter pilot pipe 24 underground while excavating with a bit 21 rotated by a hydraulically driven motor. At the same time, a large-diameter pipeline 1A having a hole-expanding pin 25 at its tip may be guided by the pilot pipe 24 and propelled into the ground to penetrate, and the large-diameter pipeline 1A may be used as a towing big line.

Further, after the plurality of pipelines 4 are laid underground, as shown in FIG. A device that does not transmit bending is installed, a large-diameter laid pipeline 4A' is connected, and while muddy water is supplied from the pipeline 4 and the hole-expanding bit 25 is rotated and pulled by the propulsion traction machine 22, the pipeline is 4, the large diameter pipeline 4A may be towed and laid underground.

FIG. 11 shows another example of the excavation connector 16, in which the front end of a cylindrical hydraulic drive motor 26 is connected to the rear of the tip of each support arm B, and the drive shaft of the motor 26 is A bit 27 disposed at the front end of the support arm B is connected to the motor 26, and the front end of the pipeline 4 to be laid is detachably connected to the rear end of the motor 26. The motor 26 is configured to be driven by the muddy water sent from the pump 4.

When carrying out this invention, if the pipeline to be laid has a relatively small diameter, the excavation nozzle 19 and the bit 27 are omitted, and a shell-shaped ground compression propulsion device is installed at the front of the tip of the support arm B. A head may also be provided.

The number of pipelines laid in parallel at the same time may be six or more, and the present invention can also be implemented when a plurality of pipelines are laid simultaneously in parallel in a straight line.

When towing the towing pipeline 1 to tow and lay a plurality of laid pipelines 4, the towing bipla, the in-1
Mortar or the like may be injected and filled into the hole created by the passage of the mud by an appropriate means.Also, if the excavation connector 16 having the structure shown in Fig. 8 is used, only the mud water supply equipment installed on the ground on the starting side can be used. According to the operation of the hydraulically driven motor for rotating the bit 21 and the nozzle 1 in FIG.
Mud water can be sprayed from 9.

In addition, if the front end of the pipeline 4 to be laid is screwed and connected to the socket 20 of the excavation coupler 16, if trouble occurs during towing and laying, the pipeline to be laid 4 can be rotated and the excavation coupler 16 can be connected. By removing it from the socket 20, the pipeline 4 can be pulled out and recovered.

When carrying out this invention, in order to reduce the resistance when towing the big line 1, a female threaded metal fitting is rotatably attached to the front end of the tube body 17 of the excavation coupling 16 via a rotation and thrust transmission bearing. , and the distal end of the pipeline 1 may be threadedly connected to the female threaded fitting, and the pipeline 1 may be pulled while being rotated by the propulsion/traction machine 22.

According to this invention, after the traction pipeline 1 is propelled in advance from a starting point on the ground toward a destination location and penetrates the ground 2, a plurality of wing-shaped support arms are attached to the tip of the traction pipeline 1. 6 and the distal ends of the laid pipelines 4 are respectively connected to the distal ends of each support arm 6, and then the towing pipeline 1 is towed. The pipelines 4 to be laid can be pulled and laid underground simultaneously and in parallel, and the force acting on the pipelines 4 to be laid is tensile force and no compressive force, so multiple small diameter Pipelines can be easily laid, and since the support arm 6 is in the shape of a flat wing, there is little resistance when moving underground, and the passage of the support arm 6 compresses the ground, creating a slit. However, the width of the slit is small, and due to the restoring force of the compressed ground, the slit disappears within a certain period of time, or the width of the slit becomes even smaller, so that the approach movement of each laid pipeline 4 is prevented. ,
Effects such as being able to maintain the laid pipelines 4 in a parallel state can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing a state in which a pipeline for traction is being laid while being towed, and FIGS. 2 is a side view, FIG. 6 is a plan view showing the connection between the traction pipeline and the laid pipeline, FIG. 4 is a partially cross-sectional plan view, and FIG. 5 is taken from A-A in FIG. FIG. 6th
The figure is a front view of a state in which a large-diameter towing via line is being propagated and laid, Figure 10 is a sectional view taken along the line B-B in Figure 8, and Figure 1
FIG. 1 is a plan view showing the relationship between another example of the excavation connector and the pipeline. FIG. 12 is a partially longitudinal side view showing an apparatus for carrying out a conventional method for simultaneously laying multiple big lines. In the figure, 1 is a towing pipeline, 2 is the ground, the wing is a wing-shaped support arm, 4 is a pipeline to be laid, 16 is a drilling connection, 19 is a drilling nozzle, 20 is a socket, 21 is a bit, and 22 is a propulsion Towing machine, 24-piece pilot pipe,
25 is a focus for hole expansion, 26 is a hydraulic drive type motor, and 27 is a bit.

Claims (1)

[Claims] After the traction pipeline 1 is propelled from a starting location on the ground to a destination location and penetrates the ground 2, the base ends of the plurality of wing-shaped support arms 3 are connected to the tip of the traction pipeline 1. At the same time, by connecting the tips of the pipelines 4 to be laid to the tips of each support arm 3, and then towing the towing pipeline 1, the pipelines 4 to be laid are simultaneously and parallel to each other underground. A method for simultaneously laying multiple pipelines in parallel, which is characterized by laying the pipelines in parallel.