JPH102191A - Propulsion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lay a pipeline by conforming an axial center to a predetermined laying line without damaging a groove by installing a soft abutting ring with a tapered surface corresponding to the groove for welding in a pipe end section to a push ring of a pipe-jacking device and jacking the push ring. SOLUTION: A V-shaped groove 2 for welding, to which a groove surface 2a having an area sufficiently larger than a root face 2b is formed, is shaped at the end section of a pipe 1. A pipe-jacking device A is mounted on a departure pit B, a leader is placed on the rail 3a of a frame 3 first, and the pipe 1 is jacked to a bedrock by a push ring 4, from which an abutting ring 6 is removed, by driving a jack 5. The push ring 4 is pulled back, and the batting ring 6 comprising a material softer than steel, coinciding with a predetermined laying line and having a tapered surface corresponding to the tapered surface 2a of the pipe 1 is set up and the pipe 1 is jacked. After the pipe 1 is jacked, the push ring 4 is pulled back, the new pipe 1 is placed on the rail 3a, and the pipes 1 are welded and connected while oppositely facing the mutual grooves 2 for welding and advance. The operation is repeated, and the axial center of the pipe 1 is conformed to the predetermined laying line and a pipeline is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion device which is advantageously used when laying a pipe by propelling the pipe underground while welding the pipe.

[0002]

2. Description of the Related Art Underground pipes for water supply, sewerage, electric wires, telephone lines, and the like are laid continuously by fume pipes, cast iron pipes, or steel pipes. When laying such a pipeline, a propulsion method is generally adopted in consideration of road conditions and environmental conditions.

[0003] A case in which a pipeline is laid by a propulsion method will be briefly described. A starting shaft and an arrival shaft are constructed on the planned laying line of the pipeline, and a main pushing device is installed in the starting shaft, and a push wheel of the main pushing device is brought into contact with the rear end of the pipe to be propelled. Thereafter, the jack of the main pushing device is driven to apply thrust to the tube from the push wheel, and the tube is propelled by the thrust. A pipe to be newly propelled is connected to the propelled pipe by a pipe joint, and a push ring is brought into contact with the connected pipe again to propell. By repeating this operation, the pipe is propelled toward the arrival shaft, and the pipeline is laid.

[0004] Recently, there is a case where a pipeline for circulating a fuel gas represented by natural gas is laid by a propulsion method. Gas leakage must not occur in such conduits. For this reason, a double pipe consisting of a steel pipe as a pipe through which gas flows and a sheath pipe for protecting the steel pipe is used.
Each time a double pipe is propelled, a new double pipe is made to face, and the ends of the steel pipes are welded all over the circumference and connected.

[0005]

In the above-mentioned double pipe, steel pipes are welded to each other and connected to each other, so that a welding groove is formed at an end of the steel pipe. For this reason, when thrust is given by abutting the push ring against the rear end of the steel pipe, this thrust acts intensively on the root face of the groove for welding,
There is a problem that the surface pressure is abnormally high, the root face is damaged, and the quality of welding may be impaired.

[0006] The main pushing device installed in the starting shaft,
The double pipe is centered so that it can be propelled with its axis aligned with the planned laying line. However, as the propulsion distance increases, the axis of the double pipe propelled underground may deviate from the planned laying line. In this case, the traveling direction of the excavator arranged at the head of the continuous double pipe is controlled so as to coincide with the planned laying line, but at the same time, the axis of the double pipe closest to the starting shaft is set to the planned laying line. It is preferable to match with.

[0007] An object of the present invention is to be able to propel the steel pipe closest to the starting shaft in alignment with the scheduled laying line of the pipeline without damaging the welding groove formed at the end of the steel pipe. A propulsion device is provided.

[0008]

In order to solve the above-mentioned problems, a propulsion device according to the present invention is a propulsion device for propelling a tube having a groove for welding at a longitudinal end portion by a main pushing device. A contact ring having a tapered surface corresponding to a welding groove formed at the end of the tube formed on the inner surface thereof is fixed to a pressing ring of the main pushing device, and a tapered surface of the corresponding contact ring is formed at the end of the tube. The thrust of the main pushing device can be transmitted to the pipe by contacting the welding groove.

In the above-mentioned propulsion device, since the tapered surface corresponding to the welding groove is formed on the inner surface of the contact ring fixed to the push ring of the main pushing device, the contact ring is brought into contact with the end of the pipe. Then, the tapered surface of the ring comes into contact with the groove surface of the tube. For this reason, the contact surface between them is widened, and even if a thrust is applied to the pressing wheel, the surface pressure is reduced and the welding groove is not damaged.

[0010] In addition, if a deviation from the planned laying line of the pipe line occurs in the axis of the pipe, the rear end of the pipe moves along the tapered surface formed on the contact ring with the application of thrust. The axis of the tube coincides with a predetermined scheduled laying line.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the above-mentioned propulsion device will be described below with reference to the drawings. FIG. 1 is a side view illustrating the configuration of the propulsion device, FIG. 2 is a diagram illustrating the relationship between the end of the tube and the contact ring, and FIG. 3 is a diagram illustrating the procedure for matching the axis of the tube with the planned laying line. FIG.

A propulsion apparatus A shown in FIG. 1 is installed in a starting shaft B to apply thrust to a pipe 1 to propell the pipe 1 along a preset laying line. It is configured as a main pushing device in the. In particular, this propulsion device A is configured to be advantageous when used when propelling a pipe 1 having a welding groove 2 formed at an end as shown in FIG.

First, the tube 1 will be briefly described. Tube 1
The pipes 1 are continuously propelled in the longitudinal direction to form gas pipelines in the ground, and the respective pipes 1 are continuously welded to each other at their opposite ends, so that the strength and airtightness of the pipelines are improved. It is configured to be able to exhibit.

The specification of the tube 1, such as the inner diameter and the wall thickness, is set according to a normal design procedure. A welding groove 2 is formed at the end of the pipe 1 according to the set thickness. When the pipes 1 are connected by welding, the welding operation is performed from the outer peripheral side. For this reason, the shape of the groove 2 formed at the end of the pipe 1 is generally a so-called V groove composed of a groove surface 2a and a root face 2b. Therefore, the groove surface 2a is a tapered surface, and the area is sufficiently larger than the root face.

The propulsion device A includes a frame 3 on which the pipe 1 is placed and the push ring 4 slides to support a reaction force during propulsion, and one end attached to the frame 3 and the other end attached to the push ring 4. A jack 5 having a plurality of hydraulic cylinders mounted thereon,
A push ring 4 that is driven by a jack 5 to apply thrust to the tube 1, and a contact ring 6 that is fixed to the push ring 4 and abuts on a welding groove 2 formed at an end of the tube 1 to apply a thrust.
, And is configured.

The frame 3 is provided with a rail 3a on which the pipe 1 is placed and which guides the direction of propulsion at the start of propulsion, and a push wheel 4
Are mounted on the rail 3a, and a supporting wall 3c that contacts the side wall of the starting shaft B and transmits a reaction force during propulsion to the side wall. At this time, the starting shaft B is set in a state where the direction and level are adjusted so that the axis of the pipe 1 can coincide with the planned laying line of the pipeline.

The push wheel 4 is driven by a jack 5 and transmits a thrust generated when the jack 5 is extended to the pipe 1 through a contact ring 6.
And a device for forming a tunnel in the ground such as an excavator or a leading conductor (not shown) arranged at the head of the pipe 1.

The jack 5 is constituted by a hydraulic cylinder. One end of a cylinder 5a is mounted on a supporting wall 3c of the frame 3 and one end of a rod 5b is mounted on the pressing wheel 4. Therefore, when the jack oil 5 is expanded and contracted by supplying the pressurized oil, the push wheel 4 reciprocates on the gantry 3b with the expansion and contraction. When the jack 5 is extended, a thrust is applied to the tube 1, and when the jack 5 is contracted, the position of the tube 1 is maintained and the pressing wheel 4 can be retracted.

The contact ring 6 is fixed to the pushing wheel 4 in a state where its axis coincides with a predetermined laying line of the pipeline, and transmits the thrust from the pushing wheel 4 to the pipe 1. On the inner surface of the contact ring 6, a tapered surface 6a corresponding to the welding groove 2 formed at the end of the tube 1 is formed. In the taper surface 6a, the taper angle is formed to be equal to the taper surface 2a of the welding groove 2, and the dimension on the small diameter side and the dimension on the large diameter side are:
It has a value sufficiently smaller than the inner diameter of the tube 1 and sufficiently larger than the outer diameter.

Since the contact ring 6 is in direct contact with the welding groove 2 of the pipe 1 made of a steel pipe to transmit a thrust, a high surface pressure acts on the contact surface between the two. Therefore, when the strength of the contact ring 6 is larger than the strength of the pipe 1, the welding groove 2 is used.
The contact ring 6 is preferably made of a material softer than steel, for example, a metal material such as brass, gunmetal, cast iron, or a synthetic resin material such as nylon.

Next, a procedure for propelling the pipe 1 by the propulsion device A will be described. Prior to promoting tube 1,
A not-shown leading conductor that forms a tunnel in the ground is propelled from the starting shaft B to the arrival shaft. As the leading conductor, a cutter head provided at the tip is driven to excavate the ground, and excavated earth and sand is discharged to the ground to form a tunnel, or a lead machine for consolidating the soil of the ground to form a tunnel. The body or the like can be selectively used according to the nature of the ground or the diameter of the pipe 1.

The leading conductor is placed on the rail 3 a of the propulsion device A installed in the starting shaft B, and the contact ring 6 is removed from the push wheel 4. In this state, the jack 5 is driven to bring the push wheel 4 into contact with the leading conductor, and the jack 5 is further driven to propel the leading conductor.

After propelling the leading conductor, the push ring 4 is pulled back and the contact ring 6 is mounted. At the same time, the pipe 1 is placed on the rail 3a.
And the jack 5 is driven to bring the contact ring 6 into contact with the tube 1. Further, by driving the jack 5, the pipe 1 is propelled to the ground.

After the tube 1 has been propelled, the push wheel 4 is pulled back to place a new tube 1 on the rail 3a. This new tube 1
Is moved in the direction of the pipe 1 already propelled, and the groove 2 for welding is moved.
And the tubes 1 are welded and joined together. After the welding of the tube 1 is completed, the jack 5 is driven to propel the new tube 1 and the already propelled tube 1 by the push wheel 4.

By repeating the above operation, new pipes 1 are sequentially welded and connected to the already propelled pipes 1 and propelled. When the leading conductor placed at the head reaches the arrival shaft, a large number of pipes are placed between the both shafts. It is possible to lay a pipe line in which the pipe 1 is integrated by welding.

In the course of propulsion of the pipe 1, as shown in FIG. 3 (a), the propulsion direction of the pipe 1 may deviate from the planned laying line. In this case, when the rear end of the tube 1 is brought into contact with the tapered surface 6a of the contact ring 6 to apply thrust, the rear end of the tube 1 moves along the tapered surface 6a as shown in FIG. And
The axis of the tube 1 and the axis of the contact ring 6 coincide. That is,
The pipe 1 is propelled while maintaining its state in which the axis coincides with the predetermined laying line of the pipe line set in advance.

[0027]

As described above in detail, in the propulsion device according to the present invention, the contact ring having a tapered surface corresponding to the welding groove formed at the end of the pipe is fixed to the press ring, and Since the thrust can be transmitted to the pipe through the ring, the pipe can be propelled without damaging the groove. Therefore, when a new pipe is welded and connected to the already propelled pipe, good strength and airtightness can be maintained without impairing the quality of welding.

Further, even when the pipe is misaligned as the pipe is propelled, the tapered surface of the welding groove formed at the end of the pipe comes into contact with the tapered surface of the contact ring. Further, the thrust transmitted through the ring can move the axis of the tube so as to coincide with the axis of the contact ring.
For this reason, it has a feature that the misalignment of the tube can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a configuration of a propulsion device.

FIG. 2 is a diagram showing a relationship between an end of a tube and a contact ring.

FIG. 3 is a diagram for explaining a procedure when the axis of the pipe is coincident with a planned laying line.

[Explanation of symbols]

 Reference Signs List A Propulsion device B Starting shaft 1 Pipe 2 Welding groove 2a Tapered surface 2b Root face 3 Frame 4 Press ring 5 Jack 6 Contact ring 6a Tapered surface

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takashi Ogawara 1-14-14 Honkita, Ichikawa City, Chiba Prefecture (72) Inventor Hideki Uno 1118-22, Wakamatsucho, Tokorozawa City, Saitama Prefecture (72) Inventor Tohru Sato Kanagawa 127-1-110 Shimosakunobu, Takatsu-ku, Kawasaki-shi (72) Inventor Yutaka Shindo 4-34-12-104 Sengoku, Bunkyo-ku, Tokyo

Claims (1)

[Claims] 1. A propulsion device for propelling a pipe having a welding groove formed at a longitudinal end thereof by a main pushing device, wherein the inner surface has a taper corresponding to a welding groove formed at an end of the tube. The contact ring with the surface formed is fixed to the push ring of the main pushing device, and the tapered surface of the corresponding contact ring is brought into contact with the welding groove formed at the end of the tube to transmit the thrust of the main pushing device to the tube. A propulsion device characterized in that the propulsion device is configured to be able to perform the operation.