JP2000120378A - Pipe jacking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a larger working space for promoting a pipe in a shaft. SOLUTION: A pipe jacking device 16 comprises a table 30 for placing a pipe 14 which is arranged in a shaft 10, and a hydraulic jack 32 for giving thrust to the pipe 14, and a pushing collar 34 for transmitting the thrust of the hydraulic jack 32 to the pipe 14, and which is movably attached on the mounting table 30. The jack 32 is at least one hydraulic jack 32, the whole or a part thereof is arranged in the earth serving a pit wall 22 or a mounting table 30 as a reaction force supporting body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to an apparatus for propelling a pipe from a shaft into the ground.

[0002]

2. Description of the Related Art As a device for sequentially propelling a plurality of pipes made of concrete pipes and steel pipes from a shaft into the ground for laying a pipeline in the ground, the pipes arranged in the shaft are used. And a hydraulic jack supported on the mounting table for applying a thrust to the pipe, and the hydraulic jack movably attached to the mounting table. And a push wheel for transmitting the thrust to the pipe.

[0003]

Incidentally, the vertical shaft has a minimum size in order to save labor, time, cost and the like required for the construction thereof. The work space for the propulsion of the pipes performed by using a small space is inevitably reduced, resulting in a decrease in work efficiency, a deterioration in work environment, and the like.

[0004] It is an object of the present invention to provide a pipe propulsion device which can secure a larger pipe propulsion work space in a shaft.

[0005]

SUMMARY OF THE INVENTION A pipe propulsion device according to the present invention comprises:
A pedestal for placing a pipe, disposed in a shaft, and at least one hydraulic jack, all or part of which is disposed underground, and which counters the pit wall or the pedestal of the shaft; A hydraulic jack serving as a force support for applying a thrust to the tube; and a push wheel movably mounted on the mounting table for transmitting the thrust of the hydraulic jack to the tube.

[0006]

According to the present invention, since all or a part of the hydraulic jack for exerting a thrust on a pipe is disposed underground, the conventional pipe propulsion device occupies the inside of the vertical shaft. The space required to dispose the hydraulic jacks can be made unnecessary or reduced, so that a larger space for the pipe propulsion work can be secured in the vertical shaft. This greatly contributes to improving the efficiency of pipe propulsion work in the vertical shaft and improving the work environment.

[0007]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, a pipe propulsion device used to propel a pipe 14, such as a steel pipe or concrete pipe in the illustrated example, from a shaft 10 into the ground, i.e., the ground 12 around it. 16 is arranged in the shaft 10.

The shaft 10 shown has a circular cross-sectional shape, and has a wellhead 18 and a wellhead wall 22 defined by a cylindrical casing 20. The shaft in which the pipe propulsion device 16 is disposed may have a cross-sectional shape other than the circular shape, for example, a rectangular shape.

The pit wall or casing 20 is provided with a circular hole 24 which allows the passage of the pipe 14 from the interior of the shaft 10 to the ground 12 outside.

The pipe 14 is propelled from the interior of the shaft 10 to the exterior thereof through the pit wall hole 24 under the operation of the pipe propulsion device 16. Reference numeral 26 indicates another tube similar to the tube 14 previously propelled into the ground by the tube propulsion device 16. The succeeding tube 14 is connected to the preceding tube 26 in the shaft 10 via a collar 28 provided at the tip thereof, and the other tube receives the thrust of the succeeding tube 14. And is propelled underground with the pipe. The tubes 14, 26 are propelled horizontally as in the example shown, or at an appropriate angle of inclination as required.

An excavator (not shown), such as a shield excavator, is typically mounted at the tip of the tube (not shown) that is initially propelled from the shaft 10 into the ground. The excavator is driven by the propulsion device 1 via the first tube and its subsequent tubes.
6, the ground 14 is excavated during this time to form a tunnel that defines a propulsion path for the pipe.

The pipe propulsion device 16 includes a table 30 on which the pipe 14 is mounted, at least one (two in the illustrated example) hydraulic jack 32 for applying thrust to the pipe 14, Push wheel 3 for transmitting the thrust of jack 32 to pipe 14
4 is included. The tube 14 mounted on the mounting table 30 is propelled on the mounting table 30 via the push ring 34 by the extension operation of the hydraulic jacks 32, as described in detail later.

The mounting table 30 is formed of a plate-like body having a rectangular planar shape as a whole, and is disposed on the shaft bottom 18 of the shaft. The mounting table 30 has a pair of rails 36 parallel to each other. The two rails 36 support the tube 14 substantially coaxially with the preceding tube 26 and slidably in the extending direction of the two rails 36. The mounting table 30 may be any as long as it supports the tube 14 so as to be movable, and is not limited to the illustrated example. For example, the mounting table 30 is connected to a pair of H
It can be formed with shaped steel. In this case, the two H-sections have a mutual spacing smaller than the outer diameter of the tube 14, and the opposite edges of the two H-sections slidably support the tube 14 in parallel with them.

A part of both contracted hydraulic jacks 32 is disposed underground. In the example shown, the majority of the cylinders 38 of each hydraulic jack are located horizontally in the ground 14 at intervals from each other and extend in a direction opposite to the direction in which the tubes 14 are propelled. The remaining part of the cylinder 38 and the rod 40 extending from the remaining part project from the ground 14 into the shaft 10.

By arranging a part of the hydraulic jack 32 of the pipe propulsion device underground, the hydraulic jack 32 is set up in the shaft 1
Thus, the space required in the shaft when it is disposed inside the shaft can be reduced. As a result, the shaft 10
It is possible to obtain an enlarged working space for the work of propelling the pipe 14 by the pipe propulsion device 16 in the inside, and thereby it is possible to improve the work efficiency, the work environment, and the like.

[0016] By securing the enlarged working space, for example, when a muddy shield is used as an excavator mounted on the first pipe, the muddy shield generated as the propulsion distance of the excavator increases. Thus, the work of attaching and detaching the sludge pipes for extending and extending the sludge pipes extending into the shaft 10 through a plurality of succeeding pipes can be performed easily and easily. Also, for example, the pipe 1
4, 26 can be easily and safely performed, and the work of hanging the pipe from the ground onto the mounting table 30 in the shaft 10 can be easily and safely performed.

The hydraulic jack 32, when viewed in a contracted state, may be arranged so that all of it, that is, all of the cylinder 38 and all of the rods 40 protruding from the cylinder are in the ground 14. According to this, a wider working space can be obtained.

In the illustrated example, each cylinder 38 is mounted on the ground 1
4 is accommodated in a cylindrical casing 42 which is open at one end and which is open at one end, whereby most of the cylinders are disposed underground. Each casing 42 extends into the ground through a circular hole 44 provided in the casing 20 of the shaft 10, and its open end is open to the inside of the shaft 10.

An end plate 46 defining one end of each cylinder 38 is in contact with the open end surface of each casing 42. Each casing 42 is welded to the casing 20 of the shaft 10 at its open end. Thus, each hydraulic jack 32 can apply a propulsive force to the pipe 14 by an extension operation in which the rod 40 extends from the cylinder 38 using the shaft wall 22 of the shaft as a reaction force carrier.

The end plate 46 of the cylinder can be fixed to the open end of the casing 42. According to this, even when the rod 40 of the hydraulic jack 32 retracts into the cylinder 38, the reaction force can be applied to the pit wall 22. It is desirable that the manner of fixing the hydraulic jack 32 to the casing 42 be releasable. According to this, after using the hydraulic jack 32, the hydraulic jack 32 can be easily removed from the inside of the casing 42.

In order to increase the ability to carry the reaction force, a block 48 can be interposed between the end plate 46 of the cylinder 38 of the hydraulic jack and the casing 20 of the shaft.

The block 48 is formed of a tubular body surrounding the open end of the casing 42 projecting into the shaft 10. The block 48 has one end surface 49 that contacts the end plate 46 of the hydraulic jack cylinder and the other end surface 50 that matches and contacts the curved surface of the shaft 20 of the shaft. According to this, when the hydraulic jack 38 is extended, a larger external force that the end plate 46 of the cylinder 38 receives from the pipe 14 can be transmitted to the casing 20 (pit wall 22) of the shaft via the block 48. Therefore, a larger reaction force can be taken.

The block 48 can be fixed to the shaft 20 by, for example, welding, and the cylinder end plate 46 is preferably releasably fixed to the block 48. Thus, as described above, the shaft wall 22 of the shaft can be used as a reaction force support during the contraction operation of the hydraulic jack 32.
2 can be easily removed.

Each hydraulic jack 32 can be a multi-stage jack instead of a single-stage jack as in the illustrated example.

As shown in FIG. 4, a cylindrical casing 42 for accommodating all or a part of the hydraulic jack 32 is provided.
Prior to the installation of the pipe propulsion device 16 in the shaft 10,
By being pressed into the ground 14 outside from the inside of the shaft 10 through a hole 44 provided in advance in the casing 20 of the shaft, the shaft can be buried underground. Press-fitting of the casing 46 can be performed using a suitable hydraulic jack 52. In order to reduce the press-in resistance, the casing 46
Has a tapered closed end. In the case where the casing 46 has a relatively large length with respect to the diameter of the shaft 10 as in the illustrated example, for example, three cylindrical members having relatively short lengths are sequentially pressed into the ground. In addition, by sequentially welding the succeeding cylinder member to the cylinder member press-fitted in advance, the three cylinder members connected to each other can be buried underground as the casing 46.

The rod 40 of each hydraulic jack 32 is connected at its end to a push ring 34.

The pressing ring 34 has a concave groove (not shown) which is opened downward at the bottom thereof. These grooves are provided on the mounting table 30 at a distance from each other, and respectively engage with two protrusions (not shown) extending in the propulsion direction of the tube 14. Therefore, when the hydraulic jacks 32 are extended or contracted, the push ring 34 slides on the mounting table 30 along the protrusions under the pressing force or the pulling force of the hydraulic jacks 32.

The tube 14 mounted on both rails 36 of the mounting table 30 receives the pressing force from the pressing wheel 34 and slides on both rails 36 toward the other tube 26 that has been propelled earlier. . The pipe 14 is further propelled through the push wheel 34 by stopping the operation of both hydraulic jacks 32 for interconnecting the pipes 14 and 26 and then activating the hydraulic jack again, so that (See FIGS. 2 and 3).

The illustrated push ring 34 is preferably a tube 14
Has a tip 35 which is received within the end of the tube when exerting a pressing force on the tube. Further, the pressing ring 34 preferably has a through hole (not shown). The through-hole has an axis coaxial with the axis of the tube 14 on the rail 36, and behind the through-hole is a means for confirming that the tube 14 is being propelled in a predetermined direction, for example, a transit. The surveying instrument 54 is arranged.

Each hydraulic jack 32 can be fixed to the mounting table 30 via a suitable member (not shown) instead of the illustrated example. In this case, the mounting table 30 bears the above-mentioned reaction force accompanying the operation of the hydraulic jack 32. Also, in this case, the mounting table 30 is provided on the shaft wall 22 or the bottom wall 1 of the shaft.
8 is desirably fixed.

After completion of the propulsion of the pipe 14, the shaft 1
Sometimes the tube is propelled from inside 0 in the opposite direction. In this case, after or before the completion of the propulsion of the pipe 14, another casing 42 is disposed in the ground opposite to the casing 42 currently disposed in the ground in the same manner as described above. Can be. The casing 42 can be buried without removing it.

The hydraulic jack 32 extending from the inside of the shaft to the outside of the shaft through the casing 20 of the shaft,
The casing 20 of the shaft 10 is prevented from rising. More specifically, during the propulsion of the pipe, the bottom ground 18 of the shaft 10
Of the chemical liquid injected for improving the ground around the holes 24 and 44 provided in the casing 20 of the vertical shaft, and which flows under the ground 18 and acts on the ground. The rise of the casing 20 of the vertical shaft caused by receiving a partial pressure or the like of the chemical solution is prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view of a pipe propulsion device of the present invention disposed in a vertical shaft.

FIG. 2 is a partial cross-sectional plan view of the pipe propulsion device after propelling a pipe in a shaft.

FIG. 3 is a partial longitudinal sectional view of the pipe propulsion device after propelling a pipe in a shaft.

FIG. 4 is a partial plan sectional view showing another means for fixing a casing accommodating a part of the hydraulic jack to a shaft of a vertical shaft.

FIG. 5 is a partial plan cross-sectional view of the casing for press-fitting a casing for accommodating a part of the hydraulic jack into the ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vertical shaft 14 Pipe 16 Pipe propulsion device 22 Vertical shaft wall 30 Pipe mounting table 32 Hydraulic jack 34 Press ring

Claims (2)

[Claims] 1. A device for propelling a pipe from a shaft into the ground, comprising: a stand for mounting the tube, disposed in the shaft, and at least one hydraulic jack. A hydraulic jack for applying thrust to the pipe, all or a part of which is disposed in the ground and the pit wall of the shaft is a reaction force carrier, and movably attached to the mounting table. And a push ring for transmitting the thrust of the hydraulic jack to the pipe. 2. A device for propelling a pipe from a shaft into the ground, comprising: a stand for placing the tube, disposed in the shaft, and at least one hydraulic jack. All or a part thereof is disposed underground and the mounting table is a reaction force carrier, a hydraulic jack for applying thrust to the pipe, and movably attached to the mounting table,
A pipe propulsion device including a push wheel for transmitting the thrust of the hydraulic jack to the pipe.