JP2533826Y2 - Fluid jet device for pile driving - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] This invention is intended for the construction of super-large structures such as long span bridges and large-scale ground construction at airports, etc., by using hollow piles such as hollow pipes and round steel cells. The present invention relates to a fluid jet device used for a pile driving operation to penetrate.

[0002]

2. Description of the Related Art In order to improve the ground, in a pile driving operation in which a hollow pile such as a hollow pipe penetrates into the ground, generally, an exciter or a vibrator is mounted on an upper end of the pile to apply a vibration to the pile. Penetration by weight and vibration. When a hard layer is interposed in the ground and penetration efficiency is poor, nozzles are provided at predetermined intervals around the tip of the pile as an auxiliary means for efficiently performing the pile driving work. 2. Description of the Related Art A fluid jet device that jets a fluid such as water or compressed air into a ground in a direction parallel to a penetration direction, relaxes the ground, weakens penetration resistance, and facilitates work is used.

[0003] However, since the jet jet of the fluid ejected from the nozzle diffuses radially from the nozzle,
Even if the fuel is injected in parallel with the penetration direction of the pile, the ground cannot be loosened over the entire periphery of the tip of the pile and the penetration resistance cannot be significantly reduced. It was difficult to improve work efficiency.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and loosens the ground over the entire periphery of the tip of the pile to greatly reduce the penetration resistance and increase the pile driving speed. It is an object of the present invention to provide a pile driving fluid jet device capable of efficiently performing a pile driving operation.

[0005]

In order to solve the above-mentioned problems, a fluid jet device for driving a pile according to the present invention has nozzles for injecting a high-pressure fluid at predetermined intervals on the periphery of the tip of a hollow pile. And the direction of nozzle fluid ejection before the fluid jet
The projection on the plane including the perimeter indicates the adjacent nozzle on the perimeter.
It is inclined obliquely downward so as to be in the direction along the arc between them.

[0006]

[Action] During Kuida work, high pressure fluid from the nozzle, the
The projection of the jet onto the plane is between adjacent nozzles on the periphery
Since the jet is ejected obliquely downward so as to follow the arc, the jet jet of the fluid loosens the ground over the entire periphery of the tip of the pile. Therefore, the penetration resistance at the tip of the pile is reduced, and the penetration friction resistance between the side surface of the pile and the ground is also reduced, so that the driving speed of the pile is increased and the work efficiency is improved.

[0007]

FIG. 1 is an explanatory view of the configuration of a fluid jet device for pile driving according to an embodiment of the present invention. Here, the hollow pile 1 is vertically erected, and is vibrated by an exciter 2 mounted on an upper end of the pile 1 to penetrate the ground E vertically downward. Nozzles 4 are arranged at a predetermined interval P on the outer peripheral edge 3 of the tip of the pile 1 as shown in FIG. A pipe 5 is fixed on the outer surface of the pile 1 over the entire length of the pile 1, and a nozzle 4 is provided at a lower end of the pipe.
The upper end of the pipe 5 is connected to a high-pressure water distributor 8 via a flexible pipe 6 and a check valve 7. The high-pressure water distributor 8 is connected to a high-pressure water pump 10 driven by a motor 9 via a pressure regulator 11 and a check valve 12. The high-pressure water generated by the high-pressure water pump 10 and adjusted to a predetermined pressure by the pressure regulator 11 is distributed by the high-pressure water distributor 8,
It reaches the nozzle 4 through the flexible pipe 6 and the pipe 5, and is jetted from the nozzle 4 as a jet jet 13. High pressure water is
If the pressure is increased, the amount of water can be reduced.

As shown in FIGS. 2 and 3, the direction of injection of the high-pressure water from the nozzle 4 is projected onto a plane including the periphery.
To be a direction along the arcs between adjacent nozzles is inclined with respect to the vertical downward a penetration direction of the pile 1 by an angle alpha.
During Kuida work, from the nozzle 4 whirlpool 13 of the high pressure water for high-pressure water is jetted obliquely Me with respect to penetration direction only pile 1 angle α is throughout the periphery 3 of the tip of the pile 1 Ground E
Loosen. Therefore, the penetration resistance at the tip of the pile 1 is reduced,
Further, the penetration friction resistance between the side surface of the pile 1 and the ground E is reduced, so that the driving speed of the pile 1 is increased.

FIG. 4 is an explanatory view of the arrangement of the nozzles 4 according to another embodiment of the present invention. In this embodiment, the nozzles 4 are arranged on the inner peripheral edge of the lower end of the pile 1.

[0010]

[Effect of the Invention] As described above, the fluid jet device for pile driving of the present invention loosens the ground over the entire periphery of the tip of the pile, greatly reduces the penetration resistance, and increases the speed at which the pile is driven. Stakeout work can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a configuration of a fluid jet device for pile driving which is an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a nozzle arrangement state of a peripheral edge of a lower end of a pile.

FIG. 3 is an explanatory diagram of a jet direction of a fluid of a nozzle.

FIG. 4 is an explanatory view showing a nozzle arrangement of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile 3 Perimeter 4 Nozzle 5 Piping 6 Flexible piping 8 High-pressure water distributor 10 High-pressure water pump 11 Pressure regulator 13 Jet jet

Claims (1)

(57) [Scope of request for utility model registration] To 1. A hollow shaped pile tip perimeter, a fluid jet device for pile which is disposed a nozzle for injecting high pressure fluid at predetermined intervals, the direction of injection fluid in the nozzle, the flow
The projection of the body jet onto the plane containing the perimeter is adjacent to the perimeter on the perimeter.
A fluid jet device for pile driving, characterized in that the device is inclined obliquely downward so as to be in a direction along an arc between matching nozzles .