JP2001040665A - Pile driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give sufficient thrust to an auger screw, and to efficiently excavate even a hard ground. SOLUTION: A head member 7 is installed rotatably at the front end of a boom 4 for a crane car 1 in the horizontal direction. An expansion-contraction mechanism 9 mounted on the head member 7 is composed of the combination of an internal cylinder 10, in which an upper end is fixed to the head member 7, and an external cylinder 11 externally fitted so as to be able to be vertically moved to the internal cylinder 10. An earth auger device 16 is fixed onto the external cylinder 11 of the expansion-contraction mechanism 9, the expansion- contraction mechanism 9 is extended and moved by supplying oil pressure when an auger screw 24 is penetrated into a ground, and the auger screw 24 can be penetrated smoothly and efficiently even in the case of the hard ground by giving the auger screw 24 thrust in the screwing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driving device for excavating a vertical hole in the ground with an auger screw in order to construct a pile or the like or build a pillar in the ground.

[0002]

2. Description of the Related Art Generally, a pile or the like is constructed in the ground by using a pile driving device in which an auger screw is connected to an earth auger device attached to a boom of a crane truck. It excavates a hole and inserts an existing pile or the like into this vertical hole to construct a pile or the like. Such a pile driving device has the advantage that construction of a pile or the like can be performed without vibration and noise. is there.

[0003] Here, the pile driving device is provided with an earth auger device attached to the tip of a boom of a crane truck, and a pile driving device in which an auger screw is connected to the earth auger device, and a crane truck and a boom tip. A pile driving device of a type in which a leader is supported vertically, an earth auger device is attached to the reader so as to move up and down, and an auger screw is connected to the device, is known. There is an advantage that the leader can be omitted, the crane truck can be easily moved, and the workability is excellent.

In the above-described pile driving apparatus, when excavating a vertical hole in the ground by rotating an auger screw, excavation with high vertical precision is required.

That is, by rotating the auger screw, the auger screw bites into the ground with its own screw blade, and at the time of this biting, the tip of the auger screw moves to the side with less resistance in the ground. Therefore, the auger screw is inclined and enters the ground, and the vertical accuracy of the vertical hole is reduced.

The conventional guidance for excavating an auger screw in a pile driving device in which an earth auger device is attached to the tip of a boom of a crane truck is performed by controlling the boom contraction and the undulation angle with the lowering of the upper end of the auger screw. Is going.

[0007]

However, the method of controlling the direction of excavation only by the upper end of the auger screw is as follows.
It is very difficult and requires advanced technology, and it is difficult to increase the vertical accuracy of the vertical hole.

Further, it is necessary to apply a thrust to the auger screw for smooth excavation of the auger screw. However, in the conventional pile driving device described above, it is not possible to add a thrust corresponding to a change in soil quality. However, the method of attaching the weight to the earth auger device is not actually a means for adding sufficient thrust due to structural restrictions, and therefore, in the conventional pile driving device, especially in the case of a hard ground with an auger screw, There is a problem that the excavation efficiency is poor.

[0009] Therefore, an object of the present invention is to improve the vertical accuracy when excavating an auger screw, add a sufficient thrust to the auger screw, and efficiently excavate hard ground. It is an object of the present invention to provide a pile driving device which can perform the driving.

[0010]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a head member is attached to a tip of a boom of a crane truck so as to be swingable, and a head member is provided below the head member. An outer cylinder is mounted on a fixed guide member so as to be vertically movable, and a ground auger device is fixed to the outer cylinder.

According to a second aspect of the present invention, in the first aspect, an extension guide member is detachably attached to a lower end of the guide member fixed to a lower portion of the head member. is there.

According to a third aspect of the present invention, a head member is attached to a tip end of a boom of a crane truck so as to be swingable, and an inner cylinder fixed to a lower portion of the head member and an inner cylinder fixed to the lower end of the head member. An expansion / contraction mechanism is provided which is composed of a combination of outer cylinders which are externally fitted so as to be able to move up and down.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIGS. 1 and 2, a self-propelled crane truck 1 has a vehicle body 3 supported by a traveling means 2 capable of horizontal rotation of 360 °.
A telescopic boom 4 is mounted on the cylinder 5 so as to move up and down.

A mounting member 6 is mounted on the tip member 4a of the boom 4 so as to be swingable back and forth by pins 8 which are arranged laterally with respect to the front-rear direction of the crane truck 1, and a head is mounted on the lower surface of the mounting member 6. The member 7 is the crane truck 1
The telescopic mechanism 9 is mounted so as to be able to swing in the horizontal direction with a pin 8a attached to the front and rear direction of the head member 7 and extends downward by the supply of hydraulic pressure at a position below the lower surface of the head member 7. ing. Therefore, the extension mechanism 9 can swing in the front-rear direction and the lateral direction.

The expansion / contraction mechanism 9 is a combination of a square inner cylinder 10 having an upper end fixed to the head member 7 and a square outer cylinder 11 fitted to the inner cylinder 10 so as to be vertically movable from the lower end side. The inner cylinder 10 serves as a cylinder, into which a piston 12 is inserted so as to be movable up and down. The lower ends of the piston 12 and the outer cylinder 11 are connected via a rod 13 and a pin 14, and the piston 12 and the outer cylinder 11 is adapted to move up and down integrally, and a ground auger device 16 is fixed to the front outer surface of the outer cylinder 11.

At the upper end and the lower end of the inner cylinder 10, hydraulic supply outlets 15 and 15a for connecting with a hydraulic supply source installed on the vehicle body 3 of the crane truck 1 by a hose are provided. When hydraulic pressure is supplied from the discharge port 15, the piston 12 is pushed down and the outer cylinder 11 moves down. When hydraulic pressure is supplied into the inner cylinder 10 from the lower supply / discharge port 15 a, the piston 12 is pushed up and the outer cylinder The ascent / descent mechanism 11 moves upward, and thus the extension / contraction mechanism 9 performs the extension operation, and the earth auger device 16 fixed to the outer cylinder 11 moves up and down integrally with the outer cylinder 11.

The upper end of the earth auger device 16 and the inner cylinder 1
The sheaves 17, 18, 19, 20, 21 are attached to the lower end of the outer cylinder 11, the upper end of the outer cylinder 11, and the head member 7, respectively. The sheaves 18 and 19 of the head member 7, the sheave 20 of the inner cylinder 10, and the sheave 21 of the outer cylinder 11 are sequentially passed over, and the other end of the wire 22 is fixed to the outer cylinder 11. The arrangement of the wire 22 is caused by the sheave 17 and the head member 7 of the earth auger device 16 generated when the outer cylinder 11 and the earth auger device 16 move up and down.
Of the wire 22 between the sheaves 18 of the inner cylinder 10
The wire 22 does not hinder the vertical movement of the outer cylinder 11 and the earth auger device 16 and the lower limit of the lowering of the outer cylinder 11. Acts as a stopper for defining the position and as a safety device.

The pile driving device according to the first embodiment of the present invention has the above-described configuration, and is attached to the outer cylinder 11 of the telescopic mechanism 9 attached to the tip of the boom 4 via the attachment member 6 and the head member 7. The earth auger device 16 is fixed, and an auger screw 24 is connected to the output shaft 23 of the earth auger device 16. The auger screw 24 is positioned so that the auger screw 24 is grounded immediately above the excavation position by moving the crane truck 1 or operating the boom 4. By lowering the tip of the boom 4 in a state where the supply of the hydraulic pressure to the inner cylinder 10 is released, the inner cylinder 10 is placed in the outer cylinder 11 as shown by a two-dot chain line in FIG. Is contracted.

In the above state, the auger screw 24 is rotated by the activation of the earth auger device 16 and screwed into the ground.

When the auger screw 24 is screwed in, the supply / discharge port 15 at the upper end
When the hydraulic pressure is supplied from the piston, the piston 12 is pushed down, the extension mechanism 9 extends, and the outer cylinder 11 and the earth auger device 16 fixed thereto move downward integrally, whereby the auger screw 24 is pushed down and the screw is The thrust in the insertion direction is forcibly added.

The auger screw 24 rotates,
The screw blades penetrate into the ground by themselves, but when the ground is hard, the resistance increases and it becomes difficult to penetrate. At this time, the telescopic mechanism 9 is extended hydraulically and the screw is inserted into the auger screw 24 in the screwing direction. By forcibly adding the thrust of
In addition to the thrust due to the weight of the earth auger device 16, a strong thrust due to hydraulic pressure can be added, and the auger screw 24 can be efficiently penetrated into the ground. The reaction force is supported by the weight of the crane truck 1 via the boom 4.

Further, since the outer cylinder 11 and the earth auger device 16 fixed to the outer cylinder 11 move downward integrally with the inner cylinder 10 as a guide, the excavation of the auger screw 24 is guided linearly. As a result, the excavation accuracy of the auger screw 24 with respect to the vertical direction can be improved.

As shown by the solid line in FIG. 2, when the telescopic mechanism 9 extends to the maximum by its stroke, the supply of hydraulic pressure to the inner cylinder 10 from the supply / discharge port 15 at the upper end is stopped, and the boom 4
The inner cylinder 10 is lowered by the falling and shrinking of the inner cylinder 10. At this time, hydraulic pressure may be supplied to the inner cylinder 10 from the supply / discharge port 15 at the lower end.

After returning the expansion / contraction mechanism 9 to the contracted state, hydraulic pressure is again supplied to the inner cylinder 10 from the supply / discharge port 15 at the upper end to extend the same, and a thrust in the screwing direction is applied to the auger screw 24 in the same manner as described above. By repeating this, auger screw 2
4 can be efficiently penetrated into the ground to excavate a vertical hole.

When removing the auger screw 24, the auger screw 24 may be lifted while removing the soil.
What is necessary is just to pull out by controlling the raising and extension of this, and at this time, the expansion-contraction mechanism 9 should just be in a contracted state.

Next, in a second embodiment shown in FIG. 3, a tip member 4a of a boom 4 of a self-propelled crane truck has
A mounting member 6 is mounted so as to be able to swing back and forth by a pin 8 arranged in a lateral direction with respect to the front-rear direction of the crane truck, and a head member 7 is mounted on a lower surface of the mounting member 6 with a pin extending along the front-rear direction of the crane truck. At 8a, a rectangular guide member 31 is vertically fixed at a position near the rear on the lower surface of the head member 7,
An outer cylinder 32 is attached to the guide member 31 so as to be vertically movable, the earth auger device 16 is fixed to the outer cylinder 32, and a stopper 33 for preventing the outer cylinder 32 from being detached is removed from the lower end of the guide member 31. It is fixed as possible.

The guide member 31 is swingable in the front-rear direction and the lateral direction, and the outer cylinder 32 and the earth auger device 16 fixed thereto are vertically movable along the guide member 31. Is wound around a sheave 35 attached to the upper end of the earth auger device 16, and then wound around a winch of a crane truck along the boom 4. Can be moved up and down along the guide member 31.

At the lower end of the guide member 31, a separately prepared extension guide member 36 may be sequentially added. The guide member 31, the extension guide member 36, and the extension guide member 36 are connected to each other by providing a protrusion at one end and a recess into which the protrusion fits at the other end, and fitting the protrusion with the recess. The portions may be connected by pins 37, and when the extension guide member 36 is added to the guide member 31, a vertically long leader can be formed. By removing the stopper 33, the outer cylinder 32 and the The vertical movement stroke of the fixed earth auger device 16 can be lengthened.

The pile driving device according to the second embodiment has the above-described configuration, and has the outer cylinder 3 of the guide member 31 mounted to the tip of the boom 4 via the mounting member 6 and the head member 7.
2 and an auger screw 24 is coupled to an output shaft 23 of the earth auger device 16 so that the auger screw 24 is grounded immediately above the excavation position by moving the crane truck or operating the boom 4. Position
With the outer cylinder 32 positioned at the upper end of the guide member 31, the auger screw 24 is rotated by the activation of the earth auger device 16 and screwed into the ground.

When the auger screw 24 is screwed, the auger screw 24 is pushed down by the weight of the earth auger device 16 and the outer cylinder 32, and a thrust in the screwing direction is applied.

The excavation of the auger screw 24 is guided by the guide member 31 so that the outer cylinder 32 and the earth auger device 16 fixed thereto move downward integrally, so that the excavation of the auger screw 24 is linearly guided. That means
The excavation accuracy of the auger screw 24 with respect to the vertical direction can be improved.

When the outer cylinder 32 reaches the lower end of the guide member 31, the guide member 31 is lowered by the boom 4 falling and contracting, and the outer cylinder 32 is positioned at the upper end of the guide member 31. By applying thrust in the screwing direction to the screw 24 and repeating this, the entire length of the auger screw 24 can efficiently penetrate into the ground to excavate the vertical hole.

When the auger screw 24 is removed, the auger screw 24 is rotated in the reverse direction by the earth auger device 16, and the raising and extension of the boom 4 is controlled in accordance with the rise of the auger screw 24, and the auger screw 24 is removed from the vertical hole. The auger screw 24 may be removed.

[0035]

As described above, according to the first aspect of the present invention, the head member is attached to the tip of the boom of the crane truck so as to be swingable, and the outer cylinder is mounted on the guide member fixed to the lower portion of the head member. The earth auger device is fixed to this outer cylinder so that it can be moved up and down, so that the guide member can guide the excavation of the auger screw that is screwed into the ground and excavates the vertical hole, and the excavation with respect to the vertical direction of the auger screw is performed. Accuracy can be greatly improved.

According to the second aspect of the present invention, the head member attached to the tip of the boom of the crane truck is composed of a combination of an outer cylinder fitted externally so as to be vertically movable with respect to the inner cylinder. Attach a telescoping mechanism that extends with
Since the earth auger device is fixed to the outer cylinder of the telescopic mechanism, a thrust in the screwing direction can be forcibly added to the auger screw which is screwed into the ground to excavate a vertical hole by extending the telescopic mechanism. Since the telescopic mechanism is extended by hydraulic pressure, a large pushing force and stroke can be generated using the weight of the crane as a reaction force, and the auger screw can smoothly and efficiently enter the ground even when the ground is hard. As a result, the efficiency of the pile construction work can be improved, and the auger screw is guided using the inner cylinder of the extension mechanism as a guide, so that the excavation accuracy of the auger screw with respect to the vertical can be improved.

[Brief description of the drawings]

FIG. 1 is an overall front view showing a first embodiment of a pile driving device.

FIG. 2 is an enlarged front view showing a main part of the pile driving device in the same as above.

FIG. 3 is an enlarged front view showing a main part of a pile driving device according to a second embodiment of the pile driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crane truck 4 Boom 6 Attachment member 7 Head member 8 Pin 9 Expansion mechanism 10 Inner cylinder 11 Outer cylinder 12 Piston 16 Earth auger device 22 Wire 24 Auger screw 31 Guide member 32 Outer cylinder 33 Stopper 34 Wire 36 Extension guide member

Claims (3)

[Claims] 1. A head member is attached to a tip of a boom of a crane truck so as to be swingable, an outer cylinder is attached to a guide member fixed to a lower portion of the head member so as to be able to move up and down, and an earth is attached to the outer cylinder. A pile driving device characterized by fixing an auger device. 2. The pile driving device according to claim 1, wherein an extension guide member is detachably attached to a lower end portion of the guide member fixed to a lower portion of the head member. 3. A crane truck with a head member attached to the end of the boom so as to be swingable, and an inner cylinder fixed to a lower portion of the head member and a vertically movable member with respect to the inner cylinder. It consists of a combination of outer cylinders
A pile driving device, comprising: a telescopic mechanism that extends and moves by supply of hydraulic pressure, and an earth auger device fixed to an outer cylinder of the telescopic mechanism.