JP2729892B2 - Backstay disassembly method of pile driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for disassembling and assembling a backstay when assembling and disassembling a pile driver.

[0002]

2. Description of the Related Art At the time of assembling / disassembling work of a three-point support type pile driver, assembling / disassembling work of a back stay is performed simultaneously with a leader. The assembling work uses the lower leader attached to the pile driver body as a crane, assembles the upper leader to the required length in a horizontal state on a gantry placed on the ground, and then separately attaches it to the middle part of the upper leader. The upper end of the backstay assembled to the required length is rotatably mounted.

[0003] A stay cylinder provided at the lower end of the back stay is extended to a length that can withstand the bending moment when the leader is raised and lowered, and the tip is grounded to a position wider than the width of the vehicle body.

In this state, the lower leader is tilted forward to advance the pile driver main body, the lower leader is connected to the upper leader assembled on the gantry, and the back stays have their ends grounded to the sides of the vehicle body. In this state, the reader is gradually raised from the horizontal state to about 80 degrees.

[0005] At this time, since the back stay is suspended from the middle portion of the leader, when the lower end portion is separated from the ground, the back stay swings sharply right below the suspended position due to its own weight, and the leader or the back stay is suspended. There is a risk of accidents such as collision with the crawler and damage.Therefore, the stay cylinder provided at the lower part of the back stay is extended and retracted according to the standing of the leader so that the lower ends of both back stays do not separate from the ground. While maintaining the ground state.

In addition, a ball seat or a universal joint is provided at the lower end of the stay cylinder so as to be able to generally adjust the angle of the leader during the pile driving operation. When the stay rises, the lower end of the back stay tends to rotate around a ball seat or a universal joint.

However, since the center of rotation of the backstay and the center of rotation of the leader are different, the lower end of the backstay slides on the ground as the leader stands, or the ball seat or the universal joint suddenly rotates or the ground stops. Or may be cut into
Also, the sudden fluctuation of the load may cut the wire for raising and lowering the leader, or damage the ball seat. This operation places a greater burden on the user.

Then, after the reader is raised to a predetermined angle with the lower ends of both back stays grounded,
The back stay is pulled up to the mounting position on the outrigger beam by a stay pull-in wire stretched from the top sheave of the leader through the sheave under the back stay to the stay attaching / detaching device provided on the outrigger beam, and fixed with bolts etc. Work is performed, but at this time, the grounding position of the backstay, the direction of wire hooking, and the backstay mounting position are not in a straight line but are separated from each other. In this state, the lower end of the back stay must be pulled outward by several people in order to avoid a collision or contact with a crawler or the like because a moment to move is applied.

In order to solve these problems, for example, as shown in Japanese Utility Model Publication No. 58-12914, a backstay guide and protection device is provided outside the crawler,
As shown in Japanese Utility Model Laid-Open Publication No. 60-148347, there is an apparatus in which an arm is extended to the side of a vehicle body and the arm is rotated in the width direction of the vehicle body to guide a backstay.

[0010]

However, the guide and protection device on the outer side of the crawler becomes a hindrance at the time of work or transportation, and requires labor for attaching and detaching it. In addition, the guidance by the arm requires a large space in the width direction at the time of assembling and disassembling since the arm follows an arc trajectory.

It is an object of the present invention to provide a method for disassembling and assembling a backstay which does not require synchronizing the expansion and contraction operation of the backstay when the leader is raised and lowered.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a stay attaching / detaching device disposed on an outrigger beam when a leader is disassembled and assembled , and a stay attaching / detaching device.
A backstay disassembly method for a pile driver, in which a lower end of the backstay is attached to and detached from a stay support on an outrigger beam using a stay pull-in wire stretched between the device and the top sheave of the leader, The lower end of the back stay is supported by a truck arranged on the ground, and the truck is moved in the longitudinal direction of the vehicle body as the leader moves up and down.

[0013]

[Operation] This allows the bogie to move in the front-rear direction while supporting the lower end of the back stay as the leader moves up and down, so that it is not necessary to synchronize the expansion and contraction operation of the back stay during the up and down movement of the leader. When the back stay is pulled up to the mounting position on the outrigger beam by the stay pull-in wire, the trolley can be moved to near the mounting position by expanding and contracting the stay cylinder, so that the back stay does not swing toward the center of the vehicle body.

[0014]

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

FIGS. 1 to 5 show a first embodiment of the present invention. In a three-point support type pile driver 1, a leader 4 can be raised and lowered on a front bracket 3 at a front portion of a vehicle body 2 in the longitudinal direction of the vehicle body. And the raised leader 4 is supported from the rear side of the vehicle body 2 by two back stays 5 and 5.

Outrigger beams 6 and 6 are provided on the rear side of the vehicle body 2, respectively, and front jacks 7 and 7 are provided on the front side of the front bracket 3, respectively. , 6, the outrigger jacks 8, 8 and the front jacks 7, 7 are extended to hold the vehicle body 2 horizontally.

The back stay 5 includes a stay cylinder 5a at a lower portion, and a ball seat 5b at a lower end of the stay cylinder 5a.
And the upper end 5c is suspended from the middle of the reader 4. The ball seat 5b has a spherical portion 5d formed at the lower end of the stay cylinder 5a, and a ball for rotatably supporting the spherical portion 5d. And a bottom plate portion 5f on which a receiving portion 5e is formed.

When the leader 4 is up and down, the two back stays 5 and 5 hold the ball seat 5b at the lower end to the back stay guide carts 9 and 5.
9, respectively, are raised and lowered together with the leader 4, and the backstay guide carts 9, 9 are moved on the ground along with the undulation.
Move forward and backward.

The backstay guide trolley 9 includes a frame 10
A three-wheeled vehicle having a pair of left and right wheels 11 and 11 on one side and one wheel 12 on the other side, and a support base 13 on which a ball seat 5b at the lower end of a stay cylinder 5a is mounted between the wheels 11 and 11 is mounted on a front-rear direction of the vehicle. It is provided to be able to swing.

The support base 13 has a concave portion 13a on the upper surface of which the bottom plate portion 5f of the ball seat portion 5b is placed, and a stopper 13b for fixing the bottom plate portion 5f, and the axle 11 of the wheels 11, 11 is provided.
a, 11a so as to be swingable and axles 11a, 1
The center line of 1a and the spherical portion 5d is formed so as to be coaxial.

The backstay guide cart 9 constructed as described above is arranged on both sides of the vehicle body 2 when the leader 4 is raised and lowered during the assembling and disassembling of the pile driver 1.

For example, when the leader 4 is to be erected during assembly, the bottom plate 5e at the lower end of the back stay 5 is placed on the support 13 of the back stay guide cart 9, and the bottom plate 5e is fixed by the stopper 13b. In this state, the support 13 is substantially perpendicular to the ground.

When the leader 4 is raised, the backstay 5 also rises, and the support 13 also swings and moves toward a horizontal state. Further, as the back stay 5 rises, the bottom plate 5e at the lower end of the back stay 5 moves in the front-rear direction of the vehicle body 2, and the wheels 11, 11 and 12 roll and follow this movement.

Therefore, it is not necessary to perform the operation of extending and retracting the two back stays 5, 5 in synchronization with the standing operation of the reader 4, and the burden on the operator can be reduced.

Further, the back stay 5 rotates about the axis of the axles 11a, 11a, which are the swing axes of the support base 13 when standing up, so that the spherical portion 5d of the ball seat 5b and the bottom plate 5 are rotated.
This prevents the stay cylinder 5a from being scratched without generating the twisting of e.

Further, the backstay guide cart 9 is mounted on the vehicle body 2.
If the direction of the cart 9 is set so as to move parallel to the outside of the pile, the pile driver 1 can be assembled and disassembled in a minimum necessary space.

Also, when the ball seat 5b is fixed to the upper surface of the outrigger beam 6 when the leader 4 stands up about 80 degrees, the direction of the backstay guide cart 9 is set in that direction, and it is pulled out from the winch. Stay pull-in
The Ya 15, outrigger beam 6 above via the guide sheaves 5f backstay 5 from the top sheave block 16
Stay retracting arm 1 which is a stay attaching / detaching device
Stretched linked to 7, close backstay guide carriage 9 outrigger beam 6 extends the stay cylinders 5a backstay 5, when reaches a predetermined position, the spherical seat portion 5b
Is separated from the backstay guide trolley 9, the ball seat 5b is pulled up to the mounting position 18 on the outrigger beam 6, and is fixed with bolts or the like.

Therefore, the back stay 5 is short in moving distance and does not interfere with the vehicle body 2 during the lifting operation, so that damage to the back stay 5 can be prevented.

Since the backstay guide cart 9 has wheels, it can be easily moved out of the way after assembly and disassembly.

When the reader 4 is disassembled for disassembly, the operation is performed in the reverse order.

FIGS. 6 and 7 show a back stay 20 having a bottom plate 20c provided at the lower end of a stay cylinder 20a via a joint 20b on a four-wheel back stay guide cart 21. Similarly, a second embodiment of the present invention in which the back stay 20 is disassembled and assembled is shown.

In each of the above embodiments, a three-wheeled and four-wheeled truck has been described. In the case of a two-wheeled truck, the directionality is worse than that of a three-wheeled and four-wheeled truck. A similar effect can be obtained by adding the correction.

[0033]

As described above, in the method for disassembling and assembling the backstay according to the present invention, the lower end of the backstay, which rises and falls with the rise and fall of the leader, is mounted on the bogie and moved in the vehicle longitudinal direction. Occasionally, it is not necessary to synchronize the extension / retraction operation of the backstay, and the burden on the operator can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a three-point support type pile driver.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view showing a backstay guide cart according to the first embodiment.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a plan view showing a backstay guide cart according to a second embodiment.

FIG. 7 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Three-point support type pile driver, 2 ... Body, 4 ... Leader, 5, 2
0: back stay, 5a, 20a: stay cylinder, 5
b: ball seat, 5f: bottom plate, 6: outrigger, 9, 2
1. Backstay guide cart

Claims (1)

(57) [Claims] 1. A stay attaching / detaching device disposed on an outrigger beam when disassembling and assembling a leader , and a stay attaching / detaching device.
A backstay disassembly method for a pile driver, in which a lower end of the backstay is attached to and detached from a stay support on an outrigger beam using a stay pull-in wire stretched between the device and the top sheave of the leader, A method for disassembling and assembling a backstay of a pile driver, wherein the lower end of the backstay is supported by a bogie arranged on the ground, and the bogie is moved in the longitudinal direction of the vehicle body as the leader moves up and down.