JPH0352260Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a leader bending and front jacking device for a pile driver, which has a mechanism that holds the leader vertically during operation and bends the leader during transportation.

[Conventional technology]

As shown in FIGS. 1 and 2, the pile driver used for civil engineering foundation work includes a leader 2, an upper running body 3, a leader support frame 4, a stay cylinder 5, an outrigger cylinder 6, Front attachment 7
etc., and the leader 2 is an upper leader 2a.
and lower leader 2b, and both leaders 2a, 2
b are connected like a hinge so that they can be bent around the pin 8, and during work to facilitate movement at the work site, the pile driver 1 is connected as shown in FIG.
The leader 2 is arranged vertically, and when transported, the leader 2 is bent as shown in FIG. 2, so that the height and length of the aircraft body can be kept within transport limits.

As shown in FIG. 3, the bending device 9 for the upper leader 2a and the lower leader 2b is configured such that the bottom end of a hydraulic cylinder 10 disposed inside the upper leader 2a is rotatably attached to the upper leader 2a by a pin 11. At the same time, the rod end 10 of the hydraulic cylinder 10
Bracket 1 with a provided at the upper end of the lower leader 2b
2 with a pin 13 so as to be rotatable.

When storing the leader 2 to transport it, remove the tightening bolts (not shown) of the upper leader 2a and lower leader 2b, and reduce the stay cylinder 5 until the leader 2 is in a substantially horizontal position. After
The hydraulic cylinder 10 is extended, the lower leader 2b is bent substantially vertically, the lower leader 2b and the leader support frame 4 are connected by the link 14, and the outrigger cylinder 6 is contracted to complete the transportation posture.

If you want to change to the working position from this state, follow the steps in reverse to the above, and when working, align the pile cores while extending and contracting the stay cylinder 5 and hydraulic cylinder 15, and extend the front jack 16 and outrigger cylinder 6. They were supporting leader 2 and stabilizing pile driver 1.

[The problem that the idea aims to solve]

However, in addition to the hydraulic cylinder 10 that bends the lower leader 2b when switching between the transportation posture and the working posture, a front jack 16 is separately provided to receive the reaction force during working, especially when the auger is pulled out. That is, since two hydraulic cylinders, one for bending the leader and one for jacking the front, and their operating circuits must be provided, the structure is complicated and expensive, and improvements are needed.

The present invention was made in view of the above, and includes:
The present invention provides a device that uses a hydraulic cylinder to both bend and pull back the leader and to jack it forward during work.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, the present invention adopts a working posture in which the foldable leader into an upper leader and a lower leader is in a substantially vertical shape, and a transportation posture in which the upper leader is in a substantially horizontal shape and the lower leader is in a substantially vertical shape. In a pile driver that is arranged to be able to be bent up and down, a bracket is provided at the lower end of the upper leader, and an inner cylinder that protrudes and retracts from the lower end of the lower leader is slidably fitted into the upper leader, and is fitted into the inner cylinder. Set up a bracket,
Both ends of a hydraulic cylinder disposed in the lower leader are rotatably fixed to both brackets with pins, and the lower leader and the inner cylinder are engaged with a locking pin at the retracted position of the hydraulic cylinder. This is characterized in that a pin hole for fastening is provided in the lower leader and the inner cylinder.

[Effect]

Therefore, when retracting the leader to the transportation position, contract the hydraulic cylinder, fit the inner cylinder into the lower leader, lock the inner cylinder to the lower leader with the locking pin, and then move the inner cylinder to the lower leader. After removing the tightening bolt of the lower leader and contracting the stay cylinder until the leader becomes approximately horizontal, the hydraulic cylinder is extended and the lower leader is bent approximately vertically.

To change the working position from this state, contract the hydraulic cylinder, rotate the lower leader until it is approximately horizontal, extend the stay cylinder until the leader is approximately vertical, and then move the upper and lower leaders together. Fasten the inner cylinder to the leader with a tightening bolt, remove the locking pin that locks the inner cylinder to the lower leader, extend the hydraulic cylinder, advance the inner cylinder from inside the lower leader, and ground the inner cylinder. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. Note that the same members as in FIGS. 1 to 3 will be described with the same reference numerals.

The leader bending and front jacking device 20 includes a hydraulic cylinder 21 disposed in a lower leader 2b which is provided in the upper leader 2a so as to be bendable around a pin 8, and a hydraulic cylinder 21 that is slidably fitted into the lower leader 2b. and an inner cylinder 22 that protrudes and retracts from the lower end of the lower leader 2b. The hydraulic cylinder 21 has its rod end 21a inserted into a pin hole 23a provided in a bracket 23 fixed to the lower end of the upper leader 2a.
4, and the bottom end 21b is pivoted to a pin hole 25a formed in a bracket 25 provided at the upper end of the inner cylinder 22 with a pin 26.

The lower leader 2b and the inner cylinder 22 are attached to the lower leader 2b and the inner cylinder 22 when the hydraulic cylinder 21 is in the contracted position.
Pin holes 27 and 28 for locking with locking pins 29 and 29 are bored, respectively. In addition, 3
0 is a tightening bolt that integrally fixes the upper leader 2a and the lower leader 2b.

Therefore, when storing the leader 2 to the transportation position, the hydraulic cylinder 21 is contracted, the inner cylinder 22 is fitted into the lower leader 2b, and the inner cylinder 22 is attached to the lower leader 2b with the locking pin 29. to lock. Then, after removing the tightening bolts 30 of the upper leader 2a and lower leader 2b and reducing the stay cylinder 5 until the leader 2 is in a substantially horizontal position, the hydraulic cylinder 21 is extended to move the upper leader 2b into a substantially vertical position. It is bent into a shape, fixed to the leader support frame 4 with links 14 as shown in FIG. 2, and the outrigger cylinder 6 is contracted to complete the transportation posture.

When changing from this state to the working position, contract the hydraulic cylinder 21, rotate the lower leader 2b until it is approximately horizontal, extend the stay cylinder 5 until the leader 2 is approximately vertical, and then The upper leader 2a and the lower leader 2b are fastened with tightening bolts 30.

In the pile driving work, the locking pins 29, 29 that lock the inner cylinder 22 to the lower leader 2b are pulled out, the hydraulic cylinder 21 is extended, the inner cylinder advances from inside the lower leader, and the inner cylinder Ground the reader 2
Use as a support jack.

[Effect of idea]

As described above, the present invention has a working posture in which the foldable leader into an upper leader and a lower leader is in a substantially vertical shape, and a transportation posture in which the upper leader is in a substantially horizontal shape and the lower leader is in a substantially vertical shape. In a bendable pile driver, both ends of the hydraulic cylinder installed in the lower leader are pinned to the bracket at the lower end of the upper leader and the bracket of the inner cylinder that extends and retracts from the lower end of the lower leader. Since the lower leader and the inner cylinder are rotatably fixed, a pin hole is drilled in the lower leader and the inner cylinder to lock the lower leader and the inner cylinder with a locking pin when the hydraulic cylinder is in the retracted position. 1
The actual hydraulic cylinder can bend and pull back the leader, and can also be used as a front jack during work, and switching to the front jack can be easily done by removing the locking pin. Moreover, since there is only one hydraulic cylinder, there is only one operation circuit, which simplifies the structure.

[Brief explanation of the drawing]

Figure 1 is a working posture diagram showing a conventional pile driver, Figure 2
FIG. 3 is an explanatory diagram showing the folding state of the leader by the leader bending device, and FIGS. 4 and 5 are the leader bending and front jacking device of the pile driving machine according to the present invention. FIG. 4 is a cross-sectional front view in a working posture, FIG. 4 is a cross-sectional side view, and FIG. 5 is an explanatory view showing the leader in a folded state. DESCRIPTION OF SYMBOLS 1...Pile driver, 2...Leader, 2a...Upper leader, 2b...Lower leader, 20...Leader bending and front jacking device, 21...Hydraulic cylinder, 2
2... Inner cylinder, 23, 25... Bracket, 24,
26...Pin, 27, 28...Pin hole, 29...
Locking pin.

Claims (1)

[Scope of utility model registration request] A pile in which a leader that can be folded into an upper leader and a lower leader is arranged so that it can be bent up and down in a working position in which the upper leader and a lower leader are in a substantially vertical shape, and in a transportation posture in which the upper leader is substantially horizontal and the lower leader is substantially vertical. In the striking machine, a bracket is provided at the lower end of the upper leader,
An inner cylinder that protrudes and retracts from the lower end of the lower leader is slidably fitted into the lower leader, and a bracket is provided on the inner cylinder, and both ends of a hydraulic cylinder disposed within the lower leader are fitted into the brackets. A pin hole is formed in the lower leader and the inner cylinder for rotatably locking the shaft with a pin and locking the lower leader and the inner cylinder with a locking pin at the retracted position of the hydraulic cylinder. A leader bending and front jacking device for a pile driver, which is characterized by: