JPH0447022A - Pile driver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention meshes a chain stretched along a leader with a drive sprocket provided in a working device for performing work such as excavation and press-fitting of piles. The present invention relates to a pile driver that raises and lowers the working device along a leader by rotating the drive sprocket, and particularly relates to a structure for transporting the pile driver.

(Prior Art and Problems to be Solved by the Invention) As shown in Fig. 6, a conventional pile driver has a front bracket attached to the front part of the pile driver main body l so as to be rotatable in the vertical direction by a hydraulic cylinder 2. 3, and attach the leader 4 to the front bracket 3.
(5 is the front bracket 3)
An arm 9 is fixed to the arm, and the leader 4 is rotatably connected to the arm by a pin), and two backstay cylinders 6 on the left and right are interposed between the leader 4 and the main body l, and the leader 4 is
A working device M7, which supports the pile almost vertically and has a motor and a chuck device for press-fitting the pile, is attached to the leader 4 so as to be movable up and down along a guide 8 attached to the leader 4.

Since this pile driver was carried into and out of the construction site by trailer transportation, the leader 3 had to be laid horizontally forward and disassembled. However, this requires time and effort to transport and set up the start of work, and requires an auxiliary crane when disassembling.

In order to solve this problem, as shown in FIG. 7, the leader 4 can be disassembled by retracting the hack stay cylinder 6 and tilting the leader 4 backward so that it is in a horizontal position above the main body l. Pile driving machines have appeared that eliminate the need for work and make it possible to transport whole piles onto trailers. Although it is shown in a simplified manner in FIG. 7, when defeating leader 4,
Remove the backward fall prevention rod provided between the main body l and the leader 4, and slide and push up the connecting part lO between the backstay cylinder 6 and the leader 4 with a cylinder (not shown) to a predetermined angle. 4 is tilted backward, then the backstay cylinder 6 is retracted, and the A-frame (not shown) is further brought down to make the leader 4 horizontal. Further, the support point 11 is also lowered or moved forward as required.

However, a pile driver with such a long leader 4 has height restrictions when working under elevated wires or bridges, so
As shown in the figure, a short leader 12 is attached in place of the leader 4 to carry out the work. In this case, the dimensions of the backstay cylinder 6 are set to match the long leader 4, so in the case of a short leader 12, the backstay cylinder 6
Or it's too long to install. For this reason, in the case of a short leader 12, the leader 12 is fixedly coupled to the front bracket 3 by not only coupling using the bin 5 but also coupling using a coupling portion M13, which will be described later, using a pin. Additionally, a chain 14 is provided along the leader 12.
A work equipment that has a drive sprocket 15 that tensions the chain 14 and meshes with the chain 14! The i7 is attached to be movable up and down along a guide 8 provided along the leader 12, and the working device 7 is raised and lowered by rotating the drive sprocket 15 by a hydraulic motor (not shown) mounted on the working device 7.
Works such as excavation with an auger attached to the working device 7, pushing of steel pipes or concrete pipes with or without deep digging, and simultaneous press-fitting of sheet piles with steel pipes are performed.

Even when using such a short leader 12,
Either the height of the leader 12 exceeds the transportation limit, or the reader 12 cannot be tilted backwards and placed in a horizontal position. The problem was that it took time and effort.

The present invention was made in view of these problems, and
In a pile driver equipped with a lifting device that uses chains and sprockets, the leader can be folded up and placed into a transportation position by itself without an auxiliary crane, reducing the time and effort required for setup during transportation and at the start of work. The purpose is to provide a pile driver that can save time.

(Means for Solving the Problems) In order to achieve this object, the present invention supports a front bracket provided at the front part of the pile driving machine body so as to be rotatable in the vertical direction by means of a hydraulic cylinder, and In a pile driving machine, a chain is stretched along the soda, and a working device having a drive sprocket that engages with the chain is attached to the leader so as to be able to move up and down, and a hydraulic cylinder for adjusting the chain tension is provided below the leader, The hinge end of the chain is connected to a hydraulic cylinder, and the leader can be divided into upper and lower parts using a dividing surface slightly above the joint between the soda and the front bracket, and the upper leader can be bent backward relative to the lower leader. A locking device is provided which connects the two halves of the chain and unbendably connects the two halves, and the tension adjustment hydraulic cylinder has a stroke that loosens the chain until the upper leader is in a nearly horizontal position. It is characterized by being set to

(Function) Since the present invention has the above-described structure, the lock device that prevents the upper leader from bending backward is unlocked, and the hydraulic cylinder between the front bracket and the pile driver body is actuated. This causes the front bracket to be pushed up, thereby tilting the leader backward. As a result, the center of gravity of the upper leader, including the working equipment, is moved to the rear of the pivot joint that connects the upper and lower leaders, and in this state, the hydraulic cylinder for adjusting the chain tension is operated in the direction of loosening the chain. As the chain moves, the upper leader bends around the pivot point due to its own weight and assumes a horizontal position.

(Embodiment) FIG. 1 is a side view showing an embodiment of a pile driver according to the present invention.
FIG. 2 is a side view showing a part of the embodiment with the upper leader bent, and the guide of the working device is not shown. In the present invention, the cylindrical leader 12A has a dividing surface 17 that is slightly above the joint between the leader 12A and the front bracket 3, that is, the joint between the arm 5 and the pin 9, and the lower leader 12a and the upper part. It is divided into a reader 12b. And the upper and lower leaders 12b
, bracket 1 on the back side of the butt part of 12a.
8.19 and insert the pivot pins 20 into these pin holes to connect the lower leader 12a to the upper leader 12b? :
Connects so that it can be bent backwards. In addition, the upper leader 12
A locking bracket 22 having a pin hole is provided at the lower end of the lower leader 12a to protrude downward.
A bracket 23 having a pin hole corresponding to the bracket 22 is provided, and as shown in FIG. By aligning the holes and inserting the lock bins 24 into the bin holes of these brackets 22 and 23, the upper leader 12b is attached to the lower leader 12.
locked to a.

Reference numeral 26 denotes a hydraulic cylinder for adjusting the chain tension, which is built into the lower leader 12b, and is connected to the chain 14.
The lower end of the chain 14 is connected to the guide sprocket 27 attached to the lower end of the lower leader 12a, the lower end of the chain 14 is connected to the piston rod of the hydraulic cylinder 26, and the upper end of the chain 14 is connected to the top of the upper leader 12b. do.

Therefore, when the hydraulic cylinder 26 is contracted, the chain 14 is tightened, and when the hydraulic cylinder 26 is extended, the chain 14 is loosened. The hydraulic cylinder 26 is simply a chain 14
The stroke required to adjust the tension of the
~Have Rourke. 28 and 29 are the lower leader 1 respectively.
This is a semicircular chain guide provided at the upper end of the upper leader 2a and the lower end of the upper leader 12b. Upper and lower leaders 12a, 12
The coupling device 13 of b has a structure in which a pin 32 is inserted into a pin hole of a bracket 30, 31 which is provided so as to be fitted so as to project toward the other side from both of the brackets.

When transporting this pile driver, the lock pin 24 is removed, and the hydraulic cylinder 2 that rotates the front bracket 3 is extended to tilt the entire leader 12A backward, as shown in FIG. The center of gravity of the upper leader 12b including 7 is located behind the pivot bin 20. Next, the hydraulic cylinder 26 for adjusting the weight of the chain 14 is gradually extended to loosen the tension on the chain 14. Then chain 1
4 is connected to the top of the L section leader 12b, the upper leader 12b is not supported by the chain 14, and therefore pivots around the pivot pin 20 due to its own weight, as shown in FIG.
As shown in the drawing, it begins to bend counterclockwise. By further extending the hydraulic cylinder 26, the upper leader 12
Put b into the water position and fold the F part waterer 12b. Furthermore, by contracting the hydraulic cylinder 2, the front bracket 3 is rotated clockwise, lowering the height of the leader 12A, and setting it in the transportation position. In addition, in the transportation posture,
whether part of the upper reader 12b is iut on the main body l;
Or J! on an appropriate table! It is preferable to put

When starting work after transportation, reverse the above procedure.

The hydraulic cylinder 26 is contracted to raise the top leader 12b, and the separation surface 1 between the upper leader 12b and the lower leader 12a is
7 and insert the lock pin 24 into the pin hole of the flaket 22 and 23 to lock it. And hydraulic cylinder 2
The soda 12A is placed in a vertical position by adjusting the amount of expansion and contraction, and the work is carried out.

In addition, when using a long soda 4, as shown in FIG. 6, connect the leader 4 to the arm 5 of the front bracket 3 and install the backstay cylinder 6 between the support point 11 and the leader 4. do the work.

(Effects of the Invention) According to the present invention, a chain used for raising and lowering a working device and a hydraulic cylinder for adjusting the tension of the chain are used, and the upper leader is folded backward while loosening the chain with the hydraulic cylinder. The leader can be folded and transported with its own blade without the need for an auxiliary crane, reducing the effort and time required for setup during transport and at the start of work. In addition, the present invention allows the chain and its tension adjustment hydraulic cylinder to be used for tasks other than their original purpose, and is inexpensive and does not require major changes to the structure of the device provided in the short leader. It has the advantage of being able to be implemented.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the pile driving machine of the present invention, Fig. 2 is a side view showing an embodiment of the pile driver of the present invention;
The figure is a side view showing a part of the embodiment with the upper leader folded down, Figures 3 to 5 are side views showing the soda folding process of the pile driver of this embodiment, and Figure 6 is a side view showing a part of the embodiment with the upper leader folded down. Figure 7 is a side view showing the conventional pile driver using a long leader, Figure 7 is a side view showing the pile driver shown in Figure 6 in a transportation position, Figure 8 is a side view showing a pile driver using a short soda. It is.

Claims (1)

[Claims] The leader is supported by a front bracket that is installed at the front of the pile driver so that it can be rotated vertically using a hydraulic cylinder.
A pile driver in which a chain is stretched along the leader, and a working device having a drive sprocket that engages with the chain is attached so as to be movable up and down along the leader, and a hydraulic cylinder for adjusting the chain tension is provided below the leader,
The lower end of the chain is connected to the hydraulic cylinder, and the leader is divided into lower parts using a parting surface slightly above the joint between the leader and the front bracket, and the upper leader is bent backward relative to the lower leader. A locking device is provided that connects the upper and lower leaders in an unbendable manner, and the tension adjustment hydraulic cylinder has a stroke length that can loosen the chain until the upper leader is in a substantially horizontal position. A pile driver characterized by the following settings.