JPH0211692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for safely and safely retracting a front attachment of a pile driver.

When driving piles with a pile driver, there are many methods in which an earth auger, casing, and screw are attached to the leader, and the pile hole is dug before driving, in order to avoid noise problems or improve the accuracy of the pile being driven. It has been adopted.

However, when a pile driver equipped with this type of front attachment is transported on a trailer or the like, it is necessary to transport the leader while lying on the pile driver body. For this reason, there is a method of dividing the leader and connecting it so that it can be bent, shortening the stay, and collapsing the standing main part of the leader to make it more compact and transportable. In order to maintain these front attachments, it is necessary to remove them from the reader, and this disassembly and reassembly work is both dangerous and time-consuming. The cost of transporting by truck, etc. increases, and improvements have been desired.

Therefore, the present invention solves the above-mentioned problems, and the casing attached to the earth auger drive device attached to the leader is held by a gripping part at the tip of an arm that is rotatably attached to the leader when the leader stands up. In this state, separate the casing and screw from the earth auger drive device, rotate the arm to the side of the leader, move the casing and screw to the side of the leader, store and fix them, and lower the earth auger drive device. To provide a storage method and device in which the casing and screw are stored and fixed at the bottom of the leader, and the stay is shortened while the casing and screw are held on the side of the leader main part, and the main part of the leader is brought down to a transporting position. It is designed so that the work can be done in a short time and with less danger.

An embodiment shown in the drawings will be described below. Fig. 1 is a front view of a pile driver equipped with the device of the present invention with the leader in an upright position, Fig. 2 is a front view of the pile driver in a transporting position, and Fig. 3 is a front view of the storage device. 4 is a plan view thereof, FIG. 5 is a front view of a stopper for fixing the storage device to the guide pipe, and FIG. 6 is a plan view thereof.

The pile driver main body 1 includes a lower traveling body 2, an upper rotating body 3,
It is composed of a leader 4, a stay 5, etc.

The leader 4 is divided into three parts at the top and bottom, and consists of a long leader main part 4a, a short leader upper part 4b and a leader lower part 4c provided at both ends of the leader main part 4a, a leader upper part 4b, and a leader main part 4a. The lower part 4c of the leader is pivotably supported by pins 6 and 7, respectively, and is configured to be bendable. A leader bending device 8 is provided between the leader main part 4a and the leader upper part 4b and between the leader main part 4a and the leader lower part 4c, respectively.

On the front side of the leader 4, guide pipes 9 are provided at the main part 4a, the upper part 4b, and the lower part 4c of the leader, respectively.
is fixed, an earth auger drive device 10 is slidably attached to the pipe 9, and a wire rope 13 is wound around the winding winch 12 of the upper revolving structure 3 via the top sheep 11 at the upper end of the leader upper part 4b.
It is suspended by a rope 13 and moved up and down by winding and unwinding the rope 13. This earth auger drive device 10
A casing 14 and a screw 15 are attached to the casing 14 and screw 15.

Another guide pipe 1 is provided on the side of the leader main part 4a.
6 is fixedly installed, and two storage devices 17 are slidably provided. This storage device 17 has a guide gib 18 that can be slidably attached to the guide pipe 16.
an arm 21 rotatably provided on the bracket 19 by a pin 20; a hydraulic cylinder 23 pivotally supported on the bracket 19 by a pin 22; and a tip of a piston rod 24 of the cylinder 23. pin 2 that pivots to arm 21
5 and a gripping portion 26 provided at the tip of the arm 21
It is composed of. The gripping part 26 is the gripping metal 2
7, a pin 28 and a bolt 29, and has a cylindrical shape that matches the shape of the casing 14, one end of the grip 27 is pivoted to the tip of the arm 21 with a pin 28 so that it can be opened and closed freely, and the other end is connected to the bolt 29. arm 2
1, the casing 14 can be held.

The stopper 30 includes a pair of cylinders 32 having a clamping part 31 that clamps the guide pipe 16, a bolt 33 that passes through both fixing metals 32, 32, a spring washer 34 that is inserted into the bolt 33, and a spring washer 34 that is screwed into the bolt 33. The storage device 17 is fixed to the guide pipe 16 by fastening the bolt 33 and the nut 35 so as to restrict the vertical movement of the storage device 17 disposed at predetermined positions above and below the guide pipe 16. ing.

Next, earth auger drive device 1 using this device
0, a method of storing the front attachment of the casing 14 and screw 15 will be explained.

First, with the leader 4 standing up as shown in FIG. 1, the two storage devices 17, 17 are slid onto the guide pipe 16 and placed at desired positions above and below as shown in FIG. . This height is the device 1
It is desirable that the positions 7 and 17 are such that the casing 14 can be held equally.

In order to restrict the vertical movement of the storage device 17, four stoppers 30 are fastened and fixed to the guide pipe 16 with bolts 33 and nuts 35 so as to be located above and below the bracket 19, as shown in FIG.

Next, the grip 27 at the tip of the arm 21 is opened, the piston rod 24 of the hydraulic cylinder 23 is extended until the grip 26 comes into contact with the casing 14, and the grip 27 is closed to hold the casing 14 and bolt. The grip 27 is tightened at 29 to fix and hold the casing 14 on the arm 21, and then the earth auger drive device 10, the casing 14, and the screw 15 are separated from each other. At this time, the screw 15 is fixed to the casing 14 by a fixing device (not shown) to prevent it from falling. When the piston rod 24 of the hydraulic cylinder 23 is shortened, the arm 21 rotates about the pin 20 from the front side of the leader 4 to the side (from the solid line position to the chain line position in FIG. 4) while holding the casing 14 and screw 15. do.

Next, loosen the wire rope 13 and lower the earth auger drive device 10 to the lower part of the leader 4c, and then tighten the stopper 30 to the guide pipe 9 of the lower part of the leader 4c so as to stop the earth auger drive device 10 from moving up and down. . Then, the wire rope 13 is removed from the earth auger drive device 10 and the stay 5 is shortened. At the same time, by operating the bending device 8, the connecting portion between the leader lower part 4c and the leader main part 4a and the connecting part between the leader main part 4a and the leader upper part 4b are It is bent at the connecting part, and as shown in FIG. 2, the leader main part 4a is in a substantially horizontal state, the leader upper part 4b and the leader lower part 4c are in a state hanging down from both ends of the leader main part 4a, and the casing 14 and screw 15 are bent. is the reader main part 4
The earth auger drive device 1 can be held at approximately the same height as the earth auger drive device 1, allowing a compact transportation posture.
0 is fixed to the lower part 4c of the leader.

The above has described the method of retracting the front attachment and placing the reader in the carrying position, but as for the assembly method, it is sufficient to perform the reverse procedure of the above method.

Note that the means for rotating the arm 21 is not limited to the hydraulic cylinder 23 described above, and other means may be used. Further, in the above embodiment, the reader 4 is divided into three parts, but it is possible to divide the reader into two or more parts.

As described above, the present invention allows the earth auger drive device to be held at the bottom of the leader, and the casing and screw to the sides of the main part of the leader.
The leader can be erected or moved into a transporting position safely and quickly, and the front attachment can be transported while being held in the pile driver, reducing costs.Furthermore, the front attachment can be inspected and repaired. This invention has many advantages in that it makes it easy to use.

[Brief explanation of drawings]

The figures show one embodiment of the present invention. Figure 1 is a front view of the pile driver when the leader is standing up, Figure 2 is a front view of the pile driver in the transporting position, and Figure 3 is a front view of the pile driver when the leader is in the upright position. 4 is a front view, FIG. 5 is a front view of the stopper, and FIG. 6 is a plan view thereof. 4 is a leader including a leader main part 4a, a leader upper part 4b, and a leader lower part 4c; 5 is a stay; 8 is a bending device; 9 is a guide pipe; 10 is an earth auger drive device; 13 is a wire rope; 14 is a casing; 15 is a screw, 16 is a guide pipe, 17
... storage device, 19... bracket, 21 is arm,
23 is a hydraulic cylinder, 26 is a gripping portion, and 30 is a stopper.

Claims (1)

[Scope of Claims] 1. In a method of folding down a leader in which a leader main part and a lower part of the leader are foldably connected to a transporting position, a casing attached to an earth auger drive device attached to the leader is When standing up, the arm rotatably attached to the leader is rotated and held by the gripping portion at the tip of the arm. In this state, the casing and screw are separated from the earth auger drive device, and the arm is attached to the side of the leader. The casing and screw are moved to the side of the leader and stored and fixed, the earth auger drive device is lowered and stored and fixed at the bottom of the leader, and the stay is shortened while the casing and screw are held on the side of the main body of the leader. A method for storing a front attachment of a pile driver, characterized in that the main part of the leader is folded down to take a transporting position. 2. A pile driver in which a leader in which a main part of the leader and a lower part of the leader are bendably connected is erected by a stay, and an earth auger drive device is movably provided in a guide pipe provided on the leader. A bracket is slidably provided on a guide pipe provided on the side of the leader separately from the pipe, and an arm is pivotally supported on the bracket, and a gripping portion for the casing is provided at the tip of the arm, and the casing is gripped by the gripping portion. A front attachment storage device for a pile driver, characterized in that a casing and screw can be held on the side of a leader by rotating an arm.