JPS5928698B2 - Leader device in pile driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a leader device for a pile driver, and in particular to a leader device for a pile driver that can easily and safely insert an auger screw into a hollow pile in a hollow excavation method. Regarding equipment.

The tunneling method is widely used as a construction method for driving foundation piles into the ground without noise or vibration.

In this method, a hollow pile is supported by a pile driver, and an auger screw inserted into the pile is used to excavate the ground and remove the soil while pressing the hollow pile into the pile.

Therefore, when implementing the above construction method, when setting the hollow pile and auger screw in the pile holding device and drive part of the pile driver before starting work, it is necessary to insert the auger screw into the hollow pile in advance on the ground. The method used is to fix the two together using a rope and then use a large crane to lift them. However, this method not only requires a large crane, but also requires extremely dangerous work, and also requires the use of hollow piles. There are various problems such as the need for a connecting means to connect the auger screw to the auger screw, and the disadvantage is that lifting work cannot be carried out particularly in a narrow space.

In view of this, the present invention allows hollow piles and auger screws to be hung separately, making the lifting work easier, and at the same time eliminating the need for special equipment. 9- of pile drivers that can perform the construction method
It was developed for the purpose of providing a data device.

The present invention will be described below with reference to embodiments shown in the drawings.

The leader mast 1 in the reader device of the present invention is composed of a lower mast 3 supported vertically on a working machine 2, and an upper mast 4 rotatably connected to the upper end of the lower mast 3. Guide rails 5 and 6 are attached to each front surface of the upper mast 4.

The rotation support means for the upper mast 4 includes a bearing 7 interposed between the upper end of the lower mast 3 and the lower end of the upper mast 4, as shown in an enlarged view in FIG. The upper part of the upper mast 4 is rotatably supported by a bearing member 9 at the upper end of the stay 8 whose base is supported by the working machine 2 .

The upper mast 4 is driven to rotate over a predetermined angle by a swing motor 10 installed inside the lower mast 3.

Note that the swing motor 10 may also be a hydraulic motor, a hydraulic cylinder, or the like.

The guide rail 5 of the lower mast 3 is equipped with a pile holding device 12 that supports the upper end of the hollow pile 11, and the guide rail 6 of the upper mast 4 is equipped with a drive unit 13 having a motor, a speed reducer, etc. , the pile holding device 12 and the drive section 1
3 are detachably connected to each other by a push-in cylinder 14.14.

This separation means may be performed by inserting and removing the pin 15 as usual.

The drive unit 13 is connected to sheaves 17 and 1 of a top sheave block 16 that is located at the upper end of the upper mast 4 and extends in the front-rear direction.
The wire rope 19 is suspended by a wire rope 19 wound around the work machine 2, and the wire rope 19 can be freely wound up and down by a winch 20 mounted on the work machine 2.

An auxiliary mast 21 is erected above the top sheave block 16 of the upper mast 4, and a sheave block 22 extending perpendicularly to the top sheave block 16 is provided at the upper end of the auxiliary mast 21.

The wire rope 25 wound around the sheaves 23 and 24 of the sheave block 22 is also connected to the winch 2 mounted on the working machine 2.
0 allows it to be rolled up and lowered freely.

26 indicates an auger screw.

Next, the operation of the above embodiment will be explained.

Prior to the start of the digging work, first, as shown in FIG. 1A, a wire rope 19 is hooked and suspended from the hollow pile 11, and the upper part thereof is attached to the pile holding device 12 in a vertical position.

Next, the auger screw 26 is lifted by the wire rope 25 of the auxiliary mast 21, while the push cylinders 14, 14 and the holding device 12 are separated, and the swing motor 10 is driven to move the upper mast 4 as shown in FIG. 1B. like 90°
Swirl.

By doing this, the sheave block 2 of the auxiliary mast 21
The second sheave 23 swings to a position directly above the hollow pile 11, and the drive unit 13 retreats from the upper end position of the hollow pile 11.

If you lower the auger screw 26 in this way, the hollow pile 1
It can be inserted within 1.

After insertion, the upper mast 4 is rotated back to its original position, the pushing cylinder 14 and the pile holding device 12 are connected, and the upper end of the auger screw 26 is connected to the output shaft at the lower end of the drive section 13. Complete the preparations (Figure 1C)
.

In this way, the leader device of the present invention divides the leader mast into two halves, connects the upper mast to the lower mast so as to be rotatable, and connects the leader mast to the lower mast so as to be rotatably driven. An auxiliary mast is erected, and a sheave block extending perpendicularly to the top sheave is installed at the upper end of the auxiliary mast, and the drive unit is used for lifting the piles and auger screws on the upper mast, and the pile is held on the lower mast. Since the device is configured to be attached to each device, the hollow pile is suspended and held in a predetermined position, and then the geo-gas creue is hoisted by the auxiliary mast and the upper mast is rotated, so that the drive unit automatically releases the auger from the top of the hollow pile. Move to a position where it will not interfere with the insertion of the creue, and at that time the sheave of the auxiliary mast will be located just above the hollow pile, and by lowering the auger creue, it will be possible to insert it into the hollow pile. Therefore, it has excellent workability, and since there is no need to suspend the hollow pile and auger screw together, there is no need to use a large crane (and work preparations can be made even in a narrow space.

Furthermore, since the auger screw can be inserted while the hollow pile is suspended and held in a predetermined position, there is no need to move the hanging position of the hollow pile, which eliminates the need for costly equipment. effective.

[Brief explanation of the drawing]

Figures 1A to 1C show the operating states of the leader device according to the present invention. Figure 1A shows the hollow pile suspended, and Figure 1B shows the auger screw with the upper mast turned. Figure 1C is a side view showing the state in which the auger screw has been inserted and the upper mast has been returned, Figure 2 is an enlarged sectional view of the connection between the upper and lower masts, FIG. 3 is a top view of the device. 1... Leader mast, 2... Working machine, 3... Lower mud, 4... Upper mast, 5, 6... Guide rail, 7... Bearing, 8... Stay, 9 ...Bearing member, 10...Swivel motor, 11...Hollow pile,
12... Holding device, 13... Drive unit, 14... Pushing cylinder, 16... Top sheave block, 17
, 18, 23° 24... sheave, 19, 25... wire rope, 21... auxiliary mast, 26... auger screw.

Claims (1)

[Claims] 1 The leader mast is divided into two: an upper mast to which the drive unit is attached during the work of lifting piles and auger screws, and a lower mast to which the pile holding device is attached, and the upper mast is connected to the lower mast so that it can be driven one rotation. A leader device for a pile driver, comprising a top sheave block provided at the upper end of an upper mast, an auxiliary mast erected, and a sheave block provided at the upper end of the auxiliary mast in a direction orthogonal to the top sheave block.