JPS6136577Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a pile driver used for driving hollow cylindrical piles such as steel pipe piles.

Prior Art Hollow cylindrical steel pipe piles have been widely used as foundations of buildings, and various pile drivers have been proposed for driving these steel pipe piles.

However, all of these methods require a dowel to support a pile driver or the like, which requires time and effort to install and remove the dowel on site.

Furthermore, there is no effective means for preventing noise during pile driving, and it has not been possible to prevent loss of driving energy due to rebound of the weight.

Purpose of the invention Therefore, the purpose of the present invention is to improve the shortcomings of the conventional pile driver as described above, to improve workability on site without the need for towers, etc., and to effectively reduce noise during hammering, and to To provide a pile driver which can also prevent the rebound of a weight.

Structure of the invention The present invention includes a hoisting part placed on the upper end of a pile, a first electromagnet that can be moved up and down in the longitudinal direction from the hoisting part inside the pile, and a weight that is detachable from the bottom of the first electromagnet. and a second electromagnet that is disposed at the inner bottom of the pile and is energized only when the weight falls, and the second electromagnet attracts the weight during driving and prevents the weight from rebounding. shall be.

Embodiments Hereinafter, explanations will be given based on embodiments of the present invention shown in the drawings.

The pile driver according to the present invention includes a hoisting part 2 placed on the upper end of a pile 1, a first electromagnet 11 supported by a wire 7 so as to be movable vertically within the pile 1 from this hoisting part 2, It is composed of a weight 12 that is attracted by energizing the first electromagnet 11, and a second electromagnet 13 that is placed at the inner bottom of the pile 1.

The winding part 2 includes a metal case 15 having a width larger than the diameter of the pile 1, and a vibration-proofing rubber 14 that covers the contact area between the case 15 and the pile 1. An upper motor 3 is provided.

A take-up pulley 5 is attached to the hoist motor 3,
A plurality of wires 7, 7 are wound together by a pulley 4 attached to the upper bottom wall of the case 15. The control unit 6 includes a hoisting motor 3, a first motor, which will be described later.
The second electromagnets 11 and 13 are energized to control the limit and
Input signals from switches 8 and 9.

In addition, a limit switch 8 is provided in a portion of the lower bottom wall of the case 15 located inside the pile 1, and when the first electromagnet 11 that attracts the weight 12 reaches the top dead center, the limit switch 8 is activated. It turns on and outputs a signal to the control section 6.

The bottom of the pile 1 is filled with sand, etc., and the second
The second electromagnet 13 is disposed.
Numeral 3 has a weight approximately equal to that of weight 12, and a guide pole 10 is formed upright in the center thereof, extending in the longitudinal direction of pile 1 to above the top dead center of first electromagnet 11.

The first electromagnet 11 is supported by a plurality of wires 7, 7 from the pulley 4 of the winding part 2, and the first electromagnet 11
A guide hole 16 formed in the center passes through the guide pole 10. For this reason, the first electromagnet 1
1 is capable of moving up and down within the pile 1 by winding up and down the wires 7, 7 of a hoisting motor 3 along a guide pole 10. Further, a recess is formed in the bottom of the first electromagnet 11, and the recess is turned off when the detector protrudes from the bottom, and turned on when the detector is biased to be stored in the recess. A limit switch 9 is installed. That is, the limit switch 9 detects that the first electromagnet 11 has descended and reached the upper surface of the weight 12 after falling.

Like the first electromagnet 11, the weight 12 has a guide hole 17 formed in its center and is inserted through the guide pole 10.

The guide holes 16 and 17 are preferably treated with Teflon, and the guide holes 10 and 17 are preferably treated with Teflon.
must be made of non-magnetic material.

Function When using this pile driver, position the pile 1 in advance and pour a predetermined amount of sand into the bottom. A second electromagnet is placed inside the pile 1, and a weight is inserted through the guide pole 10 to place it inside the pile 1. Next, the first electromagnet 11
while inserting the winding part 2 into the guide pole 10.
Place it on the top end.

Therefore, when the control section 6 is operated, the hoisting motor 3
is operated to let out the wires 7, 7 from the take-up pulley 5, and lower the first electromagnet 11 located at the top dead center along the guide pole 10. Second electromagnet 13
When the first electromagnet 11 reaches the upper weight 12, the limit switch 9 is activated.

Therefore, the control unit 6 energizes the first electromagnet 11 to attract the weight 12, and operates the hoisting motor 3 to hoist the wires 7, 7, thereby attaching the weight 12 and the first electromagnet 11.
to rise.

When the first electromagnet 11 reaches the top dead center, the limit switch 8 is activated. Therefore, the control unit 6 stops the hoisting motor 3, stops energizing the first electromagnet 11, drops the weight 12, and moves the second electromagnet 13.
Drive the pile 1 by hitting . Here, the control unit 6 stops energizing the first electromagnet 11 and simultaneously stops the second electromagnet 11.
The electromagnet 13 is energized for a predetermined period of time.

That is, while the weight 12 is falling or being struck, the second electromagnet 13 is appropriately energized and excited to attract the weight 12 and prevent rebound.

Thereafter, this stroke is repeated to drive the pile.

The first and second electromagnets 11 and 13 are energized by the control unit 6 in an appropriate manner, and the second electromagnet 11 in the pile 1
The arrangement and removal are performed by lifting the upper end of the guide pole 10 with a crane or the like.

Effects of the invention The embodiment of the pile driver according to the invention is as described above, and the following effects can be achieved.

Since the entire weight of the pile driver is loaded on the pile, there is no need for a tower, reaction force is also applied to the pile, and the rebound of the weight is prevented, allowing effective use of impact energy.

Furthermore, since the impact is performed within the shielded pile, noise generation during impact can be reduced.

[Brief explanation of the drawing]

The drawing is a partially cutaway front view showing an embodiment of the pile driver of the present invention. 1...Pile, 2...Hoisting part, 3...Hoisting motor,
4... Pulley, 5... Take-up pulley, 6... Control unit,
7...Wire, 8,9...Limit switch, 1
0... Guide pole, 11... First electromagnet, 12
... Weight, 13 ... Second electromagnet, 14 ... Rubber plate, 15 ... Case, 16, 17 ... Guide hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A pile driver for hollow cylindrical piles, comprising: a hoisting part placed on the upper end of the pile; and a nozzle supported so as to be movable up and down in the longitudinal direction from the hoisting part inside the pile. A second electromagnet, a weight that can be attached to and removed from the bottom of the electromagnet by controlling the energization of the electromagnet, and a second electromagnet that is arranged at the bottom of the pile and configured to be energized only when the weight falls. A pile driver that is characterized by: