JPH0619627Y2 - Pile driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a driving tool for foundation piles such as ready-made piles.

(Prior Art) In a conventional driving type pile driving machine, a pile is made to stand upright along a main leader, and a pile support cap mounted to the main leader so as to be vertically movable is fitted to the head of the pile, Next, a drop hammer, which is mounted on the main leader so as to be able to move up and down, is dropped to hit the cap, and the pile is driven into the ground.

(Problems to be Solved by the Invention) In the above-mentioned conventional driving type pile driving machine, the impact when the pile supporting cap is hit with a drop hammer is absorbed by the cap descending along the main leader. However, since the impact is not sufficiently absorbed, repeated impacts may act on the main leader, the cap suspension device, etc., causing them to be fatigued or broken.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a pile driving machine in which an impact at the time of driving a pile does not act on devices such as a main leader and a cap suspension device.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention is configured such that a long sub-leader 4 is attached to a long main leader 2 in a vertically movable manner, and
A pile support cap 8 for supporting the heads of the piles 7 is mounted on the sub-leader 4 so as to be able to move up and down, and cap suspension devices 13, 39 for suspending and supporting the cap 8 via the sub-leader 4 are provided. A drop hammer 19 for hitting the cap 8 is mounted on the main leader 2 so as to be vertically movable.

(Embodiment) FIG. 1 is a side view of a pile driver as an embodiment of the present invention, in which a guide rod 3 of a long main leader 2 supported by a crane body 1 in an upright state has a short sub leader. 4 is the engaging arm 5
A pile support cap 8 for fitting and supporting the head of the pile 7 is mounted on the guide rod 6 of the sub-leader 4 via the engaging arm 9 so as to be able to move up and down. Stoppers 10 and 11 for restricting the movement stroke of the cap are fixed to the upper and lower ends of the sub-leader 4.
Therefore, the cap 8 is mounted on the sub-leader 4 in a state of being free to move up and down within a certain range, and is further mounted on the main leader 2 via the sub-leader 4 so as to be vertically movable over its entire length.

The main reader 2 is provided with a cap suspension device 13. This device 13 is wound between a pair of sprocket wheels 14 and 15 arranged at the upper and lower ends of the main leader 2 and the sprocket wheels 14 and 15, and a predetermined chain link 16a is provided on the auxiliary leader 4. Endless chain 16 connected to
And a drive device 17 for reciprocating the chain 16 via the lower sprocket wheel 15. By operating the cap suspension device 13 in one direction and pulling up the sub leader 4, the lower stopper 11 is moved. The cap 8 can be raised by being regulated.

On the guide rod 3 of the main leader 2, a drop hammer 19 for hitting the cap 8 is supported by an engaging arm 18 so as to be lifted and lowered, and a locking tool 20 projecting from the side surface thereof is provided with a crane. The tip of the lifting rope 22 pulled out from the driving winch 21 of the main body 1 has sheaves 23, 23 on the main leader 2.
And, it is detachably locked via sheaves 24, 24 on the drop hammer 19. Therefore, the operation of the winch 21 causes the drop hammer 19 to rise and fall, and the cap 8
The pile 7 supported by the cap 8 is driven into the ground.

In this case, since the cap 8 is attached to the sub-leader 4 in a vertically movable state within a certain range, the cap suspension which is directly connected to the main leader 2 and the crane main body 1 supporting the main leader 2, especially the sub-leader 4 is mounted. The device 13 is not given an impact force that may damage the device.

Reference numeral 26 in FIG. 2 denotes a pile fixing pin fitted in the through hole 27 of the cap 8.

When performing a pile driving operation, as shown in the phantom line in FIG. 1, the lifting rope 22 is removed from the locking tool 20 of the drop hammer 19 and fed out. At this time, the drop hammer 19 is placed on the upper surface of the cap 8 supported by the sub leader 4, and does not drop even if the lifting rope 22 is removed. This point is one of the features of the present invention. The tip of the lifting rope 22 is engaged with the pile 7 on the ground, and then the lifting rope 22
The pile 7 is caused by winding up. Next, the heads of the piles 7 that have been raised are fitted into the caps 8 and the piles 7
And the pile 7 as shown in the solid line in FIG.
Then, the lifting rope 22 is detached from the pile 7 at the tip end thereof, and then the lifting rope 22 is locked to the locking tool 20. Next, the winch 21 is actuated to repeatedly drop the drop hammer 19 onto the cap 8, and in parallel with this, the cap suspension device 13 is actuated to lower the sub-leader 4.
It is possible to efficiently perform the hammering action while preventing the impact of the drop hammer 19 from acting on 13 as much as possible. Note that the chain of the cap suspension device 13 may be disengaged so that the chain 16 can rotate freely.

Another embodiment of the present invention will be described with reference to FIGS. 3 and 4. The same components as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. The cap suspension device 39 of this embodiment includes a winch 40 arranged on the crane body 1.
And the sheave of the main leader 2 fed from the winch 40.
And a suspension rope 42 connected to the sub-leader 4 via 41, 41. The suspension rope 42 is operated by operating the winch 40 for suspension.
By winding 42, the cap 8 can be pulled up.

The stakeout procedure of this embodiment is almost the same as that of the above-mentioned embodiment, and the description thereof will be omitted.

(Effect of the Invention) According to the present invention, since the pile support cap can be raised and lowered with respect to the sub-leader and the sub-leader with respect to the main leader, respectively, the impact force by the drop hammer can be as high as possible. It is possible to prevent the leader, the cap suspension device, and the like from being affected, which prevents damage to the device and allows a smooth driving operation.

Particularly, according to the present invention, when the hoisting rope for hanging the drop hammer is removed and the rope is used for hoisting the pile, the drop hammer is mounted and supported on the pile supporting cap supported by the sub leader. Since it does not fall, it can be used both as a drop hammer hoisting / falling rope and a pile hoisting rope, and since only one winch is required to operate the rope, the structure is simple and easy to operate. Is.

[Brief description of drawings]

FIG. 1 is a side view of a pile driver which is an embodiment of the present invention, FIG. 2 is an exploded perspective view of the main portion thereof, and FIG. 3 is a side view of a pile driver which is another embodiment of the present invention. FIG. 4 is an exploded perspective view of the main part. 2 ... Main leader, 4 ... Sub leader, 7 ... Pile, 8 ... Cap, 13,39 ... Cap suspension device, 19 ... Drop hammer.

Claims (1)

[Scope of utility model registration request] 1. A long sub-leader is attached to a long main leader so that the sub-leader can be moved up and down, and a pile support cap for supporting a head of a pile is attached to the sub-leader so that the sub-leader can be moved up and down. A pile driving machine, in which a cap suspension device that suspends and supports the cap is provided via the cap, and a drop hammer that strikes the cap is mounted on the main leader in a vertically movable manner.