JP2001220744A - Pile driving guide tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile driving guide tube capable of surely and efficiently transmitting the striking force of a striking hammer to a pile and preventing damage to a guide tube body, thus eliminating the need for frequent repair work and permitting a safe operation causing little noise. SOLUTION: A hammer driving hole 1a provided in the top of the guide tube body and a pile head guide hole 1b provided in the bottom of the guide tube body are formed to vertically pass through the guide tube body and a locking recess 1c having a greater inside diameter than the hammer driving hole 1a and the pile head guide hole 1b is formed approximately intermediate between the holes. A beating plate 1d for transmitting the striking force from the striking hammer 3 is movably mounted in the locking recess 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driving machine for driving pillars of a retaining wall or the like in revetment work or the like, and in particular, a guide cylinder for pile driving used by being attached to a hammer of heavy equipment such as a hydraulic shovel. It is about.

[0002]

2. Description of the Related Art A pile hammer in a construction work of a pillar or the like is equipped with a hammer driven by a hydraulic supply operation at an arm tip of a heavy equipment such as a hydraulic excavator, and the hammer strikes a pile head. At this time, in order to improve the hitting accuracy, a metal guide tube that surrounds and guides the head of the pile is attached to the tip of the hammer, and driving is performed through this guide tube. For example, the conventional guide cylinder 11 shown in FIG. 4 has a hammer driving recess 12 into which a hammer is inserted, and a guide recess 13 into which the head of the pile is guided and surrounded.
Are defined only by a partition wall 14 integrally formed with the guide cylinder 11, and the upper surface of the partition wall 14 is a hammer striking surface 14a, and the lower surface is a pile striking surface 14b.

[0003]

However, in the above-described conventional guide cylinder, since the partition wall portion hit by a hammer is formed integrally with the guide cylinder main body, the entire guide cylinder receives an impact due to the impact of the hammer. I will receive it.
For this reason, there has been a problem that the impact force is dispersed and the impact force on the pile is reduced. In addition, since the entire guide cylinder vibrates, cracks are likely to occur on the welded surface, etc., which not only requires frequent repairs, but also has a loud noise, and there is the danger that broken pieces may fall off during work, which is safe. It was hard to say that it was preferable. The present invention
In view of the problems of the prior art as described above, the impact force of the impact hammer can be reliably and efficiently transmitted to the pile, preventing damage to the guide cylinder main body and not only eliminating frequent repairs. It is another object of the present invention to provide a pile driving guide cylinder that can operate safely with low noise.

[0004]

For this reason, according to the present invention, a head is mounted on a hammer driven by a hydraulic supply operation mounted on the tip of an arm of a hydraulic shovel or the like, and surrounds the head of a pile to be hit. A first feature of the pile driving guide cylinder to be guided is that, within the pile driving guide cylinder, a hitting plate that transmits a striking force from the striking hammer is movably provided on the top of the pile. .

A second feature is that a slit into which a flat plate can be fitted is provided at the lower end of the guide cylinder. By fitting the top of a flat plate such as a sheet pile into this slit, it is possible to drive even a flat plate while holding it stably.

A third feature is that a cap that can be fitted to a pile head to be hit is provided. The cap can prevent the pile head from being damaged by hitting.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the drawings. 1 is a perspective view showing a state in which a pile driving guide cylinder according to the present invention is attached to a hammer of a heavy machine, FIG. 2 is a schematic sectional view showing an example of a hammer, and FIG. FIG. 4B is a perspective view showing a pile driving guide cylinder, FIG. 4B is a longitudinal sectional view thereof, FIG. 4A is a perspective view showing a conventional pile driving guide cylinder, and FIG.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
Is a guide cylinder for pile driving attached to a hitting hammer 3 driven by a hydraulic supply operation at the tip of the rod.
f is suspended by a guide cylinder suspension hook 4a of a mounting bracket 4 described later via a ring 5a and a wire rope 5. The hydraulic excavator has an arm 2 that can be moved up and down, and a hitting hammer 3 is attached to the arm 2 so as to be able to swing up and down by being clamped by a mounting bracket 4 made of a pair of steel plates. The striking hammer 3 includes a hydraulic drive cylinder 3a and a striking piston 3b. The striking piston 3b moves up and down by supplying hydraulic pressure to the driving cylinder 3a, and a striking member provided below the striking piston 3b. The pile 6 is driven through the rod 3c.

As shown in FIG. 2, for example, the striking hammer 3 has a striking piston 3b slidably incorporated in a driving cylinder 3a having a square tubular shape, and hydraulic chambers A and B are formed above and below the striking piston 3b. The striking operation is performed by sliding the striking piston 3b up and down by supplying the hydraulic pressure to these two hydraulic chambers A and B at shifted timings. That is, the amount of hydraulic pressure supplied to the two hydraulic chambers A and B is controlled with the sliding of the striking piston 3b, so that the striking piston 3b can reciprocate. A hydraulic supply hose (not shown) extending from a hydraulic excavator is connected to the drive cylinder 3a, and a pile driving operation is performed by supplying hydraulic pressure from the hydraulic excavator.

The pile driving guide cylinder 1 of the present invention shown in FIG.
Hammer driving hole 1a provided in the upper part of the guide cylinder main body
And a pile head guide hole 1b provided in the lower part of the guide cylinder main body are formed vertically penetrating therethrough, and the inner diameter is made larger than the hammer driving hole 1a and the pile head guide hole 1b at a substantially middle portion thereof. A locking recess 1c is formed.
A hitting plate 1d for transmitting a striking force from the striking hammer 3 is movably mounted on the top of the pile 6 therein. Here, the guide cylinder itself is made of steel, and the hitting plate 1d is also made of steel. However, as a material of the hitting plate 1d, for example, a Herten steel material having toughness and high repulsion is preferable. That is, the pile driving guide cylinder 1 of the present invention has a locking step formed on the inner surface of the hammer driving recess as referred to in the prior art, and a pile head for fitting a pile head below the locking step. The guide recess is provided, and a partition wall provided in a conventional guide cylinder is eliminated. Further, a slit 1g into which a flat plate can be fitted is provided at the lower end of the guide cylinder main body. By fitting the top of a flat plate such as a sheet pile into the slit 1g, the flat plate can be stably held, It is possible to reliably hit even the top of a flat plate having a relatively narrow hitting area.

In the guide cylinder 1 for pile driving according to the present invention, the striking rod 3c of the driving cylinder 3a strikes only the striking plate 1d. For this reason, the impact which the guide cylinder main body itself receives by the impact of the impact hammer 3 decreases. Therefore, the impact force of the impact hammer 3 can be intensively transmitted to the pile 6 without dispersing. Further, since the vibration of the entire guide cylinder is extremely reduced, noise is also reduced, and the guide cylinder main body is hardly damaged, so that it is not necessary to frequently repair the guide cylinder. In addition, there is no danger of the broken pieces dropping during the operation, so that the auxiliary worker can work safely.

The striking hammer may be of any type capable of striking by supplying hydraulic pressure. Basically, a hydraulic chamber is formed before and after a striking piston in a cylinder, and the hydraulic pressure is supplied thereto at a shifted timing. And slide the striking piston back. In this case, the supply passage and the recirculation passage may be connected to the front and rear hydraulic chambers, respectively, and the hydraulic pressure may be alternately supplied by replacing the valve. For example, a system adopted in a hydraulic breaker, that is, an upper hydraulic chamber, It is also possible to adopt a system in which the amount of hydraulic pressure supplied to the piston is controlled to perform a return operation by the recoil of the striking piston.

The hitting plate 1d may simply hit the top of the pile 6 with its lower surface, but in order to perform a reliable hitting operation, the lower surface of the concave portion 1 can be fitted to the pile head 6a.
e or the like is preferably provided. Further, as shown in FIG.
A cap 7 fitted to the head 6a of the stake 6 may be provided, and the upper surface of the cap 7 may be formed to protrude in an arc shape, and the concave portion 1e of the striking plate 1d may be shaped to follow this arc shape. . By using such a cap 7, not only does the striking force not decrease even if the striking direction is slightly shifted, it is possible to prevent the pile head 6a from being damaged by striking. If a cushioning material such as a rubber 7a is attached to the inner surface of the cap 7, it will be more effective to prevent damage to wooden piles, concrete piles and the like.

Next, a pile driving operation using the pile driving guide cylinder of the present invention will be described. For example, in a retaining wall construction work for a revetment, a wooden pillar (pile) 6 fitted with a cap 7 is held in a state where the auxiliary worker stands upright on the ground, and in this state, a driver of the excavator operates the operating lever. By operating the arm 2, the swinging movement, the vertical movement of the arm 2 and the swinging movement of the mounting bracket 4 back and forth are performed appropriately, and the impact hammer 3 is installed immediately above the support (pile) 6. Next, when the pile head guide hole 1b of the pile driving guide cylinder 1 of the hammer 3 is fitted into the head of the column (pile) 6, and in that state, hydraulic pressure is supplied to the drive cylinder 3a to perform a striking operation. The striking force is applied to the strut (pile) 6 via the striking plate 1d.
Transmitted to the ground. When the strut (pile) 6 is driven to a depth at which the striking force cannot be transmitted, the arm 2 and the mounting bracket 4 are operated (downward) to lower the striking hammer 3 by a predetermined distance, and the striking operation is performed again. The column (pile) 6 is driven to a desired depth by repeating a series of operations.

[0015]

As described above, according to the present invention, the impact force of the impact hammer can be reliably and efficiently transmitted to the pile, preventing damage to the guide cylinder and eliminating frequent repairs. In addition, it has an excellent effect that the work can be performed safely with low noise.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a pile driving guide cylinder according to the present invention is attached to a hammer of a heavy equipment.

FIG. 2 is a schematic sectional view showing an example of a hammer.

FIG. 3A is a perspective view showing a pile driving guide cylinder according to the present invention, and FIG. 3B is a longitudinal sectional view thereof.

FIG. 4 (a) is a perspective view showing a conventional pile driving guide cylinder,
(B) is a longitudinal sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 pile driving guide cylinder 1a hammer driving hole 1b pile head guide hole 1c locking depression 1d striking plate 1e depression of striking plate 1f ear piece 1g slit for flat plate fitting 2 hydraulic excavator arm 3 striking hammer 3a drive cylinder 3b striking piston 3c striking rod 4 mounting bracket 4a guide tube lifting hook 5 wire rope 5a ring 6 post (pile) 7 cap 7a rubber (buffer material)

Claims (3)

[Claims] 1. A pile driving guide cylinder, which is attached to a hammer driven by a hydraulic supply operation attached to a tip of an arm of a hydraulic excavator or the like and surrounds and guides a head of a pile to be hit. A pile driving guide cylinder, wherein a striking plate for transmitting a striking force from the striking hammer is movably provided at the top of the pile in the pile driving guide cylinder. 2. The guide cylinder for pile driving according to claim 1, wherein a slit into which a flat plate can be fitted is provided at a lower end portion of the guide cylinder. 3. A pile driving guide cylinder according to claim 1, further comprising a cap which can be fitted to a head of the pile to be hit.