JPH0751786B2 - Press-fit type pile driver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting type pile driving machine, and more particularly to a press-fitting type pile driving machine capable of driving a predetermined driven pile to press it into the ground through the pressing force of a hydraulic cylinder.

[0002]

2. Description of the Related Art Conventionally, as a press-fitting type pile driver of this type,
For example, as shown in FIG. 2, a chuck device 12 capable of gripping a driving pile 13 such as a steel sheet pile is attached to a hydraulic cylinder 2 provided in a pile driving machine main body 15 which is erected via a column body 16. There are those which are vertically movable via the hydraulic cylinder 2.

That is, the press-fitting type pile driver having the above structure is
The pile 14 such as a steel sheet pile gripped by the chuck device 12 is lowered (arrow E) via the pressing force (arrow D) of the hydraulic cylinder 2 on which the chuck device 12 is mounted.
Since the driving pile 13 can be pressed into the ground 14 by a static load through the hydraulic cylinder 2, there is no noise pollution at the time of driving. Therefore, it is most suitable for driving in piles such as densely packed houses where the existing hammer pile driving machine (not shown) and vibration pile driving machine (not shown) cannot be used.

[0004]

However, the press-fitting type pile driver having the above-mentioned structure has the following problems.

That is, the press-fitting type pile driver having the above structure is
A driving pile such as a steel sheet pile held by a chuck device is lowered (arrow E) via a pressing force (arrow D) of a hydraulic cylinder on which the chuck device is mounted and press-fitted into the ground.

The driving pile such as a steel sheet pile held by the chuck device as described above is lowered (arrow E) via the pressing force (arrow D) of the hydraulic cylinder on which the chuck device is mounted.
In the case of press-fitting into the ground, there is also a ground layer in which the upper layer of the ground is the soft ground 14a and the lower layer is the hard ground 14b.

Therefore, when the ground into which the driving piles are press-fitted is the ground formed by the soft ground on the upper layer and the hard ground on the lower layer, the steel sheet pile or the like is exerted by the pressing force of the hydraulic cylinder. It was not possible to drive the driving pile into the lower hard ground to press it, and also from the viewpoint of noise pollution countermeasures, the driving pile that was once pressed in was hammer hammer driving machine (not shown) or vibration pile driving machine ( There was a very serious problem that it could not be driven in via (not shown).

However, the present invention solves the above-mentioned problems. Even if the ground into which the driving piles are press-fitted is a stratum formed of hard ground, noise pollution is not generated at all. It is an object of the present invention to provide an extremely excellent press-fitting pile driving machine that can drive a driving pile such as a steel sheet pile into a hard ground only by pressing the hydraulic cylinder.

[0009]

SUMMARY OF THE INVENTION That is, the present invention provides a press-fitting type pile driving machine configured to drive a predetermined driving pile into the ground by pressing force of a hydraulic cylinder. When the driving pile is driven through the hydraulic cylinder, the driving machine main body generates hydraulic shock in the oil pipeline of the hydraulic cylinder so that the hydraulic oil having a pressure higher than that of the hydraulic source is supplied to the hydraulic cylinder. The point is that a hydraulic pressure booster for feeding and boosting pressure is provided.

[0010]

In the press-fitting pile driving machine having the above structure, when the driving pile is driven through the hydraulic cylinder, an oil hammer is generated in the oil pipeline of the hydraulic cylinder so that the pressure is higher than that of the hydraulic power source. Since the hydraulic pressure booster for feeding the hydraulic oil that has become to the hydraulic cylinder to increase the pressure is provided, even when the press-fitting of the driving pile through the hydraulic cylinder is blocked by the hard ground. By pushing the hydraulic oil having a pressure higher than that of the hydraulic pressure source to the hydraulic cylinder via the oil hammer to increase the pressure, the pressing force of the hydraulic cylinder can be instantaneously increased.

Therefore, the pressing force of the hydraulic cylinder is instantaneously increased, so that an instantaneous volume change is caused in the hard ground through the driving pile held by the chuck device mounted on the hydraulic cylinder. After that, the driven pile can be easily press-fitted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a press-fitting type pile driver.

Reference numeral 2 denotes a hydraulic cylinder provided in the press-fitting type pile driving machine 1 and equipped with a chuck device 12 capable of gripping a driving pile 13 such as a steel sheet pile.

Reference numeral 2a designates a hydraulic pressure booster for feeding hydraulic oil having a pressure higher than that of a hydraulic pressure source to the hydraulic cylinder 2 to increase the pressure by generating an oil hammer in the oil pipe 3 of the hydraulic cylinder 2.

The hydraulic pressure booster 2a includes the oil pipe 3
An oil pump 4 which sends out a predetermined amount of oil to the oil pump 3 and a predetermined oil pipe 3 by closing the oil pipe 3 so as to instantaneously block the flow of hydraulic oil flowing through the oil pipe 3 at a high speed through the oil pump 4. Solenoid valve 6 that causes an oil hammer on the computer, a computer 7 that controls the opening and closing amount and / or the opening and closing time of the solenoid valve 6, and an oil hammer that is generated by closing the solenoid valve 6 causes a pressure higher than that of the hydraulic pressure source. And a check valve 5 for taking out only the hydraulic oil, and the computer 7 controls the opening / closing amount and / or the opening / closing time of the solenoid valve 6 by the pulse width sent to the solenoid valve 6, thereby generating an oil hammer. The amount of pressure increase afterward can be adjusted.

Reference numeral 8 denotes an accumulator which removes the pulsation of the hydraulic oil having a constant pressure generated through the oil pump 4 and sends the hydraulic oil from which the pulsation is removed to the oil pipe 3.

Reference numeral 9 designates a manually operated valve for operating the hydraulic cylinder 2 in a usual manner, 10 a pressure regulating valve of the hydraulic cylinder 2 and 11 a relief valve for the hydraulic oil flowing through the oil line 3. .

The press-fitting pile driving machine according to the present embodiment has the above-mentioned structure. The pile driving machine described below is used to form a driving pile such as a steel sheet pile in which the upper layer is soft ground and the lower layer is hard ground. A case of press-fitting into the ground of the stratum formed in and driving it will be described.

First, as shown in FIG. 1A, a driving pile 13 such as a steel sheet pile held by the chuck device 12 is press-fitted into the ground 14 through the hydraulic cylinder 2 to which the chuck device 12 is attached. In this case, when the upper layer of the ground is the soft ground 14a, the driving pile 13 such as the steel sheet pile can be pressed and driven to a predetermined depth only by the pressing force of the hydraulic cylinder 2. Driving piles such as steel sheet piles, etc. 13
However, when reaching the stratum formed by the hard ground 14b, the driving pile 13 cannot be further press-fitted only by the normal pressing force of the hydraulic cylinder 2.

Therefore, the driven pile 13 such as a steel sheet pile driven as described above reaches the formation formed by the hard ground 14b, and the ordinary driven force of the hydraulic cylinder 2 alone causes the driven pile to be driven.
When it becomes impossible to press-fit 13, the solenoid valve 6 of the hydraulic booster 2a is actuated to operate the predetermined oil pipe 3
By closing the above, an oil hammer will occur in the oil line 3.

Therefore, the working oil having a pressure higher than that of the hydraulic power source generated by the oil hammer is sent to the hydraulic cylinder 2 through the check valve 5, and the pressure in the hydraulic cylinder 2 can be instantly increased. I can.

Therefore, as described above, the solenoid valve 6 can be used if necessary.
By opening and closing, the pressure inside the hydraulic cylinder 2 can be instantly increased (arrow A) as shown in FIG.
By pressing (arrow B) the chuck device 12 mounted on the hydraulic cylinder 2 to further descend, the hard ground is driven through the driving pile 13 gripped by the chuck device 12.
It is possible to easily press-in (arrow C) the driven pile by causing a volume change in 14b.

Further, since the hydraulic pressure booster 2a is provided with a computer 7 for controlling the opening / closing amount and / or the opening / closing time of the solenoid valve 6 by the pulse width sent to the solenoid valve 6, the computer 7 is provided. It is also possible to finely adjust the amount of pressure increase after the oil hammer has occurred via 7.

In the above embodiment, the hydraulic pressure booster includes an oil pump for sending a predetermined amount of oil to the oil pipe, and a flow of hydraulic oil flowing through the oil pipe at a high speed via the oil pump. A solenoid valve that causes an oil hammer in a predetermined oil pipeline by closing the oil pipeline to prevent it instantaneously, a computer that controls the opening and closing amount and / or the opening and closing time of the solenoid valve, and by closing the solenoid valve And a check valve for taking out only the hydraulic oil whose pressure is higher than that of the hydraulic source due to the generated oil hammer, and the computer controls the opening / closing amount and / or the opening / closing time of the solenoid valve according to the pulse width sent to the solenoid valve. By controlling it, the amount of pressure increase after oil hit is adjusted, but the point is that when driving the driving pile through the hydraulic cylinder, oil hit is generated in the oil pipeline of the hydraulic cylinder. Therefore, as long as it is possible to increase the pressure by sending hydraulic oil having a pressure higher than that of the hydraulic source to the hydraulic cylinder, the specific type and quantity of the hydraulic cylinder, oil pump, solenoid valve, check valve, etc. The present invention is not limited to the above, and a configuration in which the amount of pressure increase after an oil strike occurs is controlled by controlling the opening / closing amount and / or opening / closing time of a solenoid valve by a pulse width sent to the solenoid valve by a computer. It goes without saying that it is not an essential requirement in the.

Therefore, the hydraulic pressure booster according to the present invention, and the oil pipeline, hydraulic cylinder, and the hydraulic line that constitute the hydraulic pressure booster
Specific types, quantities, shapes of oil pumps, various valves, etc.
All the mounting locations and the like can be arbitrarily modified within the scope intended by the present invention.

[0027]

As described above, according to the present invention, when a driving pile is driven through a hydraulic cylinder provided in a press-fitting type pile driver, an oil hammer is generated in an oil pipe line of the hydraulic cylinder. Since a hydraulic pressure booster that feeds hydraulic oil that is at a higher pressure than the hydraulic pressure source to the hydraulic cylinder to increase the pressure is provided, the hard ground prevents press-fitting of the driving pile through the hydraulic cylinder. Even when the hydraulic pressure is applied, the hydraulic oil having a pressure higher than that of the hydraulic pressure source is sent to the hydraulic cylinder to increase the pressure through the oil hammer, so that the pressing force of the hydraulic cylinder can be instantaneously increased.

Therefore, the pressing force of the hydraulic cylinder is instantaneously increased, so that an instantaneous volume change is generated in the hard ground through the driving pile held by the chuck device mounted on the hydraulic cylinder. After that, the driven pile can be easily press-fitted.

Therefore, even if the ground into which the driving piles are press-fitted is the one formed by the soft ground at the upper layer and the hard ground at the lower layer, a hammer pile driving machine (not shown) or a vibrating pile driving machine. It is special that the driving pile of steel sheet pile can be driven into the hard ground by pressing force of the hydraulic cylinder without using (not shown) and without causing noise pollution. It came to have an effect.

[Brief description of drawings]

FIG. 1 shows a hydraulic pressure booster for a press-fitting type pile driver in one embodiment of the present invention. FIG. 1 (a) is a basic schematic diagram and FIG. 1 (b).
Is an enlarged view of the main parts during operation.

FIG. 2 is a partially sectional front view showing a usage state of a conventional press-fitting type pile driver.

[Explanation of symbols]

 1 ... Press-fit type pile driver 2 ... Hydraulic cylinder 2a ... Hydraulic pressure booster 3 ... Oil pipeline 4 ... Oil pump 5 ... Check valve 6 ... Solenoid valve 7 ... Computer 8 ... Accumulator 9 ... Manual operation valve 10 ... Pressure adjusting valve

Claims (3)

[Claims] 1. A press-fitting type pile driving machine configured to drive a predetermined driving pile into the ground by pressing force of the hydraulic cylinder, wherein the hydraulic cylinder (2) includes a hydraulic cylinder (2). ) When driving the driving pile (13) into the hydraulic cylinder (2), an oil hammer is generated in the oil pipe (3) of the hydraulic cylinder (2). A press-fitting pile driving machine, characterized in that it is provided with a hydraulic pressure booster (2a) for feeding into (2) to boost pressure. 2. The hydraulic line is provided in the hydraulic pressure booster (2a).
Solenoid valve that causes oil hammer by closing (3) (6)
And a computer (7) for controlling the opening / closing amount and / or opening / closing time of the solenoid valve (6), and the computer (7) controls the opening / closing amount and / or opening / closing time of the solenoid valve (6). By controlling the pulse width sent to the solenoid valve (6),
The press-fitting pile driving machine according to claim 1, wherein the pressurizing type pile driver is configured to adjust a pressure increase amount after an oil hammer. 3. The hydraulic pressure booster (2a) is provided with a check valve (5) for taking out only the hydraulic oil whose pressure is higher than the hydraulic pressure source due to the occurrence of oil hammer. The press-fitting type pile driver according to claim 1 or 2.