JPH06220851A - Vibrating pile driving method and device - Google Patents

Abstract

PURPOSE:To drive a pile without using a crane and perform the automatic control of the driving work by detecting the load of a vibration generator, and changing the flow of an operating liquid flowing in oil passages communicating a lift jack and a hydraulic feed source in response to the load. CONSTITUTION:A pile 10 is vibrated by a vibration generator 16, and the pile 10 is driven by a hydraulic jack 28. When the drive quantity of the pile 10 is increased and the resistance is increased, the load of the vibration generator 16 is increased. The load of the vibration generator 16 is detected, and the flow of an operating liquid flowing in oil passages L1, L2 communicating the hydraulic jack 28 and a hydraulic feed source is changed in response to the load. The lowering speed of the hydraulic jack 28 is changed in response to the load of a vibrating motor 18, and the automatic control of the pile driving work can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for driving a pile into the ground without using a lifting machine, and more particularly to a vibrating pile driving method and apparatus capable of automatically controlling the work for driving the pile.

[0002]

2. Description of the Related Art As a method for driving a pile into the ground, for example, a disel hammer, a monken, a hydraulic hammer, or an air hammer is used to add a striking force to the pile striking portion, or a vibro hammer is used to pile the pile. There are two methods, a vibrating pile driving method, in which the peripheral frictional force is reduced to drive the ground. Here, in all of these methods, it was necessary to install a pile driving machine on the head of the pile, and a pile driving tower or a large crane was required. on the other hand,
In places where there is a sky restriction such as under the bridge or under the overhead contact line, the upper part of the pile driver, the boom of the crane, and the hook become so-called dead spaces, making it difficult to drive long piles and increasing the number of joint piles. , Work efficiency is reduced.

On the other hand, the applicant of the present invention has filed Japanese Patent Application Laid-Open No. 4-312
A pile driving method and apparatus as shown in Japanese Patent No. 615 have been proposed.
According to this pile driving method and device, since it is not necessary to install the pile driving machine on the head of the pile, a large auxiliary equipment such as a crane is not required, and even when the height of the sky is limited, the continuous pile is piled. It is possible to improve work efficiency without increasing the quantity of.

[0004]

[Patent Document 1] Japanese Patent Application Laid-Open No. 4-31261
Since the pile driving method and device shown in Japanese Patent No. 5 is a new technology in itself, the equipment necessary for automating the work of driving the pile by the lifting jack while the pile is vibrated by the vibration generator is proposed. It has not been.

More specifically, when the work of performing pile driving by the lifting jack is performed, pressure liquid is supplied to the lifting jack or discharged from the lifting jack to lower the grasping means for grasping the pile. There is a need. At that time, as the grasping means descends and the pile to be driven descends, the frictional resistance acting on the pile changes (increases), so it is desirable to slow down the descending speed of the lifting jack. On the other hand, when the pile is not driven deeply, the frictional resistance that acts during driving is small, so it is desirable to increase the driving speed of the pile by the lifting jack.

However, there has not yet been provided a method and apparatus for realizing automatic control such that the descending speed of the lifting jack is changed in response to the resistance which changes in accordance with the driving amount of the pile.

The present invention has been proposed in view of such problems of the prior art, and it is possible to drive a pile into the ground without using a lifting machine, and further, an automatic control of the work for driving the pile. The purpose of the present invention is to provide a vibrating pile driving method and device.

[0008]

In the vibrating pile driving method of the present invention, the grasping means provided with a vibration generator is supported at a predetermined position by being supported by a lifting jack operated by hydraulic pressure, and the grasping means is used to In the vibrating pile driving method of grasping the middle portion and vibrating the pile with the vibration generator, and driving the pile with the lifting jack, in the step of detecting the load of the vibration generator, in response to the detected load, And a step of changing the flow rate of the working liquid flowing through a liquid passage that connects the lifting jack and the pressure liquid supply source.

Further, the vibrating pile driving apparatus of the present invention comprises a vibration generator for vibrating the pile, grasping means for grasping the middle portion of the pile, and lifting and lowering by hydraulic pressure while supporting the grasping means. In a vibrating pile driving device including a lifting jack for performing pile driving, load detecting means for detecting a load of a vibration generator, and a liquid communicating between the lifting jack and a pressure liquid supply source in response to the detected load. Flow rate changing means for changing the flow rate of the working liquid flowing through the passage.

Here, the lifting jack is preferably a hydraulically operated jack. That is, it is preferable that the hydraulic pressure is hydraulic pressure and the pressurized liquid is pressurized oil.

In carrying out the present invention, the output pressure of the vibro motor included in the vibration generator and operating hydraulically is detected by the pressure converter, converted into a current (voltage) signal corresponding to the detected pressure, and the pressure is converted. Adjust the opening of the electromagnetic proportional flow control valve with the output current (voltage) of the converter,
Therefore, it is preferable to control the flow rate of the working liquid (for example, pressure oil) supplied to the lifting jack.

Here, the electromagnetic proportional flow control valve may be provided in a liquid passage (oil passage) for supplying and discharging pressurized liquid (pressure oil) to the upper portion of the cylinder of the lifting jack.
Alternatively, it may be provided in a liquid passage (oil passage) through which the pressure liquid (pressure oil) supplied and discharged to the lower portion of the cylinder of the lifting jack flows. Further, the electromagnetic proportional flow control is performed only in one of the liquid passage (oil passage) communicating with the upper cylinder of the lifting jack and the liquid passage (oil passage) communicating with the lower cylinder of the lifting jack. It is also possible to install a valve and to install an electromagnetic proportional relief valve in the other liquid passage (oil passage) to open and close the liquid passage (oil passage).

[0013]

According to the vibrating pile driving method of the present invention having the above-mentioned structure, the grasping means having the vibration generator is supported by the lifting jack operated by hydraulic pressure and fixed at a predetermined position,
The middle portion of the pile is grasped by this grasping means, and the pile is driven by the lifting jack while the pile is vibrated by the vibration generator.
Here, when the driving amount of the piles increases and the resistance increases, the load of the vibration generator also increases. Therefore, according to the present invention, the load of the vibration generator is detected, and in response thereto, the flow rate of the working liquid flowing through the liquid passage that connects the lifting jack and the pressure liquid supply source is changed.

More specifically, when the load of the vibration generator increases, in the pressure liquid circuit (pressure oil circuit), a liquid passage (oil passage) communicating with the pressure liquid (pressure oil) is provided above the cylinder of the lifting jack. The liquid passage (oil passage) communicating with the lower part of the cylinder of the lifting jack is throttled to reduce the flow rate, thereby slowing down the descending speed of the lifting jack. On the other hand, when the pile driving amount is small and the load on the vibration generator is small, maintain a high flow rate of the working fluid without restricting the fluid passage (oil passage) communicating with the upper or lower part of the cylinder of the lifting jack. , The lowering speed of the lifting jack is faster.

When the lifting jack is lowered by one stroke (when driving is performed to a predetermined depth), the vibration generator is stopped, the pile is released from the grasping device, and the lifting jack is raised by one stroke. Let As a result, only the grasping device is raised to a predetermined height while the pile is left as it is. Then, the pile is grasped again and the above-mentioned work is repeated.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, H to be driven into the ground
The steel pile is designated by 10. The pile 10 is grasped and supported by the grasping means 12. The vibrating pile driver includes a chuck 14 that holds the pile 10 and a vibration generator 16. The vibration generator 16 is a hydraulically operated vibro motor 18 and a lower eccentric body 20 that cooperates with the motor 18 to generate vibration. , An intermediate eccentric body 22, and an upper eccentric body 24.

The vibration generator 16 is attached to a hydraulic jack (elevation jack) 28 through a vibration-proof rubber 26, and the piston of the hydraulic jack expands and contracts to raise or lower the vibrating pile driver. Oil passages L1 and L2 communicate with the upper and lower portions of a cylinder 30 of the hydraulic jack 28, and the oil passages L1 and L2 communicate with a hydraulic power unit 34 that is a working fluid source via an electromagnetic hydraulic switching valve 32. There is.

The power unit 34 includes oil passages L3 and L.
4, electromagnetic hydraulic switching valve 36, pressure converter 38, line L5
And the vibro motor 1 of the vibration generator 16 via L6.
It also communicates with 8. Here, since the pressure of the vibro motor 18 changes according to its load, the pressure of the pressure oil flowing through the lines L5 and L6 also changes according to the load acting on the motor 18 when driving the pile. Then, the pressure converter 38 provided in the lines L5 and L6 outputs a current (voltage) signal corresponding to the pressure of the pressure oil flowing in the lines L5 and L6 to the control line CL1. The control line CL1 is connected to the electromagnetic proportional flow control valve 40,
The valve 40 is interposed in an oil passage L2 communicating with the lower portion of the cylinder 30 of the hydraulic jack 28.

In FIG. 1, reference numeral 42 is an oil passage L1.
, 44 is a pressure gauge interposed in the oil passage L2, 46 is a base for supporting the hydraulic jack 28, and 48 is a base 46 installed at a predetermined position. An arm or an outrigger used for the above, reference numeral 50 is a position detector.

FIG. 2 shows a flow chart mainly focusing on the flow of pressure oil which is the working fluid in the embodiment of FIG. In FIG. 2, the word “Q; flow rate” means the flow rate of pressure oil, the word “P; pressure” means that the flow or pressure of the pressure oil operates, and “I: current”. The wording “” means that the current (voltage) signal output from the pressure converter 38 is transmitted to the electromagnetic proportional flow control valve 40, and the wording “F; press fit” is the H steel pile 10.
Means that the hydraulic jack 28 is pushed down into the ground.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIGS. 1 and 2 described above and FIG. 3 which is a flowchart showing the control of the hydraulic jack 28 for each stroke.

First, lines L3, L4, electromagnetic hydraulic switching valve 36, lines L5, L6 from the hydraulic power unit 34.
The pressure oil, which is the working fluid, is supplied to the vibro motor 18 via (step S1 in FIG. 3). Here, the pressure of the pressure oil returning from the motor to the power unit 34 fluctuates according to the resistance to driving the piles at this stage or the load on the motor 18. The pressure converter 38 interposed in the lines L5 and L6 converts the pressure of the pressure oil returned from the vibro motor 18, that is, the output pressure into a corresponding current (voltage) signal (step S2).

This current (voltage) signal is the control line CL1.
To the electromagnetic proportional flow control valve 40 via. Then, it is determined whether or not the current (voltage) signal is within a predetermined range (step S3). When the pile driving amount is relatively small, the load on the vibro motor 18 is small and the motor output pressure is also low.
The value of the current (voltage) signal generated in is also small. for that reason,
In step S3, it is determined that it is within the predetermined range (YES in step S3). In this case, since the resistance to driving the pile is small, it is not necessary to limit the descending speed of the hydraulic jack 28. Therefore, the opening of the electromagnetic proportional flow control valve 40 is not reduced and the flow rate of the line L1 is set to be large (step S4).

On the other hand, if the pile driving amount is large, the load on the vibro motor 18 also increases and the motor output pressure increases. Therefore, the current (voltage) generated in the pressure converter 38
The value of the signal also increases, and it is determined in step S3 that the value is out of the predetermined range (NO in step S3). In this case, the resistance to driving the pile is large,
Since it is necessary to limit the descending speed of the hydraulic jack 28, the opening of the electromagnetic proportional flow control valve 40 is narrowed and the flow rate of the pressure oil flowing through the line L1 is limited (step S5).

The above "predetermined range" can be freely changed according to the conditions of the pile driving work site.

Next, it is judged whether or not the pressure of the vibro motor 18 is within the allowable value (step S6), and if it is outside the allowable value (step S6 is NO), the vibro motor 1 is determined.
8 is returned to the stage before the operation. Similarly, it is determined whether the driving speed is within the set value (step S7). Here, if step S7 is NO, the process returns to the stage before the operation of the vibro motor 18 as in step S6. Further, it is judged whether the driving pile length can still be obtained (step S8), and if it can be obtained (step S8).
If 8 is YES), the process from step S2 is repeated.

Thereafter, by performing the same process as the technique described in Japanese Patent Laid-Open No. 4-313615, the work of driving the pile 10 into the ground is completed.

The electromagnetic proportional flow control valve 40 of FIG. 1 is provided in the line L1 communicating with the upper portion of the cylinder 30 of the hydraulic jack 28, but as shown by reference numeral 40A in FIG. 4, the line communicating with the lower portion of the cylinder 30. It may be provided in L2. Further, as shown in FIG. 5, the electromagnetic proportional flow control valve 40 is provided on both the line 1 and the line 2.
40A may be provided. However, since the configuration and operation of the embodiment of FIG. 4 or FIG. 5 are almost the same as the embodiment of FIG. 1,
A duplicate description will be omitted.

It should be noted that the illustrated embodiment is merely an example and is not intended to limit the technical scope of the present invention. For example, in the embodiment of FIG. 5, it is possible to replace one of the electromagnetic proportional flow control valves with an electromagnetic proportional relief valve and perform control such that a line (oil passage) having the electromagnetic proportional relief valve is opened and closed. .

[0031]

The effects of the present invention are listed below.

(1) The descending speed of the hydraulic jack can be changed in response to the load of the vibro motor.

(2) The optimum driving speed can be achieved according to the resistance to driving the pile.

(3) In connection with the fact that an optimum driving speed can be achieved according to the resistance to driving a pile, it is possible to automatically control the pile driving work.

(4) A pile can be driven into the ground without using a lifting machine.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram mainly showing the flow of pressure oil in the form of a flow chart in the embodiment of FIG.

FIG. 3 is a diagram showing a control flowchart in the embodiment of FIG.

FIG. 4 is a block diagram of another embodiment of the present invention.

FIG. 5 is a block diagram of yet another embodiment of the present invention.

[Explanation of symbols]

10 ... H steel pile 12 ... Grasping means 14 ... Chuck 16 ... Vibration generator 18 ... Vibro motor 20 ... Lower eccentric body 22 ... Intermediate eccentric body 24 ... Upper part Eccentric body 26 ... Anti-vibration rubber 28 ... Hydraulic jack (elevating jack) 30 ... Cylinder L1, L2, L3, L4, L5, L6 ... Hydraulic line (oil passage) 32, 36 ... Electro-hydraulic switching valve 34 ... Hydraulic power unit 38 ... Pressure converter 38 CL1 ... Control line 40, 40A ... Electromagnetic proportional flow control valve 42, 44 ... Pressure gauge 46 ... Base ( Base) 48 ... Arm (outrigger) 50 ... Position detector

Claims (2)

[Claims] 1. A grasping means having a vibration generator is supported by a lifting jack operated by hydraulic pressure and fixed at a predetermined position,
Grasping the middle part of the pile with the grasping means, in the vibrating pile driving method of driving the pile with the lifting jack while vibrating the pile with the vibration generator, the step of detecting the load of the vibration generator and detected. And a step of changing a flow rate of a working liquid flowing through a liquid passage communicating between the lifting jack and a pressurized liquid supply source in response to a load. 2. A vibration generator for applying vibration to the pile,
A load for detecting a load of a vibration generator in a vibrating pile driving device including a grasping means for grasping an intermediate portion of the pile, and an elevating jack for supporting the grasping means to vertically elevate and hydraulically perform pile driving. A vibrating pile driving apparatus including: a detection unit; and a flow rate changing unit that changes a flow rate of a working liquid flowing through a liquid path that connects the lifting jack and a pressure liquid supply source in response to the detected load. .