JPS6024750Y2 - vibrating pile driver - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a vibratory pile driver.

Pile driving and pile extraction work using a vibrating pile driver involves vibrating the pile by vibrating the pile in its longitudinal direction, and using this vibration force to drive the pile into the soil or pull it out from the soil. The ground vibrations spread over a wide area and have an unfavorable effect on buildings or people living nearby.

For this reason, the reality is that the places where work can be done are severely limited by the environment.

In view of the above points, the present invention aims to provide a vibratory pile driver with a simple structure that can suppress the vibration of the ground that occurs during pile driving and pile extraction work within an extremely limited narrow range. .

The vibratory pile driver of the present invention will be explained below based on the drawings.

In the figure, A is a vibratory pile driver according to the present invention.

B and C are respectively slidably inserted into the cylinder 1 and the inside of the cylinder 1 into two opposing oil chambers 2 and 3.
The movement of piston 4 is divided into cylinder 1
This is a hydraulic vibration actuator consisting of a piston rod 5 led out and a pile connector 6 provided at the outer end of the piston rod 5.

The vibratory pile driver A includes hydraulic vibratory actuators B and C.
The cylinders 1 are arranged side by side with each other so that the pile connectors 6 of
A rotary valve is installed between them to control the supply and discharge of hydraulic oil to the hydraulic vibration actuators B and C.

When the hydraulic vibration actuators B and C are arranged side by side as described above, each cylinder 1 of the hydraulic vibration actuators B and C is drilled and arranged side by side in a member E having a large mass. When arranging a rotary valve consisting of a rotor 7 and a housing part 8 for rotatably housing the rotor 7 between the hydraulic vibration actuators B and C arranged in parallel, it is necessary to A housing part 8 for the rotary valve is bored between 1 and 1,
The rotor 7 is rotatably accommodated in this.

The rotor 7 of the rotary valve valve has a first land 9 and a second land 10, and a neck portion 11 that connects these lands.
The housing portion of the rotary valve valve is divided into an upper chamber 12, a central chamber 13, and a lower chamber 14 by these two land portions.

High pressure oil is supplied to the central chamber 13 from the outside of the vibratory pile driver A through a supply boat 15, and the upper chamber 13 and the lower chamber 14 are supplied with boats 16 and 17 to the outside of the vibratory pile driver A.
Hydraulic oil is drained through.

An oil passage 18 having one end opened to the oil chamber 2 of the hydraulic vibration actuator B and the other end opened to a position facing the outer periphery of the first land 9.
, an oil passage 19 with one end opened in the oil chamber 3 of the hydraulic vibration actuator B and the other end opened in a position facing the outer periphery of the second land portion 10, one end opened in the oil chamber 2 of the hydraulic vibration actuator C, and the other end opened in the oil chamber 2 of the hydraulic vibration actuator C. An oil passage 20 opens at a position facing the outer periphery of the first land 9, and an oil passage 21 whose one end opens into the oil chamber 3 of the hydraulic vibration actuator C and the other end opens at a position facing the outer periphery of the second land 10. are respectively drilled into a member E having a large mass.

The first land 9 of the rotary valve has an oil passage 1 on its outer periphery.
grooves 2 for alternately connecting oil passages 8 and 20 to the central chamber 13;
2, and grooves 23 for alternately connecting the oil passages 20 and 18 to the upper chamber 12 are bored.

In addition, on the second land 10 of the rotary valve, on its outer periphery,
Grooves 24 for alternately connecting the oil passages 21 and 19 to the central chamber 13 and grooves 25 for alternately connecting the oil passages 19 and 21 to the lower chamber 14 are bored.

By its rotation, the rotary valve valve connects the oil chamber 2 of the hydraulic vibration actuator B to the central chamber 13 via the oil passage 18 and the groove 22, and also connects the oil chamber 2 of the hydraulic vibration actuator B
The oil chamber 1 of the hydraulic vibration actuator C is connected to the lower chamber 14 through the oil passage 19 and the groove 25, and while the piston of the hydraulic vibration actuator B is being driven downward, the oil chamber 1 of the hydraulic vibration actuator C is connected to the lower chamber 14 through the oil passage 19 and the groove 25.
L A supply that connects to the upper chamber 12 via the groove 23 and connects the oil chamber 3 of the hydraulic vibration actuator C to the central chamber 13 via the oil passage 21 and the groove 24 to drive the piston 4 of the hydraulic vibration actuator C upward. The oil chamber 2 of the hydraulic vibration actuator C is connected to the central chamber 1 through the oil passage 20 and the groove 22.
3 and the oil chamber 3 of the hydraulic vibration actuator C.
is connected to the lower chamber 14 via the oil passage 21 and groove 25, and while driving the piston 4 of the hydraulic vibration actuator C downward, the oil chamber 1 of the hydraulic vibration actuator B is connected to the oil passage 18, i2.
3 to the upper chamber 12, and also connects the oil chamber 3 of the hydraulic vibration actuator B to the central chamber 13 through the oil passage 19 and the groove 24, and drives the piston 4 of the hydraulic vibration actuator B upward. and are repeated alternately.

That is, the rotary valve valve supplies hydraulic fluid to each hydraulic vibration actuator B so as to drive the piston 4 of one hydraulic vibration actuator B (or C) downward and to drive the other hydraulic vibration actuator C (or B) upward.
, the supply/discharge position for supplying and discharging oil to each of the oil chambers 2 and 3 of C, and the piston 4 of the other hydraulic vibration actuator C (or B) being driven downward, and one hydraulic vibration actuator B (
Alternatively, the supply and discharge positions for supplying and discharging hydraulic oil to each oil chamber 2 and 3 of each hydraulic vibration actuator B and C are alternately repeated so as to drive the piston 4 upward in C).

Reference numeral 26 denotes a hydraulic motor for rotationally driving the rotary valve valve, and its rotation is controlled by a suitable hydraulic control device (not shown).

Further, 27 is a hanging tool for suspending the vibrating pile driver A, and the hanging tool 27 suspends the upper center of the large mass member E via a spring 28.

In addition, 29 is an expansion cavity type accumulator installed in a large mass member E in the middle of the oil passage that supplies high-pressure hydraulic oil to the central chamber 13 of the rotary valve, and 30 is an accumulator that is installed in the upper chamber of the rotary valve. This is an expansion cavity type accumulator installed in a large mass member E in the middle of the oil path that discharges hydraulic oil from the lower chamber 13, and these accumulators 29 and 30 both absorb pressure fluctuations that occur when the rotary valve is switched. It is something to do.

Next, the action will be explained.

When driving piles using the vibrating pile driver A, the lifting tool 27 of the vibrating pile driver A is lifted up by a suitable means such as a crane, and the upper end of the pile to be driven into the pile connecting devices 6, 6 is lifted up by a suitable means such as a crane. Connect parts.

Then, with the lower end of the pile in contact with the ground, the hydraulic vibration actuators B and C of the vibration pile driver A are driven.

In this drive, high pressure oil is supplied to the central chamber 13 of the rotary valve, and hydraulic oil is discharged from the upper chamber 12 and lower chamber 14, and the rotary valve is rotationally driven by the hydraulic motor 26.

By the rotation of the rotary valve, hydraulic oil is supplied and discharged from the oil chambers 2 and 3 of the hydraulic vibration actuators B and C, and the hydraulic vibration actuators B and C are driven to vibrate.

At this time, the hydraulic vibration actuators B and C are each 180
vibrates with a phase difference of ° (the piston rod 5 of the hydraulic tl actuator B extends with respect to its cylinder 1 (
During the contraction), the piston rod 5 of the hydraulic vibration actuator C contracts (extends) relative to its cylinder 1.

). The vibration drive of the vibratory pile driver A drives the piles into the soil by vibrating the piles connected to the hydraulic vibration actuators B and C with a phase difference of 180° in the longitudinal direction. However, the vibrations that occur in the ground when driving piles are canceled out by the vibrating piles with a phase difference of 180 degrees, so the vibrations are limited to as narrow a range as possible.

The vibration of the ground when pulling out a pile driven into the ground is similarly limited to a narrow range.

The vibratory pile driver, which is configured and operated as described above, can suppress the ground vibrations that occur during pile driving and pile extraction work within an extremely narrow range, so the work is not restricted by the environment. Because the structure is simple,
Its practical effects are extremely large.

In addition, in the case where the hanging tool 27 is arranged in the center of the large-mass member E as in the embodiment, the vibration generated in the large-mass member E during the vibration drive of the vibratory pile driver A will cause damage to the large-mass member E. Since the rocking vibration is centered near the center, the vibration force transmitted to the crane or other lifting machine via the lifting device can be suppressed as much as possible, extending the life of the crane or other lifting machine. This has an effect that can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the vibratory pile driver of the present invention, and FIG. 2 is a sectional view taken along line XX in FIG. A; Vibratory pile driver, B, C; Hydraulic vibration actuator, D
; Rotary valve; 1; Cylinder; 2°; 3: Oil chamber; 4; Piston; 5; Piston rod; 6; Pile connector.

Claims (1)

[Scope of utility model registration request] A cylinder 1, a piston 4 that is slidably inserted into the cylinder 1 and partitions the inside of the cylinder 1 into two opposing oil chambers 2 and 3, a piston rod 5 that guides the movement of the piston 4 out of the cylinder 1, and A pair of hydraulic vibration actuators B consisting of a pile connector 6 provided at the outer end of a piston rod 5
, C, the cylinders 2 of which are arranged side by side with their pile connectors positioned below, and a rotary that controls the supply and discharge of pressure oil to the oil chambers of these pair of hydraulic vibration actuators B and C. A valve valve is disposed between the cylinders 1 of the pair of hydraulic vibration actuators B and C arranged in parallel, and the rotary valve valve drives the piston 4 of one of the hydraulic vibration actuators B (or C) downward. supply and discharge positions for supplying and discharging hydraulic oil to each oil chamber 2 and 3 of each hydraulic vibration actuator B and C so as to simultaneously drive the piston 4 of the other hydraulic vibration actuator C (or B) upward; Hydraulic oil is supplied to each oil chamber 2 of each hydraulic vibration actuator B, C so as to drive the piston 4 of vibration actuator C (or B) downward and to drive the piston 4 of one hydraulic vibration actuator B (or C) upward. , 3. A vibratory pile driver characterized by being configured to alternately repeat supply and discharge positions for supplying and discharging to and from the piles.