JPS6116813B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibratory pile driver, and in particular to a hydraulic vibratory pile driver.

This type of pile driving machine has a double-acting hydraulic cylinder, which alternately supplies hydraulic oil from a high-pressure oil passage to both oil chambers of the double-acting hydraulic cylinder, and alternately discharges hydraulic oil from both oil chambers to a tank oil passage. It consists of a valve, and a coupling device disposed at the tip of the piston rod of a double-acting hydraulic cylinder to removably hold the pile head. A large-mass vibration reaction member is provided on the cylinder side in order to effectively transmit relative mechanical vibrations occurring between the piston and piston rod of the double-acting hydraulic cylinder and the cylinder side to the pile head.

In order to achieve this object, the vibratory pile punching machine of the present invention is constructed as follows. That is, the vibratory pile driving machine of the present invention has a rotary type installed between a double-acting hydraulic cylinder, a pair of oil passages communicating with both oil chambers of the double-acting hydraulic cylinder, a high-pressure oil passage, and a tank oil passage. It is a hydraulic switching valve that is rotationally driven by a hydraulic motor, and alternately supplies hydraulic oil from a high-pressure oil passage to both oil chambers of a double-acting hydraulic cylinder in proportion to the rotation speed, and alternately supplies hydraulic oil from both oil chambers. A vibratory pile driving machine comprising a rotary hydraulic switching valve for discharging oil into a tank oil path, and a coupling device disposed at the tip of a piston rod of a double-acting hydraulic cylinder to removably hold the pile head, The hydrodynamic cylinder is constructed by forming the cylinder into a large-mass vibration reaction member, and also includes the hydraulic switching valve and the hydraulic motor for rotationally driving the hydraulic switching valve inside the vibration reaction member. , and further to the vibration reaction member, one end opens to the outside of the vibration reaction member and the other end reaches the hydraulic switching valve, and one end opens to the outside of the vibration reaction member and the other end reaches the hydraulic switching valve. A tank oil passage, a pair of oil passages connecting both oil chambers of the double-acting hydraulic cylinder and the hydraulic switching valve, respectively;
It is constructed by drilling an oil supply/drainage path to the hydraulic motor.

The vibratory pile driving machine of the present invention having such a configuration rotates the hydraulic switching valve with the hydraulic motor while supplying pressure oil to the high pressure oil passage and discharging hydraulic oil from the tank oil passage. According to the double-acting hydraulic cylinder, hydraulic oil is alternately supplied and discharged to both oil chambers of the double-acting hydraulic cylinder, and as a result, the vibration reaction member and the coupling device vibrate relative to each other.
A hydraulic switching valve and a hydraulic motor for rotationally driving the hydraulic switching valve are disposed in the vibration reaction member, and
Since the oil passages connected to the double-acting hydraulic cylinder, hydraulic switching valve, and hydraulic motor are drilled into the vibration reaction member, the structure is extremely simple, and a vibratory pile driving machine that is resistant to vibration can be obtained. It can be done.

The present invention aims to achieve a simple structure required of a hydraulic vibratory pile driver that is exposed to high vibrations by effectively utilizing a large-mass vibration reaction member.

Embodiments of the present invention will be described in detail below with reference to the drawings. In the figure, a vibratory pile driver 1 according to the present invention is a cylindrical cylinder member, and the cylinder member 1 is fitted into a cylinder member receiving hole 3 formed in a large-mass vibration reaction member 2. There is. 4 is a piston fitted into the cylinder member 1 in an oil-tight and slidable manner; 5;
is a piston rod whose base end is integrally fixed to the piston 4, and this piston rod 5 extends downwardly by penetrating the cylinder lower end wall 6 constituted by the vibration reaction member 2 in an oil-tight and slidable manner. There is. The upper end of the cylinder member receiving hole 3 of the vibration reaction member 2 is closed by a cylinder upper end wall 7 bolted to the vibration reaction member 2. Therefore, the piston 4 divides the space defined by the cylinder lower end wall 6 and the cylinder upper end wall 7, which are constituted by the cylinder member and the vibration reaction force member 2, into an upper oil chamber 8 and a lower oil chamber 9. The cylinder lower end wall 6 composed of the piston 4, the piston rod 5, the cylinder member 1, and the vibration reaction member 2, and the cylinder upper end wall 7 bolted to the vibration reaction member 2 constitute a double-acting hydraulic cylinder. do. 10 is a bearing member interposed between the cylinder lower end wall 6 and the piston rod 5, 11 is a packing, and 12 is a bearing member 1.
It is a metal fitting of 0. The piston 4 is further provided with a suspension rod 68 which extends upwardly through the cylinder upper end wall 7 in an oil-tight manner. The vibration reaction member 2 is further provided with a switching valve receiving hole 14 for accommodating a rotary type hydraulic switching valve 13, which will be described later, in parallel with and close to the cylinder member receiving hole 3. The hydraulic switching valve 13 includes a valve sleeve 15 and a rotor 18 that is rotatably fitted into the valve sleeve 15 and has land portions 16 and 17 on top and bottom, respectively. 19, 22, and 24 are annular grooves provided on the outer periphery of the valve sleeve 15, and the annular groove 19 is connected to the rotor 18 by a port 20.
The annular groove 22 communicates with the upper land portion 16 through two ports 23 equally spaced in the circumferential direction of the valve sleeve 15. The groove 24 is the valve sleeve 15
It communicates with the lower land 17 through two ports 25 formed at equal intervals in the circumferential direction. On the outer periphery of the upper land portion 16, there are two notch grooves 26 provided at equal intervals in the circumferential direction to connect the two ports 23 of the valve sleeve 15 and the oil supply chamber 21; In order to connect the port 23 and the oil drain chamber 27 on the upper side of the upper land portion 16, two notch grooves 28 are provided, each having a phase of 90° with respect to the two notch grooves 26 described above. Further, on the outer periphery of the lower land portion 17, two notch grooves 29 are provided at equal intervals in the circumferential direction to connect the two ports 25 of the valve sleeve 15 and the oil supply chamber 21, and two notch grooves 29 are provided on the outer periphery of the lower land portion 17.
In order to connect the two ports 25 of No. 5 and the oil drain chamber 30 on the lower side of the lower land portion 17, two notch grooves 31 are provided with a phase of 90 degrees with the two notch grooves 29, respectively. is provided. And hydraulic switching valve 1
3, when the oil supply chamber 21 and the annular groove 22 are connected by the notch groove 26, the oil drain chamber 30 and the annular groove 24 are connected by the notch groove 31, and the oil supply chamber 21 and the annular groove 24 are connected by the notch groove 29. When the drain chamber 27 and the annular groove 22 are connected by the notch groove 28, the ports 23, 25 and the notch groove 2 are connected by the notch groove 28.
The related positions of 6, 28, 29, and 31 are set. The valve sleeve 15 of the hydraulic switching valve 13 is fitted and held in the switching valve receiving hole 14 of the vibration reaction force member 2, and the rotor 18 of the hydraulic switching valve 13 has its lower end connected to the vibration reaction force via a thrust bearing 32. It is rotatably supported by the member 2, and its upper end is supported by a hydraulic switching valve fitting 35 via a plunger 33 fitted into the axis of the rotor 18 and a thrust bearing 34. Said plunger 33
The pressure receiving chamber 36 is connected to the oil supply chamber 21 by an oil passage 37, and the hydraulic pressure in the oil supply chamber acts on this pressure receiving chamber 36 to generate a downward biasing force on the rotor 18.
This prevents the rotor from shaking up and down due to vibration.

A spline bearing is provided at the lower end of the rotor 18 of the hydraulic switching valve 13, and an output shaft 39 of a hydraulic motor 38 for driving the hydraulic switching valve 13 is spline-coupled to this spline bearing. The hydraulic motor 38 is also fitted into a hydraulic motor receiving hole 40 formed in the vibration reaction member 2, and is fixed by a hydraulic motor holding fitting 41.

42 is an annular groove provided on the outer periphery of the upper end of the cylinder member 1, and is connected to the upper oil chamber 8 through a port 43. 44 is an annular groove provided on the outer periphery of the lower end of the cylinder member 1, and the port 45 connects to the lower oil chamber 9.
is connected to. Reference numeral 46 denotes a high-pressure oil passage having one end opened to the outside of the vibration reaction force member 2 and the other end bored into the vibration reaction force member 2 so as to reach the annular groove 19 of the hydraulic switching valve 13;
Reference numeral 47 denotes a tank oil passage 48 which is opened into the vibration reaction member 3 so that one end thereof is opened to the outside of the vibration reaction force member 2 and the other end thereof reaches the oil drain chambers 27 and 30 of the hydraulic pressure switching valve 13.
49 is an annular groove 24 of the hydraulic switching valve 13, which is connected to the annular groove 22 of the hydraulic switching valve 13 and the upper oil chamber 8 of the double-acting hydraulic cylinder, and is bored into the vibration reaction member 2.
This is an oil passage bored into the vibration reaction member 2 by connecting the lower oil chamber 9 of the double-acting hydraulic cylinder. Also, 50
51 is a high-pressure oil passage for the hydraulic motor, which is bored into the vibration reaction member 2 so that one end is opened to the outside of the vibration reaction member 3 and the other end reaches the oil supply port of the hydraulic motor 38; 51 is a discharge of the hydraulic motor 38; Port and the tank oil passage 47
This is a tank oil passage for the hydraulic motor 38 which is connected to the vibration reaction force member 3 and is bored in the vibration reaction member 3.

Reference numeral 52 denotes a disk-shaped metal bellows disposed between the piston rod 5 and the vibration reaction member 2. The metal bellows 52 allows movement of the piston rod 5 in the axial direction with respect to the vibration reaction member 2, but prevents vibration. A connecting device 53 disposed at the tip of the piston rod 5 prevents rotation of the piston rod 5 relative to the reaction member 2 and removably connects the pile head to the vibration reaction member 2. This prevents it from rotating. The metal bellows 52 is attached to the piston rod 5 by bolting to the outer flange 56 of a metal fitting 55 that fits into and abuts a step 54 provided at the tip of the piston rod 5.

The connecting device 53 consists of a connecting device main body 57 and a gripping portion 59 that is swingably supported on the connecting device main body 57 via a shaft 58 and has a receiving groove 60 in the pile head. The grip part 59 has a cylinder 6 for fixing the pile.
A pressing pad 62 which is pressed in the direction of the receiving groove 60 by the pad 1 and a supporting pad 63 provided opposite to the pressing pad 62 are provided. A hydraulic cylinder 64 is provided between the grip portion 59 and the coupling device main body 57 to adjust the swing of the grip portion 59 about the shaft 58 . The connecting device 53 is attached to the tip of the piston rod 5 by inserting the boss 65 of the connecting device main body 57 into the narrow diameter portion 66 at the tip of the piston rod 5 from below, and with its upper surface in contact with the metal fitting 55. This is done by tightening a nut 67 that is screwed into the narrow diameter portion.

Reference numeral 69 denotes an accumulator chamber which is bored into the vibration reaction member 2 and sealed with a plug 70, and an air bladder 71 held by the plug 70 is accommodated in the accumulator chamber 69. There is. This accumulator chamber 69 is bored in the vibration reaction member 2 and connected to the annular groove 19 of the hydraulic switching valve 13 via an oil passage 72, and when the hydraulic switching valve 13 is switched, the accumulator chamber 69 is connected to the annular groove 19 of the hydraulic switching valve 13. This absorbs the pulsation of oil pressure occurring within the oil supply chamber 21. (Fig. 2) 73 is a high pressure oil passage 46 bored in the vibration reaction member 2
Hose for supplying high pressure oil to. 74 is a hose for discharging hydraulic oil from the tank oil passage 47 bored in the vibration reaction member 2, and 75 is a hose for supplying pressure oil to the high pressure oil passage 50 for the hydraulic motor bored in the vibration reaction member 2. . 76 is a balance hole provided in the vibration reaction force member 2.

Next, the operation of the above-mentioned vibratory pile driver of the present invention will be explained. The vibratory pile driver is used by suspending the upper end of its suspension rod 68 from a crane or the like via a suitable shock absorber. First, to explain the case of driving a pile, the head of the pile is inserted into the receiving groove 60 of the connecting device 53 of the vibrating pile driver in a suspended state, and the pile fixing cylinder 61 is activated to connect the pile. It is fixed to the device 53. Next, bring the bottom end of the pile into contact with the other surface into which it is to be driven. In this state, high pressure oil is supplied through the hose 73 to the high pressure oil passage 46 formed in the vibration reaction member 2, and hydraulic oil is discharged from the tank oil passage 47 formed in the vibration reaction member 2 through the hose 74. Further, pressure oil is supplied through the hose 75 to the high-pressure oil passage 50 for the hydraulic motor, which is bored in the vibration reaction member 2 . Pressure oil supplied by the hydraulic hose 75 is transferred to the hydraulic switching valve 1
The driving hydraulic motor 38 of No. 3 is rotated, and the valve rotor 18 of the hydraulic switching valve 38 is rotated. valve rotor 1
The rotation of 8 is caused by the hydraulic switching valve 13 passing through the hose 73.
The high pressure oil supplied to the oil supply chamber 21 of the hydraulic switching valve 13 is selectively supplied to the annular grooves 22 and 24 of the hydraulic switching valve 13, and the hydraulic oil is transferred from the annular grooves 24 and 22 to the oil drain chambers 30 and 27 of the hydraulic switching valve 13. selectively excreted. The annular grooves 22 and 24 of the hydraulic switching valve 13 are connected to the upper oil chamber 8 and lower oil chamber 9 of the double-acting hydraulic cylinder through oil passages 48 and 49 drilled into the vibration reaction member 2, respectively. 8 and the lower oil chamber 9 alternately pressurize and depressurize, and the vibration reaction member 2, the piston 4, the piston rod 5, the connecting device 53, and the pile connected to the connecting device 53 vibrate relative to each other. (Since the vibration reaction member 2 has a large mass, most of the relative vibration is transmitted to the pile head.) At this time, the vibration frequency is determined by the rotation speed of the hydraulic motor 38 for driving the hydraulic switching valve, that is, the rotation speed of the hydraulic motor 38 for driving the hydraulic switching valve. Varies depending on the amount of pressure oil supplied. While applying vibration to the pile head with the vibratory pile driver, the vibratory pile driver is lowered to drive the pile. The vibration pile driver is lowered by loosening the hanging rope of a crane, etc.

When pulling out a pile, the vibratory pile driver is hoisted up while applying vibration to the pile head in the same manner as described above, and the pile is pulled out.

By adjusting the frequency of vibrations applied to the pile head during pile driving and pulling out sufficiently high such that the vibrations cause longitudinal elastic resonance vibrations in the pile, an extremely efficient pile driving machine ( (generally referred to as a resonant pile driving method), the vibratory pile driving machine of this embodiment can adjust its frequency over a very wide range by simply adjusting the amount of oil supplied to the hose 75. Therefore, it can be used in the resonant pile driving method.

In addition, when driving and pulling out piles under high vibration frequencies, the vibratory pile driver is exposed to strong vibrations. A hydraulic motor 38 for rotationally driving this hydraulic switching valve 13 is disposed in the vibration reaction member 2, and oil passages 48, 49, 46, which are connected to the double-acting hydraulic cylinder, the hydraulic switching valve 13, and the hydraulic motor 38, 47,50,5
Since it has an extremely simple structure in which the vibration reaction force member 1 is bored into the vibration reaction force member 2, it has high durability against vibration.

The vibratory pile driver according to the present invention, which is constructed and operates as described above, has a large-mass vibration reaction member that is required to effectively vibrate the pile with the vibrations generated by the vibratory pile driver. By making effective use of this method and simplifying its structure, a durable vibratory pile driver can be obtained, and its effects are extremely significant. Further, there is an effect that the double-acting hydraulic cylinder, the hydraulic switching valve 13, and the hydraulic motor 38 are protected from external physical damage by the vibration reaction member 2.

In the above embodiment, the gripping portion 59 of the coupling device 53 is configured to be tiltable around the shaft 58 by the hydraulic cylinder 64, but this is because the head portion is attached to the gripping portion 59. This is to adjust the hydraulic cylinder 64 to match the vibration direction of the vibratory pile driver with the axial direction of the pile so that the vibration generated by the vibratory pile driver is effectively transmitted to the pile.

Further, in the above embodiment, the vibration reaction member 2
Although the cylinder member 1 is inserted therein to form a double-acting hydraulic cylinder, it goes without saying that the vibration reaction force member 2 may be directly used as the cylinder of the double-acting hydraulic cylinder.

In the above embodiment, the cylinder member 1 was inserted into the vibration reaction member 2 when forming the cylinder of the double-acting hydraulic cylinder, but the vibration reaction member 2
Of course, it may also be used directly as a cylinder of a double-acting hydraulic cylinder.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the vibratory pile driving method of the present invention.
FIG. 2 is a sectional view taken along the line AA in FIG. 1. Both oil chambers of the double acting hydraulic cylinder; 8 and 9, hydraulic switching valve; 13, piston rod of the double acting hydraulic cylinder; 5, coupling device; 53, vibration reaction member; 2, high pressure oil path; 46, tank oil path; 47, oil passage; 48 and 49.

Claims (1)

[Claims] 1 A rotary hydraulic switching valve that is interposed between a double-acting hydraulic cylinder, a pair of oil passages that communicate with both oil chambers of the double-acting hydraulic cylinder, a high-pressure oil passage, and a tank oil passage, and that is connected to a hydraulic motor. Therefore, the rotary type is driven to rotate and alternately supplies hydraulic oil from the high-pressure oil passage to both oil chambers of a double-acting hydraulic cylinder in proportion to the rotation speed, and alternately discharges hydraulic oil from both oil chambers to the tank oil passage. A vibratory pile driving machine comprising a hydraulic switching valve and a connecting device disposed at the tip of a piston rod of a plurality of hydraulic cylinders to removably hold a pile head, the double-acting hydraulic cylinder having a large mass. The hydraulic switching valve and the hydraulic motor for rotationally driving the hydraulic switching valve are installed in the vibration reaction member, and one end is connected to the vibration reaction member. A high-pressure oil passage that opens to the outside of the vibration reaction member and the other end reaches the hydraulic switching valve, a tank oil passage that opens to the outside of the vibration reaction member and the other end reaches the hydraulic switching valve, and both sides of the double-acting hydraulic cylinder. A vibratory pile driving machine characterized by being provided with a pair of oil passages connecting an oil chamber and a hydraulic switching valve, and an oil supply and drainage passage to a hydraulic motor.