JPS63189522A - Pile driver - Google Patents

Abstract

PURPOSE:To make the amplitude of vibration zero during starting and stopping periods as well as to prevent the occurrence of noise by a method in which a vibro cylinder and a stationary cylinder are built in a weight to prevent the reduction of alternating vibration and the obtain driving forces without increase in the weight by the buffering effect of the stationary cylinder. CONSTITUTION:A vibro cylinder 2 and a stationary cylinder 3 are built in a weight 1 in such a way that the axis of a rod comes to the center line passing through the gravity center of the inertial weight 1, and rods 7 and 8 are set between both the cylinders 2 and 3. A switch valve 9 through which pressure fluid is supplied and discharged is provided for the cylinder 2 and a reaction cylinder valve 10 through which pressure fluid is supplied to and discharged from a control chamber 29 in response to rods 4 and 7 is provided for the cylinder 3. The piston of the cylinder 3 is supported with low rigidity by the compression of pressure fluid in the chamber 29 or by an accumulator 13 or a spring 17 in the weight 1, and a chuck 6 to grasp a pile 5 is provided for the lower end of the rod 4. A servo control valve 22 to be worked by electric signals in also used as the switch valve 9.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention utilizes a vibrating cylinder that uses fluid pressure as an energy source to generate mechanical vibrations, and is capable of driving piles into the soil by the vibrations of the vibrating cylinder. Regarding pile driving equipment.

(Prior art) Conventional piling devices using vibrating cylinders are disclosed in Japanese Patent Application No. 51-92636 and Japanese Patent Application No. 52-17361.
It is known that it is a sight. In the former method, a pile is connected to either the piston side or the cylinder side of a vibrating cylinder, an inertial weight is connected to the other side of the vibrating cylinder at a position that is in line with the pile, and a period I [1 Defeated! II'I oscillate force, set the tensile force and compressive force of this excitation force to different magnitudes, and shorten the time to apply the force with the larger value 11, and shorten the time to apply the force with the smaller value. It is made long and the stakes are driven into it. In the latter, in addition to the inertial weight, a static load weight is provided via a spring on the chuck side that grips the pile to increase the driving force into the pile.

(Problems to be solved) In both conventional examples, soundproofing measures are still insufficient, and it is difficult to apply downward force due to other construction equipment (crane trucks, leaders, etc.). In both cases, the amount of machine 7!! cannot be avoided.Furthermore, in both cases, the amplitude cannot be reduced to zero when starting and stopping the pile driver.

The present invention consists of 1. It was invented in view of the current situation,
It has a soundproof structure, allows for lowering and upper pulling by other construction machinery without reducing the alternating excitation force of the vibrating cylinder, and has sufficient pile driving force without increasing the "machine use". It is an object of the present invention to provide a pile driving device that can reduce the amplitude to zero when starting and stopping.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes a vibration cylinder and a positioning cylinder built into an inertial weight such that the axis of the rod is on a center line passing through the center of gravity of the inertial weight, and a vibration cylinder and a positioning cylinder are connected to each other. A rod is disposed between them, and a switching valve is provided for supplying and discharging pressure fluid to and from the vibration cylinder.
A responsive control valve is provided for supplying and discharging pressure fluid into the chamber, and the piston of the positioning cylinder is connected to the inertia weight by compression of the pressure fluid in the IJu chamber, or by an accumulator provided in communication with the υ control chamber, or provided within the positioning cylinder. The rod is supported with low rigidity by a fixed spring, and a chuck that grips the pile is provided at the lower end of the rod of the stereotactic cylinder or vibration cylinder.
A servo l1l-valve operated by an electric signal is used as the switching valve.

[Effect]

When driving a pile into the soil, the chuck is used to hold the pile in the ground, and the imaging cylinder is set in the chuck to transmit the alternating excitation force as a reaction force due to the purulent effect of the inertial weight to the pile, and further as a static load. If the entire weight of the inertial weight and the inertial weight are pulled downward by a pulling device such as a winch, the pulling force can be transmitted to the pile. At this time, the acceleration force of the vibrating cylinder is transmitted to the pile without being reduced, so that the weight of the inertial weight, the downward pulling force, and the alternating excitation force by the vibrating cylinder are superimposed during construction.

Also, servo as a switching valve! By using the II m valve, the amplitude can be made variable, and the amplitude is reduced to zero when starting and stopping the pile driving equipment, so that no shock is given to the crane vehicle, etc.

('X IF1) Preferred embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, an inertial weight 1 is constructed with a wall thickness sufficient for soundproofing, and a vibration cylinder 2 is installed inside this inertial weight 1.
and a positioning cylinder 3 are assembled, and a chuck 6 for gripping a stake 5 is attached to a rod 4 projecting downward from within the inertia weight 1 of the positioning cylinder 3. The cylinders 2 and 3 are arranged in series so that the axes of the rods 4 and 8 are on a center line passing through the center of gravity of the inertial weight 1. Further, the other rod 7 of the stereotactic cylinder 3 and the rod 8 of the vibration cylinder 2 are butted against each other for convenience of manufacture, and have an integral structure. The vibration cylinder 2 is provided with a switching valve 9 for generating an alternating excitation force.

The positioning cylinder 3 is provided with a positioning cylinder 3 in response to the rod 8 of the vibration cylinder 2 or the rod 7 of the positioning cylinder 3.
A response control valve 10 is provided for supplying and discharging pressure fluid to and from the engine. In FIG. 1, each oil chamber 1 of the stereotactic cylinder 3 is
Accumulators 13.13 are provided in communication with the 7 accumulators 13.13, and the vertical vibration of the piston 14 of the stereotactic cylinder 3 is not transmitted to the inertial weight 1 by the spring effect caused by the volume change of these 7 accumulators 13.13. In order to prevent a decrease in the cross 1711 force, the inertial weight 1 and the piston 14 of the positioning cylinder 3 are connected softly (with low rigidity). This is because the vibration of the piston 14 caused by the vibrating cylinder 2 is suppressed (that is, the pile driving force is reduced) by supporting the inertial weight 1 and the piston 14 with high rigidity via a relatively incompressible pressure fluid.
This is to avoid. Such an accumulator 13.
If the vibration amplitude by the vibration cylinder 2 is within ±21-2, the stiffness of the spring effect by the vibration cylinder 2 is desirably set to 20-1 or more with respect to the maximum excitation force of the vibration cylinder 2.

Such a spring effect of the positioning cylinder 3 can also be achieved with a structure as shown in FIG. That is, in FIG. 2, floating pistons 15.16 are provided on both sides of the piston 14 by being fitted into the rods 4 and 7, and a spring 17 is interposed between the floating pistons 15.16 and the piston 14. It has a similar structure.

As the switching valve 9, a servo control valve operated by an electric signal is used as shown in FIG.

This switching valve 9 has a spool 1 in the cylinder block 18.
This spool 19 is equipped with a four-way guide valve 20 that accommodates a
Detects spool displacement of axis 19A! 121, the spool 19 is driven by a small electro-hydraulic servo valve 22, which converts the position of the spool 19 into an electrical signal and feeds it back to the differential amplifier 23.
It is configured to move in accordance with a command signal applied to 11t23.

In the Wi3 figure, numeral 24 is a pressure oil boat, and numeral 25 is a return boat. The ports 26 and 27 also communicate with the vibration cylinder 2. Depending on the position of the spool 19, the flow direction and flow rate of the pressure oil to the vibration cylinder 2 can be adjusted.

As the vibration cylinder 2, those described in the specifications and drawings of Japanese Patent Application No. 51-92636 and Japanese Patent Application No. 1111152-17361M can be used.

The configuration of the stereotactic cylinder 3 is as shown in FIG.
The piston 14 is located near the lowermost end of the cylinder body 28, and the control oil chamber 29 on the side of the fixed pressure receiving surface A1 of the piston 14 is set to the bias pressure receiving pressure 1iA of the piston 14? The oil passage 31, which is formed significantly larger than the side oil N30 and communicates with the control oil chamber 29, is in the cylinder body 28! /l A response to supply and discharge pressure oil to and from the control oil chamber 29 via this oil passage 31! A II-III valve 10 is provided. This ToIIJw valve 10 is a three-way switching valve using a spool, and is fixed to the rod 7. The coupling member 35 responds to the vibration cylinder 2 by transmitting the displacement of the piston of the vibration cylinder 2 to the spool 36. This valve 10 includes an oil passage 32 passing through the oil chamber 30 and leading to the supply port P, an oil passage 31 leading to the oil passage 31, and an oil passage 3 leading to the discharge port T.
It is designed to switch in three directions. In addition, 34 in the figure
is a filter. Further, the oil passage 37 communicates with an oil chamber 38 of the vibration cylinder 2, and the oil passage 39 communicates with another oil chamber of the vibration cylinder 2.

In the embodiment shown in FIG. 5, the switching valve 9 is brought out from inside the vibration cylinder 2, the vertical relationship between the localization cylinder 3 and the cylinder 2 is switched, and the rods of each cylinder 2.3 are integrally connected. The other basic structure is the same as that of the previous embodiment. By protruding the switching valve 9 from inside the vibrating cylinder 2 to the outside, the structure of the piston 40 of the vibrating cylinder 2 is simplified, which has the advantage of significantly reducing manufacturing costs, especially in the case of a large cylinder.
Furthermore, as another example, the one shown in FIGS. 6 and 7 will be described. This embodiment is equipped with a suspension M50. The hanging device 50 includes a hook 51 that is attached to a crane or the like, and a hanging device main body 52 that is supported by the hook 51 and has a U-shaped cross section. The inertia weight 1 is attached to the suspension main body 52, and an Ill rubber 53 is provided between the suspension device main body 52 and the inertia weight 1, so that the vibration of the inertia weight 1 is not directly transmitted to the suspension device main body 52. There is no such thing. The entire cylinder is made relatively thin, and a soundproof cover (skirt) 15 is formed on the outside which also serves as an inertial weight, thereby reducing the cost of the entire cylinder while providing soundproofing and protection of the valves.

(Effects) As explained above, according to the present invention, since both the vibration cylinder and the positioning cylinder are incorporated in the inertial weight, it is possible to prevent the vibration lIH sound of both cylinders from propagating to the surroundings. . In particular, in the present invention, in addition to the operating element that varies the frequency, an operating element that varies the amplitude, that is, an amplitude variable operating element by using a servo control valve as a switching valve, is added, so that the operation element can be operated independently of the frequency. The amplitude of the pile can be controlled from zero to maximum. With this, by reducing the amplitude to zero when starting and stopping the pile driving machine, it is possible to eliminate the liability for shocks to the crane, etc.

In addition, by varying the amplitude of anti-vibration, in order to reduce pollution such as ground vibration in complex ground, the amplitude is increased only when it is difficult to penetrate, and when penetrating smoothly, 1 width is reduced to the minimum necessary. etc. Furthermore, since the opening and closing of the switching valve can be made to follow the electrical signal waveform, it is possible to perform not only simple sine wave switching but also rectangular wave switching, which rapidly changes the pressure inside the TxwJ cylinder during pile driving, The effect can also improve your driving ability. Furthermore, by making the opening/opening area of the switching valve sinusoidal, high WJ included in the vibration waveform can be achieved.
The wave component can be reduced, and thereby the j&I7'+ generated from chucks and piles can also be reduced. In experiments, it was possible to attenuate by up to 10 dB.

Both cylinders are installed in series so that the axis of each rod is on the center line passing through the center of gravity of the inertial weight, and operates in response to the rod of the vibration cylinder, and supplies pressure fluid to the control chamber of the stereotactic cylinder. A responsive control valve for supplying and discharging is provided, and the piston of the positioning cylinder is connected to an inertial weight by the compressibility of the pressure fluid in the &lI III chamber, by an accumulator provided in communication with the υ control chamber, or by a spring provided in the cylinder. Since it is supported with low rigidity, the piston of the positioning cylinder is positioned at a fixed position within the inertial weight and has a damping effect. As a result, the vibrating cylinder is prevented from reducing the alternating excitation force due to displacement of the piston of the orienting cylinder. Further, due to the buffering effect of the positioning cylinder, the weight of the inertial weight is transmitted to the pile without being reduced, and the pile driving force becomes sufficient. In particular, when a downward pulling force or an upward pulling force is applied to an inertial weight by a construction machine, the downward pulling force or upward pulling force and the excitation force cancel each other out without transmitting @ ribs to the lower pulling device or the upper pulling device. In general, according to the present invention, the soundproof structure allows the alternating excitation force of the vibrating cylinder to be transmitted to the pile without reduction, and to reduce the lowering force. Since force or upward pulling force can also be applied, there are advantages such as no need to increase the weight of the machine.

[Brief explanation of the drawing]

Figure m1 is the original Ml@composition diagram of the present invention, Figure 2 is a simplified sectional view showing a modification of the stereotactic cylinder, Figure 3 is a simplified sectional view showing the switching valve, Figure 4 is a sectional view of the positioning cylinder part, 5 is a sectional view of another embodiment, FIG. 6 is a sectional view of still another embodiment, and FIG. 7 is a partially enlarged sectional view of FIG. 6. 1...Inertia weight, 2...Vibration cylinder, 3...Localization cylinder, 4.7.8...Rod, 5...Pile, 6...Chuck, 9...Switching valve, DESCRIPTION OF SYMBOLS 10... Response III control valve, 13... Accumulator, 17... Spring, 29... Control room (control oil chamber). Applicant Takahashi Engineering Co., Ltd. Agent Patent Attorney Masu 1) Takeo Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A vibration cylinder and a positioning cylinder are installed inside the inertial weight so that the axis of the rod is on a center line passing through the center of gravity of the inertial weight, and a rod is installed between the vibration cylinder and the positioning cylinder. A switching valve is provided for supplying and discharging pressure fluid to the vibration cylinder, and a switching valve is provided for supplying and discharging pressure fluid into the control chamber in the positioning cylinder in response to a rod of either the positioning cylinder or the vibration cylinder. A responsive control valve is provided, in which the piston of the stereotactic cylinder is supported by an inertial weight with low rigidity by compression of pressure fluid in the control chamber, by an accumulator provided in communication with the control chamber, or by a spring provided in the stereotactic cylinder, A pile driving device, characterized in that a chuck for gripping a pile is provided at the lower end of a rod of a positioning cylinder or a vibration cylinder, and a servo control valve operated by an electric signal is used as the switching valve.