JPH05311656A - Hydraulic vibration pile driving device - Google Patents

Abstract

PURPOSE:To prevent a pile chuck fitted to the piston rod of a cylinder device from being rotated against the main body of the cylinder device in a hydraulic vibration pile driving device having the exciting cylinder device and the pile chuck. CONSTITUTION:At least two wire ropes 7 are horizontally suspended via brackets 8, 9 between a cylindrical skirt 5 stationarily fixed to an exciting cylinder device and a pile chuck 4. The rotation of the pile chuck 4 is blocked with the wire rope 7 serving as a tension rope.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic vibrating pile driving device using a vibrating cylinder device, and more particularly, it prevents the piston rod of the vibrating cylinder device from rotating without impairing the vibrating function. The present invention relates to a hydraulic vibration pile driving device.

[0002]

2. Description of the Related Art Pile driving devices include vibration piling devices, impact piling devices, press-fitting piling devices, etc., but the vibrating piling device is favored because it is relatively quiet and highly efficient. ing.

In principle, the vibrating mechanism of the vibrating pile driving device is roughly classified into an eccentric weight type and a reciprocating piston cylinder type, each of which has a length.

A technique disclosed in Japanese Patent Publication No. 58-46963 is known as a latest pile driving device having a reciprocating piston cylinder type vibration mechanism.

In the pile driving device according to the above-mentioned known technique, a vibrating cylinder and a positioning cylinder are incorporated inside the inertial weight so that the axis of the rod is on the center line passing through the center of gravity of the inertial weight. A rod is arranged between the vibration cylinder and a switching valve for supplying and discharging pressure fluid to the vibration cylinder, and the positioning cylinder moves into the control chamber in the positioning cylinder in response to either rod of the positioning cylinder or the vibration cylinder. A response control valve for supplying and discharging pressure fluid is provided, and the piston of the localization cylinder is attached to the inertia weight by compression of the pressure fluid in the control chamber or by an accumulator provided in communication with the control chamber or by a spring provided in the localization cylinder. It is supported with low rigidity, and a chuck for grasping the pile is provided at the lower end of the rod of the stereotactic cylinder or the vibration cylinder. , Are possible undercoating and upper coating by other construction machines, relatively large pile driving tool force by weight of the machinery is obtained.

However, since the piston and the piston rod in this known technique have a structure capable of rotating with respect to the cylinder member, the pile gripped by the pile chuck attached to the cylinder rod rotates around the axis. It is movable and its angular position is not fixed.

In a normal hydraulic cylinder device, the inner circumference of the cylinder member and the outer circumference of the piston are cylindrical surfaces, so they can rotate relative to each other. A large number of means are publicly known and used as means for locking this relative rotation.

However, in the vibration cylinder device used for the pile driving machine, since the piston and the piston rod move up and down in a relatively high cycle (for example, 20 to 60 Hz), the vertical vibration of the piston and the piston rod is not disturbed. Special measures are required to lock the rotation of the piston rod.

As a measure for solving such a technical problem, a "piston rotation preventing device in a hydraulic pile driver" of Japanese Patent Application Laid-Open No. 61-72121 has been proposed.

The structure of this rotation preventing device includes a cylinder,
In a hydraulic pile driver equipped with a piston rod that is vertically movable in the cylinder and vibrates vertically by the supply of pressure oil, and a pile holding device attached to the lower end of the piston rod, between the cylinder and the pile holding device. An elastic body is interposed between the pile holding device and the pile holding device supported by the shearing force of the elastic body, and the rotational force of the piston is received by the compressive force of the elastic body.

According to the above-mentioned publication, the piston rotation prevention device in this hydraulic pile driver has an elastic body interposed between the cylinder and the pile holding device, and the pile holding device is supported by the shearing force of the elastic body. In addition, since the rotational force of the piston is received by the compression force of the elastic body, the rotation of the piston rod can be prevented without hindering the vertical vibration of the piston rod.
Therefore, the pile can be driven straight.

Moreover, by supporting the pile holding device by the elastic body, the weight of the pile holding device can be reduced by the spring constant of the elastic body. As a result, the amplitude of the pile holding device is increased as much as the weight of the pile holding device is reduced, and it is recommended that the pile driving ability is improved.

In this prior art, the expression "supporting the pile holding device (pile chuck) by the shearing force of the elastic body" seems to be a mistake in the definition of the term "shearing force". Inferring from the description of the detailed description of the invention disclosed in the gazette, it is meant that "the elastic body is supported in a form in which a shearing force is generated", that is, "it is supported by the reaction force of the shearing force". Can be understood.

[0014]

In the above-mentioned prior art, the piston and the piston rod of the vibration hydraulic cylinder device are fitted concentrically with the cylinder member,
It is moved up and down by hydraulic pressure, and its up-and-down stroke is also determined by itself.

Therefore, as described in "Piston Rotation Prevention Device for Hydraulic Pile Driver" (Japanese Patent Laid-Open No. 61-72121), the pile chuck must be supported by the shearing force of the elastic body. It is not that support is not made. Inferring from the description of the detailed description of the publication, the present invention (Japanese Patent Laid-Open No. 61-72121) discloses that the pressing force is applied to the pile chuck via an elastic body interposed between the cylinder member and the pile chuck. Or it is understood that they are trying to give pulling force.

However, the pile driving requires a huge force of at least a ton unit, although there are differences depending on the shape and size of the pile and the hardness of the ground.

Therefore, the above-mentioned known technique (Japanese Patent Laid-Open No. 61-72)
As in 121), when a shear load is applied while applying vibration to the elastic body, the elastic body fatigues and breaks relatively quickly.

The present invention has been made in view of the above circumstances, and is for a pile mounted on a piston rod of a vibrating cylinder device without fear of repeatedly applying a shear load to an elastic body to promote early fatigue. An object of the present invention is to provide a hydraulic vibrating pile driving device capable of regulating the rotational angle position of a chuck.

[0019]

SUMMARY OF THE INVENTION As a structure for achieving the above object, the present invention provides a vibrating cylinder device for suspending a shaft and a piston, and reciprocally moving a piston and a piston rod by hydraulic pressure. In a hydraulic vibrating pile driving device including a pile chuck mounted on a lower end portion of a piston rod, the hydraulic vibrating pile driving device is fixed to a cylinder member of the vibration cylinder device and surrounds an upper end portion of the pile chuck. It is characterized by comprising a tubular skirt member and at least two wire ropes stretched substantially horizontally between the pile chuck and the tubular skirt member.

In carrying out the present invention, the tubular skirt member has a rectangular tubular shape, and has a rectangular frame-shaped flange for mounting and fixing the tubular skirt member to the cylinder member. If the structure is such that it can be attached to and detached from the cylinder member and can be rotated about the vertical axis by 90 degrees with attachment and detachment, the gripping posture of the pile gripped by the pile chuck is rotated by 90 degrees. Easy to operate.

[0021]

According to the above construction, the rotation angle position of the piston rod on which the pile chuck is mounted is restricted by the wire rope without interposing the elastic body.

In this case, since there are a plurality of wire ropes, it is convenient to prevent both the clockwise and counterclockwise rotations of the pile chuck.

The plurality of wire ropes act as a tension rope stretched substantially horizontally and do not prevent vertical vibration (stroke is, for example, about 10 mm) of the pile chuck.

[0024]

1 is a vertical sectional view showing an embodiment of a hydraulic vibrating pile driving apparatus according to the present invention.

The reference numeral 1 designates a suspension device, in which a suspension ring 1b is fixed to the top surface of a main body 1a of a cylindrical suspension device having a bottomless bottom, which covers the inertial weight 2 and a vibrating cylinder device 3 installed therebelow. There is.

An inertia weight 2 is attached to the inside of the hanging device main body 1a via a cushioning rubber 1c.

The vibrating cylinder device 3 is a localization cylinder 3a.
-1 and the vibrating cylinder 3a-2 are internally fixed and fixed to the bottom surface of the inertia weight 2 with the axis center of the cylinder member 3a being vertical, and the piston 3b and the piston 3c and the piston rod 3d are provided in the cylinder member 3a. It is stored.

The lower end of the piston rod 3d projects below the cylinder member 3a, and the pile chuck 4 is attached to the lower end thereof.
Is attached.

A cylindrical skirt 5 is arranged so as to surround the upper end portion (near the mounting portion) of the pile chuck 4 described above.

The skirt 5 of this example has a square tubular shape,
A square frame-shaped flange 5a is provided on the upper end thereof. The tubular skirt 5 is fixed to the cylinder member 3a with a mounting bolt 6 on the flange 5a via a bracket 3e.

A wire rope 7 is stretched almost horizontally between the tubular skirt 5 and the pile chuck 4. FIG. 2 shows a cross-sectional view of the vicinity of the wire rope 7 taken along the plane AA.

Brackets 8 and 8'on the inner surface of the skirt 5.
On the outer peripheral surface of the upper end portion of the pile chuck 4,
9'is fixed, and the wire ropes 7 and 7'are stretched between these brackets.

As a method of attaching the wire rope to the bracket, a known technique may be arbitrarily selected. In this example, pin connection is used for easy mounting.

By stretching at least two wire ropes 7, 7'substantially horizontally as in this example, the relative rotation of the pile chuck 4 with respect to the skirt 5 is restricted.

Further, as described above, the wire ropes 7, 7 '
The pile chuck 4 in the vertical direction (Fig. 2).
In the direction perpendicular to the paper surface, the vibration of about 10 mm stroke is not prevented.

When the mounting bolt 6 shown in FIG. 1 is loosened and pulled out, the tubular skirt 5 is rotated 90 degrees around the axis and fixed again with the mounting bolt 6, the pile chuck 4 in the state shown in FIG. Is rotated 90 degrees as shown in FIG.

When a large number of piles are piled up along a straight line in accordance with a construction design document, it is very useful if the pile chuck 4 can be turned 90 degrees as described above when approaching a corner. It is convenient.

According to this embodiment, without directly touching the pile chuck 4 or the wire rope 7, the attachment / detachment of the mounting bolt 6 to which the flange 5a of the skirt is attached and the skirt 5 are attached.
With the rotation operation of, the direction of the pile chuck 4, that is, the direction of the pile gripped by the pile chuck can be rotated 90 degrees.

In addition, in the embodiment shown in FIG. 1, a capless bottomed tubular suspension device main body 1a covers the inertia weight 2 and the vibrating cylinder device 3 and a tubular skirt 5 is used for the pile chuck. Since the periphery of the upper end of No. 4 is covered, the sound insulation effect is far superior to the conventional example.

[0040]

As described above, the vibrating cylinder device for suspending the shaft center vertically and reciprocating the piston and the piston rod by hydraulic pressure, and the pile mounted on the lower end portion of the piston rod. The present invention is applied to a hydraulic vibrating pile driving device including a chuck, and is a cylindrical skirt member that is fixed to a cylinder member of the vibration cylinder device and surrounds the upper end of the pile chuck. By providing at least two wire ropes stretched substantially horizontally between the pile chuck and the tubular skirt member, a repeated shear load is applied to the elastic member to promote early fatigue. This has an excellent practical effect that the turning angle position of the pile chuck attached to the piston rod of the vibration cylinder device can be regulated without fear.

Further, in carrying out the present invention, the tubular skirt member has a rectangular tubular shape, and has a rectangular frame-shaped flange for attaching and fixing the tubular skirt member to the cylinder member. However, if the structure is such that this can be attached to and detached from the cylinder member and can be rotated by 90 degrees about the vertical axis in accordance with attachment and detachment, the pivoting angle position of the pile to be gripped and driven can be easily set. It is convenient because it can be rotated 90 degrees reliably and reliably.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a hydraulic vibration pile driving device according to the present invention.

FIG. 2 is a sectional view taken along the line AA shown in FIG.

FIG. 3 is a horizontal cross-sectional view for explaining the method of use and operational effects of the above embodiment.

[Explanation of symbols]

 1 Suspension Device 1a Suspension Device Main Body 1b Suspension Ring 1c Buffer Rubber 2 Inertial Weight 3 Excitation Cylinder Device 3a Cylinder Member 3a-1 Positioning Cylinder 3a-2 Vibration Cylinder 3b, 3c Piston 3d Piston Rod 3e Bracket 4 Pile Chuck 5 Cylindrical Skirt 5a Flange 6 Mounting bolt 7,7 'Wire rope 8,8' Bracket 9,9 'Bracket

Claims (2)

[Claims] Claim: What is claimed is: 1. A hydraulic system comprising a vibrating cylinder device which is suspended with its axis centered vertically and reciprocates a piston and a piston rod by hydraulic pressure, and a pile chuck mounted on the lower end of the piston rod. In the vibrating pile driving device, a cylindrical skirt member fixed to a cylinder member of the vibration cylinder device and surrounding the upper end of the pile chuck, the pile chuck, and the cylindrical skirt member. And at least two wire ropes stretched out substantially horizontally between and, and a hydraulic type vibration pile driving device. 2. The tubular skirt member has a rectangular tubular shape, and has a rectangular frame-shaped flange for mounting and fixing the tubular skirt member to a cylinder member. The hydraulic vibrating pile driving device according to claim 1, wherein the hydraulic vibrating pile driving device has a structure capable of being attached to and detached from a member, and can be rotated by 90 degrees about a vertical axis in association with attachment and detachment.