JP2659495B2 - Hydraulic vibration pile driving device - Google Patents

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, to preventing a rotation of a piston rod of a vibrating cylinder device without impairing a vibrating function. The present invention relates to a hydraulic vibration pile driving device.

[0002]

2. Description of the Related Art Pile driving devices include a vibration pile driving device, an impact pile driving device, and a press-fitting pile driving device. However, the vibration pile driving device is awarded because it is relatively quiet and has high efficiency. ing.

[0003] Excitation mechanisms of a vibrating pile driving device can be roughly classified in principle into an eccentric weight type and a reciprocating piston cylinder type, each having a length.

A state-of-the-art pile driving apparatus having a reciprocating piston cylinder type vibration mechanism is disclosed in Japanese Patent Publication No. 58-46963.

In the pile driving device according to the above-mentioned known technique, a vibration cylinder and a positioning cylinder are incorporated inside an inertial weight such that the axis of a rod is located on a center line passing through the center of gravity of the inertia weight. A switching valve for supplying and discharging the pressurized fluid is provided to the vibration cylinder, and the localization cylinder is moved into the control chamber in the localization cylinder in response to the rod of either the localization cylinder or the vibration cylinder. A responsive control valve for supplying and discharging pressure fluid is provided, and the piston of the positioning cylinder is provided to the inertial 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 positioning cylinder. A chuck that is supported with low rigidity and grips the pile at the lower end of the rod of the stereotactic cylinder or vibration cylinder is provided. , 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 prior art are rotatable 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 determined.

In a normal hydraulic cylinder device, since both the inner periphery of the cylinder member and the outer periphery of the piston are cylindrical surfaces, they can rotate relative to each other. Many means are known and used as means for locking the relative rotation.

However, in a vibrating cylinder device used for a pile driver, the piston and the piston rod move up and down at a relatively high cycle (for example, 20 to 60 Hz). Special measures are required to stop the rotation of the piston rod.

As a measure for solving such a technical problem, Japanese Patent Laid-Open Publication No. Sho 61-72121 proposes "a device for preventing piston rotation in a hydraulic pile driver".

[0010] The structure of the rotation preventing device comprises a cylinder,
In a hydraulic pile driver having a piston rod mounted on the cylinder so as to be able to move up and down and vibrating up and down by the supply of pressure oil, and a pile clamping device attached to the lower end of the piston rod, a hydraulic cylinder between the cylinder and the pile clamping device An elastic member is interposed between the elastic members, the pile holding device is supported by the shear force of the elastic member, and the rotational force of the piston is received by the compressive force of the elastic member.

According to the above publication, the apparatus for preventing rotation of the piston in the hydraulic pile driving machine has an elastic body interposed between the cylinder and the pile holding device, and supports the pile holding device by the shearing force of the elastic body. Since the rotational force of the piston is received by the compressive 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.

Further, by supporting the pile holding device with an elastic body, the weight of the pile holding device can be reduced by the spring constant of the elastic body. As a result, it is recommended that the amplitude is increased by an amount corresponding to the reduced weight of the pile holding device, and the pile driving capability is improved.

In this prior art, the expression "supporting a pile clamping device (pile chuck) by the shearing force of an elastic body" seems to be an erroneous definition of the term "shearing force". Inferring from the description in the detailed description of the invention disclosed in the official gazette, the meaning of "support in a form that generates a shear force on the elastic body", that is, "support by a reaction force of the shear force" I can understand.

[0014]

In the above prior art, the piston and the piston rod of the vibrating hydraulic cylinder device are fitted concentrically to the cylinder member,
It is moved up and down by the hydraulic pressure, and its up and down stroke is naturally determined.

Therefore, as described in the aforementioned "Piston Rotation Prevention Device in Hydraulic Pile Driver" (Japanese Patent Laid-Open No. 61-72121), unless the pile chuck is supported by the shearing force of the elastic body, This is not to say that support is not given. Inferring from the description in the detailed description of the publication, the present invention (Japanese Patent Application Laid-Open No. 61-72121) discloses that a 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 it is trying to give a pulling force.

However, the driving of a pile requires a huge force of at least a ton unit, although it depends on the shape and size of the pile and the hardness of the ground.

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

The present invention has been made in view of the above-mentioned circumstances, and there is no danger of causing early fatigue by repeatedly applying a shearing load to an elastic body, and furthermore, for a pile mounted on a piston rod of a vibration cylinder device. An object of the present invention is to provide a hydraulic vibratory pile driving device capable of restricting a rotation angle position of a chuck.

[0019]

In order to achieve the above object, the present invention provides a vibrating cylinder device which is suspended with its axis centered vertically and which reciprocates a piston and a piston rod by hydraulic pressure. In a hydraulic vibratory pile driving device having a pile chuck mounted on a lower end of a piston rod, the hydraulic vibratory pile driving device is fixed to a cylinder member of the vibrating cylinder device and surrounds a periphery of an upper end of the pile chuck. It is characterized by comprising a cylindrical skirt member, and at least two wire ropes stretched substantially horizontally between the pile chuck and the cylindrical skirt member.

In practicing the present invention, the cylindrical skirt member has a rectangular cylindrical shape, and has a rectangular frame-like flange for attaching and fixing the cylindrical skirt member to the cylinder member. When the structure is made such that it can be attached to and detached from the cylinder member and can be rotated by 90 degrees around the vertical axis with the attachment and detachment, the gripping posture of the pile gripped by the pile chuck is rotated by 90 degrees. Operation becomes easy.

[0021]

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

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

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

[0024]

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

Reference numeral 1 denotes a suspension device, which has a suspension ring 1b fixed to the top surface of a cylindrical suspension device 1a having a bottom and a bottom, which covers an inertial weight 2 and a vibrating cylinder device 3 installed below the inertial weight 2. I have.

An inertial weight 2 is mounted in the suspension device main body 1a via a buffer rubber 1c.

The vibrating cylinder device 3 includes a positioning cylinder 3a.
-1 and a cylinder member 3a in which a vibration cylinder 3a-2 is formed are fixed vertically to the bottom surface of the inertial weight 2 with the axis of the cylinder member 3a formed therein. It is stored.

The lower end of the piston rod 3d projects below the cylinder member 3a.
Is attached.

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

The skirt 5 of this embodiment is a square tube,
At its upper end, a square frame-shaped flange 5a is provided. The cylindrical skirt 5 has the flange 5a fixed to the cylinder member 3a by a mounting bolt 6 via a bracket 3e.

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

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

A known technique may be arbitrarily selected as a method of attaching the wire rope to the bracket. In this example, pin connection was used for easy attachment.

By extending at least two wire ropes 7, 7 'substantially horizontally as in this embodiment, 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 is moved up and down (FIG. 2).
(In the direction perpendicular to the paper surface) with a stroke of about 10 mm is not prevented.

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

In the case where a large number of piles are driven in line along a straight line according to the construction design document, it is very important that the pile chuck 4 can be turned 90 degrees as described above when approaching a corner. It is convenient.

According to the present embodiment, the attachment and detachment of the mounting bolt 6 for attaching the flange 5a of the skirt and the skirt 5 without directly touching the pile chuck 4 and the wire rope 7.
By the rotation operation, the direction of the pile chuck 4, that is, the direction of the pile gripped by the pile chuck can be turned by 90 degrees.

In the embodiment shown in FIG. 1, a cylindrical lifting device main body 1a having a bottom and a bottom covers the inertial weight 2 and the vibrating cylinder device 3, and a cylindrical skirt 5 serves as a pile chuck. 4 covers the periphery of the upper end, so that the sound insulation effect is much better than in the conventional example.

[0040]

As described above, a vibrating cylinder device suspended vertically with its axis centered and reciprocating a piston and a piston rod by hydraulic pressure, and a pile cylinder mounted on the lower end of the piston rod The present invention is applied to a hydraulic vibratory pile driving device having a chuck and a cylindrical skirt member fixed to a cylinder member of the vibration cylinder device and surrounding a periphery of an upper end of the pile chuck. And at least two wire ropes stretched substantially horizontally between the pile chuck and the tubular skirt member, to repeatedly apply a shear load to the elastic member to promote early fatigue. There is an excellent practical effect that the rotation angle position of the pile chuck attached to the piston rod of the vibration cylinder device can be regulated without fear.

In practicing the present invention, the cylindrical skirt member has a rectangular cylindrical shape and has a rectangular frame-like flange for fixing the cylindrical skirt member to the cylinder member. The structure is such that it can be attached to and detached from the cylinder member and can be rotated 90 degrees around the vertical axis with the attachment and detachment. This is convenient because it can be turned 90 degrees quickly and reliably.

[Brief description of the drawings]

FIG. 1 is a vertical longitudinal sectional view showing one 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 sectional view for explaining a method of use and an effect of the embodiment.

[Description of Signs] 1 Suspension device 1a Suspension device main body 1b Suspension ring 1c Buffer rubber 2 Inertial weight 3 Exciting cylinder device 3a Cylinder member 3a-1 Orientation 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)

(57) [Claims] A hydraulic cylinder having a vibrating cylinder device suspended vertically with its axis centered and reciprocating a piston and a piston rod by hydraulic pressure, and a pile chuck mounted on a lower end portion of the piston rod. In the vibration-driven pile driving device, a cylindrical skirt member fixed to a cylinder member of the vibration cylinder device and surrounding a periphery of an upper end portion of the pile chuck, the pile chuck and the cylindrical skirt member And at least two wire ropes stretched substantially horizontally between the hydraulic vibration pile driving device and the hydraulic pile driving device. 2. The cylindrical skirt member has a rectangular cylindrical shape, and has a rectangular frame-shaped flange for mounting and fixing the cylindrical skirt member to a cylinder member. The hydraulic vibratory pile driving device according to claim 1, wherein the hydraulic vibrating pile driving device has a structure capable of being attached to / detached from a member and rotated by 90 degrees around a vertical axis with the attachment / detachment.