JPH06101228A - Hydraulic vibratory pile driver - Google Patents

Abstract

PURPOSE:To prevent a pile chuck mounted to a piston rod of a cylinder device from turning to a body of the cylinder device in a hydraulic vibratory pile driver having a vibrating cylinder device and the pile chuck. CONSTITUTION:A guide member 7 having a vertical groove and a rubber ball 8 are provided between a cylindrical skirt 5 connected to a vibrating cylinder device fixedly and a pile chuck 4. The turning of the pile chuck is prevented by the rubber ball 8, and an up-and-down motion of the pile chuck is absorbed by rolling of the rubber ball 8.

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 vibrating 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 the 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 placed 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 inside the positioning cylinder in response to the rod of either 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 inertial weight by compression of the pressure fluid in the control chamber or by an accumulator installed 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 gripping 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, both 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. Many means are publicly known as means for locking the 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 at a relatively high cycle (for example, 20 to 60 Hz), the vertical vibration 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 anti-rotation device comprises a cylinder,
In a hydraulic pile driver equipped with a piston rod that is vertically movable in the cylinder and vibrates up and down 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 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 preventing device in this hydraulic pile driving machine 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. Moreover, 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 disturbing 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 by the reduced weight, 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 in the column of the detailed description of the invention disclosed in the gazette, it means that "the bearing is supported in a form that causes a shearing force in the elastic body", that is, "the bearing is supported by the reaction force of the shearing force". Can be understood.

[0014]

In the above 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 naturally determined.

Therefore, as described in "Piston Rotation Prevention Device in 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 contents 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 it is trying to give pulling force.

However, 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 indicated by 121), when a shear load is applied to the elastic body while vibrating it, 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 shearing 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 in which a shaft and a piston rod are reciprocally moved up and down by hydraulic pressure. In the hydraulic vibrating pile driving device including a pile chuck attached to the lower end portion of the piston rod, the hydraulic vibration pile driving device is fixed to the cylinder member of the vibration cylinder device and surrounds the upper end portion of the pile chuck. A tubular skirt member, a spherical member having rubber elasticity interposed between the pile chuck and the skirt member, and provided on at least one of the pile chuck and the skirt member, Vertical grooves for guiding the spherical member, and stopper means provided at the upper and lower ends of the groove for abutting against the spherical member to prevent its rolling. Characterized in that it comprises.

[0020]

According to the above configuration, a. When the pile chuck tries to rotate around the vertical axis with respect to the vibration cylinder, the spherical member having rubber elasticity prevents the above rotation.

B. When the vibration cylinder is vibrated up and down with respect to the pile chuck, the spherical member having rubber elasticity rolls up and down and does not hinder the vibration.

C. When the vibrating cylinder is lowered with respect to the pile chuck and the spherical member having rubber elasticity is pressed against the stopper, the weight of the vibrating cylinder and the rigid member integrally connected to the vibrating cylinder is reduced by the spherical member. The load can be applied to the pile chuck via the auxiliary to assist the driving ability of the pile.

D. Similarly, when the vibration cylinder is lifted up by a crane and lifted and the spherical member having rubber elasticity is pressed against the stopper, the lifting force of the vibration cylinder is transmitted to the pile chuck through the spherical member, Assists withdrawal ability.

In the cases of c and d, the spherical member having rubber elasticity is sandwiched between the stoppers and compressed, and the driving force or the pulling force is transmitted to the pile by the compression reaction force, but the spherical member is subjected to the shearing force. There is no. Therefore, there is no possibility that a member having rubber elasticity is subjected to shearing force and is damaged, deteriorated or broken at an early stage.

[0025]

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, and a suspension ring 1b is fixed on the top surface of a main body 1a of a cylindrical suspension device having a bottomless top and 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 suspension device main body 1a through 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 axial 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 the flange 5a by a mounting bolt 6 via a bracket 3e.

A guide member 7 having a vertical guide groove is provided on the surface of the pile chuck 4 near the upper end, which faces the skirt 5, and a rubber-like elastic member is provided between the guide member and the skirt. A spherical member (abbreviated as a rubber ball) 8 having is interposed.

FIG. 2 shows a cross section taken along the line AA of FIG.

Since the guide member 7 is provided in the vertical direction, its horizontal cross section appears in this horizontal cross section (FIG. 2).

As can be easily understood from this figure, when the pile chuck 4 tries to rotate around the vertical axis (perpendicular to the paper surface in this figure) with respect to the tubular skirt 5, the rubber ball 8 rotates. Block.

The BB cross section shown in FIG. 2 is shown in FIG.

The guide member 7 is fixed to the pile chuck 4 in a vertical posture, and is provided with a cylindrical groove 7a for guiding the rubber ball 8.

A rubber ball 8 is provided at the upper end of the groove 7a.
And a stopper 7b having a spherical shape of 1/4 that abuts against and locks the rolling. The rounded-up portion at the lower end of the groove 7a forms a stopper 7c.

As shown in FIG. 2, when the rubber ball 8 is located near the center of the guide member 7, the stopper 9a is fixed to the cylindrical skirt 5 so as to face the stopper surface and the stopper surface 7c is formed. The stopper 9b
Is fixed to the tubular skirt 5.

When the vibrating cylinder device 3 shown in FIG. 1 is operated to carry out a pile driving work or a pile pulling work, FIG.
3 and FIG. 3, the pile chuck 4 has a vertical stroke with respect to the tubular skirt 5 (for example, 10 m).
vibrate at m).

At this time, the rubber ball 8 is sandwiched between the pile chuck 4 and the tubular skirt 5, and rolls at a stroke of about 1/2 of the above-mentioned predetermined stroke to reciprocate up and down.

In this operation, the rubber ball 8 only rolls up and down by frictional transmission and does not receive any additional shearing force.

Therefore, there is no risk of material fatigue or premature breakage due to shearing force during operation.

When performing a pile driving work stronger than the state shown in FIG. 3, the chuck 4 for piles more than the state shown in FIG.
And raise the rubber ball 8 between the stopper surface 7c of the guide member 7 and the stopper 9a as shown in FIG.
In this state, vertical vibration is applied to the pile chuck 4.

The clamping force of the rubber ball 8 by the stopper surface 7c and the stopper 9a acts in the direction of the line of action 10, and the vertical component force f of the reaction force F acts in the direction of driving the pile.

When a load is applied to the pile chuck 4 through the rubber balls 8 in this manner, the rubber balls 8 receive a compressive force in the direction of the action line 10 and do not receive a shearing force. Therefore, the problem that the rubber ball fatigues early due to the shearing force does not occur.

When performing a pulling-out work that is stronger than the state shown in FIG. 3, the pile chuck 4 is made stronger than in the state shown in FIG.
And lower the rubber ball 8 between the stopper surface 7b of the guide member 7 and the stopper 9b as shown in FIG.
In this state, vertical vibration is applied to the pile chuck 4.

The clamping force of the rubber ball 8 by the stopper surface 7b and the stopper 9b acts in the direction of the line of action 10 ', and the vertical component force f'of the reaction force F'acts in the direction of driving the pile.

In this way, when a load is applied to the pile chuck 4 via the rubber balls 8, the rubber balls 8 receive a compressive force in the direction of the line of action 10 ', but no shearing force. Therefore, the problem that the rubber ball fatigues early due to the shearing force does not occur.

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, if the pile chucks 4 can be turned 90 degrees when approaching a corner as described above, it is very possible. It is convenient.

According to this embodiment, without directly touching the pile chuck 4, the direction of the pile chuck 4 can be changed by attaching / detaching the mounting bolt 6 attaching the flange 5a of the skirt and rotating the skirt 5. That is, the direction of the pile gripped by the pile chuck can be turned 90 degrees.

In the embodiment shown in FIG. 1, the bottomless cylindrical suspension device main body 1a covers the inertia weight 2 and the vibrating cylinder device 3 and the cylindrical skirt 5 is 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.

In this embodiment, as shown in FIG.
Although the rubber balls 8 and the four guide members 7 are used in FIG.
It is also possible to prevent the pile chuck 4 from rotating with three rubber balls 8 and three guide members as shown in FIG.

Although the guide member 7 is fixed to the pile chuck 4 in the above embodiment, the same action and effect can be obtained by fixing the guide member 7 to the cylindrical skirt 5 as shown in FIG. To be

FIG. 9 shows a further different embodiment, in which the guide member 7 is fixed so as to face both the pile chuck 4 and the tubular skirt 5, and the rubber ball 8 is interposed therebetween.

When the structure in which one rubber ball 8 is sandwiched by the two guide members 7 is provided in this manner, at least, as shown in FIG. 10, the pile is formed by the two rubber balls 8 and the four guide members 7. It is possible to prevent the chuck 4 for rotation from rotating.

[0058]

As described above, the vibrating cylinder device is mounted on the lower end of the above-mentioned piston rod, and the vibration cylinder device which is suspended with the axis centered vertically and reciprocates the piston and the piston rod up and down by hydraulic pressure. The present invention is applied to a hydraulic vibrating pile driving device including a pile chuck, which is fixed to a cylinder member of the vibration cylinder device and has a cylindrical shape surrounding the upper end of the pile chuck. A skirt member, a spherical member having rubber elasticity interposed between the pile chuck and the skirt member, and a spherical member provided on at least one of the pile chuck and the skirt member. When the vertical groove and the stopper means provided at the upper and lower ends of the groove for abutting against the spherical member to prevent its rolling are provided, the elastic member repeats itself. Without possibility of advancing early fatigue giving shear loads, it exhibits an excellent practical effect that it is possible to restrict the rotation angle position of the pile chuck attached to the piston rod of the vibrating cylinder device.

[Brief description of drawings]

FIG. 1 is a vertical vertical cross-sectional view showing an embodiment of a hydraulic vibrating 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 likewise a sectional view taken along line BB.

FIG. 4 is an explanatory diagram of an operation and an effect in the above embodiment.

FIG. 5 is an explanatory diagram of the operation and effect in the embodiment.

FIG. 6 is an explanatory view of the operation and effect in the above embodiment.

FIG. 7 is a sectional view of an embodiment different from the above.

FIG. 8 is a sectional view of an embodiment different from the above.

FIG. 9 is a sectional view of an embodiment different from the above.

FIG. 10 is a sectional view of an embodiment different from the above.

[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 Piston 3c Piston 3d Piston Rod 3e Bracket 4 Pile Chuck 5 Cylindrical Skirt 5a Flange 6 Mounting bolt 7 Guide member 8 Rubber ball

Claims (1)

[Claims] 1. A vibrating cylinder device for suspending a piston and a piston rod to reciprocate vertically by hydraulic pressure and having a shaft centered vertically, and a pile chuck attached to a lower end portion of the piston rod. In a hydraulic vibrating pile driving device, a cylindrical skirt member fixed to the cylinder member of the vibration cylinder device and surrounding the upper end of the pile chuck, and the pile chuck and skirt member. Intervened between,
A spherical member having rubber elasticity, a vertical groove for guiding the spherical member, which is provided on at least one of the pile chuck and the skirt member, and a spherical groove provided on the upper end and the lower end of the groove. A hydraulic vibrating pile driving device, comprising: a stopper means that abuts against a member to prevent its rolling.