JPH078578Y2 - Ground dynamic consolidation equipment - Google Patents

Description

[Detailed Description of the Invention] << Industrial field of application >> The present invention is designed to obtain sufficient support strength for soft ground by dropping a suspended weight on the ground surface to compact the ground. The present invention relates to a ground dynamic consolidation apparatus suitable for use in implementing an improved civil engineering method.

《Prior art》 Conventionally, as a device for dynamic consolidation of the ground, one in which a weight is dropped while being hung by a wire rope, and a locking tool having a weight is hung by a wire rope, It is known that the weight held by the locking tool is released from the locking tool when it is raised to a certain height, and the weight is dropped by its own weight.

<Problems to be solved by the device> However, according to the former, there is a risk of damaging the wire rope due to the impact when the weight falls, and even if a shock absorber is used there, the wire rope will be damaged from the impact. It is not possible to completely protect it, and in the latter case, the weight is removed from the locking tool by operating the wire rope, so the engagement and disengagement of the weight with respect to the locking tool is not smooth and the weight swings. However, the result is that the weight does not fall directly below the hoisting position and the position shifts, or it falls while tilting, so even if you try to connect the locking tool to the dropped weight again, this is difficult. There are problems such as

The present invention has been made in view of such problems of the above-described conventional device, and an object of the present invention is to provide, in the latter case, a device for attaching and detaching a weight, which is a method for loading and unloading a weight, when the weight is dropped. Therefore, an external force is applied to the weight inadvertently, so that the weight does not deviate from the center line of the device or incline, and it is easy to disengage the weight. The purpose is to improve the efficiency of the dynamic consolidation work on soft ground and to prevent the structural members from being damaged by the inclination of the weight.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a suspension main body that can be suspended on a wire rope for hoisting and has a taper of a weight, which is located outside the lower part and is a separate body. A plurality of chuck levers having a weight supporting surface which can be pressed against the inner wall surface of the cylindrical connecting hole in a detached state are vertically installed so that the base ends of the chuck levers can be expanded and closed, On the main body, at the lower end of the output shaft of the hydraulic cylinder that is suspended coaxially with the chuck lever, a taper key with an inverted regular triangular pyramid shape is attached.
It is an object of the present invention to provide a ground dynamic compaction device which is slidably brought into contact with each downwardly slanted surface of each chuck lever.

<Operation> The suspension main body is suspended vertically by a wire rope for hoisting suspended from the top sheave of the crane.

If the output shaft of the hydraulic cylinder is contracted when the device is lifted by a wire rope while supporting the weight and raised to a certain height, the taper key fixed to the output shaft is pulled up to the top. Each chuck lever held in the expanded state by the taper key is closed by its own weight.

Therefore, the weights supported from the inside by the weight supporting surfaces of the chuck levers are released, and the weights freely fall due to their own weight and collide with the surface of the ground to compact the ground.

Next, with the chuck levers closed as described above, the device is lowered along the axis of the weight, and the chuck levers are tapered to the axis of the weight. Insert into the connection hole.

Then, when the output shaft of the hydraulic cylinder is extended, the taper key is pushed down, so that the taper surface slides on the inclined surface of the chuck lever, whereby each chuck lever is expanded and the inner wall surface of the tapered connection hole of the weight is expanded. It is pressed.

Since an inclined weight supporting surface is provided on the outer side of the lower portion of each chuck lever, the chuck lever is fitted into the inner wall surface of the tapered connecting hole by the supporting surfaces in a wedge shape to connect the weights. Will be done.

In this state, the weight is suspended by winding the wire rope with a crane winch or the like.

Further, each chuck lever is provided so as to be uniformly expanded and closed with respect to the axis of the apparatus, and the tapered connecting hole of the weight is also provided on the axis, so that the chuck lever is When the weights are connected or released by expansion and closing of the device, the axes of the device and the weights match each other without displacement.

Therefore, after releasing the weight at a certain height and dropping it, when lowering the device so that it is connected to the weight, it is necessary to perform an alignment operation with respect to the axis of the weight. There is no.

Further, even if the taper key is lowered downward, it does not collide with the weight due to the movement within the chuck levers 5 and 6, so that an undesired external force is applied to the weight and It will not tilt.

Even if the weight is tilted by some external force, the chuck lever and the hydraulic cylinder are pivotally attached on the same axis, which is the upper part of the weight, so that an unreasonable external force is applied to the output shaft of the hydraulic cylinder. There is no need to join.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, in the suspension main body 1, a sheave 2 is rotatably supported by a support shaft 3 on an upper portion between the front and rear side plates 1a and 1b having the same shape. It is suspended by a wire rope 4 for winding which is hung on the sheave 2.

The base ends of the two chuck levers 5 and 6 are rotatably supported on the same axis by the support shaft 7 in the lower portion between the side plates 1a and 1b of the suspension main body 1. The holding body 1 is provided so as to extend equally in the radial direction with respect to the center line a of the holding body 1 and to face it so as to be able to close.

The chuck levers 5, 6 have a weight 8
The taper-shaped connecting hole 9 having a downward diameter-expansion which is formed at the center of the weight is pressed against the inner wall surface 9a so that the weight 8 has a downward diameter-expansion so that the weight 8 can be connected in a detached state. The weight supporting surfaces 5a and 6a are provided with an inclination of an equal angle, and when the chuck levers 5 and 6 are closed as shown in FIG. In order to facilitate insertion into the tapered connection hole 9 of the weight 8, on the outside of the lower ends of the chuck levers 5 and 6, opposite to the weight support surfaces 5a and 6a,
Slopes 5b and 6b having a downward diameter reduction are provided.

In addition, the upper end of the suspension main body 1 is attached to the lower end of the supporting body 1 by the support shaft 7
At the tip of the output shaft 11 hanging downward from the hydraulic cylinder 10, a hydraulic cylinder 10 rotatably supported on the same axis is erected, and a taper key 12 in the shape of an inverted regular triangular pyramid is fixed. It is set up.

The taper key 12 is located between the chuck levers 5 and 6 and is arranged so as to be movable up and down by the output shaft 11 on the center line a of the suspension main body 1.
When the output shaft 11 of 10 is extended, the taper key 12 descends, and the taper surface 12a thereof makes sliding contact with the slidable inclined surfaces 5c and 6c formed inside the chuck levers 5 and 6, whereby The chuck levers 5 and 6 in the closed state shown by the solid line in FIG. 4C are expanded in the radial direction as shown by the chain double-dashed line in FIG. The weight supporting surfaces 5a, 6a are pressed against the inner wall surface 9a of the connecting hole 9 in a wedge shape so as to be connected to the weight 8 as shown in FIGS. When the taper key 12 is raised by the reduction of 11, the chuck levers 5 and 6 are closed to release the weight 8 as shown in FIG.

On the other hand, the above-mentioned weight 8 has the above-mentioned tapered connection hole 9 formed on its axis b.

That is, the weight 8 is attached to the lower end so that the weight 8a is suspended vertically.
A tapered connecting hole 9 is formed in the upper part of the upper part so as to fit the weight supporting surfaces 5a and 6a.

As described above, the tapered connection hole 9 is formed such that the upper end opening portion has a small diameter and the lower end opening portion has a large diameter, and the inner wall surface 9a thereof has an axial center of the weight 8. They are provided at equal intervals from the line b, that is, on a virtual circumferential line centered on the axis b.

Further, a guide wall 8b for the chuck levers 5 and 6 is formed on the upper part of the weight 8 so as to expand into a substantially inverted V-shape on the front surface.

In order to use this, as illustrated in FIG. 5, the sheave 2 of the suspension main body 1 is wound around the hoisting wire rope 4 which is suspended by being wound around the top sheave 14 of the crane boom 13. Is suspended, the weight 8 is releasably connected and lifted, and when the weight 8 rises to a certain height, the output shaft 11 is contracted by operating the hydraulic cylinder 10 and the taper key
By pulling 12 up, the connection of the weight 8 by the chuck levers 5 and 6 is released, whereby the weight 8 is dropped by its own weight and the ground G is consolidated.

In FIG. 5, reference numeral 15 denotes a stay boom, which suppresses forward tilting movement of the crane boom 13 when the weight 8 is hoisted or dropped, and 16 is a hydraulic jack for expanding and contracting the horizontal stays 17, 18. Shows the main body of the crawler crane, and 20 shows the boom and depression wire rope.

<Effect of device> Since the device of the present invention is configured as described above, the plurality of chuck levers suspended from the suspension main body have the taper key arranged between them lowered or lifted by the hydraulic cylinder. By doing so, since it expands or closes equally in the radial direction, it can be pressed evenly without being biased against the inner wall surface of the tapered connection hole provided at the center of the weight. Not only when the weight is landing horizontally, but also when the weight is in an inclined state or there is a displacement between the device and the weight, and further, even when these are in a combined relative posture, The axis b of the weight can be connected and suspended without deviating from the axis a of the device, and when the weight is released and dropped, the chuck lever is lifted by the operation of the hydraulic cylinder so that the chuck lever has the same radius. By being closed in the direction and being guided by the inner wall surface of the tapered connection hole of the weight, the weight is dropped in a horizontal state along the axis a of the device, and thus, the connection of the weight The release can be performed easily and reliably in a desired state, and the reliability and efficiency of ground dynamic consolidation work can be dramatically improved.

Further, since the taper key descends from the upper position and enters the chuck lever, there is no fear of hitting the weight, and therefore the weight does not inadvertently tilt. Moreover, since both the hydraulic cylinder and the chuck lever are rotatably suspended from one axis, even if the weight is tilted, the output shaft of the hydraulic cylinder is not damaged.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a state in which weights are connected, showing an embodiment of a ground dynamic consolidation apparatus according to the present invention, FIG. 2 is a right side view of the same embodiment, and FIG. 3 is in FIG. A cross-sectional view taken along the line III-III, FIGS. 4 (a), (b), and (c) are explanatory views showing the states of lifting, releasing, and connecting the weights, respectively, in FIG. 5, and FIG. It is a front view showing one use state of the example. 1 ... Lifting body 4 ... Wire rope 5 ... Chuck lever 6 ... Chuck lever 5a ... Weight support surface 6a ... Weight support surface 5c ... Sliding inclined surface 6c ... Sliding inclined surface 8 ...... Weight 9 …… Tapered connection hole 9a …… Inner wall surface 10 …… Hydraulic cylinder 11 …… Output shaft 12 …… Taper key

Claims (1)

[Scope of utility model registration request] 1. A suspension main body which can be suspended from a wire rope for hoisting, and a weight which is outside the lower part and can be pressed against the inner wall surface of a tapered connection hole of a separate weight in a retaining state. A plurality of chuck levers having a supporting surface are vertically installed so that the base ends of the chuck levers are pivotally attached so that the chuck levers can be expanded and closed. An apparatus for dynamic consolidation of ground, wherein a taper key in the shape of an inverted regular triangular pyramid is slidably abutted on each of the downwardly slanted inclined surfaces of each chuck lever at the lower end of the output shaft of a hydraulic cylinder.