JPS5918493B2 - Ground excavation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ground excavation method, and its purpose is to rotate a plurality of rotating vertical shafts individually and to rotate or swing a group of rotating vertical shafts as a unit. This means that the rotation or oscillation of the rotary vertical axes as a unit, the independent rotation of each rotary vertical axis during the integral rotation or oscillation of the rotary vertical axes, and the bits of adjacent rotary vertical axes. The objective is to provide a ground excavation method that can perform large-diameter excavation more efficiently through the synergistic effect of partially overlapping rotational trajectories.

The present invention will be explained in detail below with reference to Examples.

A in the figure is an excavator used in the ground excavation method of the present invention, and this excavator A has a plurality of rotating vertical shafts located on a straight line or on an intersecting straight line or at each apex point of a polygon. 1, and group drive means 4, which rotates or swings the plurality of rotary vertical shafts 1 as a unit.

FIG. 1 and FIG. 2 show an example of the vertical axis rotation means 3 and the group drive means 4.

A group drive means 4 is composed of a drive device 5 consisting of a power and deceleration device, and a drive head 6 that is rotated or oscillated by this drive device 5. The upper end of the shaft 1 is rotatably supported, and a drive head 6 is rotated or swung in the horizontal rotation direction by a drive device 5, so that a group of a plurality of rotating vertical shafts can be rotated as one or in the horizontal rotation direction. It is designed to oscillate.

On the other hand, within the drive head 6 there is provided a rotating device 8 consisting of another power and speed reducer, and a gear 9 is provided at the upper end of each rotating vertical shaft 1, each meshing with an adjacent gear 9. , 80 rotations of the rotating device are transmitted to one rotational longitudinal shaft 1, and 10 rotations of one rotational longitudinal shaft are transmitted to the other rotational longitudinal shaft 1 via the gear 9.

Therefore, in this embodiment, the rotating device 8, the group of gears 9, etc. serve as the vertical axis rotating means 3 for rotating each vertical axis of rotation 1.

Here, the arrangement of the respective rotational vertical axes 1 is as shown in Figs. 3 and 4, where a plurality of them are arranged on a straight line, as shown in Fig. 5, on each vertex point of a triangle, and as shown in Fig. 6. An example is shown in which they are arranged on perpendicular lines, but they are not limited to the above arrangement, and may be located at the apex points of other polygons other than triangles, or in shapes other than cross shapes. It may be arranged on each line where a plurality of straight lines intersect, or it may be arranged in a manner other than the above.

A bit 10 is provided at the lower end of each rotating vertical shaft 1, and each rotating vertical shaft 1 is connected by one or more connecting devices 11 so as to maintain accurate mutual positional relationship of each rotating vertical shaft 1. Each rotating vertical shaft 1 is rotatably supported by a connecting device 11.

The rotating vertical shaft 1 is provided with a screw portion 12, a stirring blade portion 13, etc. depending on the application.

FIG. 7 shows a screw part 12 and a stirring blade part 13 in the vertical direction.
The example shown is a combination of a rotating vertical shaft 1 having alternating rotating shafts 1 and a rotating vertical shaft 1 having only stirring blades 13.

Here, the stirring blade part 13 of the rotating vertical shaft 1 is slightly shifted vertically from the stirring blade part 13 of the adjacent rotating vertical shaft 1, and the tips of the adjacent stirring blade parts 13 or the tips of the stirring blade parts 13 are slightly shifted from each other in the vertical direction. Drawing (
The trajectories now overlap.

FIG. 8 shows an example of a combination of a plurality of rotating vertical shafts 1 in which screw portions 12 are set out at regular intervals in the vertical direction and provided at a plurality of locations.

In this case, the screw portions 12 of adjacent vertical rotating shafts 1 are shifted in the vertical direction so that they are not at the same level.

In this embodiment as well, the trajectories drawn by the outer ends of the screw portions 12 of the adjacent vertical rotating shafts 1 overlap with each other.

FIG. 1 shows an example in which a plurality of rotating vertical shafts 1 are combined, each having a plurality of rotating vertical shafts 1 each having a plurality of stirring blades 13 spaced apart at regular intervals in the vertical direction.

In this case, the stirring blades 13 of adjacent rotational vertical shafts 1 are shifted in the vertical direction, and the trajectories drawn by the tips of the stirring blades 13 still overlap.

By the way, as shown in the drawing, the bits 10 installed on adjacent rotating vertical axes 1 are shifted vertically (bits that are adjacent to each other in the radial or circumferential direction of the rotation locus where the rotating vertical shafts rotate as a group are vertically shifted). Also, the independent rotation trajectories of the vertically shifted adjacent bits 10 partially overlap with each other.

Here, the rotation direction of the plurality of rotating vertical shafts 1 can be arbitrarily selected by adjusting the meshing of the gears 9 and the number of gears 9 that transmit rotation.

This direction of rotation is illustrated by arrows in FIGS. 3 to 6.

The direction of rotation of the plurality of rotating vertical shafts 1 can be determined depending on the purpose of the excavation, for example, by determining the relationship between the excavated soil and a liquid such as cement milk or a mixture of cement milk and asphalt in the excavation hole. The direction of rotation of each shaft may be determined depending on the case where mixing and agitation is the main purpose, or when all or part of the excavated soil is to be discharged to the outside.

Therefore, when excavating the ground 2, the ground 2 is excavated by rotating each of the plurality of rotating vertical shafts 1 and also rotating a group of the plurality of rotating vertical shafts 1 as a unit or swinging in the horizontal rotation direction. It is something to be excavated.

In this case, the ground 2 is excavated by each rotary vertical shaft 1, and also by the rotation of a group of multiple rotary vertical shafts 1 as a whole, and by the rotation trajectories of the adjacent 65 bits 10 partially overlapping each other. At the same time, the excavated soil is finely ground by each rotating vertical shaft 10 times, and at the same time, the rotating vertical shaft 1
It is finely ground by rotating the whole group.

If cement milk or a mixture of cement milk and asphalt is injected into the excavated hole during excavation, these liquids and the excavated soil will be mixed and stirred efficiently.

Further, when the earth is removed by the screw part 12, the excavated earth and sand is finely ground, so that the earth can be easily removed.

In the present invention, as described above, bits are provided at the lower ends of a plurality of rotating vertical axes, and the bits of adjacent rotating vertical axes are shifted in the vertical direction, and the rotation trajectories of the dots partially overlap each other. Since the ground is excavated by rotating each of the plurality of rotating vertical shafts and also rotating or swinging the plurality of rotating vertical shaft groups as one, the rotation or swinging of the plurality of rotating vertical shafts as one , the synergistic effect of the independent rotation of each rotary vertical axis during rotation or oscillation of the rotary vertical axes as a unit and the overlap of the rotational trajectories of adjacent bits results in triple drilling, which improves efficiency (drilling). Moreover, it is possible to perform large-diameter excavation with the same size as the locus caused by the rotation or oscillation of the rotary vertical axis group as a unit. Since there is overlap, there is no part of the large-diameter excavation hole that is not excavated, which has the advantage that the inside of the large-diameter excavation hole is uniformly excavated in the horizontal cross section.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an example of an excavator used in the present invention, Fig. 2 is a sectional view taken along the line X-X in Fig. 1, and Figs. 3 to 6 are the arrangement of the same shafts. 7 and 8 are front views of respective embodiments in which a part of the screw and a stirring blade are provided on the vertical axis of rotation of the same excavator, and 1 is a schematic cross-sectional view showing the vertical axis of rotation. , 2 is on the ground.

Claims (1)

[Claims] 1. Bits are provided at the lower ends of the plurality of vertical rotational axes, and the bits of adjacent vertical rotational axes are shifted in the vertical direction, and the rotational trajectories of the bits partially overlap each other, so that the plurality of vertical rotational axes are rotated respectively. A method for excavating the ground, characterized in that the ground is excavated by rotating or swinging the plurality of rotary vertical shafts as a unit.