JPS6349768B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ground excavation method, in which a plurality of hollow rotary vertical shafts 1 are entirely covered with a rotating cylindrical casing K, the casing K is rotated, and the inside of the rotating casing K is The ground 2 is excavated by rotating each of the plurality of rotating vertical shafts 1 and rotating or swinging the plurality of rotating vertical shafts 1 as a unit, and ejecting liquid from the hollow rotating vertical shaft. The present invention relates to a ground excavation method characterized by mixing soil with a liquid and a liquid.

The object of the present invention is to rotate a plurality of rotating vertical shafts within a rotating cylindrical casing, and also to rotate or swing a group of rotating vertical shafts as a unit, thereby controlling the rotation of the casing and the rotating vertical shafts. Efficient excavation and stirring is achieved by the synergistic effect of the rotation or rocking of the group as a unit, and the independent rotation of each rotating vertical shaft during the unified rotation or rocking of this rotating vertical shaft group. , the excavation of the ground allows mixing, and the excavation is carried out inside a rotating casing without damaging the surrounding ground, making it possible to easily form soil-cement columns and soil-asphalt-cement columns with extremely large diameters, uniform strength, and strong We are here to provide you with a method.

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,
This excavator A includes vertical shaft rotation means 3 for rotating each of a plurality of rotating vertical shafts 1 located on a straight line or on intersecting straight lines or at each apex point of a polygon.
and a group driving means 4 for rotating or swinging a group of a plurality of rotating vertical shafts 1 as a unit, and furthermore, a cylindrical casing K in which the plurality of rotating vertical shafts 1 are entirely rotated is provided. be. Here, each rotating vertical shaft 1 has a hollow pipe shape, and the inside thereof is used to supply a liquid such as cement milk, a mixture of cement milk and asphalt emulsion, or bentonite. FIGS. 1 and 2 show an example of the vertical axis rotation means 3 and the group drive means 4. FIG. A group driving means 4 is composed of a driving device 5 consisting of a power and deceleration device, and a driving head 6 rotated or oscillated by this driving device 5. The upper end of the rotating vertical shaft 1 is rotatably supported, and a group of multiple rotating vertical shafts is rotated as a unit by rotating or swinging the drive head 6 in the horizontal rotation direction by the drive device 5. Or it is designed to be swung in the horizontal rotation direction. On the other hand, within the drive head 6 there is provided a rotating device 8 consisting of another power and speed reduction device, and each rotating longitudinal shaft 1
Gears 9 are provided at the upper end, each meshing with an adjacent gear 9, so that the rotation of the rotating device 8 is transmitted to one rotating vertical shaft 1, and the rotation of one rotating vertical shaft 1 is transmitted to the gear 9. The rotational axis 1 is transmitted to the other rotating vertical shaft 1 via the rotating shaft 1. Therefore, in this embodiment, the rotating device 8, the group of gears 9, etc. serve as the vertical shaft rotating means 3 for rotating each vertical shaft 1 of rotation. Also, to show an example of a mechanism for rotating the casing K, as shown in FIG. A transmission gear E rotatably supported on a base B is meshed with a central gear D.
The rotation of the drive device 5 is transmitted to the casing K by meshing with the gear train F on the inner surface of the upper part of the casing K. Here, the casing K rotates but is supported so as not to move relative to the base B. At the bottom or center of each rotating vertical shaft 1 or at the bit 10, there is a spout G for spouting a liquid substance.
is provided. The liquid is supplied from above one rotating vertical shaft 1, and is connected to the other rotating vertical shaft 1 through a branch pipe H.
It is supplied to the upper end of the Here, the arrangement of each rotational vertical axis 1 is a plurality of them arranged in a straight line as shown in Figs. 3, 4, 7, and 8, or a triangular arrangement as shown in Figs. 5 and 9. The examples shown are those arranged on vertex points and those arranged on orthogonal lines as shown in Figs. 6 and 10, but the arrangement is not limited to the above arrangement, and other polygonal shapes other than triangles are shown. It may be located at the apex point of , or it may be located on each line where a plurality of straight lines other than a cross intersect, or it may be located at a position 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 1, so that the mutual positional relationship of each rotating vertical shaft 1 can be accurately determined. It is designed to maintain each rotation vertical axis 1
is rotatably supported on the coupling 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. 1 shows an example in which a screw portion 12 is provided over the entire length of each rotating vertical shaft 1. FIG. 11 shows an example in which a rotating vertical shaft 1 having screw portions 12 and stirring blade portions 13 alternately in the vertical direction and a rotating vertical shaft 1 having only stirring blade portions 13 are combined. Here, the stirring blade part 13 of the rotating vertical shaft 1 is slightly shifted in the vertical direction from the stirring blade part 13 of the adjacent rotating vertical shaft 1, and the tip parts 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. The trajectories drawn now overlap.
Of course, it may be possible to avoid duplication. FIG. 12 shows an example of a combination of a plurality of rotating vertical shafts 1 provided at a plurality of locations with screw portions 12 spaced apart from each other at regular intervals in the vertical direction. In this case, the screw portions 12 of adjacent rotating vertical shafts 1 are shifted in the vertical direction so that they are not on the same level. In this embodiment as well, the trajectories drawn by the outer ends of the screw portions 12 of adjacent vertical rotating shafts 1 overlap with each other. FIG. 13 shows an example of a combination of a plurality of rotating vertical shafts 1 provided at a plurality of locations with stirring blades 13 spaced apart from each other at regular intervals in the vertical direction. In this case, the stirring blades 1 of the adjacent rotating vertical shafts 1
3 are shifted in the vertical direction, and the trajectories drawn by the tips of the stirring blades 13 overlap each other. Note that FIGS. 3, 4, 5, and 6 show examples in which the trajectories drawn by the ends of the screw part 12 or the stirring blade part 13 overlap, respectively.
They may not overlap as shown in FIGS. 7, 8, 9, and 10. 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 10. The direction of rotation of the plurality of rotating vertical shafts 1 can be determined depending on the purpose of the excavation, for example, between the excavated soil in the excavation hole and a liquid such as cement milk or a mixture of cement milk and asphalt. The direction of rotation of each shaft may be determined depending on the case where the main purpose is mixing and agitation, or when all or part of the excavated soil is to be discharged to the outside. Note that I in the figure is an earth removal window used when removing excavated earth and sand. Therefore, when excavating the ground 2, the casing K is rotated, and the plurality of rotating vertical shafts 1 are individually rotated within the rotating casing K, and the plurality of rotating vertical shafts 1 are rotated as a unit, or By swinging in the horizontal rotation direction, the ground 2 is excavated, and a liquid material is ejected from the spout G of each hollow rotating vertical shaft 1. In this case, the ground 2 is excavated by the rotation of the casing, by each rotating vertical shaft 1, and by the rotation of a group of a plurality of rotating vertical shafts as a whole; The excavated soil is finely ground in the simultaneously rotating casing K by the rotation of each rotating vertical shaft 1, and also by the rotation of the entire group of rotating vertical shafts 1. If cement milk or a mixed liquid of cement milk and asphalt is injected into the excavated hole during excavation, mixing and stirring of these liquids and excavated soil will be performed efficiently. Further, when the earth is removed by the screw portion 12, the excavated earth and sand is finely ground, so that the earth can be easily removed.

In the present invention, a plurality of hollow rotating vertical shafts are entirely encased in a rotating cylindrical casing, the casing is rotated, and the plurality of rotating vertical shafts are individually rotated within the rotating casing. The ground is excavated by rotating or swinging the rotating vertical shafts of the book, and the liquid is ejected from the hollow rotating vertical shaft, so the rotation of the casing and the rotating vertical shafts inside the rotating casing are integrated. Excavation, stirring, and mixing can be performed by the synergistic effect of the rotation or rocking, and the independent rotation of each rotary shaft during the integral rotation or rocking of this group of rotary vertical shafts, Large-diameter soil-cement pillars and soil-asphalt-cement pillars can be easily formed in the ground through efficient excavation, stirring, and mixing. In particular, stirring and mixing of finely pulverized excavated soil and liquid is effective. It is carried out uniformly throughout the entire excavation hole, making it possible to form large-diameter soil-cement columns and soil-asphalt-cement columns that are strong and uniform in overall strength, and because the excavation is carried out inside a rotating casing, It allows accurate excavation without damaging the surrounding ground, and since the rotating vertical shafts rotate or swing together within the casing, the rotating vertical shafts work together as a unit without experiencing significant resistance from the surrounding ground. It has the advantage of rotating or swinging smoothly. If excavated continuously, thick soy-cement walls and soil-asphalt-cement walls can be formed. Furthermore, if the casing is made removable, a large diameter casing can be driven in by pulling up the excavator while leaving the casing in the ground.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an example of an excavator used in the present invention, and Fig. 2 a and b are Fig. 1 XX.
Figure 1 is a cross-sectional view along line Y--Y, Figures 3 to 10 are schematic cross-sectional views showing the arrangement of the shafts of the above, and Figures 11 to 13 are schematic cross-sectional views of the same excavator. It is a front view of each embodiment in which a screw part and a stirring blade part are provided on the rotating vertical shaft, and 1 is the rotating vertical shaft, 2 is the ground, and K is the casing.

Claims (1)

[Claims] 1 Encasing the entire plurality of hollow rotating vertical shafts in a rotating cylindrical casing, rotating the casing, rotating each of the plurality of rotating vertical shafts within the rotating casing, and simultaneously encasing the plurality of hollow rotating vertical shafts. Excavating the ground by rotating or shaking the group as a unit,
A ground excavation method characterized by ejecting a liquid material from a hollow rotating vertical shaft and mixing soil with the liquid material.