JPS6326232B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excavation method capable of simultaneously forming an underground borehole and expanding its diameter.

If the diameter of the hole formed by the excavator is not as large as the desired size, it is necessary to use the same excavator to excavate and widen the area around the previously excavated hole, but this work involves repeatedly moving the excavator up and down. The excavator is equipped with a diameter expanding device, which requires a lot of effort.
Various methods have been devised to expand the diameter at the same time as excavation.

For example, a drilling device having a rotary bit at its tip is provided with an auxiliary bit extending above the bit in an umbrella shape to enlarge the diameter of the side wall of an already drilled hole.

Such equipment requires separate earth removal treatment during excavation, complicating the excavation process, making the entire equipment a complicated mechanism, and has the drawback that the enlarged borehole wall is prone to collapse.

The purpose of the present invention is to solve the above-mentioned disadvantages, to efficiently carry out diameter expansion excavation and soil removal, and to obtain a well-consolidated excavation hole with a solid side wall by using a device with a simple structure and less trouble. Our goal is to provide a construction method that can.

This purpose, according to the present invention, is an excavating device that can remove soil by installing a jack having an arcuate pressing plate perpendicular to the rod horizontally on the lower end of the rotating shaft of an excavating tool consisting of a drilling bucket. form,
Using this excavation equipment, first excavate to a certain depth with the diameter expansion device retracted, then pull up the entire equipment and remove the soil, then reinsert the equipment into the excavation hole and press the diameter expansion device at the already excavated location. This is accomplished by expanding the diameter by pressure and then further drilling the tip of the borehole with a drilling tool.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, to explain the excavation equipment used in the construction method of the present invention, Fig. 1 is a side view of the entire equipment, Fig. 2 is a cross-sectional plan view of the main parts, and Fig. 3 is a vertical cross-sectional side view of the same.
In the figure, 1 is a drilling bucket consisting of an earth drill attached to a vehicle or the like.

A horizontal plate 3 is provided at the lower end of a rotating shaft 2 through a bearing etc. so as not to receive the rotational force of the shaft 2, and jacks 4 and 4' are mounted horizontally on the horizontal plate 3. and vertical arc-shaped pressing plates 6, 6' are attached to the left and right rods 5, 5' of the jacks 4, 4' with pins.

On the other hand, there is a small jack 7 in the center of the horizontal plate 3,
7' on both sides of the rotating shaft 2,
Small jack 7, 7' rod with packing 8,
Abutting tools 9, 9' having 8' are provided, and the rotary shaft 2 can be held between the abutting tools 9, 9' from both sides.

Next, the excavation method of the present invention will be explained based on FIGS. 4 to 7.

As a first step, the drilling bucket 1 is driven from the ground surface with the jacks 4, 4' retracted, that is, with the pressing plates 6, 6' not expanded. 1 and the height of the pressing plates 6 and 6', which is the total distance L or more
form 0.

Next, in the second step, as shown in FIG. 5, the entire apparatus is lifted above ground, and the soil coming out of the excavation hole 10 is discharged by opening the tip of the bucket 1.

Note that the above steps do not necessarily need to be performed at once, and may be performed in multiple steps.

In the third step, as shown in Fig. 6, the entire device is reinserted into the excavated hole 10, and the jacks 4, 4' are operated to push the pressing plates 6, 6' outward, thereby excavating. The diameter of the side wall of the hole 10 is expanded by a pressing force.

Note that the pressing plates 6, 6' are each formed in an arc shape, and even if they are combined, they will not form a perfect circle, but by operating the small jacks 7, 7', the abutting tools 9,
9' to sandwich the rotating shaft 2, and in this state, rotate the rotating shaft 2.
If you turn it, the jacks 4, 4' and pressing plates 6, 6' will also rotate via the horizontal plate 3, and the side wall of the excavation hole 10 will be rotated.
It can also be expanded 360°.

In the fourth step, as shown in Fig. 7, with the jacks 4, 4' retracted and the press plates 6, 6' retracted, the rotary shaft 2 is rotated to drive the drilling bucket 1 to drill the drilling hole. Drill the tip of 10.

After that, repeat the above earth removal, pressing diameter expansion, and excavation,
A borehole will be obtained at the desired depth.

As described above, the excavation method of the present invention uses an excavation device that combines an excavation tool that can remove soil and a diameter expansion device for pressing, so that excavation, soil removal, and diameter expansion can be carried out in a well-procedure manner. This can be carried out by a device, and since the diameter expansion is carried out by the pressing force of a pressing plate, the side wall of the diameter-expanded borehole is consolidated and becomes solid, so there is no risk of it collapsing under some circumstances.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the entire excavation equipment used in the present invention, Fig. 2 is a cross-sectional plan view of the main parts of the same, Fig. 3 is a vertical cross-sectional side view of the main parts, and Figs. 4 to 7 are the main parts. It is a side view showing the process of the example of the excavation method of the invention. 1... Drilling bucket, 2... Rotating shaft, 3
...Horizontal plate, 4,4'... Jacket, 5,5'...
Rod, 6, 6'... Pressing plate, 7, 7'... Small jack, 8, 8'... Packing, 9, 9'... Contact tool, 10... Drilling hole.

Claims (1)

[Claims] 1 A jack with an arc-shaped pressing plate perpendicular to the rod is attached horizontally to the lower end of the rotating shaft of an excavating tool consisting of a drilling bucket to form an excavating device with a diameter expanding device that can remove soil, and the excavating device is used. First, the diameter expanding device is contracted and excavation is performed to a certain depth. After the entire device is pulled up and the soil is removed, the device is reinserted into the excavation hole and the diameter of the already excavated area is expanded by the pressing force of the diameter expanding device. , and then further excavating the tip of the drilled hole using a drilling tool.