JPS5945055B2 - multi-axis excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-axis drilling machine for drilling group holes, and in which a pair of adjacent drilling shafts 1 of a plurality of drilling shafts 1 disposed substantially parallel to each other have vertical positions. The drilling blade 2 is characterized in that different spiral cutting blades 2 are provided, and the cutting blades 2 are formed to have a diameter such that the outer peripheries of the digging blades 2 provided on adjacent drilling shafts 1 overlap vertically. The present invention relates to an axial excavator, and the object of the present invention is to be able to form a chain-like group of holes in which adjacent holes are continuous, and when cement milk or the like is injected to form an earth retaining wall, there will be no gaps in the earth retaining wall. To provide a multi-shaft excavator capable of excavating without any risk of infiltration of earth and sand or groundwater.

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

The upper ends of a plurality of excavation shafts 1 whose axes are arranged in a line are connected to a multi-axis device 3 so that the rotation of the rotation device 4 is transmitted to the excavation shaft 1 via the multi-axis device 3. It has become.

A drilling bit 5 is provided at the lower end of each drilling shaft 1.

The excavation shaft 1 is provided with spiral excavation blades 2 such that the vertical positions of adjacent excavation shafts 1 are different.
The excavating blades 2 are formed to have a diameter such that the outer circumferential parts of the excavating blades 2 provided in the excavating blades 2 overlap vertically.

The portion of each excavation shaft 1 other than the excavation blade 2 has a flat plate shape, a flat bar shape,
An excavating blade 2 in which round bar-shaped stirring blades 8 are protruded, and the stirring blades 8 are formed in a size such that the outer peripheral parts of adjacent stirring blades 8 are vertically overlapped, and the outer peripheral ends of the stirring blades 8 are adjacent to each other. It is designed to fit inside the outer periphery.

In some cases, such stirring blades 8 are not installed.

Reference numeral 6 denotes a connecting rod for connecting the respective excavating shafts 1 so that they do not come apart, and each excavating shaft 1 is loosely fitted into the connecting hole 7 of the connecting rod 6.

The rotary device 4 is then rotated to excavate with the bit 5 at the tip of the excavation shaft 1.

At this time, a fluid such as cement milk or bentonite mud is injected from the bit 5 to facilitate excavation.

When excavation is continued by injecting the fluid, part of the excavated soil is removed by the excavation blades 2, and the remaining excavated soil and the fluid are mixed by the stirring blades 8 and the excavation blades 2.

When the soil is stirred using the stirring blade 8 and the excavating blade 2 as described above, the density of the soil becomes uniform in the upper and lower portions.

Further, the hole walls 9 excavated as described above are connected in a string pattern as shown in FIG. 3, forming a generally rectangular wall hole as a whole.

When the excavation is completed, if the fluid injected during excavation is a consolidation fluid that has the property of consolidating soil, such as cement milk or a mixture of cement milk and asphalt emulsion, the fluid must be injected. The excavation shaft 1 is pulled out while moving up and down to create a complete mixture of soil and consolidation fluid.

In addition, if the fluid injected during excavation is a soil stabilizing liquid such as bentonite mud, when the excavation is completed, cement milk or a mixture of cement milk and asphalt emulsion is injected instead of bentonite mud. 1 is removed while moving up and down, and the bentonite mud is replaced with cement milk or a mixture of cement milk and asphalt emulsion.

At this time, excavated earth and sand and a liquid mainly composed of cement milk are mixed and stirred by stirring blades 8.

After the bentonite mud water is replaced with cement milk or a mixed liquid of cement milk and asphalt emulsion, the excavation shaft 1 is removed.

When the cement milk solidifies after removing the drilling shaft 1,
A water stop wall A is formed as shown in FIG.

As described above, in the present invention, the excavation blades are formed with a diameter large enough that the outer peripheral parts of the excavation blades provided on the excavation shaft overlap vertically, so that when the excavation shaft is inserted into the soil and excavated, adjacent holes are It is possible to form a continuous string of holes, and when an earth retaining wall is formed by injecting cement milk, etc., there is no gap in the earth retaining wall, and there is no possibility that earth and sand or groundwater may infiltrate.

If stirring blades are provided on the excavation shaft other than the drilling blades, the stirring blades will stir the earth and sand together with the fluid, making the density of the earth and sand uniform above and below the hole.

Furthermore, if the outer peripheries of the stirring blades of adjacent excavation shafts are overlapped vertically, and the outer periphery of each stirring blade is placed inside the outer periphery of the adjacent excavation blade, stirring and mixing will be more effective. be done.

[Brief explanation of drawings]

Fig. 1a is a front view of an embodiment of the present invention, Fig. 1 is a plan sectional view of the same as above, Fig. 2 is a plan view of the connecting rod of the above, and Fig. 3 is a plan view of the hole drilled by the above. The sectional view and FIG. 4 are front sectional views of the earth retaining wall formed by the same method as above, where 1 is an excavation shaft and 2 is an excavation blade.

Claims (1)

[Scope of Claims] 1. Spiral-shaped excavation blades are provided so that the vertical positions are different in a pair of adjacent excavation shafts among a plurality of excavation shafts arranged substantially parallel to each other along the vertical direction, and A multi-axis excavator characterized in that the excavating blades are formed with a diameter large enough that the outer peripheral parts of the excavating blades provided on matching excavating shafts overlap vertically. 2. The multi-shaft excavator according to claim 1, characterized in that a stirring blade is provided in a portion of each excavating shaft other than the excavating blade. 3 Spiral-shaped excavation blades are provided so that the vertical positions are different between a pair of adjacent excavation shafts among a plurality of excavation axes arranged substantially parallel to each other along the vertical direction, and also provided on the adjacent excavation axes. The excavating blades are formed with a diameter large enough that the outer peripheries of the excavating blades overlap each other vertically, and stirring blades are provided on the parts other than the excavating blades of each excavating shaft, so that the outer peripheries of the stirring blades provided on adjacent excavating shafts overlap each other. A multi-shaft excavator characterized in that the size of the stirring blades overlaps vertically and the outer circumferential edge of each stirring blade is located inside the outer circumferential edge of the adjacent excavating blade.