JP3224435B2 - Construction method of underground continuous wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground continuous wall by using a multi-axial excavator having a plurality of drilling rods.

[0002]

2. Description of the Related Art A method of constructing an underground continuous wall using a multi-axis excavator having a plurality of excavating rods arranged in parallel in one direction on the same line involves a method of constructing an underground continuous wall. Some holes are duplicated for the purpose of homogenizing the consolidated body. Usually, one hole is skipped and the adjacent section is constructed. Mixing is performed in the drilling holes in both sections. In this method, the drilling at both ends of the working section is mixed twice, whereas the drilling in the middle part is mixed only once, so the adjacent working section is mixed. The mixed state becomes inhomogeneous, and there is a possibility that a difference occurs in the strength of the cured compact.

[0003] The present invention has been made by focusing on the problem of the conventional method in the case of performing drilling in an overlapping manner, and intends to propose a construction method in which all drilling holes are evenly mixed.

[0004]

According to the present invention, adjacent construction sections are continuously constructed without skipping one hole,
After that, mixing is performed evenly in all drilled holes by constructing over both construction sections, and a uniform continuous wall is constructed over the construction direction.

The excavator is composed of three excavating rods arranged in one direction and having stirring blades protruding from the peripheral surface at an interval in the axial direction. The solidified body is solidified discharged from the tip of the excavating rod. It is created by stirring and mixing the material and excavated soil with stirring blades.

[0006] In the construction, each time one construction section consisting of three bores in which adjacent bores overlap each other, the construction section adjacent thereto is continuously constructed, and then the preceding construction section and the adjacent construction section are continuously constructed. Both drilling holes are overlapped over both construction sections.

[0007] The underground continuous wall is flat by excavating the ground with a drill rod, mixing excavated soil and solidified material for each construction section, and then mixing inside the drill hole over the adjacent construction section. It is constructed from a solid body that is linearly continuous.

[0008] By making the construction section continuous and reconstructing across both sections after the construction of the adjacent section, each drilling is 2
The mixture is mixed step by step to form a consolidated body having a uniform strength in a continuous direction.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention uses a drilling device 1 having a plurality of drilling rods 2 arranged in one direction as shown in FIG. 1 and drills the number of drilling rods 2 as shown in FIGS. This is a method of continuously constructing adjacent construction sections consisting of the group No. 4 and constructing an underground continuous wall composed of a solidified body that is linearly continuous in a plane.

A drill bit 21 is connected to the lower end of the drill rod 2 as shown in FIG. 1, and a stirring blade 22 is provided on the peripheral surface of the main body at an appropriate interval in the axial direction. All the excavating rods 2 are simultaneously rotated by the speed reducer connected upward, and the interval between them is maintained by the connecting bracket 3.

In each construction section, the excavating device 1 is vertically excavated while discharging the solidified material from the tip of the excavating rod 2, whereby the excavated soil and the solidified material are stirred and mixed by the stirring blades 22. Each time one construction section consisting of the borehole 4 is constructed, the construction section adjacent to the construction section is continuously constructed. As shown in FIGS. 2 and 3, the drilling holes 4 and 4 in both the working sections are constructed after the working in the adjacent working sections.
It is not always necessary to inject the solidification material during excavation that is performed repeatedly.

FIG. 2 shows a case where one hole 4 in the preceding section is overlapped with two holes 4 in the section constructed later. FIG. 3 shows two holes 4 in the preceding section. A case is shown in which the drilling holes 4 and 4 are overlapped with one of the drilling holes 4 in a section constructed later.

[0013]

According to the present invention, adjacent drilling sections are continuously constructed without skipping one drilling hole, and then both drilling holes are overlapped over both drilling sections. Mixing is performed evenly, and a continuous continuous wall can be constructed over the construction direction.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a state during excavation according to the present invention.

FIG. 2 is a plan view showing a procedure of excavation.

FIG. 3 is a plan view showing another procedure of excavation.

[Explanation of symbols]

Reference Signs List 1 excavating device, 2 excavating rod, 21 excavating bit, 22 stirring blade, 3 connecting metal fitting, 4 drilling

Claims (1)

(57) [Claims] 1. A drilling device comprising three drilling rods arranged in parallel in one direction and provided with stirring blades projecting from the peripheral surface at intervals in the axial direction, is vertically excavated, and discharged from the tip of the drilling rod. After mixing and mixing the solidified material and excavated soil, and each time one construction section consisting of three drilling holes where adjacent drilling holes overlap each other, the construction section adjacent to this is continuously constructed,
It is a method of straddling the preceding construction section and the construction section adjacent to it, duplicating the drilling of both, and constructing an underground continuous wall consisting of a solid body that is continuous linearly in a plane. One of the drilled sections of the section that was constructed and the two sections of the section that was constructed later overlapped, or two sections of the section that was constructed earlier and the section that was constructed later A method for constructing an underground continuous wall, wherein one of the holes is overlapped.