JPH04140314A - Construction method of peristyle continuous underground wall - Google Patents

Abstract

PURPOSE:To enable deep excavation by forming a large number of excavated bores in multiple rows, with adjacent bores overlapping each other, forming soil cement piles in the excavated bores and inserting stress bearing members having large sections across the excavated bores which are oppositely located. CONSTITUTION:A large number of excavated bores 10 are formed in multiple rows, with adjacent bores overlapping each other. Next, stress bearing members 11 are inserted into the bores 10, each of said members 11 being disposed across the oppositely located bores 10, after which cement hardening material is poured into each of the bores 10 to mix the material with the soil in the bores 10, so that soil cement piles 12 are formed integrally with one another, in longitudinal and lateral directions. The opposite ends of the stress bearing member 11 made up of steels are connected by connecting pieces to form said member into a H-shape having large section. As a result, an underground wall W, in which the stress bearing members 11 are integrally provided, can be constructed as an earth retaining wall and hence greatly deep excavation can be performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for constructing continuous underground walls using columnar columns, and in particular, excavates the ground in a columnar manner and connects the soil in the excavated hole. The present invention relates to an improvement in a column-type continuous underground wall construction method in which a tefill-cement heil is formed by stirring and mixing with a cement-based hardening material, and a stress-bearing material is inserted into the soil-cement pile.

[Prior Art] As a conventional construction method of this type, the fill cement column pile construction method is known. Therefore, this construction method will be explained with reference to FIG. 6 of the attached drawings. In the figure, (+) indicates drilling holes drilled in three-axis rows by an excavator. In the figure, excavation is performed in three axial rows, but excavation may also be performed in one axial or multiple axial rows. A cement-based hardening material is injected into the borehole (IXI) thus excavated, and the borehole (+) is injected into the borehole (IXI).
(1) A soil cement pile (2) (2) is formed by stirring and mixing with the soil inside.

After that, this soil cement pile (2) (2)...
The underground wall was constructed by inserting stress-bearing materials (3) (3), such as H steel, into the underground wall.

[Problem to be solved by the invention] The conventional construction method described above is widely used because it is a relatively low-cost construction method, but as the depth increases, the required cross section of the underground wall increases. This problem cannot be dealt with using conventional construction methods. That is, when using this construction method, as the root cutting depth increases, the cross-sectional dimension of the stress-bearing material must also increase, or if the size of the excavated hole of this construction method is It cannot cope with the large cross-sectional dimensions of the burden material.

Therefore, a technical problem arises that needs to be solved in order to construct an underground wall using a stress-bearing material that has a very deep root cutting depth and therefore a large cross-sectional dimension to accommodate this. The present invention aims to solve this problem.

[Means for Solving the Problems] The present invention was proposed to achieve the above object, and involves injecting a cement-based hardening material into the boreholes formed by excavating the ground in columns. In an underground wall construction method in which a soil-cement pile is formed by stirring and mixing with the soil in the excavation hole, and then a stress-bearing material is inserted into the soil-cement pile, the excavation hole is A soil cement pile is formed in the excavation hole in a multi-row, multi-axis configuration, and a stress-bearing material with a large cross section is inserted across the front and rear opposing excavation holes. The purpose of this study is to provide a method for constructing columnar continuous underground walls.

[Function] Since the present invention forms the excavation holes in multiple rows and multiple axes, it is possible to insert stress-bearing materials with large cross-sectional dimensions across the soil cement piles facing each other in the front and rear.

Therefore, deep root cutting excavation is possible, and since the wall thickness is increased, water-stopping performance is also improved.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5 of the attached drawings. θ0) is an excavated hole formed by excavating the ground with an excavator. In the figure, the excavated holes (10), (10), and - are lapped with each other and are formed triaxially on two sides, but the number of rows is the stress-bearing material (+ +)Q 1) It is determined by the size of... and may be on two or more sides.

In the figure, the stress-bearing material (I +) (l l) -... is an excavated hole (10) θ formed triaxially on two sides.
0) ..., the drilling hole facing forward and backward (+o)Qo
), (In)(10), and (IOXI[+), respectively. Therefore, the borehole (Ill) (
III)... are larger than the front and rear [1], and the stress-bearing members (1+) (j+) inserted therein may also have large cross-sectional dimensions.

Then, a cement-based hardening material is injected into each of the drilled holes (In)Qo), and the drilled holes Qo)Qo)
The soil within... is stirred and mixed to form soil cement piles (13 (+2...-) that fuse with each other in the front, back, left, and right directions, and the stress-bearing material (11M++)... is the soil cement pile. It is natural that it is inserted into the pile (L!l(1■...).

The stress-bearing member (11) shown in FIG. 2 is made of steel, and is formed into a substantially H-shape with a large cross-sectional dimension by connecting the front and rear pieces with two connecting pieces.

In addition, the stress-bearing material (lla) (1) shown in FIGS. 3 to 5
1a)... are each made of precast concrete. The one shown in Fig. 3 is formed into a flat plate shape, but the ones shown in Figs. 4 and 5 are each formed into a trapezoidal shape.
to)..., the soil cement pile θ
(■...The soil cement inside is combined into a wedge shape and the soil cement pile (1 neck...) and the stress-bearing material (Ila) formed of precast concrete (I
la) ... are strongly combined as one, and there is no possibility that they will separate from each other.

In this way, the drilling hole (+(1)(1)
0)... Soil cement pile shaped inside (+2
(1■...) Stress-bearing material Q +) (+
+) ... and (llaHlla) ... are also integrally connected to construct the underground wall (W), so when carrying out root cutting excavation, the underground wall (W) It is possible to sufficiently cope with lateral pressure by joining the gully in an upright position, fixing and supporting the upright θ-cut beam, and using the underground wall (W) as a retaining wall. , it becomes possible to excavate roots at great depths.

Note that this invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that this invention extends to such modifications.

[Effects of the Invention] As detailed in the above-mentioned embodiment, the present invention forms a multi-row, multi-axis drilling hole to be drilled into the ground, and a soil cement pile formed in the drilling hole. Since the stress-bearing material is inserted across the front and back, the stress-bearing material must have a large cross section. Therefore, it becomes possible to excavate roots at great depths, which increases the stress of the underground walls, and also increases the wall thickness of the underground walls, which improves municipal water quality. This invention has the following effects.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, FIG. 1 is a plan view showing a multi-row, multi-axis drilling hole, and FIGS. 2 to 4 show stress burden on the drilling hole in FIG. 1. FIG. 5 is a plan view showing the state in which the materials have been inserted, and FIG. 5 is an explanatory plan view showing root cutting and excavation. FIG. 6 is a plan view of a conventional type.

Claims (1)

[Claims] A cement-based hardening material is injected into the excavated holes formed by excavating the ground in columnar rows and mixed with the soil in the excavated holes to form a soil cement pile. In the method of constructing an underground wall by inserting stress-bearing materials therein, the excavated holes are formed in multiple rows and multiple axes while wrapping each other, and a soil cement pile is formed in the excavated holes, Furthermore, the column-type continuous underground wall construction method is characterized by inserting a stress-bearing material having a large cross section across the front and rear opposing excavated holes.