JPS6314920A - Displacement method - Google Patents

Abstract

PURPOSE:To improve economy, by embeding the stiffeners of high tensile strength horizontally in good subsoil, when the soil of poor foundation ground is excavated and removed to be displaced with the good subsoil. CONSTITUTION:The soil of poor foundation ground is excavated way to form a displacing section 1. After that, when good subsoil is placed in the displacing section 1, then two or more layers of the stiffeners 2 of the plastics, the metals, or the like of high tensile strength are horizontally embeded in the good subsoil. Accordingly, the cross-sectional area of the displacing section 1 can be made smaller than the cross-sectional area of a displacing section 3 by a conventional displacement method.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a replacement method for excavating and removing undesirable soil from foundation ground and replacing it with good quality soil.

(Problems to be solved by the invention and its characteristics) The disadvantage of the replacement method is that as the replacement depth increases, a large amount of soil is repelled, a large amount of high-quality soil is required, and the construction efficiency decreases.

The present invention aims to provide a replacement method that can reduce the depth of replacement, and its structural features are as described in the claims.

Horizontally burying reinforcing materials with high tensile strength in the ground promotes the dispersion of stress in the ground in the vertical direction due to loaded loads, but the present invention utilizes the v8m dispersion effect of this reinforcing material in the replacement method. .

(Detailed description of the invention with drawings) First, the present invention will be explained in principle with reference to FIG.

Assuming that a uniformly distributed load flq with a width of 81 depth is distributed linearly in the ground with a dispersion angle θ, and if the stress in the ground in the vertical direction at the depth Z of the ground due to q is, then the replacement method is based on this load. This method utilizes the dispersion phenomenon of Pz +
, good quality ± (on substitution) unit [with T as Fz+ > C”ZI to r ・Z
I--(1) holds.On the other hand, if a reinforcing material R with a high tensile strength is buried horizontally in the ground, the dispersion angle θ will become larger and shallower than Zl. Equation (11) holds true at depth ZJ.

The present invention utilizes the load dispersion effect of this reinforcing material R in the replacement construction method, and as shown in Fig. 2,
When replacing the original soil in the replacement section 1 with good quality soil, reinforcing material 2 made of a material with high tensile strength (plastic, glue, metal, etc.) is buried horizontally in the good quality soil. Therefore, the cross section of the replacement part 1 can be made smaller than the cross section of the replacement part 3 in the conventional replacement method.

Reinforcement material 2 is placed in good quality soil as shown in Figures 2-4. !
As mentioned above, it is effective to bury at different depths.

The reinforcing material 2 is usually a net or a sheet, but in some cases it may be made of lined strips.

Further, if the reinforcing material 2 is a net, for example, it may be formed into a net shape in advance or may be formed into a net shape at the buried position.

The ends of the reinforcing material 2 are treated, for example, by pinning each layer with stakes 4 as shown in FIG. 3, or by fixing them together on the ground surface as shown in FIG. 4.

(Effects of the Invention) Since the construction method of the present invention is as described above, the replacement depth in the replacement construction method can be made shallow, the replacement cross section can be made small, and the economic efficiency of the replacement construction method can be improved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the principle of the present invention, and Figure 2 is a diagram showing the construction method of the present invention.
3 is a cross-sectional view of each replaced portion by the conventional construction method, FIG. 3 is an example of end treatment of the reinforcing material, and FIG. 4 is a view of the other side. 1; Replacement part, 2; Reinforcement material,...

Claims (1)

[Claims] This is a replacement method characterized by horizontally burying reinforcing material made of an appropriate material with high tensile strength in the good quality soil when excavating and removing undesirable soil from the foundation ground and replacing it with good quality soil.