JPH0515849B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing a corner retaining wall from sliding by reducing earth pressure.

[Problem that the invention seeks to solve]

As a result of the corner retaining wall receiving horizontal earth pressure in two directions, the resultant force is greater than the earth pressure acting on the straight retaining wall, and the sliding resistance is smaller than that of the straight retaining wall. In order to resist earth pressure in the same way as a retaining wall, it is necessary to provide a means to increase its sliding resistance.

This invention was made based on these circumstances, and aims to propose a method for preventing the corner retaining wall from sliding by reducing the earth pressure acting on the retaining wall.

[Means for solving problems]

In the present invention, the internal friction angle of the soil is increased by arranging a mesh plate with many holes in the back soil of the corner retaining wall, which has wall surfaces and bottom slabs integrated in two directions, and the corner retaining wall The aim is to reduce the earth pressure acting on the area.

The mesh plate has a large number of holes to tightly interlock the soil, increasing the restraint between the soil on top and between soil particles, and reducing the internal friction angle of the soil between the mesh plate and the overlying soil. Enlarge.

Since the earth pressure coefficient decreases as the internal friction angle of the soil increases, the acting earth pressure is reduced by increasing the internal friction angle.

The mesh plate is placed on the back soil side of the bottom slab of the retaining wall, and connected to this in the direction of the resultant force of the earth pressure applied to the wall surface of each corner of the retaining wall, or it is placed in the back soil above the bottom slab at intervals upward. They are arranged in multiple stages.

When connected to the bottom slab, the mesh plate has the effect of increasing the frictional force in addition to increasing the internal friction angle of the soil.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment. First, the first invention will be explained with reference to FIGS. 1 to 3.

As shown in the figure, the mesh plate 2 is constructed so that the central axis in the longitudinal direction of the mesh plate 2 coincides with the direction of the resultant force of the earth pressure applied to each wall surface of the corner support A, which is integrally constructed with wall surfaces in two directions and a bottom plate. This method increases the internal friction angle of the back soil by arranging the plate 2 and connecting it to the bottom slab 1, thereby increasing the stability against sliding of the corner retaining wall A.

The mesh plate 2 is a mesh-shaped plate with a large number of holes made of metal plates such as expanded metal and punched metal, as well as plastic and chemical fiber nets. 3 and 3 are connected by constructing a wire 4 or the like between them.

There is no particular need to level the ground at the location where the mesh board 2 is installed, and the size and number of the mesh board 2 can be arbitrarily adjusted depending on the magnitude of the earth pressure. Furthermore, the third
It is also effective to fix the mesh board 2 with stakes 5 as shown in the figure.

The mesh plate 2 strengthens the engagement with the overlying soil, increases the resistance between them or between soil particles, and plays the role of increasing the internal friction angle of the soil, and by increasing the internal friction angle, the earth pressure coefficient, Works to reduce earth pressure. This increases the stability of the corner retaining wall A against sliding.

The mesh plate 2 also serves to increase the sliding resistance of the corner retaining wall A by applying the frictional force acting on the mesh plate 2 to the bottom plate 1 by being connected to the bottom plate 1.

Next, the second invention will be explained based on FIGS. 4 and 5.

In this invention, as shown in Fig. 5, mesh plates 2 are arranged in multiple stages in the back soil at the upper part of the bottom slab 1. By arranging them in multiple stages, the internal friction angle of the back soil is increased and This is to reduce the earth pressure acting on retaining wall A. In the embodiment, the mesh plate 2 is separated from the corner retaining wall A, but the two may be connected.

The material of the mesh plates 2 is the same as that of the first invention, and a plurality of mesh plates 2 are arranged horizontally in the back soil at intervals in several stages as shown in FIG.

In the present invention, as shown in FIG. 4, it is preferable to arrange the bottom plate 1 at a position where it wraps around the bottom plate 1 and the inside thereof, that is, the soil on the ground side, in order to reduce the internal friction angle. In this case as well, the size and number of mesh plates 2 are adjusted depending on the earth pressure.

In addition, in this invention, by arranging a plurality of mesh plates 2, the state of restraint of the soil on the bottom plate 1 is strengthened, and the effect of increasing the internal friction angle is also high.

In both of the above two inventions, the internal friction angle of the back soil on the bottom slab 1 becomes larger, and as a result, the earth pressure coefficient becomes smaller, and the earth pressure acting on the corner retaining wall A can be reduced.

〔Effect of the invention〕

As mentioned above, in the present invention, soil is added to the back soil.
Alternatively, mesh plates are arranged to increase the resistance between soil particles, so the internal friction angle of the back soil can be increased by increasing the resistance, reducing the earth pressure acting on the corner retaining wall. I can do it. As a result, the degree of safety against sliding of the corner retaining wall can be increased, and the ground reaction force is also reduced, so the degree of safety against overturning is also increased.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a construction example of the first invention, and FIGS. 2 and 3 are sectional views thereof. Fourth
The figure is a plan view showing a construction example of the second invention,
FIG. 5 is a sectional view thereof. A...Corner retaining wall, 1...Bottom plate, 2...Mesh plate, 3...Pin, 4...Wire, 5...
Pile.

Claims (1)

[Scope of Claims] 1. A mesh plate having a large number of holes in the direction of the resultant force of earth pressures applied to each wall surface on the back soil side of the bottom slab of a corner retaining wall that is integrally configured with wall surfaces and bottom slabs in two directions. A method for preventing slippage of a retaining wall at a corner, characterized by arranging the retaining walls so that their central axes in the longitudinal direction coincide with each other, increasing the internal friction angle of the back soil placed on the mesh plate, and reducing the soil pressure coefficient. . 2. A mesh plate with a large number of holes is installed in the soil above the bottom plate of the corner retaining wall, which is constructed by integrally forming the walls and the bottom plate in two directions, in the direction of the resultant force of the earth pressure applied to each wall. A method for preventing slipping of corner retaining walls, which is characterized by aligning the central axes and arranging multiple stages at intervals toward the upper layer, increasing the internal friction angle of the back soil placed on top of the stages, and reducing the soil pressure coefficient. Method.