JPH08134913A - Soil retaining method - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to construct a retaining wall that can reduce the external force acting on the retaining wall instead of the earth anchor. [Structure] The retaining wall 1 is provided with a retaining wall 2 projecting to the back side, and the retaining wall 2 is formed along the peripheral surface of the retaining wall 1 at appropriate intervals. The retaining wall 2 is provided vertically from the upper end to the lower end of the soil retaining wall 1, and the lower end is formed to a position deeper than the bottom surface 4 on the excavation side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil retaining method for excavation work such as root cutting.

[0002]

2. Description of the Related Art Generally, in excavation work having a wide excavation area and a deep excavation depth, as shown in FIG. 5, an earth retaining wall 10 composed of a continuous underground wall is constructed around the excavation area to retain soil around the ground. Are doing. The earth retaining wall 10 has a flat plate structure, and in order to prevent the earth retaining wall 10 from falling, the cutting beam 11 is installed on the inner front surface or a ground anchor is installed on the rear ground.

When the excavation depth increases, the earth pressure acting on the retaining wall 10 increases dramatically, so that 3 to 4
A girder 11 is installed for each excavation of m. Therefore, in the design of the retaining wall 10, the external force acting on the retaining wall 10 becomes maximum in the excavated state immediately before the installation of the truss 11. Therefore, when the earth retaining wall 10 is provided with an earth anchor, it is possible to reduce the external force acting on the soil retaining wall 10 due to its deterrent effect.

[0004]

However, providing the earth anchor on the earth retaining wall has a problem that it is economically expensive and it takes time to construct the earth anchor.

The present invention has been made in view of the above problems, and an object thereof is to construct a retaining wall having a function capable of reducing an external force acting on the retaining wall on the same principle as that of an earth anchor. It is to be.

[0006]

The earth retaining method of the present invention for solving the above problems is to construct a soil retaining wall consisting of a continuous underground wall around an excavation area in excavation work and In the earth retaining method for retaining earth, at the same time as the construction of the retaining wall, a retaining wall is projected on the back side of the retaining wall, and the retaining wall is constructed at appropriate intervals along the peripheral direction of the retaining wall. The retaining wall is formed along the depth direction of the retaining wall, and the retaining wall is formed so that the tip side is wide.

[0007]

According to the present invention, the retaining wall is constructed at the same time as the retaining wall is projected at the same time as the retaining wall is constructed so that the retaining wall acts as an earth anchor, so that the external force acting on the retaining wall during excavation is reduced. Therefore, the amount of deformation of the retaining wall at the time of excavation can be made smaller than in the case where there is no buttress. Therefore, it is possible to increase the installation interval of the beams.

Further, since the retaining walls are constructed at appropriate intervals along the peripheral direction of the retaining wall and are formed along the depth direction of the retaining wall, the retaining wall is reinforced so that the retaining wall is retained. The rigidity of the wall increases.

Further, since the retaining wall is in close contact with the ground, the looseness of the ground is suppressed and the subsidence of the surrounding ground is reduced.

Further, since the adhesive force between the retaining wall and the ground resists an external force such as a dynamic earth pressure on the retaining wall, the structure is less likely to be destroyed than when there is no retaining wall.

Further, since the retaining wall is formed wide at the tip side, the action of the retaining wall as an earth anchor can be increased, so that the external force acting on the retaining wall during excavation is further reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of the retaining wall, and FIG. 2 is a transverse sectional view thereof.

FIG. 1 is a sectional view showing a state in which the inside of the earth retaining wall 1 of the present invention is excavated and a cutting beam 3 is installed. Earth retaining wall 1
Has a retaining wall 2 protruding toward the back side, and the retaining wall 2 is formed along the peripheral surface of the retaining wall 1 at appropriate intervals.

As shown in FIG. 1, the retaining wall 2 is provided vertically from the upper end to the lower end of the soil retaining wall 1. The lower end of the retaining wall 2 is formed to a position deeper than the bottom surface 4 on the excavation side, so that the portion a in FIG. 1 resists the soil retaining wall 1 from falling.

Since the adhesive force between the retaining wall 2 and the ground 5 resists an external force acting on the retaining wall 1, the retaining wall 1
Prevent deformation of the.

The projecting length of the retaining wall 2 is set according to the distance to the adjacent site boundary, and is shortened when the retaining wall 1 is constructed near the site boundary,
When building high-rise buildings, there is a considerable margin up to the site boundary, so a certain length can be secured.

FIG. 3 shows another embodiment of the buttress wall 2, in which the distal end portion of the buttress wall 2 is formed wide so as to strengthen the function of replacing the earth anchor. This is provided on all buttresses 2 in principle, but it is not limited to this and can be provided on every other buttresses 2, for example.

Next, an earth retaining method using this retaining wall will be described. First, build a retaining wall along the perimeter of the planned building site. In this construction, a plane T-shaped preceding excavation hole 6 is formed in the ground by an excavator such as a bucket shell at appropriate intervals, and this is one element.

A plane T-shaped front panel 7 is formed by inserting a plane T-shaped rebar cage into the preceding excavation holes 6 and placing concrete.

When the leading panel 7 is formed, a trailing excavation hole 8 is formed between the leading panels 7, and when the trailing panel is formed by the same method as described above, the back wall 2 is formed on the back side.
The soil retaining wall 1 in which is formed is formed.

In this way, the retaining wall 2 is formed at the same time as the earth retaining wall 1 and is in close contact with the backside natural ground 5. Further, since the retaining walls 2 are formed at appropriate intervals, they serve to suppress the looseness of the ground 5 on the back side, and the subsidence of the surrounding ground 9 is reduced.

When the plane T-shaped earth retaining wall 1 is formed in this manner, the inside of the earth retaining wall 1 is excavated and the abdomen 3a is cut at a predetermined depth.
The girder 3 is installed via the.

In the case of the retaining wall 1 without the retaining wall 2, the cutting beams 3 are installed every 3 to 4 m, for example.
In the case of the retaining wall 1 of the present invention, it is possible to install every 5 m. This is because the retaining wall 2 acts as an earth anchor to reduce the external force acting on the retaining wall 1.

[0024]

Since the retaining wall projects from the rear side of the retaining wall at the same time as the construction of the retaining wall, this retaining wall acts as an earth anchor, so that the external force acting on the retaining wall during excavation can be reduced. The amount of deformation of the retaining wall at the time of excavation can be made smaller than when there is no buttress. Therefore, it is possible to increase the installation interval of the beams.

Since the retaining walls are constructed along the peripheral direction of the retaining wall at appropriate intervals and are formed along the depth direction of the retaining wall, the retaining wall is reinforced.
The rigidity of the retaining wall is increased.

Since the buttress has a structure in which it is in close contact with the natural ground,
It is possible to suppress the loosening of the ground and reduce the subsidence of the surrounding ground.

Since the adhesive force between the buttress and the ground resists an external force such as the dynamic earth pressure on the retaining wall, the structure is less likely to be destroyed than when the buttress is not provided.

Since the retaining wall is formed wide at the tip end side, the function of the retaining wall as an earth anchor can be increased, so that the external force acting on the soil retaining wall during excavation is further reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a retaining wall.

FIG. 2 is a cross-sectional view of a retaining wall.

FIG. 3 is a cross-sectional view showing another embodiment of the retaining wall.

FIG. 4 is a plan view showing a construction method of a retaining wall.

FIG. 5 is a vertical sectional view of a conventional retaining wall.

[Explanation of symbols]

 1 retaining wall 2 retaining wall 3 girder 4 bottom surface of excavation side 5 ground 9 surrounding area

Claims (3)

[Claims] 1. An earth retaining method for constructing an earth retaining wall consisting of a continuous underground wall around an excavation area in excavation work and retaining soil around the earth retaining wall, simultaneously with the construction of the earth retaining wall,
An earth retaining method characterized in that a retaining wall is provided so as to project on the back side thereof, and the retaining wall is constructed at appropriate intervals along the peripheral direction of the retaining wall. 2. The earth retaining method according to claim 1, wherein the retaining wall is formed along a depth direction of the retaining wall. 3. The earth retaining method according to claim 1, wherein the retaining wall is formed so that the tip side is wide.