JPH11200396A - Input seismic force reducing construction utilizing landslide protection wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reutualize a landslide protection wall by placing a number of elastic bodies between the protection wall and an underground skeleton and backfilling earth and sand thereby reducing seismic force by the expansion resistance of elastic bodies and frictional resistance between earth and sand particles. SOLUTION: A landslide protection wall 1 is built, its inner side is excavated, and an underground concrete skeleton 20 is constructed. Thereafter, a number of elastic bodies 7a are arranged between the landslide protection wall 1 and the underground skeleton 20, and earth and sand 14 is backfilled thereby creating a seismic force reducing structure. The elastic bodies 7a are made by forming rubber, urethane, foamed styrene or the like to circular shape, quadrangle or long-sized slab shape. By doing this, if a seismic force acts to the landslide protection wall 1, the seismic force transmitted to the underground skeleton 20 can be damped by the expansion resistance of the elastic body 7a and friction resistance between particles due to the movement of earth and sand, by which the landslide protection wall 1 can be reclaimed effectively. Also, instead of using elastic bodies 7a, elastic bodies 7b each consisting of a spiral spring covered with a soft synthetic resin tube may be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input seismic force reduction structure using a retaining wall in the fields of construction and civil engineering.

[0002]

2. Description of the Related Art Heretofore, a space between a retaining wall and a concrete frame is backfilled with earth and sand in order to suppress deformation of the retaining wall when a beam is dismantled.

[0003]

As described above, the conventional retaining wall has only to be backfilled with earth and sand to suppress deformation.
Not reused for other purposes.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an object to reuse a mountain retaining wall that is backfilled with earth and sand to suppress deformation of the mountain retaining wall at the time of demolition of a girder for another purpose. I do.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an elastic body 7 made of a material having high elasticity is installed at a number of places between a retaining wall 1 and a concrete skeleton 20, and the retaining wall 1 and the concrete are provided. Around the elastic body 7 between the frames 20
An input seismic force reduction structure that backfills with earth and sand and uses a retaining wall.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 3 are diagrams for explaining an embodiment of the present invention.

In this embodiment, a wooden retaining wall 1 made of steel or the like is supported by a not-shown cutting beam or the like by a conventionally known method. Excavation of the ground inside the mountain retaining wall 1 and necessary treatment after the excavation are performed by a conventionally known construction method, and a concrete frame 20 is constructed inside the mountain retaining wall 1 to form a known drainage channel and waterproofing. Equipment will also be installed.

The distance between the retaining wall 1 and the concrete frame 20 constructed as an underground frame is approximately 50 cm.
It is formed to about 80 cm. An elastic body (7a) formed of rubber, urethane, foamed styrene, or the like, which is a material having high elasticity, is installed at many places between the retaining wall 1 and the concrete frame 20, as shown in FIG.

The elastic body (7a) is formed in a circular, square or long plate shape as shown in FIG. 3, and its thickness is determined by the distance between the retaining wall 1 and the concrete frame 20. In total, it is formed to be slightly thicker than about 50 cm to 80 cm.

The area of the elastic body (7a) (FIG. 3)
Is affected by the degree of flexibility of the elastic body (7a), but in this embodiment, the elastic body (7a) shown in FIG. The area of the elastic body (7a) to be viewed from the front is made larger.

Then, the elastic body (7a) shown in FIG.
In a range of about 1 m in width and 2 m in height of the retaining wall 1, about 12 places of a circular or square shape and about 8 places of a long plate-like form are equally allocated and installed.

Then, the periphery of the elastic body (7a) between the retaining wall 1 and the concrete skeleton 20 is backfilled with earth and sand 14 similar to the earth and sand which has conventionally been embedded between the retaining wall and the concrete skeleton. This is a seismic force reduction structure using a retaining wall.

In this embodiment, a mountain retaining wall 1 shown in FIG.
Is pressed by the input seismic force, and the concrete
When the distance between the retaining wall 1 and the concrete frame 20 is reduced, the elastic body (7a) is compressed and the soil 14 is pressed.

Then, most of the earth and sand 14 moves integrally with the concrete frame 20, but the earth and sand 14 around the elastic body (7a) moves outside the elastic body (7a) (the earth and sand in FIG. 1). 14 (side in contact with 14) is compressed and moves so as to enter the outside of the elastic body (7a).

When the reduced interval between the retaining wall 1 and the concrete frame 20 is increased, the reduced elastic body (7a) is also expanded, and the sediment 14 that has entered the outside of the elastic body (7a). Push back.

Therefore, the earth and sand 14 compresses the outside of the elastic body (7a) and moves into the outside of the elastic body (7a), and the earth and sand 14 enters the outside of the elastic body (7a). Is attenuated by frictional resistance between particles of the moving earth and sand 14.

The structure for reducing input seismic force according to the present embodiment has the following features:
Compared to those backfilled with only earth and sand, the degree of vibration damping is increased by about 10% to 30%, and the input seismic force acting on the underground outer wall of the concrete frame via the retaining wall is reduced by 10% to 30%. It can be reduced to a degree.

FIG. 2 and FIG. 4 are views for explaining another embodiment of the present invention. In this embodiment, the same parts as those in the previous embodiment are denoted by the same reference numerals, and description thereof is omitted. The description of the same operation is omitted.

In this embodiment, an elastic body (7b) is provided as shown in FIG.
As shown in the figure, the spring is formed by a spiral spring. And the elastic body (7b) formed by this spiral spring is
It is covered with a coating 8 formed in a cylindrical shape with a flexible synthetic resin.

Then, the retaining wall 1 shown in FIG. 2 is pressed by the seismic force, moves to the side of the concrete frame 20, compresses the elastic body (7b), presses the earth and sand 14, and presses the concrete frame. Move 20.

Then, a part of the earth and sand 14 presses the coating 8 and enters the inside of the elastic body (7b). However, when the pressing force of the retaining wall 1 is reduced, the elastic body (7b) causes the retaining wall 1 to be in contact with the elastic retaining member 1. The space between the concrete skeletons 20 is expanded, the coating 8 also extends and comes out of the elastic body (7b), and the earth and sand 14 is drawn out of the elastic body (7b).

[0022]

According to the present invention, the elastic members 7 are installed at many places between the retaining wall 1 and the concrete frame 20, and the surroundings of the elastic members 7 are backfilled with earth and sand 14.

Therefore, according to the present invention, the retaining wall 1 is pressed by the input seismic force and moves to the side of the concrete frame 20, the distance between the retaining wall 1 and the concrete frame 20 is reduced, and the elastic body 7 is compressed. At the same time, when the soil 14 is pressed, the soil 14 around the elastic body 7 compresses the outside of the elastic body 7 and moves so as to enter the outside of the elastic body 7.

When the reduced distance between the retaining wall 1 and the concrete frame 20 is increased, the reduced elastic body 7 is also expanded and pushes back the sediment 14 that has entered the outside of the elastic body 7.

Therefore, according to the present invention, the input seismic force can be attenuated by the frictional resistance between the particles of the earth and sand 14 when the earth and sand 14 reciprocate to the elastic body 7 and the internal resistance when the elastic body 7 expands and contracts. And the mountain retaining wall 1 can be used effectively.

[Brief description of the drawings]

FIG. 1 is a sectional view for explaining an embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining another embodiment of the present invention.

FIG. 3 is a diagram showing an installation state of three types of elastic bodies for explaining one embodiment of the present invention;

FIG. 4 is a view showing an installation state of an elastic body for explanation of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mountain retaining wall 7 ・ 7a ・ 7b Elastic body 8 Coating 14 Earth and sand 20 Concrete frame

Claims (1)

[Claims] An elastic body made of a material having high elasticity is provided at a number of places between a retaining wall and a concrete frame.
Along with the retaining wall 1 and concrete frame 2
An input seismic force reduction structure using a mountain retaining wall in which the periphery of the elastic body 7 between 0 is filled with earth and sand 14.