JPH07252840A - Reinforced earth structure - Google Patents

Abstract

PURPOSE:To reduce soil pressure by using lightweight blocks made of a foam synthetic resin material as cushioning blocks holding a fill layer. CONSTITUTION:A cushioning block 2 can hold a fill layer 1 in the stable state, it is made of a foam synthetic resin capable of absorbing the fill layer 1 when shrunk, and it is formed into a prescribed rectangular solid shape. A holding block 4 is fitted at the tip section of a fill reinforcing member 3, and it supports edge end sections of the upper and lower cushioning blocks 2, 2 not to be moved forward by the soil pressure of the fill layer 1. A surface block 5 is installed at the tip section of the cushioning block 2, and it is supported on the adjacent upper and lower holding blocks 4, 4 by upper and lower support pins 6, 6. A recess opened to the inside is formed between the adjacent upper and lower surface blocks 5, 5, and the holding block 4 is stored in it. When the fill layer 1 is rolled or soil pressure is applied after construction, the cushioning blocks 2 hold the fill layer 1 and are compressed, thus the soil pressure is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced soil structure capable of reducing earth pressure of an embankment layer and preventing deformation of a retaining wall due to subsidence of the embankment layer.

[0002]

2. Description of the Related Art In the conventional reinforced earth construction method, for example, a thin and large concrete panel is used as a retaining wall panel 20 for constructing a wall surface such as a retaining wall as shown in FIG. A filling material 21 is filled in the back surface of the filling material, and a reinforcing member 22 such as a reinforcing bar grit is placed in the filling material 21.
It is constructed by stacking while fixing each one.

[0003]

[Problems to be Solved by the Invention] However, the retaining wall panel 20
Is difficult to stand on its own, and since it is large and heavy, it needs to be assembled using heavy equipment such as a crane, so traffic is not convenient, especially in mountainous areas, and construction in difficult terrain is difficult. There were challenges.

Further, since the embankment reinforcing member 22 is integrally connected to the retaining wall panel 20, when the embankment material 21 is rolled,
Furthermore, when the embankment reinforcing member 22 sinks as the embankment material 21 sinks due to the passage of time after construction, the embankment reinforcing member 22
There are problems such that the retaining wall panel 20 is deformed due to the material 22 being strongly pulled toward the embankment material 21 side, or the connecting portion of the embankment reinforcing member 22 is cut.

Further, particularly in the conventional method, an excessive earth pressure is applied to the retaining wall panel 20 by the compacting earth pressure by a heavy machine when the embankment material 21 on the back of the concrete panel as the retaining wall panel 20 is compacted, and thereby the wall surface The tendency of displacement was extremely large.

Further, when a synthetic resin material such as geotextile is used as the embankment reinforcing member 22, a large elongation occurs until sufficient strength is exhibited, which causes displacement or breakage of the retaining wall panel 20. Therefore, there is a problem that a concrete panel cannot be used as the retaining wall panel 20.

The present invention has been made to solve the above problems, and reduces the earth pressure of the embankment layer, the subsidence of the embankment layer, the earth pressure and displacement of the compacted embankment, and the displacement of the embankment reinforcing member 22 due to the expansion. It is an object of the present invention to provide a reinforced soil structure capable of preventing the deformation and destruction of the retaining wall by eliminating the influence of the above.

[0008]

A reinforced soil structure according to the present invention is a buffer block which is stacked at a predetermined height on the tip of a bank layer which is rolled to a predetermined height while rolling and holds the bank layer. And embedded in multiple layers in the embankment layer,
The embankment reinforcement member is configured to reinforce the embankment layer and fix the buffer block, and a surface block installed at the tip of the buffer block.

[0009]

【Example】

Example 1. 1 to 3 show an embodiment of a reinforced soil structure according to the present invention. In the drawings, reference numeral 1 is an embankment layer laid at a predetermined height while carefully rolling, and 2 is this embankment layer 1. The buffer blocks 3 which are stacked in a plurality of steps at the tip of the pad and which absorb the earth pressure of the embankment layer 1 by holding and contracting the embankment layer 1 are deeply embedded in the embankment layer 1, and the embankment layer 1 moves, The embankment reinforcing members 5 that prevent sinking, runoff, and the like and fix the buffer block 2 to the tip of the embankment layer 1 via the holding block 4 are installed at the tip of the buffer block 2, respectively. The surface block covering the front surface of the holding block 4, and the reference numeral 6 is inserted into the small holes 4a and 5a formed so as to face the holding block 4 and the cover block 5, straddling both of them, and Four The surface block 5 is a support pin for supporting.

The buffer block 2 is capable of holding the embankment layer 1 in a stable state, and is capable of absorbing the earth pressure of the embankment layer 1 by contraction, for example, formed of a foamable synthetic resin material. It is formed in a rectangular parallelepiped shape with a predetermined diameter to facilitate handling such as transportation and stacking.

FIG. 3 (a) is a schematic view showing a state in which the lateral block earth pressure increases with the increase of the vertical load due to the rolling compaction or the top soil pressure, whereby the buffer block 2 is compressed. A slight lateral displacement of 1 significantly reduces lateral earth pressure.

[0012] Therefore, the increase in the top load is absorbed by the buffer block 2 and the surface block 5 is not displaced forward, and a stable reinforced soil structure is constructed.

The surface block 5 may be omitted and only the holding block 4 may be provided, or the holding block 4 may be sized so as to partially cover the buffer block 2. You may make it the size which covers the whole.

Further, as shown in FIG. 2, a combination of the holding block 4 and the surface block 5 may be used as the surface block.

That is, in this type of conventional reinforced soil structure, a thin concrete panel is used as a wall panel, and since the thin concrete panel supports earth pressure, the wall panel needs to be made of reinforced concrete having high strength. However, the stability during rolling was poor due to the difficulty of self-sustaining.

On the other hand, in the present invention, the buffer block 2 is held by the holding block 4, and
Since the buffer block 2 itself is stable, the holding block 4 (or the surface block) is the embankment reinforcing member 3
A simple structure such as a simple block may be used as long as it can be pulled out.

For example, even a simple holding block 4 as shown in FIG. 3 (b) has a sufficient effect and there is no fear of breaking. In addition, in this figure, since the holding block 4 is embedded in the buffer block 2, even if the holding block 4 is displaced in the vertical direction, the holding block 4 does not collide and break due to the compression of the buffer block 2. .

During the construction, the buffer block 2 in which the surface block 5 is fitted in advance can be used in the factory or on-site.

As the embankment reinforcing member 3, for example, a so-called reinforcing bar grit or the like, which is constituted by arranging a plurality of vertical reinforcing bars and horizontal reinforcing bars in a grid pattern and welding their contact points, is used. 3 is the upper and lower buffer block 2,
It penetrates between the two and reaches the surface of the buffer block 1.

As the embankment reinforcing member 3, in addition to the reinforcing bar grit, a belt-like reinforcing member, an anchor bar equipped with a pressure support plate, expanded metal, geotextile such as synthetic resin grit or sheet can be used. .

In particular, geotextiles that use a reinforcing member that exerts sufficient tensile force only after a large elongation has a large displacement until the strength is exerted. Although it could not be used, in the present invention, the wall portion is sufficiently adapted even when the reinforcing member extends, which is extremely useful.

The holding block 4 is attached to the tip of each embankment reinforcing member 3, and supports the edge portions of the upper and lower buffer blocks 2, 2 so that the buffer block 1 does not move forward due to the earth pressure of the embankment layer 1. is doing.

The surface block 5 is installed at the tip of each buffer block 2 and is adjacent to the upper and lower holding blocks 4, 4.
It is supported by upper and lower support pins 6,6.

In this case, the holding block 4 and the surface block 5 are supported so that they can freely move in the vertical direction and are not constrained in the vertical direction.

Further, a concave portion 7 opening inward is formed between the upper and lower surface blocks 5, 5, and the holding block 4 is accommodated in the concave portion 7.

The holding block 4 and the surface block 5
Is formed of a material having weather resistance, such as a PC member. Further, the surface of the surface block 5 is decorated by forming an uneven pattern as necessary.

In such a construction, when the embankment layer 1 is compacted or after construction, the buffer block 2 is compressed while holding the embankment layer 1 to reduce the earth pressure. Can be achieved.

Further, even when the embankment layer 1 is submerged when the embankment layer 1 is compacted or when the embankment layer 1 is submerged after construction, the buffer block 2 is compressed together with the subsidence of the embankment reinforcing member 3. The tip portion of the member 3 is not strongly pulled toward the embankment layer 1 side, so that the deformation of the retaining wall and the cutting of the embankment reinforcing member 3 are prevented.

Further, since the holding block 4 and the surface block 5 are connected to each other via the support pins 6 so as to be movable up and down and are not restrained at all, stress is exerted on the abutting portion of the holding block 4 and the surface block 5 ( The compressive force) does not concentrate, and crushing of the holding block 4 and the surface block 5 is avoided.

FIG. 3 (c) shows an example in which the buffer block 2 is formed in a trapezoidal cross section. By forming the buffer block 2 in this way, the embankment layer 1 is rolled by a heavy machine. Since the buffer block 2 is not pushed forward when the pressure is applied, the embankment layer 1 with which the back surface of the buffer block 2 is filled can be carefully compressed.

Further, FIG. 3D shows the upper and lower buffer blocks 2,
By providing step portions 2a, 2a that engage with each other on the abutting surface of 2, it is possible to make a reinforced earth structure with very little wall displacement.

FIG. 5 shows another arrangement example of the surface block 5.

Example 2. 6 to 8 show another embodiment of the reinforced soil structure according to the present invention. In the drawings, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 8 designates holding blocks 4 which are vertically adjacent to each other.
A connecting rod 4b continuously inserted into the upper and lower holding blocks 4 and connecting the upper and lower holding blocks 4, 4 is a guide hole through which the connecting rod 8 is formed.

The inner diameter of the guide hole 4a is formed slightly larger than the outer diameter of the connecting rod 8 so that each holding block 4 can be lowered together with the embankment reinforcing member 3 without being restrained by the connecting rod 8.

In such a structure, when the embankment layer 1 is compacted or after it is constructed, the buffer block 2 is compressed while holding the embankment layer 1 to reduce the earth pressure. Can be achieved.

Further, even when the embankment layer 1 is submerged when the embankment layer 1 is compacted or when the embankment layer 1 is submerged due to the passage of time after construction, the buffer block 2 shrinks together with the subsidence of the embankment reinforcing member 3.
The tip portion of the embankment reinforcing member 3 is not strongly pulled toward the embankment layer 1 side, so that the deformation of the retaining wall and the cutting of the embankment reinforcing member 3 are prevented.

The embankment layer in the present invention can be constructed by a soil containing a solidifying material, a curable fluid such as a lightweight mortar, etc. in addition to the earth and sand.

If necessary, the surface can be vegetated.

[0040]

The present invention is constructed as described above, and an extremely light block made of a foamable synthetic resin material or the like is used as a buffer block which is stacked on the tip of the embankment layer and holds the embankment layer. Therefore, there is an effect that it is easy to transport and install, and the workability is good.

Further, when the embankment layer is compacted or after the construction, the buffer block contracts while retaining the embankment layer, so that the earth pressure can be reduced.

Further, even when the embankment layer is submerged during rolling of the embankment layer or with the passage of time after construction, the buffer block shrinks as the embankment reinforcing member subsides. The tensile stress is not concentrated, so that there is an effect that deformation of the surface layer portion of the reinforced soil structure, buckling failure and damage due to stress concentration can be prevented.

Further, the surface block provided at the tip of the buffer block is provided with various concave and convex patterns depending on the location, so that the decorative property can be enhanced.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a reinforced soil structure according to the present invention.

FIG. 2 is a vertical cross-sectional view of the reinforced soil structure shown in FIG.

3 (a), (b), (c), and (d) are partial vertical cross-sectional views of stacked buffer blocks.

FIG. 4 is an enlarged view of part A in FIG.

FIG. 5 is a front view showing another arrangement method of the front panel.

FIG. 6 is a partial front view of another embodiment of the reinforced soil structure according to the present invention.

7 is a partial vertical cross-sectional view of the reinforced soil structure shown in FIG.

FIG. 8 is an enlarged view of part A in FIG.

FIG. 9 is a vertical sectional view showing an example of a conventional reinforced soil structure.

[Explanation of symbols]

1 ... Embankment layer, 2 ... Buffer block, 3 ... Embankment reinforcing member, 4 ... Holding block, 5 ... Surface block, 6 ... Support pin, 7 ... Recess, 8 ... Guide rod.

Claims (1)

[Claims] 1. A buffer block, which is stacked at a predetermined height at a tip portion of a fill layer which is rolled to a predetermined height while rolling, and which holds the fill layer, and is embedded in a plurality of layers in the fill layer, A reinforced soil structure comprising: a reinforced embankment member that reinforces the embankment layer and fixes the buffer block; and a surface block installed at the tip of the buffer block.