JPH07252839A - Reinforced earth structure - Google Patents

Abstract

PURPOSE:To provide a reinforced earth structure having stable strength and capable of improving the execution property and economical efficiency. CONSTITUTION:Multiple retaining wall blocks 1 are stacked while a fill material 2 is filled at the back section of the retaining wall blocks 1 and reinforcing members 3 are fixed in the fill material 2. The retaining wall block 1 is molded into a self-sustainable, e.g., rectangular solid shape, and the upper and lower retaining wall blocks 1 are connected with coupling keys constituted of coupling holes 6 formed on one of the upper and lower retaining wall blocks 1, 1 and lug sections 4 formed on the other retaining wall block 1 and coupled with the coupling holes 6. End sections of the reinforcing members 3 are coupled with recesses 10 formed on the contact faces of the upper and lower retaining wall blocks 1, 1 and connected to the retaining wall blocks 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stacks a plurality of retaining wall blocks while filling the back surface of the retaining wall block with a filling material and fixing the retaining wall block in the filling material with a reinforcing member. The present invention relates to a reinforced soil structure constructed by.

[0002]

2. Description of the Related Art In the conventional reinforced earth method, 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. The retaining wall panel 20 is built up by filling the back surface of the retaining wall panel 20 with the filling material 21 and fixing the retaining material 22 in the filling material 21 one by one.

However, since the retaining wall panel 20 is not self-supporting as it is, and it is large and heavy, it is necessary to assemble it using a heavy machine such as a crane. Therefore, it is difficult to maintain the stability of the panel during construction, and the wall surface is difficult to maintain. However, there was a problem that it was easily deformed.

Further, in the reinforced earth construction method, in order to apply the tensile force of the reinforcement member 22 to the embankment layer from the principle,
It becomes possible only when elongation corresponding to the tensile force occurs.
Therefore, it is necessary that the wall surface does not collapse even if the reinforcing member 22 stretches.

However, in the conventional reinforced earthwork method in which a thin and large wall panel is used, when the reinforcing member 22 extends, the wall panel is easily cracked. Therefore, a geotextile having a large elongation such as a synthetic resin grit or a synthetic resin sheet cannot be used as a reinforcing member.

Recently, it has been considered that a concrete block which is more stable than a thin wall panel is used as the retaining wall block 23 (see FIG. 17), but this type of retaining wall block 23 is higher than the retaining wall panel. Since this is much lower (usually about 8 to 60 cm), the reinforcing member that is embedded in the embankment layer to fix this retaining wall block cannot be embedded in each block, and every multiple steps. There is no choice but to bury it.

Therefore, in order to effectively resist the retaining wall blocks that are not fixed by the reinforcing member against the earth pressure of the embankment layer, the retaining wall blocks should be stacked in the upper stage and thus gradually retracting. It is also considered to reduce the earth pressure by the method (see Fig. 17).

However, since the retaining wall blocks are not simply stacked and connected to each other, the line of action of the total load W of the retaining wall blocks passes inside the heel P of the lowermost retaining wall block. If so, each retaining wall block will be easily buried in the embankment layer side, and the retaining wall will be deformed,
Alternatively, there is a problem that the reinforcing member may come off or be broken.

The present invention has been made to solve the above problems. Even if a reinforcing member having a large elongation such as a synthetic resin grit or a synthetic resin sheet is used to support the retaining wall block. It is an object of the present invention to provide a reinforced soil structure which is not easily deformed or destroyed, is stable in strength, has good workability, and is excellent in economic efficiency.

[0010]

In the reinforced earth structure according to the first aspect of the present invention, a retaining wall block is formed into a shape capable of standing, and the upper and lower retaining wall blocks are connected by an engaging key. And, it is constructed by engaging the ends of the reinforcing member holding the retaining wall block with the recesses formed in the contact surfaces of the upper and lower retaining wall blocks and connecting them to the retaining wall block.

According to a second aspect of the present invention, there is provided a reinforced soil structure according to the second aspect, wherein the retaining wall blocks are stacked while retreating, and grit is used as a reinforcing member. Some of the retaining wall blocks are constructed without being connected to the reinforcing member.

[0012]

【Example】

Example 1. 1 to 4 show an embodiment of a reinforced earth structure according to the present invention, in which reference numeral 1 is a retaining wall block that is stacked in a plurality of stages to construct a retaining wall A, and 2 is a retaining wall A.
The embankment material that has been carefully packed and compacted on the back surface of No. 3, and the reference numeral 3 is a reinforcing member that fixes each retaining wall block 1 in the embankment material 2.

The retaining wall block 1 is made of concrete reinforced with steel bars or the like, and is formed into a rectangular parallelepiped shape that can stand alone in a stable state as it is.

Further, a plurality of engaging keys made of reinforcing steel or the like, that is, projections (dowels) 4 are provided on the upper end surface of each retaining wall block 1, and the projections 4 have a predetermined depth around the projections 4. The recess 5 is formed.

On the lower end surface of the retaining wall block 1,
An engagement hole 6 is formed in which the protrusion 4 of the retaining wall block 1 located on the lower side is engaged.

The upper and lower retaining wall blocks 1 and 1 are connected so that the protrusion 5 is engaged with the engaging hole 6 so as not to laterally shift. In addition, the retaining wall block 1 is formed by stacking so that the joint portions between the retaining wall blocks 1 and 1 that are adjacent to each other on the left and right sides are not continuous in the vertical direction and are alternately shifted to the left and right, that is, a so-called blurred joint The strength is being improved.

The retaining wall block 1 usually has a height of 8 to 8 in consideration of ease of handling such as transportation and workability.
It is preferably molded to have a size of 60 cm, a width of 15 to 80 cm, a depth of about 15 to 150 cm, and a weight of about 100 kg.

As the reinforcing member 3, there is used a so-called reinforcing bar grit, which is constituted by arranging a plurality of vertical reinforcing bars and horizontal reinforcing bars in a grid pattern and integrally welding the contact points thereof.
At the tip of the vertical reinforcing bar, insert it into the concave portion 5,
U-shaped hook 3a or ring 3b capable of engaging with
(See FIG. 4) are formed.

The reinforcing member 3 is embedded in the embankment material 2 in a plurality of layers, and the hook 3a or ring 3b at the tip is inserted into the recess 5 of the retaining wall block 1 to engage with the protrusion 4. By doing so, it is connected to the retaining wall block 1.

Further, the reinforcing member 3 is connected to two or three or more retaining wall blocks 1,1 which are laterally adjacent to each other, whereby the retaining wall block 1 is embedded in the backing material 2. Fixed and laterally adjacent retaining wall blocks 1,
1s are connected to each other.

The reinforcing member 3 does not have to be connected to each of all the retaining wall blocks 1 and a sufficient pull-out resistance force against the earth pressure of the embankment material 2 acting on the retaining wall blocks 1 can be obtained. If it is possible, it may be installed in every plural stages. Rather, it is more economical to have fewer reinforcing members 3,
Further, it does not hinder the rolling of the embankment material 2 and is preferable in construction. Usually, the installation interval of the reinforcing member 3 is 0.5-
About 1.5 m intervals are preferable.

Example 2. 5 to 7 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 7 is a retaining wall block which is stacked in a plurality of stages to construct the retaining wall A, and 8 is embedded in the embankment material 2 and is a reinforcement for fixing the retaining wall block 7 in the embankment 2 so as not to move. A member, and reference numeral 9 is a connecting member that connects the reinforcing member 8 to the retaining wall block 7.

Like the retaining wall block 1, the retaining wall block 7 is made of concrete reinforced with reinforcing bars or the like, and is formed into a rectangular parallelepiped shape that can stand in a stable state as it is.

Further, a plurality of protrusions (doughs) 4 made of a reinforcing bar or the like are projected on the upper end surface of each retaining wall block 7, and a recess 10 having a predetermined depth is laterally provided on the tip side thereof. Slits 11 having a predetermined depth are formed inside the recess 10 at right angles to the recess 10 and continuously with the recess 10 at predetermined intervals.

Further, the lower end surface of the retaining wall block 7 is formed with an engaging hole 6 into which the protrusion 4 of the retaining wall block 7 located on the lower side is engaged.

The upper and lower retaining wall blocks 1 and 1 are connected so that the protrusions 4 are engaged with the engaging holes 6 so as not to laterally shift.

Geotextile is used for the reinforcing member 8. The reinforcing member 8 is embedded in a plurality of layers in the filling material 2, and the reinforcing member 8 is provided on the upper surface of the retaining wall block 1.
The recesses 10 are formed so as to fit the mesh of the geotextile.

The geotextile as the reinforcing member 8 may be connected to the retaining wall block 7 by engaging the end of the geotextile with the recess 10, and the mesh-like connecting member of the end of the geotextile may be used. 9 or insert the end of the geotextile around the connecting member 9,
The end portion of the geotextile as the reinforcing member 8 may be connected to each retaining wall block 7 by fitting the connecting member 9 into the recess 10 of the retaining wall block 7.

Further, the reinforcing member 8 and the connecting member 9 are installed so as to straddle between two or three or more retaining wall blocks 7 and 7 which are laterally adjacent to each other, whereby the retaining wall block 7 is formed. The retaining wall blocks 7 and 7 which are fixed in the embankment material 2 on the back side and which are laterally adjacent to each other are connected so as not to separate from each other.

Example 3. FIG. 8 also shows another embodiment of the reinforced soil structure according to the present invention, and in Examples 1 and 2, the embankment material acting on the retaining wall block 1 (retaining wall block 7 in Example 2). In order to reduce the earth pressure of 2, it is stacked on top and therefore gradually retracted.

In this case, simply by stacking the retaining wall blocks 1 while retracting them, the line of action of the total load W of the retaining wall blocks 1 is the heel P of the retaining wall blocks 1 at the lowermost stage.
Since the retaining wall block 1 passes through the inside of the retaining wall block 1, the retaining wall block 1 is likely to be buried in the embankment material 2 side, and the stress is concentrated on the abutting portions of the upper and lower retaining wall blocks 1 and 1, so that the retaining wall surface is deformed, or Although the reinforcing member 3 (reinforcing member 8 in the second embodiment) may come off or break, in this embodiment, the retaining wall block 1 is formed into a rectangular parallelepiped shape that can stand in a stable state even if it is left as it is. The upper and lower retaining wall blocks 1 and 1 are firmly connected to each other by the engagement of the engagement key composed of the engagement protrusion 4 and the engagement hole 6, and the reinforcing member is formed on the contact surface of the upper and lower retaining wall blocks. Since the recesses 10 are engaged with each other, the upper and lower retaining wall blocks 1 and 1 have a large frictional resistance at their contact surfaces and are unlikely to be displaced from each other even when subjected to a large earth pressure.

Moreover, since the reinforcing member 8 is directly connected to the contact surfaces of the upper and lower retaining wall blocks 1 and 1, the embankment material on the back surface of the block is restrained by the reinforcing member 8 and a large earth pressure is applied to the retaining wall block 1. Therefore, the retaining wall block 1 is less likely to be displaced and stable.

If the reinforcing member 8 is not engaged with the recess 10 but directly with the contact surfaces of the upper and lower retaining wall blocks 1 and 1, the upper and lower retaining wall blocks 10 depend on the thickness of the reinforcing member 8.
The friction effect due to the contact is not obtained, and the retaining wall block 1 is easily disengaged due to the earth pressure on the back surface and the expansion of the reinforcing member 8, and the wall surface cannot be stabilized.

Example 4. FIG. 9 shows an example in which the retaining wall block 1 has a protrusion (engagement key) 1a, and FIG. 10 shows a cross section of a retaining wall constructed by combining the retaining wall blocks 1.

In this embodiment, the upper and lower retaining wall blocks 1 and 1 are connected by the protrusion 1a. The protrusion
Instead of 1a, a recess may be formed to serve as an engagement key.

It is also possible to use a retaining wall block having a space portion 1b for vegetation as shown in FIG.

[0038]

Since the present invention is constructed as described above, it has the following effects.

The retaining wall block that is stacked while filling the back surface with the embankment material and fixing it in the embankment material with the reinforcing member is sufficiently self-supporting as it is, for example, formed into a rectangular parallelepiped shape, and Since the upper and lower retaining wall blocks are connected by the engagement key provided on the contact surface, the retaining wall block is extremely stable during and after construction, and is easy to construct, and the retaining wall block This has the effect of preventing deformation of the wall surface due to movement or the like.

Since the retaining wall block is self-supporting and is extremely small in size, even if the reinforcing member in the embankment extends, the stress concentration is relieved by a slight displacement of the block, and there is no risk of the wall surface collapsing. .

Therefore, there is an effect that a sheet or a grit having an excellent embankment holding ability can be used as the reinforcing member.

Since a mountain-shaped retaining wall block is used,
It is stable without connecting a reinforcing member to each retaining wall block, and even if some displacement occurs due to that, earth pressure is rather reduced, and large displacement or destruction of the wall surface does not occur (Fig. 12 ~ (See Figure 15).

In FIG. 3, the reinforcing member is embedded in the embankment up to the fixing area, and the reinforcing member is embedded in the embankment on the back of the retaining wall block for stability and reinforcement during construction.

Since the reinforcing member is engaged with the concave portion formed on the contact surface of the upper and lower retaining wall blocks, a large friction resistance is obtained on the contact surface of the upper and lower retaining wall blocks, so that the upper and lower retaining wall blocks are large. Even if earth pressure is applied, they do not shift from each other.

Moreover, since the reinforcing members are directly connected to the contact surfaces of the upper and lower retaining wall blocks, the embankment on the back surface of the block is restrained by the reinforcing material, and therefore the embankment on the rear surface of the block is applied to the retaining wall block as a large earth pressure. Since it does not act, the retaining wall block is less likely to be displaced, and the effect is stable.

Further, in order to reduce the earth pressure of the embankment material against the retaining wall block, the upper and lower retaining wall blocks are connected by the engagement key even if the retaining wall blocks are stacked while being gradually retracted, and the upper and lower retaining wall blocks are connected. Since the reinforcing member is engaged with the recess formed in the contact surface of the block, it is possible to prevent the retaining wall block from being buried in the embankment material side, or the reinforcing member being cut due to stress concentration.
It is effective in providing a reinforced soil structure that is extremely stable in strength.

Further, the connection between the retaining wall block and the reinforcing member (see FIGS. 12 to 15) is extremely simple, and the tensile force generated in the reinforcing member can be evenly distributed to the retaining wall block. There is an effect that the cost can be reduced and it is possible to make it difficult to break.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing 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.

FIG. 3 is a perspective view of a retaining wall block.

FIG. 4 is a perspective view of a reinforcing member.

FIG. 5 is a partial perspective view showing another embodiment of the reinforced soil structure according to the present invention.

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

FIG. 7 is a perspective view of a retaining wall block.

FIG. 8 is a partial perspective view showing another embodiment of the reinforced soil structure according to the present invention.

FIG. 9 is a perspective view of another retaining wall block.

10 is a partial vertical cross-sectional view of a reinforced soil structure constructed by the retaining wall block shown in FIG.

FIG. 11 is a perspective view of another retaining wall block.

FIG. 12 is a partial vertical cross-sectional view of a retaining wall block.

FIG. 13 is a partial vertical cross-sectional view of a retaining wall block.

FIG. 14 is a partial vertical cross-sectional view of a retaining wall block.

FIG. 15 is a partial vertical cross-sectional view of a retaining wall block.

FIG. 16 is a vertical sectional view showing an example of a conventional reinforced soil structure.

FIG. 17 is a vertical cross-sectional view showing an example of a conventional reinforced soil structure.

[Explanation of symbols]

1 ... Retaining wall block, 2 ... Embankment material, 3 ... Reinforcement member, 4 ...
Projection portion, 5 ... Recessed portion, 6 ... Engagement hole, 7 ... Retaining wall block, 8
... Reinforcing member, 9 ... Connecting member, 10 ... Recess, 11 ... Slit.

Claims (2)

[Claims] 1. Reinforcement soil constructed by stacking a plurality of retaining wall blocks while filling a back surface of the retaining wall block with a filling material and fixing the filling material in the filling material with a reinforcing member. In the structure, the retaining wall block is formed into a self-sustaining shape, and the upper and lower retaining wall blocks are connected by an engagement key, and the reinforcing member has its end portion on the contact surface of the upper and lower retaining wall blocks. A reinforced earth structure characterized by being connected to the retaining wall block by engaging in a formed recess. 2. The retaining wall blocks are stacked while retracting, grit is used for a reinforcing member, and some of the retaining wall blocks are not connected to the reinforcing member. Reinforced soil structure described in paragraph.