JP7149168B2 - Anchor reinforced earth wall structure - Google Patents

Description

The present invention relates to a reinforced earth wall constructed by filling the back side of a wall body formed by arranging a plurality of wall materials vertically and horizontally with embankment. is related to the anchor reinforced earth wall structure.

Typical reinforced earth wall construction methods include the Terre Armé method, which attaches a wide band steel resistance material to the back of each wall material, the Geotextile construction method, which attaches a sheet-like resistance material such as a wire mesh to the back of the wall body, and each wall material. A multi-anchor construction method, etc., in which anchors having a bearing pressure resistance function are attached to the back side of the anchor are known. In addition, the steel strip resistance material used in the Terre Armé method, the planar resistance material used in the Geotextile method, and the anchors used in the multiple anchor method are placed in the embankment filled on the back side of the wall body. By being embedded, it exhibits pull-out resistance.

By the way, the object of the present application is an anchor-reinforced earth wall structure constructed by the multi-anchor construction method among the above-mentioned reinforced earth wall construction methods. Incidentally, as a conventional example of this type of anchor-reinforced earth wall structure, there are those disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2012-211507 (Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2014-125778 (Patent Document 2). .

FIG. 14 shows a general (conventional example) anchor-reinforced earth wall structure used, for example, when constructing a road on a mountain surface. In this conventional anchor-reinforced earthen wall structure, a plurality of wall materials 11A to 11D are arranged vertically and horizontally, and the back side of the wall body 1 is filled with embankment 2, while the wall materials 11A to 11D are placed on the back side. They are supported from the sides by anchors 3A to 3D, respectively. As the embankment 2 filled on the back side of the wall body 1, crushed stone may be used instead of soil.

The wall materials 11A to 11D are generally made of precast material, and their sizes are, for example, about 100 to 200 cm in width, 50 to 100 cm in height, and about 10 to 20 cm in thickness (thickness of the flat plate portion). are often used.

Each of the anchors 3A to 3D includes a connecting member 31 made of a long steel bar extending from the rear surface of each wall surface member 11A to 11D and a plate-shaped body ( It is composed of an anchor plate 32 mainly made of precast).

Various lengths of the connecting member 31 are used according to the depth of the embankment 2 portion. That is, the longer the connecting member 31 is used, the deeper the embankment 2 is located.

15 and 16, the anchor plate 32, for example, has a lateral width W1 of 30 cm, a height H1 of 30 cm, and a thickness (depth width) D1 of about 3 to 5 cm. The anchor plate 32 is fixed to the rear end of the connecting member (long steel bar) 31 in such a manner that the large area portion (front portion) faces the vertical direction. In addition, each anchor plate used in each anchor-reinforced earth wall structure of Patent Document 1 and Patent Document 2 below is also fixed at the rear end portion of the connecting member so as to face the vertical direction.

In the anchor-reinforced earth wall structure of FIG. 14, the back side of the wall body 1 is filled with the embankment 2, so that the connecting members 31 and the anchor plates 32 of the anchors 3A to 3D are buried in the embankment 2. is built with

By the way, in this type of anchor-reinforced earth wall structure (for example, FIG. 14), the embankment 2 portion is the front side slip area R1 that generates earth pressure in the horizontal direction against the wall body 1 (each wall surface material 11A to 11D). , and an immovable region R2 on the far side that generates pull-out resistance to the anchor plate 32, and the boundary between them becomes the slip surface S.

In this anchor-reinforced earth wall structure, a forward pressing force is generated on each of the wall surface members 11A to 11D of the wall body 1 by the earth pressure in the sliding region R1 on the front side of the sliding surface S in the embankment 2 portion. As a result, an action (withdrawal force F) that pulls the anchors 3A to 3D forward is generated. 32 serves as pull-out resistance and exhibits a support function for each of the wall materials 11A to 11D.

JP 2012-211507 A JP 2014-125778 A

By the way, in this type of anchor-reinforced earth wall structure (for example, FIG. 14), the position holding force of the embankment 2 with respect to the anchor plate 32 is the horizontal pull-out resistance received by the front surface of the anchor plate 32 via the connecting member 31. In addition, the pressing force due to the gravity of the embankment 2 (vertical earth pressure) against the anchor plate 32 is added. The range of the embankment 2 that functions as the position holding force for the anchor plate 32 is the vertical earth pressure applied to the area of the anchor plate 32 in plan view (the area of the horizontal width W1×the depth width D1 in FIG. 16). .

In the conventional anchor-reinforced earth wall structure (for example, FIG. 14), each anchor plate 32 embedded in the embankment 2 is fixed in a vertical direction, as shown in FIGS. 15 and 16. Therefore, the area (planar view area) of the anchor plate 32 that receives the gravity (vertical earth pressure) of the embankment 2 is a relatively small narrow area of thickness (depth width) D1×lateral width W1.

Therefore, the anchor plate 32 in the conventional (for example, FIGS. 14 to 16) anchor-reinforced earth wall structure receives the gravity (vertical earth pressure) of the embankment 2 because it is installed in a vertical posture (W1×D1 area) has become smaller, and the position holding force (pressing force from above) due to the gravity (vertical earth pressure) of the embankment 2 with respect to the anchor plate 32 has become smaller.

Therefore, in the present invention, each anchor plate is installed in a posture inclined upward toward the back side of the reinforcing earth wall (or each anchor plate is made of a slope plate inclined upward toward the back side of the reinforcing earth wall. In addition, by stacking each anchor plate in the same inclined posture, the area that receives the gravity of the embankment (vertical earth pressure) is effectively expanded, and the position retention force of the anchor plate by the embankment The purpose of the present invention is to provide an anchor -reinforced earth wall structure which is improved and facilitates the installation work when installing each of these anchor plates .

The present invention has the following configuration as means for solving the above problems.

[Invention of claim 1 of the present application]
According to the invention of claim 1 of the present application, a wall body (1) is formed by arranging a plurality of wall surface materials (11A to 11D) vertically and horizontally, and connecting members (31) are provided on the back side of each wall surface material (11A to 11D). Anchors (3A to 3D) consisting of anchor plates (32) fixed to connecting members (31) are connected continuously , and each anchor ( 3A to 3D) are buried in the embankment (2). In this case , for example , crushed stone may be used as the embankment filled on the back side of the wall body.

In the invention of claim 1 of the present application, in the same structure, each anchor plate (32) is made of a slanted slab (32a) inclined upward toward the inner side of the reinforcing earth wall, and the slanted slab (32a) 32a) is integrally formed with a support plate (32b) extending in the horizontal direction on the inner side of the reinforcing earth wall.

The angle at which the slope plate (32a) constituting each anchor plate (32) is inclined upward toward the depth side in the embankment of the reinforced earth wall is not particularly limited. It may be inclined upward in the range of about 45 degrees toward the back side.

In this way, when each anchor plate (32) is composed of a slanted plate (32a) installed in a state inclined upward toward the inner side of the reinforcing earth wall, the area of the anchor plate (32) in plan view is As it becomes larger, the amount of embankment applied as vertical earth pressure to the anchor plate (32) increases.

Then , the weight of the embankment placed on the upper surface of the inclined surface acts to tilt the upper portion of the anchor plate (32) further to the depth side. acts as an action to tighten (pull to the rear side) the connecting member (31) connected to the anchor plate (32) , and the front end of the connecting member (31) is applied to the wall material connecting It resists the forward pushing force (equivalent to the pull-out force against the anchor) due to the earth pressure of the embankment. Therefore, the pull-out resistance is increased, and the function of supporting the wall surface materials (11A to 11D) is improved.

By the way, each anchor plate (32) made of a slope plate (32a) inclined upward toward the inner side of the reinforcing earth wall has a large area and is heavy. Therefore, it is not easy to install the anchor plate (32) corresponding to each wall surface material (11A to 11D) so as to be inclined upward toward the inner side of the reinforced earth wall.

However, as described above, in the invention of claim 1 of the present application, the lower end portion of the slope plate (32a) constituting the anchor plate (32) is provided with a support extending in the horizontal direction on the inner side of the reinforcing earth wall. A plate (32b) is integrally formed. Therefore, it is self-sustaining, and can be maintained in a state of being inclined upward toward the inner side of the reinforcing earth wall by itself at the time of assembly. Therefore, the installation work becomes easier.

[Invention of claim 2 of the present application]
According to the invention of claim 2 of the present application, in the anchor-reinforced earth wall structure of the invention of claim 1, each anchor plate (32) made of a slanted plate (32a) is inclined upward toward the inner side of the reinforced earth wall. are stacked up and down with the same height as the wall surface materials (11A to 11D), and the abutting portions of the lower anchor plate (32) and the upper anchor plate (32) are engaged in the front-rear direction. An engagement portion (41) and an engagement receiving portion (42) are provided.

In this way, each anchor plate (32) made up of the slope plate (32a) has the same height as the wall surface members (11A to 11D) in a posture inclined upward toward the inner side of the reinforced earth wall. If the anchor plates (32) are stacked vertically, the plan view area of the anchor plates (32) in the state of being buried in the embankment (posture inclined upward toward the back side of the reinforced earth wall) becomes even larger, and each anchor plate ( 32), the amount of embankment applied as vertical earth pressure will also increase. Therefore, the pull-out resistance becomes higher, and the function of supporting the wall surface materials (11A to 11D) is further improved.

In addition, since each anchor plate (32) is vertically stacked in an upwardly inclined posture toward the inner side of the reinforcing earth wall, when constructing the upper anchor plate (32), the support plate (32b ) to place the upper anchor plate (32) on the lower anchor plate (32) for easy positioning. Therefore, installation is easy.

Moreover, in the same structure, the abutting portion between the vertically stacked lower anchor plate (32) and the upper anchor plate (32) is engaged with the engaging portion (41) that engages in the longitudinal direction. A receiving portion (42) is provided. By engaging with each other, misalignment during stacking is prevented. Therefore, in the same structure, when assembling, each anchor plate (32) can be appropriately stacked in a posture inclined upward toward the inner side of the reinforcing earth wall without being displaced from each other. .

[Invention of claim 3 of the present application]
According to the invention of claim 3 of the present application, a wall body (1) is formed by arranging a plurality of wall surface materials (11A to 11D) vertically and horizontally, and connecting members (31) are provided on the back side of each wall surface material (11A to 11D). Anchors (3A to 3D) consisting of anchor plates (32) fixed to connecting members (31) are connected continuously , and each anchor ( 3A to 3D) are buried in the embankment (2). In this case , for example , crushed stone may be used as the embankment filled on the back side of the wall body.

In the third aspect of the present invention , each anchor plate (32) in the anchor reinforced earth wall structure is installed in a posture inclined upward toward the inner side of the reinforced earth wall . The angle at which the anchor plate (32) is inclined upward toward the depth side in the embankment ( 2 ) is not particularly limited. It may be inclined upward.

The anchors (3A to 3D) used in the anchor-reinforced earth wall structure of the invention of claim 3 of the present application are composed of a connecting member (31) extending from the rear surface of the wall surface material (11A to 11D) to the inner side and the connecting member (31 ) and an anchor plate (32) made of a plate-like body (mainly made of precast) fixed to the rear end of the anchor plate (32) .

The connecting member (31) can connect the rear surface of the wall surface members (11A to 11D) and the front surface of the anchor plate (32) in a tensioned state, and reinforce the anchor plate (32) at the rear end of the connecting member (31) . It is sufficient if it can be supported in an upwardly inclined posture toward the back side of the earthen wall .

As the material of the connecting member (31) , steel (steel bar, narrow steel flat plate, steel wire, etc.), belt-shaped rope having high tension (for example, high strength fiber rope), etc. can be adopted. . In addition, when using a flexible belt-shaped rope as the connecting member (31) , the anchor plate (32) should be It is preferable to connect belt-like ropes to each of a plurality of locations. In that case, at least one belt-shaped rope is preferably connected to a position near the upper part of the anchor plate (32) (above the middle height position).

In the anchor-reinforced earth wall structure of the invention of claim 3 of the present application, the anchor plate (32) is placed in the embankment (2) filled on the back side of the wall body (1) toward the back side of the reinforced earth wall. Although the anchor plate (32) is installed in an inclined position, if the anchor plate (32) is installed in an upward inclined position toward the inner side of the reinforced earth wall, the area of the anchor plate (32) in a plan view is increased. As it becomes larger, the amount of embankment (2) applied as vertical earth pressure to the anchor plate (32) increases.

In addition, if the anchor plate (32) is installed in a posture inclined upward toward the inner side of the reinforced earth wall, the weight of the embankment (2) placed on the upper surface of the inclined surface will cause the upper part of the anchor plate (32) to move. The action of tilting the side further to the back side works, and this action of tilting to the back side works as an action of tightening (pulling to the back side) the connecting member (31) connected to the anchor plate (32) . Therefore, the forward pushing force of the embankment (2) against the wall surface materials (11A to 11D) connecting the front end of the connecting member (31) ( equivalent to the pull-out force for the anchors 3A to 3D ) will be resisted. Therefore, the pull-out resistance is increased, and the function of supporting the wall surface materials (11A to 11D) is improved.

Next, in the anchor reinforced earth wall structure of the invention of claim 3 of the present application, each anchor plate (32) is buried in the embankment (2) (in a posture inclined upward toward the inner side of the reinforced earth wall) . , The height of each wall surface material (11A to 11D) is the same as that of each wall surface material (11A to 11D ). are stacked on top of each other to form a continuous wall .

That is, each anchor plate (32) has the same height as the wall materials (11A to 11D) when buried in the embankment (2) ( inclining upward toward the inner side of the reinforced earth wall ). Therefore, the plan view area of the anchor plate (32) buried in the embankment (2) is further increased, and the amount of the embankment (2) applied to the anchor plate (32) as vertical earth pressure. becomes more and more.

In addition, since each anchor plate (32) is stacked up and down toward the back side of the reinforced earth wall in a posture inclined upward and downward to form a continuous wall, when the anchor plate (32) on the upper side is constructed, the lower side is installed. can be positioned by placing it on the anchor plate (32) .

Furthermore, in the anchor-reinforced earth wall structure of the invention of claim 3 of the present application, the abutting portions of the vertically stacked lower anchor plate (32) and upper anchor plate (32) are engaged with each other in the longitudinal direction. A misalignment prevention structure (4) comprising an engaging portion (41) and an engagement receiving portion (42) is provided.

According to such a configuration, the engaging portion (41) and the engaging receiving portion ( 41) that engage with each other in the front-rear direction at the abutting portions of the two vertically stacked anchor plates (32), (32) . 42) is provided, the vertically continuous anchor plates (32), (32) are appropriately stacked without being displaced , and the positional deviation prevention structure ( 4) is provided. In 4) , they mutually reinforce each other.

[Invention of claim 4 of the present application]
According to the invention of claim 4 of the present application, a plurality of wall surface materials (11A to 11D) are arranged vertically and horizontally to form a wall main body (1), and a connection member (31) is provided on the back side of each wall surface material (11A to 11D). Anchors (3A to 3D) consisting of anchor plates (32) fixed to connecting members (31) are connected continuously , and each anchor ( 3A to 3D) are buried in the embankment (2). In this case , for example , crushed stone may be used as the embankment filled on the back side of the wall body.

In the invention of claim 4 of the present application, each anchor plate (32) in the anchor-reinforced earth wall structure is installed in a posture inclined upward toward the inner side of the reinforced earth wall . The angle at which the anchor plate (32) is inclined upward toward the depth side in the embankment ( 2 ) is not particularly limited. It may be inclined upward.

The anchors (3A to 3D) used in the anchor-reinforced earth wall structure of the invention of claim 4 of the present application are composed of a connecting member (31) extending from the rear surface of the wall surface material (11A to 11D) to the inner side and the connecting member (31 ) and an anchor plate (32) made of a plate-like body (mainly made of precast) fixed to the rear end of the anchor plate (32) .

The connecting member (31) can connect the rear surface of the wall surface members (11A to 11D) and the front surface of the anchor plate (32) in a tensioned state, and reinforce the anchor plate (32) at the rear end of the connecting member (31) . It is sufficient if it can be supported in an upwardly inclined posture toward the back side of the earthen wall .

As the material of the connecting member (31) , steel (steel bar, narrow steel flat plate, steel wire, etc.), belt-shaped rope having high tension (for example, high strength fiber rope), etc. can be adopted. . In addition, when using a flexible belt-shaped rope as the connecting member (31) , the anchor plate (32) should be It is preferable to connect belt-like ropes to each of a plurality of locations. In that case, at least one belt-shaped rope is preferably connected to a position near the upper part of the anchor plate (32) (above the middle height position).

In the anchor-reinforced earth wall structure of the invention of claim 4 of the present application, the anchor plate (32) is placed in the embankment (2) filled on the back side of the wall body (1) toward the back side of the reinforced earth wall. Although the anchor plate (32) is installed in an inclined position, if the anchor plate (32) is installed in an upward inclined position toward the inner side of the reinforced earth wall, the area of the anchor plate (32) in a plan view is increased. As it becomes larger, the amount of embankment (2) applied as vertical earth pressure to the anchor plate (32) increases.

In addition, if the anchor plate (32) is installed in a posture inclined upward toward the inner side of the reinforced earth wall, the weight of the embankment (2) placed on the upper surface of the inclined surface will cause the upper part of the anchor plate (32) to move. The action of tilting the side further to the back side works, and this action of tilting to the back side works as an action of tightening (pulling to the back side) the connecting member (31) connected to the anchor plate (32) . Therefore, the forward pushing force of the embankment (2) against the wall surface materials (11A to 11D) connecting the front end of the connecting member (31) ( equivalent to the pull-out force for the anchors 3A to 3D ) will be resisted. Therefore, the pull-out resistance is increased, and the function of supporting the wall surface materials (11A to 11D) is improved.

Next, in the anchor reinforced earth wall structure of the invention of claim 4 of the present application, each anchor plate (32) is embedded in the embankment (2) (in a posture inclined upward toward the inner side of the reinforced earth wall) . , The height of each wall surface material (11A to 11D) is the same as that of each wall surface material (11A to 11D ). are stacked on top of each other to form a continuous wall .

That is, each anchor plate (32) has the same height as the wall materials (11A to 11D) when buried in the embankment (2) ( inclining upward toward the inner side of the reinforced earth wall ). Therefore, the plan view area of the anchor plate (32) buried in the embankment (2) is further increased, and the amount of the embankment (2) applied to the anchor plate (32) as vertical earth pressure. becomes more and more.

In addition, since each anchor plate (32) is stacked up and down toward the back side of the reinforced earth wall in a posture inclined upward and downward to form a continuous wall, when the anchor plate (32) on the upper side is constructed, the lower side is installed. can be positioned by placing it on the anchor plate (32) . Therefore, installation is easy.

Furthermore, in the anchor-reinforced earth wall structure of the invention of claim 4 of the present application, in addition to these, as each anchor plate (32), a wire net-like or grid-like mesh material (32d) is placed in the hard frame (32c). A sheet material (32B) having a function of blocking the passage of earth and sand is stretched on the front surface of the built -in planar mesh body (32A).

The anchor plate (32) having such a structure has a large number of spaces in the mesh material portion of the planar mesh body, so the weight is significantly lighter than that made of precast.

On the other hand, if the anchor plate (32) is only a planar mesh, earth and sand will pass through the space of the mesh material, so that the pull-out resistance function will be almost lost. The anchor plate (32) to be adopted has a sheet material with a function of preventing the passage of earth and sand stretched on the front surface of the planar mesh body, so it is assumed that the anchor plate (32) has a sufficient pull-out resistance function. Become.

As a result, according to the anchor-reinforced earth wall structure of each of the inventions of the present application, it is possible to realize an anchor-reinforced earth wall structure with high support strength of the wall surface material and easy assembly at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the anchor reinforcement earth wall structure of 1st Example of this invention. It is an enlarged view of the II part (anchor plate installation part) of FIG. 3 is a perspective view of FIG. 2; FIG. FIG. 10 is a longitudinal sectional view showing the anchor-reinforced earth wall structure of the second embodiment of the present invention; 5 is an enlarged view of a V portion (anchor plate installation portion) of FIG. 4. FIG. FIG. 6 is a partial perspective view of FIG. 5; FIG. 10 is a vertical cross-sectional view showing an anchor-reinforced earth wall structure of a third embodiment of the present invention; 8 is an enlarged view of the VIII portion (anchor plate installation portion) of FIG. 7. FIG. FIG. 9 is a partial perspective view of FIG. 8; It is explanatory drawing (perspective view of a planar mesh body and a sheet|seat material in a separated state) of the anchor plate used by the anchor reinforcement earth wall structure of 4th Example of this invention. FIG. 11 is a sectional view showing an anchor-reinforced earth wall structure of a fourth embodiment using the anchor plate of FIG. 10; 11. It is an enlarged view of the XII part (anchor plate installation part) of FIG. FIG. 13 is a partial perspective view of FIG. 12; It is a longitudinal cross-sectional view which shows the conventional general anchor reinforcement earth wall structure. 14. It is an enlarged view of the XV part (anchor plate installation part) of FIG. FIG. 16 is a perspective view of FIG. 15;

Several embodiments of the present application will be described below with reference to FIGS. FIGS. 4 to 6 show the anchor-reinforced earth wall structure of the second embodiment targeted for claims 1 to 3 of the present application, and FIGS. 7 to 9 show the third embodiment targeted for claims 1 to 3 of the present application. FIG. 10 to FIG. 13 show an anchor-reinforced earth wall structure of a fourth embodiment, which is intended for claims 1 to 2 and 4 of the present application.

[First embodiment in FIGS. 1 to 3]
FIG. 1 shows the anchor-reinforced earth wall structure of the first embodiment used, for example, when constructing a road on a mountain surface P. In the anchor-reinforced earth wall structure of the first embodiment, a plurality of wall materials A wall body 1 is formed by arranging 11A to 11D vertically and horizontally, and anchors 3A to 3D having connecting members 31 and anchor plates 32 are connected to the back side of each wall surface member 11A to 11D. The anchors 3A to 3D are embedded in the embankment 2 by filling the embankment 2 on the back side of the anchor.

The embankment 2 filled on the back side of the wall body 1 is generally made of soil, but crushed stone may be used instead of the soil.

The wall materials 11A to 11D used (exemplified) in FIG. It is of size. The material and size of each of the wall members 11A to 11D are not particularly limited, and can be changed in design within a range that does not impair the function.

The anchors 3A-3D are composed of a connecting member 31 extending from the rear surface of the wall surface members 11A-11D and an anchor plate 32 fixed to the rear end of the connecting member 31. As shown in FIG.

In the first embodiment shown in FIGS. 1 to 3, one steel bar 31a is used for one anchor plate 32 as the connecting member 31. As shown in FIG. The connecting member 31 (steel bar member 31a) can be fixed at its front end portion to the rear surface of the wall surface members 11A to 11D, and can be fixed to the anchor plate 32 at its rear end portion. Further, the connecting members 31 each have a predetermined length depending on the depth of the embankment 2 at the height at which the anchors are installed. That is, the connecting member 31 in each stage has a length that allows the anchor plate 32 fixed to the rear end portion of the connecting member 31 to be positioned in the immovable region R2 behind the slip surface S of the embankment 2, as will be described later. is used.

The anchor plate 32 used in the first embodiment is made of precast and has a size of, for example, an area of about 30 cm×30 cm and a thickness of 3 to 5 cm. The material and size of the anchor plate 32 are not particularly limited, and the design can be changed within a range that does not impair the function.

In the construction example shown in FIG. 1, as the wall body 1, wall materials are stacked in four stages (reference numerals 11A to 11D), and a predetermined number of wall materials are successively arranged side by side in the horizontal direction. Incidentally, the number of stacked stages of the wall materials 11A to 11D constituting the wall main body 1 is set depending on the construction site, but in reality there are many more (for example, there are many tiers of 10 or more).

In the construction example shown in FIG. 1, the wall surface materials 11A to 11D are continuously stacked up and down so that the wall main body 1 is a continuous wall, but the upper wall surface material is placed slightly behind the lower wall surface material. The wall body may be provided with a stepped portion and a flower bed provided on the stepped portion.

The anchor-reinforced earth wall structure of FIG. 1 is constructed by the following procedure.

First, the mountain surface P is excavated and removed to form a space Q, and a predetermined number of first step wall materials 11A are juxtaposed in the left-right direction at a position near the front end of the lower surface of the space Q (above the foundation 10). Set up and fix each with .

Next, the back side of the first step wall material 11A is filled with the first step embankment 2A up to the planned installation height (first step height) L1 of the first step anchor 3A (anchor plate 32). The first stage embankment 2A is sufficiently compacted by a roller compactor.

Next, the first stage anchor 3A composed of the connecting member 31 and the anchor plate 32 is installed on the first stage embankment 2A. It is fixed to the back surface of the material 11A, and the anchor plate 32 is fixed to the rear end portion of the connecting material 31 in an upwardly sloping posture on the far side. In addition, the anchor plate 32 is installed in the immovable area R2 behind the slip surface S of the embankment 2, as will be described later.

In this first embodiment, as shown in enlarged view in FIGS. 2 and 3, the central portion of the anchor plate 32 is attached to the rear end portion of the connecting member 31 (steel bar member 31a) by a predetermined angle A with the fixture 33. It is fixed in a posture that is tilted upwards. The depth side ascending inclination angle A of the anchor plate 32 is not particularly limited, but a range of, for example, about 20° to 45° is appropriate. Incidentally, in the illustrated example, the depth side ascending inclination angle A of the anchor plate 32 is set to 30°.

Next, after stacking the second stage wall material 11B on the first stage wall material 11A (the upper and lower wall materials are connected and fixed by an appropriate method), the second stage anchor 3B (anchor plate 32) is installed. The second stage embankment 2B is filled up to the planned height (second stage height) L2, and the second stage embankment 2B is compacted by a roller compactor.

Then, in the same manner, the second stage anchor 3B is installed on the second stage embankment 2B, the third stage wall material 11C is added on the second stage wall material 11B, and the third stage wall material 11C is added to the third stage height L3. Fill the 3-step embankment 2C, set the 3rd-step anchor 3C on the 3rd-step embankment 2C, add the final 4th-step wall material 11D on the 3rd-step wall material 11C, and increase the height of the 4th step. Fill the fourth stage embankment 2D up to L4, install the fourth stage anchor 3D on the fourth stage embankment 2D, and finally the fifth stage embankment to the upper end height L5 of the uppermost (fourth stage) wall material 11D. By filling 2E, the anchor reinforced earth wall structure of FIG. 1 can be completed.

Also in the anchor-reinforced earth wall structure of FIG. 1 (first embodiment), the embankment 2 portion is the front side slip area R1 that generates earth pressure in the horizontal direction against the wall body 1 (each wall surface material 11A to 11D). , and an immovable region R2 on the far side that generates pull-out resistance to the anchor plate 32, and the boundary between them becomes the slip surface S.

Also in this anchor-reinforced earth wall structure, a forward pressing force is generated on each of the wall surface members 11A to 11D of the wall body 1 by the earth pressure in the sliding region R1 on the front side of the sliding surface S in the embankment 2 portion. As a result, an action (withdrawal force F) that pulls the anchors 3A to 3D forward is generated. 32 serves as pull-out resistance and exhibits a support function for each of the wall materials 11A to 11D.

By the way, in the anchor-reinforced earth wall structure of FIGS. In addition to the pull-out resistance force, the pressing force due to the gravity of the embankment 2 (vertical earth pressure) against the anchor plate 32 is taken into account.

In the anchor-reinforced earth wall structure of the first embodiment, the area of the embankment 2 functioning as a position holding force with respect to the anchor plate 32 is the area of the anchor plate 32 in plan view (left and right width W2 in FIG. 3× As for the soil pressure in the vertical direction applied to the depth width D2), since the anchor plate 32 is installed in an upward tilted posture on the far side (the tilt angle A = 30° in the illustrated example), The amount of embankment 2 applied as vertical earth pressure is significantly greater than that in which the anchor plate 32 is installed in a vertical position as shown in FIGS. 14 to 16 (conventional example).

Therefore, in the anchor-reinforced earth wall structure of the first embodiment, the amount of embankment 2 acting as vertical earth pressure against the anchor plate 32 increases, thereby increasing the position holding force with respect to the anchor plate 32. do.

In addition, the weight of the embankment 2 placed on the inclined upper surface side of the anchor plate 32 acts to tilt the upper portion of the anchor plate 32 further toward the back side. It works as an action to pull it. Tightening (pulling to the depth side) the connecting member 31 in this way produces a forward pushing force due to the earth pressure of the embankment 2 against the wall surface members (11A to 11D) connecting the front ends of the connecting members 31. (corresponding to the pull-out force F against the anchor), the wall surface materials 11A to 11D can be held in a more stable posture.

[Second embodiment in FIGS. 4 to 6]
The second embodiment of FIGS. 4 to 6 shows modifications of the anchors 3A to 3D in the anchor-reinforced earth wall structure of the first embodiment.

In the anchor-reinforced earthen wall structure of the second embodiment (FIGS. 4 to 6), the anchor plates 32 of the respective anchors 3A to 3D are embedded in the embankment 2 (upward tilting posture on the deep side). 11D) and have the same width as the wall material. In addition, the side length of the anchor plate 32 is substantially longer than the side length of the wall surface materials (11A to 11D) because it is embedded in the embankment 2 in an upwardly inclined posture on the far side ( At an inclination angle A of 30°, the side length increases by about 15%).

The anchor plate 32 used in the second embodiment (FIGS. 4 to 6) is made of precast and has a simple flat plate shape. As shown in FIG. 6, the horizontal width W3 of the anchor plate 32 is set to be the same as the horizontal width of the wall material (for example, W3=100 to 200 cm).

In the anchor-reinforced earth wall structure of the second embodiment, the anchor plates 32 are stacked up and down at the height positions corresponding to the wall materials 11A to 11D, respectively, and are inclined upward to the back side to form a continuous wall. installed in the shape of In addition, when the anchor plate 32 is installed in the embankment 2 in an uphill posture on the back side, the height H3 in the vertical direction (see FIGS. 5 and 6) is the same as the height of each wall surface material 11A to 11D. .

In this second embodiment, a belt-shaped rope 31b of high strength is used as a connecting member 31 for connecting each wall surface member 11A to 11D and each anchor plate 32. As shown in FIG. The belt-like rope 31b can be, for example, a twisted wire made of high-strength fibers, and the belt-like rope 31b is flexible.

In order to stably support the anchor plate 32, a plurality of belt-like ropes 31b (four in the illustrated example) are used between the mutually facing wall members (11A to 11D) and the anchor plate 32 respectively. When four belt-like ropes 31b are used for one anchor plate 32, as shown in FIG. You should try to support it.

Since the anchor plate 32 used in the second embodiment has a large area and a large weight, there is a concern that the self-sustainability of the anchor plate 32 may be deteriorated when the anchor plate 32 is assembled in an upward inclined posture on the rear side. Therefore, in the second embodiment, the anchor plate 32, which is installed in the upwardly inclined posture on the far side, is supported from the far side by the support member 34 until the anchor plate 32 is supported by the belt-like ropes 31b. .

Furthermore, in the anchor-reinforced earth wall structure of the second embodiment, the engagement portion 41 and the engagement receiving portion that engage each other in the front-rear direction are provided at the abutting portion between the two vertically stacked anchor plates 32, 32. A misalignment prevention structure 4 consisting of 42 is adopted. 5 and 6, each anchor plate 32 is provided with a downward convex engagement portion 41 at its lower end, and an upward concave shape for receiving the engagement portion 41 at its upper end. are provided, and when the two anchor plates 32, 32 are stacked vertically, the engagement receiving portion 42 at the upper end of the lower anchor plate 32 and the engagement receiving portion 42 at the lower end of the upper anchor plate 32 He is trying for the engaging part 41 to engage mutually in the front-back direction.

The method of constructing the anchor-reinforced earthen wall structure of the second embodiment (FIGS. 4 to 6) is substantially the same as that of the first embodiment (FIGS. 1 to 3), so the description thereof will be used. 1 to 3 and the second embodiment shown in FIGS. 4 to 6 are denoted by the same reference numerals, which mean the same thing.

In the anchor-reinforced earth wall structure of the second embodiment, each anchor plate 32 has the same height as each corresponding wall surface material (11A to 11D) in the posture of being buried in the embankment 2 (upward inclined posture on the far side). As a result, the plan view area of the anchor plate 32 in the ground-buried state (the area of the left-right width W3×the depth width D3 in FIG. 6) is further increased, and as a result, the embankment is applied to the anchor plate 32 as vertical soil pressure. The amount of 2 is even greater.

In addition, when the plan view area of the anchor plate 32 (the area of the left-right width W3×the depth width D3 in FIG. 6) is increased, the amount of the embankment 2 applied to the anchor plate 32 as vertical soil pressure is further increased. The action of tilting the upper side of the plate 32 further to the depth side acts more strongly, which further tightens (pulls to the depth side) the connecting member 31 (especially the belt-like rope 31b on the upper side). Since this is a force against the wall surface materials (11A to 11D) against the forward pushing force (equivalent to the pull-out force F against the anchor) due to the earth pressure of the embankment 2, the larger the plan view area of the anchor plate 32, the more The stable attitude holding function for each of the wall surface materials 11A to 11D is increased.

[Third Embodiment in FIGS. 7 to 9]
The third embodiment of FIGS. 7-9 shows a modification of the anchor plate 32 in the anchor-reinforced earth wall structure of the second embodiment (FIGS. 4-6).

In the anchor-reinforced earth wall structure of the third embodiment, the anchor plate 32 is formed by integrally forming a support plate 32b extending inward and horizontally at the lower end of the inclined plane plate 32a inclined upward on the far side. is doing. The depth side extension length of the support plate 32b has a length that allows the anchor plate 32 to stand on its own on each installation surface while the slanted plate 32a is in the posture of being inclined upward to the depth side.

In the anchor-reinforced earth wall structure of the third embodiment, when assembling the anchors 3A to 3D of each stage, the support plates 32b of the anchor plates 32 are attached to the respective installation surfaces (upper surfaces of the embankments 2A to 2C of each stage, etc.). ), the anchor plate 32 can stand on its own, so that the assembling work of the anchors 3A to 3D is simplified.

Also in the anchor-reinforced earth wall structure of the third embodiment (FIGS. 7 to 9), the abutting portions between the two vertically stacked anchor plates 32, 32 are engaged with each other in the longitudinal direction. A misalignment prevention structure 4 consisting of a joint portion 41 and an engagement receiving portion 42 is employed. 8 and 9, each anchor plate 32 has an upwardly convex engaging portion 41 at its upper end, and an upwardly concave shape at its lower end for receiving the engaging portion 41. As shown in FIGS. When the two anchor plates 32, 32 are vertically stacked, the engaging portion 41 at the upper end of the lower anchor plate 32 and the engaging portion 41 at the lower end of the upper anchor plate 32 are arranged. The receiving portion 42 engages with each other in the front-rear direction.

The construction method of the anchor-reinforced earthen wall structure of the third embodiment (FIGS. 7 to 9) is substantially the same as that of the second embodiment (FIGS. 4 to 6), so the explanation thereof is used. 4 to 6 and the third embodiment shown in FIGS. 7 to 9 are denoted by the same reference numerals and means the same as each other.

In the anchor-reinforced earth wall structure of the third embodiment, as in the second embodiment, each anchor plate 32 is buried in the embankment 2 (upward inclined posture on the deep side), and each corresponding anchor plate 32 Since it has the same height as the wall surface materials (11A to 11D), the plan view area of the anchor plate 32 when buried in the ground (the area of left-right width W3×depth width D3 in FIG. 9) is further increased. As a result, the amount of embankment 2 applied as vertical earth pressure to anchor plate 32 is further increased.

In addition, when the plan view area of the anchor plate 32 (the area of the left-right width W3×the depth width D3 in FIG. 9) is increased, the amount of the embankment 2 applied to the anchor plate 32 as vertical soil pressure is further increased. The action of tilting the upper side of the plate 32 further to the depth side acts more strongly, which further tightens (pulls to the depth side) the connecting member 31 (especially the belt-like rope 31b on the upper side). Since this is a force against the wall surface materials (11A to 11D) against the forward pushing force (equivalent to the pull-out force F against the anchor) due to the earth pressure of the embankment 2, the larger the plan view area of the anchor plate 32, the more The stable attitude holding function for each of the wall surface materials 11A to 11D is increased.

[Fourth embodiment in FIGS. 10 to 13]
The fourth embodiment of FIGS. 10-13 shows a modification of the anchor plate 32 in the anchor-reinforced earth wall structure of the second embodiment (FIGS. 4-6).

In the anchor reinforced earth wall structure of the fourth embodiment, as shown in FIG. 10, the anchor plate 32 includes a planar mesh body 32A in which a wire net-like or grid-like mesh material 32d is incorporated in a frame 32c, It is composed of a sheet material 32B stretched on the front surface of the planar mesh body 32A.

The frame body 32c of the planar mesh body 32A is made of a hard material that is durable even when buried in the embankment 2 and is formed into a rectangular shape. As the material of the frame 32c, for example, a rust-proof metal pipe or a high-strength resin pipe can be used.

The mesh material 32d of the planar mesh body 32A is made of a material (for example, metal wire, high-strength resin, etc.) that is durable even when buried in the embankment 2, and is formed into a wire mesh or grid shape.

The sheet material 32B is made of a material (for example, a thick rigid resin sheet or cloth) that can prevent the passage of earth and sand and is durable when buried in the embankment 2, and has an area that covers the entire surface of the mesh material 32d. is doing.

As shown in FIG. 13, the anchor plate 32 used in the fourth embodiment is completed by stretching the sheet material 32B on the front surface of the planar mesh body 32A (the front surface of the mesh material 32d). It is.

In addition, the anchor plate 32 has the same height and width as the wall surface materials (11A to 11D) when buried in the embankment 2 (upward inclined posture on the far side).

As shown in FIG. 13, the anchor plate 32 used in this fourth embodiment has a sheet material 32B stretched over the entire front surface of a planar mesh body 32A (mesh material 32d portion). - As shown in Fig. 12, when buried in the embankment 2, it has rigidity such that it hardly deforms against earth pressure.

In addition, the anchor plate 32 has the same height and width as the wall surface materials (11A to 11D) when buried in the embankment 2 (upward inclined posture on the far side).

Since the construction method of the anchor-reinforced earth wall structure of the fourth embodiment (FIGS. 10 to 13) is substantially the same as that of the second embodiment (FIGS. 4 to 6), the explanation thereof is used. 4 to 6 and the fourth embodiment shown in FIGS. 10 to 13 have the same reference numerals as those of the second embodiment.

Also in the anchor-reinforced earth wall structure of the fourth embodiment, the plan view area of the anchor plate 32 in the ground-buried state (the area of left-right width W3×depth width D3 in FIG. The amount of embankment 2 applied as vertical earth pressure to is increased.

Furthermore, in the fourth embodiment, each anchor plate 32 is tilted upward on the back side, so that the action of tilting the upper part of the anchor plate 32 further to the back side works strongly. ), it becomes a force that resists the forward pushing force (corresponding to the pull-out force F against the anchor) due to the earth pressure of the embankment 2, and the function of maintaining a stable posture for each of the wall materials 11A to 11D increases.

Further, in the anchor plate 32 used in the fourth embodiment, since there are many spaces in the mesh material 32d of the planar mesh body 32A, which is the main body of the anchor plate 32, the weight is reduced compared to the precast one. is significantly lighter and can be easily handled during transportation and construction.

In addition, even though this anchor plate 32 is made lightweight by providing the mesh material 32d in its main body (planar mesh body 32A), the front surface of the planar mesh body 32A has a function of preventing the passage of earth and sand. Since the sheet material 32B is stretched, the anchor plate 32 has a sufficient pull-out resistance function.

In the fourth embodiment, the belt-shaped rope 31b is used as the connecting member 31 connecting the anchor plate 32 and the wall surface members (11A to 11D). A planar mesh body having the same structure as the planar mesh body 32A of the anchor plate 32 of the fourth embodiment may be used on both right and left sides of the anchor plate 32 in a vertical posture.

1 is a wall body, 2 is an embankment, 3A to 3D are anchors, 4 is a misalignment prevention structure, 11A to 11D are wall materials, 31 is a connecting member, 31a is a steel bar, 31b is a belt-shaped rope, 32 is an anchor plate, 32A is a planar mesh body, 32B is a sheet material, 32c is a frame body, 32d is a mesh material, 41 is an engaging portion, and 42 is an engagement receiving portion.

Claims (4)

A wall main body (1) is formed by arranging a plurality of wall surface materials (11A to 11D) vertically and horizontally, and a connecting member (31) is attached to the back side of each wall surface member (11A to 11D) and fixed to the connecting member (31). Anchor plates (32) and anchors (3A to 3D) are continuous , and by filling the back side of the wall body (1) with embankment (2) , each anchor (3A to 3D) is connected to the embankment ( 2) An anchor-reinforced earth wall structure embedded in the
Each anchor plate (32) consists of a sloping plate (32a) that is inclined upward toward the back side of the reinforcing earth wall, and the lower end of the slanting plate (32a) is oriented horizontally toward the back side of the reinforcing earth wall . An anchor-reinforced earth wall structure characterized by integrally forming a support plate (32b) extending through the wall. Each anchor plate (32) made up of a slanted plate (32a) has the same height as the wall surface material (11A to 11D) in a posture inclined upward toward the inner side of the reinforced earth wall. An engaging portion (41) and an engaging receiving portion (42) that engage in the longitudinal direction are provided at the abutting portion between the stacked lower anchor plate (32) and the upper anchor plate (32). The anchor-reinforced earth wall structure according to claim 1, characterized in that: A wall main body (1) is formed by arranging a plurality of wall surface materials (11A to 11D) vertically and horizontally, and a connecting member (31) is attached to the back side of each wall surface member (11A to 11D) and fixed to the connecting member (31). Anchor plates (32) and anchors (3A to 3D) are continuous , and by filling the back side of the wall body (1) with embankment (2) , each anchor (3A to 3D) is connected to the embankment ( 2) An anchor-reinforced earth wall structure embedded in the
Each anchor plate (32) is installed in a posture inclined upward toward the back side of the reinforced earth wall. 11D) are stacked vertically and installed in a continuous wall shape, and the bottom anchor plate (32) stacked vertically and the upper anchor plate (32) collide with each other . Anchor reinforcing earth wall structure characterized in that a misalignment prevention structure (4) consisting of an engaging portion (41) and an engaging receiving portion (42) that engage with each other in the front-rear direction is provided in the part. . A wall main body (1) is formed by arranging a plurality of wall surface materials (11A to 11D) vertically and horizontally, and a connecting member (31) is attached to the back side of each wall surface member (11A to 11D) and fixed to the connecting member (31). Anchor plates (32) and anchors (3A to 3D) are continuous , and by filling the back side of the wall body (1) with embankment (2) , each anchor (3A to 3D) is connected to the embankment ( 2) An anchor-reinforced earth wall structure embedded in the
Each anchor plate (32) is installed in a posture inclined upward toward the back side of the reinforced earth wall. 11D ) and stacked vertically to form a continuous wall. An anchor-reinforced earth wall structure characterized by adopting a sheet material (32B) having a function of blocking the passage of earth and sand stretched on the front surface of an intricate planar mesh body (32A).

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