JPH1060896A - Wall surface structure of reinforced earth structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent stress concentration in a connection part between a wall surface panel set up at the tip of an embarkment layer and an embarkment reinforcing material which holds this wall surface panel and protect the connecting part from shear failure attributable to stress concentration. SOLUTION: A plurality of connectors 5 are projectingly provided vertically in U-shape in the rear surface of a wall surface panel 2 set up at the tip of an embankment layer built-up to a specified height while it is being rolled up. An embankment reinforcing material 3, which holds the wall surface panel is formed by projectingly providing a connecting rod 3b at the tip of a band- shaped reinforcing plate horizontally. Furthermore, both ends of this connecting rod 3b are hooked on the connector 5 respectively and connected to the wall surface 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stress concentration at a joint between a wall panel installed at the tip of an embankment layer and a band-shaped embankment reinforcing material holding the wall panel, and shearing of the joint due to the stress concentration. The present invention relates to a wall structure of a reinforced soil structure that prevents breakage.

[0002]

2. Description of the Related Art
As a reinforcing earth structure such as a retaining wall, for example, as shown in FIG. 11, a plurality of fixtures 21 are protrudingly provided on a back portion at a tip end of an embankment layer 20 piled at a predetermined height and precast. A plurality of wall panels 22 formed of a concrete plate are continuously arranged in the vertical and horizontal directions, and a plurality of embankment reinforcing members 23 made of geotextile, reinforced grit, band-shaped steel material, or the like are provided in the embankment layer 20. In addition, a construction is known in which the embankment reinforcing material 23 is connected to the back surface of the wall panel 22 via a fixing metal 21 while being buried.

However, when a geotextile is used as the embankment reinforcing material 23, the geotextile is soft and easily displaced following the displacement of the embankment.
There is a risk that the wall panel 22 may easily tilt or move. For this reason, the geotextile as the embankment reinforcing material 23 is not suitable as an embankment reinforcing material also serving as a fixing member of the wall panel 22, and the tip of the geotextile is mainly involved at the tip of the embankment layer 20 to green the surface of the embankment layer 20. Used to be.

On the other hand, in the case of using reinforcing steel grit as the embankment reinforcing material 23, the embankment has a large restraining effect, and both the strength and the bending rigidity are large, so that it is difficult to cause elongation or displacement. Although it is excellent as an embankment reinforcing material, it has problems such as an increase in the amount of reinforcing bars and uneconomical effects.

Further, when a band-shaped steel material is used as the embankment reinforcing material 23, the band-shaped steel material has an advantage that the amount of steel material can be reduced because the reinforcing principle is that the steel material is integrated with the soil by frictional force with the soil. However, since the rigidity is large as it is, there is a drawback that it is difficult to follow the displacement of the embankment and is likely to be subjected to stress concentration. For this reason, in particular, the vicinity of the connection portion with the wall panel 22 may be broken by the shearing force before the original tensile strength is maximized. Therefore, when installing the strip-shaped steel material as the embankment reinforcing member 23, it is necessary to install the belt-shaped steel material so as to receive as little shearing force as possible and receive only tensile force.

According to the present invention, particularly, a band-shaped steel material is used for embankment reinforcing material 23.
The present invention relates to the improvement of a reinforced soil structure used as a material.

The wall panel 22 is usually formed of a rigid material such as concrete, while the embankment layer 20 is a granular material and is easily compressed and deformed during rolling.
The connection between the embankment reinforcing material 23 and the embankment reinforcing material 23 is relatively displaced when the embankment layer 20 is rolled, and is greatly affected by the movement of the surrounding soil particles, and may eventually be destroyed.

It is extremely economical and desirable to use a locally generated material as the embankment for constructing the embankment layer 20, but if the embankment quality is poor, the wall surface is likely to be displaced due to the large compressibility of the soil. In addition, wall panels over time
There is a problem that the stress at the connection between the reinforcing material 22 and the embankment reinforcing material 23 changes, a complicated stress that is difficult to predict is easily generated at the connection, and the connection is easily broken.

Generally, the displacement of the wall surface is expanded by compressing the embankment layer 20 due to the rolling load and expanding in the lateral direction, and furthermore, the loosening at the connecting portion between the wall surface panel 22 and the embankment reinforcing material 23 at the time of rolling is increased. In addition, deformation of the connecting portion caused by the load, deformation of the embankment reinforcing member 23 and the wall panel 22 connected to the embankment reinforcing member 23 due to the compression of the embankment layer 20 due to the overload after rolling, or stress concentration at the connecting portion. Happens by.

In order to solve such a problem, an invention relating to a reinforced earth structure filed by the present applicant (Japanese Patent Publication No.
No. 59-20821) is known (see FIG. 12).

However, these are all embankment reinforcing materials 23.
Has a structure in which the embankment layer 20 descends along the rod-shaped body 24 projecting vertically from the wall panel 22. There is a possibility that a large shear force is generated at the connecting portion 23a, and the embankment reinforcing material 23 is sheared and broken at the connecting portion 23a.

That is, when a shearing load is applied along the cross section to the connecting portion 23a of the embankment reinforcing member 23 installed in the embankment layer 20, the shearing force is applied before the tensile force held by the embankment reinforcing member 23 sufficiently acts. It is easily broken. Therefore, it is desirable to use a reinforcing earth structure and a wall structure in which such a shearing force does not act on the embankment reinforcing member 23 and only a tensile force acts in the longitudinal direction of the embankment reinforcing member 23.

In this type of reinforcing soil structure, the function required of the embankment reinforcing material 23 is that the embankment layer 20 having no tensile force.
To provide the tensile strength of the embankment reinforcing material 23 to the
Originally, the embankment reinforcing material 23 desirably has flexibility so that it can be integrated with the compressible embankment. Therefore, the smaller the member cross section is, the more preferable the tensile strength is. In addition, it is needless to say that a large pulling resistance is desirable.

For these reasons, it is difficult to use a highly compressible cohesive soil, such as Kanto loam, which is often present as locally generated material in Japan as an embankment material.

According to the present invention, the connecting portion between the strip-shaped embankment reinforcing material and the wall panel not only slides down but also slides down due to the compression settling of the embankment layer so that locally generated material having high compressibility can be used as the embankment material. When the embankment reinforcing material subsides to the maximum extent possible, any further compression subsidence of the embankment layer causes the connection between the embankment reinforcing material and the wall panel to rotate downward, causing shearing at the embankment reinforcing material connection. The structure is such that the force does not easily act and can withstand only the tensile force of the embankment reinforcement material.If the embankment reinforcement material sinks following the compression settlement of the embankment layer and the settlement reaches the limit, embankment reinforcement Provided is a wall structure of a reinforced soil structure in which a material is rotated downward at a connection portion with a wall panel and only a pulling force is applied so that a shear force is not applied to the connection portion as much as possible. For the purpose of Rukoto.

[0016]

A wall structure of a reinforced soil structure according to the present invention comprises an embankment layer constructed at a predetermined height while being rolled, and an embankment layer provided at the tip of the embankment layer. The present invention relates to a wall structure of a reinforced earth structure, comprising: a wall panel to be held; and a plurality of strip-shaped embankment reinforcing members buried in a plurality of layers in the embankment layer and holding the embankment layer and fixing the wall panel. A U-shaped connecting bracket is vertically projected in parallel on the back of the wall panel, and the embankment reinforcing material is formed by horizontally projecting a connecting rod at an end of a band-shaped reinforcing plate, In addition, both ends of the connecting rod are respectively hooked on the connecting fittings and connected to the wall panel.

Further, the reinforcing plate of the embankment reinforcing material is formed of a steel plate or a synthetic resin plate. Further, a plurality of supporting plates are attached to the end of the reinforcing plate, or the end of the reinforcing plate and arbitrary several places, and the pull-out resistance is determined. Power has been increased.

[0018] Further, a stopper is provided at both ends of the connecting rod so as to be hooked on the connecting fitting so that both ends of the connecting rod do not come off from the connecting rod.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 of the Invention FIGS. 1 to 3 show an embodiment of the present invention. In the drawings, reference numeral 1 denotes an embankment layer which is laid up to a predetermined height while carefully rolling, and 2 is connected to a tip portion of the embankment layer 1 mutually. A wall panel that is stacked in a plurality of stages to form a wall surface and holds the embankment layer 1 so as not to collapse, and reference numeral 3 is embedded in a plurality of layers in the embankment layer 1 and moves and sinks the embankment layer 1 An embankment reinforcing material that holds the wall panels 2 at the front end of the embankment layer 1 while holding them so as not to flow out.

The wall panel 2 is formed from a precast concrete plate into a horizontally long rectangular plate shape, and has a dowel 4a made of a reinforcing bar or the like and a dowel hole 4b of a predetermined depth formed at the center of the upper end surface and the lower end surface. . The dowels 4a and the dowel holes 4b are respectively engaged with the dowel holes 4b and the dowels 4a of the wall panel 2 located on the upper side and the lower side, respectively, so that the wall panels 2 do not shift sideways (FIG. 3B). reference).

A set of connecting metal fittings 5 for connecting the embankment reinforcing material 3 is protrudingly provided substantially at the center of the back surface of the wall panel 2. The connection fitting 5 is formed from a reinforcing bar, etc.
A vertical U-shape protrudes from the back of the device.

The embankment reinforcing material 3 is a reinforcing plate 3a buried horizontally in the embankment layer 1, and a connecting rod 3b protruding from an end of the reinforcing plate 3a on the side of the wall panel and being hooked on the connecting fitting 5. And a supporting plate 3c protruding from the opposite end of the reinforcing plate 3a to prevent the reinforcing plate 3a from being pulled out. The reinforcing plate 3a is formed from a steel plate, a synthetic resin plate, or the like. The connecting rod 3b is attached by winding the end of the reinforcing plate 3a, or by welding when the reinforcing plate 3a is made of metal such as a steel plate, and the supporting plate 3c is also attached to the opposite end of the reinforcing plate 3a. It is attached to the same way.

The embankment reinforcing material 3 formed in this way is extremely fastened to the rear surface of the wall panel 2 via the connecting metal fittings 5 by hooking both ends 3d, 3d of the connecting rod 3b to the connecting metal fittings 5,5. They are easily connected (see FIG. 3 (a)). in this case,
By rotating the embankment reinforcing material 3 about its material axis from the upright state to the horizontal state, the right and left ends 3 of the connecting rod 3b are formed.
d, 3d can be easily hooked to the left and right connecting fittings 5, 5, and the right and left ends 3d, 3d of the connecting rod 3b can be connected by setting the embankment reinforcing material 3 from a horizontal state. Metal fittings
Can be easily removed from 5,5.

FIGS. 4 (a) and 4 (b) show another example of the embankment reinforcing material 3, and nuts (FIG. 4 (a)) or hooks which are hooked to the connecting fittings 5 at both ends 3d of the connecting rod 3b. (See Fig. 4 (b).) With the retaining material 3e, which is composed of the embankment reinforcing material 3, the embankment reinforcing material 3 is used. Even if it does, the both ends 3d of the connecting rod 3b do not come off from the left and right connecting fittings 5, and the embankment reinforcing material 3 can be reliably connected to the wall panel 2.

FIGS. 5 and 6 show another example of the wall panel 2. A pair of connecting fittings 5 are provided at both ends of the wall panel 2 so as to project vertically and in a U-shape, respectively. The embankment reinforcing members 3 are held at both ends by two embankment reinforcing members 3 via a pair of connecting metal fittings 5.

In such a configuration, even if the embankment reinforcing material 3 sinks due to the settlement caused by the compression during the compaction of the embankment layer 1 or the sedimentation over time after construction, the end of the embankment reinforcing material 3 is connected to the connecting rod 3b. Slides down along the connection fitting 5,
Moreover, since the connecting rod 3b can freely rotate in the vertical direction with respect to the connecting fitting 5, stress due to the settlement of the embankment layer 1 does not concentrate on the connecting portion between the wall panel 2 and the embankment reinforcing material 3, and Since only the tensile force acts on the embankment reinforcing material 3, there is no possibility that the connection portion is damaged or the wall panel 2 is deformed, and the wall panel 2 can be securely held.

In the construction, the soil is clogged under the connecting rod 3b of the embankment reinforcing material 3 by the compaction of the embankment layer 1,
In order to prevent the connecting rod 3b from being unable to descend to the lower end of the connecting fitting 5, a filling 6 made of a foam material or the like may be interposed below the connecting rod 3b (see FIG. 3 (c)). .

7 to 9 show another embodiment of the present invention. FIG. 6 shows a taper 2a at the upper and lower edges of each wall panel 2. FIG.
8 (a) and 8 (b) show that the rear surface of the wall panel 2 has
The connecting metal fittings 5 are protruded in two steps, and the embankment reinforcing material 3 is installed in two steps with respect to one wall panel 2 via the connecting metal fittings 5 to hold the wall panel 2. Further, FIG. 9 shows the embodiment shown in FIGS. 8 (a) and 8 (b) in which the design is enhanced by adding a taper 2a (chamfer) to the upper and lower edges of each wall panel 2. FIG.

Next, the construction method will be briefly described.
(1) First, the embankment of the embankment layer 1 is carefully rolled up to the mounting position of the connection fitting 5A on the lower end side to form the embankment layer 1a.

(2) Next, an embankment reinforcing material is placed on the embankment layer 1a.
3A is installed, and a wall panel is installed at the tip of the embankment layer 1a.
2A is built, and the end of embankment reinforcing material 3A is connected with 5A
To the back of the wall panel 2A.

(3) Next, the embankment is carefully rolled up to the mounting position of the connection fitting 5B on the upper end side to form the embankment layer 1b. In this case, even if the embankment layer 1a sinks due to the compaction and the embankment reinforcing material 3A sinks, the connecting rod 3a simultaneously descends along the connecting metal fitting 5A, so that the wall panel 2A and the embankment reinforcing material 3A There is an effect that stress is not concentrated on the connecting portion, and damage to the connecting portion and deformation of the wall panel 2 can be prevented.

(4) Next, an embankment reinforcing material is placed on the embankment layer 1b.
3B is newly installed, and the end of embankment reinforcing material 3B is connected
Connect to wall panel 2A via 5B.

Similarly, the wall panel 2B and the embankment layer 1
c, Construct embankment reinforcement 3C, and then alternately construct wall panels, embankment layers, and embankment reinforcement to build the entire structure.

[0034]

The present invention has the above-described structure,
In particular, a U-shaped connecting bracket is vertically protruded in parallel on the back of the wall panel installed at the tip of the embankment layer, and an embankment reinforcing material for holding the wall panel is provided at the end of the band-shaped reinforcing plate. The connecting rod is formed by protruding horizontally at the part, and both ends of the connecting rod are respectively hooked to the connecting fittings and connected to the wall panel, so that the embankment of the embankment layer at the time of construction, Even if the embankment reinforcement material sinks along with the settlement of the embankment layer with the passage of many years, the wall panel side end of the embankment reinforcement material descends along the connecting bracket, and it can be rotated downward with the connecting rod as an axis, There is no stress concentration due to the settlement of the embankment layer at the connection between the wall panel and the embankment reinforcement, so the wall surface is deformed and the wall panel and the connection between the wall panel and the embankment reinforcement are damaged There is an effect that can solve such problems as.

Further, since the embankment reinforcing member is connected to the wall panel simply by hanging the left and right ends of the connecting rod on the connecting metal, the embankment reinforcing member can be connected to the wall panel very easily. Since the position of the wall panel and the embankment reinforcing material can be freely adjusted, there is an effect that the construction is easy.

Further, since the stoppers are provided at both ends of the connecting rod so as to be hooked on the connecting metal fittings, the rolling pressure of the embankment can be reduced.
Even if the embankment reinforcing material is pressed and tilted during construction, both ends of the connecting rod do not come off from the left and right connecting metal fittings, and the embankment reinforcing material can be reliably connected to the wall panel.

Further, since the reinforcing plate of the embankment reinforcing material is formed of a steel plate or a synthetic resin plate, the embankment layer can be held in a very stable state, and one or more of the embankment layers can be provided at the end of the reinforcing plate or at any desired position. Since a plurality of supporting plates are provided in a protruding manner, the pull-out resistance is significantly increased, and there is an effect that the embankment layer and the wall panel can be securely held.

[Brief description of the drawings]

1A is a partial front view showing an example of a wall structure of a reinforced soil structure, and FIG. 1B is a longitudinal sectional view of FIG.

2A is a plan view showing a wall panel and an embankment reinforcing material, and FIG. 2B is a perspective view thereof.

3 (a) is a partial rear view of a wall panel showing how to attach an embankment reinforcing material, FIG. 3 (b) is a partial longitudinal sectional view showing a connecting portion between upper and lower wall panels, and FIG. 3 (c) is a wall panel and an embankment FIG. 4 is a partial vertical cross-sectional view showing a connection portion with a reinforcing member.

FIGS. 4A and 4B are plan views showing another example of the embankment reinforcing material.

FIG. 5 is a plan view showing a wall panel and an embankment reinforcing material.

FIG. 6 is a perspective view showing a wall panel and an embankment reinforcing material.

FIG. 7 is a longitudinal section showing an example of the wall structure of the reinforced soil structure.

8A is a partial front view showing an example of a wall structure of a reinforced soil structure, and FIG. 8B is a longitudinal sectional view of FIG.

FIG. 9 is a longitudinal section showing an example of the wall structure of the reinforced soil structure.

FIG. 10 is a longitudinal section showing a method of constructing a wall structure of a reinforced soil structure.

FIG. 11 is a perspective view showing a structure of a connecting portion between a conventional wall panel and an embankment reinforcing material.

FIG. 12 is a perspective view showing a structure of a connecting portion between a conventional wall panel and an embankment reinforcing material.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... embankment layer, 2 ... wall panel, 3 ... embankment reinforcing material, 3a ... reinforcing plate, 3b ... connecting rod, 3c ... bearing plate, 3d ... both ends of connecting rod, 3e ... stopper, 4a ... dowel, 4b ... dowel holes, 5 ... connecting brackets.

Continued on the front page (72) Inventor Naoaki Suemasa 573-74, Kishine-cho, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Nobuhiro Suzuki 954-1 Asayama Imazu, Ichihara-shi, Chiba Prefecture

Claims (4)

[Claims] 1. An embankment layer constructed at a predetermined height while being compacted, a wall panel installed at the tip of the embankment layer and holding the embankment layer, and embedded in the embankment layer in a plurality of layers,
In a wall structure of a reinforced soil structure comprising a plurality of strip-shaped embankment reinforcing members holding the embankment layer and fixing the wall panel, a U-shaped connecting metal fitting is provided on a back portion of the wall panel. Vertically projecting in parallel, the embankment reinforcing material is formed by horizontally projecting a connecting rod at the end of a belt-shaped reinforcing plate, and both ends of the connecting rod are hooked on the connecting metal fittings. A wall structure of a reinforced soil structure, wherein the wall structure is connected to the wall panel. 2. The wall structure of a reinforced soil structure according to claim 1, wherein a stopper is provided at both ends of the connecting rod so as to be hooked on the connecting fitting. 3. The wall structure of a reinforced earth structure according to claim 1, wherein the reinforcing plate is made of a steel plate or a synthetic resin plate. 4. The support plate according to claim 1, wherein one or a plurality of supporting plates are attached to an end of the reinforcing plate or an arbitrary position between the end and the middle. The wall structure of the reinforced soil structure according to the item.