JPH0346614B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable not only to the greening of slopes such as roads and residential areas, and the greening of collapsed slopes in disaster prevention works such as forests, but also to the greening of talus areas and exposed weathered bedrock. This is a method for constructing a vegetation foundation that is applied to greening areas where it is difficult for plants to grow and where the topography is unstable.
This article relates to a method for constructing a vegetated foundation in which the embankment layer and reinforcing material are integrated to prevent stress concentration.

[Prior Art] The following methods are known as methods for constructing this type of vegetation foundation.

(A) A method in which a band-shaped reinforcing material is connected to the back side of a concrete plate wall surface, and embankment is applied on top of this reinforcing material to form an embankment layer, and multiple reinforced soil unit layers are stacked in a stepped manner. .

(B) The reinforced soil structure shown in Figure 3 is used as a unit layer,
A method of laminating multiple layers of these unit layers in a stepwise manner in the same manner as described above.

In the unit layer shown in FIG. 3, a plurality of steel plate band-shaped wall members 1 having a U-shaped cross section are stacked horizontally and upright on the ground 2 to form a wall surface 3, and a reinforcing material 4 is attached to the back surface of the wall surface 3. The reinforcing material 4 is connected with the reinforcing material 4, and the reinforcing material 4 is further covered with earth, which is then rolled and compacted to form the earth embankment layer 5.

(C) The reinforced soil structure shown in Figure 4 is used as a unit layer,
A method of laminating multiple layers of these unit layers in a stepwise manner in the same manner as described above.

In the unit layer shown in Fig. 4, a plurality of supports 6, 6...6 are established on the ground 2 at predetermined intervals, and curved metal plates 1, 1...1 ( A wall surface 3 is constructed by fitting a wall surface member) into the wall surface 3, and a reinforcing material 4 is connected to the back surface of the wall surface 3 as shown in FIG. 3, and an embankment layer 5 is formed by embanking.

[Problem that the invention seeks to solve]

However, these methods (A), (B) and (C) have the following drawbacks. In other words, (A) Since the strip reinforcement resists pull-out due to the earth pressure applied to the plate-shaped wall due to friction with the earth and sand, earth and sand with a large frictional force, such as sand, are required as the embankment material. Because soil and sand with low frictional force, such as planted soil, have little pull-out resistance, it is necessary to excavate the ground in the field to ensure a long anchorage length, which makes construction extremely difficult on steep slopes, etc. The plate wall surface is heavy,
Construction is especially difficult on steep slopes. Furthermore, this method does not allow the area of vegetation to be expanded, especially on steep slopes.

(B) The unit layer shown in Figure 3 is superior in that it compresses vertically and adapts to the compression of the embankment layer 5, but during construction, the wall surface 3 cannot stand on its own, and therefore the work is difficult. It has poor properties and is easily displaced when the embankment layer 5 is rolled, and as a result, it is inevitable that the entire unit phase layer obtained will be greatly deformed. Furthermore, since this wall member 1 is simply made of a flat steel plate processed into a U-shaped cross section, it has no flexibility in the horizontal direction, and is therefore susceptible to earth pressure in the direction of the arrow as shown in Figure 5. Therefore, the connecting portion 7 of the wall member 1 is easily destroyed, and stress concentration is also likely to occur at the attachment portion of the reinforcing member 4.

(C) Furthermore, in the unit layer of Fig. 4, metal plates 1, 1...
1 has no margin for displacement in the vertical direction, and as the embankment layer 5 is compressed, the connecting portion 7 of the metal plate 1 is likely to be destroyed as shown in FIG. Furthermore, since the wall surface 3 is constructed by combining the metal plate 1 and the pillars 6, these metal plates 1 and the pillars 6
exhibits different behavior in response to loads, which tends to cause local stress concentration, making it impossible to maintain the integrity of the wall surface 3 and making it easy to break.

The object of the present invention is to provide excellent workability and less deformation, and furthermore, the wall surface, the embankment layer, and the reinforcing material are integrated so that stress concentration is less likely to occur, and the present invention is particularly suitable for greening steep slopes. The purpose of this invention is to provide a method for constructing a vegetation foundation that improves the method.

[Means for solving problems]

In order to achieve the aforementioned object, according to the present invention:
Multiple reinforced soil unit layers are stacked in a stepped manner, each consisting of a wall surface, an embankment layer placed on the back side of the wall surface, and a reinforcing material installed within this embankment layer and connected to the wall surface at one end. In the method for constructing a vegetation foundation, the wall surface is formed by forming a plurality of corrugated sections formed by curving a corrugated metal sheet in a direction perpendicular to the corrugated grooves, and overlapping the corrugated end surfaces adjacent to each other. It is characterized by being arranged so that the joint part is buried in the embankment layer.

Hereinafter, the present invention will be explained in detail using the accompanying drawings.

FIG. 1 is a perspective view of a concrete example of a vegetation foundation constructed by the method of the present invention, and FIG. 2 is a plan view (a model diagram) of the same, and 10 is a wall surface. This wall surface 10 is constructed using corrugated sections 11. Here, the corrugated section 11 is a member of the wall surface 10 formed by curving a corrugated metal sheet (indicated by number 12) in a direction perpendicular to the grooves 13 of the corrugation 12 as shown in the first figure. In this case, a plurality of corrugated sections 11 configured in this manner are connected to adjacent corrugated end surfaces 1.
1a and 11a, for example, bolt 14.
The wall surface 10 is constructed by connecting and joining the parts. This wall surface 10 further has a seam portion 15 that is formed by an embankment layer 5.
It is placed on the ground 2 so that the groove 13 with the corrugations 12 is horizontal to the surface of the ground 2.

Reinforcing materials 4, 4, . It is connected by folding back one end 4a and hanging it, and then pouring earth and sand onto the back side of the wall surface 10, that is, onto the reinforcing materials 4, 4...4, and rolling it to form an embankment.This process is repeated to add reinforcing material inside. 4, 4...4 embankment layers 5 are formed to form a reinforced soil unit layer A according to the present invention as shown in FIG. On this unit layer A, a unit layer B is further formed in a step-like manner in the same manner as described above, and further, on this unit layer B, a unit layer C is formed in a step-like manner, thereby constructing the vegetation foundation shown in the first diagram. . The number of unit layers is any desired number.

In addition, in each of the above-mentioned unit layers A, B, and C, the joint portion 15 of the wall surface 10 of the lower part (in this case, unit layer A) of the unit layers (for example, unit layers A, B) adjacent to each other is clearly shown in FIG. By stacking the corrugated sections 11 in a stepwise manner so as to be located at the central portion X of each corrugated section 11 on the upper wall surface 10 (unit layer B in this case), the vegetation area can be increased. 16 is a vegetated plant.

Note that the reinforcing material 4 may be in any shape such as a rod, a belt, a sheet, or a net, and in order to prevent the reinforcing material 4 from coming off from the embankment layer 5, a fixing plate 17 is provided at the tip of the reinforcing material to reinforce it. It is also possible to attach an arbitrary fixing member to the reinforcing material 4, such as fixing it perpendicularly to the material 4.

[Effect]

In the construction method of the present invention described above, since the curved corrugated section 11 is used as a member of the wall surface 10, the earth pressure (arrow view a) is reduced as shown in FIG.
The stress generated on the wall surface 10 due to the tensile force (arrow view b)
For this reason, Colgate section 11
By making the metal material thinner, the weight of the wall surface 10 can be reduced, and workability is improved.

Furthermore, since the corrugated section 11 is used as a unit of the wall surface 10, a vertical load in the direction of the arrow is applied to the wall surface 10 at one end 4a of the reinforcing material 4, as shown in FIG.
Since the corrugated 12 structure of the corrugated section 11 acts as a spring, the connecting portion 18 will not break even if the corrugated section 11 is displaced downward. Moreover, the earth and sand around the connecting part 18 can be removed by the groove 1 due to the corrugated 12 structure of the corrugated section 11.
Corrugated section 11 due to mud and sand getting stuck in 3.
Corrugated section 1
1 and the embankment layer 5, and stress concentration is less likely to occur at the connecting portion 18, which would normally be the weakest point.

Furthermore, the wall surface 10 has a corrugated section 11
Since the walls are corrugated and the section horizontal to the ground has an arch-like continuous shape, the wall surface 10 itself is self-supporting and has excellent workability.

In addition, the end face 11a of the corrugated section 11
Since the joint part 15 is buried in the embankment layer 5, this joint part 15 is integrated with the embankment layer 5 and acts as a support, and therefore a support like the conventional structure shown in FIG. 4 is not required. The entire wall surface 10 is integrated with the embankment layer 5, and stress concentration does not occur.

Furthermore, since the wall surface 10 is placed on the ground 2 so that the grooves 13 of the corrugations 12 are parallel to the surface of the ground 2, the cross section of the wall surface 10 in the horizontal direction with the ground 2 has an arch-shaped continuous shape, Therefore, it is only necessary to consider the tensile force on the wall 10 in response to the earth pressure from the back side, and the strong tensile force of the metal wall can be effectively utilized to reduce large earth pressure with an extremely thin wall cross section. can withstand.

Furthermore, since the wall surface 10 has a corrugated structure, there is room for displacement in the vertical direction with respect to the back earth pressure.
Therefore, there is no fear of breakage as shown in FIG. 5 even at the joint between the upper and lower corrugated sections.

Furthermore, if a resistor such as the fixing plate 17 is fixed to the tip of the reinforcing material 4, it is possible to obtain a large pull-out resistance and reduce the anchoring length even if earth and sand such as vegetation that cannot be expected to have a frictional force are used. Therefore, even on unstable slopes, stable earth retention is possible without excavating the local ground or with a small amount of excavation.

Furthermore, as shown in FIG. 2, the vegetation range can be widened by stacking single locations in a stepwise manner.

〔effect〕

As described above, the construction method of the present invention has excellent workability, is less prone to deformation, and has the effect that the wall surface, the embankment layer, and the reinforcing material are integrated, making it less likely to cause stress concentration and less likely to be destroyed.
This method is particularly suitable for greening steep slopes.

[Brief explanation of drawings]

FIG. 1 shows a perspective view of a concrete example of a vegetation foundation constructed according to the present invention, FIG. 2 shows a plan view thereof, and FIGS. 3 and 4 are explanatory diagrams of a conventional vegetation foundation. , FIG. 5 is an explanatory diagram showing the drawbacks of the prior art, FIGS. 6 and 7 are diagrams for explaining the effects of the present invention, and FIG. 8 is an illustration of the reinforcement according to the present invention. An explanatory diagram of a specific example of a method for connecting materials is shown. 2... Ground, 4... Reinforcement material, 5... Embankment layer, 1
0...Wall surface, 11...Corrugated section, 1
1a...end face, 12...corrugation, 13...groove, 1
5... Seam part, 16... Plant, A, B, C...
...Unit layer.

Claims (1)

[Claims] 1. A reinforced soil unit layer consisting of a wall surface, an embankment layer placed on the back side of the wall surface, and a reinforcing material laid within the embankment layer and connected at one end to the wall surface. In the method for constructing a vegetation foundation in which multiple layers are laminated in a stepped manner, the wall surface includes a plurality of corrugated sections formed by curving a corrugated metal sheet in a direction perpendicular to the corrugated grooves, with adjacent corrugated sections. A method for constructing a vegetation foundation, characterized in that the end faces of the vegetated foundations are overlapped and joined together, and the joints are arranged so as to be buried within the embankment layer. 2. In the construction method according to claim 1, in each of the reinforced soil unit layers, each joint portion of the lower wall surface of adjacent unit layers is located at the center portion of each corrugated section of the upper wall surface. The construction method consists of stacking layers in a stair-like manner.