JP6726702B2 - Light embankment structure on the back of the structure - Google Patents

Description

The present invention relates to a lightweight embankment structure on the back of a structure, which is formed by forming a lightweight embankment containing a foamed resin material on the back of the structure.

For example, on the back of structures such as abutments and concrete retaining walls, in order to reduce back soil pressure and suppress settlement, a lightweight and self-supporting lightweight embankment containing foamed resin material is formed using EPS method. There is. However, in Non-Patent Document 1 (especially page 165, lines 7 to 11), from the dynamic analysis and the centrifugal model experiment, the light embankment and the earth pressure on the back surface of the light embankment via the concrete floor slab constituting the light embankment structure. It is stated that there is a report that is acting on the structure (locally excessive load is applied). Therefore, according to the description of Non-Patent Document 1, in consideration of the action of the back soil pressure and the behavior of the lightweight embankment at the time of the earthquake, it is possible to suppress the damage of the structure at the time of the earthquake. It turns out that it is necessary to design the back structure.

By the way, as a conventional lightweight embankment structure, for example, in Patent Document 1 (particularly claim 6, abstract, FIG. 6), an edge is cut between an outer retaining wall integrated with a retaining wall and a concrete floor slab. Therefore, the structure in which the joint material having elasticity is sandwiched is described. In addition, in the lightweight embankment structure described in Patent Document 1, a concrete floor slab is vertically movably attached to the H-shaped steel forming the outer earth retaining wall.

In addition, for example, in Patent Document 2 (particularly claim 4, paragraph [0024], FIG. 1), a compressive deformation is caused between the upper concrete floor slab and the raised portion for raising the height of the retaining wall than the foam plate. A light embankment with a retaining wall with easy spacers is described.

JP, 2003-129501, A JP, 2005-146618, A

"Latest EDO-EPS Method" Styrofoam Civil Engineering Method Development Organization, Publisher: Riko Book Co., Ltd., published December 17, 2016 p.164-170

In the conventional lightweight embankment structure as described in Patent Document 1, although the joint material having elasticity is sandwiched, the concrete floor slab may locally apply an excessive load to the back surface of the retaining wall during an earthquake. It does not have a mitigating configuration. Further, the conventional lightweight embankment described in Patent Document 2 also does not have a configuration for reducing the local excessive load applied to the back surface of the retaining wall by the concrete floor slab during an earthquake.

Therefore, a lightweight embankment structure with a structure that reduces the excessive load locally applied to the back surface of the structure by the concrete floor slab during an earthquake in consideration of the action of the back soil pressure and the behavior of the lightweight embankment during an earthquake. The inventors of the present application have considered that the development of

Specifically, the intermediate concrete floor slab that constitutes the lightweight embankment structure is subjected to the load (mass) of the foamed resin material, the concrete floor slab, and the road pavement laminated above the concrete floor slab. .. The intermediate concrete floor slab is pressed against the foamed resin material laminated below the concrete floor slab by the load. For this reason, a load due to friction between the foamed resin material and the concrete floor slab that occurs during an earthquake is applied to the intermediate floor slab. Then, an excessive load is locally concentrated on the structure through the intermediate concrete slab. Therefore, the development of a lightweight embankment structure that can withstand the load of foamed resin materials and concrete floor slabs in the vertical direction and that exhibits the buffering property to reduce the local load during an earthquake in the horizontal direction has been developed. The inventors of the present invention considered that it is necessary.

One aspect of the present invention is to provide a lightweight embankment structure on the back surface of a structure, which can reduce the load of a concrete floor slab that constitutes the lightweight embankment structure locally on the back surface of the structure during an earthquake. The main purpose is to provide.

In order to solve the above problems, a lightweight embankment structure on the back surface of a structure according to an aspect of the present invention is a lightweight embankment structure formed by forming a lightweight embankment containing a foamed resin material on the back surface of the structure, It is characterized in that a cushioning material having a horizontal length of 50 mm or more is arranged between at least the concrete floor slab of the embankment and the structure.

In the lightweight embankment structure on the back surface of the structure according to one aspect of the present invention, it is more preferable that the cushioning material has a vertical compressive strength equal to or higher than that of the foamed resin material. Further, in the lightweight embankment structure on the back surface of the structure according to one aspect of the present invention, the maximum compressive strength of the cushioning material within 10% of the horizontal strain is 70% or less of the vertical compressive strength. Is more preferable. Further, in the lightweight embankment structure on the back surface of the structure according to one aspect of the present invention, it is more preferable that the cushioning material is a foamed resin formed by an extrusion foaming method. Further, in the lightweight embankment structure on the back surface of the structure according to an aspect of the present invention, it is more preferable that the cushioning material has a larger area in contact with the back surface of the structure than in contact with the concrete floor slab. Further, in the lightweight embankment structure on the back surface of the structure according to one aspect of the present invention, it is more preferable that the concrete floor slab is composed of a plurality of blocks and a cushioning material is further arranged between the blocks.

According to one aspect of the present invention, since the cushioning material is arranged at least between the concrete floor slab and the structure of the lightweight embankment, at the time of an earthquake, the concrete floor slab that constitutes the lightweight embankment structure is a rear surface of the structure. It is possible to reduce locally applying an excessive load. Therefore, even after the earthquake, the structure and the lightweight embankment structure, and even the road surface formed on the upper part of the lightweight embankment structure, for example, can keep the road surface in a safe state (improve the earthquake resistance). It is possible to provide a lightweight embankment structure.

It is sectional drawing which shows schematic structure of the lightweight embankment structure of the structure back which concerns on one embodiment of this invention. (A) And (b) is sectional drawing which shows the structure of the principal part of a lightweight embankment structure. It is sectional drawing which shows schematic structure of the lightweight embankment structure of the back surface of the structure which concerns on other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to this, and various modifications can be made within the range described, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also applicable. , Within the technical scope of the present invention. In this specification, unless otherwise specified, “A to B” representing a numerical range means “A or more and B or less”.

The lightweight embankment structure on the back surface of the structure in one embodiment of the present invention is a lightweight embankment structure formed by forming a lightweight embankment containing a foamed resin material on the back surface of the structure, and at least a concrete floor slab of the lightweight embankment. A cushioning material having a horizontal length of 50 mm or more is arranged between the structure and the above structure.

[Embodiment 1]
Hereinafter, a lightweight embankment structure on the back surface of a structure in one embodiment of the present invention will be described with reference to FIGS. Note that the lightweight embankment structure shown in FIG. 1 exemplifies a case where the structure is an abutment.

[Lightweight embankment structure, structure]
As shown in FIG. 1, the lightweight embankment structure includes a lightweight embankment structure 2 formed on the back surface of the structure 1. The structure 1 is installed on a foundation ground (for example, cohesive soil) and is fixed by a plurality of foundation piles 11 that reach a supporting ground (for example, sandy soil). The structure 1 may be any structure as long as the back surface receives earth pressure, and examples thereof include an abutment, a concrete retaining wall, and a revetment, but are not particularly limited.

[Lightweight embankment structure]
As shown in FIG. 1, the lightweight embankment structure 2 is constructed by the EPS embankment method. In the EPS embankment method, the uppermost concrete floor slab 3 is provided on the top of the foamed resin material 4 made of foamed resin, and the foamed resin material 4 formed by stacking a plurality of layers is necessary between layers as described later. Accordingly, it is a method of constructing (manufacturing) the lightweight embankment structure 2 provided with the intermediate concrete slab 3.

The lightweight embankment structure 2 is a laminated structure that is formed between the back surface of the structure 1 and the embankment (for example, sandy soil) and that includes the concrete floor slab 3 and the foamed resin material 4. Sometimes called. The lightweight embankment structure 2 is constructed by, for example, a construction method defined in “EDO-EPS construction method design/construction standard document (draft)”. The lightweight embankment structure 2 is constructed on the foundation ground and/or the foundation of the structure 1, the step board 5 is installed on the uppermost part thereof, and pavement is applied on it.

Specifically, the lightweight embankment structure 2 is constructed (manufactured) by, for example, the following method. First, the foamed resin material 4 is installed on the foundation ground and/or the foundation of the structure 1, and the intermediate concrete floor slab 3 is formed every 3 m in height of the foamed resin material 4, and the structure 1 and the concrete floor are also formed. The cushioning material 7 is arranged between the plate 3 and the plate 3. Next, the uppermost concrete floor slab 3 is formed on the uppermost foamed resin material 4 installed on the intermediate concrete floor slab 3, and a cushioning material is provided between the structure 1 and the concrete floor slab 3. Place 7. The intermediate and uppermost concrete floor slabs 3 are formed by placing reinforcing bars in a grid pattern and then placing concrete. Further, the step board 5 is installed on the uppermost cushioning material 7 and a part of the uppermost concrete floor slab 3, and pavement is applied on it. Thereby, the lightweight embankment structure 2 is constructed.

Alternatively, the lightweight embankment structure 2 is constructed (manufactured) by, for example, the following method. First, the foamed resin material 4 is installed on the foundation ground and/or the foundation of the structure 1. Next, the cushioning material 7 is arranged every 3 m in height of the foamed resin material 4, and the intermediate concrete floor slab 3 is formed by using the cushioning material 7 as a mold. As a result, the cushioning material 7 is arranged between the structure 1 and the concrete floor slab 3. Next, the cushioning material 7 is arranged on the uppermost foamed resin material 4 installed on the intermediate concrete floor slab 3, and the cushioning material 7 is used as a mold to form the topmost concrete floor slab 3. The intermediate and uppermost concrete floor slabs 3 are formed by placing reinforcing bars in a grid pattern and then placing concrete. Further, the step board 5 is installed on the uppermost cushioning material 7 and a part of the uppermost concrete floor slab 3, and pavement is performed on it, if necessary. Thereby, the lightweight embankment structure 2 is constructed.

<Foam resin material>
The foamed resin material 4 is not particularly limited as long as it is formed of a material having lightness, strength and flexibility that can withstand the top load, traffic load, etc. of the lightweight embankment structure 2. For example, foamed polystyrene (EPS) is used. It is preferable to have. The foamed resin material 4 is preferably a laminated body formed by stacking a plurality of foamed resin blocks. Thereby, the foamed resin material 4 can be easily installed.

Since the foamed resin material 4 also has a function as a cushioning material, the foamed resin material 4 does not locally apply an excessive load to the back surface of the structure 1 during an earthquake.

By the way, instead of disposing the cushioning material 7 between the structure 1 and the concrete floor slab 3, even if the structure 1 and the lightweight embankment structure 2 horizontally move (displace) during an earthquake, It is also conceivable to provide a gap between the structure 1 and the lightweight embankment structure 2. However, when such a gap is provided, the lightweight embankment structure 2 is inferior in pressure resistance, which is not preferable.

<Concrete floor slab>
The concrete floor slab 3 is provided with the uppermost concrete floor slab on top of the foamed resin material 4 for the purpose of adjusting the unevenness, the load distribution, the fixing of the foamed resin block, and the buoyancy measure, and is laminated in a plurality of stages. An intermediate concrete floor slab (intermediate floor slab) is provided between the layers of the foamed resin material 4 as required. The intermediate concrete floor slab 3 provided between the layers of the foamed resin material 4 is installed every 3 m in height of the foamed resin material 4 based on the above-mentioned "EDO-EPS construction method design/construction standard document (draft)" and the like. .. When the height of the foamed resin material 4 is less than 3 m, the intermediate concrete floor slab may not be provided.

The thickness (vertical direction) of the concrete floor slab 3 is preferably 100 to 300 mm. Further, in order to improve the strength of the concrete floor slab 3, preferably, lattice-shaped reinforcing bars are embedded as a base material inside the concrete floor slab 3. The covering thickness of the reinforcing bar is preferably 20 mm or more from the viewpoint of preventing deterioration of the reinforcing bar due to oxidation.

<Cushioning material>
As shown in FIG. 1, a cushioning material 7 is arranged between the concrete floor slab 3 and the structure 1. The cushioning material 7 is arranged in order to prevent the entire lightweight embankment structure 2 including the concrete slab 3 from moving (displacement) in the horizontal direction due to an earthquake and coming into contact with the structure 1. The cushioning material 7 has a lightness, strength and flexibility capable of withstanding the top load and the traffic load of the lightweight embankment structure 2, and is a material that can be crushed in the horizontal direction during an earthquake to disperse and absorb the load. Is formed of.

It is more preferable that the cushioning material 7 has vertical compressive strength and elastic modulus that are equal to or higher than those of the foamed resin material 4. The maximum compressive strength of the cushioning material within the horizontal strain of 10% is more preferably 70% or less of the vertical compressive strength, further preferably 60% or less, and 50 % Or less is particularly preferable. Specifically, the vertical compressive strength of the buffer material 7, more preferably from 10 to 1000 kN / ^{m 2,} further preferably ^{20~500 kN / m 2, 30~200 kN} / It is particularly preferable that it is m ² . Horizontal strain of 10% within a maximum compressive strength of the cushioning material 7 is more preferably from 7 to 700 kN / ^{m 2,} further preferably 14~350 kN / ^{m 2,} 21~140 It is particularly preferably kN/m ² . On the other hand, the compressive strength of the foamed resin material 4 is usually 10 to 1000 kN/m ² . In the present specification, "compressive strength" and "maximum compressive strength within 10% of strain" are measured by a compression test described in JIS K7220.

Further, the horizontal compression modulus of the cushioning material 7 is preferably 350 to 35000 kN / ^{m 2,} more preferably 1000~7000 kN / ^{m 2.} On the other hand, the elastic modulus of the foamed resin material 4 is usually 500 to 50,000 kN/m ² .

The cushioning material 7 is preferably, for example, a foamed resin such as polystyrene, polyurethane, polyethylene, polypropylene or the like, or a foamed resin of a copolymer thereof, and from the viewpoint of strength and workability, a foamed resin of polystyrene is more preferable. .. Further, it is more preferable that the cushioning material 7 is a foamed resin formed by an extrusion foaming method. The foamed resin formed by the extrusion foaming method has a property that the compression strength in the thickness direction is strong, while the compression strength in the width direction and the extrusion direction orthogonal to the thickness direction is weaker than that. Therefore, by using the thickness direction as the vertical direction and the width direction or the extrusion direction as the horizontal direction for the lightweight embankment structure 2, the foamed resin can be suitably used as the cushioning material 7.

As a production method using an extrusion foaming method of a foamed resin, for example, a styrene resin composition obtained by adding an additive such as a flame retardant, a cell regulator, a lubricant, an inorganic compound to the styrene resin as necessary. , A melted styrene-based resin composition obtained by heating to a heating and melting means such as an extruder and heating at about 150 to 260° C. under a high-pressure condition at any stage, and then a fluid gel. Then, the mixture is cooled to a temperature suitable for extrusion foaming, and the fluidized gel is extruded and foamed into a low-pressure region through a die. The styrene resin is not particularly limited, and for example, a styrene homopolymer obtained by polymerizing only a styrene monomer; a styrene monomer and a monomer copolymerizable with styrene or a derivative thereof. Random, block or graft copolymers obtained by copolymerization; modified polystyrene such as post-brominated polystyrene and rubber-reinforced polystyrene; a mixture of these resins; and the like. From the viewpoint of workability, styrene homopolymer is more preferable as the styrene resin.

Examples of the foamed resin formed by the extrusion foaming method include "Kanelite ^(R) soil block" (manufactured by Kaneka Corporation).

The density of the cushioning material 7 is preferably 10 to 100 kg / ^{m 3,} more preferably 15~50kg / ^{m 3.} The density of the cushioning material 7 is calculated by “density of cushioning material (kg/m ³ )={mass of cushioning material (g)/volume of cushioning material (mm ³ )}×10 ⁶ ”.

The length of the cushioning material 7 in the horizontal direction (horizontal and perpendicular to the back surface of the structure 1) varies depending on the size of the concrete floor slab 3, the scale of the structure 1, the scale of an expected earthquake, and the like. It may be set according to the conditions or by conducting a model experiment. That is, the horizontal length of the cushioning material 7 may be set so that the back surface earth pressure applied to the structure 1 at the time of an earthquake becomes the same between the foamed resin material 4 portion and the cushioning material 7 portion. Specifically, the horizontal length of the cushioning material 7 is preferably 50 mm or more and 500 mm or less, and is 50 mm or more and 300 mm or less when the height of the lightweight embankment structure 2 is 3 m, for example. More preferably, when the height of the lightweight embankment structure 2 is 10 m, it is preferably 50 mm or more and 1000 mm or less, and more preferably 50 mm or more and 700 mm or less. Further, the horizontal length of the cushioning material 7 can be set at a ratio of 50 mm or more and 500 mm or less, preferably 100 mm or more and 300 mm or less per 10 m of the concrete floor slab in the horizontal direction. However, since the cushioning material 7 is light in weight, the upper limit of the horizontal length is 1000 mm so as not to impair the functions of the concrete floor slab 3 such as unevenness adjustment, load distribution, fixing of the foamed resin block, and buoyancy measures. Is preferred. The cushioning material 7 depends on the scale of the earthquake expected when the entire lightweight embankment structure 2 including the concrete floor slab 3 is moved (displaced) in the horizontal direction and a load is applied to the cushioning material 7, due to the earthquake. The load is dispersed and absorbed by being deformed (crushed) in the horizontal direction, and the concrete floor slab 3 reduces local load on the back surface of the structure 1 by excessive load. Here, that the cushioning material 7 is deformed (crushed) in the horizontal direction means that the length in the horizontal direction is reduced by about 3 to 80%, preferably about 10 to 60%. Since the cushioning material 7 is preferably formed of a material such as foamed resin, it does not completely plastically deform even if it absorbs a load, and is restored to a certain extent when the load is no longer applied (it tries to return to its original length). ).

As shown in FIG. 2(a), the cushioning material 7 may have a vertical thickness equal to the thickness of the concrete floor slab 3, or as shown in FIG. 2(b). In addition, although depending on the horizontal length of the cushioning material 7, the vertical thickness may be about 25 to 500% thicker than the thickness (100 to 300 mm) of the concrete floor slab 3, and is preferable. May be about 50-400% thick. Further, as shown in FIG. 2B, the cushioning material 7 depends on the length of the cushioning material 7 in the horizontal direction, but rather than the area of the surface 7 a in contact with the concrete floor slab 3, The area of the surface 7b in contact with the back surface of No. 1 is preferably larger, more preferably about 25 to 500%, further preferably about 50 to 400%. Further, the cushioning material 7 has not only a rectangular parallelepiped shape as shown in FIG. 2B, but also a structure from the concrete floor slab 3 side so that the load received from the concrete floor slab 3 can be sufficiently dispersed and absorbed. Various shapes such as a truncated pyramid shape (for example, a load distribution angle (θ): about 20°) that spreads toward the object 1 side may be used.

The lightweight embankment structure on the back surface of the structure in one embodiment of the present invention withstands the load of the foamed resin material and the concrete floor slab in the vertical direction, and includes the cushioning material 7 in the horizontal direction. Therefore, it is possible to show the buffering property of reducing the local load during an earthquake.

The lightweight embankment structure on the back surface of the structure according to the embodiment of the present invention can reduce the possibility that the concrete floor slab constituting the lightweight embankment structure locally applies an excessive load to the back surface of the structure during an earthquake. Therefore, it is possible to maintain the structure and the lightweight embankment structure, and further, for example, the road surface formed on the upper part of the lightweight embankment structure in a safe state (improve the earthquake resistance) even after the earthquake.

[Modification]
In addition, in order to further reduce the local load applied to the structure 1 by moving (displacement) the entire lightweight embankment structure 2 including the concrete slab 3 in the horizontal direction due to the earthquake, the concrete slab can be reduced as necessary. A cushioning material (not shown) may be further arranged between the 3 and the embankment (FIG. 1). The cushioning material may have the same configuration as the cushioning material 7 described above.

In addition, when the back side of the structure is cut soil, the reduction effect by further arranging a cushioning material between the concrete floor slab and the cut soil is the reduction effect when the back side of the structure is embankment. It becomes large in comparison. Therefore, when the back side of the structure is cut soil, the structure in which the cushioning material is further arranged between the concrete slab and the cut soil can further reduce the local load applied to the structure 1. It is effective.

Furthermore, in order to further reduce the load applied to the structure 1 by the entire lightweight embankment structure 2 during an earthquake, cushioning may be performed instead of the foamed resin material 4 over the entire surface of the lightweight embankment structure 2 on the structure 1 side, if necessary. Material (not shown) may be arranged. That is, the foamed resin material 4 in contact with the back surface of the structure 1 may be replaced with a cushioning material. The cushioning material may have the same configuration as the cushioning material 7 described above. If necessary, a cushioning material (not shown) may be arranged instead of the foamed resin material 4 over the entire surface of the lightweight embankment structure 2 on the embankment (FIG. 1) side. That is, the foamed resin material 4 in contact with the embankment may be replaced with the cushioning material.

Furthermore, when the structure 1 has, for example, a U-shape when viewed from the vertical direction (when there are a plurality of surfaces of the structure 1 with respect to the lightweight embankment structure 2), the structure 1 and In order to reduce the load applied to the structure 1 no matter how the lightweight embankment structure 2 moves (displaces) in the horizontal direction, the cushioning material 7 is provided over the entire surface of the lightweight embankment structure 2 on the structure 1 side. You may arrange.

The lightweight embankment structure 2 is trimmed because the cushioning material 7 is arranged between the concrete slab 3 and the structure 1. Therefore, in the lightweight embankment structure 2 according to the embodiment of the present invention, it is not necessary to sandwich the joint material for edging between the concrete floor slab 3 and the structure 1.

[Embodiment 2]
Hereinafter, a lightweight embankment structure on the back surface of a structure according to another embodiment of the present invention will be described with reference to FIG. The lightweight embankment structure shown in FIG. 3 exemplifies a case where the structure is an abutment. The same components as those of the lightweight embankment structure shown in the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

When the scale of the structure 1 is relatively large, and therefore the individual concrete floor slabs 3 constituting the lightweight embankment structure 2 are relatively large, the concrete floor slab 3 is usually a plurality of blocks (for example, a size of 10 m square). ). When the individual concrete slabs 3 forming the lightweight embankment structure 2 are relatively large, the local load applied to the back surface of the structure 1 by the concrete slabs 3 at the time of an earthquake also becomes relatively large.

Therefore, when the individual concrete slabs 3 are relatively large, in order to further reduce the local load applied to the back surface of the structure 1 by the concrete slab 3 during an earthquake, the concrete slab 3 and the structure In addition to disposing the cushioning material 7 between 1 and 1, it is preferable to further dispose the cushioning material 7 between the plurality of blocks. Specifically, for example, for every 10 m in the horizontal direction of the concrete floor slab 3, the cushioning material 7 is provided at a ratio such that the horizontal length is 50 mm or more and 500 mm or less, preferably 100 mm or more and 300 mm or less. It may be arranged between the plurality of blocks. The cushioning material 7 arranged between the plurality of blocks is preferably made of the same material as the cushioning material 7 arranged between the concrete floor slab 3 and the structure 1.

Further, the positions of the cushioning material 7 arranged between the plurality of blocks in the uppermost concrete floor slab 3 and the intermediate concrete floor slab 3 may be the same as each other when viewed in the vertical direction, or may be different from each other. (In FIG. 3, the case where the cushioning material 7 is arranged at the same position as seen from the vertical direction is shown as an example).

When the concrete floor slab 3 is composed of a plurality of blocks, the cushioning material 7 is further arranged between the blocks to further reduce the local load applied to the back surface of the structure 1 by the concrete floor slab 3 during an earthquake. can do. As a matter of course, in order to further reduce the load applied to the structure 1 by moving (displacement) the entire lightweight embankment structure 2 including the concrete slab 3 in the horizontal direction due to an earthquake, the concrete slab 3 and the embankment may be added as necessary. Also in the lightweight embankment structure on the back surface of the structure according to another embodiment of the present invention, such as disposing a cushioning material (not shown) between the lightweight embankment shown in FIG. A modified example similar to the structure configuration can be adopted.

In the lightweight embankment structure 2 according to another embodiment of the present invention, since the cushioning material 7 also functions as a joint material, it is not necessary to sandwich the joint material between a plurality of blocks in the concrete floor slab 3. ..

A lightweight embankment structure on the back surface of a structure in another embodiment of the present invention is a concrete structure that constitutes a lightweight embankment structure at the time of an earthquake even if the individual concrete slabs that compose the lightweight embankment structure are relatively large. Since the floor slab can reduce the excessive load locally applied to the back surface of the structure, even after the earthquake, the structure and the light-weight embankment structure, and further formed on the lightweight embankment structure, for example, It is possible to maintain the road surface in a safe condition (improve earthquake resistance).

[Other Embodiments]
The present invention may include a structure including, for example, an abutment, a concrete retaining wall, a seawall, etc., including the above-described lightweight embankment structure on the back surface of the structure according to one aspect of the present invention. Further, according to the present invention, there is provided a method (manufacturing method) for a lightweight embankment structure in which a lightweight embankment containing a foamed resin material is formed on the back surface of a structure, wherein at least a concrete floor slab of the lightweight embankment and the structure A construction method (manufacturing method) of the lightweight embankment structure on the back surface of the structure may also be included, which includes a step of disposing a cushioning material having a horizontal length of 50 mm or more between the structure and the object.

The present invention is not limited to the above-described embodiments, but various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments Is also included in the technical scope of the present invention.

The lightweight embankment structure on the back surface of the structure according to an aspect of the present invention maintains the structure and the lightweight embankment structure, and also the road surface formed on the upper portion of the lightweight embankment structure in a safe state even after an earthquake ( Since it can improve the earthquake resistance), it can be suitably used for the back surface of structures such as abutments, concrete retaining walls, and seawalls.

1 Structure 2 Lightweight embankment structure 3 Concrete floor slab 4 Foam resin material 7 Buffer material

Claims (7)

A lightweight embankment structure formed by forming a lightweight embankment containing a foamed resin material on the back surface of the structure,
A lightweight back surface of a structure, in which a cushioning material that is horizontal and has a length of 50 mm or more in a direction orthogonal to the back surface of the structure is disposed between at least a concrete floor slab of the lightweight embankment and the structure. Embankment structure (excluding lightweight embankment structure in which columns are erected between the concrete floor slab and the structure above) . The lightweight embankment structure on the back surface of the structure according to claim 1, wherein the cushioning material has a vertical compressive strength of 10 to 1000 kN/m ² . The maximum compressive strength of the cushioning material within a strain of 10% in a direction that is horizontal and orthogonal to the back surface of the structure is 70% or less of the compressive strength in the vertical direction. Lightweight embankment structure on the back of the structure. The lightweight embankment structure on the back surface of the structure according to claim 1, wherein the cushioning material is an extruded foam. The lightweight embankment structure on the back surface of the structure according to any one of claims 1 to 4, wherein the cushioning material has a larger area in contact with the back surface of the structure than in contact with the concrete floor slab. The lightweight embankment structure on the back surface of the structure according to claim 1, wherein the concrete floor slab is composed of a plurality of blocks, and a cushioning material is further arranged between the blocks. A lightweight embankment structure formed by forming a lightweight embankment containing a foamed resin material on the back surface of the structure,
A cushioning material having a length of 50 mm or more, which is horizontal and is orthogonal to the back surface of the structure, is disposed between at least the concrete floor slab of the lightweight embankment and the structure.
A lightweight embankment structure on the back surface of a structure, wherein the concrete floor slab is composed of a plurality of blocks, and a cushioning material is further arranged between the blocks.

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