JP3751855B2 - Lightweight embankment structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lightweight banking structure using a resin foam block as a lightweight banking material.
[0002]
[Prior art]
A light-weight embankment method using a light-weight embankment material such as the EPS method is known as one of embankment methods on soft ground or landslide land. This construction method is widely used in various civil engineering works because it exhibits excellent effects in terms of cost reduction for ground improvement, shortening the construction period, and improving earthquake resistance. FIG. 3 is a cross-sectional view showing an example of the case where the lightweight embankment method is used for road widening work, and a polystyrene foam block (EPS block) is used as a lightweight embankment material.
[0003]
In this example, the existing road 1 made in the middle abdomen is widened to the slope side of the existing ground, and the support ground 3 side is maintained at an appropriate inclination angle, and then the H-section steel 2 is installed. The EPS block 4 is stacked between the H-shaped steel 2 and the supporting ground 3 to form a banking portion having a predetermined height in which the surface opposite to the inclined surface is a substantially vertical surface. After that, a concrete floor slab 5 is made on the entire surface of the stacked EPS block 4 as a finished structural material, and then a roadbed 8 and asphalt 9 are applied to the road to widen the road. Construction is complete. In the figure, reference numeral 6 denotes an anchor, which is fixed to the concrete floor slab 5 via an anchor head 5a, and maintains the stabilization of the lightweight embankment structure.
[0004]
Usually, since the resin foam such as the EPS block 4 is not sufficiently weather resistant, an appropriate weather resistance treatment is applied to the side surface of the stacked resin foam block. In the above, the wall surface protective material 7 having weather resistance such as a lightweight concrete plate is attached using the H-shaped steel 2. As another example, it has also been proposed to fix a truss wire mesh to an H-shaped steel as a support and to spray mortar over the entire surface (Japanese Patent Laid-Open No. 7-34462).
[0005]
On the other hand, in recent years, it has been known that resin foam blocks such as EPS blocks have sufficient frictional resistance between them and are sufficiently self-supporting, and support columns (H Lightweight embankment in which resin foam blocks are stacked in multiple stages so that one side becomes a substantially vertical wall, and finished structural materials such as concrete floor slabs and roadbeds are placed on the top surface. Structures are also actually being constructed. Since this construction method does not include H-section steel, it can be expected that the construction cost will be greatly reduced, and it has high potential.
[0006]
[Technical Problem to be Solved by the Invention]
By the way, a resin foam block such as an EPS block is an elasto-plastic body. When a concrete floor slab, roadbed, asphalt pavement, etc. are stacked on the EPS block as finishing work, the EPS block sinks (the thickness of each block is 1). ~ About 2%). Therefore, in the conventional construction method, as described above, a retaining wall made of a weather-resistant material is constructed using H-shaped steel as a structural material built on the wall surface of the resin foam block, and the deformation due to compression of the resin foam block ( The effect of subsidence does not act on the retaining wall. If an inorganic material surface material is formed by fixing a lightweight concrete board directly to the wall surface of the stacked resin foam block or spraying mortar, the surface material is not an elastic plastic material. Due to the sinking of the body block, it is inevitable that the fixed lightweight concrete board will come off and that the mortar retaining wall will be peeled off and cracked.
[0007]
FIG. 4 is a conceptual diagram for explaining a phenomenon in which peeling or cracking occurs in a surface material such as a mortar retaining wall. Fig. 4a shows a mortar retaining wall constructed on the stacked EPS block, and no finished structural material such as a concrete floor slab as a load source is formed, and the EPS block is not loaded. It is. In Fig. 4b, a finished structural material such as a concrete floor slab is formed, and due to the influence of the load, each block undergoes a compressive deformation that bulges in the lateral direction with a thickness of about 1 to 2%. This indicates a phenomenon in which the mortar retaining wall is peeled off when the space between the walls is weak. FIG. 4c shows a phenomenon in which cracking occurs in the mortar retaining wall when the adhesion between the EPS block and the mortar retaining wall is strong.
[0008]
Therefore, how to construct a retaining wall for providing weather resistance is an urgent issue in the lightweight embankment method that is performed without building up the struts (H-shaped steel) that function as structural materials. There is a need for an effective solution. The present invention aims to solve the above-mentioned problems. More specifically, even when an inorganic material surface material is directly applied to the wall surface of the resin foam block, the resin foam block is deformed (sinked). An object of the present invention is to provide an improved lightweight embankment structure in which the surface material is not adversely affected.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the lightweight embankment structure according to the present invention is configured such that resin foam blocks are stacked in multiple stages so that one side surface is a substantially vertical wall surface, and a finished structure material such as a roadbed is disposed on the upper surface. In the light-weight embankment structure, the four circumferences of the wall-side surface of the resin foam block constituting the wall surface are inwardly inclined surfaces, and the resin foam blocks adjacent to each other are on the wall surface side. A non-contact region of a certain depth is formed, and the finished structural material is not formed above the non-contact region of the multi-stage stacked resin foam block, and the multi-stage stacked resin foam block The surface constituting the wall is coated with an inorganic surface material.
[0010]
In the lightweight embankment structure according to the present invention, the resin foam blocks adjacent to each other have a constant depth (preferably, the thickness of each block is 3% or more of the thickness of each resin foam block on the wall surface side. 5 to 15%) non-contact region is provided on the four circumferences. And finishing structural materials, such as a concrete floor slab which is a load source with respect to a resin foam block, are not formed above the said non-contact area | region of the resin foam block piled up in multiple steps. For this reason, even if a compressive deformation occurs in each resin foam block that swells in the lateral direction of about 1 to 2% of the thickness due to the effect of the finished structural material after construction, non-contact with a depth of 3% or more of the thickness of each block If there is a region, the influence is mitigated on the wall side surface of the resin foam block, and the load of the finished structure material directly acts on the inorganic material surface material formed on the wall side surface. Therefore, the surface material is always placed in a stable state, and no peeling or cracking occurs.
[0011]
Therefore, for example, by spraying mortar, the surface material can be easily formed on the wall surface side of the resin foam block, and the formed surface material can maintain a stable state for a long time. If an uneven pattern (such as an accumulated stone or rock pattern or a geometric pattern) is formed in advance on the surface of the resin foam block, the mortar should be applied from the top. By spraying, the side wall surface of the lightweight embankment structure can be made rich in design.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows in cross section the main part of a lightweight embankment structure according to the present invention. In this lightweight embankment structure, the supporting ground 3 side is maintained at an appropriate inclination angle in the same manner as in the conventional method shown in FIG. Thereafter, without embedding the H-shaped steel as the support member, the resin foam blocks (for example, EPS blocks) 4 are stacked in multiple stages so that the surface opposite to the inclined surface becomes a substantially vertical wall surface. Form a bank of height.
[0013]
Thereafter, a concrete floor slab 5 is formed, and the concrete floor slab 5 is fixed to an anchor 6 embedded in the ground via an anchor head 5a. On top of that, as in ordinary civil engineering work, a roadbed 8 or asphalt is fixed. Applying finishing work such as 9 is similar to the conventional lightweight embankment method.
[0014]
In the lightweight embankment structure according to the present invention, among the stacked resin foam blocks 4, four rounds of the wall-side surface 11 in the resin foam block 4a that constitutes the wall surface are inclined surfaces 12 inward. Accordingly, the four circumferences of the resin foam blocks 4a adjacent to each other on the side of the wall surface 11 have a depth H (preferably, the thickness of the block 4a of 3% or more of the thickness of each block 4a). The non-contact area 13 of about 5 to 15% is formed.
[0015]
Further, as shown in FIG. 1, the finished structural material (concrete floor slab 5, roadbed 8, asphalt 9, etc.) is not formed above the non-contact area 13 of the resin foam block 4a stacked in multiple stages. In addition, the surface 11 constituting the wall surface of the resin foam block 4a stacked in multiple stages is formed with irregularities as appropriate patterns, and mortar is blown from the surface to form an inorganic material system. The surface material 14 is coated.
[0016]
In the lightweight embankment structure according to the present invention having the above-described structure, a compressive deformation that bulges in the lateral direction of about 1 to 2% of the thickness occurs in each resin foam block 4 or 4a after the construction due to the influence of the load of the finished structural material. However, the influence is mitigated by the non-contact region 13 having a depth H of 3% or more of the thickness of each block 4a, which is present in the four circumferences of the wall-side surface 11 of the resin foam block 4a constituting the wall surface side. The Further, since the load of the finished structural material does not directly act on the inorganic material-based surface material 14 formed on the wall surface 11, the surface material 14 is always placed in a stable state, It is avoided that the surface material 14 is peeled off or cracked.
[0017]
【The invention's effect】
In the lightweight embankment structure according to the present invention, even when an inorganic material-based surface material is directly formed on the surface constituting the wall surface of the resin foam block, the surface material is not peeled off or cracked. Therefore, a weatherable surface material can be easily formed by, for example, mortar spraying, and the formed surface material is maintained in a stable state for a long time. If accumulated stone or rock-like patterns, geometric patterns, etc. are formed in advance, the side wall surface of the lightweight embankment structure is blown to the design by spraying mortar on it. Can be.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of a lightweight embankment structure according to the present invention.
FIG. 2 is a conceptual diagram for explaining a wall-side surface in a resin foam block that constitutes a wall surface.
FIG. 3 is a cross-sectional view illustrating a conventional lightweight embankment structure.
FIG. 4 is a conceptual diagram for explaining a phenomenon in which peeling or cracking occurs on a surface material.
[Explanation of symbols]
4, 4a ... foamed resin block, 5 ... concrete floor slab, 8 ... roadbed, 9 ... asphalt pavement, 11 ... wall surface side surface in resin foam block, 12 ... inclined surface to the inside, 13 ... non-contact area, 14 ... Inorganic material surface material

Claims (2)

In a lightweight embankment structure in which resin foam blocks are stacked in multiple stages so that one side surface is a substantially vertical wall surface, and a finishing structure material such as a roadbed is arranged on the upper surface, the resin foam block that constitutes the wall surface 4 rounds of the surface on the wall surface side are inclined surfaces inwardly in the direction of decreasing the area of the surface, and the resin foam blocks adjacent to each other are in the thickness of each resin foam block on the wall surface side. 3% or more of the non-contact region having a depth of 3% or more, and the finished structural material is not formed above the non-contact region of the resin foam block stacked in multiple stages and is stacked in multiple stages. A lightweight embankment structure characterized in that an inorganic material surface material is coated on the surface of the resin foam block that constitutes the wall surface.   The lightweight embankment structure according to claim 1, wherein an uneven pattern is formed on a surface of the resin foam block that constitutes the wall surface.

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