JPH0465934B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a lightweight embankment construction method for constructing an embankment base using foamed resin blocks, and more specifically relates to improving the coating layer of the embankment base. .

(Prior Art) In recent years, when constructing roads on soft ground or on steep slopes, lightweight embankment construction methods have gradually come into use, in which instead of embanking, foamed resin blocks are stacked as a base for the embankment.

The advantages of this lightweight embankment construction method are that the foamed resin blocks are extremely lightweight (approximately 1/100th of ordinary earth and sand), making them easy to work with, reducing the embankment load, and reducing foundation ground settlement. Because the resin blocks are self-supporting, the lateral pressure can be reduced compared to conventional embankments, so there is less risk of slopes collapsing, so there is less impact on existing structures.Large machinery is required. Because it does not require construction, it is possible to carry out construction work close to important structures, and there is less impact on the surrounding environment.

Figures 6 to 8 show the construction procedure for this lightweight embankment.
To explain with reference to the figure, for example, in soft ground A, the foundation ground 11 is leveled by excavating with a power shovel as necessary. Laying sand 12 is applied on top of this foundation ground 11. This laying of sand is done to stabilize the foundation ground 11 and to protect the foamed resin blocks, which will be described later.

Foamed resin blocks 13 are spread on the sand bed 12 in an appropriate arrangement to form a foamed resin block layer 14. Furthermore, a similar foamed resin block layer 1 is placed on top of this.
4a, 14b, . . . are stacked to form a plurality of foamed resin block layers. In this case, in order to prevent the foamed resin blocks from slipping from each other, a connecting metal fitting 15 (see FIG. 7) is inserted as shown in FIG. 8 to form an embankment base 16.

To construct the covering material over the top surface and both sides of the embankment base 16, wire mesh 17 (not shown) is attached.
Furthermore, a covering layer 19 is formed by spraying mortar 18 (not shown) or applying an asphalt sheet.

After this, the foundation ground 11 is backfilled, and the cover soil layer 20
The surface layer 22 is formed by constructing the floor slab concrete 21 and casting the concrete floor slab 21.

(Problem to be Solved by the Invention) However, in such conventional lightweight embankment construction methods, the foamed resin used as the embankment base has low durability against acids and oils, so it must be covered. It was hot. Therefore, when forming the covering layer 19 of the embankment base 16, in order to use a wire mesh to prevent mortar from peeling off, the wire mesh must be carried in and installed, resulting in a problem of low work efficiency. .

The present invention was developed in view of the above problems, and by not using a wire mesh for the coating layer, the installation work of the wire mesh is omitted and workability is improved, and the present invention has excellent adhesive strength, impact resistance, and waterproof property. The purpose of the present invention is to provide a lightweight embankment construction method that improves the durability of an embankment base by forming a protective covering layer.

(Means for Solving the Problems) The gist of the present invention for achieving the above-mentioned objects is as follows:
A foamed resin block layer is formed by laying foamed resin blocks in an appropriate arrangement on the foundation ground, and multiple layers of such foamed resin blocks are formed, and the upper and lower foamed resin blocks are tied together to form a base for embankment. In the lightweight embankment construction method, which is constructed by forming a covering layer by covering the outer surface of the embankment base with a covering material, and then backfilling the foundation ground and placing concrete slabs, A mortar containing a mixture containing calcium chloride as a main component and at least one salt selected from iron salts, potassium salts, and ammonium salts as an auxiliary component is applied to the outer surface of the embankment base to form the coating layer. It is a lightweight embankment construction method that is characterized by the following.

(Function) According to the lightweight embankment construction method of the present invention, after forming the foundation ground, mortar is sprayed onto the sand, and foamed resin blocks are spread on top of this in an appropriate arrangement to form a foamed resin block layer. Similar foamed resin block layers are interconnected with connecting fittings to form a base for embankment.

After that, the above-mentioned special mortar is applied to the outer surface of the embankment base by a known method such as troweling or spraying to form a covering layer, and then backfilling of the foundation ground, construction of covering soil, and floor slabs are performed. This involves finishing the surface layer by applying concrete, etc.

In the construction method of the present invention, the special mortar admixture component used to form the covering layer of the embankment base is strongly bonded with calcium hydroxide produced by hydration of the cement in the mortar, making the mortar waterproof. It provides properties, improves strength, chemical resistance, etc., and has the function of protecting the foamed resin blocks that make up the base for embankments, but it is harmless to humans and animals, and therefore does not cause environmental pollution.

(Example) An example of the lightweight embankment construction method according to the present invention will be described with reference to FIGS. 1 to 5.

Fig. 1 shows the construction procedure of the lightweight embankment method, in which soft ground A is leveled by excavating with a power shovel or the like as needed to level the foundation ground 1, and then bedding sand 2 is applied.

Next, a mortar 3 containing a mixture 3a containing calcium chloride as a main component and ferrous sulfate as an auxiliary component in an amount of 10% by weight relative to the calcium chloride is prepared, and this is applied to the bedding sand 2 with a spray gun. Spray on top to form a mortar layer of desired thickness.

Next, the foamed polystyrene blocks 4 are brought in and pressed while being spread in an appropriate arrangement on the mortar 3 to form a foamed polystyrene block layer 5, and the lower surface thereof is joined to the mortar layer.

Furthermore, a styrofoam block layer 5,5 is placed on top of this.
... are stacked to form multiple layers of foamed resin block layers. In this case, the upper and lower foamed polystyrene blocks 4, 4, . . . are connected by connecting fittings 6 to form a base 7 for embankment in order to prevent the foamed polystyrene blocks from shifting from each other.

Thereafter, the mortar 3 is sprayed onto the outer surface of the embankment base 7 using a spray gun to form a coating layer 8 of a required thickness.

Then, backfilling the foundation ground 1 and covering soil layer 9
This process involves forming concrete slabs and placing concrete slabs 10.

The composition of the mixture 3a blended into the mortar 3 is not limited to the above, but has calcium chloride as its main component, and contains iron salts (e.g. iron sulfate, iron chloride, etc.), potassium salts (e.g. carbonate, etc.). It is sufficient that at least one of potassium, potassium chloride, etc.) and ammonium salts (for example, ammonium chloride, ammonium sulfate, etc.) are added as an auxiliary component in an amount of 0.3 to 30% based on the calcium chloride. Further, in order to mix the above-mentioned mixture 3a into mortar, it is also preferable to dissolve the mixture 3a in clean water (well water, tap water, etc.) and use it as a substantially uniformly dispersed liquid. In this case, dissolve the mixture in fresh water to prepare a solution with a high concentration of the mixture, and dilute it 2 to 20 times with fresh water depending on the waterproofness and coating thickness required during use. It is mixed into a required amount of mortar, kneaded, and applied to a foamed resin block by a coating method such as troweling or spraying, or by adjusting the number of coatings.

In this example, it was applied to soft ground, but as shown in Figures 3 to 5, embankments on steep slopes,
Of course, it can be applied to structures such as widening embankments and backing abutments.

In these figures, 8' is a covering layer formed by applying mortar, 23 is an earth retaining anchor, 24 is a simple wall protection material, and 25 is a bridge abutment, and the same symbols correspond to each other. This indicates the part to be used.

(Effects of the invention) According to the lightweight embankment construction method of the present invention, instead of the conventional coating layer that covers the embankment base with wire mesh and mortar or asphalt sheet (waterproof sheet), a mixture containing calcium chloride as the main component is used. Since the material is mixed with mortar and a covering layer is formed using the mortar, the base for embankment is strongly protected and has high durability with excellent waterproofness and chemical resistance, and the work of forming the covering layer is simple. As a result, it is possible to improve the workability, and in some cases, it is possible to eliminate the need for the formation of cover soil and the need for wall protection materials, which were conventionally required when the sides of the embankment base are exposed. be.

[Brief explanation of the drawing]

1 to 5 show examples of the lightweight embankment construction method according to the present invention, FIG. 1 is an explanatory diagram showing the construction procedure of the construction method according to the present invention, FIG. 2 is an enlarged cross-sectional view of a part of the same, Figure 3 is a cross-sectional view when embanking on a steep slope, Figure 4 is a cross-sectional view when the embankment is widened, Figure 5 is a cross-sectional view when the abutment is backfilled, and Figures 6 to 8
The figures show a conventional lightweight embankment construction method; FIG. 6 is an explanatory diagram showing the procedure, FIG. 7 is a perspective view of a connecting fitting, and FIG. 8 is a sectional view showing the state of use of the connecting fitting. 1... Foundation ground, 2... Sand, 3... Mortar, 4... Styrofoam block, 5... Styrofoam block layer, 6... Connection fittings, 7...
Embankment base, 8...covering layer.

Claims (1)

[Claims] 1. A foamed resin block layer is formed by laying foamed resin blocks in an appropriate arrangement on the foundation ground, and multiple layers of such foamed resin blocks are formed and the upper and lower foamed resin blocks are tied together to form a base for embankment. In the lightweight embankment construction method, which is constructed by forming a covering layer by covering the outer surface of the embankment base with a covering material, and then backfilling the foundation ground and placing concrete slabs. , applying a mortar containing a mixture containing calcium chloride as a main component and at least one salt selected from iron salts, potassium salts, and ammonium salts as an auxiliary component to the outer surface of the embankment base to cover the embankment; A lightweight embankment method characterized by its layered construction.