JPH02171424A - Foamed synthetic resin mold composite block and lightweight banking structure using the former - Google Patents

Abstract

PURPOSE:To enhance the compression stress and bending stress by laying and stacking a composite block in which a reinforcing section is provided on the outer surface of a foamed synthetic resin mold block body with the reinforcing section being positioned on a side remote from a load receiving side. CONSTITUTION:A reinforcing section 2 formed from a low-foamed part, a fabric part or the like is laid on the outer surface of a foamed synthetic resin mold block body 1 or in the vicinity thereof so as to form a composite block B which is then laid and stacked at the position of a banking structure with the reinforcing section 2 being located on a side remote from the load receiving side. With this arrangement, risks of land subsidence and land slip may be eliminated, and further troubles such as cracks or the like may be prevented even though it is used in, for example, a curved road which requires a higher bending strength, thereby it is possible to greatly enhance the durability.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a synthetic resin foam molded composite block and a lightweight embankment structure using the same, and more specifically, to a synthetic resin foam molded block with enhanced compression and bending strength and This article relates to a light 1 embankment structure using it.

[Conventional technology and problems]

Traditionally, embankments on soft ground, widening of embankments, embankments on steep slopes, backfilling of structures, etc. have had serious problems such as ground subsidence and landslides due to earth pressure, and in recent years, efforts have been made to solve these problems. Therefore, a so-called lightweight embankment method using Styrofoam has been proposed. This construction method aims to reduce soil pressure on soft ground by using lightweight polystyrene foam instead of heavy earth and sand or concrete, thereby solving problems such as ground subsidence and landslides.

However, Styrofoam is inferior in strength compared to earth and sand or concrete, especially in bending strength and tensile strength.
When it is laid on ground with uneven strength or on a curve of a road, there is a problem that it may break or crack. It has also been pointed out that foam molded blocks are expensive.

[Means for solving problems]

In view of these circumstances, the present invention provides a synthetic resin foam molded block with improved strength, especially bending strength, suitable for the above-mentioned uses, and a lightweight embankment structure using the same.

That is, the first aspect of the present invention is a composite block in which a reinforcing portion is provided on the surface or the vicinity of the synthetic resin foam molded block body, and the second aspect of the present invention is a lightweight embankment structure using a synthetic resin foam molded block. , a lightweight embankment structure characterized in that a composite block comprising a reinforcing section provided on the surface or near the surface of a synthetic resin foam molded block body is laid and laminated with the reinforcing section positioned on the opposite side of the load receiving side, The third aspect of the present invention is a light FFI embankment structure using synthetic resin foam molded blocks, in which a composite block is provided in the upper layer with a reinforcing part on the surface of the synthetic resin foam molded block main body or in the vicinity thereof. Each of these is a lightweight embankment structure characterized by being laid and laminated so that it is located on the side that receives the load.

(Example) Synthetic resins used in the present invention include polystyrene resins, polyethylene, polypropylene, polyolefin resins such as ethylene-propylene copolymer resins, and polyurethane resins, among others, they are lightweight and durable. Polystyrene-based resins, which are inexpensive and have a good balance of compressibility, heat resistance, heat insulation, chemical resistance, etc., are suitable.

As the reinforcing part used in the present invention, a low foaming part with a lower foaming ratio than the main body of the synthetic resin foam molded block (hereinafter referred to as the block main body), a fiber or metal net, YA fabric, etc. are suitable, and these are suitable for the block body. Provided on or near the surface of the main body.

In the case of the above-mentioned low expansion ratio, a plate-shaped body with a low expansion ratio may be attached by adhesion, fusion, welding, etc. However, a plate-shaped body with a low expansion ratio is prepared in advance, and this is placed inside the block molding mold. A convenient method is to set the block in advance by means such as supporting or inserting it, then introduce and fill the block with high-magnification pre-foamed beads for the block body, and heat and fuse the beads to form the block. In the case of nets and knitted fabrics, in addition to the above-mentioned methods, methods of adhesion such as adhesion, fusing, welding, etc. are used. The appropriate thickness of the low-foaming part is selected depending on the desired bending strength. However, as the thickness of the low-foaming part increases, the amount of synthetic resin used increases, which increases the cost, so the best balance between the desired bending strength and cost is selected. It is desirable to decide to do so. For nets and W1 fabrics, the type of metal, type of fiber, denier, etc. are selected depending on the desired bending strength.

The composite block of the present invention can be suitably used in conventional applications of synthetic resin foam molded blocks, particularly in applications where bending strength is required. In particular, it is suitable for civil engineering fields such as embankments and retaining walls, and composite blocks used in such fields are, for example, 920 mm long x 1810 mm wide x 420 mm high, 1010 mm long x 2015 mm wide x 510 fins, etc. size will be adopted.

The present invention will be explained based on the drawings.

1 to 4 respectively show examples of the composite block of the present invention, and FIG. 1 shows a composite block in which a reinforcing part (2) made of a low foaming part is provided on one side of the surface of the block body (1), Figure 2 shows a composite block in which reinforcing parts (2) and (2) made of low foam parts are provided on both sides of the block body (1), and Figure 3 shows a reinforced block made of fabric on one side of the block body (1). Figure 4 shows a composite block in which reinforcing parts (4) made of net are provided near both sides of the block body (1).

Next, an experimental example will be shown to show how the bending strength is enhanced by providing a low foaming portion in the block body.

Experimental example Styrofoam block 5 obtained by block molding
From 0x product, blank sample height 80 x length 30
Cut out 50 fins of 0 length x medium size, apply a load (W) with a support span of 200 meters to the sample (S) as shown in Figure 5, and
Bending strength (K) was measured in accordance with ISA9511.

A constant strain rate universal testing machine (manufactured by Tokyo Shikenki 5C-02CDS) was used as a measuring machine, and the bending strength was calculated using the following formula.

K = (3xWx#) / (2xbxh”) K: Bending strength W: Load 1: Sample length b = Sample width h: Sample height (thickness) The blank sample has a load (W) of 42.7 kg. The bending strength (K) was 4.0 kg/-.

Next, as a low foaming part, a product with a thickness of 30 times 20 + n and a product with a thickness of 20
After preparing double products and attaching them to the movable side mold of the block molding machine, 50 times Shinagawa pre-foamed beads are filled into the mold as the block body and integral molding is performed. , Table 1 to 4. Cut out the block body (1) and the reinforced part (low foamed part) with different thicknesses as shown in Table 4, and cut out the block body (1) and the reinforced part ( A composite block sample consisting of 2) was obtained, and its bending strength was measured in the same manner as the blank sample. The results are shown in Tables 1 to 4.

*Since the reinforcing parts are provided on both sides of the block body, the total thickness is twice the value of each value. 8, Table 3), a composite block (Fig. 6, Table 3) in which the reinforcing portions are unevenly distributed on one or both sides of the block body, and the reinforcing portions are located at least on the side opposite to the side receiving the load (Fig. 6, Table 3). Table 1, FIG. 9, and Table 4) show a remarkable improvement in bending strength.

Thus, when the composite block of the present invention is used in an embankment construction method, a composite block having a reinforcing part on one or both sides of the block body is used, and the reinforcing part (or at least one reinforcing part when having reinforcing parts on both sides) is used. The bending strength can be more effectively increased by arranging the structure in such a way that it is placed on the opposite side of the load receiving side and is laminated.

Fig. 10 shows an example of widening the embankment, and the composite block (B) of the present invention has the reinforcing part (2) on the opposite side to the side receiving the load.
That is, it is arranged so as to be located below. (5) is earth and sand, (6) is concrete, (7) is asphalt, (
8) is the anchor and (9) is the frame.

Figure 11 shows an example of a steeply sloping embankment.In the upper layer where not only bending strength but also compressive strength is required, a composite block (B') with reinforcement parts (2) on both the upper and lower sides is laid. In the lower layer, composite blocks (B) each having a reinforcing portion (2) on the lower side are laid and laminated.

That is, at least the reinforcing portion (2) is arranged so as to be located on the opposite side (lower side) of the load side.

In the upper layer of the above structure, at least in the uppermost stage, a pressure of 1i
! When paying more attention to strength, a composite block (B) having a reinforcing portion only on one side may be arranged such that the reinforcing portion is placed on the load side, that is, on the upper side. In this case, since the load is distributed over a wide range, it can sufficiently withstand even if the foaming ratio of the main body is further increased, and therefore, further cost reduction can be achieved.

[Action/Effect]

As mentioned above, the present invention provides a joint block with excellent compressive strength and bending strength, and is suitable for use in applications of synthetic resin foam molded blocks that require compressive strength and bending strength. .

The present invention also provides an embankment structure using the above-mentioned composite block, which is free from the risk of ground subsidence and landslides, and which prevents troubles such as cracks even when used on curved roads that require bending strength, and is durable. Sexuality is greatly improved.

[Brief explanation of the drawing]

Figures 1 to 4 are schematic diagrams showing examples of the composite block of the present invention, Figures 5 to 9 are schematic diagrams showing sample blocks and the state of measurement of bending strength, Figures 1O and 11 Each figure is a schematic diagram showing an example of an embankment structure using the composite block of the present invention. 1...Block body 2...Reinforcement part made of a low foam part 3...Reinforcement part 4 made of fabric...Reinforcement part 5 made of net 5...Earth and sand, 6...Concrete 7... Asphalt, 8... Anchor 9... Frame B, B'... Composite block Patent applicant Kanekabuchi Chemical Industry Co., Ltd. Figure 1 Figure 3 Figure 2 Figure 4 Figure 7 Figure 7 Figure 9

Claims (1)

[Claims] 1. A composite block in which a reinforcing portion is provided on or near the surface of a synthetic resin foam molded block body. 2. The composite block according to claim 1, wherein the reinforcing portion comprises a low foaming portion having a foaming ratio lower than that of the block main body. 3. The composite block according to claim 1, wherein the reinforcing portion is made of a net-like material or a knitted fabric. 4. The composite block according to any one of claims 1 to 3, which is used for civil engineering and construction. 5. The composite block according to claim 4, which is used for embankment construction method. 6. In the structure of a lightweight embankment using synthetic resin foam molded blocks, a composite block comprising a reinforcing portion provided on or near the surface of the synthetic resin foam molded block body is located on the opposite side of the side where the reinforcing portion receives the load. A lightweight embankment structure characterized by being laid and laminated. 7. In the structure of a lightweight embankment using synthetic resin foam molded blocks, a composite block is provided in the upper layer with a reinforcing part on or near the surface of the synthetic resin foam molded block main body, on the side where the reinforcing part receives the load. A lightweight embankment structure characterized by being laid and laminated.