JP2001140260A - Light-weight civil engineering material and light-weight structure using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weight civil engineering material which can be used as the filling material of roads, housing sites, port facilities, or railways, the back-fill material or drainage material of retaining walls or structures, can be dealt with easily, and has a light-weight and superior durability and a light-weight structure using the material. SOLUTION: The light-weight civil engineering material is obtained by vertically and horizontally arranging plate-like ingots 12 which are reduced in volume by thermally melting and solidifying an expanded resin material in a cloth bag 13 and uniting the ingots 12 in one body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
The present invention relates to a lightweight civil engineering material that can be used as an embankment or retaining wall for a port facility or a railway, a backfill material for a structure, or a drainage material, and a lightweight structure using the same.

[0002]

2. Description of the Related Art
Embankment of roads, residential land development, harbor facilities, railways, etc. 1
(FIG. 8), retaining wall 2 (FIG. 9), styrofoam block 4
Structures such as embankments 3 (FIG. 10) using (EPS blocks) have been constructed by embedding civil materials 5 such as earth and sand and rocks on the ground 6 while compacting them to a predetermined height.

[0003] However, when the ground on which these structures are constructed is soft ground, the civil engineering materials constituting the structures themselves are cumbersome to handle and have a heavy unit weight, so depending on the scale and shape of the structures. In some cases, the load imposed on the structure acts on the ground, causing consolidation settlement in the direction of gravity.

[0004] Also, as a backfill material 5 disposed on the back of the structure such as the embankment 3 and the retaining wall 2 and a drainage material disposed in a layered manner in the structure, civil materials such as earth and sand and rocks are used. As a result, there have been problems such as complicated handling, subsidence of the ground supporting the structure due to heavy unit weight, and generation of earth pressure on the structure.

The present invention has been made in view of the above problems, and has as its object to provide a light-weight civil engineering material having good handleability, light weight, and excellent durability, and a light-weight structure using the same. It is the purpose.

[0006]

In order to achieve the above object, the present invention provides a lightweight civil engineering material characterized in that a plurality of heat-melted solidified products obtained by hot-melting a foamed resin material are stored in a bag. And a lightweight structure using the lightweight civil engineering material.

Examples of the foamed resin material used for the lightweight civil engineering material of the present invention include polyurethane, polyvinyl alcohol, polyvinyl chloride, chlorinated polyethylene, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polymethyl methacrylate, Polymers such as polystyrene, styrene-butadiene-acrylonitrile copolymer, polyvinyl formal, epoxy, phenol, urea, and silicone, or acrylic rubber (ACR), acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), butadiene Rubber-based polymers such as rubber (BR), natural rubber (NR), isoprene rubber (IR), and chloroprene rubber (CR) are used as raw materials, and these are formed using a conventionally known bubble generating means, that is, a pyrolytic foaming agent. Bubble generation means, volatile solution Can be mentioned bubble generating means, or an inert gas under high pressure is absorbed in the polymer, those obtained by foam molding using such bubble generating means for foaming at normal pressure was used.

The lightweight civil engineering material is not limited to one of the above-mentioned foamed resin materials, and two or more foamed resin materials can be mixed. In addition, used foams such as fish boxes, trays, and packing materials for home appliances can be used as the foamed resin material. In this case, material costs can be significantly reduced and environmental pollution can be prevented through effective use of industrial waste. Can contribute.

The hot-melt solidified product is an ingot or a crushed product thereof which is reduced in volume by hot-melting and solidifying the above-mentioned foamed resin material, and has a foamed structure of the original foamed resin material inside the hot-melt solidified product. Is still present. The degree of heat melting of the heat-melt solidified product, in other words, the degree of volume reduction is arbitrary, but the unit weight is preferably about 1.0 t / m ³ or less. This is because, while the unit weight of the earth and sand which is a conventional civil engineering material is approximately 1.8 t / m ³ , when the unit weight of the hot-melt solidified material is about 1.0 t / m ³ , The unit weight of light-weight civil engineering materials using slabs has also been greatly reduced, and problems such as "consolidation settlement of the ground", "retracted settlement", or "generation of earth pressure" on structures have been caused by the heavy unit weight. Can be resolved.

[0010] Further, the heat-melt solidified material has increased strength and durability as compared with the original foamed resin material due to the heat melting.

The hot-melt solidified product can leave the original foamed resin material as it is by simply hot-melting and solidifying the foamed resin material. At this stage, the foamed resin materials can be joined together to form a desired shape such as a block shape, a plate shape, or a column shape.

The first purpose of the bag is to store the hot-melt solidified product and integrate the hot-melt solidified product. The bag can be made of a permeable bag such as a woven fabric, a knitted fabric, or a woven fabric, a net woven from a plastic wire or a fiber yarn, or a wire mesh. It can be appropriately determined in consideration of the use form and use location of the lightweight civil engineering material.

[0013] The lightweight structure of the present invention uses the lightweight civil engineering material described above as part or all of the embankment material or backfill material of the structure. The use of lightweight civil engineering materials reduces the weight of the structure, and even if the load applied to the structure acts on the ground, phenomena such as "consolidation settlement", "pull-in settlement", and "earth pressure generation" occur. It has become difficult. In addition, the usage ratio and application location of the lightweight civil engineering material in the structure may be appropriately determined in consideration of the strength and soil properties of the ground, the scale and shape of the structure, and the like.

Specific examples of the lightweight structure include an embankment, an embankment (widening), a backside of a retaining wall, a backside of an abutment, and an embankment on a rock shed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a lightweight civil engineering material of the present invention and a lightweight structure using the same will be described in more detail with reference to the drawings. FIG. 2 shows an embankment 20 (lightweight structure) using the lightweight civil engineering material 11 of the present invention. In the embankment 20, a plate-like ingot 12 reduced in volume by hot-melting and solidifying a foamed resin material made of the used recovered material shown in FIG. Lightweight civil engineering materials 11 are arranged side by side and each ingot 12 is integrated. The lightweight civil engineering materials 11 are stacked up to a predetermined height as shown on the left side of FIG. The embankment 20 is constructed by arranging the sandbags 14 and applying the covering 15 on the upper surface.

The embankment 20 on the right side of FIG. 2 is obtained by alternately stacking the lightweight civil engineering materials 11 shown in FIG.

(3) The lightweight civil engineering material 11 shown in FIG. 3 is a bag 18 in which the ingot reduced in volume by heat-melting and solidifying the foamed resin material composed of the used recovered material is crushed.
The lightweight civil engineering materials 11 are stacked up to a predetermined height as shown in the left side of FIG. 4, and the sandbags 14 for holding down the slopes are provided on the slopes.
And embankment 20 is constructed by applying covering 15 on the upper surface.

The embankment 20 on the right side of FIG. 4 is obtained by alternately stacking the lightweight civil engineering materials 11 shown in FIG.

FIG. 5 shows an example in which the lightweight civil engineering material 11 of the present invention is used as a backfill material for an embankment 30 (widening example) using a styrene foam block 31 (so-called EPS block). The embankment 30 shown in FIG. 5 is formed by stacking EPS blocks 31 on a foundation 32, a protection wall 33 is arranged on the front surface of the embankment 30, and a pavement 35 is formed on the upper surface via a concrete floor slab 34. I have. On the back surface of the embankment 30, crushed materials 17 obtained by crushing an ingot reduced in volume by thermally melting and solidifying a foamed resin material made of the used recovered material shown in FIG. The lightweight civil engineering materials 11 with which the 17 are integrated are piled up in the height direction of the embankment 30, so that the earth pressure applied to the embankment 30 is greatly reduced.

FIG. 6 shows an example in which the lightweight civil engineering material 11 of the present invention is used as a backfill material for a retaining wall 40. The lightweight civil engineering material 11 shown in FIG. 3 is used for the retaining wall 40. The lightweight civil engineering material 11 is stacked in the height direction of the retaining wall 40 as shown in FIG. Greatly reduces the earth pressure applied to

FIG. 7 shows a case in which the lightweight civil engineering material 11 shown in FIG.
In this embodiment, the layer made of the lightweight civil engineering material 11 functions as a drainage layer, and the infiltration water in the embankment 50 is filled with the embankment 50.
It becomes a drainage channel leading to the outside.

[0022]

According to the lightweight civil engineering material of the present invention, a plurality of heat-melted solidified products obtained by hot-melting a foamed resin material are stored in a bag, so that the handleability is good and the conventional earth and sand is excellent. Since the unit weight is extremely light as compared with civil engineering materials such as rocks and rocks, by applying this lightweight civil engineering material to a structure, the structure itself is also reduced in weight. For this reason, even if the load applied to the structure acts on the ground, phenomena such as “consolidation settlement”, “retraction settlement”, or “earth pressure generation” hardly occur.

Further, by applying this lightweight civil engineering material to a backfill material disposed on the backside of a structure such as an embankment or a retaining wall or a drainage material arranged in a layer in the structure, handling complexity is reduced. In addition, since the lightweight civil engineering material has an extremely light unit weight as compared with conventional civil engineering materials such as earth and sand and rocks, problems such as the subsidence of the ground supporting the structure and the occurrence of earth pressure on the structure hardly occur.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view showing a lightweight civil engineering material of the present invention in which a plurality of hot-melt solidified products are arranged vertically and horizontally in a mat-shaped bag and integrated.

FIG. 2 is a sectional view showing an embankment using the lightweight civil engineering material shown in FIG. 1;

FIG. 3 is an enlarged cross-sectional view showing a lightweight civil engineering material of the present invention in which a plurality of heat-melted solidified products are housed in a bag and integrated.

FIG. 4 is a sectional view showing an embankment using the lightweight civil engineering material shown in FIG. 3;

FIG. 5 is a cross-sectional view showing an example in which the lightweight civil engineering material shown in FIG. 3 is used as a backfill material for embankment (widening) using an EPS block.

FIG. 6 is a sectional view showing an example in which the lightweight civil engineering material shown in FIG. 3 is used as a backing material for a retaining wall.

FIG. 7 is a sectional view showing an example in which the lightweight civil engineering material shown in FIG. 3 is used as a drainage material for embankment.

FIG. 8 is a sectional view showing embankment using earth and sand which is a conventional civil engineering material.

FIG. 9 is a cross-sectional view showing an example in which crushed stone, which is a conventional civil engineering material, is used as a backfill material for a retaining wall.

Fig. 10 Embankment (widening) of crushed stone, which is a conventional civil engineering material
Sectional drawing which shows the example used as a backfill material.

[Explanation of symbols]

 11 ・ ・ ・ Lightweight civil engineering materials 12, 17 ・ ・ ・ Hot melt solidified material 13,18 ・ ・ ・ Back 20 ・ ・ ・ Filling 30 ・ ・ ・ Filling (widening) 40 ・ ・ ・ Retaining wall 50 ・ ・ ・ Filling

Claims (6)

[Claims] 1. A lightweight civil engineering material characterized in that a hot-melt solidified material obtained by hot-melting a foamed resin material is stored in a net-like bag or bag. 2. The lightweight civil engineering material according to claim 1, wherein the foamed resin material is a used recovered material such as a fish box, a tray, and a packing material for home electric appliances. 3. The lightweight civil engineering material according to claim 1, wherein the heat-melted solid is an ingot. 4. The lightweight civil engineering material according to claim 1, wherein the heat-melted solid is a crushed ingot. 5. The lightweight civil engineering material according to claim 1, wherein the bag is one of a water-permeable bag, a net and a basket. 6. A lightweight structure using the lightweight civil engineering material according to claim 1.