JPH0351426A - Lightweight banking structure - Google Patents

Abstract

PURPOSE:To improve stability and workability, and realize tree-planting on a slope-face by forming the blanking by laying of vegetation sandbags on the side of a banking body formed by laying up polystyrene foam bodies, and thereafter tensely laying network-reinforcing materials on the face or the slope. CONSTITUTION:A lowermost network-reinforcing material 5 is laid on a position situated on the undersurface of a closed conduit made up of a perforated pipe 7 in a banking body 2, and crushed stones 9, sand 10 are spread on the reinforcing material. After that, vegetation sandbags 3 are piled up in two steps, polystyrene foam body 1 is installed in one step behind the sandbags, and the space behind the polystyrene foam body is backfilled with refilling earth and sand. The process of piling up the vegetation sandbags, installing the polystyrene foam body, and backfilling is repeated in the same manner to form the banking body 2, and the tip of the lowermost network-reinforcing material 5 is pulled and wound up. Further, the network-reinforcing material is tensely laid on the slope-faces 4 to cover the surface of the slope,and the tip of the network- reinforcing material is fixed by an anchor 19 to be anchored to the ground, and then floor-concrete is placed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to the structure of a lightweight embankment formed by stacking polystyrene foam to form an embankment layer.

[Problem to be solved by the invention]

Conventionally, in order to reduce the weight of an embankment layer, efforts have been made to put into practical use a construction method in which polystyrene foam is piled up to form an embankment body. However, since the slopes are generally constructed of reinforced concrete retaining walls, it has not been possible to plan for greening.

This invention was made in view of the above circumstances. The purpose is to propose a lightweight embankment structure that has a lightweight embankment body, excellent stability, allows for greening of slopes, and is easy to construct without any problems during the embankment process.

[Means to solve the problem]

This lightweight embankment structure is as shown in Figure 1, and its gist is that polystyrene foam 1 is piled up to form the embankment body 2, and on the sides of the embankment, vegetation soil bags 3 are piled up to form the slope 4. It is characterized in that a net-like reinforcing material 5 fixed to the ground 6 is tension-laid on the surface 4.

〔Example〕

Hereinafter, an example of construction of the lightweight embankment structure according to the present invention shown in FIG. 1 will be described in detail.

In Fig. 4, before embanking is done along the slope of the earth 6, a stone is installed on the slope of the earth and on the underside of the embankment body 2 to prevent spring water from the earth 6 and water from entering the embankment body 2. hole tube 7
Bury it and install a culvert. The lowest net-like reinforcing material 5 was laid on the lower surface of the embankment body 2, and its base end was driven into the ground 6 to form an anchor 8 (φ25 mm, length 400 m+n).
It is fixed on the ground 6 with round steel). As the net-like reinforcing material 5, a net-like material called geogrid, which has high tensile strength and low elongation, is made by highly stretching polyolefin uniaxially or biaxially.

Vegetation soil bags 3 are piled up in two stages to a height of 400 nm at the side edge of the embankment main body 2 on the mesh reinforcement 5 laid in this way, that is, at the position where the slope 4 is to be formed, and crushed stones 9 are piled up on the back side.
The material was unrolled and rolled to a thickness of 350 mm, and 10 pieces of sand was placed on top of it.
Unwind it to a thickness of 50+n+n and level it.

Place the vegetation sandbags 3 in two tiers on the slope surface 4 on the horizontal sand bed 10, that is, on top of the vegetation sandbags 3 piled up earlier, at a height of 4.
00 111[D and stack up. At this time, as shown in FIG. 2, a safety net 12 with round bars 11, 11 inserted through both end edges is placed over the top, bottom and outside surfaces of the two-tiered vegetation sandbag 3.3. One layer of polystyrene foam 1 is stacked to a height of 400 mm on the back side of these two layers of vegetation soil bags 3, 3. Furthermore, the area behind the polystyrene foam 1 and between it and the ground 6 is backfilled with backfilling earthworks 3 to the same height. At the same time, round steel 11, 1 inserted through both ends of the safety net 12
1 with a nylon tape 14 and fixed with an anchor 15 (φ25 mm round @) driven into the backfill soil 13 (Fig. 2).

Again, on this embankment main body 2, vegetation sandbags 3 are covered with safety nets 12 in the same manner as described above, and piled up in two stages to a height of 400 mm, and on the back side, polystyrene foams 1 and 1 are piled up, and backfill soil 13 is placed. Backfill to form embankment body 2 with a height of 800 mm. At this point, roll up the net reinforcing material 5 that has been laid at the lowest level and have its base end fixed, and as shown in Figure 3, insert the joint pipe 16 through the middle part of the reinforcing material 5 at that height. It is pulled at 17 and fixed at an anchor 18 driven into the backfilling soil 13.

The process of stacking polystyrene foam 1 to form an embankment body 2 with a height of 800 mm, rolling up the mesh reinforcing material 5, passing it through a joint pipe 16, and fixing it with anchors 18 is repeated three times to form an embankment body 2 with a height of 2400+ nm. form 2. At this point, the tip of the net-like reinforcing material 5 is pulled to apply tension and laid on the slope, and its end is fixed to the ground 6 with an anchor 19.

In this state, the backfilling soil 13 is unrolled in layers and sufficiently compacted, and on top of that the reinforced concrete slab 20 (thickness 100 + n
+n). This floor slab concrete 20 is further reinforced by increasing the number of deformed steel rods 21 in the area covering the 3 portions of the vegetated sandbags.

Repeating the same process, pile up the vegetation sandbags 3 to form the slope 4, and pile up the boristyrene foam 1 to a height of 2 40.
A 0 mm embankment main body 2 is formed, the surface of its slope 4 is covered with a net-like reinforcing material 5 fixed to the ground 1, the material is laid under tension, and a concrete floor slab IJ-}20 is cast thereon.

A waterproof sheet 22 is laid on this slab concrete 20, and a 150 mm thick sand layer 23 is placed to prevent water from entering the embankment body 2 on which the bolystyrene foam 1 is piled up. In addition, a polystyrene foam l° is installed in the upper part where the thickness of the soil 24 exceeds 1,000 mm, the surface is covered with pressing concrete 25, and a drainage pipe 26 is installed on the bottom.
Piping.

Furthermore, an earth retaining structure 27 is provided at the top of the slope 4.

[For production]

This lightweight embankment structure has the above structure, and since the embankment body is formed by stacking polystyrene foam, it is lighter than when conventional soil is used, and the slope is stable, providing excellent stability. Because the slope is formed by piling up vegetated sandbags, it is more aesthetically pleasing than a retaining wall made of reinforced concrete.

The slope is tensioned with a net-like reinforcing material anchored to the ground, which prevents the slope from collapsing and poses no problems with stability. Furthermore, during construction, the steps of stacking polystyrene foam and stacking vegetation sandbags can be combined and construction can be carried out sequentially, so there is no need to keep any embankment on hand, improving work efficiency.

As in the example, it is preferable to secure the vegetated sandbags at intervals of about 400 mm in height using safety nets or the like, since this will reduce the sagging of the sandbags.

It is preferable to tension and lock the net-like reinforcing material at intervals of about 800+nn+ in height, as this creates good tension. Floor slab concrete height 2,000 m+n ~ 3,000 mm
It is preferable to provide the polystyrene foams at certain intervals, since this eliminates flapping when stacking the polystyrene foams.

In the above-mentioned embodiments, a polyolefin-based net-like reinforcing material is used, but the invention is not limited to this.

A mesh reinforcement material using high tensile strength fibers such as polyester or aromatic polyamide, or metal may also be used.

〔Effect of the invention〕

The present invention is as described above, and this lightweight embankment structure has excellent stability and aesthetics, and can also improve the efficiency of construction work.

[Brief explanation of drawings]

The drawings show the lightweight embankment structure of the example. Fig. 1 is an overall vertical cross-sectional view, Fig. 2 is a partial cross-sectional perspective view of the vegetation sandbags in a stacked and fixed state, and Fig. 3 is a mesh reinforcement structure. FIG. 7 is a partially cross-sectional perspective view of the intermediate portion in a fixed state; 1... Polystyrene foam, 2... Embankment body, 3... Vegetation sandbag, 4... Slope, 5... Net reinforcement Material, 6... Earth,
7... Perforated pipe, 8... Anchor, 9.
...Crushed stone, 10...Sand, 11...
... Round steel, 12 ... Safety net, 13 ...
・・Backfill soil, 14・・・・Nylon tape, 15・
... Anchor, 16 ... Joint pipe, 17 ... Line, l8 ... Anchor, 19
...Anchor, 20...Reinforced concrete floor slab, 21...Deformed steel bar, 22...
・Waterproof sheet, 23...Sand, 24...
・Additional soil, 25...Pressure concrete, 26.
...Drainage pipe, 27...Earth retaining work.

Claims (1)

[Claims] (1) Stack polystyrene foam to form the embankment body,
This lightweight embankment structure is characterized by forming a slope by stacking vegetated sandbags on the side of the slope, and on top of this slope, a net-like reinforcing material anchored to the ground is stretched and laid.