JPH02229317A - Lightweight civil engineering method - Google Patents

Abstract

PURPOSE:To reduce generation of gaps, facilitate work, and stabilize foaming bodies against the seepage of underground water, by forming columnar foaming bodies made from foaming resin, contacting the circumferential faces mutually, and horizontally arranging the upper faces of them to form a base surface. CONSTITUTION:Many columnar foaming bodies 1 having circular section coexist on the required upper face 2 to be banked of a soft ground 4, contacting the circumferential faces mutually, communicated spaces due to respective circumfer ential faces are formed, and a plurality of steps are piled. Next, a plate-like body 3 made from the same foaming body is mounted extending over the upper surface of the piled columnar foaming bodies 1, and construction required for a base surface is performed. The soft ground 4 is drilled, a recessed ground 5 is formed, permeable sandy soil 6 is laid, many columnar bodies 1 coexist on this, after several steps are piled, on the outer circumference of the recessed ground 5 and the group of foaming bodies 1, gravel, crushed stones, and the like 7 are filled. Hereafter, the side and upper face of the banking are fixed with concrete 8 or the like, and the upper face is paved with asphalt 9 or the like.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is applicable to the construction of lightweight elliptical structures, etc. on hollow or flat ground made of soft ground, etc., and the construction of roads, etc. by embanking on sloped surfaces. This article concerns a lightweight civil engineering method that is suitable for use when (Conventional technology and its issues) Conventional civil engineering methods have been used when embanking on soft ground, embanking on steep slopes, backfilling structures, or widening developed areas, etc., by excavating the topsoil as necessary. A known method is to simply lay gravel, concrete, etc. and use this as the foundation surface. However, this method increases the load and soil pressure, and if the application site is on soft ground,
Subsidence occurs, and if the site is on a steep slope, there are drawbacks such as slippage and subsidence. The so-called EPS construction method, which uses large styrofoam blocks in the form of rectangular parallelepipeds and thick plates stacked on top of each other, has been developed and has recently been applied to bypasses in Japan.

However, since these styrofoam blocks have a fixed shape of a rectangular plane, there are many spaces between the stacked blocks and between the six excavation surfaces.
Additionally, since these blocks are generally impermeable, permeation water such as rainwater flows around the bottom surface of the stacked blocks, loosening the mutual stacking, and this makes it easy for the blocks to move individually due to groundwater gushing out. ．． (Means for Solving the Problem) In contrast, the present invention forms the above-mentioned block with a cylindrical foam body made of foamed resin and having a nearly circular cross-sectional outline, and these cylindrical foam bodies are arranged so that their peripheral surfaces touch each other. By aligning the blocks so that their top surfaces are almost horizontal and stacking them in multiple tiers, and using the surface that connects the top surfaces as the foundation surface, the space created by the unique shape of the blocks is reduced, making work easier. At the same time, the structure is such that it can be stably maintained even if underground water gushes out. (Embodiment of the Invention) An embodiment of the invention will be described based on the drawings. As shown in FIG.
A large number of ... are placed on the required upper surface 2 of the soft ground to be embanked.
They are usually stacked in multiple tiers by standing side by side with their circumferential surfaces butting each other and forming a communicating space between each surface. Next, a plate-like body 3 made of the same foam is placed over the top surface of each stacked cylindrical foam body 1, and the required construction is carried out using this as a base surface. In this case, each cylindrical foam 1
. . . may be arranged in either a base pattern as shown in FIG. 2 (A) or a staggered pattern as shown in FIG. 2 (B) when viewed from the top. These cylindrical foams 1 are made of a suitable synthetic resin such as polystyrene. AS resin, ABS resin, polyethylene of various densities, polypropylene, propylene-ethylene random copolymer, propylene-ethylene block copolymer, propylene-ethylene-butene-1 random copolymer, acrylonitrile-styrene copolymer, chloride Using hard and/or semi-rigid foamed resins based on synthetic resins such as vinylidene, nylon 6, nylon 66, nylon 610, metaxylylene adipamide, polyethylene terephthalate, polybutylene terephthalate, etc., (
It is made by a one-piece solid body as shown in A), a cylindrical body with a small hole as shown in Fig. 3 (B), or a series of band-shaped plates rolled up into a roll as shown in Fig. 3 (C). Usually, in either case, a material with an average compression hardness of 0.8 kg/cJ or more on the cross section is used. Figure 4 is a sectional view showing an example of a road made of lightweight embankment constructed using the civil engineering method of the present invention. In order to obtain a road as shown in Figure 4, first, the soft ground 4 is excavated to form a depression 5. Next, a sandy soil 6 with good water permeability is spread in the depression, and a large number of the cylindrical foams 1 are placed on top of it, and after stacking them in multiple stages, the inner peripheral surface of the depression 5 and the cylindrical foams are stacked. l...Fill gravel, crushed stones, etc. 7 between the group outer periphery and compact it. After completing the embankment using the cylindrical foam 1..., a plate-like foam body is placed on top of the embankment as necessary, and the side and top surfaces of this embankment are then hardened with concrete 8 or the like (fixed with cement), and then the top surface is Pave with asphalt 9 grade and complete the work. Moreover, FIG. 5 is a sectional view showing an example of a road constructed on a slope by the civil engineering method of the present invention. To construct such a road, first, a retaining wall made of concrete 8 or the like is fixed upright or on a slope at a location corresponding to the width of the road below the sloped ground 4'. After that, the inside of the space consisting of mu and the ground is constructed in the same manner as above, and then paved. The above is an example of building a road on the ground, but the construction method of the present invention can also be used for backfilling structures, widening reclaimed land, etc. Furthermore, the construction method of the present invention can be suitably used when constructing golf courses (especially greens). In this case, unlike the above example, earth embankment will be carried out without cement fixation. In addition, although the columnar foam 1 has been described above and has a circular cross-sectional shape, this is not limited to a circle, and may be an ellipse or a polygon. No problem. (Effects of the Invention) This invention has the above-mentioned structure, and is a method for embanking or soil consolidation on the foundation surface of an elliptical structure by stacking a large number of columnar foams l... having a constant lightweight shape. Even if the ground is soft, there is no risk of compressing and deforming the ground 4, and each of these columnar foams 1 has a columnar structure that can withstand loads in the vertical direction. Since they are erected side by side, there is no risk of movement in the lateral direction, and infiltrated water flows freely down along the outer circumferential surface of each columnar foam, so the columnar foam 1... is entirely underground. It is maintained stably and there is extremely little movement by groundwater or occurrence of landslides. In addition, the construction method is columnar foam l.
. . . may be filled sequentially in an upright state so that it falls within the required range in the construction ground, and the gravel, filling, etc. between the outer periphery of the columnar foam group set upright and the inner periphery of the excavated ground. The work is simple and requires little effort. In addition, in this case. When the roll-shaped columnar foam 1 shown in FIG. It is convenient for filling because the outer diameter can be adjusted arbitrarily by cutting the length.

[Brief explanation of the drawing]

The drawings show an example of the state in which the method of the present invention is implemented, and FIG. 1 is a perspective view of columnar foams stacked up, and FIG. 2 (
A) (B) are views of stacked columnar foams viewed from above, Figures 3 (A), (B), and (C) are perspective views showing examples of columnar foams, and Figures 4 and 5 are These are explanatory diagrams of road construction on flat land and embankment work on sloped land, respectively. 1... Columnar foam, 3... Plate-shaped body, 4... Soft ground, 4'... Sloped ground, 5... Depression, 6... Sandy soil, 7... Gravel , crushed stone, 8... concrete, 9
···asphalt. Patent applicant: JSP Co., Ltd. Figure 1] Figure 3 Figure 2 (A) Section 5 b Figure 2 (B)

Claims (2)

[Claims] (1) A lightweight civil engineering method in which a large number of columnar foams are laid down with their circumferential surfaces abutting each other on the ground that has been excavated as necessary, and the required construction is carried out using the top surface as the foundation surface. . A lightweight civil engineering method, characterized in that the foams are arranged so that their vertical direction substantially coincides with the direction of gravity, and so that adjacent foams have a desired space between each other. (2) The lightweight civil engineering method according to claim 1, wherein the foam is formed into a cylinder having a desired diameter by winding a series of strip plates in advance in a roll.