JPH09268561A - Vegetation base construction method - Google Patents

Abstract

(57) [Abstract] [Problem] Light weight, easy handling, safe operation, easy tracking of slopes with uneven surface, and stable cultivated soil while maintaining strength as a scaffold during construction. The present invention provides a method for constructing a vegetation base that can be physically restrained and that does not hinder the development of roots of plants. SOLUTION: A step of marking an intersection point 13 of a hexagonal lattice pattern 12 set on a base 11 of a work site, a step of standing a pillar 17 at a marking point 14, and a strip-shaped synthetic resin along the pattern 12 It comprises a step of forming the honeycomb-shaped three-dimensional structure 30 by attaching the net to the support while expanding the net 20, and a step of filling the sand surrounded by the net 20 with the earth and sand 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a vegetation base suitable for vegetation and planting of vegetation, particularly trees, in a vegetation restoration work on a slope.

[0002]

2. Description of the Related Art In recent years, vegetation restoration works have been emphasized not only for vegetation of grasses but also for vegetation and planting of trees. For vegetation and planting of trees, cultivated soil for rooting trees is required, and the depth thereof is generally 20.
cm or more is necessary.

As a method for fixing such a cultivated soil layer on a slope, for example, concrete beams are installed in a grid pattern on a base, and then each of the grid frames is filled with cultivated soil or sandbags containing cultivated soil. Many methods have been carried out, such as a method of arranging the metal porous circular rings adjacent to each other on the slope so that the rings circumscribe each other, and then filling the inside and outside of the rings with cultivated soil.

[0004]

However, in the case of a concrete beam, since the beam itself has a thickness, that is, a width,
When installed on the lower ground, not only is it easy to form a gap between the lower surface of the beam and the unevenness of the foundation, but it becomes difficult to fill the cultivated soil in the gap. When rainfall or seepage water is received with a void left just under the concrete beam, the cultivated soil in the frame surrounded by the concrete beam moves to the void and the total cultivated soil thickness decreases. In addition, the filling of the cultivated soil into the lattice frame sequentially shifts from the lower side to the upper side of the frame, but the upper side inevitably has a low packing density and the vegetation base thickness is insufficient. Furthermore, with this concrete beam, the roots of trees cannot be extended outside the beam.

On the other hand, in the case of a circular ring made of metal, since the ring itself is thin and porous, it is easy to fill the void between the ring and the unsettled ground with cultivated soil, but the adjacent rings are A small triangular area occurs between them. Since it is difficult for tools and workers' feet to enter the three-cornered area, compaction cannot be sufficiently performed, which is insufficient as a vegetation base.

Restraining the cultivated soil with concrete beams or a circular ring made of metal is advantageous in terms of stability of the cultivated soil, but is not suitable in that it prevents the spread of roots of vegetation and plantings.
In addition, since concrete beams and metal circular rings are heavy, they are not only difficult to handle, but they also pose a work risk. Further, the metal circular ring causes metal corrosion, which is not preferable for root growth.

The present invention has been made in view of the above problems, and its object is not only to be lightweight and easy to handle, to perform work safely, but also to easily follow a slope having unevenness, Moreover, it is to provide a method for constructing a vegetation base that can stably restrain cultivated soil while maintaining strength as a scaffold during construction, and that does not hinder root growth of vegetation.

[0008]

According to the present invention, a step of marking an intersection of a hexagonal lattice pattern set on the lower ground of a work site, a step of erected a pillar at the marking point, and a strip-shaped pattern along the pattern. A method for constructing a vegetation base comprising a step of forming a honeycomb-shaped three-dimensional structure by attaching the net to a pillar while expanding a synthetic resin net, and a step of filling earth and sand in a frame surrounded by the net. Is.

When the synthetic resin net is stretched along the pattern set on the base, the nets are arranged in multiple stages along the lower edge of the base, and the adjacent upper and lower nets are biased to each other. The double structure eliminates the narrow part where the tamping tool does not enter, which facilitates the work and increases the strength, which hinders the operation of workers when filling and tamping the soil. There will be no. In addition, the synthetic resin net can be easily fixed to the column by the connecting member.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIG. 1, the intersections 13 of the hexagonal lattice pattern 12 set on the grounded base 11 of the construction site are marked with a commercially available spray paint or the like to give marks 14.

As a method for positioning the mark, a hexagonal ruler 1 is prepared, and the hexagonal ruler 1 is provided with a slope 11 as shown in FIG.
Corners 2a, 2b, 2c, 2d, 2e, 2f
There is a method of marking with spray paint or the like at a position corresponding to, or a method of positioning with a rope. The size of each hexagonal lattice, that is, the length A in the longitudinal direction is 0.5 to 3.0 m, and the length B in the lateral direction is depending on the inclination angle of the foundation 11 and the depth of the embankment (cultivated soil). ,
0.5-2.0 m is preferable.

Next, as shown in FIG. 2, after making a hole 15 at the position of the mark 14 by using a boring drill (not shown),
The support 17 is inserted and fixed in the hole 15 using the mortar as the fixing material 16. The buried length of the pillar 17 is determined by the strength of the natural ground. As a method of erection of the columns, there is also a method of driving the columns 17 on the construction surface. Further, the projecting length of the pillar 17 projecting from the construction surface 11 is determined according to the depth of the embankment (cultivated soil), but is preferably 20 to 30 cm, for example.

Next, as shown in FIG. 3, after the end portion of the belt-shaped synthetic resin net 20a is fixed to the left end support 17a, the net 20a is moved along the imaginary line 12a of the first step of the setting pattern 12. While being stretched in a zigzag shape, it is temporarily fixed to the pillar 17a standing upright along the virtual line 12a.

Further, as shown in FIG. 4, after fixing the left end of the belt-shaped synthetic resin net 20b to the column 17b,
The net 20b is stretched in a zigzag shape along the second imaginary line 12b of the setting pattern 12 and temporarily fixed to a column 17b standing upright along the imaginary line 12b. Furthermore, the third and fourth steps of the pattern 12 are ...
The belt-shaped synthetic resin nets 20c, 20d, 20e, ... Are stretched in a zigzag shape along the virtual lines 12c, 12d ,. To construct.

After the honeycomb-shaped three-dimensional structure 30 is constructed, as shown in FIG. 6, the net 20 is fixed to the support column 17 by the spiral coupling member 40. The spiral coupling member 40 is
One or two nets 20 and columns 17 are attached so as to be sewn, and these members are integrally fixed. Then, after fastening by the connecting member 40, as shown in FIG. 7, the auxiliary rod 19 is inserted into the connecting member 40 on the side facing the support column 17, and the support rod 17 and the auxiliary rod 19 connect one or two nets. Hold 20 from both sides. The connecting member 40 is not limited to the spiral member, but may be any member such as a binding band made of synthetic resin as long as the net 20 and the support 17 can be connected.

As the spiral connecting member 40, for example,
Steel wire such as piano wire, polyethylene, polypropylene,
It is formed of a synthetic resin such as polyvinyl chloride or polystyrene, and its thickness is preferably 1 to 9 mm.

Similarly to the connecting member 40, the auxiliary rod 19 is also made of, for example, a steel wire such as a piano wire or a synthetic resin such as polyethylene, polypropylene, polyvinyl chloride or polystyrene, and has a thickness of 3 to. 6 mm is desirable. Further, the reinforcing bar is used for the column 17, and its thickness is 10 to 10.
22 mm is desirable.

Next, the cultivated soil 51 from the lower edge side 18 of the construction site
Are filled, and the soil is tapped, and the feet are tampered with to compact the vegetation base 50 as shown in FIG. To bring in the cultivated soil, bring it in by using a backhoe or a large sandbag bag filled with cultivated soil by a crane.

The synthetic resin net 20, for example, as shown in FIG. 9, is formed by extruding a thermoplastic synthetic resin, for example, high-density polyethylene, through the pores of the extruder and molding it.
Both are nets having a meridian 21 and a weft line 22 having a mesh size of 20 to 50 mm, preferably 20 to 30 mm, a width h of 20 to 30 cm, and a length of several meters to several tens of meters. A filament-shaped core material 23 made of wholly aromatic polyamide fiber (for example, Tenora manufactured by Teijin Ltd.) is embedded in the latitude line 22 for strength reinforcement. It is desirable that the strength at 5% extension is 4 t or more per 1 m width.

However, the present invention is not limited to this,
As a core material made of thermoplastic synthetic resin such as low density polyethylene, polypropylene, nylon, polyester or polyvinyl chloride, and high tension material such as ultra high molecular weight polyethylene fiber, carbon fiber, steel fiber, glass fiber or inorganic fiber It may be buried.

The thickness of the meridians 21 and the latitude lines 22 is preferably 3 to 15 mm, more preferably 3 to 10 mm. The thickness of the core material 23 is preferably 100 to 9
10,000 denier, more preferably 400-40,
000 denier.

Further, in the net 20, a thick sheet of polypropylene (PP) or high density polyethylene (HDPE) is perforated, and a geogrid in which a polymer is oriented by uniaxially or biaxially heating and stretching, PP or HDP with core wire
It is also possible to apply a polymer net formed by assembling E-shaped strands in a lattice shape and then heat-sealing the intersections thereof, or a mesh-shaped woven or knitted product fixed with a resin.

The shape of the stitches of the net 20 is not limited to a quadrangle, but may be a polygon such as a hexagon or an octagon. On the other hand, it is said that it takes about 3 years for rooting of trees, and after 3 years, when it is judged that the effect of hugging the foundation decreases and it is better not to interfere with root growth, biodegradation is considered. Materials may be used. As the biodegradable material, for the net 20, for example, acetate, polyhydroxybutyrate-valilate copolymer [Example; Biopol manufactured by Zeneca, UK], polylactic acid,
Polycaprolactone [eg; Daicel Chemical Co., Ltd., Praxel], aliphatic polyester [eg; Showa Highpolymer Co., Ltd.]
Manufactured by Bionore], polymer alloy of starch-polyvinyl alcohol [eg; Matterby manufactured by Novamont, Italy], starch + additive [eg manufactured by Chisso Co., N
OVON], starch 100% [eg, Amipol manufactured by Nippon Corn Starch Co., Ltd.] and the like. Examples of the biodegradable material include rayon, cotton, vinylon, aliphatic polyamide, and aliphatic polyester for the core material 23.

[0024]

As described above, according to the present invention, a step of marking an intersection point of a hexagonal lattice pattern set on a construction surface, a step of standing a pillar at a marking point, and a strip-shaped composite along the pattern are provided. It is composed of a step of forming a honeycomb-shaped three-dimensional structure by attaching the above-mentioned net to a support while expanding a resin net, and a step of filling a frame surrounded by the above-mentioned net with arable soil. Since the resin net is lighter in weight and easier to carry than conventional concrete beams and steel circular rings, it is possible to carry in and carry out safely and easily. Also, the actual slope surface is uneven, and the entire slope is curved, and there are wide and narrow places that are constant, but according to the present invention, it is possible to deal with it on-site construction. It is possible.

In the filling work of the cultivated soil, the worker needs a scaffold, but according to the hexagonal lattice method of the present invention, since the adjacent portions of the upper and lower nets are double tensioned,
It does not interfere with walking or working. The filling work of the cultivated soil is carried out by throwing in with a scoop or the like, first, smoothing it with a scoop, and then filling it with a foot habituation. Is easy to fill. Further, the upper side lower side of the upper part of the grid is a site where it is difficult to fill with earth and sand, but since the net used in the present invention has a square shape, the earth and sand thrown into the upper grid passes through the square shape and the grid The top and bottom of the upper part are also fully filled with earth and sand.

The substrate constructed according to the present invention is sufficient as a vegetation substrate. Further, when a biodegradable material is used as the material of the net, the reinforcing core material remains with the passage of years, but the resin portion is decomposed, so that it does not adversely affect the root growth of the tree. In addition, the synthetic resin net can be easily fixed to the column by the connecting member.

[Brief description of drawings]

FIG. 1 is a plan view of a hexagonal lattice pattern set on the lower ground of a construction site.

FIG. 2 is a plan view in which columns are erected at intersections of hexagonal lattice patterns.

FIG. 3 is a plan view when a net is attached along an imaginary line on a first stage of a hexagonal lattice pattern.

FIG. 4 is a plan view of a first stage of a hexagonal lattice pattern and a net attached along an imaginary line of the first stage.

FIG. 5 is a perspective view when a honeycomb-shaped three-dimensional structure is constructed on a base.

FIG. 6 is a perspective view showing a state in which two nets are fixed to a support using a spiral connecting member.

FIG. 7 is a perspective view showing a state in which two nets are fixed to a support using a spiral connecting member and an auxiliary rod.

FIG. 8 is a perspective view showing a state where a vegetation base is constructed by covering a honeycomb-shaped three-dimensional structure with earth and sand.

FIG. 9 is a plan view of a synthetic resin net.

[Explanation of symbols]

 11 Base 12 Hexagonal lattice pattern 13 Intersections 14 Marking points 17 Supports 20 Synthetic resin net 30 Honeycomb-shaped three-dimensional structure 51 Sediment

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Kato No.38, No. 38, Numeme, Harue-cho, Sakai-gun, Fukui Prefecture In front of Takosen Co., Ltd. (72) Inventor, Yoshikazu Inoue 2-3, Yamate, Kakogawa 5-101

Claims (3)

[Claims] 1. A step of marking an intersection point of a hexagonal lattice pattern set on the lower ground of a work site, a step of standing a pillar at a marking point, and a belt-shaped synthetic resin net being spread along the pattern. A method for constructing a vegetation base, comprising the steps of attaching the net to a pillar to form a honeycomb-shaped three-dimensional structure, and filling a frame surrounded by the net with earth and sand. 2. When the synthetic resin net is stretched along a pattern set on the lower ground of a work site, the nets are arranged in multiple stages along the lower edge of the base, and adjacent upper and lower nets are arranged. The method for constructing a vegetation base according to claim 1, wherein the leaning part is constructed in a double structure. 3. The method for constructing a vegetation base according to claim 1, wherein the synthetic resin net is fixed to the support by a connecting member.