JP2001164576A - Slope greening method and vegetation base body used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a greening method for a slope face and a vegetation base body used for the method capable of stably protecting the slope face for many years. SOLUTION: A turning body 2 is laid on the slope face 1 and a geotextilenet 3 is laid thereon, and the turfing body 2 and geotextile nets 3 are fixed by fixing members 4, 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for greening a slope of a levee on a hillside or a river, a slope formed with road construction or land development, and a vegetation substrate used for the method.

[0002]

2. Description of the Related Art One of the above-mentioned slope revegetation methods is a turf body in which a cotton wool is attached to one surface of a net and vegetation seeds are fixed to the surface of the cotton wool using a water-soluble glue. There is a simple construction method in which vegetative seeds are laid on the slope with the vegetation seeds approaching the slope. According to this method, the net can prevent erosion (erosion) due to rainfall, wind erosion, and the like, and vegetative seeds fixed to the upholstery can germinate and grow to protect the slope from greening within several years.

[0003]

However, the net in the above-mentioned upholstered turf has a strength of 50 to 3 per meter in width.
If it is weak as 00 kg and frost heaves occur in the construction in winter, falling sediment accumulates in the net and the belly comes out (bulges), and the anchor for fixing comes out and the net falls and the problem occurs. I have. Further, since the net strength is weak, the effect of suppressing small collapse cannot be expected so much.

[0004] On the other hand, in cold regions such as snowy countries, wire mesh is employed, but in this case, there is a concern that rust may reduce the effectiveness, and this is not always an effective measure.

The present invention has been made in consideration of the above-mentioned matters, and an object of the present invention is to provide a slope revegetation method capable of stably protecting a slope for a long period of time and a vegetation substrate used for the method. is there.

[0006]

Means for Solving the Problems In order to achieve the above object, the slope greening method according to the present invention comprises laying a turf on a slope and laying a geotextile net on an upper surface thereof.
The upholstery body and the geotextile net are fixed using a fixing member (claim 1).

The geotextile net is made of a synthetic polymer material such as polyethylene or polyester and has a strength of about 1 t / m to 8 t / m and a weight of 200 g / m ^{2 to} 300 g / m ^2. And
It has such characteristics that it is tough despite its light weight. Therefore, according to the above-mentioned slope greening method, even if frost heaves occur in the construction in winter, falling sediment does not accumulate in the net and the belly comes out, or the fixing member comes out and the net falls. In addition to this, the small collapse can be reliably suppressed, and the slope can be stably protected for a long time.

When the slope greening method is applied, a net having a water-retaining property and a light-shielding property may be laid on the top surface of the geotextile net (claim 2). Deterioration due to light such as light can be suppressed, and stable protection of the slope by the geotextile net can be maintained for a long time.

Further, a geotextile net may be laid on the slope, and a vegetation material containing vegetation seeds and a fertilizer base material may be sprayed from above (claim 3).

Further, the vegetation substrate used in the slope greening method of the present invention comprises a stretched turf body laid on the slope and a geotextile net laid on the upper surface of the stretched turf body (claim 4).

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention.
First, in FIG. 1, reference numeral 1 denotes a slope to be constructed; 2, a turf body laid on the slope 1; 3, a geotextile net laid on the upper surface of the turf body 2; , 5 are fixing members, and 6 is a pressure receiving plate.

As shown in FIG. 2, the upholstered turf body 2 has a net 7 having flexibility and appropriate strength.
And a vegetative seed 9 adhered to the entire surface of the soluble material 8 using a water-soluble paste so as to be uniform over the entire surface of the soluble material 8. It is configured.

The net 7 is made of a warp and a weft, and is woven into a predetermined shape by a Russell loom using monofilaments made of, for example, polynosic rayon, and accommodates the fertilizer bag 10 in the weft direction at an appropriate interval. A bag accommodation section 11 is formed. The fertilizer bag 10 accommodates a fertilizer base material 12 such as an appropriate fertilizer, a water retention agent, and a soil conditioner, which is directly or indirectly required for plant growth.

The soluble material 8 is used to germinate vegetative seeds 9.
Examples include soft cotton, soft nonwoven, pulp nonwoven, and soluble paper that do not hinder growth. Further, as the water-soluble paste, there is polyvinyl alcohol (PVA).

As the vegetation seeds 9, pasture seeds, wild grass seeds, and flower seeds may be used alone, or they may be used in a suitable mixture.

The geotextile net 3 is made of, for example, a synthetic polymer material such as polyethylene or polyester, and has a strength of about 1 t / m to 8 t / m and a weight of 200 g / m ^{2 to} 300 g / m ^2. It is preferable that the size is 15 mm to 30 mm, for example. As shown in FIG. 3, the geotextile net 3 has a band portion having a width of about 10 cm formed by densely knitting a material constituting the net portion 13 at both ends parallel to the longitudinal direction L of the net portion 13. 14 are formed vertically. Further, holes are formed in the band portion 14 at appropriate intervals.

As the fixing members 4 and 5, for example, self-piercing anchors or anchors for reinforcing bar insertion are used, and the anchor denoted by reference numeral 4 has a length of about 1.5 to 3 m. The pressure receiving plate 6 has, for example, one side of 20 to
It is made of a 30 cm square iron plate, and a hole for inserting the anchor 5 is formed in the center thereof.

Next, a slope greening method in this embodiment will be described. First, after appropriately shaping the slope 1,
The turf body 2 is laid on the slope 1 such that the net 7 is on the upper side and the soluble material 8 provided with the vegetation seeds 9 is on the lower side (the slope 1 side). In this case, the fertilizer bag 10 may be stored in the bag storage portion 11 of the upholstery body 2 in advance, but the fertilizer bag 10 may be stored in the bag storage portion 11 at the construction site.

Next, as shown in FIG. 3, a geotextile net 3 is placed on the upper surface of the
Is laid in parallel with the height direction. As shown in the figure, the geotextile net 3 is in a state of being rolled up, and may be laid from above the slope 1 so as to be unwound. In this case, the geotextile net 3 is laid such that the belt portions 14 of the adjacent geotextile nets 3 overlap each other as shown in FIG. 3 so as to cover the upper surface of the upholstery body 2 and adhere to the slope 1. I do. Then, after the anchor 5 is driven into the hole portion of the band portion 14 and the pressure receiving plate 6 is placed, the geotextile net 3 is fixed by anchoring the head of the anchor 5 with a screw or the like. In addition, Geotextile Net 3
For fixing at the uppermost part of the slope 1, after appropriately shaving the corresponding slope 1, the anchor 4 is driven and then buried, or the upper slope or the top of the slope 1 is wound, The anchor 4 is cast and fixed.

If the surface of the slope 1 has large irregularities, an auxiliary anchor having a diameter of 9 mm and a length of 160 mm is cast at an appropriate place, and the geotextile net 3 is brought into close contact with the slope 1 with the auxiliary anchor. You may.

By fixing the geotextile net 3 to the slope 1, the upholstery body 2 is also fixed to the slope 1.

As described above, in the slope greening method according to the present invention, the upholstery turf 2 having the fertilizer bag 10 attached thereto is laid on the slope 1, and the geotextile net 3 is laid on the upper surface thereof. The construction is very simple because only the geotextile net is fixed. In particular, the combination of the upholstered turf body 2 and the geotextile net 3 enables a lightweight and simple method of construction without using concrete.

Even if frost heaves or the like occur during the construction in winter, falling earth and sand will not accumulate in the net and the belly will not appear, and the anchors 4 and 5 will not come off and the net will not fall. In addition, the combination of the geotextile net 3 and the anchors 4 and 5 can surely prevent local small collapse and rock fall, and can stably protect the slope for a long period of time.

The vegetation seeds 9 attached to the upholstery body 2
When germinated and grown, the roots and stems are entangled with the tough geotextile net 3 so that the plant is stably elongated, and the protection of the slope 1 is more firmly protected by the geotextile net 3 and the roots of the plant. Protected. Therefore, erosion or the like does not occur.

When the geotextile net 3 is fixed by the anchor 4, the pressure receiving plate 6 is provided.
The base at the anchor placing portion of the slope 1 becomes strong.

The slope 1 on which the slope greening method of the present invention is constructed is not necessarily rich in moisture and nutrients. Rather, the growth environment of plants such as hard soil and soft rocky land is limited. Often poor. In such a case,
4 and 5 may be used. In other words, these figures show a second embodiment of the present invention. In this embodiment, a geotextile net 3 laid on the upper surface of the upholstery body 2 laid on the slope 1 is shown.
A net 15 having water retention and light shielding properties is laid on the upper surface of the. The net 15 is, for example, a coconut fiber net.

The coconut fiber net 15 is used as follows. That is, after the upholstery body 2 is laid on the slope 1 and the geotextile net 3 is laid on the upper surface thereof, the upholstery body 2 and the geotextile net 3 are fixed by the anchors 4 and 5, and then the palm fiber net 15 is placed on the upper surface of the geotextile net 3. And is fixed by an appropriate fixing member 16 as shown in FIG.

The slope greening method according to the second embodiment has the following effects in addition to the functions and effects of the first embodiment. That is, since the palm fiber net 15 has water retention and light-shielding properties, by coating the palm fiber net 15 from the top surface of the geotextile net 3, drying of the plants grown on the upholstered turf 2 and evaporation of moisture are effectively prevented. The deterioration of the geotextile net 3 due to light such as sunlight is effectively prevented. Therefore, stable protection of the slope 1 by the geotextile net 3 is maintained for a long time.

The slope revegetation method according to the second embodiment is not intended only for the slope 1 where the plant growth environment is poor. However, it goes without saying that it may be applied to a relatively good slope 1.

In each of the above embodiments, when the geotextile net 3 is laid, the band 14 is made parallel to the height direction of the slope 1. However, the present invention is not limited to this. As shown in FIG. 6, the band portion 14 may be arranged so as to be in a direction orthogonal to the height direction of the slope 1 (parallel to the contour line direction).

FIG. 7 shows the geotextile net 3.
As shown in FIG. 7, the strips 14A may be provided at appropriate intervals not only on both sides parallel to the length direction but also parallel to the width direction.

The upholstery body 2 in the above-described embodiment includes:
Although the bag accommodating portion 11 for accommodating the fertilizer bag 10 is formed, and the upholstery body 2 provided with the fertilizer bag 10 is laid on the slope, it is not always necessary to attach the fertilizer bag 10 to the upholstery body 2. When the vegetation seeds 9 are attached to the soluble material 8, an appropriate fertilizer, water retention material, or the like may be used.

In the above embodiment, the upholstery body 2 and the geotextile net 3 are combined, but the embodiment shown in FIG. 8 may be used. That is, in this embodiment, the turf body 2 is not laid on the slope 1, but the geotextile net 3 is laid so as to be in close contact with the slope 1, and a vegetation material containing vegetation seeds and a fertilizer base material from above. 17 is sprayed by a nozzle 18 to form a spray layer 19 on the slope 1. That is, in this embodiment, the geotextile net 3 is combined with the thick layer soil spraying method, and the slope 1 is protected and reinforced by the geotextile net 3.

[0034]

The present invention is embodied in the above-described embodiment and has the following effects. In other words, according to the first aspect of the present invention, a combination of the upholstered turf and the geotextile net enables a light-weight simple method without using concrete. Even if frost heaves or the like occur in the construction in winter, falling earth and sand will not accumulate in the net and the belly will not appear, and the fixing member such as an anchor will not fall out and the net will fall. In addition, the combination of the geotextile net and the anchor can reliably prevent local small collapse and rock fall, and can stably protect the slope for a long period of time.

When the vegetation seeds attached to the turf germinate and germinate, their roots and stems become entangled with the tough geotextile net, so that the plant can stably elongate and the slope can be protected. And more protected by plant roots. Therefore,
Erosion does not occur.

According to the slope greening method of the second aspect, a net having water retention and light shielding properties is provided on the top surface of the geotextile net, so that the effect of the first aspect of the present invention is provided. As a result, drying and water evaporation of the plants grown on the turf are effectively prevented,
The effect of effectively preventing the geotextile net from being deteriorated by light such as sunlight is exhibited.

Further, according to the third aspect of the present invention,
The slope greening method can be implemented without using upholstery.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a slope greening method according to a first embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing a main part of the method.

FIG. 3 is an enlarged perspective view showing a main part of the method.

FIG. 4 is an exploded perspective view showing a slope greening method according to a second embodiment of the present invention.

FIG. 5 is an enlarged longitudinal sectional view showing a main part of the method.

FIG. 6 is a perspective view showing another embodiment of laying a geotextile net on a slope.

FIG. 7 is a perspective view showing another embodiment of the geotextile net.

FIG. 8 is a longitudinal sectional view showing a slope greening method according to a third embodiment of the present invention.

[Explanation of symbols]

1 ... Slope 2 ... Changing body 3 ... Geotextile net,
4, 5: fixing member, 10: fertilizer bag, 11: bag storage part, 1
5: Net having water retention and light shielding properties; 17: Vegetation material.

Claims (4)

[Claims] 1. A slope revegetation method comprising: laying a turf on a slope, laying a geotextile net on an upper surface thereof, and fixing the turf and the geotextile net using a fixing member. 2. A turf body is laid on a slope, and a geotextile net is laid on an upper surface thereof. Then, the turf body and the geotextile net are fixed using a fixing member, and further, water retention and light shielding are performed on an upper surface of the geotextile net. A slope revegetation method characterized by laying a net with a characteristic. 3. A slope greening method comprising laying a geotextile net on a slope and spraying a vegetation material containing vegetation seeds and a fertilizer base material from above. 4. A vegetation substrate used for a slope greening method comprising a stretched turf body laid on a slope and a geotextile net laid on an upper surface of the stretched turf body.