JPH0699933B2 - Slope prevention layer greening method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a greening method for a slope failure prevention layer.

[0002]

2. Description of the Related Art When a road is constructed by cutting mountains or embankment, leaving one or both sides of the road as bare ground may cause collapse. In order to prevent such collapse, conventionally known is a method of spraying mortar or concrete onto the slope to form a slope collapse prevention layer on the slope.

[0003]

It is suitable to form the above-mentioned collapse prevention layer for stabilizing the slope, but the skin of the layer does not harmonize with the surrounding environment and causes damage to the scenery. ing.

An object of the present invention is to provide a greening method for a slope prevention layer, which can cover the surface of the collapse prevention layer with plants and can be harmonized with the surrounding environment.

[0005]

In order to achieve the above-mentioned object, a method for greening a slope collapse prevention layer according to the present invention is characterized in that a collapse prevention layer formed on a slope surface by spraying mortar or concrete A process of completely opening a large number of through holes reaching the ground below, a process of sticking a net on the collapse prevention layer after drilling, and mixing plant seeds in each through hole and the surface of the net collapse prevention layer And a step of spraying the formed soil to form a soil layer.

The slope failure prevention layer which is the target of the greening method is
It may be an existing one or a new one. In addition, it is better to scrape off existing parts that are aging and have many cracks.

The through hole formed in the collapse prevention layer has a diameter of 4 mm.
It is preferable that the holes are 0 to 70 mm and scattered at 4 to 10 points / m ² . Since the amount of groundwater and surface water is smaller in the higher slopes than in the lower slopes, in order to equalize the groundwater supply through the throughholes to the entire soil layer, the diameter of the throughholes should be changed. It is desirable that the former be larger than the latter or that the number per 1 m ² be larger than the latter. A rock drill is used for drilling. In addition, it is preferable to put a fertilizer and a water retaining material in the through holes before spraying the soil with soil in order to promote the growth of plants.

A thick net is suitable for spraying the soil thickly, but a lath can also be used. The net is fixed to the collapse prevention layer by an appropriate means using an anchor or the like. For example, as shown in Japanese Patent Publication No. 64-542, a plurality of vertical ropes and a plurality of vertical ropes are formed on the surface of the collapse prevention layer. It may be fixed by passing with the horizontal ropes of the above, and the nets may be stretched over these ropes to connect them to the ropes. Then, a plurality of vertical ropes may be passed and the ropes may be fixed to the collapse prevention layer to press the net, and then the net may be connected to the rope. Further, in order to ensure the position of the sprayed soil, a flexible soil-holding member extending laterally at a predetermined interval in the longitudinal direction is provided between the collapse prevention layer and the soil layer. It is desirable to interpose a plurality. In the lateral direction, the plurality of soil-holding members are arranged in a substantially straight line, but it does not matter if the adjacent members are displaced from each other. As the soil-holding member, a brush-shaped member having a predetermined length, in which a stranded metal wire is used as a core, and synthetic resin fibers colored green from the core are radially extended, is suitable.

[0009] soil dressing is the use the same ones used in conventional vegetation Engineering the seeds of plants to be mixed in, for example, Kentucky 31 Fuesuku, Kentucky Blue G, orchardgrass, creeping red Hue disk, prospect The seeds such as flowers and flowers of wormwood can be raised. It is also desirable to mix compost with the soil. The thickness of the soil layer should be approximately the same as the surface of the net so that it does not flow out due to rainwater.
Spray the surface of the net slightly to cover the surface.

[0010]

The function of revegetation for the slope failure prevention layer according to the present invention is as follows.
In the collapse prevention layer formed on the slope by spraying mortar or concrete, a large number of through holes reaching the ground below are completely opened, and nets are attached on the collapse prevention layer after drilling, Since the soil containing the seeds of plants is sprayed onto the inside of the through hole and the surface of the net collapse prevention layer to form the soil layer, part of the soil layer has entered many through holes on its back surface. In addition, the presence of the net tied to the collapse prevention layer in the state of being embedded in the soil layer allows the soil layer to settle on the surface of the collapse prevention layer.

[0011] By supplying groundwater to the soil layer from the ground behind the collapse prevention layer through a large number of through holes, the seeds of the plant mixed in the soil will germinate smoothly, and the ground through each through hole. Root in the mountains.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows a state in which a mountain (1) is cut and a road (1) is provided, and the cut slope (2) is sprayed with mortar to form a collapse prevention layer (3) already formed. Show.

First, as shown in FIG. 2, the thickness is about 70 mm.
The existing collapse prevention layer (3) has a large number of circular through holes (4A) (4B)
1 using a rock drill (not shown) so that
Open 4 per m ² . At this time, the through hole (4
The diameter of A) is 70 mm, and the through holes (4B) below these are
The diameter was 50 mm.

Next, as shown in FIG. 3, a plurality of vertical ropes (5) and a plurality of horizontal ropes (6) are passed over and fixed to the surface of the collapsing prevention layer (3) after drilling. This time, the vertical rope
(5) The space between the ropes is narrow, and the space between the horizontal ropes (6) is wide.

Next, as shown in FIG. 4, a plurality of horizontally long brush-like horizontal soil holding members (7) each having a metallic twisted wire as a core and synthetic resin fibers colored in green extending radially from the core are adjacent to each other. After arranging the ropes (5) at a predetermined interval in the vertical direction and fixing both ends of each soil holding member (7) to the adjacent ropes (5), the thick net (8) is placed over the rope. Cover and connect to the vertical and horizontal ropes (5) and (6) and secure them on the collapse prevention layer (3).

Finally, as shown in FIG. 5, each through hole (4A)
The soil containing the seeds of plants is sprayed with a spraying machine (not shown) on the inside of (4B) and on the surface of the net collapse prevention layer (3) to form the soil layer.
Form (9).

[0018] Kentucky 31 Fuesuku as a seed of the plant, creeping red Hue disk, Kentucky blue G, Medohagi, was using the mugwort, germinate in about three weeks, the plant (10) after 3 months to completely grow, As shown in FIGS. 6 to 8, the slope collapse prevention layer (3) could be greened. Groundwater from this mine (11) is supplied to the soil layer (9) through the through holes (4A) (4B) and the roots (10a) of the plants (10).
It was confirmed that the mountain was stretched over the natural ground (11).

FIG. 9 shows a modification of the distribution of through holes.
The diameter of the upper through hole (4A) in FIG.
Instead of making it larger, the number of upper through-holes (4C) per m ² is set to 9 and is larger than the number of lower through-holes (4B) per 1 m ² .

[0020]

EFFECTS OF THE INVENTION According to the greening method for slope slope prevention layer of the present invention, a part of the soil layer enters into a large number of through holes on the back surface thereof, and the net fixed to the slope prevention layer is used. Since the soil is embedded in the soil layer, the soil layer is fixed on the collapse prevention layer surface, so that the soil layer can be kept stable even on slopes with a large slope.

In addition, groundwater is supplied to the customer soil layer from the ground behind the collapse prevention layer through a large number of through holes,
Since seeds of plants mixed in the soil germinate smoothly and roots in the ground through each through hole, the surface of the collapse prevention layer is covered with the plants of the soil that grow without being different from the ground plants. Can be in harmony with the environment. In particular, there is an advantage that the collapse prevention layer can be hidden if it already exists and cracks are generated.

[Brief description of drawings]

FIG. 1 is a perspective cross-sectional view of a slope with a collapse prevention layer formed thereon.

FIG. 2 is a perspective sectional view of a slope showing a state in which a large number of through holes are formed in the collapse prevention layer.

FIG. 3 is a perspective cross-sectional view of a slope showing a state in which vertical and horizontal ropes are passed and fixed on the surface of the collapse prevention layer after drilling.

FIG. 4 is a perspective cross-sectional view of a slope showing a state in which a net is attached to a collapse prevention layer after fixing a rope via a horizontal oblong soil retaining member.

FIG. 5 is a perspective cross-sectional view of a slope in a state in which a soil containing a plant seed is sprayed to form a soil layer in each through hole and on the surface of the net collapse prevention layer.

FIG. 6 is a front perspective sectional view showing a state after the fall prevention layer has been greened.

FIG. 7 is a partially enlarged perspective sectional view of the slope shown in FIG. 6 which is sequentially cut out until the surface of the collapse prevention layer is exposed.

FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a perspective cross-sectional view corresponding to FIG. 2 showing a modified distribution of through holes.

[Explanation of symbols]

 (2): Slope (3): Fall prevention layer (4A) (4B) (4C): Through hole (8): Net (9): Soil layer

Claims (1)

[Claims] 1. A step of completely forming a large number of through holes reaching the ground below the collapse prevention layer formed on the slope by spraying mortar or concrete, and on the collapse prevention layer after drilling. A slope collapse prevention layer characterized by including a step of attaching a net to each of the through holes and a step of forming a soil layer by spraying a soil containing plant seeds in each through hole and on the surface of the net collapse prevention layer. Greening method.