JPH1072830A - Protection work of slope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excecute earth-retaining work and greening work at the same time, by containing vegetation bags in which seeds of trees are wrapped inside, in the inside of a netted member and laying earth-retaining members obtained in such a way on a slope. SOLUTION: A netted member 2 has square meshes and openings at both ends to contain vegetation bags 3. The vegetation bag 3 is hermetically sealed and necessary materials for vegetation like seeds of trees, quick-acting and slow-acting fertilizer, water-retaining agent, etc., are enclosed inside. These vegetation bags 3 are contained in the netted member 2 and integrally formed as an earth-retaining member 1. And these are arranged respectively in both directions along the inclination of the slope N and crossing at right angles against the direction and arranged to form a lattice as a whole. In this case, anchors 4 are positioned to pierce the meshes of the netted member 2 and fixed to the slope N so as to bridge respective earth-retaining members 1 and mutual connection parts. After execution, vegetation bags 5 for plants containing plant seeds are contained in the areas surrounded by respective earth-retaining members 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slope protection method.

[0002]

2. Description of the Related Art If a slope is left in a cut state, surface soil may run off. Various methods have been employed to protect the soil. For example, a construction method using a knitting fence is one of them. This construction method is a construction method in which scabs and the like are arranged along the width direction of the slope, and a plurality of fixed lobes are fixed at an appropriate pitch along the slope of the slope.

[0003] In addition, a construction method called framing is also known. The framing method is to assemble a concrete frame (slope frame) with an eye of about 1m2 on the slope, to place soil in each eye and to set up vegetation sandbags. The fastening is performed.

[0004]

However, the above-mentioned knitting and fencing works and framing works are intended only for retaining the soil so that the stubble or concrete frame functions as a weir against the runoff of the surface soil. In order to do this, it is necessary to separately perform greening work. Further, there is also a problem that even if a fixing tool such as an anchor is driven in and a sufficient fixing function is initially provided, if the ground becomes loose, the anchor effect is not sufficiently exerted in the long term.

[0005] A construction method using a greening net is also known,
In this method, seeds and fertilizers are sprayed onto a net laid so as to cover the slope, and the topsoil is stabilized by the roots of germinated herbs. The net is sprayed until vegetation is completed. It only exerts a function of preventing runoff of seeds and the like, but does not exert a sufficient function of preventing runoff of surface soil.

The present invention has been devised in view of the above-mentioned conventional problems, and an object of the present invention is to provide a slope protection method capable of simultaneously performing earth retaining and greening. It is.

[0007]

According to a first aspect of the present invention, there is provided a vegetation bag containing woody seeds and the like, wherein a mesh that can pass through the roots of the woody seeds is provided. It is characterized in that earthing is carried out by being accommodated in a holding net-shaped member and fixing the earth retaining member thus obtained along the slope.

According to a second aspect of the present invention, in the first aspect, the area surrounded by the earth retaining member is:
It is characterized by being a herbaceous vegetation area.

[0009]

According to the first aspect of the present invention, when the earth retaining member is constructed on the slope, the earth retaining member functions as a weir for the surface soil, and the tree germinated from the vegetation bag accommodated in the net-shaped member. The wood forms vegetation along the earth retaining member.

Therefore, according to the first aspect of the present invention, the earth retaining member simultaneously achieves the earth retaining function and the greening function.

When an anchor is driven in at the time of construction, a sufficient fixing function is exhibited at the beginning of the construction, but the anchor function may decrease with time. However, according to the first aspect of the present invention, the woody plants grow during this time, and the soil retaining function is secured for a long time by the rooting of the root system which is much thicker than the herbs.

According to the second aspect of the present invention, woody vegetation is formed along the retaining member, and after the construction of the retaining member is completed, the herbaceous seeds are placed in an area surrounded by the retaining member. Is formed, the trees can be grown in a state where these different vegetations are segregated without being pressed by the herbs.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. FIG. 4 shows an earth retaining member 1 used in the present embodiment. The earth retaining member 1 includes a net-shaped member 2 and a vegetation bag 3.

The net-like member 2 is formed of a synthetic resin material such as polyethylene or polypropylene, and is formed in a cylindrical shape having a substantially square mesh. It is open.
In this embodiment, the total length is about 100 Cm and the outer diameter is about 10 C
m and a mesh size of 3 cm × 3 cm were used.

However, the net-shaped member 2 is formed to have the required rigidity in consideration of the earth pressure acting when the slope N surface soil flows off. In addition, the above-mentioned dimensions are the slope N
Or, as will be described later, have properties that should be variously changed in accordance with the vegetation of the woody tree T to be formed here. For example, the size of the mesh is selected and used so as not to hinder the rooting of the woody trees T or the penetration of the ground system constructed in this embodiment for a certain period in the growth process. In addition, the net-shaped member 2 is not necessarily limited to a cylindrical shape as in this embodiment, and may be, for example, a U-shaped cross-section that opens upward during construction. In such a case, it is not necessary to select the size of the mesh according to the thickness of the ground system, which is an advantageous condition for the growth of the woody plants T in the ground system.

Further, when the net-like member 2 is installed on the slope N, the net-like member 2 is laid on the slope N with a part thereof being exposed to the slope N, and is fixed by driving the anchor 4 or the like under the net-like member 2. Is what is done.

The vegetation bag 3 is also knitted in a bag shape sealed with synthetic fibers such as polyethylene. And
The inside of the tree is necessary for vegetation depending on the slope N to be constructed such as seeds of woody trees T (for example, weasel, yashabushi, yamahagi, etc.), fast-acting and slow-acting fertilizers, and water retention agents. Things are enclosed. This vegetation bag 3
Each of the net-shaped members 2 has a length approximately the same as that of each net-shaped member 2.

Next, the operation and effect of this embodiment configured as described above will be specifically described. The vegetation bag 3 is housed inside the net-shaped member 2 before or before being brought into the construction site. To be integrated as the earth retaining member 1. The earth retaining members 1 thus obtained are arranged in a direction along the slope of the slope N and in a direction orthogonal thereto, and are arranged in a lattice as a whole (see FIG. 1).
In this case, the anchor 4 is driven into the slope N through the mesh of the net-like member 2 so as to bridge each of the earth retaining members 1 and the mutually connected portion. Thereby, each earth retaining member 1 is fixed to the slope N, and is constructed as a lattice fence as a whole.

When the construction of the retaining members 1 is completed as described above, the seeds of the herbaceous G (for example, bermudagrass, island bentgrass, etc.) are placed in the area (grid grid) surrounded by each retaining member 1. A herbaceous vegetation 5 (which also contains a fertilizer and the like) in which a bag of short grass seeds is accommodated in a bag (instead of this, a herbaceous seed and a fertilizer or the like may be sprayed) ). The bag of the herbaceous vegetation 5 used here is made of the same material as the vegetation bag 3 described above.

Thus, after an appropriate number of days have passed, vegetation of woody plants T is formed along the retaining member 1, and vegetation of herbs G is formed in the area surrounded by the retaining member 1. Is done. As described above, in addition to the soil retaining function of the soil retaining member 1 (disposed laterally with respect to the slope N) in the present embodiment, the vegetation forming function of the woody trees T is exhibited. Retaining and greening are achieved at the same time. In this case, since the net-like member 2 is set in a mesh of a predetermined size, the rooting of the woody plants T and the growth of the terrestrial system are not hindered during a certain period during the growth. Absent.

As described above, the earth retaining member is fixed by driving the anchor 4 at the time of construction, and the earth retaining effect is exhibited by itself. However, the anchor effect may decrease with time due to loosening of the ground or the like.
In such a case, the original retaining effect cannot be obtained, but during this time, the growth of woody species is expected, and the wood is used instead of the retaining material by the rooting or between the trees. Earth retaining is made. Therefore, the situation where the retaining effect is reduced with time is avoided,
Long-term earth retaining function is maintained. Moreover, greening is also achieved at the same time.

Incidentally, the net-shaped member 2 gradually deteriorates in the process of growing the trees, and when the trees have grown sufficiently, the mesh does not hinder the passage of the ground system or the root system. Conversely, the net-shaped member 2 has weather resistance until the woody species grows, and serves as a soil retaining during this time.

By the way, the seeds of the herbaceous G germinate and grow in a relatively short period of time, but since the seeds of the herbaceous T grow at a slower rate than these, the vegetation of the herbaceous T is Will be formed after vegetation. However, in this embodiment, the vegetation area of the herbs G is limited to the range of the grid defined by the earth retaining members 1, so that a situation in which the herbs G press the woody T is also avoided. It is beneficial for the formation of heterogeneous vegetation.

The present invention can be variously modified.
The following modifications are also included in the technical scope of the present invention.

In this embodiment, both the woody plants T and the herbaceous plants G are formed, but the herbaceous plants G may be omitted.

The arrangement of the earth retaining member 1 with respect to the slope N is as follows.
It is not particularly limited to the embodiment as long as earth retaining of the slope N can be achieved. For example, as shown in FIG. 5, an arrangement may be made in which a slant is formed with respect to the slope of the slope N and adjacent V-shapes are formed between adjacent ones.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a situation before a herbaceous vegetation is constructed.

FIG. 2 is a perspective view showing a situation after a herbaceous vegetation is constructed.

FIG. 3 is a cross-sectional view showing a construction state on a slope.

FIG. 4 is an exploded perspective view showing an earth retaining member.

FIG. 5 is a perspective view showing another construction situation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Earth retaining member 2 ... Net-shaped member 3 ... Vegetation bag N ... Slope T ... Woody plants G ... Herbaceous plants

Claims (2)

[Claims] 1. A vegetation bag containing woody seeds or the like is accommodated in a net-like member having a mesh through which the roots of the woody seeds can pass, and the earth retaining member obtained in this way is sloped. A slope protection method characterized in that earth retaining is performed by fixing along the slope. 2. The slope protection method according to claim 1, wherein an area surrounded by the earth retaining member is a vegetation area of herbs.