JPH0549766B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for protecting the slope of an embankment, which can prevent the slope of an embankment from collapsing and construct a slope with excellent aesthetic appearance.

<Conventional technology> Generally, slopes of embankments have insufficient compaction force or are prone to collapse due to rainwater, etc., so various simple protection techniques have been researched to prevent such collapses. ing.

For example, when constructing an embankment, a large amount of embankment is not dumped all at once, but is constructed by layering the embankment in multiple layers.

Moreover, sheet materials such as non-woven fabrics are interposed horizontally between each embankment layer to strengthen the ground.

In addition, the slopes of each embankment layer are covered with sheet materials or stacked with sandbags to cope with earth pressure.

<Problems to be Solved by the Present Invention> The conventional embankment slope protection techniques described above have the following problems.

(b) Some of the sheet materials and sandbags will be left exposed on the slope surface.

Therefore, if the sheet materials or plastic bags that make up the sandbags deteriorate and break, there is a risk that the slope will collapse.

(b) When protecting the slope by covering it with sheet material, formwork is required to hold down the slope of each embankment layer.

Therefore, as the embankment layers are piled up, it becomes more troublesome to install the formwork.

(c) The surface of the slope has sheet materials, sandbags, etc. exposed, which tends to spoil the aesthetic appearance of the environment.

(d) The method of stacking sandbags has poor drainage and requires separate drainage works.

Moreover, it takes a great deal of effort to manufacture and transport the heavy sandbags.

<Object of the present invention> The present invention was made in view of the above points, and provides a method for protecting the slope of an embankment, which is excellent in workability, aesthetics, and drainage, and can reliably prevent slope collapse. The purpose is to

<Structure of the present invention> An embodiment of the present invention will be described below with reference to the drawings.

<A> Slope protection method (Fig. 1) In the case where sheet materials 1 such as non-woven fabrics and embankment layers are alternately laid, the present invention provides a method of protecting the slope surface by adding vegetated soil 6 together with the sheet materials 1 at the slope position of the embankment. In this method, a vegetation basket 2 that accommodates the grass is attached to protect the slope by greening it.

[Sheet Material] (Fig. 1) As the sheet material 1, in addition to water-permeable nonwoven fabric, thermoplastic fibers such as polyamide, polyethylene, polystyrene, net fabric, or composites thereof can be used.

[Vegetation Basket] The vegetation basket 2 is a hollow cage body, and is used by storing vegetation soil 6 containing seeds and fertilizer inside.

As the vegetation basket 2, for example, a known futon basket made of wire mesh can be used.

Further, one end of the auxiliary sheet 3 is integrally attached to the bottom of the vegetation basket 2.

<B> Method of constructing embankment (1) Installation of sheets (Figure 3) Install the vegetation basket 2 with the auxiliary sheet 3 on the foundation ground 4.

At this time, the auxiliary sheet 3 is laid on the foundation ground 4, and the vegetation basket 2 is erected on the foundation ground 4.

Next, the middle of the sheet material 1 is overlapped on the inside of the auxiliary sheet 3 and the vegetation basket 2, and the sheet material 1 is fixed to the auxiliary sheet 3 and the vegetation basket 2, respectively.

The free end of the fixed sheet material 1 is rolled up over the vegetation basket 3.

(2) Compaction of earth and sand and accommodation of vegetation earth and sand (Fig. 4) Next, earth and sand are rolled on top of this sheet material 1 to construct an embankment layer 5.

In parallel with the compaction of the earth and sand, the vegetation earth and sand 6 containing seeds are put into the vegetation basket 2.

Next, the sheet material 1 rolled up in front of the vegetation basket 2 is turned over and laid on the upper surface of the embankment layer 5.

(4) Lamination of embankment layers (Fig. 1) Using the top surface of the embankment layer 5 as the foundation surface, lay the new vegetation basket 2 with the auxiliary sheet 3.

Furthermore, a separate sheet material 1 is attached to the inside of the auxiliary sheet 3 and the vegetation basket 2 to construct an embankment layer 51.

Next, vegetation soil 6 is stored in the vegetation basket 2 located in front of the embankment layer 51.

When constructing the embankment layer 51, rolling up the free end of the newly laid sheet material 1 in front of the vegetation basket 2 is similar to the process described above.

In addition, the vegetation basket 2 that accommodates the vegetation soil 6 includes:
The earth pressure of the embankment 5 acts in the direction of overturning, but the bottom surface of the vegetation basket 2 is in surface contact with the auxiliary sheet 3, forming an integral structure, and the auxiliary sheets 3 located above and below the vegetation basket 2 are in contact with the embankment layer. Since the vegetation basket 2 is held under the earth pressure of 5, the overturning of the vegetation basket 2 is prevented.

The above steps are repeated to build up each embankment layer to a predetermined height.

In addition, the storage period of each vegetation earth and sand 6 may be any period before or after the earth and sand is compacted.

(5) Vegetation Since the vegetation basket 2 containing the vegetation soil 6 is located on the slope of each embankment layer 5, 51, various plants etc. will germinate after construction.

Roots of germinated plants are deposited in vegetation soil 6 and each embankment 5,
51...grows inwards and contributes to the stability of the slope.

<Effects of the Present Invention> Since the present invention is as explained above, the following effects can be obtained.

(b) The sheet material that functions as a reinforcing material is not exposed on the slope, but is buried underground inside the vegetation cage.

Therefore, there is no fear that the sheet material will deteriorate due to exposure to ultraviolet rays, etc., and the stability of the slope can be maintained semi-permanently.

(b) The vegetation basket that holds the vegetation soil also functions as a formwork to hold down the embankment, so it can be constructed even on steep slopes.

(c) Since the work involves simply arranging the vegetation baskets and sheets and building the embankment, the work is not labor-intensive and the embankment can be constructed efficiently.

Therefore, compared to conventional construction methods, the construction period can be significantly shortened and it is economical.

(d) The slopes of each embankment layer will be covered with plants and flowers, so the landscape will be good.

(e) The sheets interposed between each embankment layer and the vegetation basket covering the front of the embankment layer are made of water-permeable materials, so drainage is good.

In addition, the sheets interposed between each embankment layer are
Since water in the ground can be actively absorbed and drained, it is possible to reduce the shear strength of the earth and sand, reduce earth pressure, and prevent liquefaction of the earth and sand.

In addition, early compaction of the embankment progresses to prevent uneven settlement after completion.

[Brief explanation of the drawing]

Figure 1: An explanatory diagram of an embodiment of the present invention, Figure 2:
Explanatory diagram of the vegetation basket, Figures 3 and 4: An explanatory diagram when constructing the lowest embankment layer.

Claims (1)

[Scope of Claims] 1. A slope protection method in which water-permeable sheet materials and embankments are alternately laid down and the surface of the embankment is covered with the sheet materials, in which the slope of the embankment is greened by repeating the following steps. A method for protecting slopes of embankments. A step in which a cage body is placed at the planned location on the slope of the embankment, and an auxiliary sheet material with good water permeability attached to the lower part of the cage body is laid on the ground surface where the embankment will be performed. a step of arranging a sheet material so as to cover the cage body and the auxiliary sheet material; After filling the cage up to the vicinity of the upper end, the step of covering the surface of the car with the sheet material. A step of storing vegetation soil containing seeds etc. in the cage body.