JPS5820339B2 - Slope stabilization vegetation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a construction method that stabilizes the slope and allows vegetation to grow on slopes where it is difficult to grow vegetation, such as bedrock, or on soft rock slopes where surface soil is often washed away.

Conventionally, among soft rock cut slopes, especially sedimentary soft rocks are hard in dry conditions, but if they contain moisture due to rain etc., they easily weather and it is extremely difficult to grow vegetation on the slopes. An essential requirement is the presence of a substrate for plant growth.

Various construction methods have been tried for vegetation such as the above-mentioned sedimentary soft rock, but success is rare. ,
A construction method in which low slump mortar or concrete is sprayed into the formwork to reinforce the ground, and the formed structure is used as a base to provide a base layer for vegetation and vegetation, or cement, sand, fiber. A construction method has been implemented in which a material and an adhesive are mixed and the mixture is sprayed onto the rock described above.

However, these construction methods had the following drawbacks.

(b) Since formwork is formed on both sides, rebound (splashed objects) such as low slump mortar sprayed into the formwork cannot escape outside the formwork, and mortar etc. It becomes a sand pocket-like condition with many voids, and in just a few years it becomes crumbly and weathered and loses the strength of mortar.

This means that even if the formwork is a wire mesh plate with large squares, the rebound that tries to escape outside the formwork will escape slightly at first, but most of the rebound will hit the wire mesh plate and bounce back. I tried to glue it to prevent the squares, but in the end I ended up with mortar that looked like foxtail.

In addition, when this kind of rust occurs, if the formwork or reinforcing bars are installed within the formwork, the formwork or the reinforcing bars will come into contact with air, and the reinforcing bars will rust, significantly reducing their strength.
Dogs are at risk of reducing the strength of the lattice frame metal body, leading to collapse.

(b) Since the formwork on both sides is not practical unless it has a shape that adapts to the unevenness of the slope, it is necessary to construct a special formwork, and in addition, the formwork must be installed so that it stands on the slope.
This requires advanced technology and construction time, making it uneconomical.

In particular, many of the slopes to which this method is applied are made of rock, which makes it difficult to shape the slope to a flat surface, resulting in extreme unevenness (some parts have reverse slopes).

), and a significant portion of the formwork on both sides rises above the slope, reducing the meaning of the formwork by half.

It is impossible to eliminate such unevenness of the slope, and in practice this construction method is impossible.

(c) Structures made of mortar or concrete may cause alkaline content of cement (commonly known as aku) to ooze out from the structure, and if vegetation grows within the lattice frame formed by the structure, this alkaline content will cause vegetation to grow. In addition, structures made of mortar or concrete were problematic because they did not maintain harmony with the surrounding landscape.

) Mix cement, sand, fibrous material and binder;
A method of spraying on slopes such as bedrock is also used to form a relatively thick vegetation base by consolidating by mixing cement, but this method requires the addition of cement (
Without cement, a thick vegetation base cannot be formed.

) Therefore, the alkaline content of cement contaminates the vegetation base, often inhibiting the growth of vegetation as in (c) above, and complete vegetation cannot be achieved at an early stage.

Furthermore, the most desirable form is to ultimately restore the slope to its original form, and if a construction method that emphasizes this is implemented, the structure cannot be used, resulting in insufficient protection of the slope at the initial stage of construction. There was the contradictory problem that once a structure was erected, it could not be restored to its original state.

The present inventor studied the drawbacks of the conventional lattice frame described above (( The purpose is to provide a construction method that can stabilize the slope and form a base layer for plant growth.

That is, the present invention involves spraying fill cement with a low flow value onto a reticular body such as a wire mesh stretched over a slope to form an appropriately sized lattice-shaped bulging frame body made of fill cement. A lattice-like frame is formed using one or several reinforcing bars with or without a mesh, and fill cement with a low flow value is sprayed onto the lattice-like frame portion, and appropriate fill cement is applied. This is a slope stabilizing vegetation construction method characterized by forming a large lattice-shaped bulging frame and then growing vegetation within the lattice-shaped frame.

The present invention will be described in more detail with reference to examples.

Example 1 A wire mesh 5 with a mesh size of 4 to 6 cm is stretched over the entire surface of the slope 1 on which the present invention is to be carried out, and lath pins (raspins) are applied at about one place every 1 to 3 m.
Fix it with an iron nail (diameter 9mm, length 30cIrL) and insert it into the groove provided on the shoulder of the wire mesh, or use an anchor (iron nail diameter 16m).
m, length 40crIL) and fix it.

Next, mark the areas where fill cement is to be sprayed in a grid pattern, and spray fill cement with a low flow value (120 to 190 mm) on the marked areas using the same method as for ordinary method coating. 10~15crrL, lower end (slope adhesive part) width 20~30cfrL, thickness 15~20crrL
Vegetation work, which will be described later, is carried out within a frame formed by forming soil cement bulges into a lattice-like bulge frame 6 of sections each measuring 1 to 2 m on a side.

Example-2 The slope 1 on which the present invention is to be implemented has a diameter of 6 mm to 101 nm.
1n reinforcing bars 2 are combined in a grid shape with one side of about 1 to 2 m,
The intersection of reinforcing bars 2 has a diameter of 16 mm and a length of 40 cr to 50
The crrL anchor 3 is driven into the ground leaving about 10 cIrL, and the reinforcing bars are supported using binding wires.

Also, the reinforcing bars between the intersection points have a diameter of 9 mm and a length of 30 cIrL.
Drive 1 to 3 lath pins 4 of the same size between the intersection points, and support them using the ending lines in the same way as the intersection points.

When there are a plurality of reinforcing bars 2, for example, four anchors are driven near the intersections of the reinforcing bars 2, and the reinforcing bars 2 are supported and tied together in a parallel grid shape, and stacked in one or several stages to form a lattice-like frame.

Next, a fill cement having a low flow value similar to that in Example-1 is sprayed onto the lattice-shaped frame portion to form a lattice-shaped bulging frame body 6 having the same specifications as in Example-1.

Vegetation work, which will be described later, is applied within the frame thus formed.

Example 3 After stretching the mesh body 5 of Example 1 on the slope where the present invention is to be carried out, a lattice frame made of reinforcing bars of Example 2 is formed, and a low Fill cement having a flow value is sprayed to form a lattice-shaped bulging frame 6 having the same specifications as in Example-1.

After that, vegetation will be applied within the frame.

In order to improve the workability and the strength of the lattice-like bulging frame to be sprayed in the low flow soil cement sprayed in Example 1.2.3 above, a fly assembling calcium carignin sulfonate aqueous solution or Fibrous materials such as alkali-resistant glass fibers may be added.

In order to grow vegetation within the frame formed by the lattice-shaped expanded frame formed in Examples 1 and 2.3 above, vegetation seeds suitable for the site, chemical fertilizers, park compost, organic fibers such as peat moss, etc.
Soil improvement materials, soil and other vegetation base materials are appropriately combined and mixed.
The plant growth base layer 7 is formed by spraying a layer slightly thinner than the thickness of the swelling body using a power sprayer.

Depending on the situation, a film forming agent such as asphalt emulsion may be sprinkled over this, or a net-like material such as polyethylene net may be stretched over it.

Formation of the plant growth base layer 7 by spraying the vegetation base material is done to a thickness of around 10 CIrL, and seeds located in the lower layer will have difficulty germinating, so it is difficult to germinate soil, organic fibers, composted fertilizers, etc. After spraying the base material, seeds may be sprayed thereon alone or in combination with the above-mentioned film forming agent.

In addition to the method of forming the plant growth base layer 6 by spraying as described above, for the vegetation construction, soil paste 8 containing seeds may be applied or soil paste 8 may be applied.
In some cases, a mixture of seeds and vegetation substrate may be sprayed after the seedlings have been set.

As described above, the present invention relates to a slope stabilizing vegetation construction method in which fill cement with a low flow value is sprayed using a net-like body such as a wire mesh, reinforcing bars, etc. as a supporting material to form a lattice-like bulging frame body and vegetation is grown within the frame. Therefore, conventional formwork on both sides is installed, and low slump mortar or concrete is sprayed inside the formwork.
Compared to the method of growing vegetation within the frame, this method does not require special materials or techniques for assembling and installing the formwork when forming the lattice-shaped bulging frame, and the lattice-shaped bulging frame can be easily adapted to slopes. can be formed,
Even when spraying fill cement with a low flow value, the sprayed fill cement scatters smoothly and does not become scaly, and the strength of the formed frame is excellent.

Additionally, the alkaline content of cement (commonly known as scum) oozes out from frames made of mortar or concrete, which can inhibit the growth of vegetation, but according to the present invention, spraying reduces the amount of cement in the material. There is almost no inhibition of vegetation due to the buffering effect of mixed soil.

This is the same when comparing the method of forming a thick layer of vegetation base by spraying cement, sand, fibrous materials, etc.; Since materials suitable for the growth of vegetation can be selected and used, complete vegetation can be established at an early stage.

In addition, the soil cement sprayed onto the landscape has almost the same color as the local soil, so even when forming a frame-like structure, it harmonizes very well with the local landscape and, together with the lush vegetation, looks natural. It creates beautiful scenery.

・Furthermore, since the bulging body is made of fill cement, the bulging body will serve as a structure (slope frame) on the slope for about 5 years after construction, and after about 5 years, the bulging body will begin to bulge. As the body gradually weathers, vegetation begins to grow on the bulge itself, and eventually the mountain can be restored to its original form, providing ideal slope protection.

As described above, the present invention has the excellent effect of stabilizing the slope and creating a foundation for vegetation in a simple manner at low cost and in a short period of time.

[Brief explanation of the drawing]

Figure 1 shows reinforcement 7 on a slope where Embodiment 2 of the present invention is implemented.
Fig. 2 is a perspective view showing the place where wire mesh was laid and reinforcement was placed on the slope in which the present invention-3 was implemented, and Fig. 3 is a cross-sectional view of the slope in which the invention-3 was implemented. , FIG. 4 is a partially sectional perspective view showing implementation of Example-1 or Example-3. In the figure, 1 is a slope, 2 is a reinforcing bar, 3 is an anchor that supports the intersection of the reinforcing bars, 4 is a lath pin that supports the intersection of the reinforcing bars, 5 is a net-like body such as a wire mesh, 6 is a bulging body, and 7 is a sprayed The vegetation layer formed by 8 is soil.

Claims (1)

[Claims] 1. A lattice-like frame is formed using one or several reinforcing bars on the slope, and soil cement with a low flow value is sprayed onto this lattice-like frame portion, and an appropriately large amount of fill cement is applied. A slope stabilizing vegetation construction method characterized by forming a lattice-like bulging frame and growing vegetation within the frame. 2. A net-like material such as a wire mesh is stretched on the slope, and then fill cement with a low flow value is sprayed to form a lattice-like bulging frame of an appropriate size with fill cement, and vegetation is grown within the frame. A slope stabilization vegetation construction method. 3 After setting up a mesh such as wire mesh on the slope, form a lattice-like frame using one or several reinforcing bars on this mesh, and fill the lattice-like frame with fill cement with a low flow value. A soot slope stabilizing vegetation construction method characterized by spraying soil cement to form a lattice-like bulging frame of an appropriate size and growing vegetation within the frame.