JP2578929B2 - Slope protection method - Google Patents

Description

The present invention relates to a slope protection method.

[Prior Art] Various methods are known for protecting the soil on the slope, preventing erosion and greening.

In these construction methods, a mat with a slope protection block, in which a large number of concrete blocks are fixed to a nonwoven filter sheet, is laid on the slope. At the factory, concrete is poured into the formwork at the factory, a filter sheet is laid on the formwork before the concrete solidifies and joined to the block, and after curing, the formwork is inverted and removed, or the filter sheet is removed. The blocks are bonded with an adhesive.

After transporting such mats to the site and laying them up, the shoulders are fixed to the shoulders by driving in anchors or embedding concrete, and then the gaps between the concrete blocks and / or through holes formed in the concrete blocks The soil is thinned out and vegetated on the soil.

[Problems to be Solved by the Invention] In the above-mentioned conventional construction method, since a non-woven filter sheet is used for the mat, the coefficient of friction with the ground surface is small, and the sheet separates the soil from the underlying soil. Therefore, the filter sheet easily slides on the slope. Therefore, it is necessary to prevent the filter sheet from sliding particularly on a slope having a large slope.

In addition, since the non-woven cloth has a relatively small porosity, it is difficult for the roots of the plant to spread on the lower soil through the filter sheet, and the effect of greening is reduced.

An object of the present invention is to provide a slope protection method suitable for a slope with a large slope and improving the effect of greening.

[Means for Solving the Problems] The slope protection method according to the present invention is a fiber assembly in which relatively thick synthetic resin fibers are blown out from a nozzle onto a plane and entangled with each other to form a relatively thick mat having a large porosity. The body is laid on the slope, a net is formed by piercing and extending a synthetic resin sheet on the fiber assembly and formed into a net shape. Concrete is placed in a spot shape, a concrete block is placed on the mortar or concrete, and the concrete block, the net body and the fiber assembly are integrally fixed by mortar or concrete, and soil is inserted into a gap between the concrete blocks. And vegetation on the soil.

The above-mentioned fiber assembly is, for example, formed by blowing polypropylene onto a plane with a thickness of about 1 mm, for example, by thermoforming with an extrusion machine, for example, using a thing formed to a thickness of about 10 mm, and laminating a net body on the plane side. It is preferable to use the matching side.

Further, it is preferable to use a net body in which holes are formed in a polymer sheet and then expanded to form a net having a mesh size of, for example, about 3 mm in length and about 40 mm in width.

The concrete block may have any shape such as a square, rectangular, or triangular plane, and may have a recess such as a semicircle in the drawing and a through hole such as a circle in the center. Is preferred.

[Operation] According to the slope protection method configured as described above, the fiber aggregate has a large coefficient of friction with the ground surface, and thus reliably prevents the mat from sliding on a slope having a large slope.

In addition, the net body supplements the tensile strength lacking in the fiber assembly, and cooperates with the fiber assembly having a high porosity to connect the soil to the soil below and further prevent the mat from sliding.

Further, as a fiber aggregate having a large porosity and a net body, it is easy for the roots of the plants of the soil to be spread on the lower soil, thereby promoting the growth of the plants.

This method is convenient because it can be carried out on site using a concrete mixer.

In addition, the fiber assembly can be laid by transporting a stack of net bodies to the site and suspending with a crane via hanging hardware.

In particular, since the fiber aggregate has a drainage function and the net body has a tensile strength, the combination of the two facilitates handling and contributes to plant growth.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show the whole of the embodiment of the present invention, designated by the reference numeral 1.
The mat 1 has a completed state of the mat with the slope protection block, and the mat 1 includes a fiber assembly 2, a net body 4 superimposed on the fiber assembly 2, It consists of a concrete block 6 placed on top and a mortar or concrete 8 fixing these three together.

As shown in FIG. 2, the fiber aggregate 2 is formed from polypropylene by thermoforming with an extruder, for example, from a nozzle.
A relatively thick fiber 3 of 1 mm is blown out onto a flat plate A, and the fibers are entangled with each other to form a relatively hot mat having a large porosity of, for example, about 10 mm.

The net body 4 is formed by perforating holes in a polymer sheet, extending in two axial directions, and forming a net 5 having a size of, for example, 30 mm in length and 40 mm in width as shown in FIG.

The concrete blocks 6 are formed, for example, in a square having a plane of 200 mm and a rectangle having a height of 50 mm, and are provided with a gap of, for example, 50 mm mutually in FIG.
They are arranged at a pitch of m. The concrete block 6 has an inner diameter of, for example, 120 mm as shown by a chain line.
It is possible to form vegetation by forming through holes 7 of a certain degree and filling the through holes 7 with soil.

At the time of construction, the fiber aggregate 2 is placed on the slope B and the top end C,
Flat plate A during formation so that the longitudinal direction is the slope direction of the slope
It is laid with the side (FIG. 4) facing up (FIG. 6).

Next, the net body 4 is laid and laid on the fiber assembly 2 (FIG. 7).

Next, a predetermined position on the net body 4, that is, a vertical position,
A predetermined amount of mortar or concrete 8 is laid in spots at a pitch of 250 mm horizontally (FIG. 8). The predetermined amount of the mortar or concrete is preferably an amount sufficient to fill the bottom surface of the block 6 and to fix the net body 4 and the fiber aggregate 2 integrally as shown in FIG.

Next, the concrete block 6 is placed on the mortar or concrete 8 and pressed to adhere to the mortar or concrete 8 (FIG. 9).

Finally, the soil D is filled in the gaps between the concrete blocks 6, and vegetation is completed on the soil D to complete the construction (No. 9).
Figure).

In FIG. 7, an appropriate number of anchors (not shown) are driven into the top end 1a and, if necessary, the slope 1b to fix the fiber assembly 2 and the net body 4 to the top C and the slope B.

In addition, the joint between the adjacent mats 1A, 1B and 1C (10th
As shown in FIG. 11, in the width direction of the mat, that is, between the mats 1A and 1B, as shown in FIG.
Is shifted on the net body 4 of the other mat 1A by shifting only the net body 4 of the other mat 1A. On the other hand, in the longitudinal direction of the mat, that is, between the mats 1A and 1C, as shown in FIG. 12 and FIG.

In FIG. 7, as shown in FIG. 14 and FIG. 15, a stack E of the fiber assembly 2 and the net body 4 is transported to the site at the factory, and the It can be lifted and laid by a crane (not shown).

In FIG. 9, as shown in FIGS. 16 to 17, the gap between the blocks 6, 6 is filled with mortar or concrete 8, and the soil D is inserted into the through holes 7 formed in the block 6. It can be stuffed and vegetated on the soil D.

[Effects] Since the present invention is configured as described above,
The large coefficient of friction of the fiber aggregate, the soil by the aggregate and the net body, and the integration of the soil below reliably prevent the mat from sliding on the slope, and are suitable for slopes with a large slope. Apply and protect slope soils and prevent erosion.

In addition, the fiber aggregate and the net body facilitate the planting of the plant vegetation on the guest soil to take root in the lower soil, and can improve the effect of greening.

Also, it can be easily constructed on site and is convenient.

[Brief description of the drawings]

1 is a plan view showing a completed state of a mat with a slope protection block embodying the present invention, FIG. 2 is a side view, and FIG.
The figure is a partially enlarged view of FIG. 2, FIG. 4 is a side view of a fiber assembly, FIG. 5 is a plan view of a net body, and FIG. 6 to FIG. 10, FIG. 10 is a plan view showing a mat laid state, FIG. 11 is a sectional view taken along the line II of FIG. 10, and FIG. 12 and FIG.
14 and 15 are side and perspective views showing a laid state of the fiber assembly and the net body superimposed, and FIGS. 16 to 18 are intermediate views. It is the side view, top view, and sectional side view which show another aspect of packing. B ... slope, C ... top end, D ... soil, 1 ... mat with slope protection block, 2 ... fiber assembly, 3 ... fiber, 4 ... mat body, 6 ... Concrete block, 8
…… mortar or concrete

Claims (1)

(57) [Claims] 1. A fiber aggregate formed by blowing relatively thick synthetic resin fibers from a nozzle onto a plane and entangled with each other to form a relatively thick mat having a large porosity on a slope.
On the fiber aggregate, a net body formed by perforating and extending a synthetic resin sheet to form a net is superimposed and laid, and mortar or concrete is spotted at a predetermined position of the net on the mat body. A concrete block is placed on a mortar or concrete, and the concrete block, the net body and the fiber assembly are fixed together by mortar or concrete, and the soil is filled in gaps between the concrete blocks. A slope protection method characterized by vegetation.