JPH1060901A - Sheet material for preventing erosion of soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adhere a sheet material even in the case of uneven and irregular ground surface so as to prevent erosion of soil by forming a sheet material of synthetic resin or natural fiber, having the specified height, covering the surface of an upper side of a long size sheet material having flexibility with a reinforcing net, and fixing parts near both right and left ends in the longitudinal direction of the long-size sheet material. SOLUTION: A long-size sheet material is formed of synthetic resin or natural fiber, and has a height at 4-20mm. Anchor pins are placed in a reinforcing net 2, which is locked with the sheet material 1, with an appropriate space so as to lock the sheet material with the soil. Since the reinforcing net 2 is not fixed at parts except for parts near both right and left ends in the longitudinal direction of the sheet material 1, when the reinforcing net 2 is stretched, the sheet material 1 is hanged by the dead weight thereof, and adhered to the soil formed with unevenness and irregularity. At the time of rain, the sheet material 1 absorbs water, and the weight thereof is increased more, and the sheet material 1 is adhered along the ground surface. Floating of the sheet material 1 can be thereby prevented to prevent erosion of a soil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like material for preventing soil erosion, and more particularly to a sheet-like material for slope erosion without special leveling and shaping, that is, even on uneven ground or uneven ground. The present invention relates to a sheet-like material that adheres to soil and can effectively prevent soil erosion.

[0002]

2. Description of the Related Art As a simple and effective method for preventing soil erosion on a slope or the like, for example, a porosity of 96 using polyester fiber or the like is used.
The porosity of up to 98% is extremely large, for example, a thickness of 5 to 40 m
m bulky and flexible long sheet (hereinafter simply referred to as “web”)
Is also known in Japanese Patent Application Publication No. 102621/1992. According to the technology using such a web, 1) the web is lightweight and flexible, so that the laying work is extremely easy. 2) The web itself is flexible and easily adheres to the soil. 3) The web absorbs the impact energy of raindrops to prevent destruction of soil particles. 4) The fine fibers constituting the web are entangled with the soil particles and stop the movement of the soil. 5) Rainwater selectively flows through the web, thus reducing the tractive force acting on the ground. 6) Prevent turbid water outflow by the filter effect of the web. The effects such as are expected.

[0003] When the web is used as a soil erosion prevention sheet, the web is generally made of fine fibers and has a bulky and flexible property, so that it tends to be stretched or broken at the time of laying. Conventionally, a reinforcing net is attached to the entire upper surface of the web in order to prevent breakage. The reinforcing net also has a role to be used as a fixing portion between the pin and the sheet in the installation of the anchor pin at the time of laying in order to prevent the sheet from being turned or moved due to the weather. The reinforcing net is a net made of a natural fiber or a synthetic resin, and the reinforcing net and the web are substantially entirely fixed and integrated over substantially the entire upper surface of the sheet by an adhesive method or a joining method.

[0004]

The above-described function of preventing the soil from erosion by the web is realized only when the web is in close contact with the soil. And the function is significantly destroyed.

[0005] Therefore, the soil erosion prevention sheet in which the reinforcing net and the web of the prior art are integrated is premised on being applied after shaping the soil smoothly on an inclined surface. It has the function of preventing soil erosion, but has the problem of reducing this function on uneven ground and uneven ground. The reason for this is that the web itself is flexible, but when anchoring the anchor pin to the reinforcing net in order to fix the web to the soil, the reinforcing net is prevented from becoming tensioned vertically and horizontally. This is because if the reinforcing net is tensioned, the web integrated with the reinforcing net is also in a tensioned state, and the web is lifted in the concave portion on uneven ground or uneven ground.

In order to prevent this, in the industry, careful slope preparation and shaping is carried out after cutting slopes and embankments with a civil engineering machine, but it takes a lot of time and money on a vast slope. . In addition, the leveling and shaping cannot be performed sufficiently, or unevenness that occurs naturally, and in target areas with irregularities, a large number of anchor pins are driven to ensure close contact between the soil erosion prevention sheet and these grounds, The use of multiple pins on sloping land requires a lot of labor in transporting and driving, in addition to this cost.

In view of the present situation, the present invention easily adheres to the soil without specially leveling and shaping slopes such as slopes, that is, easily adheres to soil even on uneven terrain, and effectively erodes soil. It is an object to provide a sheet-like material capable of preventing such a problem.

[0008]

Means for Solving the Problems The present inventor repeatedly conducted various tests to solve the above problems, and as a result,
It has been found that the problem can be solved by securing a specific reinforcing net to the web in a specific manner. That is,

According to the present invention, substantially the entire upper surface of a long sheet of a predetermined width having a thickness of 5 to 20 mm and made of a synthetic resin or / and natural fibers and having a thickness of 5 to 20 mm is a reinforcing net. A soil erosion prevention sheet material which is covered, wherein the reinforcing net and the long sheet material are fixed only in the vicinity of both left and right ends in the length direction of the long sheet material. .

The long sheet used in the present invention is mainly made of a synthetic fiber web such as polyester or polypropylene from the viewpoint of elasticity, water resistance or weather resistance, and has good adhesion to soil. Porosity 80 from above
It has a very large flexibility of about 99.5%, and has the above porosity from the ability to absorb the impact energy of raindrops, to kill rainwater by sweeping the ground, and to prevent turbid water from flowing out. It is preferable that the thickness is 5 to 20 mm.

In general, a conventionally used web can be used as it is as the long sheet material of the present invention. In addition, the surface portions near the left and right ends in the length direction of the long sheet-like material generally have a width of 5 to 100 mm inward from the left and right ends in the length direction of the long sheet-like material, respectively. Is preferred.

In addition, the reinforcing net is non-stretchable, that is, the reinforcing net fixed to the long sheet-like material is stretched at the time of laying the long sheet-like material to make the long sheet-like material in a tension state, and the reinforcing net is connected to the soil. It is necessary that there is substantially no hindrance to the adhesion of the sheet, or the fact that the reinforcing net shrinks due to the change over time after laying, and does not release the long sheet-like material adhered to the soil from the soil. In order to achieve this, a very good result is obtained when the net structure of the reinforcing net is of a square mesh type rather than a diamond mesh type. Here, the square mesh type refers to a net structure in which the fibers constituting the net extend linearly in the longitudinal direction and the width direction of the net, and the longitudinal lines and the width lines have substantially perpendicular intersections. Finger. As the material of the reinforcing net, a material made of a synthetic resin such as polyethylene or polypropylene is usually desirably used from the viewpoint of non-stretchability and weather resistance.

In the most desirable mode of the present invention, a square mesh type reinforcing net is coated on the entire upper surface of the long sheet material, and is directed inward from both left and right ends in the longitudinal direction of the long sheet material. This is an embodiment in which the reinforcing net and the long sheet-like material are connected only at a portion of 5 to 100 mm. The above-mentioned fastening method may be an adhesive or a tape, but mechanical fastening by a stapler or the like is preferable in order to firmly achieve the fastening between the long sheet-like material and the reinforcing net, and furthermore, the sewing machine is not sewn. This is the simplest, most reliable and most recommended locking mode with good productivity.

[0014]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a typical embodiment of the sheet material for preventing soil erosion of the present invention.

It is made of synthetic resin and / or natural fiber,
Substantially the entire upper surface of a long sheet 1 having a bulk and flexibility having a thickness of 5 to 20 mm is covered with a reinforcing net 2 and the left and right sides of the long sheet 1 in the longitudinal direction are covered. The reinforcing net 2 and the long sheet-like material 1 are fixed only in the vicinity of both ends. In general, it is sufficient for the reinforcing net 2 to cover substantially only the entire upper surface of the long sheet-like material 1. However, for example, both ends of the reinforcing net 2 are folded back like a futon cover. If a portion near the back end of the long sheet-like material 1 is covered with the cover, a further reinforcing effect can be obtained. Further, it is better not to cover the back surface of the long sheet-like material 1 other than the vicinity of the end portion with the reinforcing net 2.

FIG. 2 is a longitudinal sectional view showing a case where the sheet material for preventing soil erosion of the present invention is laid on the soil. In general, a reinforcing net 2 fixed to a long sheet material 1 is shown. The long sheet-like material 1 is fixed to the soil 5 by the anchor pin 4 via the reinforcing net 2 by placing the anchor pins 4 at appropriate intervals using Since the reinforcing net 2 is not fixed except in the vicinity of both left and right ends in the length direction of 1, the long sheet-like material 1 having high flexibility hangs down by its own weight even if the reinforcing net 2 is in a tensioned state, It adheres well to uneven soil 5. In addition, if there is rainfall, the long sheet-like material 1 will further increase its weight by being hydrated, and will adhere to the uneven ground and uneven soil along the ground.

In the conventional mode in which the web and the reinforcing net are integrated, the weight tends to increase due to the water content caused by rainfall, but the web tends to hang down. In addition, the phenomenon that the web was lifted from the concave portion of the soil by the reinforcing net due to the weather recovery and drying could not be avoided.

Further, the reinforcing net used in the present invention is stretched vertically and horizontally as a guide when an anchor pin for fixing the long sheet-like material to the soil is not stretched substantially. is required. When the reinforcing net is stretched, the long sheet-like material is also laid in a tensioned state, and it is difficult to hang down, so that the adhesion to the soil is hindered.

When the connection between the long sheet-like material and the reinforcing net is performed by a sewing machine, generally, the sewing machine is sewn by one to three lines as necessary. In FIG. 1, two sewing stitches 3 are provided on both right and left ends.

Also, if a long sheet made of fibers, particularly 3 to 10 denier fine fibers, is brought into close contact with the soil, surprisingly, the fibers at the bottom of the long sheet are reduced in several months. The part shows a state in which it is locked with soil particles, sand, or stone, and this degree increases as time passes. Is this phenomenon due to microbial action or ionization in relation to ultraviolet rays, humidity, temperature, etc., or is it due to the fine fibers entering soil particles, sand, or stone-like microscopic gaps accompanying rainwater? It is not clear whether this is due to or a combination of these.

According to the aspect of the present invention, the long sheet-like material can be easily adhered to the concave portion even on a sloped surface such as a slope having unevenness and unevenness, thereby preventing soil erosion. Then, the long-term sheet-like material is permanently integrated with the soil due to the natural action. In addition, near the end of the long sheet-like material to which the reinforcing net is fixed, when the long sheet-like material is laid on the soil, the adhesion with the soil is mechanically maintained from the beginning by placing anchor pins. ing.

[0022]

EXAMPLE A 10 mm thick, 1,000 mm wide, 46 g / m2 fabric made of 3 to 6 denier polyester fiber.
^2. A 1,050 mm wide polyethylene reinforced net integrally formed in a square mold is sewn and stitched only at the portions having a width of 100 mm inward from the left and right ends of the long, long sheet-like material. Then, the entire upper surface of the long sheet was covered to obtain a sheet for preventing soil erosion of the present invention.

Further, the long sheet-like material and the reinforcing net are sewn in the longitudinal direction of the long sheet-like material at intervals of 9 cm in the width direction, and the long sheet-like material and the reinforcing net are connected substantially entirely. The stopped one was used as a comparative example. Excavation of two grooves with a width of 20 cm and a depth of 12 cm over a length of 2 m along the slope of the embankment slope (slope length 4 m, inclination angle 30 degrees) at intervals, and soil erosion of the present invention in each of them The sheet material for prevention and the sheet material of the comparative example are laid, and each end is 50 cm.
The test was carried out by fixing to the soil with anchor pins at intervals. Table 1 shows the measurement results of the hanging state of the sheet-like material at the excavated portion.

[0024]

[Table 1]

The product of the present invention is in a ground contact state even after drying after rainfall, and after six months, the sheet-like material of the present invention is in a state of being completely adhered to the digging groove, and the shape of the digging groove is laid. It was observed that the erosion prevention function was maintained in the previous state. On the other hand, in the comparative example, the subsequent dripping conditions during water-containing and drying were similar to those in Table 1, and the same numerical values as those shown in Table 1 were repeated. The distance between the object and the soil surface has increased. The groove wall collapsed and the groove had grown to the slope bottom.

[0026]

As described above, in the sheet material for preventing soil erosion of the present invention, substantially the entire upper surface of a flexible bulky long sheet material is covered with a reinforcing net. Since the reinforcing net and the long sheet-like material are fixed only in the vicinity of both the left and right ends in the length direction of the long sheet-like material, the vicinity of both ends is excluded even if the reinforcing net is laid in a tensioned state. The part of the sheet-shaped material hangs down on the concave due to its own weight on uneven or uneven soil ground, and after being wetted by rainfall, it increases in weight and adheres to the soil along the concave, maintaining this state and effective in soil erosion Prevention. In other words, the sheet material for soil erosion prevention of the present invention does not require special leveling of the slope or the like, and erosion due to rainfall or the like can be satisfactorily prevented without shaping, thereby eliminating the need for leveling and shaping work and greatly shortening the construction period. This is extremely advantageous in terms of cost. Also,
It is also useful as an early maintenance measure for naturally occurring slopes and can prevent secondary disasters. In addition, the use of non-stretchable reinforcing nets makes it easy to register the laying.In the past, if a sheet-like material was forced to adhere to uneven or uneven ground, a large number of anchor pins would be required. Although the use and the number of man-hours required, the use of the sheet for preventing soil erosion according to the present invention eliminates such inconveniences, and there is a great advantage in terms of labor saving and cost. Furthermore, if seeds and a medium are appropriately supported on the sheet-like material for preventing soil erosion of the present invention, the adhesion of the soil is increased due to the drooping of the sheet-like material due to an increase in weight, and early vegetation is possible. That is, in addition to soil erosion prevention, the non-land portions and depressions covered with the soil erosion prevention sheet-like material of the present invention are effective for stable introduction of native plant seeds and organic matter that fly, and are effective in introducing natural vegetation, especially woody trees. It is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a typical embodiment of a sheet material for preventing soil erosion of the present invention.

FIG. 2 is a longitudinal sectional view when a sheet material for preventing soil erosion of the present invention is laid on soil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long sheet material 2 Reinforcement net 3 Sewing machine 4 Anchor pin 5 Soil

Claims (3)

[Claims] An upper surface of a long sheet of a predetermined width having a thickness of 5 to 20 mm, which is formed of a synthetic resin and / or a natural fiber and has a thickness of 5 to 20 mm, is coated substantially entirely with a reinforcing net. A sheet material for preventing soil erosion, wherein the reinforcement net and the long sheet material are fixed only in the vicinity of both left and right ends in the longitudinal direction of the long sheet material. 2. The portion near the left and right ends in the length direction of the long sheet-like material is a portion having a width of 5 to 100 mm inward from both left and right ends in the length direction of the long sheet-like material. The sheet material for preventing soil erosion according to claim 1. 3. The sheet material for preventing soil erosion according to claim 1, wherein the reinforcing net is a square mesh type net made of natural fiber and / or synthetic resin material.