Soil erosion prevention mat, slope soil protection structure, and method for preventing soil erosion of slope soil

Abstract

To provide a mat for soil erosion prevention which can more simply and effectively protect inclined surface soil.SOLUTION: A mat 100 for soil erosion prevention includes: a flexible mat body 101 which vertically extends, has a longitudinal direction arranged in an inclination direction of inclined surface soil, and is configured to reduce erosion of a soil surface; and one or a plurality of flow rate reduction materials 110 which are mounted on the surface of the mat body 101 to reduce a flow rate of flowing water that flows on the surface of inclined surface soil. The flow rate reduction material 110 is formed into such a long cylindrical shape as to extend over the whole in a lateral direction of the mat body 101, and is configured to form a weir having a predetermined height in a vertical direction from the surface of the mat body 101.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a soil erosion prevention mat that is installed on slope soil to reduce soil erosion of the slope soil, a slope soil protection structure using the soil erosion prevention mat, and a method for protecting slope soil using the soil erosion prevention mat. [Background technology]

[0002] In recent years, intermittent rainfall and torrential rain have caused erosion of the surface soil of slopes, resulting in disasters such as landslides. Various measures have been taken to reduce or prevent soil erosion on slopes.

[0003] Patent Document 1 discloses a sheet-like material for preventing soil erosion that adheres closely to the soil surface to prevent soil erosion. In the following paragraphs, the reference number for Patent Document 1 is indicated in parentheses. The long sheet-like material (1) for preventing soil erosion is made of synthetic resin and / or natural fibers, and is bulky and flexible, measuring 5 to 20 mm thick. Substantially the entire upper surface of the long sheet-like material (1) of a predetermined width is covered with a reinforcing net (2), and the reinforcing net (2) and the long sheet-like material (1) are fastened only near both ends in the longitudinal direction. By driving anchor pins (4) at appropriate intervals using the reinforcing net (2) fastened to the long sheet-like material (1), the long sheet-like material (1) is fastened to the soil (5) via the reinforcing net (2) by the anchor pins (4). The highly flexible long sheet-like material (1) sags under its own weight, allowing it to adhere well to uneven or textured soil (5). In addition, when it rains, the long sheet material (1) absorbs water and becomes even heavier, allowing it to adhere to the ground even on uneven or uneven soil. In other words, it easily adheres to the soil even on uneven or uneven ground, effectively preventing soil erosion.

[0004] Patent Document 2 discloses a log structure that uses logs to prevent the erosion of surface soil on a slope. In the following paragraphs, the reference number for Patent Document 2 is indicated in parentheses. The log structure (1) is installed on a slope as a log reinforcement structure to prevent the erosion of surface soil and protect vegetation. The main components of the structure are logs (11) arranged in a substantially horizontal orientation on the slope's ground (15), multiple upper logs (12) stacked on top of the logs, a fully threaded steel bar (13) that vertically penetrates the logs (11) and the upper logs (12) and penetrates into the ground, and a nut (14) twisted to the top of the fully threaded steel bar (13) and fastened to the top of the upper log (12). Such log reinforcement structures are generally constructed to dam surface water flowing down a slope to reduce flow velocity and disperse rainwater. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 10-60901 [Patent Document 2] Patent Publication No. 2021-25314 Summary of the Invention [Problem to be solved by the invention]

[0006] By closely covering the surface of slope soil with an erosion prevention mat such as that described in Patent Document 1, it is possible to cushion the impact of raindrops and reduce sediment runoff. However, covering the slope soil with a mat alone is ineffective at reducing the flow rate of surface water and therefore fails to adequately protect the slope soil. Therefore, particularly in mountainous areas, the use of log reinforcing bars as described in Patent Document 2 in combination with the mat can provide the effect of reducing the flow rate of surface water. However, when a mat is laid on slope soil with log reinforcing bars, it is inevitable that the mat will be interrupted, resulting in areas where the surface is not protected. This has been a problem, as erosion damage can be concentrated in areas where the mat is interrupted, leading to the formation of underground waterways and the risk of even larger landslides. Another problem is the effort and labor required to construct log reinforcing bars on slope soil. Therefore, the inventors aimed to provide a soil erosion prevention mat that can protect slope soil by reducing the flow rate of surface water and sediment runoff without causing the above-mentioned drawbacks.

[0007] The present invention has been made to solve the above-mentioned problems, and its object is to provide a soil erosion prevention mat that enables easier and more effective protection of slope soil, a slope soil protection structure using said soil erosion prevention mat, and a method of protecting slope soil using said soil erosion prevention mat. [Means for solving the problem]

[0008] A soil erosion prevention mat according to one embodiment of the present invention is a soil erosion prevention mat that is installed on slope soil to reduce soil erosion, and includes: a flexible mat body extending lengthwise and widthwise, the lengthwise direction of which is arranged along the slope direction of the slope soil, and configured to reduce erosion of the soil surface; and one or more flow velocity reduction materials attached to the surface of the mat body for reducing the flow velocity of water flowing on the surface of the slope soil; The flow velocity reduction material is formed in a long cylindrical shape extending across the entire lateral direction of the mat body, and is configured to form a dam having a predetermined height vertically from the surface of the mat body.

[0009] According to one embodiment of the soil erosion prevention mat of the present invention, the flexible mat body covers the slope soil, thereby reducing the erosion of soil and sand. Furthermore, by attaching a cylindrical flow velocity reduction material extending across the entire width of the mat body to the surface of the mat body and forming a weir with a predetermined height vertically from the surface of the mat body, it is possible to simultaneously reduce the flow velocity of surface water without creating any discontinuities in the mat body. Therefore, the soil erosion prevention mat of the present invention can continuously cover the protected area of ​​slope soil while reducing the flow velocity of surface water. Furthermore, by attaching the flow velocity reduction material to the surface of the mat body, the soil erosion prevention mat of the present invention can reduce the flow velocity of surface water similar to that of log reinforcement, thereby reducing the effort required to protect slope soil compared to conventional methods.

[0010] A further aspect of the present invention provides a soil erosion prevention mat according to the above aspect, characterized in that the flow-reducing material comprises a bag and a filler material containing granular material having a particle size or diameter of at least 10 mm filled into the bag. The flow-reducing material can be easily prepared by filling the bag with the filler material. Furthermore, by using granular material having a particle size or diameter of 10 mm or less, the filler material densely fills gaps within the bag and can move relatively freely within the bag, allowing the outer shape of the flow-reducing material to be easily modified to suit the installation environment.

[0011] A soil erosion prevention mat according to a further aspect of the present invention is characterized in that the flow velocity reduction material comprises a bag and a filler material containing at least wood chips, which is filled into the bag. The flow velocity reduction material can be easily prepared by filling the bag with wood chips, and is relatively lighter than logs, making it easier to install.

[0012] A further embodiment of the soil erosion prevention mat of the present invention is characterized in that, in the soil erosion prevention mat of the above embodiment, the flow velocity reduction material is raised vertically from the surface of the mat body to a height of 5 to 13 cm. In other words, by attaching the flow velocity reduction material to the surface of the mat body, a dam of appropriate height is formed on the surface of the slope soil, making it possible to effectively reduce the flow velocity of surface water without impeding workability.

[0013] A further aspect of the present invention provides a soil erosion prevention mat according to the above aspect, characterized in that the connecting portions between the flow-reducing material and the surface of the mat body are formed in a straight line or at points in the longitudinal direction of the flow-reducing material. In other words, by forming the connecting portion between the flow-reducing material and the surface of the mat body at a single point in the vertical width direction, when a force is applied to the flow-reducing material in the vertical direction of the mat body, the flow-reducing material can move freely in the vertical direction with the connecting portion as a fulcrum, thereby preventing the mat body from being pulled by the flow-reducing material and lifting off the soil surface or tearing.

[0014] A further embodiment of the soil erosion prevention mat of the present invention is characterized in that, in the soil erosion prevention mat of the above embodiment, the flow velocity reduction material has a strip-shaped connecting strip extending from the bag in a width direction perpendicular to the longitudinal direction of the flow velocity reduction material, and the connecting strip is connected to the surface of the mat body using a surface extending parallel to the surface of the mat body as a connecting portion. In other words, by connecting the surface of the strip-shaped connecting strip extending from the bag to the surface of the mat body as a connecting portion, the flow velocity reduction material can be more firmly connected to the surface of the mat body. Furthermore, because the bag is connected to the surface of the mat body via the connecting strip, when a force is applied to the flow velocity reduction material in the vertical direction of the mat body, the flow velocity reduction material can move freely in the vertical direction relative to the connecting strip, thereby preventing the mat body from being pulled by the flow velocity reduction material and lifting off the soil surface or tearing the mat body.

[0015] A further aspect of the present invention provides a soil erosion prevention mat according to the above aspect, characterized in that the flow-reducing material has a flexible deformation portion at at least one longitudinal end that overlaps the main body of the mat by a first length and protrudes from the lateral edge of the main body of the mat by a second length, and is flexible enough to be separated from the surface of the main body of the mat. In other words, the end of the flow-reducing material can be deformed via the flexible deformation portion so that it lifts off the surface of the main body at the edge of the main body of the mat. This allows multiple soil erosion prevention mats to be placed laterally adjacent to each other, so that adjacent flow-reducing materials can be placed continuously and without interruption in the contour direction of the slope soil, and the edges of adjacent mats can be laid overlapping each other in the contour direction. In particular, by inserting the flow-reducing material of one soil erosion prevention mat between the flexibly deformed flow-reducing material of the other soil erosion prevention mat and the main body of the other soil erosion prevention mat, adjacent flow-reducing materials can be placed at the same level on the slope soil without interfering with each other. Therefore, it is possible to effectively protect slope soil by using multiple soil erosion prevention mats.

[0016] A further aspect of the present invention is a soil erosion prevention mat, characterized in that the main body of the mat is formed from a cotton-like layer of a predetermined thickness. The cotton-like sheet layer of the main body of the mat effectively absorbs the impact of raindrops, and the cotton-like fibers capture soil particles and prevent their movement. Furthermore, the movement of surface water through the cotton-like layer reduces the amount of surface water flowing into the soil, effectively promoting drainage treatment within the mat.

[0017] A soil erosion prevention mat according to a further embodiment of the present invention is the above-described soil erosion prevention mat, further comprising a greening material attached to the mat body. That is, by placing the soil erosion prevention mat on a slope, it is possible to reduce erosion of the slope soil while simultaneously promoting soil greening by plants.

[0018] A slope soil protection structure according to one embodiment of the present invention is a slope soil protection structure in which a plurality of soil erosion prevention mats according to the above embodiment are installed in a protection area of ​​slope soil, The method is characterized in that a plurality of flow velocity reduction materials are arranged continuously and without interruption in the contour direction of the slope soil, and a plurality of mat bodies cover the soil surface of the protection area without exposing it.

[0019] A method according to one aspect of the present invention is a method for protecting slope soil to prevent soil erosion by installing a plurality of soil erosion prevention mats according to the above aspect in a protection area of ​​the slope soil, the method comprising: The flow velocity reduction materials of the soil erosion prevention mats that are adjacent in the horizontal direction are arranged so as to be continuous without interruption in the contour line direction of the slope soil, The mats are characterized in that the edges of the mat bodies of adjacent soil erosion prevention mats are arranged so as to overlap each other. [Effects of the Invention]

[0020] The soil erosion prevention mat, slope soil protection structure, and method for protecting slope soil of the present invention have the effect of reducing the flow rate of surface water and reducing sediment runoff, making it possible to protect slope soil more easily and effectively. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic perspective view of a soil erosion prevention mat according to one embodiment of the present invention; [Figure 2] FIG. 2 is a partially enlarged perspective view of the soil erosion prevention mat of FIG. 1. [Figure 3] Cross section AA of the soil erosion control mat in Figure 2. [Figure 4] Exploded view of the soil erosion control mat in Figure 3. [Figure 5] Figure 2 shows a cross section of the soil erosion prevention mat shown in B-B. [Figure 6] 1 is a schematic perspective view of an entire slope soil protection structure according to an embodiment of the present invention; [Figure 7] FIG. 7 is a partially enlarged perspective view of the slope soil protection structure of FIG. 6. [Figure 8] Cross section of the slope soil protection structure in Figure 7. [Figure 9] Longitudinal cross section of the slope soil protection structure in Figure 7. [Figure 10] 1 is a schematic diagram showing a modified example of the soil erosion prevention mat of the present invention. [Figure 11] 10 is a schematic diagram showing a soil erosion prevention mat according to another embodiment of the present invention. FIG. [Figure 12] An enlarged view of the soil erosion prevention mat shown in Figure 11. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the shapes of the drawings referred to in the following description are conceptual or schematic diagrams for explaining preferred shapes and dimensions, and the dimensional ratios do not necessarily correspond to the actual dimensional ratios. In other words, the present invention is not limited to the dimensional ratios in the drawings.

[0023] The soil erosion prevention mat 100 of one embodiment of the present invention is installed on sloping soil such as a slope, thereby covering the soil surface and preventing soil erosion. Although the soil erosion prevention mat 100 of this embodiment is configured to be installed on sloping soil, it goes without saying that it may also be installed on a flat, non-sloped surface. In this specification, the direction along the inclination of the slope when the soil erosion prevention mat 100 is laid on sloping soil is defined as the "vertical" direction, and the direction along the contour lines of the slope is defined as the "horizontal" direction. Furthermore, when the soil erosion prevention mat 100 is laid on sloping soil, the side that is located on the toe of the slope (upper or higher side) is defined as the "upper" position, and the side that is located on the toe of the slope (lower or lower side) is defined as the "lower" position.

[0024] FIG. 1 is a schematic perspective view of a soil erosion prevention mat 100 according to one embodiment of the present invention. FIG. 2 is a partially enlarged perspective view of the soil erosion prevention mat 100. FIG. 3 is an AA cross-sectional view of the soil erosion prevention mat 100. FIG. 4 is an exploded view of the soil erosion prevention mat 100. FIG. 5 is a BB cross-sectional view of the soil erosion prevention mat 100. As shown in FIGS. 1 to 5, the soil erosion prevention mat 100 includes a flexible mat body 101 extending lengthwise and widthwise, with the longitudinal direction aligned with the inclination direction of the slope soil and configured to reduce erosion of the soil surface, and flow velocity reduction materials 110 attached to the surface of the mat body 101 for reducing the flow velocity of water flowing over the surface of the slope soil. In this embodiment, multiple flow velocity reduction materials 110 are attached to a single, longitudinally elongated mat body 101; however, one flow velocity reduction material 110 may be attached to one mat body 101.

[0025] The mat body 101 is a flexible sheet that extends lengthwise and widthwise to cover the protected area of ​​the slope soil and protect the slope soil. The mat body 101 is configured so that, when laid, it can adhere closely to the surface of the slope soil, which has unevenness or undulations, due to its flexibility or pliability. In this embodiment, the mat body 101 is composed of a cotton-like sheet 102 of a predetermined thickness and a mesh sheet 103 attached to the surface side of the cotton-like sheet 102. In this embodiment, the cotton-like sheet 102 is made by molding synthetic resin fibers or natural fibers into a cotton-like shape, preferably to have a thickness of 20 mm or less. More specifically, the thickness of the cotton-like sheet 102 is preferably 3 to 20 mm. Furthermore, the cotton-like sheet 102 of this embodiment preferably has a fiber basis weight of approximately 80 g / m2 so as not to inhibit plant emergence. 2 More specifically, the fiber basis weight was 20 to 80 g / m 2 It is preferable that the cotton-like sheet 102 be made of a material having a thickness of 100 mm or less. The cotton-like sheet 102 effectively absorbs the impact of raindrops during heavy rain, and the cotton-like fibers can capture soil particles and effectively prevent their movement. Furthermore, the cotton-like sheet 102 reduces the amount of surface water that flows into the soil by allowing the surface water to move through the layer of the cotton-like sheet 102, thereby effectively promoting drainage treatment within the soil erosion prevention mat 100. The mesh sheet 103 is formed by weaving synthetic resin fibers or natural fibers vertically and horizontally at a specified mesh size, and reinforces the cotton-like sheet 102 from the surface side.

[0026] The flow velocity reduction materials 110 are attached to the surface of the mat body 101 to reduce the velocity of water (surface water) flowing over the surface of the slope soil. The flow velocity reduction materials 110 are formed in a long cylindrical shape extending across the entire width of the mat body 101 and are configured to form a weir with a predetermined height vertically from the surface of the mat body 101. In this embodiment, multiple flow velocity reduction materials 110 are arranged at intervals in the vertical direction on one mat body 101. This interval is preferably approximately 0.5 to 5 m. The longitudinal length of each flow velocity reduction material 110 is greater than the width of the mat body 101. In other words, the flow velocity reduction materials 110 extend so as to protrude from both lateral edges of the mat body 101. To function as a weir, the flow velocity reduction materials 110 preferably protrude vertically from the surface of the mat body 101 by a height of 5 to 13 cm. More specifically, the flow velocity reduction material 110 of this embodiment preferably has a circular or oval shape with a circumference of approximately 25 to 40 cm in the cross-sectional view shown in Fig. 3. If the flow velocity reduction material 110 is smaller than the above-mentioned size, the flow velocity reduction effect will be reduced, and conversely, if it is larger than the above-mentioned size, workability will be poor.

[0027] As shown in Fig. 3, the flow velocity reduction material 110 comprises a bag 111, a filler 112 filled in the bag 111, and a connecting portion 114 having a connecting portion 115 between the flow velocity reduction material 110 and the surface of the mat main body 101. Furthermore, unlike logs and the like, the flow velocity reduction material 110 can change its outer shape to some extent by moving the filler 112 inside the bag 111. In other words, the flow velocity reduction material 110 can change its shape to fit the unevenness and undulations of the slope soil on which it is installed.

[0028] The bag body 111 is composed of a long, tubular nonwoven bag and a resin net covering the nonwoven bag. This resin net is integrally molded from a flexible and elastic synthetic resin. Because this resin net is formed as a so-called "non-woven net" integrally molded from synthetic resin, it is stronger and more durable than nets formed by weaving wires.

[0029] The filler 112 is configured to include at least wood chips. Wood chips are easily and economically available by crushing thinned wood or waste wood. In this embodiment, the filler 112 is composed solely of wood chips. Wood chips generally have random shapes, but are preferably granular (small pieces, fragments) having a particle size or diameter of approximately 10 mm or less. However, the filler 112 may also include granular materials such as soil, soil conditioner, crushed urethane, waste paper, resin pieces, and gravel in addition to wood chips. Alternatively, the filler 112 may include granular materials such as crushed urethane, waste paper, resin pieces, and gravel instead of wood chips. In other words, the filler 112 can be selected from materials capable of reducing the flow rate. The granular materials preferably have a particle size or diameter of 10 mm or less and are of a material or size that allows them to be stably maintained within the bag 111 without dissolving in water. If the granular material is 10 mm or less, it densely fills the gaps inside the bag body 111 and can move relatively freely inside the bag body 111, making it easy to change the shape of the filler material 112 to suit the installation environment. Furthermore, in addition to granular material having a grain size or particle size of 10 mm or less, the filler material 112 may also contain chunks such as wood chips having a larger grain size or particle size.

[0030] The connecting margins 114 extend in a strip-like shape from the bag body 111 in the width direction perpendicular to the longitudinal direction of the flow velocity reduction material 110. As shown in FIG. 3, the connecting margins 114 are connected to the surface of the mat main body 101 at connecting portions 115, which are surfaces extending parallel to the surface of the mat main body 101. In this embodiment, the connecting margins 114 are formed as binding margins for a resin net. The connecting margins 114 can be freely bent and deformed relative to the bag body 111. As shown in FIG. 4, the connecting margins 114 hanging down from the bag body 111 are bent so as to be parallel to the surface of the mat main body 101, and then one surface of the connecting margins 114 (connecting portion 115) is connected to the surface of the mat main body 101, thereby attaching the flow velocity reduction material 110 to the surface of the mat main body 101. Specifically, the connecting portions 115 are connected to the mat main body 101 in whole or in part using a C-ring, staples, adhesive, or the like. In addition, the connection margin 114 and the connecting portion 115 connect the central region of the flow velocity reduction material 110 in the longitudinal direction to the surface of the mat main body 101, but are configured so as not to connect the end region to the surface of the mat main body 101.

[0031] The flow velocity reduction material 110 includes a flexible deformation portion 116 at its longitudinal end portion. The flexible deformation portion 116 overlaps the mat main body 101 by a first length and protrudes from the lateral edge of the mat main body 101 by a second length. The flexible deformation portion 116 is flexible and deformable so as to separate from the surface of the mat main body 101. In FIG. 5 , the portion of the flexible deformation portion 116 that overlaps with the mat main body 101 is indicated as overlapping portion 116a, and the portion of the flexible deformation portion 116 that protrudes from the lateral edge of the mat main body 101 is indicated as protruding portion 116b. As shown by the imaginary line in FIG. 5 , the flexible deformation portion 116 is deformable so as to rise from the mat main body 101 with a connecting portion 115 on the inner lateral side as a fixed end, forming a gap between the flexible deformation portion 116 and the surface of the mat main body 101. Preferably, the length of the flexible deformation portion 116 (the sum of the first length and the second length) is set to 20 to 40 cm. The first length (overlapping length) is greater than the second length (protruding length).

[0032] That is, the end of the flow velocity reduction material 110 can be deformed via the flexible deformation portion 116 so as to lift off the surface of the mat main body 101 near the edge of the mat main body 101. As a result, when multiple soil erosion prevention mats 100 are arranged adjacent to each other in the horizontal direction (as will be described later with reference to Figures 7 and 8), adjacent flow velocity reduction materials 110, 110 can be arranged continuously and without interruption in the contour direction of the slope soil, and the edges of adjacent mat main bodies 101, 101 can be laid so that they overlap in the contour direction. In particular, by inserting the flow velocity reduction material 110 of one soil erosion prevention mat 100 between the flexibly deformed flow velocity reduction material 110 and the mat main body 101 of the other soil erosion prevention mat 100, adjacent flow velocity reduction materials 110, 110 can be arranged at the same level on the slope soil without interfering with each other.

[0033] Next, with reference to Figures 6 to 9, a slope soil protection structure 10 in which a plurality of soil erosion prevention mats 100 of this embodiment are installed in a predetermined protection area of ​​slope soil G will be described. Figures 6 and 7 are schematic perspective views of the slope soil protection structure 10. Figures 8 and 9 are cross-sectional and longitudinal sectional views of the slope soil protection structure 10.

[0034] In the slope soil protection structure 10 of this embodiment, as shown in Figure 6, multiple soil erosion prevention mats 100 are installed on slope soil G with the longitudinal direction of each soil erosion prevention mat 100 aligned with the inclination direction of the slope soil G. Each soil erosion prevention mat 100 is fixed to the slope soil G by multiple anchor pins 107, 108. The anchor pins 107, 108 are driven in so as to penetrate the flow velocity reduction material 110 and the mat main body 101. The first anchor pin 107 is located inside (at the base end) of the flexible deformation portion 116 of the flow velocity reduction material 110, and can also serve as a connecting portion connecting the flow velocity reduction material 110 and the mat main body 101. On the other hand, the second anchor pin 108 is driven into the overlapping points of adjacent soil erosion prevention mats 100, 100 (i.e., the mat bodies 101, 101 and the flow velocity reduction materials 110, 110), and functions to strengthen the connection between adjacent soil erosion prevention mats 100, 100.

[0035] Furthermore, in the slope soil protection structure 10 of this embodiment, adjacent soil erosion prevention mats 100 are laid so that the edges of the mat bodies 101 overlap each other, thereby covering the slope soil G and preventing it from being exposed. In other words, the multiple mat bodies 101 cover the slope soil G without interruption, thereby achieving a sediment runoff reduction effect over the entire protected area of ​​the slope soil G. Furthermore, in soil erosion prevention mats 100 adjacent in the contour direction, multiple flow velocity reduction materials 110 are arranged continuously in the contour direction of the slope soil G. In other words, the multiple flow velocity reduction materials 110 are arranged without interruption in the contour direction, thereby achieving a flow velocity reduction effect over the entire protected area of ​​the slope soil G.

[0036] As shown in Figures 7 and 8, horizontally adjacent flow velocity reduction materials 110, 110 overlap each other horizontally and are arranged continuously on the same level contour line. More specifically, when adjacent mat bodies 101, 101 overlap, one flow velocity reduction material 110 deforms to float upward, and the other flow velocity reduction material 110 is inserted into the gap between the first flow velocity reduction material 110 and the mat body 101. The flow velocity reduction material 110 can deform using the connecting portion 115 or the first anchor pin 107 as a fixed end or fulcrum. Furthermore, because the length of the overlapping portion 116a of the flexible deformation portion 116 is longer than the length of the protruding portion 116b, a sufficient overlap width between the mat bodies 101, 101 is ensured. Furthermore, one flow velocity reduction material 110 is stacked on top of the other flow velocity reduction material 110, forming a weir that is continuous in the contour line direction. At this time, in the adjacent flow reduction materials 110, 110, the filler 112 moves and deforms inside the bag body 111, which prevents the flow reduction materials 110, 110 from overlapping like sandbags and forming large gaps between the flow reduction materials 110, 110. Furthermore, the second anchor pin 108 as a fixing member is finally driven into the slope soil G through the overlapping parts of the flow reduction materials 110, 110 and the mat bodies 101, 101, thereby stably maintaining the shape of the slope soil protection structure 10.

[0037] As shown in FIG. 9 , the cotton-like sheet 102 of the mat body 101 adheres closely to the surface of the slope soil G to protect the soil, and the flow velocity reduction material 110 attached to the surface of the mat body 101 forms a dam with a predetermined height perpendicular to the surface of the mat body 101. In FIG. 9 , arrows indicate surface water flowing on the slope soil G. As shown in FIG. 9 , when surface water is generated due to heavy rain or the like, the flow velocity reduction material 110 functions to dam the water upward in the direction of the slope. The flow velocity reduction material 110 prevents the surface water from passing through at its original flow rate. That is, some of the surface water passes through the flow velocity reduction material 110, and some of the surface water accumulates on the upper side of the flow velocity reduction material 110 in the direction of the slope, overflows the top of the flow velocity reduction material 110, and flows downward in the direction of the slope. Furthermore, some of the surface water is also drained by the cotton-like sheet 102 of the mat body 101. In this way, the surface water is dispersed by the flow velocity reduction material 110 and the cotton-like sheet 102, and the flow velocity thereof is effectively reduced.

[0038] 9, the flow velocity reduction material 110 is connected to the mat main body 101 via the connecting portions 115 of the connecting margins 114, and the bag body 111 is movable relative to the connecting margins 114. In other words, even if a force is applied to the flow velocity reduction material 110 and it moves, the bag body 111 tilts or moves relative to the connecting margins 114, thereby preventing a pulling force from being directly applied to the mat main body 101. This effectively prevents the mat main body 101 from lifting up from the surface of the slope soil G or from breaking.

[0039] In this embodiment, the slope soil G is shown as an ideal slope with a single gradient, but it goes without saying that multiple soil erosion prevention mats 100 may be applied to natural terrain with complex gradients. In such cases, the flow velocity reduction materials 110 of adjacent soil erosion prevention mats 100 may be arranged so that they are bent in a V shape or so that they intersect, thereby preventing adjacent flow velocity reduction materials 110 from being disconnected.

[0040] Next, we will explain how to construct the slope soil protection structure 10 by installing multiple soil erosion prevention mats 100 in a specified protected area of ​​slope soil G. First, a predetermined number of soil erosion prevention mats 100 are prepared to fit the area of ​​the specified protected area. The multiple soil erosion prevention mats 100 are installed on the slope soil G so that their longitudinal direction follows the inclination direction of the slope soil G. The flow velocity reduction materials 110 of horizontally adjacent soil erosion prevention mats 100 are aligned so that they are continuous at the same level in the contour line direction of the slope soil G without interruption, and the edges of the mat bodies 101 of horizontally and vertically adjacent soil erosion prevention mats 100 are aligned so that they overlap. Then, anchor pins 107 and 108 are driven in to secure each soil erosion prevention mat 100 to the slope soil G. In other words, according to this method, by aligning and placing multiple soil erosion prevention mats 100 on the slope soil G, it is possible to construct a slope soil protection structure 10 that has the effect of reducing the flow rate of surface water and reducing soil runoff, making it possible to protect the slope soil G more easily and efficiently than conventional log reinforcement construction methods.

[0041] Based on the above, the effects of the soil erosion prevention mat 100 according to one embodiment of the present invention will be described.

[0042] The soil erosion prevention mat 100 of this embodiment can reduce sediment runoff by covering the slope soil G with the flexible mat body 101. Furthermore, a cylindrical flow velocity reduction material 110 extending across the entire width of the mat body 101 is attached to the surface of the mat body 101, forming a weir with a predetermined height vertically from the surface of the mat body 101. This also reduces the flow velocity of surface water without creating any discontinuities in the mat body 101. Therefore, the soil erosion prevention mat 100 of this embodiment can seamlessly cover the protected area of ​​the slope soil G while reducing the flow velocity of surface water. Furthermore, by attaching the flow velocity reduction material 110 to the surface of the mat body 101, the soil erosion prevention mat 100 of this embodiment can reduce the flow velocity of surface water similar to that of log reinforcement work, thereby reducing the effort required to protect the slope soil G compared to conventional methods.

[0043] [Variations] The present invention is not limited to the above-described embodiment, and various modifications are possible. Modifications of the present invention will be described below. In each modification, components designated by three digits that share the same last two digits have the same or similar characteristics unless otherwise specified, and their description will be omitted.

[0044] (1) The soil erosion prevention mat of the present invention is not limited to the above-described embodiment and can take various forms. In the above-described embodiment, the flow velocity reduction material is attached to the surface of the mat body using the backside of the connecting portion as a connecting portion. However, the present invention is not limited to this. FIGS. 10(a) and 10(b) show modified soil erosion prevention mats 200 and 300. In the soil erosion prevention mat 200 shown in FIG. 10(a), the connecting portion is omitted, and the connecting portion 215 between the flow velocity reduction material 210 and the surface of the mat body 201 is formed in a straight line in the longitudinal direction of the flow velocity reduction material 210. This connecting portion 215 may be formed by adhesive, heat fusion, or other means. In the soil erosion prevention mat 300 shown in FIG. 10(b), the connecting portion 315 between the flow velocity reduction material 310 and the surface of the mat body 301 is formed in a dotted pattern in the longitudinal direction of the flow velocity reduction material 210. The connecting portion 315 may be a C-ring, staple, adhesive, or an anchor pin that penetrates the mat body 301 and the flow velocity reduction material 310 and is driven into the ground.

[0045] In the soil erosion prevention mats 200, 300 shown in Figures 10(a) and (b), the connection parts 215, 315 between the flow velocity reduction material 210, 310 and the mat main body 201, 301 are located at one point in the vertical width direction. This allows the flow velocity reduction material 210, 310 to move freely in the vertical direction with the connection parts 215, 315 as fulcrums when a vertical force is applied to the flow velocity reduction material 210, 310, thereby preventing the mat main body 201, 301 from being pulled by the flow velocity reduction material 210, 310 and lifting off the soil surface or tearing the mat main body 201, 301.

[0046] (2) The soil erosion prevention mat of the present invention is not limited to the above embodiment and can take various forms. The soil erosion prevention mat of the present invention may be configured to further include a greening material attached to the mat body. FIG. 11 shows a soil erosion prevention mat 400 including a vegetation bag 421 and a seed-bearing sheet 422 as greening materials. The soil erosion prevention mat 400 includes a flexible mat body 401 configured to reduce soil surface erosion, and a plurality of flow velocity reduction materials 410 attached to the surface of the mat body 401 to reduce the flow velocity of water flowing over the surface of the sloping soil. In this embodiment, the mat body 401 is configured to accommodate the vegetation bag 421 and the seed-bearing sheet 422.

[0047] Specifically, the mat body 401 includes a cotton-like sheet 402 of a predetermined thickness, a mesh sheet 403 attached to the front side of the cotton-like sheet 402, and a seed-bearing sheet 422 attached to the back side of the cotton-like sheet 402. As shown in FIG. 12 , the mesh sheet 403 has multiple double-layered mesh sections, each of which has multiple storage sections 403a extending horizontally like a long tube. Each storage section 403a is composed of a mesh-like long tube and is configured to hold a vegetation bag 421 containing greening material. The greening material is a vegetative material used for greening and includes at least one of seeds, fertilizer, soil conditioner, water-retaining material, water-repellent inhibitor, soil, and growth base material. Each storage section 403a extends longitudinally across the width of the mat body 401. The seed-bearing sheet 422 is a nonwoven fabric sheet with plant seeds scattered on its surface. That is, by placing the soil erosion prevention mat 400 on the slope soil, it is possible to reduce the erosion of the slope soil while simultaneously promoting the greening of the soil by plants.

[0048] (3) The soil erosion prevention mat of the present invention is not limited to the above-described embodiment and may take various forms. In the above-described embodiment, the mat body is formed by laminating a mesh sheet on a cotton-like sheet of a predetermined thickness. However, any material that has the effect of reducing soil erosion may be selected. For example, the mat body may be formed only from a cotton-like sheet of a predetermined thickness. Alternatively, the mat body may be made of a relatively thick nonwoven fabric or urethane sheet.

[0049] (4) The soil erosion prevention mat of the present invention is not limited to the above embodiment and can take various forms. In the above embodiment, both ends of the flow velocity reduction material are configured to protrude from both edges of the mat body, but the present invention is not limited to this. For example, only one end of the flow velocity reduction material may be configured to protrude from both edges of the mat body. Alternatively, if a single soil erosion prevention mat is used to cover a protected area of ​​slope soil, the end of the flow velocity reduction material may not protrude from the edge of the mat body.

[0050] (5) The soil erosion prevention mat of the present invention is not limited to the above-described embodiment and may take various forms. In the above-described embodiment, the flow velocity reduction material is attached parallel to the lateral direction of the mat body, but the flow velocity reduction material may extend across the entire lateral direction of the mat body, or may extend at an angle to the lateral direction. Furthermore, the flow velocity reduction material does not have to be a single, elongated cylindrical body, but may be composed of an assembly of multiple bags connected laterally.

[0051] The present invention is not limited to the above-described embodiments, but can be embodied in various forms within the technical scope of the present invention. [Explanation of symbols]

[0052] 10 Slope soil protection structure 100 Erosion prevention mat 101 Mat body 102 Cotton-like sheet 103 Mesh Sheet 107 First anchor pin (connection part) 108 Second anchor pin (fixing member) 110 Flow velocity reduction material 111 Bag body 112 Filling material 113 Net material 114 Connection fee 115 Connection section 116 Flexible deformation part 116a Polymerization site 116b Protruding part 421 Vegetation Bag 422 Seed Sheet G Slope soil (protected area)

Claims

1. A soil erosion prevention mat that is installed on slope soil to reduce soil erosion, a flexible mat body extending lengthwise and widthwise, the lengthwise direction of which is arranged along the slope direction of the slope soil, and configured to reduce erosion of the soil surface; and one or more flow velocity reduction materials attached to the surface of the mat body for reducing the flow velocity of water flowing on the surface of the slope soil; The flow velocity reduction material is formed in a long cylindrical shape extending across the entire lateral direction of the mat body, and is configured to form a weir having a predetermined height in a vertical direction from the surface of the mat body, The flow velocity reduction material is A long cylindrical bag body, A filler made of wood chips in the form of granules having a particle size or grain size of 10 mm or less is filled in the bag, The flow velocity reduction material further includes a band-shaped connecting tab extending in a width direction perpendicular to the longitudinal direction of the flow velocity reduction material so as to hang down from the bag body, and the connecting tab is freely bendable and deformable relative to the bag body, and is connected to the surface of the mat body with a surface of the connecting tab extending parallel to the surface of the mat body as a connecting portion, A soil erosion prevention mat, characterized in that the bag body filled with the filler is movable vertically relative to the mat body.

2. A soil erosion prevention mat that is installed on slope soil to reduce soil erosion, a flexible mat body extending lengthwise and widthwise, the lengthwise direction of which is arranged along the slope direction of the slope soil, and configured to reduce erosion of the soil surface; and one or more flow velocity reduction materials attached to the surface of the mat body for reducing the flow velocity of water flowing on the surface of the slope soil; The flow velocity reduction material is formed in a long cylindrical shape extending across the entire lateral direction of the mat body, and is configured to form a weir having a predetermined height in a vertical direction from the surface of the mat body, The flow velocity reduction material is A long cylindrical bag body, A filler filled in the bag; and a band-shaped connecting strip extending in a width direction perpendicular to the longitudinal direction of the flow velocity reduction material so as to hang down from the bag body, wherein the connecting strip is freely bendable and deformable relative to the bag body, and is connected to the surface of the mat body with a surface of the connecting strip extending parallel to the surface of the mat body as a connecting portion; A soil erosion prevention mat, characterized in that the bag body filled with the filler is movable vertically relative to the mat body.

3. A soil erosion prevention mat that is installed on slope soil to reduce soil erosion, a flexible mat body extending lengthwise and widthwise, the lengthwise direction of which is arranged along the slope direction of the slope soil, and configured to reduce erosion of the soil surface; and one or more flow velocity reduction materials attached to the surface of the mat body for reducing the flow velocity of water flowing on the surface of the slope soil; The flow velocity reduction material is formed in a long cylindrical shape extending across the entire lateral direction of the mat body, and is configured to form a weir having a predetermined height in a vertical direction from the surface of the mat body, The flow velocity reduction material is A long cylindrical bag body, A filler filled in the bag; A connecting portion that connects the flow velocity reduction material to the mat body; A soil erosion prevention mat comprising a flexible deformation portion at at least one longitudinal end, which has an overlapping portion that overlaps with the mat body by a first length and a protruding portion that protrudes from the lateral edge of the mat body by a second length, and which is capable of flexibly deforming so as to move away from the surface of the mat body, wherein the flexible deformation portion is capable of deforming so as to rise from the surface of the mat body with the connecting portion as a fixed end and form a gap between it and the surface of the mat body.

4. A soil erosion prevention mat as described in any one of claims 1 to 3, characterized in that the flow velocity reduction material is raised vertically from the surface of the mat body to a height of 5 to 13 cm.

5. The connecting portion between the flow velocity reduction material and the surface of the mat body is formed in a straight line or in a dotted pattern in the longitudinal direction of the flow velocity reduction material, 4. A soil erosion prevention mat according to claim 1, wherein the flow velocity reduction material is movable vertically relative to the mat body with the connecting portion as a fulcrum.

6. A soil erosion prevention mat that is installed on slope soil to reduce soil erosion, a flexible mat body extending lengthwise and widthwise, the lengthwise direction of which is arranged along the slope direction of the slope soil, and configured to reduce erosion of the soil surface; and one or more flow velocity reduction materials attached to the surface of the mat body for reducing the flow velocity of water flowing on the surface of the slope soil; The flow velocity reduction material is formed in a long cylindrical shape extending across the entire lateral direction of the mat body, and is configured to form a weir having a predetermined height in a vertical direction from the surface of the mat body, The flow velocity reduction material is A long cylindrical bag body, A filler made of wood chips in the form of granules having a particle size or grain size of 10 mm or less is filled in the bag, The flow velocity reduction material is A connecting portion that connects the flow velocity reduction material to the mat body; A soil erosion prevention mat further comprising a flexible deformation portion at at least one longitudinal end which has an overlapping portion that overlaps with the mat body by a first length and a protruding portion that protrudes from the lateral edge of the mat body by a second length, and which is capable of being flexibly deformed so as to move away from the surface of the mat body, wherein the flexible deformation portion is capable of being deformed so as to float up from the surface of the mat body with the connecting portion as a fixed end and form a gap between it and the surface of the mat body.

7. 4. The soil erosion prevention mat according to claim 1, wherein the mat body is made up of a cotton sheet and a mesh sheet of a predetermined thickness.

8. 4. The soil erosion prevention mat according to claim 1, further comprising a greening material attached to the mat body.

9. A slope soil protection structure in which a plurality of soil erosion prevention mats according to any one of claims 1 to 3 are installed in a protection area of ​​slope soil, A slope soil protection structure characterized in that a plurality of flow velocity reduction materials are arranged continuously and without interruption in the contour direction of the slope soil, and a plurality of mat bodies cover the soil surface of the protection area without exposing it.

10. A method for protecting slope soil to prevent soil erosion, comprising installing a plurality of soil erosion prevention mats according to any one of claims 1 to 3 in a protected area of ​​the slope soil, The flow velocity reduction materials of the soil erosion prevention mats that are adjacent in the horizontal direction are arranged so as to be continuous without interruption in the contour line direction of the slope soil, A method comprising arranging adjacent soil erosion control mats so that the edges of the mat bodies overlap each other.

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