Slope countermeasure structure

Abstract

To provide a slope countermeasure structure capable of not only improving a landscape by promoting vegetation but also coping with not only a local collapse of a slope but also a surface slide collapse of the slope.SOLUTION: A slope countermeasure structure that stabilizes a slope S1 in response to surface slide collapse and local collapse of the slope S1 comprises anchor materials 1 installed at intervals on the slope S1, a net 2 covering the surface layer of the slope S1, and a band-shaped slope panel 3 (3A, 3B) laid from above the net 2 and clamped and fixed between an upper fixing plate 4A and a lower fixing plate 4B whose crossing points are pressed against the slope S1 by the heads of the anchor members 1.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a slope control structure that is constructed on a slope to stabilize the slope. [Background technology]

[0002] A typical slope prevention structure that is constructed on a slope to stabilize it involves driving multiple anchors into the ground and constructing a concrete crest on the slope. However, this method takes time to construct, is difficult to follow on uneven slopes, and results in a poor appearance, so various technologies that take these issues into consideration have been proposed and are being implemented.

[0003] For example, Patent Document 1 discloses a conventional technique comprising anchor materials installed at intervals on a slope, a sheet covering the surface of the slope, and a strip-shaped slope material laid on top of the sheet with its intersections clamped and fixed between an upper fixing plate and a lower fixing plate.

[0004] Furthermore, Patent Document 2 discloses a conventional technology comprising a mat that is laid directly over the entire target slope and has gaps that allow plants to grow, a wire mesh made of hard steel wire that is laid on the mat, pressure plates that are installed at predetermined intervals on the wire mesh, and a tensioning body that is inserted into and fixed to stable ground in the natural ground and presses the pressure plates installed on the mat toward the slope.

[0005] The conventional technology disclosed in Patent Document 1 is an excellent technology that can prevent surface erosion on slopes, promote vegetation, and prevent small-scale localized slope failures, thereby stabilizing slopes inexpensively and effectively. However, while the conventional technology disclosed in Patent Document 1 can deal with localized slope failures, it is anticipated that there may be cases where it cannot deal with large-scale surface slope failures due to the tensile strength of the sheet.

[0006] The prior art disclosed in Patent Document 2 is a construction method using secondary products made of high-strength netting, which allows for full-surface greening, a beautiful landscape, and is strong enough to withstand loads that may be applied in the event of a surface landslide or localized collapse, such as a collapse due to a hole between anchor materials. However, even with the prior art disclosed in Patent Document 2, the wire mesh is made of hard steel wire, and although it has better conformability than the technology using concrete crests for the typical slopes mentioned above, it still bends when pressed against the slope by the fixing plate and the fastening members of the anchor heads, creating gaps between the mesh and the slope surface. In other words, if the mesh is not tightly attached to the slope, it may not immediately exert its bearing effect against deformation of the ground in the event of a surface landslide, and there is a risk of surface erosion progressing through the gaps that form between the mesh and the slope. Furthermore, the wire used in high-strength nets is hard steel wire with a tensile strength exceeding 1000 MPa, which is prone to bending due to the fastening members at the anchor head, creating gaps between the anchor and the slope. This can prevent the slope work from providing sufficient bearing pressure, which is necessary to prevent surface landslides and collapses, immediately after the slope deformation occurs. Furthermore, high-strength nets made with hard steel wire are often sourced from overseas, which can make them difficult to source or obtain locally. Furthermore, hard steel wire poses problems, such as difficulty in cutting and processing on-site due to its high strength, especially when it is necessary to avoid trees remaining on the slope. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2017-186738 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-117124 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention was devised in consideration of the above-mentioned problems, and its purpose is to provide a slope control structure that not only improves the landscape by promoting vegetation, but also can respond to not only localized slope failures but also surface slide failures on slopes. [Means for solving the problem]

[0009] The slope countermeasure structure according to the first invention is a slope countermeasure structure for stabilizing a slope in response to a surface slide or localized collapse of the slope, and comprises anchor materials installed at intervals on the slope, a net covering the surface of the slope, and strip-shaped slope materials laid on top of the net, wherein the strip-shaped slope materials are laid as a plurality of vertical strip-shaped slope materials extending in the up-down direction of the slope and a plurality of horizontal strip-shaped slope materials extending in a direction intersecting with the vertical strip-shaped slope materials, and the heads of the anchor materials exposed above ground penetrate the intersections of the vertical and horizontal strip-shaped slope materials. The head of the anchor material that penetrates both of the strip-shaped slope materials has an upper fixing plate and a lower fixing plate that are arranged above the net so as to sandwich the overlapping surface of the intersection of both of the strip-shaped slope materials from above and below, and the upper fixing plate and the lower fixing plate are pressed against the slope by a tightening member attached to the head of the anchor while sandwiching and fixing both of the strip-shaped slope materials together, and the net is a wire mesh with a wire tensile strength of 290 to 540 MPa and a mesh size of 20 to 50 mm x 20 to 50 mm.

[0010] The slope countermeasure structure according to the second invention is the structure according to the first invention, characterized in that a vegetation sheet is interposed between the net and the slope so as to cover the slope.

[0011] The slope countermeasure structure according to the third invention is characterized in that, in the first or second invention, the lower part of the anchor material is installed at a depth of 1.0 to 6.0 m in the ground below the slope. [Effects of the Invention]

[0012] The slope countermeasure structure of the first invention uses a net with lower wire tensile strength and higher flexibility than high-strength nets made with hard steel wires. This allows for better conformability to slope irregularities, reduces the risk of gaps between the net and the ground, and effectively prevents surface erosion. Furthermore, the slope countermeasure structure of the first invention further improves adhesion to the ground by installing strip-shaped slope protection materials over the net. This facilitates the provision of a bearing effect to suppress slope deformation in the event of a collapse. The load acting upon the slope deformation can be shared between the net and the strip-shaped slope protection materials, enabling the structure to address not only localized slope collapses but also surface landslides. Furthermore, the slope countermeasure structure of the first invention uses a wire mesh with a wire tensile strength of 290 to 540 MPa, allowing the use of nets conforming to JIS standards. This allows for easy procurement of materials and easy on-site arrangement, resulting in relatively low construction costs. Furthermore, the slope countermeasure structure of the first invention also allows for easier on-site cutting and processing compared to high-strength nets. Furthermore, according to the slope control structure of the first invention, the mesh size of the net is 20 to 50 mm x 20 to 50 mm, which makes it easy for plants to grow through the mesh when greening the slope, and also minimizes the leakage of soil and sand when preventing the slope from collapsing.

[0013] According to the slope countermeasure structure of the second invention, a vegetation sheet is interposed between the net and the slope so as to cover the slope, which promotes vegetation on the slope. Furthermore, according to the slope countermeasure structure of the second invention, the vegetation grows and covers the slope, which further enhances the effect of preventing surface erosion.

[0014] According to the slope prevention structure of the third invention, the anchor materials are installed in the ground at a depth of 1.0 to 6.0 m, and reach a stable ground layer deeper than the expected intra-ground slide boundary, making it less likely that a surface slide collapse will occur, and a higher deterrent effect can be expected. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a plan view showing a structure for preventing slope damage according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 3 is a partially enlarged view of the periphery of the anchor material in FIG. [Figure 4] FIG. 4 is a partially enlarged view showing the area around the intersection of the band-shaped slope materials in FIG. 1, with anchor materials and the like omitted. [Figure 5] FIG. 5(a) is a plan view of an upper fixing plate used in the slope countermeasure structure according to the first embodiment of the present invention, and FIG. 5(b) is a side view of FIG. 5(a). [Figure 6] FIG. 6(a) is a plan view of a lower fixing plate used in the slope countermeasure structure according to the first embodiment of the present invention, and FIG. 6(b) is a side view of FIG. 6(a). [Figure 7] FIG. 7 is a partially enlarged view showing a main part of the vertical band-shaped slope material in FIG. [Figure 8] FIG. 8 is a cross-sectional view illustrating the types of slopes to which the slope countermeasure structure according to the present invention is applied. [Figure 9] FIG. 9 is a cross-sectional view illustrating the types of slopes to which the slope countermeasure structure according to the present invention is applied. [Figure 10] FIG. 10 is a cross-sectional view illustrating the types of slopes to which the slope countermeasure structure according to the present invention can be applied. [Figure 11] FIG. 11 is an explanatory diagram for explaining the effects when the slope countermeasure structure according to the first embodiment of the present invention is applied to the slope of FIG. [Figure 12] FIG. 12 is a plan view showing a structure for countermeasures against a slope according to the second embodiment of the present invention. [Figure 13] FIG. 13 is a cross-sectional view taken along the line BB in FIG. [Figure 14] FIG. 14 is a partially enlarged view of the periphery of the anchor material in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

[0017] [Embodiment 1] First, a slope countermeasure structure according to a first embodiment of the present invention will be described.

[0018] FIG. 1 is a plan view showing a slope countermeasure structure according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a partially enlarged view of the periphery of anchor materials in FIG. 2. FIG. 4 is a partially enlarged view of the periphery of the intersection of band-shaped slope materials in FIG. 1, with the anchor materials and other components omitted. FIG. 5(a) is a plan view of an upper fixing plate used in the slope countermeasure structure according to the first embodiment of the present invention, and FIG. 5(b) is a side view of FIG. 5(a). FIG. 6(a) is a plan view of a lower fixing plate used in the slope countermeasure structure according to the first embodiment of the present invention, and FIG. 6(b) is a side view of FIG. 6(a). FIG. 7 is a partially enlarged view showing a main part of the vertical band-shaped slope material in FIG. 1. FIGS. 8 to 10 are cross-sectional views illustrating examples of slopes to which the slope countermeasure structure according to the present invention can be applied. FIG. 11 is an explanatory view for explaining the effects of applying the slope countermeasure structure according to the first embodiment of the present invention to the slope shown in FIG. 10.

[0019] As shown in Figures 8 to 10, the slope control structure of the present invention is a slope control structure that stabilizes slope S1 by responding not only to surface erosion and local collapses such as those on slopes S1-1 and S1-2, but also to surface slide collapses such as those on slope S1-3.

[0020] The types of slopes S1-1, S1-2, and S1-3 to which the slope countermeasure structure according to the present invention is applied will be described in detail below.

[0021] Figure 8 shows surface erosion of slope S1-1. Specifically, it shows that when rainwater seeps into slope S1-1 due to rainfall, the surface portion G2 of slope S1-1 may be eroded and collapse. Note that the gradient θ of slope S1-1 is assumed to be up to about 60°.

[0022] Figure 9 shows the potential for local collapse on slope S1-2 and in the middle of the slope. Specifically, it shows that, similar to surface erosion, erosion by rainwater on slope S1-2 could cause local collapse in the ground section G3 with width W1 and depth D1, particularly in the middle of the slope. Here, width W1 is assumed to be up to about 2m and depth D1 to about 1m. The gradient θ of slope S1-2 is assumed to be up to about 60°.

[0023] Figure 10 shows slope S1-3, which has the potential for a surface slide collapse. Specifically, within the ground of slope S1-3, there is a stable ground layer G1, known as an immovable ground mass, and a moving layer G4, which may become loose due to rainfall or other factors and cause a slide collapse. A surface slide collapse occurs when the sliding force acting in the direction F1 due to the weight of the soil mass in moving layer G4 exceeds the sliding resistance force that resists the slide collapse due to friction and adhesion between the ground. The scale of a surface slide collapse is expected to be up to a width W2 of approximately 30 m and a depth D2 of approximately 3 m.

[0024] 1 to 3, the slope countermeasure structure according to this embodiment 1 comprises anchor materials 1 installed at intervals on slope S1, a net 2 covering the surface of slope S1 which has a lower wire tensile strength than a high-strength net made of hard steel wire and is highly flexible, and strip-shaped slope countermeasure materials 3 (3A, 3B) laid on top of the net 2. That is, the slope countermeasure structure according to this embodiment 1 is in a layered state in which the net 2 is laid on slope S1, and further, strip-shaped slope countermeasure materials 3 (3A, 3B) are laid on top of this net 2, with their intersections sandwiched and fixed between upper fixing plate 4A and lower fixing plate 4B.

[0025] The anchor materials 1 are installed on the slope S1 at an interval M of, for example, 2 m both vertically and horizontally. The installation interval M is preferably set to approximately 1 to 3 m. The lower portions of the anchor materials 1 are installed at a depth L1 of 1.0 to 6.0 m in the ground below the slope S1. That is, the anchor materials 1 are installed so as to reach the stable ground layer G1, which is located at a depth exceeding the collapse-prone ground layers G2, G3, and G4 of the slope S1 to be constructed (see Figures 8 to 10). If the overall structural strength is sufficient, some anchor materials 1 may not reach the stable ground layer G1. Furthermore, the arrangement of the anchor materials 1 is not limited to the grid arrangement shown in the figure, and may be implemented in a staggered arrangement, for example.

[0026] The anchor material 1 used here may have a diameter of 25 mm. The diameter of the anchor material 1 is preferably 16 to 51 mm. In this embodiment 1, in order to increase the pull-out force, spacers 7 may be provided around the anchor material 1 in the ground, and an injection material 8 such as grout may be injected, as shown in Fig. 3. Of course, other embodiments may also be used.

[0027] The net 2 is laid on the slope S1 so that the heads of the upper ends of the anchor materials 1 exposed above ground penetrate through it. In this embodiment 1, the net 2 is made of a wire mesh with a wire tensile strength of 200 to 1000 MPa, preferably 290 to 540 MPa, and a mesh size of 50 mm x 50 mm. The mesh size of the net 2 is preferably 20 to 70 mm x 20 to 70 mm. Note that the wire diameter of the net 2 is preferably about 2.0 mm, which is easily available. The mesh shape is not limited to a lattice shape, and may be, for example, a diamond shape. Furthermore, a tortoiseshell wire mesh or a resin net having a similar strength may also be used. In addition, in FIG. 1, the entire area within the dotted line is the net 2, but to make the lower slope S1 easier to see, it is partially surrounded by a two-dot chain line.

[0028] As shown in Figure 7, the strip-shaped slope materials 3 (3A, 3B) are, for example, aramid fiber-inserted polyethylene nets with a width W of 260 mm and mesh size of 28 mm x 50 mm. Of course, other materials may also be used. The strip-shaped slope materials 3 (3A, 3B) suppress the deflection of the net 2, restrain deformation of the slope S1, and suppress the movement of soil and earth masses caused by local collapse.

[0029] Here, the distance between the centers of the vertical strip-shaped slope materials 3A and the horizontal strip-shaped slope materials 3B is 2 m, the same as the installation interval M of the anchor materials 1. It is preferable to set these distances to about 1 to 3 m. The arrangement of the vertical strip-shaped slope materials 3A and the horizontal strip-shaped slope materials 3B is not limited to a lattice arrangement with a square interior as in Embodiment 1, but may be implemented, for example, by arranging them so that they cross diagonally on the net 2, arranging them in a staggered pattern, or arranging them diagonally so that the interior is a diamond shape.

[0030] In addition, the intersection of the vertical strip-shaped slope material 3A and the horizontal strip-shaped slope material 3B is clamped and fixed by a clamping and fixing member 4 consisting of an upper fixing plate 4A shown in Figure 5 and a lower fixing plate 4B shown in Figure 6, as shown in Figure 4, and is pressed against the slope S1 via the net 2.

[0031] Specifically, the upper fixing plate 4A and the lower fixing plate 4B are thin steel plates with a roughly square shape, each 300 mm on a side and 6 mm thick. As shown in Figures 3 to 6, bolts 41 with bolt heads 42 are inserted through bolt holes 422 at the four corners of the lower fixing plate 4B, with washers (not shown) interposed between them, and nuts 43 are screwed onto the bolts 41 protruding from the bolt holes 412 at the four corners of the upper fixing plate 4A, thereby fixing the intersections of the vertical strip-shaped slope material 3A and the horizontal strip-shaped slope material 3B.

[0032] Then, the head of the upper end of the anchor material 1 protruding from the inclined surface S1 is inserted into the insertion hole 421 in the center of the lower fixing plate 4B, the washer 5 is fitted into the fitting hole 411 in the center of the upper fixing plate 4A, and the nut 6 is screwed in via the spherical washer 60.

[0033] Although not shown in the figures, if there is a depression in the slope S1, the strip-shaped slope material 3 (3A, 3B) between the anchor materials 1 can be fixed to the slope S1 with one or more fixing pins, allowing it to conform to the unevenness of the slope S1. Similarly, the net 2 surrounded by the strip-shaped slope material 3 (3A, 3B) can also be fixed by fixing pins, allowing it to conform to the unevenness of the slope S1.

[0034] The elongated holes 413 in the upper fixing plate 4A and the elongated holes 423 in the lower fixing plate 4B are intended to facilitate transportation by inserting fingers into the ends and gripping them. The anchor materials 1 and other components are omitted in FIG. 4 to make the relationship between the upper fixing plate 4A and the lower fixing plate 4B easier to understand. The lower fixing plate 4B and the insertion holes 421 are shown in solid lines in FIG. 4 because they appear due to the mesh size of the overlapping strip-shaped slope materials 3A, 3B at the intersection. The insertion holes 421 in the lower fixing plate 4B can be used to match the size of the fitting hole 411 in the center of the upper fixing plate 4A. The diameter of the insertion holes 421 can be changed to correspond to the diameter of the anchor materials 1. Alternatively, the holes 411 may be used as insertion holes for the anchor materials 1, and the diameter of the holes 421 may be larger than the diameter of the holes 411.

[0035] According to the slope countermeasure structure of the first embodiment of the present invention described above, the net 2 has a lower wire tensile strength and is more flexible than a high-strength net made of hard steel wire. This allows the net 2 to conform well to the unevenness of the slope S1, reducing the likelihood of gaps forming between the net and the ground, and effectively preventing surface erosion. Furthermore, according to the slope countermeasure structure of the first embodiment, the installation of strip-shaped slope materials 3 (3A, 3B) on top of the net 2 further improves adhesion to the ground. This makes it easier to obtain a bearing effect that suppresses deformation of the slope S1 in the event of a collapse. The load acting when deformation occurs can be shared between the net and the strip-shaped slope materials, making it possible to deal not only with surface erosion and local collapse of the slope S1, but also with surface slide collapse of the slope S1.

[0036] More specifically, as shown in Figure 11, when the slope countermeasure structure according to embodiment 1 of the present invention is applied to the slope of Figure 10, in addition to the retaining force of the anchor material 1, a resistance force F2 acts against the sliding force F1 due to the bearing effect on the slope S1-3 by the net 2 pressed by the head of the tip of the anchor material 1 and the band-shaped slope material 3 (3A, 3B), and at the boundary between the stable ground layer G1 and the mobile layer G4 which may become a moving soil mass, a sliding resistance force F3 due to friction between the ground layers acts, and the interaction of these resistance forces can suppress surface slide collapse.

[0037] Of course, in the slope countermeasure structure according to this embodiment 1, even if a net 2 that is not high in strength and has a lower wire tensile strength than a net made of hard steel wires is used, the load acting when deformation of the slope occurs can be shared by using the net 2, the band-shaped slope facing materials 3 (3A, 3B), the fixing plates 4A, 4B, and the anchor materials 1 installed on top of the net 2, and therefore it is possible to deal with surface erosion and local collapse shown in Figures 8 and 9. Surface erosion is broadly classified as local collapse.

[0038] Furthermore, in the slope countermeasure structure according to this embodiment 1, the net 2 is a wire mesh with a wire tensile strength of 290 to 540 MPa. This allows the use of nets conforming to JIS standards, making the materials readily available and easy to arrange on-site, resulting in relatively low construction costs. Furthermore, the slope countermeasure structure according to this embodiment 1 also allows for easier on-site cutting and processing than high-strength nets. Furthermore, in the slope countermeasure structure according to this embodiment 1, the net 2 is flexible and therefore conforms very well to the unevenness of the slope S1. This allows for the entire slope S1 to be greened, contributing to improved scenery by promoting vegetation. Furthermore, the slope countermeasure structure according to this embodiment 1 is easily obtainable, making it suitable for slope countermeasures requiring rapid response, such as disaster recovery. Furthermore, in the slope countermeasure structure according to this embodiment 1, installing the strip-shaped slope materials 3 (3A, 3B) on top of the net 2 further improves conformability, reduces gaps between the net 2 and the slope S1, and enhances the effectiveness of preventing surface erosion. Moreover, according to the slope countermeasure structure of this embodiment 1, it is easy to obtain a bearing effect due to the high adhesion of the net 2. Furthermore, according to the slope countermeasure structure of this embodiment 1, the ease of construction is good, so the number of days for construction can be reduced.

[0039] Furthermore, according to the slope countermeasure structure of this embodiment 1, the mesh size of the net 2 is 20 to 70 mm x 20 to 70 mm, so that when greening the slope S1, plants can easily grow through the mesh, and the leakage of soil and sand can be minimized when preventing the collapse of the slope S1.

[0040] Furthermore, according to the slope countermeasure structure of this embodiment 1, the strip-shaped slope materials 3 (3A, 3B) between the anchor materials 1 and the net 2 are fixed to the slope by one or more fixing pins, so that the degree of adhesion between the net 2 and the slope S1 can be further increased.

[0041] Furthermore, according to the slope countermeasure structure of this embodiment 1, the anchor material 1 is installed in the ground to a depth L1 of 1.0 to 6.0 m. It penetrates not only the surface layer G2 of the slope S1 (S1-1, S1-2) that is subject to surface erosion and the ground portion G3 that is subject to local collapse, but also the moving layer G4 of the slope S1 (S1-3) where a surface slide collapse may occur, and is inserted until it reaches the stable ground layer G1. By inserting the anchor material 1 so that its anchor length in the stable ground layer G1 is long, the anchor material 1 becomes less likely to be pulled out when the ground begins to deform due to a surface slide collapse, and this is expected to have the effect of further preventing the moving layer G4 from sliding out. It is preferable that the anchor material 1 be inserted into the stable ground layer G1 to have an anchor length of approximately 1 m or more.

[0042] [Embodiment 2] Next, a slope countermeasure structure according to a second embodiment of the present invention will be described.

[0043] Fig. 12 is a plan view showing a slope countermeasure structure according to a second embodiment of the present invention. Fig. 13 is a cross-sectional view taken along line BB in Fig. 12. Fig. 14 is a partially enlarged view of the periphery of the anchor material in Fig. 13.

[0044] The difference between the slope countermeasure structure of this embodiment 2 and the slope countermeasure structure of the above-mentioned embodiment 1 is that a vegetation sheet 20 is interposed between the net 2 and the slope S1 so as to cover the slope S1, so this point will be mainly explained, and the same components will be given the same symbols and explanations will be omitted.

[0045] As shown in FIGS. 12 to 14, the slope countermeasure structure according to the second embodiment has a vegetation sheet 20 interposed between a net 2 and a slope S1 so as to cover the slope S1.

[0046] The vegetation sheet 20 may be, for example, a commercially available vegetation sheet or vegetation mat provided with vegetation seeds.

[0047] Therefore, according to the slope countermeasure structure of the second embodiment of the present invention, the vegetation sheet 20 is interposed between the net 2 and the slope S1 so as to cover the slope S1, thereby promoting greening of the slope. Furthermore, according to the slope countermeasure structure of the second embodiment, the vegetation grows and covers the slope, further improving the effect of preventing surface erosion.

[0048] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0049] 1 Anchor material 2. Net 20 Vegetation Sheet 3 Strip slope material 3A Vertical strip slope material 3B Horizontal strip slope material 4A Upper fixing plate 4B Lower fixing plate 41 Bolt (fastening member) 43 Nut (fastening member) 6 Nut (fastening member) S1 Slope S1-1 Slope S1-2 Slope S1-3 Slope

Claims

1. A slope countermeasure structure that stabilizes a slope in response to a surface slide or localized collapse of the slope, Anchor materials installed at intervals on the slope; A net covering the surface of the slope; A strip-shaped slope material laid on top of the net, The strip-shaped slope material is laid in such a manner that a plurality of vertical strip-shaped slope materials extending in the vertical direction of the slope and a plurality of horizontal strip-shaped slope materials extending in a direction intersecting with the vertical strip-shaped slope materials are laid, and the heads of the anchor materials exposed above ground penetrate the intersections of the vertical and horizontal strip-shaped slope materials, The head of the anchor material penetrating both of the strip-shaped slope materials has an upper fixing plate and a lower fixing plate arranged above the net so as to sandwich the overlapping surface of the intersection of both of the strip-shaped slope materials from above and below, and the upper fixing plate and the lower fixing plate are pressed against the slope by a tightening member attached to the head of the anchor while clamping and fixing both of the strip-shaped slope materials together, The net is a wire mesh having a wire tensile strength of 290 to 540 MPa, The mesh size of the net is 20 to 50 mm x 20 to 50 mm. A slope prevention structure characterized by the above.

2. A vegetation sheet is interposed between the net and the slope so as to cover the slope.

2. The slope countermeasure structure according to claim 1,

3. The lower part of the anchor material is installed at a depth of 1.0 to 6.0 m in the ground below the slope.

3. The slope countermeasure structure according to claim 1, wherein:

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