Environmentally friendly materials and connecting units for environmentally friendly materials

Abstract

To provide an environment conservation material reduced in weight, capable of keeping the tension state of a rhombic wire net over the whole region of a space layer, and strong against deformation by an external force.SOLUTION: An environment conservation material 1 is composed of: a spiral cylindrical structure 10 in which a rhombic wire net 10a is wound multiple times in a cylindrical shape as a side face spiral shape, a central space 11 of a prescribed diameter is formed along a winding axis direction at a winding starting end, and a spiral cylindrical space layer 13 of a prescribed thickness is spirally formed between the rhombic wire net 10a on an inner peripheral side and the rhombic wire net 10a on an outer peripheral side in a radial direction; a core coil 12 arranged in the central space 11 along the winding axis direction and keeping an inner diameter of the central space 11; and multiple tension coils 14 of a side face spiral shape arranged along an axial direction in the spiral cylindrical space layer 13, abutting on an inner peripheral side projecting net part forming an arcuate shape of the spiral cylindrical space layer 13 along a winding direction and on an outer peripheral side recessed net part forming the arcuate shape, and holding a prescribed thickness of the spiral cylindrical space layer 13.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to a technique for suppressing the development of various soil erosion scars caused by precipitation such as rain and surface flow on slopes, and for promoting vegetation recovery. [Background technology]

[0002] As a technology for preventing soil erosion caused by the flow of water such as rainwater, mountainside conservation materials have been proposed as environmental conservation materials, as disclosed in Patent Documents 1 and 2. These mountainside conservation materials have a skeleton-type three-dimensional structure (referred to as a spiral cylindrical structure) in which diamond-shaped wire mesh of a predetermined width is wound into a cylindrical shape with its sides spiraled. In the skeleton-type spiral cylindrical structure, a space (referred to as a space layer) of a predetermined thickness is formed in a spiral shape between the diamond-shaped wire mesh on the inner periphery and the diamond-shaped wire mesh on the outer periphery when viewed in the radial direction.

[0003] In the mountainside conservation material of Patent Document 1, in order to maintain the spatial layers of the spiral cylindrical structure at a predetermined thickness (layer thickness), cross coils in the shape of coil springs, made of wire material such as steel wire wound spirally in the radial direction, are screwed into diamond-shaped wire mesh from the radial outside of the spiral cylindrical structure at appropriate intervals, and are screwed forward while engaging with the row wires around the mesh of the diamond-shaped wire mesh that form each spatial layer. Each spatial layer can be maintained by the coil springs engaging with the diamond-shaped wire mesh in the longitudinal direction at predetermined intervals.

[0004] The mountainside conservation material of Patent Document 2 has coil spacers having a shape similar to that of the cross coils arranged at appropriate intervals in the space layers along the length of the row wires, making it possible to hold each space layer.

[0005] In the mountainside conservation materials disclosed in Patent Documents 1 and 2, the axial direction of the spiral cylindrical structure is considered to be the front side, and the spiral cylindrical structure is installed on a slope with the front side facing perpendicular to the water flowing down the slope of the mountainside. Stones, fallen leaves, branches, etc. that flow with the water pass through or are captured by the diamond-shaped wire mesh, and eventually the airspace layer is filled with soil, sand, and gravel.

[0006] The soil, stones, and gravel that flow into the space layer and serve as the filling base are considered to be trapped within the layer. It is expected that soil, stones, and gravel will accumulate upstream of the installation location of the spiral cylindrical structure, preventing outflow, and that scouring due to the flow of soil and gravel will be prevented downstream.

[0007] The diamond-shaped wire mesh that makes up the spiral cylindrical structure is configured by connecting a large number of column wires, each made by continuously bending a wire material such as iron wire into a flat V-shape, in the column direction. The column wires are intertwined in the row direction, which is perpendicular to the column direction. The column wires are intertwined by intertwining the V-shaped portions of adjacent column wires, so that the inner surfaces of the V-shaped portions are in contact with each other. The spiral cylindrical structure is wound with the length direction of the column wires of the diamond-shaped wire mesh as the axial direction and the row direction as the winding direction.

[0008] A characteristic of diamond-shaped wire mesh is that when adjacent row wires are pulled away from each other, the V-shaped portions engage with each other, placing the diamond-shaped wire mesh under tension in the row direction. In this tensioned state, the mesh can rotate around an axis along the row direction, using the connecting portions where the V-shaped portions engage as a fulcrum. When adjacent row wires are moved toward each other, the row-direction connection between the row wires is released, eliminating the tension in the row direction. Meanwhile, the column direction is maintained at a predetermined length (the width of the diamond-shaped wire mesh) due to the rigidity of the row wires.

[0009] The cross coils and coil spacers of the mountainside conservation materials disclosed in Patent Documents 1 and 2 maintain tension on the diamond-shaped wire mesh of the spiral cylindrical structure to maintain the thickness of the spatial layer and prevent deformation of the spiral cylindrical structure due to driftwood, boulders, falling rocks, etc. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent Publication No. 2021-80686 [Non-patent document 2] Japanese Patent Publication No. 2020-112018 Summary of the Invention [Problem to be solved by the invention]

[0011] In the environmental conservation materials disclosed in Patent Documents 1 and 2, in order to maintain the tension of the diamond-shaped wire mesh applied to the spiral cylindrical structure by the cross coils and coil spacers over the entire range of the spatial layer, it would be possible to increase the number of cross coils and coil spacers, but this would result in an increase in the weight of the environmental conservation material.In response to demands to reduce the burden of transporting environmental conservation materials to installation locations with poor footing, such as mountainsides, the environmental conservation material is made lightweight by using a skeleton type.

[0012] The object of the present invention is to provide an environmental conservation material that is lightweight, can maintain tension in the diamond-shaped wire mesh that makes up the spiral cylindrical structure over the entire range of the spatial layer, and is resistant to deformation due to external forces, a connecting unit for the environmental conservation material, and a method for installing the environmental conservation material. [Means for solving the problem]

[0013] The environmental conservation material of the first invention that realizes the object of the present invention is an environmental conservation material that can be filled with soil, gravel, etc. that flows into the internal space and can drain water that flows into the internal space, and has a mesh member that is spirally wound on the side with the width direction as the winding axis direction. Complex The spiral cylindrical structure is wound several times, forming a central space of a predetermined diameter at the winding start end along the winding axis direction, and a spiral cylindrical spatial layer of a predetermined thickness formed in a spiral shape between an inner mesh portion and an outer mesh portion in the radial direction; a hollow core member arranged within the central space along the winding axis direction to maintain the inner diameter of the central space; and a plurality of lateral spiral-shaped spatial layer retaining members arranged at appropriate intervals along the axial direction within the spiral cylindrical spatial layer to abut against the arc-shaped inner convex mesh portion and the arc-shaped outer concave mesh portion of the spiral cylindrical spatial layer along the winding direction, thereby maintaining the predetermined thickness of the spiral cylindrical spatial layer.

[0014] The environmental conservation material of the second invention, which realizes the object of the present invention, is the environmental conservation material of the first invention, in which the mesh member is a diamond-shaped wire mesh, the row line direction is the width direction, and the parallel direction of the row lines is the winding direction.

[0015] An environmental conservation material according to a third aspect of the present invention that achieves the object of the present invention is the environmental conservation material according to the first or second aspect of the present invention, wherein the space layer retaining member is formed in a spiral shape using a wire material.

[0016] The environmental conservation material of the fourth invention, which realizes the object of the present invention, is an environmental conservation material of any of the first to third inventions, wherein the plurality of spatial layer retaining members can be composed of end-side spatial layer retaining members arranged at both ends of the width direction of the mesh member, and one or more intermediate spatial layer retaining members arranged between the spatial layer retaining members at both end-sides.

[0017] The environmental conservation material of the fifth invention, which realizes the object of the present invention, is the environmental conservation material of the fourth invention, in which the spatial layer retaining member on the end side can be configured so that a portion of the widthwise direction protrudes outward in the widthwise direction beyond the outer widthwise end of the mesh member.

[0018] The environmental conservation material of the sixth invention that realizes the object of the present invention is an environmental conservation material of any one of the first to fifth inventions, in which the space layer retaining member can be constructed by connecting multiple members in series.

[0019] The environmental conservation material of the seventh invention, which realizes the object of the present invention, is an environmental conservation material of any of the third to sixth inventions, in which the spatial layer retaining member formed in a spiral shape from wire can be configured so that the end on the spiral center side is formed in an end coil shape.

[0020] The environmental conservation material of the eighth invention that realizes the object of the present invention is an environmental conservation material of any one of the first to seventh inventions, in which the core member can be configured to be formed in a spiral shape using wire.

[0021] The environmental conservation material of the ninth invention that achieves the object of the present invention is the environmental conservation material of the eighth invention, wherein the outer diameter of the core member is larger than the outer diameter of the space layer retaining member.

[0022] The environmental conservation material of the 10th invention, which realizes the object of the present invention, is an environmental conservation material of any of the 1st to 9th inventions, in which a tortoiseshell wire mesh is provided on the inside of the end of the winding of the mesh member that constitutes the spiral cylindrical structure, with the same width as the width of the mesh member, and the mesh size of the tortoiseshell wire mesh is smaller than the mesh size of the mesh member.

[0023] The environmental conservation material of the eleventh invention, which achieves the object of the present invention, is an environmental conservation material of a parallel connection configuration in which any of the environmental conservation materials of the first to tenth inventions are connected in parallel as a first environmental conservation material part and a second environmental conservation material part, respectively, and integrated, and the first environmental conservation material part and the second environmental conservation material part are arranged side by side so that the winding end of the spatial layer retaining member of the first environmental conservation material part faces the winding end of the spatial layer retaining member of the second environmental conservation material part, and the opposing winding end parts are connected to each other by connecting members, and the winding end of the mesh member that forms the spiral cylindrical structure of the first environmental conservation material part is fixed to the outermost mesh member that forms the spiral cylindrical structure of the second environmental conservation material part, and the winding end of the mesh member that forms the spiral cylindrical structure of the second environmental conservation material part is fixed to the mesh member that forms the spiral cylindrical structure of the first environmental conservation material part.

[0024] The environmental conservation material of the 12th invention that realizes the object of the present invention can be configured as the environmental conservation material of the 11th invention, wherein the outer diameter of the spiral cylindrical structure of the first environmental conservation material part is larger than the outer diameter of the spiral cylindrical structure of the second environmental conservation material part, and the mesh size of the mesh member that makes up the spiral cylindrical structure of the first environmental conservation material part is larger than the mesh size of the mesh member that makes up the spiral cylindrical structure of the second environmental conservation material part.

[0025] The environmental conservation material connecting unit of the 13th invention, which achieves the object of the present invention, can be configured to include an environmental conservation material row in which a plurality of environmental conservation materials of any of the first to tenth inventions are arranged in series along the winding axis direction, and a joint member that connects opposing ends of the environmental conservation materials so that adjacent environmental conservation materials in the row can be foldable.

[0027] The object of the present invention is achieved 14 The connecting unit for environmental conservation materials of the invention can be configured to include an array of environmental conservation materials in which a plurality of environmental conservation materials of any of the first to tenth inventions are arranged in series along the winding axis direction, and a fixed coil that is screwed into the mesh portions of the opposing ends of adjacent environmental conservation materials in the array of environmental conservation materials to connect the environmental conservation materials together.

[0028] The object of the present invention is achieved 15 The method for applying the environmental conservation material of the invention is the same as that of any one of the first to tenth inventions. 、 or 13th or the 14th Akira A ren of When the installation area where the connecting units are to be installed has a long slope, the environmental conservation materials or the connecting units can be installed at predetermined intervals along the slope.

[0029] The object of the present invention is achieved 16 The method for applying the environmental conservation material of the invention is the same as that of any one of the first to tenth inventions. 、 or 13th or the 14th Akira A ren of When the installation area where the connecting unit is to be installed has a slope that continues over multiple levels, the environmental conservation material or the connecting unit can be installed at the downstream end of each slope.

[0030] The object of the present invention is achieved 17 The method for applying the environmental conservation material of the invention is the same as that of any one of the first to tenth inventions. 、 or 13th or the 14th Akira A ren of When the installation area where the connecting unit is to be installed has a slope downstream of a steeply sloping wall, the environmental conservation material or the connecting unit can be installed on the slope near the boundary with the wall.

[0031] The object of the present invention is achieved 18The method of installing the environmental conservation material of the invention can be a method in which, when the installation area where the environmental conservation material of the 12th invention is installed has a steep slope, the first environmental conservation material section is installed on the upstream side and the second environmental conservation material section is installed on the downstream side.

[0032] The object of the present invention is achieved 19 The method for applying the environmental conservation material of the invention is the same as that of any one of the first to tenth inventions. 、 or 13th or the 14th Akira A ren of If the installation area for the connecting unit is a valley, anchor devices can be placed in advance on the ground in the width direction of the valley at appropriate intervals, and the environmental conservation material or the connecting unit can be directly attached to the anchor devices.

[0033] The object of the present invention is achieved 20 The method for applying the environmental conservation material of the invention is the same as that of any one of the first to tenth inventions. 、 or 13th or the 14th Akira A ren of If the installation area for the connection unit is a valley, anchor rods can be placed in advance on the ground in the width direction of the valley at appropriate intervals, and both ends of a wire rope that has been passed through the environmental conservation material or the connection unit in advance can be attached to the anchor rods.

[0034] The object of the present invention is achieved 21 The method for applying the environmental conservation material of the invention is the same as that of any one of the first to tenth inventions. 、 or 13th or the 14th Akira A ren of When the installation area where the connecting unit is to be installed is a wall surface that is continuous with the widthwise end of the valley portion and runs from the upstream side to the downstream side of the valley portion, anchor rods can be placed in advance at the lower end of the wall surface at appropriate intervals from the upstream side to the downstream side, and both ends of a wire rope that has been passed through the environmental conservation material or the connecting unit in advance can be attached to the anchor rod, or the environmental conservation material or the connecting unit can be directly attached to the anchor rod. [Effects of the Invention]

[0035] According to the first aspect of the present invention, the spiral cylindrical structure can be kept lightweight and deformation due to external force can be suppressed by the space layer holding member, and the spiral cylindrical space layer can be held in both the winding axis direction and the radial direction.

[0036] According to the second aspect of the present invention, the diamond-shaped wire mesh can be particularly kept in a tensioned state.

[0037] According to the third aspect of the present invention, the space layer retaining member contributes to weight reduction, captures gravel and the like that has flowed into the spiral cylindrical space layer, and can fully exhibit the function of draining water.

[0038] According to the fourth aspect of the present invention, the thickness of the spiral cylindrical space layer can be maintained in the direction of the winding axis.

[0039] According to the fifth aspect of the present invention, the widthwise ends of the net member constituting the spiral cylindrical structure can be covered, thereby preventing hands and the like from directly touching the widthwise ends of the net member.

[0040] According to the sixth aspect of the present invention, when the outer diameter of the spiral cylindrical structure of the environmental conservation material is increased, the length of the spatial layer retaining member also increases. Since it is easier to manufacture a short spatial layer retaining member than a long spatial layer retaining member, and since it is easy to store and handle after manufacture, it becomes easy to form the spatial layer retaining member into a lateral spiral shape.

[0041] According to the seventh aspect of the present invention, the end turn portion is resistant to deformation due to an external force directed inward in the radial direction, and the thickness of the spiral cylindrical space layer on the spiral center side can be maintained.

[0042] According to the eighth aspect of the present invention, the weight of the environmental conservation material is reduced, and the flow of water into the central space is not impeded.

[0043] According to the ninth aspect of the present invention, by increasing the outer diameter of the core member, the entire spiral cylindrical structure can be firmly held in a desired shape.

[0044] According to the tenth invention, when environmental conservation material is placed on a slope with the side with the tortoiseshell wire mesh as the bottom, the soil and gravel from the upstream side of the slope naturally flows into the spiral cylindrical structure, and the soil and gravel that has accumulated on the tortoiseshell wire mesh and the soil and gravel that has fallen through the tortoiseshell wire mesh to the ground on which the material is placed connect together, burying the tortoiseshell wire mesh and allowing the material to play a role in supporting the ground on which it is placed.

[0045] 11th, 12th, 1st 18 According to the invention, since the system has a two-stage filtering function consisting of the first environmental conservation materials section and the second environmental conservation materials section, soil, gravel, etc. that has passed through the environmental conservation materials section installed upstream reaches the environmental conservation materials section installed downstream, ensuring that soil, gravel, etc. are deposited upstream of the environmental conservation materials section installed downstream.

[0046] In particular, by installing the first environmental conservation material section on the upstream side of the slope, for example, on a steeply inclined surface, the flow rate of sediment, gravel, etc. can be reduced, preventing damage to the second environmental conservation material section. Furthermore, large-diameter stones, driftwood, etc. can be blocked by primary filtering with the first environmental conservation material section, and the relatively small-diameter stones and other sediment, gravel, etc. that have passed the primary filtering can be secondary filtered by the second environmental conservation material section, allowing water to be efficiently drained downstream.

[0047] According to the thirteenth invention, it is not easy to manufacture long environmental conservation materials and transport them to the installation area, but by connecting shorter environmental conservation materials in a foldable manner, they can be folded to make them compact, making them easy to transport to the installation area and also easy to unfold into a linear state at the installation area.

[0049] No. 14 According to the invention, by connecting multiple environmental conservation materials in the installation area, it is possible to obtain environmental conservation materials of the desired length, and since the work is done by screwing in fixed coils, the work of connecting environmental conservation materials can be done easily.

[0050] No. 15According to the invention, environmental conservation materials can be effectively installed over a large installation area.

[0051] No. 16 According to the invention, the flow rate of water, soil, gravel, etc. flowing down from the downstream end of the slope can be slowed down, thereby making it possible to prevent scouring, etc. on the downstream slope as much as possible and to reliably secure an area on the upstream side of the slope for depositing soil, gravel, etc.

[0052] No. 17 According to the invention, water flowing down from the upstream slope continuing to the top of the steeply sloping wall resembles a waterfall, scouring the area where it falls. However, by placing environmental conservation materials in areas where scouring is likely to occur, they act as a water cushion, and gravel and other materials that flow down with the water are filled into the spiral cylindrical space layer of the spiral cylindrical structure, absorbing the impact of the falling water.

[0053] No. 19 , 20 , 21 According to the invention, the environmental conservation material or the connecting unit can be appropriately installed depending on the ground condition of the installation area. [Brief explanation of the drawings]

[0054] [Figure 1A] 1 is a perspective view showing a first embodiment of an environmental conservation material according to the present invention, in which the diamond-shaped wire mesh that constitutes the spiral cylindrical structure is omitted. [Figure 1B] FIG. 2 is a perspective view showing the environmental conservation material shown in FIG. 1, in which the spatial layer holding member arranged in the spiral cylindrical spatial layer is omitted. [Figure 2A] FIG. 1B is a schematic perspective view of the space layer holding member shown in FIG. 1A. [Figure 2B] FIG. 1B is a side view of the environmental protection material shown in FIG. 1A. [Figure 3] 3(a) is a development view of the environmental conservation material shown in FIG. 1A, and FIG. 3(b) is a view taken along the line AA in FIG. 3(a). [Figure 4]10A and 10B are schematic diagrams of the first connecting unit showing the second embodiment of the environmental conservation material according to the present invention, where (a) is a front view of the connected state, (b) is a top view of (a), and (c) is a top view showing the folded state. [Figure 5] FIG. 10 is a schematic front view of a second connecting unit showing a third embodiment of the environmental conservation material according to the present invention. [Figure 6] 10A shows a fourth embodiment of the third connecting unit of environmental conservation materials according to the present invention, in which (a) is a front view of the aligned state before connection, and (b) is a front view of the connected state in which three aligned environmental conservation materials shown in (a) are connected by a joint member. [Figure 7] 10(a) to 10(f) show a fourth embodiment of the present invention, illustrating a joint structure for connecting third connecting units with joint members. [Figure 8A] 5 shows a fifth embodiment of the present invention for supporting environmental conservation material at a target site using an anchor device, where (a) is a front view of a first support configuration for supporting one environmental conservation material shown in FIG. 1, and (b) is a front view of a second support configuration for supporting the first connecting unit shown in FIG. 4. [Figure 8B] 6(a) shows a fifth embodiment of the present invention for supporting environmental conservation material at a target site using an anchor device, where (a) is a front view of a third support form for supporting the second connecting unit 3 shown in FIG. 5, and (b) is a front view of a fourth support form for supporting the third connecting unit 4 shown in FIG. 6(b). [Figure 9] 8A and 8B, and FIG. 8B is a view taken along the arrow BB in FIG. 8A. [Figure 10] 10(a) to 10(c) are schematic side views of a sixth embodiment showing the installation state of the environment conservation material shown in FIGS. 1, 4, 5, and 6 on sloping ground. [Figure 11] FIG. 10 is a schematic top view of a seventh embodiment for explaining a construction method for installing the environmental conservation materials shown in FIGS. 1, 4, 5, and 6 in an environmental conservation installation area. [Figure 12] FIG. 10 is a development view showing an eighth embodiment of the environmental conservation material according to the present invention. [Figure 13] FIG. 10 is a schematic side view showing a ninth embodiment of an environmental conservation material according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0055] Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

[0056] 1A, 1B, 2A, 2B, and 3 show a first embodiment of an environmental conservation material according to the present invention. In Fig. 1A and 1B, the X-axis, Y-axis, and Z-axis represent three axes that are perpendicular to one another.

[0057] The environmental conservation material 1 of the first embodiment has a spiral cylindrical structure 10 formed by winding a diamond-shaped wire mesh 10a, which has a rectangular shape when unfolded, into a cylindrical shape with spiral sides along the width direction (X-axis direction) which is the direction of the winding axis, a core member 12 of approximately the same width which is arranged in a central space portion 11 at the center of the winding of the spiral cylindrical structure 10 and extends along the direction of the winding axis, and a plurality of space layer holding members 14 with spiral sides which are arranged at appropriate intervals along the direction of the winding axis in a spiral cylindrical space layer 13 of the spiral cylindrical structure 10.

[0058] As shown in Figure 3, the diamond-shaped wire mesh 10a that constitutes the spiral cylindrical structure 10 has row wires 10b, each formed by continuously bending wire material into a roughly V-shape. The length direction of the row wires 10b is defined as the width direction (or column direction), and the direction in which the row wires 10b are arranged side by side is defined as the row direction. Adjacent row wires 10b in the row direction are intertwined so that their roughly V-shaped V-shaped portions 10c intersect. Furthermore, the intersections of the diamond-shaped wire mesh 10a function as a kind of hinge. When adjacent row wires 10b are pulled away from each other in the row direction, the V-shaped portions 10c at the intersections are connected, tensioning the diamond-shaped wire mesh 10a in the pulling direction. Furthermore, in this tensioned state, adjacent row wires 10b rotate about the intersections, allowing the diamond-shaped wire mesh 10a to be wound.

[0059] The spiral cylindrical structure 10 has an approximately cylindrical central space 11 formed at the starting end of the winding of the diamond-shaped wire mesh 10a, and following the central space 11, a spiral cylindrical space layer 13 of a predetermined thickness is formed in a spiral shape in the Y-axis and Z-axis directions between the inner mesh portion and the outer mesh portion in the radial direction.

[0060] As shown in FIG. 2B, if the inner diameter of the central space 11 is D1 and the inner diameter of the spiral cylindrical space layer 13 is D2, then in this embodiment, D1 = 2·D2. The environmental conservation material 1 has the core member 12 fixed to the winding start end of the diamond-shaped wire mesh 10a, for example, with a connecting coil (not shown), and the winding start end of the diamond-shaped wire mesh 10a around the core member 12 is positioned on the diamond-shaped wire mesh 10a, thereby forming the central space 11. As shown in FIG. 3, the bent shape of the wire at the end of the row wires 10b of the diamond-shaped wire mesh 10a is such that the valleys of adjacent row wires 10b are simply intertwined, similar to the intersections, resulting in a knuckle-less end. Note that the shape of the row wires 10b of the diamond-shaped wire mesh 10a in the present invention is not limited to a knuckle-less shape; it may also be a complete knuckle, in which the ends of the row wires 10b are completely connected.

[0061] The core member 12 disposed within the central space 11 has a length approximately equal to the length of the spiral cylindrical structure 10 in the winding axis direction, and the central space 11 is maintained in its inner diameter by being wrapped around the diamond-shaped wire mesh 10a that constitutes the central space 11. The core member 12 is expected to have a hollow shape with a space formed along the winding axis direction in terms of water permeability, and also to have water permeability in the radial direction, contributing to weight reduction of the environmental conservation material 1. It is also desirable for the core member 12 to be low-cost. For these reasons, in this embodiment, the core member 12 is formed by spirally winding a wire material such as an iron wire at a predetermined pitch, and has a shape similar to that of a compression coil spring. In the following description of the embodiment, the core member will be referred to as a core coil 12. The coupling coil is formed by spirally winding a wire material such as an iron wire at a predetermined pitch, and has the same external shape as the core coil 12. However, the outer diameter of the coupling coil is smaller than the outer diameter of the core coil 12, and the core coil 12 is fixed to the winding start end of the diamond-shaped wire mesh 10a by threading it along the winding axis while engaging the wire of the core coil with the mesh of the diamond-shaped wire mesh 10a in a stitching manner. As the diamond-shaped wire mesh 10a is subsequently wound, the tip of the tension coil 14 (described below) is wound in, forming a side spiral shape of the tension coil 14. The winding end 10d of the diamond-shaped wire mesh 10a is attached by preparing, for example, one row wire 10b on the outermost diamond-shaped wire mesh 10a and engaging the valleys together in a stitching manner.

[0062] The spatial layer retaining member 14 disposed in the spiral cylindrical spatial layer 13 is disposed in contact with the inner mesh portion and the outer mesh portion of the spiral cylindrical spatial layer 13 along the winding direction, and has a layer thickness retaining function of maintaining the radial thickness (hereinafter referred to as layer thickness) of the spiral cylindrical spatial layer 13. Furthermore, the spatial layer retaining member 14 can be formed into a side spiral shape, such as a tube, in order to maintain the layer thickness of the spiral cylindrical spatial layer 13. Furthermore, it is desirable to ensure water permeability, enable the capture of gravel and fallen leaves and branches, facilitate the formation of a side spiral shape, and contribute to reducing the weight of the environmental conservation material 1. For these reasons, in this embodiment, the spatial layer retaining member 14 is formed by spirally winding a wire, such as an iron wire or stainless steel wire, at a predetermined pitch, and has a side spiral shape similar to that of a compression coil spring. Hereinafter, in the description of the embodiment, the spatial layer retaining member will be referred to as a tension coil. The side spiral shape of the tension coil 14 includes not only a single coil-shaped member, but also a configuration in which a plurality of coil-shaped members are connected or arranged in series with gaps in the winding direction.

[0063] For example, four tension coils 14 are arranged at equal intervals along the winding axis, but this number is not limited to four and may be three, five, or three. The spacing is preferably determined to ensure tension without distortion of the row wires or mesh after winding. The tension coil 14, which has a spiral side shape, has elasticity in the direction of diameter expansion and abuts against the concave outer mesh portion of the diamond-shaped wire mesh 10a that constitutes the spiral cylindrical space layer 13. This concave mesh portion conforms to the convex shape of the outer periphery of the tension coil 14, tensioning the diamond-shaped wire mesh 10 in the row direction. Note that, as mentioned above, the diamond-shaped wire mesh 10a has adjacent row wires 10b intertwined with each other so that their approximately V-shaped V-shaped portions 10c intersect, forming hinges. Therefore, the spiral surface of the diamond-shaped wire mesh 10a is not strictly a continuous curved surface, but rather resembles a polygon with the hinges as vertices. Therefore, the outer and inner surfaces of the side spiral tension coil 14 do not abut on the diamond-shaped wire mesh over the entire surface in the winding direction, but only partially.

[0064] Installation of environmental conservation materials 1 and environmental conservation functions

[0065] The environmental conservation material 1 of this embodiment is installed on slopes where the ground may be scouring due to the flow of rainwater, etc., or in gullies where scouring has already begun, to prevent ground scouring. The environmental conservation material 1 is placed on the ground with the spiral cylindrical structure 10 oriented so that the winding axis is perpendicular to the flow of water.

[0066] If the surface of the spiral tubular structure 10 facing the direction of water flow in the winding axis direction is defined as the front, water flows toward the front of the spiral tubular structure 10, and stones, fallen leaves, branches, and other soil and gravel that flows with the water pass through the outermost surface of the diamond-shaped wire mesh 10a and enter the spiral tubular space layer 13. Then, in the initial stage of installation, some stones, fallen leaves, and branches pass through the spiral tubular space layer 13 and flow downstream from the rear surface of the spiral tubular structure 10. Gradually, stones and other soil and gravel naturally fill the spiral tubular space layer 13. Furthermore, from the initial stage of installation, soil and gravel such as stones, fallen leaves, and branches that cannot pass through the meshes of the diamond-shaped wire mesh 10a at the outermost periphery on the front side are captured by the meshes of the diamond-shaped wire mesh 10a at the outermost periphery on the front side, forming a layer of soil and gravel such as stones, fallen leaves, branches, and soil in front of the front side of the spiral tubular structure 10.

[0067] The process of filling and depositing stones, fallen leaves, branches, and other soil and gravel caused by the spiral cylindrical structure 10 is only one example, as it depends on natural phenomena. For example, even in the early stages of installation, if a large amount of soil and gravel flows toward the environmental conservation material 1 at once, the soil and gravel will fill the spiral cylindrical space layer 13, and the deposit layer will be formed in front of the spiral cylindrical structure 10.

[0068] When stones and other materials are naturally packed into the spiral cylindrical space layer 13, water passes through the packed layer and flows downstream, but the movement of the stones and other materials is blocked. Also, sediment and gravel accumulate in front of the front of the spiral cylindrical structure 10 (upstream of the installation location). As a result, scouring by gravel and other materials is prevented on the downstream side of the spiral cylindrical structure, and soil runoff is prevented on the upstream side. Furthermore, water accumulates on the top surface of the sediment layer of sediment and gravel formed on the upstream side of the spiral cylindrical structure 10, but because this sediment layer is permeable, the accumulated water passes through the sediment layer and through the spiral cylindrical structure 10 to be drained downstream.

[0069] The environmental conservation material 1 of this embodiment is configured with a spiral structure 10, which is made of diamond-shaped wire mesh 10a wound in a spiral shape with multiple turns, and the spiral cylindrical space layer 13 is maintained in thickness by a tension coil 14 with a spiral side configuration. Because the environmental conservation material 1 is installed in a gully or other location eroded by water such as rainwater, it is likely to be hit by large stones, driftwood, or the like. Even if a large stone or driftwood strikes the outermost surface of the spiral structure 10, damage to the diamond-shaped wire mesh 10a itself is minimal due to the shock absorption characteristics of the diamond-shaped wire mesh 10a. Furthermore, because the tension coil 14 is formed in a spiral side configuration, it has elasticity in the radial outward direction. Therefore, the tension coil 14 has a strong ability to repel impacts from collisions with large stones, driftwood, or the like, and has a high layer thickness maintenance capability. The spiral cylindrical space 13 has a plurality of compartments (three compartments in this embodiment) separated by a plurality of tension coils 14 (four in this embodiment) arranged at appropriate intervals in the winding axis direction. Each compartment is surrounded by the mesh portion of the diamond-shaped wire mesh 10a and the tension coils 14, forming a kind of net cage shape, which exhibits high filling performance for stones, fallen leaves, branches, and other soil and gravel while maintaining water permeability.

[0070] To wind the diamond-shaped wire mesh 10a into a spiral cylindrical shape, as shown in Figure 3, multiple tension coils 14 are placed on the expanded diamond-shaped wire mesh 10a along the row direction of the diamond-shaped wire mesh 10a, with the axial directions aligned and spaced apart to maintain tension across the width of the mesh. Then, a core coil 12 is placed along the winding axis, starting at one end of the row direction of the diamond-shaped wire mesh 10a, and winding of the diamond-shaped wire mesh 10a begins together with the core coil 12. As the diamond-shaped wire mesh 10a is wound, the tension coil 14 is wound around it, and the diamond-shaped wire mesh 10a is wound up to form the spiral structure 10. In this case, the outer diameter of the tension coil 14 corresponds to the thickness of the spiral cylindrical space 13. While the end of the tension coil 14 at the winding start end is open, the first or second turn may be tightly wound, with the wire rods in contact with each other without any gaps. This facilitates winding of the diamond-shaped wire mesh 10a. This method is merely an example, and the diamond-shaped wire mesh 10a may be wound around a tension coil 14 that has been bent into a spiral shape on its side in advance.

[0071] Modification of the first embodiment

[0072] The spiral structure 10 of the first embodiment is an unfilled type in which the spiral cylindrical space 13 remains unfilled until it is installed in the environmental conservation material installation area. Alternatively, a prefilled spiral structure may be used in which the spiral cylindrical space 13 is prefilled with a porous material such as scoria or pumice, or a prefiller such as wood chips. In this case, the time from when the environmental conservation material 1 is installed in the environmental conservation material installation area until a sediment layer of soil, gravel, etc. begins to form in front of the environmental conservation material 1 can be shortened. Furthermore, by specifying the filler material, it is possible to expect the structure to function as a filter.

[0073] To increase the outer diameter of the spiral structure 10, the number of turns of the diamond-shaped wire mesh 10a can be increased, the layer thickness can be increased (increasing the outer diameter of the tension coil 14), or the outer diameter of the core coil 12 can be increased. In this case, the length of the diamond-shaped wire mesh 10a in the row direction will increase proportionally, and the length of the tension coil 14 will also increase. If the overall length of the tension coil 14 is long, due to the difficulty of manufacturing, etc., it is also possible to divide the tension coil 14 into multiple parts and connect the wire at the rear end and front end of the tension coil by inserting them into short aluminum tubes, for example, and crimping them together.

[0074] On the other hand, to increase the length (width) of the spiral structure 10 in the direction of the winding axis, the row wires 10b of the diamond-shaped wire mesh 10 can be lengthened. If the width of the environmental conservation material 1 is too long, not only will it be difficult to handle, but it will also be heavy. For example, it would be difficult for a single worker to carry the environmental conservation material 1 up a mountain path, and truck transport would also be limited in length. Furthermore, from the standpoint of ease of fabrication and weight, a width of approximately 1 meter, for example, and a maximum diameter of approximately 1 meter are appropriate for the environmental conservation material 1. With this size, the spiral structure 1 can be flown and transported to the installation site by drone. Of course, the size is not limited to this range, and as long as the environmental conservation material 1 can be transported to the installation site by truck or heavy machinery, there is no problem with increasing the width or outer diameter of the environmental conservation material 1.

[0075] When the width of the site for environmental conservation installation is wide, a plurality of environmental conservation materials 1 are connected in series in the width direction. Second embodiment

[0076] FIG. 4 is a schematic view of a connecting unit of an environment conservation material showing a second embodiment of the present invention.

[0077] The connecting unit (hereinafter referred to as the first connecting unit) 2 of the environmental conservation material shown in the second embodiment connects a first environmental conservation material 1A and a second environmental conservation material 1B, which have the same structure and size as the environmental conservation material 1 shown in the first embodiment, in series with a hinge member 20 to form an environmental conservation material row. FIG. 4(a) shows a front view of the first connecting unit 2, and FIG. 4(b) shows a top view of the first connecting unit 2. Note that the first environmental conservation material 1A and the second environmental conservation material 1B are shown as simply circles rather than spiral structures, with the spiral cylindrical structure 10 and tension coil 14 simplified. The environmental conservation material 1 is similarly simplified in the following embodiments. The hinge member 20 is formed by winding a wire material, such as iron or stainless steel, in a spiral shape with a predetermined pitch, forming a shape similar to a compression coil spring, and is hereinafter referred to as a hinge coil. The hinge coil 20 has an inner diameter larger than the mesh size of the diamond-shaped wire mesh 10a, for example about twice as large, and a length substantially the same as the outer diameter of the first environment conservation material 1A or the second environment conservation material 1B.

[0078] The first connecting unit 2 butts the end faces of the first and second environmental conservation materials 1A and 1B in the direction of their winding axis, and the hinge coil 20 is twisted tangentially from the outside into the mesh portion of the diamond-shaped wire mesh 10a so as to straddle the butted end faces. As shown in Figure 4(b), the hinge coil 20 is twisted so that its center is at the butt position of the first and second environmental conservation materials 1A and 1B in the direction of their winding axis, and also at the outermost surface of the first environmental conservation material 1A (or second environmental conservation material 1B). The hinge coil 20 functions as a hinge member because its wound portion engages with the row wires 10b so as to weave through the mesh of the diamond-shaped wire mesh 10a that constitutes the first and second environmental conservation materials 1A and 1B. The first environmental conservation material 1A and the second environmental conservation material 1B can be folded between a linearly connected serial state as shown in Figure 4(a) and a folded state in which they are stacked on top of each other with the hinge coil 20 as a fulcrum as shown in Figure 4(c).

[0079] The first connecting unit 2 is transported to the environmental conservation material installation area in the overlapping folded state shown in Figure 4(c), and during construction it is installed in the straight line state shown in Figure 4(a) or in a V-shaped state between the straight line state and the overlapping folded state.

[0080] The first connecting unit 2 of the second embodiment can avoid the need to connect the two environmental conservation materials 1A and 1B at the construction site, allowing for quick and safe installation of the two environmental conservation materials 1A and 1B. Furthermore, the length in the winding axis direction is short when transporting the materials to the mountainside, allowing for safe transportation. Furthermore, transportability is good when transporting the materials long distances by truck, box, etc. Third embodiment

[0081] FIG. 5 is a schematic view of a connecting unit of an environment conservation material showing a third embodiment of the present invention.

[0082] The connecting unit (hereinafter referred to as the second connecting unit) 3 of environmental conservation materials shown in the third embodiment comprises the first environmental conservation material 1A and the second environmental conservation material 1B shown in the second embodiment, as well as third environmental conservation materials 1C of the same size connected in series by connecting members 21 to form an environmental conservation material row.

[0083] As the connecting member 21, a wire rope 21a is passed through each core coil 12 of the first environmental protection material 1A, the second environmental protection material 1B, and the third environmental protection material 1C, which are arranged in series, and a wire course 21c is attached to each end 21b of the wire rope 21a beforehand, or the wire course 21c is attached after passing through (referred to as a wire rope with a wire course). The wire course 21c is a ring-shaped metal fitting with a U-shaped groove formed in the circumferential direction on its outer periphery, and the penetrating end of the wire rope 21a, which is folded back into a ring shape, is fitted into the groove to secure it.

[0084] In the second connection unit 3 of the third embodiment, the ends of the first environmental conservation material 1A and the second environmental conservation material 1B are not fixed together but are left free, and similarly, the ends of the second environmental conservation material 1B and the third environmental conservation material 1C are also left free. The task of lining up multiple environmental conservation materials 1 at the installation site is time-consuming. With the second connection unit 3, three environmental conservation materials 1 (1A, 1B, 1C) are transported side by side to the installation site, and when both ends of the wire rope 21a are pulled in the width direction of the installation site, the three environmental conservation materials 1 (1A, 1B, 1C) are connected in series. Fourth embodiment

[0085] 6 and 7 show a fourth embodiment.

[0086] In the third embodiment, three environmental conservation materials 1 (1A, 1B, 1C) are connected in series by a wire rope 21a. In contrast, in this modified example, instead of the wire rope 21a, an iron bar 22 is inserted through each core coil 12 of the first, second, and third environmental conservation materials 1A, 1B, and 1C, which are arranged in series. In this embodiment, as shown in FIG. 6(a), the three environmental conservation materials 1 (1A, 1B, 1C) are aligned in series by the iron bar 22. As shown in FIG. 6(b), the three environmental conservation materials 1 (1A, 1B, 1C) aligned in a row at the installation site are connected by a plurality of joint members 23 that cross over the butted end faces of the first and second environmental conservation materials 1A and 1B, forming an environmental conservation material row. In addition, the second environmental conservation material 1B and the third environmental conservation material 1C are similarly connected by a plurality of joint members 23 so as to straddle the butt end faces, thereby forming a third connection unit 4 that connects the first environmental conservation material 1A, the second environmental conservation material 1B, and the third environmental conservation material 1C together.

[0087] The joint member 23 has the same configuration as the hinge member 20, and will be referred to as a hinge coil hereinafter. As shown in FIGS. 7(a) to 7(d), the connection structure using the fixed coil 23 is such that, when the outer diameter D3 of the spiral cylindrical structure 10 of the environmental conservation material 1 (1A, 1B, 1C) is taken as D3, the axial length of the fixed coil 23 is approximately (D3-D1) / 2. The fixed coil 23 is screwed into the mesh portion of the diamond-shaped wire mesh 10a from the radial outside of the spiral cylindrical structure 10 toward the winding center. In this embodiment, the number of fixed coils 23 varies depending on the outer diameter D3 of the spiral cylindrical structure 10. The outer diameters D3 of the spiral cylindrical structures 10 shown in Figures 7(a) to 7(d) are D3 = 500 mm, 650 mm, 850 mm, and 1000 mm, respectively, and each spiral cylindrical structure 10 has four, six, six, and eight fixed coils 23 arranged symmetrically around the winding center.

[0088] 7(e) and 7(f), when the outer diameter D3 of the spiral cylindrical structure 10 is small, for example, D3=170 mm or D3=350 mm, the length of the fixed coil 23 is set to be approximately the same as the outer diameter D3 of the spiral cylindrical structure 10, and the fixed coil 23 is screwed into the mesh portion of the diamond-shaped wire mesh 10a from the radial outside of the spiral cylindrical structure 10 toward the winding center, and the screwed end is further screwed into the mesh portion at the outermost periphery on the opposite side.

[0089] 6(b), the fixed coil 23 used in this embodiment has a tip end 23a on the screwing side as an open end and a base end 23b on the opposite side as a terminal with, for example, one turn tightly attached. When the fixed coil 23 is manually inserted and screwed into the butt joints of adjacent environmental conservation materials 1 (1A, 1B, 1C), the base end 23b can be safely held by hand, and the tip end 23a of the fixed coil 23 threads forward while engaging with the mesh portion of the diamond-shaped wire mesh 10a.

[0090] The above one unit Only The environmental conservation material 1, first connecting unit 2, second connecting unit 3, and third connecting unit 4 are installed with the axial side of the spiral cylindrical structure 10 facing forward, perpendicular to the water flowing past the front side of the spiral cylindrical structure 10. In this embodiment, any of the outer peripheral surfaces of the spiral cylindrical structure 10 can be grounded to the ground at the installation site. As an example of how the spiral cylindrical structure 10 is installed, the winding end of the diamond-shaped wire mesh 10a is grounded to the ground G along the downstream side of the water flow. In this case, soil, sand, and gravel can enter the spiral cylindrical space layer 13 between the winding end of the spiral cylindrical structure 10 and the diamond-shaped wire mesh 10a on its inner periphery, preventing the mesh portion of the diamond-shaped wire mesh 10a on the winding end side from being rolled up.

[0091] 8A and 8B show a fifth embodiment, and FIG. 9 shows an anchoring device.

[0092] As shown in Figures 8A(a)(b) and 8B(a)(b), when one environmental conservation material 1 and the first to third connecting units 2 to 4 are installed in the environmental conservation material installation area, they are supported in the installation position by anchor devices 30 to prevent them from moving due to their own weight on sloping ground and to prevent them from being swept away by falling soil and gravel, rocks, driftwood, etc. Figure 9 shows such an anchor device 30.

[0093] Fig. 8A(a) shows a case where one environmental conservation material 1 is supported by an anchor device 30. As shown in Fig. 9(a), the anchor device 30 has an anchor rod 31 made of a threaded steel bar whose lower part has been driven into the installation ground G in advance, a coil spring-shaped screw body 32 that screws onto the threaded joint of the anchor rod 31, and a coil spring-shaped washer coil 33 that is loosely fitted into the anchor rod 31. The anchor devices 30 are provided at both ends of the environmental conservation material 1 in the winding axis direction.

[0094] Threaded steel bars are specified in JIS G3112-2020. As shown in Figure 9(b), the rod body 31a has a diameter D4 and knots 31b formed on its outer periphery at a pitch P1 in a spiral pattern, e.g., a right-handed thread, at a pitch P1. In cross section, the rod body 31a has opposing flat sides (first and second opposite sides 31c and 31d) and opposing arc-shaped sides (third and fourth opposite sides 31e and 31f) with the same radius. The anchor rod 31 has threaded joints 31g formed on the surfaces of the third and fourth opposite sides 31e and 31f, with helical knots 31b protruding at a pitch P1. The outer diameter of the threaded joints 31g is D5.

[0095] The screwing body 32 is formed by spirally winding a wire rod with a circular cross-section in a clockwise direction with a plurality of turns while having a gap, and includes a cylindrical screwing body main body portion 32A that forms a circular inner peripheral portion, a first arm portion 32B extending from a first terminal wire 32a at one end side terminal of the screwing body main body portion 32A, and a second arm portion 32C extending from a second terminal wire 32b at the other end side terminal of the screwing body main body portion 32A. As the wire rod of the screwing body main body portion 32A, an iron wire, a steel wire (such as a stainless steel wire, a zinc-plated steel wire, a zinc-aluminum-plated steel wire, etc.) is used.

[0096] The pitch of the screwing body main body portion 32A is set to the same value as or slightly larger than the pitch P1 of the screw bush 31g. Both ends of the screwing body main body portion 32A are in a form in which the first terminal wire 32a and the second terminal wire 32b are open (hereinafter referred to as an open end).

[0097] The screwing body 32 is screwed into the upper end of the anchor rod 31. Let the inner diameter of the screwing body main body portion 32A be D6, the outer diameter be D7, and the wire diameter of the wire rod be dw. The inner diameter D6 is set to be larger than the diameter D4 of the rod main body 31a of the anchor rod 31 and smaller than the bush outer diameter D5 (D4 < D6 < D5). The wire diameter dw of the wire rod of the screwing body 32 is set to be smaller than the pitch P1 so that adjacent wires do not contact each other in each turn and form a tight winding. Since the joint 31b of the anchor rod 31 has a trapezoidal cross-section, if the inner diameter of the screwing body main body portion 32A is increased, a gap will occur between the wire on the inner peripheral surface side of the screwing body main body portion 32A and the joint 31b. Also, if the wire diameter dw of the wire rod is decreased, the gap between the wire and the joint 31b will further expand. In the present embodiment, the wire diameter dw of the screwing body main body portion 32A is set so that the screwing body 32 has play in the radial direction and the axial direction with respect to the anchor rod 31. Therefore, the screwing body 32 can be screwed onto the anchor rod 31 simply by gently holding and turning the first arm portion 32B and the second arm portion 32C by hand.

[0098] The washer coil 33 is formed in a coil spring shape by spirally winding a wire rod such as iron a plurality of times, and has an inner diameter that is smaller than the maximum outer diameter including the first arm portion 32B and the second arm portion 32C of the screwing body 32 and larger than the outer diameter of the anchor rod 31.

[0099] The diamond-shaped wire mesh 10a of the spiral cylindrical structure 10 constituting the environmental conservation material 1 is inserted into the tip of the anchor rod 31, the lower part of which is driven into the ground, and penetrates the mesh, thereby grounding the environmental conservation material 1 to the ground G. Next, the washer coil 33 is inserted into the tip of the anchor rod 31 and threaded from the top of the environmental conservation material 1 into the spiral cylindrical structure 10, weaving through the mesh of the diamond-shaped wire mesh 10a of the environmental conservation material 1. The washer coil 33 does not necessarily have to be screwed into the spiral cylindrical structure 10 over its entire length; for example, the upper end of the washer coil 33 may protrude upward from the upper end of the spiral cylindrical structure 10. Finally, the screw body 32 is screwed into the upper end of the anchor rod 31 until it reaches the upper end of the washer coil 33. This support method is called a direct support method.

[0100] The washer coil 33 is caught on the first arm portion 32B and the second arm portion 32C of the screw body 32 and is prevented from slipping out from the tip of the anchor rod 31. As a result, the environmental conservation material 1 is supported on the anchor rod 31 without slipping out. Furthermore, because the washer coil 33 is loosely fitted into the anchor rod 31, the environmental conservation material 1 can move around the anchor rod 31. Therefore, when a rock, driftwood, or the like collides with the environmental conservation material 1, the environmental conservation material 1 moves and absorbs the impact force of the collision, preventing damage to the environmental conservation material 1.

[0101] Figure 8A(b) shows a case where the first connecting unit 2 shown in Figure 4 is supported by an anchor device 30. The anchor device 30 is disposed at the outer end of the winding axis direction of the first environment conservation material 1A and the second environment conservation material 1B that make up the first connecting unit 2. The first connecting unit 2 is installed with the hinge member 20 of the first connecting unit 2 on the downstream side of the inclined surface on which it is installed.

[0102] Furthermore, if the hinge member 20 of the first connecting unit 2 is oriented toward the upstream side of the slope on which it is to be installed, the first environmental conservation material 1A and the second environmental conservation material 1B can be installed in a V-shape with the hinge member 20 as the bending point. Note that anchor devices 30 may also be placed on the butt end sides of the first environmental conservation material 1A and the second environmental conservation material 1B.

[0103] FIG. 8B(a) shows the second connection unit 3 shown in FIG. 5 supported by an anchor device 30. The second connection unit 3 is configured by connecting the first environmental conservation material 1A, the second environmental conservation material 1B, and the third environmental conservation material 1C with a wire rope 21a equipped with a wire course 21c. The anchor rods 31 of the anchor device 30 are driven into the ground on both lateral sides of the second connection unit 3, or on both lateral sides of the second connection unit 3 upstream of the installation position of the second connection unit 3. The wire courses 21c attached to both ends of the wire rope 21a are inserted into the left and right anchor rods 31 from their upper ends. Furthermore, a washer coil 33 is inserted onto the wire course 21c from the upper end of the anchor rod 31, and finally, a screw 32 is screwed onto the top of the anchor rod 31. This support method is called a wire rope support method.

[0104] Because the wire course 21c is fixed to the wire rope 21a, the wire course 21c does not slip out of the washer coil 33, and the second connecting unit 3 is supported by the anchor rod 31. Furthermore, because the washer coil 33 has a compression spring configuration, if a rock, driftwood, or the like strikes all or part of the first to third environmental conservation materials 1A to 1C that make up the second connecting unit 3 and the second connecting unit 3 is swept downstream, the wire rope 21a is pulled, causing the wire course 21c to suddenly move toward the upper end of the anchor rod 31. At this time, the washer coil 33 is pushed up by the wire course 21c and contracts, absorbing the sudden movement of the wire course 21c and preventing the first to third environmental conservation materials 1A to 1C from being deformed by a large impact force via the wire rope 21a.

[0105] In addition, the second connecting unit 3 has both left and right ends of the wire rope 21a supported by anchor rods 31, allowing the first environmental conservation materials 1A to 1C to swing left and right and up and down, so that the first environmental conservation materials 1A to 1C can absorb the impact force caused by collisions with rocks, fallen trees, etc. flowing from upstream as a whole, dispersing the impact force caused by the collision and preventing damage to the first environmental conservation materials 1A to 1C.

[0106] 8B(b) shows the case where the third connection unit 4 shown in FIG. 6(b) is supported by anchor devices 30. The first to third environmental conservation materials 1A to 1C of the third connection unit 4 are supported by anchor devices 30 provided at both ends of each of the environmental conservation materials 1A to 1C in the winding axis direction. Note that if the ground conditions where the anchor rods 31 are driven are such that the ground is soft or rock is present or exposed at the position where the anchor rods 31 are driven, the driving position of the anchor rods 31 may be changed and the anchor rods 31 may be driven into the butt joint between the first environmental conservation material 1A and the second environmental conservation material 1B, or into the butt joint between the second environmental conservation material 1B and the third environmental conservation material 1C.

[0107] As shown in Figures 8A and 8B, when one environmental conservation material 1 and the first to third connecting units 2 to 4 are installed in the environmental conservation material installation area, supported by the anchor device 30, stones, fallen leaves, branches, etc., carried along with water pass through the diamond-shaped wire mesh 10a of the spiral cylindrical structure 10 or are caught on the rows of the diamond-shaped wire mesh 10a, gradually filling the spiral cylindrical space layer 13 with stones, etc. As stones, etc., naturally fill the spiral cylindrical space layer 13, water passes through the spiral cylindrical space layer 13 filled with stones, etc., and flows downstream, but the movement of stones, etc. is blocked. Furthermore, soil, sand, stones, and other sediment accumulate upstream of the installation location of the spiral cylindrical structure 10. As a result, scouring by gravel, etc. is prevented downstream of the spiral cylindrical structure 10, and soil outflow is prevented upstream. Sixth embodiment

[0108] FIG. 10 shows a sixth embodiment.

[0109] When installing one environmental conservation material 1 and the first to third connection units 2 to 4 on sloping ground, the installation state will differ depending on the condition of the sloping ground. Figure 10 is a schematic diagram showing the side of the slope along the slope direction, taking the third connection unit 4 as an example. Note that one environmental conservation material 1, the first connection unit 2, and the second connection unit 3 are installed in the same way.

[0110] FIG. 10(a) shows a case where the slope 41 of the environment conservation material installation area 40 continues for a long time, and the third connection units 4 are installed at predetermined intervals L along the slope direction.

[0111] 10(b) shows a case where slopes 42a, 42b, and 42c continue in multiple stages in the environmental conservation material installation area 40. The third connection unit 4 is installed at the downstream end of the slope, which is the tip of the slopes 42a, 42b, and 42c (just before the slope angle changes). In this case, the third connection unit 4 is installed at a position away from wall surfaces 42d and 42e, and soil, sand, and gravel accumulate between them.

[0112] Figure 10(c) shows a case where a steeply sloping wall 43b is located upstream of a slope 43a in the environmental conservation material installation area 40. The third connecting unit 4 is installed on the slope 43a near the boundary with the steeply sloping wall 43b. In this case, water flows down the upstream slope 43c that continues from the top of the wall 43b, creating a waterfall-like effect and scouring the area where it falls. The third connecting unit 4 acts as a water cushion when installed in an area where scouring is likely to occur. Gravel and other debris that flows down with the water fills the spiral tubular space layer 13 of the spiral tubular structure 10, absorbing the impact of the falling water. Furthermore, because the environmental conservation material 1 supports the spiral tubular structure 10 with tension coils 14, deformation of the spiral tubular structure 10 due to the impact force of the waterfall-like waterfall and falling gravel and fallen trees can be prevented. The third connecting unit 4 is installed at the ends of the slopes 43b and 43c, as shown in Figure 10(b). Seventh embodiment

[0113] Figure 11 shows a seventh embodiment. Figure 11 is a schematic diagram showing a method of installing environmental conservation materials, such as one environmental conservation material 1, a first connection unit 2 to a third connection unit 4, etc. The environmental conservation material installation area 40 is assumed to have a narrow upstream area 40b on the upstream side of the valley 40a, with the width of the valley 40a widening toward the downstream. The right wall surface 40c of the valley 40a is assumed to have a steep slope, for example, and to exist downstream from the top of the valley 40a. A midstream area 40d exists below the upstream area 40b, and a downstream area 40e exists below the midstream area 40d.

[0114] In the upstream area 40b of the valley 40a, one environmental conservation material 1 (referred to as a first construction section 51) is installed with its winding axis oriented in the width direction of the valley 40a. Anchor devices 30 are provided at appropriate intervals on both ends of each environmental conservation material 1 in the winding axis direction, and a direct support system is used in which the diamond-shaped wire mesh 10a of the spiral cylindrical structure 10 is inserted into the anchor rods 31 of the anchor devices 30. In the upstream area 40b, a first connecting unit 2 (referred to as a second construction section 52) is installed below the one environmental conservation material 1. The first connecting unit 2 is suitable for transporting to the upstream area 40b, which is a high point in the environmental conservation material installation area 40. The first connecting unit 2 is supported by anchor devices 30 provided at appropriate intervals on the outside of the first connecting unit 2 in the width direction, and by a wire rope support system using a wire rope 21a with wire courses.

[0115] Furthermore, in the upstream area 40b, one third connection unit 4 (referred to as third construction unit 53) is installed below the second construction unit 52. The third connection unit 4 of the third construction unit 53 is supported by a wire rope support system. In this case, the first environmental conservation material 1A and the third environmental conservation material 1C of the third connection unit 4 are bent relative to the second environmental conservation material 1B by the joint member 23. The first environmental conservation material 1A, the second environmental conservation material 1B, and the third environmental conservation material 1C can be bent using the coil-shaped joint member 23 that connects them to each other as a fulcrum. Therefore, the orientation of the first environmental conservation material 1A, the second environmental conservation material 1B, and the third environmental conservation material 1C can be adjusted to match the direction of the water flow.

[0116] At the most downstream end of the upstream area 40b, two third connection units 4 are installed in series (referred to as a fourth construction section 54). In the fourth construction section 54, the two third connection units 4 are supported by anchor devices 30 and wire ropes 21a with wire courses, which are arranged at appropriate intervals in the width direction of the valley section 40a using a wire rope support system.

[0117] Next, three third connection units 4 are installed in series in the midstream section 40d (referred to as the fifth construction section 55). In the fifth construction section 55, the three third connection units 4 are supported by anchor devices 30 using a direct support method. Compared to the fourth construction section 54, the width of the valley section 40a in the fifth construction section 55 is wider, so the work of installing three third connection units 4 in series using a wire rope support method with one wire rope 21a with wire courses threaded in advance is laborious. In contrast, the direct support method using anchor devices 30 simplifies the work because support work is performed for each third connection unit 4.

[0118] Four third connection units 4 are installed in series in the downstream area 40e (referred to as a sixth construction section 56). In the sixth construction section 56, each third connection unit 4 is supported by an anchor device 30 using a direct support method. Five third connection units 4 (4A-4E) are installed below the sixth construction section 56 in the downstream area 40e (referred to as a seventh construction section 57). The installation area for the seventh construction section 57 has a wide valley 40a and a gentle slope. The installation area for the seventh construction section 57 does not hinder installation work using the wire rope method. However, because the valley 40a is wide, the five third connection units 4A-4E are supported using two wire rope support systems to distribute and absorb pressure applied to the third connection units 4A-4E by flowing water, gravel, fallen trees, etc. The first system of wire rope support is composed of a wire rope 21a with wire courses that connects the five third connection units 4A to 4E in series, and first anchor devices 30A that are provided at appropriate intervals on the outside of the winding axis direction of the first connection unit 4A and the fifth connection unit 4E. The second system of wire rope support is composed of a wire rope 21a with wire courses that connects the central three third connection units 4B to 4D in series, and second anchor devices 30B that are provided at appropriate intervals on the outside of the winding axis direction of the third connection unit 4B and the third connection unit 4D.

[0119] For example, on the steeply inclined right wall surface 40c, third connection units 4 are installed in series along the lower end of the right wall surface 40c located to the right of the valley portion 40a (referred to as an eighth construction section 58). In the eighth construction section 58, each third connection unit 4 is supported using a wire rope support system. In this case, the anchor device 30 installed between each third connection unit 4 is shared, and a single anchor rod 31 is inserted through the lower wire course 21c of the wire rope 21a passing through the upstream third connection unit 4 and the upper wire course 12c of the wire rope 21a passing through the downstream third connection unit 4. Furthermore, the anchor device 30A installed at the right end of the seventh construction section 57 can also be shared with the anchor device installed in the eighth construction section 58. Although the right wall surface 40c is inclined steeply, it may also be inclined gently.

[0120] In the first to eighth construction sections (51 to 58), the third connection unit 4 is supported, for example, by a direct support method and a wire rope support method, but depending on the ground conditions at the installation location, it may be difficult to drive the anchor rod 31. In such cases, the direct support method is changed to the wire rope support method, the anchor rod 31 is driven into a location where it can be driven, and the wire course 21c of the wire rope 21a is inserted into the anchor rod 31. Conversely, the wire rope support method may be changed to the direct support method. Eighth embodiment

[0121] FIG. 12 shows an eighth embodiment.

[0122] When the environmental conservation material 1 is installed in a designated position in the environmental conservation area, because the environmental conservation material 1 has a skeleton structure, even if even a small amount of soil and gravel accumulates inside the spiral cylindrical space layer 13 of the spiral cylindrical structure 10, the soil and gravel inside the spiral cylindrical space layer 13 will connect, and the bottom of the environmental conservation material 1 will become buried. As a result, movement of the environmental conservation material 1 in the up / down, left / right, and front / back directions is restricted, and the material is installed stably in the installation position. Even if only a small amount of soil and gravel accumulates inside the spiral cylindrical space layer 13, plant seeds floating on the wind will germinate if they adhere to the layer, and vegetation will be restored.

[0123] The configuration of the environmental conservation material 100 of this embodiment will be described based on the development view of the environmental conservation material 100 shown in Fig. 12. The configuration of the environmental conservation material 100 is basically the same as that of the environmental conservation material 1 shown in Figs. 1A and 1B, with a tortoiseshell wire mesh 15 attached to the inner periphery within a predetermined length range from the winding end 10d of the diamond-shaped wire mesh 10a, which forms the outermost periphery of the spiral cylindrical structure 10 (Fig. 12 is a development view and cannot be depicted; see Figs. 1A and 1B). The mesh size of the tortoiseshell wire mesh 15 is smaller than the mesh size of the diamond-shaped wire mesh 10a.

[0124] The environmental conservation material 100 is installed in the environmental conservation area with the area where the tortoiseshell wire mesh 15 is attached as the bottom. When the environmental conservation material 100 is installed on soft, sloping ground such as sand, sand and other particles will enter the spiral cylindrical space layer 13 from the upstream side of the installation area through the diamond-shaped wire mesh 10a on the front side. The mesh size of the tortoiseshell wire mesh 15 attached to the inside of the diamond-shaped wire mesh 10a corresponding to the bottom of the spiral cylindrical structure 10 is smaller than that of the diamond-shaped wire mesh 10a, so sand and other particles naturally accumulate on the tortoiseshell wire mesh 15, connecting with the ground where the tortoiseshell wire mesh 15 is installed and burying it. This phenomenon can be explained by the natural collapse of the surrounding area of ​​a shallow hole when it is dug in a sandbox or the like, burying the hole.

[0125] The environmental conservation material 100 of the eighth embodiment can be configured in a connected manner similar to the above-described first connecting unit 2 to third connecting unit 4. Furthermore, the multiple environmental conservation materials that make up the connecting unit may be configured by combining environmental conservation materials 1 that are not equipped with tortoiseshell wire mesh 15 with environmental conservation materials 100 that are equipped with tortoiseshell wire mesh 15.

[0126] In addition, in the diagram explaining the construction method shown in Figure 11, the environmental conservation material used in each construction section 51 to 58 can be environmental conservation material 100 equipped with tortoiseshell wire mesh 15 depending on the condition of the installation ground. Ninth embodiment

[0127] FIG. 13 shows a ninth embodiment of the environmental conservation material according to the present invention.

[0128] The environmental conservation material 101 of this embodiment has a parallel connection configuration in which a large-diameter environmental conservation material part 101A, which is the first environmental conservation material part, and a small-diameter environmental conservation material part 101B, which is the second environmental conservation material part, are connected side by side and integrated, with the same structure as the environmental conservation material 1 shown in the first embodiment but with different outer diameters.The same names and symbols are used for the same parts as the environmental conservation material 1 shown in Figures 1A, 1B, 2A, and 2B, and their descriptions are omitted.

[0129] The outer diameter of the spiral cylindrical structure 110 constituting the large-diameter environmental conservation material part 101A is larger than the outer diameter of the spiral cylindrical structure 111 constituting the small-diameter environmental conservation material 101B. The winding end 110b of the diamond-shaped wire mesh 110a of the large-diameter spiral cylindrical structure 110 is not fixed to the outermost diamond-shaped wire mesh 110a, and is left open. The winding end 111b of the diamond-shaped wire mesh 111a of the small-diameter spiral cylindrical structure 111 is not fixed to the outermost diamond-shaped wire mesh 111a, and is left open. The mesh size of the diamond-shaped wire mesh 110a of the large-diameter spiral cylindrical structure 110 is larger than the mesh size of the diamond-shaped wire mesh 111a of the small-diameter spiral cylindrical structure 111.

[0130] In this embodiment, the environmental conservation material 101 is installed with a large-diameter environmental conservation material section 101A on the upstream side of an inclined surface 44 having an inclination angle of, for example, 45° or more, and a small-diameter environmental conservation material section 101B on the downstream side. The large-diameter environmental conservation material section 101A and the small-diameter environmental conservation material section 101B are supported on the installation ground G by anchor devices (not shown). The large-diameter environmental conservation material section 101A is installed on the installation ground G with its winding end 110b facing the bottom side and downstream of the incline, and the small-diameter environmental conservation material section 101B is installed with its winding end 111b facing the top side and upstream of the incline.

[0131] When the large-diameter environmental conservation material section 101A and the small-diameter environmental conservation material section 101B are installed on the installation ground G, the ends of the multiple tension coils 14 face each other with a gap between them, and are connected by a connecting coil 16 in the shape of a coil spring, which serves as a connecting member. Before connecting the ends of the connecting coil 16 to the opposing ends of the tension coils 14, the winding end 110b of the diamond-shaped wire mesh 110a of the large-diameter spiral cylindrical structure 110 is fixed to the diamond-shaped wire mesh 111a at the outermost periphery of the small-diameter spiral cylindrical structure 111. Finally, the winding end 111b of the small-diameter spiral cylindrical structure 111 is fixed to the diamond-shaped wire mesh 110a at the outermost periphery of the large-diameter spiral cylindrical structure 110. As a result, the large-diameter environmental conservation material section 101A and the small-diameter environmental conservation material section 101B are integrated in a parallel state by the connecting section 102.

[0132] The falling speed of soil, gravel, etc. flowing with water down the steeply inclined slope 44 is high, and soil, gravel, etc. that hits the large-diameter environmental conservation material section 101A located upstream of the environmental conservation material 101 is unlikely to accumulate upstream of the large-diameter spiral cylindrical structure 110. Because the mesh size of the diamond-shaped wire mesh 110a of the large-diameter spiral cylindrical structure 110 is large, some of the large-sized gravel, etc. fills the large-diameter spiral cylindrical structure 110, while the rest passes through the large-diameter spiral cylindrical structure 110. At this time, the moving speed of the gravel, etc. is reduced and it heads toward the small-diameter environmental conservation material section 101B downstream. As the speed of movement of the soil, gravel, etc. heading toward the small-diameter environmental conservation material section 101B decreases, two types of flow occur: one in which the soil falls and accumulates in the void 103 below through the upstream connecting section 102 of the diamond-shaped wire mesh 111a of the small-mesh spiral cylindrical structure 111, and the other in which the soil, gravel, etc. heading toward the small-diameter spiral cylindrical structure 111. The soil, gravel, etc. that flows into the small-diameter spiral cylindrical structure 111 begins to fill up the small-diameter spiral cylindrical structure 111, and only the water is discharged downstream. When the soil, gravel, etc. that has begun to accumulate in the void 103 accumulates enough to fill the connecting section 102, the large-diameter environmental conservation material section 101A and the small-diameter environmental conservation material section 101B become more firmly integrated.

[0133] The environmental conservation material 101 of this embodiment further exhibits the function of reducing the flow rate of sediment and gravel through the large-diameter environmental conservation material section 101A, thereby preventing damage to the small-diameter environmental conservation material section 101B. Additionally, the large-diameter environmental conservation material section 101A performs primary filtering to block large-diameter stones, driftwood, and the like, and the small-diameter environmental conservation material 101B performs secondary filtering of the relatively small-diameter stones and other sediment and gravel that have passed the primary filtering, thereby efficiently discharging water downstream.

[0134] The environmental conservation material 101 of this embodiment can be used not only on steeply inclined surfaces but also on gently inclined surfaces.

[0135] In this embodiment, the spiral cylindrical structures 110 and 111 have different outer diameters, but they may have the same diameter.

[0136] For the environmental conservation materials 1, 100, and 101 of each of the above-described embodiments, it is preferable to use wire material with excellent rust resistance and anti-rust treated materials, and similarly, it is preferable to use wire material with excellent rust resistance and anti-rust treated materials for the anchor rod 31, threaded body 32, and washer coil 33 that constitute the anchor device 30. [Explanation of symbols]

[0137] 1, 100, 101: Environmental conservation materials 1A: No. 1 environmental conservation materials 1B: 2nd environmental conservation material 1C: 3rd environmental conservation material 2: 1st connecting unit 3: 2nd connecting unit 4 (4A~4E): 3rd connecting unit 10, 110, 111: spiral cylindrical structure 10a, 110a, 111a: diamond-shaped wire mesh 10b: Row line 10c: V-shaped part 10d, 110b, 111b: End of winding 11: central space portion 12: core member (core coil) 13: spiral cylindrical space layer 14: Spatial layer holding member (tension coil) 15: Tortoiseshell wire mesh 16: Connection coil 20: Hinge member (hinge coil) 21: Connecting member 21a: Wire rope 21b: End 21c: Wire course 22: Iron bar 23: Fixed coil 23a: Tip terminal 23b: Base terminal 30: Anchor device 30A: First anchor device 30B: Second anchor device 31: Anchor rod 31a: Rod body 31b: Joint 31c: First opposite side 31d: Second opposite side 31e: Third opposite side 31f: Fourth opposite side 31g: screw joint 32: screw body 32A: screw body main body 32B: first arm 32C: Second arm portion 32a: First terminal wire rod 32b: Second terminal wire rod dw: Wire diameter 33: Washer coil 40: Environmental conservation material installation area 40a: Valley area 40b: Upstream area 40c: Right wall 40d: Middle area 40e: Downstream area 41, 42a, 42b, 42c, 43b, 43c, 44: Slope 42d, 42e: Wall 43b: Wall 51: 1st construction department 52: 2nd construction department 53: 3rd construction department 54: 4th construction department 55: 5th Construction Department 56: 6th Construction Department 57: 7th Construction Department 58: 8th Construction Department 101A: Large-diameter environmental conservation materials section 101B: Small-diameter environmental conservation materials section 102: Connection part 103: Void G: Installation ground

Claims

1. This is an environmental conservation material that allows soil, gravel, etc. that flows into the internal space to be filled later and allows water that flows into the internal space to be drained, a spiral cylindrical structure in which a mesh member is wound in a side spiral shape in a plurality of turns with the width direction as the winding axis direction, a central space portion of a predetermined diameter is formed at the winding start end along the winding axis direction, and a spiral cylindrical space layer of a predetermined thickness is formed in a spiral shape between the mesh portion on the inner periphery side and the mesh portion on the outer periphery side in the radial direction; a hollow core member disposed in the central space along the winding axis direction and maintaining an inner diameter of the central space; a plurality of spiral-shaped space layer retaining members arranged at appropriate intervals along the axial direction within the spiral cylindrical space layer, the space layer retaining members having a spiral side shape, which are in contact with the arc-shaped inner peripheral convex mesh portion and the arc-shaped outer peripheral concave mesh portion of the spiral cylindrical space layer along the winding direction to maintain a predetermined thickness of the spiral cylindrical space layer; Environmental conservation materials.

2. The environmental conservation material according to claim 1, The mesh member is a diamond-shaped wire mesh, the row line direction being the width direction, and the parallel arrangement direction of the row lines being the winding direction.

3. The environmental conservation material according to claim 1 or 2, The space layer retaining member is an environmental conservation material characterized in that it is formed in a spiral shape from a wire material.

4. The environmental conservation material according to any one of claims 1 to 3, The environmental conservation material is characterized in that the multiple spatial layer retaining members are composed of end-side spatial layer retaining members that are arranged at both ends of the width of the mesh member, and one or more intermediate spatial layer retaining members that are arranged between the end-side spatial layer retaining members.

5. The environmental conservation material according to claim 4, An environmental conservation material characterized in that a portion of the space layer retaining member on the end side in the width direction protrudes outward in the width direction beyond the outer end of the mesh member in the width direction.

6. The environmental conservation material according to any one of claims 1 to 5, The space layer retaining member is an environmental conservation material characterized in that it is composed of a plurality of members connected in series.

7. The environmental conservation material according to any one of claims 3 to 6, The space layer retaining member is formed in a spiral shape from a wire rod, and the end portion on the spiral center side is formed in an end-wound shape.

8. The environmental conservation material according to any one of claims 1 to 7, The environmental conservation material is characterized in that the core member is formed in a spiral shape from a wire material.

9. The environmental conservation material according to claim 8, An environmental conservation material characterized in that the outer diameter of the core member is larger than the outer diameter of the space layer retaining member.

10. The environmental conservation material according to any one of claims 1 to 9, This environmental conservation material is characterized in that a tortoiseshell wire mesh is provided on the inside of the end of the winding of the mesh member that constitutes the spiral cylindrical structure, with the same width as the width of the mesh member, and the mesh size of the tortoiseshell wire mesh is smaller than the mesh size of the mesh member.

11. 11. An environmental conservation material having a parallel connection configuration, in which the environmental conservation materials according to any one of claims 1 to 10 are connected in parallel as a first environmental conservation material part and a second environmental conservation material part, respectively, and integrated together, An environmental conservation material characterized in that the first environmental conservation material section and the second environmental conservation material section are arranged side by side so that the winding end of the spatial layer retaining member of the first environmental conservation material section faces the winding end of the spatial layer retaining member of the second environmental conservation material section, the opposing winding ends are connected to each other by a connecting member, the winding end of the mesh member that forms the spiral tubular structure of the first environmental conservation material section is fixed to the outermost mesh member that forms the spiral tubular structure of the second environmental conservation material section, and the winding end of the mesh member that forms the spiral tubular structure of the second environmental conservation material section is fixed to the mesh member that forms the spiral tubular structure of the first environmental conservation material section.

12. The environmental conservation material according to claim 11, An environmental conservation material characterized in that the outer diameter of the spiral cylindrical structure of the first environmental conservation material section is larger than the outer diameter of the spiral cylindrical structure of the second environmental conservation material section, and the mesh size of the mesh member constituting the spiral cylindrical structure of the first environmental conservation material section is larger than the mesh size of the mesh member constituting the spiral cylindrical structure of the second environmental conservation material section.

13. an environmental conservation material train in which a plurality of environmental conservation materials according to any one of claims 1 to 10 are arranged in series along the winding axis direction; a joint member that connects opposing ends of the environmental conservation materials so that adjacent environmental conservation materials in the row can be folded; A connecting unit of environmental conservation materials.

14. an environmental conservation material train in which a plurality of environmental conservation materials according to any one of claims 1 to 10 are arranged in series along the winding axis direction; a fixed coil that is screwed into the mesh portions of the opposing ends of adjacent environmental conservation materials in the row of environmental conservation materials to connect the environmental conservation materials together; A connecting unit of environmental conservation materials.

15. A method for installing environmental conservation materials, characterized in that when the installation area where the environmental conservation material described in any one of claims 1 to 10 or the connecting unit described in claim 13 or 14 is to be installed has a long slope, the environmental conservation material or the connecting unit is installed at predetermined intervals along the slope direction.

16. A method for installing environmental conservation materials, characterized in that when the installation area in which the environmental conservation material described in any one of claims 1 to 10 or the connecting unit described in claim 13 or 14 is to be installed has a slope that continues over multiple levels, the environmental conservation material or the connecting unit is installed at the downstream end of the slope of each of the slopes.

17. A method for installing an environmental conservation material, characterized in that when the slope of the installation area where the environmental conservation material described in any one of claims 1 to 10 or the connecting unit described in claim 14 is installed is located downstream from a steeply sloping wall, the environmental conservation material or the connecting unit is installed on the slope near the boundary with the wall.

18. A method for installing environmental conservation materials, characterized in that when the installation area where the environmental conservation material described in claim 12 is installed has a steep slope, the first environmental conservation material section is installed on the upstream side and the second environmental conservation material section is installed on the downstream side.

19. When the installation area for installing the environmental conservation material according to any one of claims 1 to 10 or the connecting unit according to claim 13 or 14 is a valley, an installation method for environmental conservation material is characterized in that anchor devices are placed in advance at appropriate intervals on the ground in the width direction of the valley, and the environmental conservation material or the connecting unit is directly attached to the anchor devices.

20. When the installation area for installing the environmental conservation material according to any one of claims 1 to 10 or the connecting unit according to claim 13 or 14 is a valley, a method for installing the environmental conservation material is characterized in that anchor rods are placed in advance at appropriate intervals on the ground in the width direction of the valley, and both ends of a wire rope that has been passed through the environmental conservation material or the connecting unit in advance are attached to the anchor rods.

21. When the installation area in which the environmental conservation material according to any one of claims 1 to 10 or the connecting unit according to claim 13 or 14 is to be installed is a wall surface that is continuous with the end of a valley in the width direction and runs from the upstream side to the downstream side of the valley, a method for installing an environmental conservation material, characterized by: arranging anchor rods in advance at the lower end of the wall surface along the upstream side to the downstream side at appropriate intervals; and attaching both ends of a wire rope that has been passed through the environmental conservation material or the connecting unit in advance to the anchor rod, or directly attaching the environmental conservation material or the connecting unit to the anchor rod.

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