Rockfall prevention structure

Abstract

To provide a rockfall prevention structure having high safety and reliability, capable of enhancing the strength of a net material around an opening part even when the opening part for avoiding an obstacle such as a tree on an inclined surface is formed in the net material, and capable of suppressing a situation in which the net material is bent and broken by a load of captured rockfall.SOLUTION: A rockfall prevention structure is installed on an inclined surface. The rockfall prevention structure has an opening to avoid obstacles on the sloping surface and is provided with netting covering the sloping surface and reinforcing members surrounding the opening to reinforce the netting.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rockfall prevention structure to be installed on a slope where there is a risk of rockfall. [Background technology]

[0002] Generally, rockfall prevention structures are installed on slopes of mountains etc. where there is a risk of rockfall, to prevent disasters caused by rockfall. For example, Patent Document 1 discloses an example of such a rockfall prevention structure, a rockfall prevention net that includes a net material to be installed on the slope of a target area, a main wire material consisting of vertical and horizontal ropes that reinforce and hold down the net material, connecting members that connect the net material and the main wire material to each other, and anchors for installation on the slope.

[0003] On the slopes of mountains, etc., there are trees and other obstacles that can become obstacles when installing rockfall prevention structures. Small trees that do not affect the ground can be cut down. However, large trees cannot be cut down because they may affect the ground and cutting them down would loosen and make the ground unstable. Therefore, when installing rockfall prevention netting on a slope that has obstacles such as large trees that can affect the ground, it is common to form openings in the netting material to avoid the obstacles. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-71211 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, forming an opening in the net material reduces the strength of the net material around the opening, and therefore, in conventional rockfall prevention structures such as the rockfall prevention net disclosed in Patent Document 1, the net material may bend and break under the weight of the captured falling rocks.

[0006] The present invention is devised to solve the above-mentioned problems, and aims to provide a safe and reliable rockfall prevention structure that can increase the strength of the mesh material around the openings formed in the mesh material to avoid obstacles such as trees on a slope, thereby preventing the mesh material from bending and breaking under the weight of captured falling rocks. [Means for solving the problem]

[0007] The rockfall prevention structure according to the present invention is a rockfall prevention structure to be installed on a slope, and has an opening for avoiding obstacles on the slope, a net material covering the slope, and a reinforcing member surrounding the periphery of the opening for reinforcing the net material. a main wire connected to the net material; a fixing member for fixing the net material and the main wire to the inclined surface; and a support member for connecting the reinforcing member and the main wire. Equipped with The support member includes a plate member disposed between the reinforcing member and the main wire, and a joining member that joins the plate member to the reinforcing member and the plate member to the main wire. It is something. In addition, the rockfall prevention structure of the present invention is a rockfall prevention structure installed on a slope, having an opening to avoid obstacles on the slope, and comprising a mesh material covering the slope, a reinforcing member surrounding the opening and reinforcing the mesh material, a main wire material connected to the mesh material, a fixing member fixing the mesh material and the main wire material to the slope, and a support member connecting the reinforcing member and the main wire material, wherein the support member is a wire rope. In addition, the rockfall prevention structure of the present invention is a rockfall prevention structure installed on a slope, having an opening to avoid obstacles on the slope, and comprising a mesh material covering the slope, and a reinforcing member surrounding the opening and reinforcing the mesh material, the reinforcing member being made of wire and shaped like a ring so as to surround the opening of the mesh material, with both ends connected by connecting members. Effect of the Invention

[0008] The rockfall prevention structure according to the present invention includes a reinforcing member that surrounds the opening formed in the net material and reinforces the net material, thereby increasing the strength of the net material around the opening and allowing the net material to safely hold falling rocks. This prevents the net material from bending or breaking due to the load of the captured falling rocks, and allows for a safe and reliable structure to be realized. [Brief description of the drawings]

[0009] [Figure 1] 1 is an explanatory diagram showing a state in which a rockfall prevention structure according to an embodiment of the present invention is installed on a slope of a mountain or the like. [Diagram 2] 1 is a front view showing a rockfall prevention structure according to an embodiment of the present invention; [Diagram 3] 2 is an enlarged view showing a main part of the rockfall prevention structure according to the embodiment of the present invention. FIG. [Figure 4] 13 is an explanatory diagram showing a modified example of the mesh material of the rockfall prevention structure of the embodiment. FIG. [Diagram 5]1A is a front view showing a coupling coil of a rockfall prevention structure according to an embodiment of the present invention, and FIG. 1B is a side view showing the coupling coil of the rockfall prevention structure according to an embodiment of the present invention. [Figure 6] 1 is an enlarged view of a portion of a rockfall prevention structure according to an embodiment where a joint member is provided. FIG. [Figure 7] FIG. 7 is a view taken along line Y in FIG. 6. [Figure 8] FIG. 2 is an enlarged view of part A shown in FIG. [Figure 9] 9 is an enlarged view of part B shown in FIG. 8 as viewed from above. [Figure 10] FIG. 2 is an enlarged view of part C shown in FIG. [Figure 11] 13 is an explanatory diagram showing a modified example of the fixing member of the rockfall prevention structure according to the embodiment. FIG. [Figure 12] 1 is an explanatory diagram showing an example of a reinforcing member of a rockfall prevention structure according to an embodiment of the present invention. FIG. [Figure 13] 1 is an explanatory diagram showing an example of a reinforcing member of a rockfall prevention structure according to an embodiment of the present invention. FIG. [Figure 14] 1 is an explanatory diagram showing an example of a reinforcing member of a rockfall prevention structure according to an embodiment of the present invention. FIG. [Figure 15] 1 is an explanatory diagram showing a configuration of a rockfall prevention structure according to an embodiment, which includes a support member that connects a reinforcing member and a main wire. FIG. [Figure 16] 16 is a cross-sectional side view of the support member shown in FIG. 15. [Figure 17] 11 is an explanatory diagram showing a modified example of a support member of the rockfall prevention structure according to the embodiment. FIG. [Figure 18] 13 is an explanatory diagram showing a modified example of a reinforcing member of the rockfall prevention structure according to the embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. In addition, the shape, size, arrangement, etc. of the configurations shown in each drawing may be changed as appropriate within the scope of the present invention.

[0011] Embodiment Fig. 1 is an explanatory diagram showing a rockfall prevention structure according to an embodiment installed on a slope of a mountain or the like. Fig. 2 is a front view showing a rockfall prevention structure according to an embodiment. Fig. 3 is an enlarged view showing a main part of the rockfall prevention structure according to an embodiment. Fig. 4 is an explanatory diagram showing a modified example of the net material of the rockfall prevention structure according to an embodiment.

[0012] A rockfall prevention structure 100 according to this embodiment is installed on a slope 101 of a mountain or the like where there is a risk of rockfall, in order to prevent disasters caused by falling rocks, as shown in Fig. 1. The rockfall prevention structure 100 has a mesh material 1 covering the slope 101, main wires 2 connected to the mesh material 1, and fixing members 3 for fixing the mesh material 1 and the main wires 2 to the slope 101, as shown in Figs. 1 to 3.

[0013] The mesh material 1 is a high-strength wire mesh formed by weaving a plurality of wires into a diamond shape, as shown in Fig. 3. The high-strength wire mesh is, for example, a wire having a wire diameter of about 3.2 mm and a tensile strength of 850 N / mm 2 That's all. For your information, the netting material commonly used for rockfall prevention structures has a wire diameter of about 3.2 mm and a tensile strength of 290 N / mm. 2In the rockfall prevention structure 100 of this embodiment, the net material 1 is a high-strength wire mesh, which increases the strength against the load of falling rocks. In addition, by increasing the strength of the net material 1 by using a high-strength wire mesh, the number of fixing members 3 for fixing the net material 1 to the inclined surface 101 can be reduced, so that the construction period can be shortened and the construction costs can be reduced. Note that the net material 1 is not limited to a configuration using wire material having the above-mentioned wire diameter and tensile strength, and is configured using wire material that is optimal depending on the construction situation. In addition, the net material 1 is not limited to a wire mesh, and may be configured, for example, by weaving ropes or the like into a diamond shape. Furthermore, the mesh of the net material 1 is not limited to a diamond shape, and may be, for example, a square or a rectangle.

[0014] As shown in FIG. 4, the mesh material 1 may have an angle θ of about 60 degrees in the rhombus facing the inclination direction X of the inclined surface 101. By setting the angle θ to about 60 degrees, the mesh material 1 can be made shorter in length than a mesh material having an angle of about 85 degrees in the rhombus facing the inclination direction X of the inclined surface 101. 2 This increases the number of intersections of the wires per unit area, allowing the load of falling rocks to be transmitted to the main wires 2 while being more dispersed. Also, the wire density increases, which increases the strength of the mesh material 1. In other words, by using mesh material 1 that is a high-strength wire mesh and in which the angle θ of the rhombus facing the inclination direction X of the inclined surface 101 is set to about 60 degrees, the amount of deformation due to the load of falling rocks can be suppressed, and disasters caused by falling rocks can be reliably prevented.

[0015] The main wires 2 are provided to transmit the load of the falling rocks captured by the net material 1 to the fixed member 3. As shown in Figs. 2 and 3, the main wires 2 are arranged so as to divide the net material 1 into a plurality of regions. Specifically, the main wires 2 have vertical wires 2A arranged along the inclination direction X of the inclined surface 101 and horizontal wires 2B arranged in a direction substantially perpendicular to the inclination direction X, and are arranged so as to divide the net material 1 into a square grid. The main wires 2 have, for example, a wire diameter of about 14 mm and a breaking strength of about 98 kN. Note that the main wires 2 are not limited to the above wire diameter and breaking strength, and are configured using wires that are optimal as appropriate depending on the construction situation. Incidentally, the main wires of commonly used rockfall prevention structures have, for example, a wire diameter of about 12 mm and a breaking strength of about 68.6 kN.

[0016] As shown in FIG. 3, the main wires 2 divide the net material 1 so that the vertical and horizontal dimensions S1×S2 of one square are about 2.5 m×2.5 m. For example, it is possible to increase the strength of the rockfall prevention structure 100 by making the vertical and horizontal dimensions of one square smaller than about 2.5 m×2.5 m, but this would increase the number of main wires 2, the number of fixing members 3 for fixing the main wires 2 and the net material 1, and the number of other members, which could increase construction costs and prolong the construction period. In the rockfall prevention structure 100 of this embodiment, the net material 1 made of the high-strength wire mesh described above is used, so the vertical and horizontal dimensions of one square can be increased. Therefore, the construction period during construction can be shortened and the construction costs can be reduced. The shape of the squares and the vertical and horizontal dimensions of the squares are not limited to the above configuration. The shape of the squares formed by the main wires 2 may be, for example, a rectangular shape such as a rectangle, or a triangular shape or a polygonal shape having pentagons or more sides.

[0017] FIG. 5(A) is a front view showing a coupling coil of a rockfall prevention structure according to an embodiment. FIG. 5(B) is a side view showing a coupling coil of a rockfall prevention structure according to an embodiment. As shown in FIG. 2, FIG. 3 and FIG. 5, the main wire 2 is connected to the mesh material 1 via a spiral coupling coil 4. As an example, the coupling coil 4 has a wire diameter of 3.2 mm, a length of 300 mm and an outer spiral diameter of 50 mm. In the illustrated example, four coupling coils 4 are provided on each side of the square. The coupling coil 4 is attached to the main wire 2 and the mesh material 1 by winding the coil around the main wire 2 and the mesh material 1 while rotating the coil. The dimensions and number of the coupling coils 4 are not limited to the illustrated configuration. The coupling coil 4 may have a length of one side or two or more sides of the square, for example.

[0018] Fig. 6 is an enlarged view of a portion of a rockfall prevention structure according to an embodiment where a joint member is provided. Fig. 7 is a view taken along line Y in Fig. 6. As shown in Figs. 2, 3 and 6, joint members 5 that join the main wires 2 and the fixing members 3 are provided at each point where the vertical wires 2A and the horizontal wires 2B that constitute the main wires 2 intersect.

[0019] The joint member 5 is, for example, a cross anchor clip, as shown in FIG. 6. The cross anchor clip 5 is composed of a pair of clip members 50 and 51 that clamp the main wire 2. The pair of clip members 50 and 51 are formed with two through holes 5a and 5b. The shaft portion of a bolt 52 that connects the pair of clip members 50 and 51 is screwed into one of the through holes 5a. The cross anchor clip 5 can firmly clamp the main wire 2 by tightening the bolt 52 that is passed through the through hole 5a. In addition, one end of the fixing member 3 fixed to the inclined surface 101 is inserted and fixed into the other through hole 5b. In addition, the joint member 5 is provided with a through hole 5c for passing the wire between the through hole 5a into which the bolt 52 is screwed and the through hole 5b that fixes the fixing member 3, as shown in FIG. 7.

[0020] FIG. 8 is an enlarged view of the A part shown in FIG. 1. FIG. 9 is an enlarged view of the B part shown in FIG. 8 from above. FIG. 10 is an enlarged view of the C part shown in FIG. 1. FIG. 11 is an explanatory view showing a modified example of the fixing member of the rockfall prevention structure according to the embodiment. As shown in FIG. 8 to FIG. 10, the winding grips 20 are attached to both ends of the vertical wire 2A constituting the main wire 2. The winding grips 20 are fasteners in which zinc or aluminum alloy plated steel wires formed into a spiral shape are bundled in parallel and integrated. The winding grips 20 have a ring portion 20a, and the ring portion 20a is passed through the through hole 5c of the joint member 5 and attached to the joint member 5. In other words, the vertical wire 2A is firmly held by having both ends attached to the joint member 5 via the winding grips 20. Although not shown in the figure, the horizontal wire 2B constituting the main wire 2 is also firmly held by having both ends attached to the joint member 5 via the winding grips 20. The vertical wires 2A and horizontal wires 2B are not limited to being attached to the joining member 5 via the winding grips 20 attached to both ends, but may be attached to the joining member 5 using other members.

[0021] The joint members 5 may be provided at all the locations where the main wires 2 intersect, or may be provided only at the necessary locations among the locations where the main wires 2 intersect. In short, the number and locations of the joint members 5 to be installed are appropriately selected according to the construction situation.

[0022] The fixing member 3 fixes the net material 1 and the main wires 2 to the inclined surface 101. As shown in Figs. 8 and 10, the fixing member 3 is, for example, a rock anchor for bedrock and a pipe anchor for underground, and fixes the net material 1 and the main wires 2 to the inclined surface 101 via the connecting member 5. As shown in Fig. 11, the fixing member 3 may be, for example, a pin anchor having a U-shaped hook at the top, or other well-known anchors may be selected and used depending on the ground conditions. The fixing member 3 shown in the figure is driven into the inclined surface 101, and then one end is inserted into the through hole 5b of the connecting member 5 to be fixed.

[0023] Incidentally, on a slope 101 of a mountain or the like, there are trees and the like that become obstacles when installing a rockfall prevention structure 100. Small trees that do not affect the ground can be cut off. However, large trees cannot be cut off because they may affect the ground, and cutting them down will loosen and make the ground unstable. Therefore, when installing a rockfall prevention structure 100 on a slope 101 that has obstacles 102 such as large trees that may affect the ground, it is common to form openings 10 in the net material 1 to avoid the obstacles 102, as shown in FIG. 3. However, if openings 10 are formed in the net material 1, the strength of the net material 1 decreases around the openings 10, and there is a risk that the net material 1 will bend and break under the load of the captured falling rocks.

[0024] Therefore, in the rockfall prevention structure 100 according to the present embodiment, a reinforcing member 6 is provided to surround the periphery of the opening 10 of the net material 1 and reinforce the net material 1. The opening 10 of the net material 1 is formed in one or more regions (squares) partitioned by the main wires 2. The opening 10 is formed in a size that takes into consideration the allowable life of the rockfall prevention structure 100 and the growth of the trees 102. As an example, the opening 10 is circular and formed in a size that provides a gap S of, for example, about 15 cm to 20 cm between the opening edge of the net material 1 and the trees 102. Considering that the allowable life of the rockfall prevention structure 100 is about 50 years, it is sufficient to provide a gap S of about 15 cm to 20 cm between the trees 102. The opening 10 is not limited to the rectangular shape shown in the figure, and may be, for example, circular. The opening 10 may be formed for each tree 102, or may be formed in a size that can accommodate a plurality of trees 102 together. In short, the size and shape of the opening 10 are to be appropriately changed depending on the size, shape and type of the tree 102 .

[0025] To place a tree 102 in an opening 10 of the net material 1, the mesh material 1 is unwoven around the opening 10 and divided into two pieces, and after the tree 102 is placed in the opening 10, the mesh material 1 is rewoven. The net material 1 is cut to form the opening 10. As shown in part D of Fig. 3, the end of the cut wire is knuckled and hooked onto the other intersecting wire.

[0026] For example, the reinforcing member 6 uses a wire material having the same configuration as the main wire material 2. That is, the reinforcing member 6 is configured of a wire rope having, for example, a wire diameter of 14 mm and a breaking strength of 98 kN. By using the same wire material as the main wire material 2 for the reinforcing member 6, the same wire material can be used at the construction site, reducing the work and cost of construction. Note that the reinforcing member 6 is not limited to using the same wire material as the main wire material 2, and a wire material having an optimal wire diameter and breaking strength depending on the construction situation is used.

[0027] The reinforcing member 6 is connected to the mesh material 1 via a connecting member 11. The connecting member 11 is, for example, a spiral coupling coil, and is configured to connect the reinforcing member 6 to the mesh material 1 by commonly winding the reinforcing member 6 and the mesh material 1. The coupling coil 11 has the same configuration as the coupling coil 4 shown in FIG. 5. That is, the coupling coil 11 also has, for example, a wire diameter of 3.2 mm, a length of 300 mm, and an outer spiral diameter of 50 mm. The reinforcing member 6 is connected to the mesh material 1 by the connecting member 11 that is wound together with the mesh material 1. For example, eight coupling coils 11 are provided at intervals in the circumferential direction of the reinforcing member 6. Note that the connecting member 11 is not limited to the coupling coil shown in the figure, and may be composed of other members such as wire.

[0028] 12 to 14 are explanatory diagrams showing examples of reinforcing members of a rockfall prevention structure according to an embodiment. First, the reinforcing member 6 shown in FIG. 12 will be described. FIG. 12(A) shows the reinforcing member 6 stretched to be straight. FIG. 12(B) shows the reinforcing member 6 with both ends connected by a connecting member 7 to be formed into a ring. FIG. 12(C) shows an enlarged cross section of part I in (B) seen from the side. The reinforcing member 6 shown in FIG. 12 is configured to be ring-shaped so as to surround the periphery of the opening 10 of the net material 1. The reinforcing member 6 has both ends 60 formed into ring shapes, and the both ends 60 are connected by connecting members 7 hung on the ring-shaped both ends 60. The ring-shaped both ends 60 are formed by locking processing, in which, for example, an aluminum tube 61 is put into a rope and compressed to be processed into a ring shape. The connecting member 7 is, for example, a shackle, as shown in FIG. 12(C). Note that the connecting member is not limited to a shackle, and other members may be used.

[0029] Next, the reinforcing member 6 shown in Fig. 13 will be described. Fig. 13(A) shows a state in which both ends of the reinforcing member 6 are connected by a connecting member 8 to form a ring. Fig. 13(B) shows an enlarged side view of part II shown in (A). The reinforcing member 6 shown in Fig. 13 is configured in a ring shape so as to surround the periphery of the opening 10 of the net material 1. The reinforcing member 6 has both ends 60 formed in a ring shape, and both ends 60 are connected by connecting members 8 hooked onto both ring-shaped ends 60.

[0030] The connection member 8 shown in FIG. 13 is configured to be adjustable in length in the circumferential direction. Specifically, the connection member 8 has a length adjustment member 80 configured to be adjustable in length in the circumferential direction, and a joining member 81 attached to the length adjustment member 80 and hooking the end portion 60 of the reinforcing member 6. The length adjustment member 80 has two arc-shaped steel plates 80a and 80a, and a fastening member 80c that joins the two arc-shaped steel plates 80a and 80a. Four through holes 80b are formed in each steel plate 80a along the arc direction. The two steel plates 80a and 80a are joined by overlapping parts of their planes, aligning the positions of the through holes 80b, and then by the fastening member 80c that is passed through the through holes 80b. In the illustrated example, the fastening member 80c is configured by a bolt and a nut. That is, the length adjustment member 80 is configured to be adjustable in length in the circumferential direction by changing the positions of the through holes 80b that are joined by the fastening member 80c. The steel plate 80a is not limited to the arc shape shown in the figure, and may be, for example, rectangular. The number of through holes 80b provided in the steel plate 80a is not limited to the number shown in the figure. The through holes 80b may be, for example, long holes extending in the arc direction.

[0031] The connecting member 81 is attached to both ends of the length adjustment member 80 in the arc direction. The connecting member 81 has a pair of support parts 81a fixed to one end of each steel plate 80a, and a hook part 81b fixed to the support part 81a and hooking the end 60 of the reinforcing member 6. The pair of support parts 81a are each made of a steel plate. The pair of support parts 81a are fixed by welding to both side surfaces, which are the thickness part of the steel plate 80a, so that the flat part of the pair of support parts 81a protrudes outward in the arc direction from one end of the steel plate 80a. A through hole for attaching the hook part 81b is formed in the part of the support part 81a protruding outward in the arc direction. The hook part 81b is, for example, a bolt and a nut. The hook part 81b is attached to the support part 81a by tightening the tip part of the shaft part of the bolt passed through the through hole of the support part 81a with a nut. The reinforcing member 6 is hooked to the hook portion 81b by passing the ring-shaped end portion 60 over the shaft portion of the bolt.

[0032] Next, the reinforcing member 6 shown in FIG. 14 will be described. FIG. 14(A) shows a state in which both ends of the reinforcing member 6 are connected to each other by the connecting member 9 to form a ring. FIG. 14(B) shows an enlarged cross section of the part III shown in (A) viewed from the side. The reinforcing member 6 shown in FIG. 14 differs from the reinforcing member 6 shown in FIG. 12 and FIG. 13 in that both ends 60 are not processed into a ring shape. The reinforcing member 6 has both linear ends 60 connected to each other by the connecting member 9 made of a wire grip after the size of the ring is adjusted to match the size of the opening 10. The reinforcing member 6 shown in FIG. 14 does not need to have both ends 60 processed into a ring shape in advance at a factory or the like, so a bundle of wire rope procured at the construction site can be cut to a length suitable for the size of the opening 10 and used. The connecting member 9 may be a carabiner or the like in addition to the wire grip, and any member may be used as long as it can connect both ends 60 of the reinforcing member 6. The number of connecting members 9 is not limited to two as shown in FIG. 14, and may be one or three or more.

[0033] 12 to 14, it may be, for example, a ring-shaped metal fitting, etc. In other words, the reinforcing member 6 may be of any size, shape, and material as long as it can surround the periphery of the opening 10 of the net material 1 and reinforce the net material 1.

[0034] Fig. 15 is an explanatory diagram showing a configuration of a rockfall prevention structure according to an embodiment, which includes a support member connecting the reinforcing member and the main wire. Fig. 16 is a cross-sectional view of the support member shown in Fig. 15, seen from the side. The rockfall prevention structure 100 shown in Figs. 15 and 16 is characterized by the provision of a support member 12 connecting the reinforcing member 6 and the horizontal wire 2B of the main wire 2. By providing the support member 12, the strength of the reinforcing member 6 can be increased, and falling rocks can be held more safely.

[0035] The support member 12 has one plate member 13 arranged between the reinforcing member 6 and the horizontal wire 2B, and two joining members 14 and 15 that join the plate member 13 to the reinforcing member 6 and the plate member 13 to the horizontal wire 2B, respectively. The plate member 13 is, for example, a steel plate. The joining member 14 is, for example, a U-bolt 14a and a nut 14b. The joining member 15 is, for example, a U-bolt 15a and a nut 15b. The plate member 13 has holes through which the U-bolt 14a and the shaft of the U-bolt 15a pass. One of the joining members 14 can join the plate member 13 to the reinforcing member 6 by passing the reinforcing member 6 through the groove of the U-bolt 14a and tightening the shaft of the U-bolt 14a inserted into the hole of the plate member 13 with the nut 14b. The other joining member 15 can join the plate member 13 and the horizontal wire 2B by passing the horizontal wire 2B through the groove of the U-bolt 15a and tightening the shaft of the U-bolt 15a inserted into the hole in the plate member 13 with a nut 15b.

[0036] In the illustrated embodiment, the reinforcing member 6 and the horizontal wires 2B are connected by the support member 12, but the reinforcing member 6 and the vertical wires 2A may be connected by the support member 12. The number of support members 12 is not limited to one as illustrated, and may be provided at multiple locations along the periphery of the reinforcing member 6. In this case, it is preferable to combine a support member 12 connecting the reinforcing member 6 and the horizontal wires 2B with a support member 12 connecting the reinforcing member 6 and the vertical wires 2A. The plate member 13 is not limited to a steel plate, and other members may be used. The joining members 14 and 15 are not limited to the illustrated U-bolts and nuts, and other members may be used. The joining members 14 and 15 are not limited to two independent configurations. A single joining member may join the plate member 13 and the reinforcing member 6, and the plate member 13 and the main wires 2.

[0037] FIG. 17 is an explanatory diagram showing a modified example of a support member in a rockfall prevention structure according to an embodiment. The support member 16 of the rockfall prevention structure 100 shown in FIG. 17 is made of a wire rope. For example, the support member 16 uses a wire material having the same configuration as the reinforcing member 6 and the main wire material 2. That is, the support member 16 is a wire rope having a wire diameter of 14 mm and a breaking strength of 98 kN. By using the same wire material as the reinforcing member 6 and the main wire material 2, the same wire material can be used at the construction site, and the construction work and cost can be reduced. Note that the support member 16 is not limited to using the same wire material as the reinforcing member 6 and the main wire material 2, and a wire material having an optimal wire diameter and breaking strength is used depending on the construction situation.

[0038] One end of the support member 16 is connected to the horizontal wire 2B of the main wire 2 via a joint member, and the other end is connected to the reinforcing member 6 via a joint member. One example of the joint member is a wire grip. In the embodiment shown in FIG. 17, the reinforcing member 6 and the vertical wire 2A may also be connected by the support member 16. Furthermore, the support member 16 is not limited to the one shown in the figure, and may be provided in multiple locations along the periphery of the reinforcing member 6.

[0039] 15 to 17. The support members 12 and 16 may have other configurations as long as they can connect the reinforcing member 6 and the main wire 2 and can increase the strength of the reinforcing member 6.

[0040] Fig. 18 is an explanatory diagram showing a modified example of a reinforcing member of a rockfall prevention structure according to an embodiment. As shown in Fig. 18, the reinforcing member 6 may be installed in a lattice shape so as to surround the periphery of the opening 10 of the mesh material 1. The reinforcing member 6 is connected to the mesh material 1 via a connecting member 11 made of a coupling coil. In addition, the end of the lattice in the reinforcing member 6 is connected to the main wire material 2 via, for example, a three-sided clip. In this way, the reinforcing member 6 is not limited to the annular shape shown in Fig. 3, and may be installed in any form as long as it can be installed so as to surround the periphery of the opening 10 of the mesh material 1.

[0041] As described above, the rockfall prevention structure 100 according to this embodiment has the opening 10 to avoid obstacles 102 such as trees on the slope 101, and is equipped with the net material 1 that covers the slope 101, and the reinforcing member 6 that surrounds the periphery of the opening 10 and reinforces the net material 1. In other words, the rockfall prevention structure 100 can increase the strength of the net material 1 around the opening 10, so that it can safely hold falling rocks. This makes it possible to prevent the net material 1 from bending or breaking due to the load of the captured falling rocks, and a safe and highly reliable structure can be realized.

[0042] Moreover, the rockfall prevention structure 100 according to this embodiment further includes main wires 2 connected to the mesh material 1, and fixing members 3 for fixing the mesh material 1 and the main wires 2 to the inclined surface 101. In other words, the rockfall prevention structure 100 can increase its strength against the load of falling rocks by the main wires 2 and the fixing members 3, and can therefore safely hold falling rocks.

[0043] Moreover, the main wires 2 are arranged so as to divide the mesh material 1 into a plurality of regions. The reinforcing members 6 are arranged in one or more regions divided by the main wires 2. Thus, in the rockfall prevention structure 100, the opening 10 of the mesh material 1 is surrounded by the main wires 2 together with the reinforcing members 6, so that the strength of the mesh material 1 around the opening 10 can be further increased.

[0044] Moreover, the rockfall prevention structure 100 according to this embodiment further includes a support member 12 or 16 that connects the reinforcing member 6 and the main wire 2. The support member 12 has a plate member 13 arranged between the reinforcing member 6 and the main wire 2, and joining members 14 and 15 that join the plate member 13 to the reinforcing member 6, and the plate member 13 to the main wire 2. Alternatively, the support member 16 is a wire rope. Thus, since the rockfall prevention structure 100 supports the reinforcing member 6 with the support member 12 or 16, the strength of the reinforcing member 6 can be increased and falling rocks can be held more safely.

[0045] Moreover, the reinforcing member 6 is made of a wire material and is formed into a ring shape so as to surround the periphery of the opening 10 of the mesh material 1, with both ends 60 connected by connecting members (7, 8, 9). In other words, the rockfall prevention structure 100 has excellent workability because the reinforcing member 6 can be installed by the simple task of simply deforming the wire material so as to surround the periphery of the opening 10 and connecting both ends 60 by connecting members (7, 8, 9).

[0046] Moreover, both end portions 60 of the reinforcing member 6 are ring-shaped, and both end portions 60 are connected by connecting members (7, 8) hooked onto the ring-shaped both end portions 60. Therefore, in the rockfall prevention structure 100, since the reinforcing member 6 has both ring-shaped end portions 60, it can be firmly connected by the connecting members (7, 8, 9), thereby increasing the strength of the reinforcing member 6.

[0047] In addition, the connecting members 8 are configured to be adjustable in circumferential length. Therefore, the rockfall prevention structure 100 has excellent workability because the size of the reinforcing members 6 can be appropriately adjusted according to the size of the openings 10 of the net material 1.

[0048] Moreover, the reinforcing member 6 is connected to the mesh material 1 via a connecting member 11. The connecting member 11 is made of a spiral coupling coil, and is configured to be entangled with the reinforcing member 6 and the mesh material 1 in common, connecting the reinforcing member 6 to the mesh material 1. Therefore, the rockfall prevention structure 100 can reliably increase the strength of the mesh material 1 around the opening 10 without the reinforcing member 6 coming off the mesh material 1 or shifting out of position.

[0049] Although the rockfall prevention structure 100 has been described above based on the embodiment, the rockfall prevention structure 100 is not limited to the configuration of the above-mentioned embodiment. For example, the rockfall prevention structure 100 is not limited to the components described above, and may include other components. In short, the rockfall prevention structure 100 includes the range of design modifications and application variations that are normally made by a person skilled in the art, within the scope that does not deviate from the technical concept thereof. [Explanation of symbols]

[0050] 1 mesh material, 2 main wire material, 2A vertical wire material, 2B horizontal wire material, 3 fixing member, 4 connecting coil, 5 joint member (cross anchor clip), 5a, 5b through hole, 5c through hole, 6 reinforcing member, 7, 8, 9 connection member, 10 opening, 11 connecting member (connecting coil), 12 support member, 13 plate member, 14 joint member, 14a U-bolt, 14b nut, 15 joint member, 15a U-bolt, 15b nut, 16 support member (wire rope), 20 winding grip, 20a ring portion, 50, 51 clip member, 52 bolt, 60 end portion, 61 aluminum tube, 80 length adjustment member, 80a steel plate, 80b through hole, 80c fastening member, 81 connecting member, 81a support portion, 81b hooking portion, 100 Rockfall prevention structures, 101 slopes, 102 obstacles (trees).

Claims

1. A rockfall prevention structure installed on a slope, comprising: A mesh material covering the inclined surface, the mesh material having an opening for avoiding obstacles on the inclined surface; A reinforcing member that surrounds the opening and reinforces the mesh material; A main wire connected to the net material; a fixing member for fixing the net material and the main wire material to the inclined surface; A support member that connects the reinforcing member and the main wire, The support member is a plate member disposed between the reinforcing member and the main wire; A rockfall prevention structure comprising the plate member, the reinforcing member, and a joining member that joins the plate member and the main wire.

2. A rockfall prevention structure installed on a slope, comprising: A mesh material covering the inclined surface, the mesh material having an opening for avoiding obstacles on the inclined surface; A reinforcing member that surrounds the opening and reinforces the mesh material; A main wire connected to the net material; a fixing member for fixing the net material and the main wire material to the inclined surface; A support member that connects the reinforcing member and the main wire, A rockfall prevention structure, wherein the support member is a wire rope.

3. A rockfall prevention structure installed on a slope, comprising: A mesh material covering the inclined surface, the mesh material having an opening for avoiding obstacles on the inclined surface; A reinforcing member that surrounds the opening and reinforces the net material, The rockfall prevention structure is formed of a wire, is shaped like a ring so as to surround the opening of the mesh material, and has both ends connected by connecting members.

4. 4. A rockfall prevention structure according to claim 3, wherein both ends of the reinforcing member are ring-shaped, and the both ends are connected by connecting members hooked onto both ends of the ring shape.

5. The rockfall prevention structure according to claim 3 or 4, wherein the connecting member is configured so that its circumferential length is adjustable.

6. A main wire connected to the net material; A rockfall prevention structure as described in any one of claims 3 to 5, further comprising a fixing member for fixing the mesh material and the main wire material to the inclined surface.

7. The main wires are arranged to divide the net material into a plurality of regions, The rockfall prevention structure according to claim 1 , 2 or 6 , wherein the reinforcing members are arranged in one or more areas partitioned by the main wire.

8. The rockfall prevention structure according to claim 6 or claim 7 depending on claim 6, further comprising a support member connecting the reinforcing member and the main wire.

9. The support member is a plate member disposed between the reinforcing member and the main wire; 9. A rockfall prevention structure according to claim 8, comprising: the plate member, the reinforcing member, and a joining member that joins the plate member and the main wire.

10. The rockfall prevention structure according to claim 8, wherein the support member is a wire rope.

11. A rockfall prevention structure according to any one of claims 1 to 10, wherein the reinforcing member is connected to the mesh material via a connecting member.

12. The rockfall prevention structure according to claim 11, wherein the connecting member is a spiral coupling coil that is wound around both the reinforcing member and the mesh material to connect the reinforcing member to the mesh material.

Images