JP7624865B2 - Rockfall prevention structure - Google Patents

Description

The present invention relates to a rockfall prevention structure that is installed on slopes where there is a risk of rockfall.

In general, rockfall prevention structures are installed on slopes of mountains and other areas where there is a risk of rockfall, to prevent disasters caused by falling rocks. For example, Patent Document 1 discloses a rockfall prevention net that includes a net material to be installed on the slope of the 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.

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 the ground and make it unstable. For this reason, when installing rockfall prevention netting on slopes with obstacles such as large trees that could affect the ground, it is common to form openings in the netting material to avoid the obstacles.

JP 2018-71211 A

However, forming an opening in the net material reduces the strength of the net material around the opening. Therefore, in conventional rockfall prevention structures, such as the rockfall prevention net disclosed in Patent Document 1, the weight of the captured rocks may cause the net material to bend and break.

The present invention aims to solve the above problems, and aims to provide a safe and reliable rockfall prevention structure that can increase the strength of the net material around the openings formed in the net material to avoid obstacles such as trees on a slope, thereby preventing the net material from bending and breaking under the weight of captured falling rocks.

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 has a plate member arranged between the reinforcing member and the main wire material, and a joining member joining the plate member to the reinforcing member, and the plate member to the main wire material .
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.

The rockfall prevention structure of the present invention is equipped with 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 falling rocks to be safely held. This prevents the net material from bending or breaking due to the load of captured falling rocks, realizing a safe and highly reliable structure.

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. 1 is a front view showing a rockfall prevention structure according to an embodiment of the present invention; 2 is an enlarged view showing a main part of the rockfall prevention structure according to the embodiment of the present invention. FIG. 13 is an explanatory diagram showing a modified example of the mesh material of the rockfall prevention structure of the embodiment. FIG. 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 a rockfall prevention structure according to an embodiment of the present invention. 1 is an enlarged view of a portion of a rockfall prevention structure according to an embodiment of the present invention where a joint member is provided. FIG. FIG. 7 is a view taken along line Y in FIG. 6 . FIG. 2 is an enlarged view of part A shown in FIG. 9 is an enlarged view of part B shown in FIG. 8 as viewed from above. FIG. 2 is an enlarged view of part C shown in FIG. 13 is an explanatory diagram showing a modified example of the fixing member of the rockfall prevention structure according to the embodiment. FIG. 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. 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. 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. 1 is an explanatory diagram showing a configuration of a rockfall prevention structure according to an embodiment, which includes a support member connecting a reinforcing member and a main wire. FIG. 16 is a cross-sectional view of the support member shown in FIG. 15 as viewed from the side. 11 is an explanatory diagram showing a modified example of a support member of the rockfall prevention structure according to the embodiment. FIG. 13 is an explanatory diagram showing a modified example of a reinforcing member of the rockfall prevention structure according to the embodiment. FIG.

The following describes an embodiment of the present invention with reference to the drawings. In each drawing, the same or corresponding parts are given the same reference numerals, and their description will be omitted or simplified as appropriate. In addition, the shape, size, arrangement, etc. of the configurations shown in each drawing may be modified as appropriate within the scope of the present invention.

Embodiment
Fig. 1 is an explanatory diagram showing a state in which a rockfall prevention structure according to an embodiment is installed on a slope of a mountain or the like. Fig. 2 is a front view showing a schematic view of the 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.

As shown in Figure 1, the 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 rockfall. As shown in Figures 1 to 3, the rockfall prevention structure 100 has a mesh material 1 that covers the slope 101, a main wire material 2 connected to the mesh material 1, and a fixing member 3 that fixes the mesh material 1 and the main wire material 2 to the slope 101.

As shown in FIG. 3, the net material 1 is a high-strength wire net formed by weaving a plurality of wires into a diamond shape. The high-strength wire net has, for example, a wire diameter of about 3.2 mm and a tensile strength of 850 N/mm2 ^or more. Incidentally, the net material of a commonly used rockfall prevention structure has, for example, a wire diameter of about 3.2 mm and a tensile strength of about 290 N/ ^mm2 . In the rockfall prevention structure 100 of this embodiment, the net material 1 is a high-strength wire net, and the strength against the load of a falling rock is increased. In addition, by increasing the strength of the net material 1 by using a high-strength wire net, 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 cost can be reduced. Note that the net material 1 is not limited to a configuration using wires having the above-mentioned wire diameter and tensile strength, and is configured using wires that are optimal as appropriate depending on the construction situation. In addition, the net material 1 is not limited to a wire net, and may be, for example, a configuration formed by weaving a rope 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.

In addition, as shown in Fig. 4, the angle θ of the diamond shaped mesh material 1 facing the inclination direction X of the inclined surface 101 may be about 60 degrees. By setting the angle θ to about 60 degrees, the number of intersections of the wires per m2 can be increased, and the load of the falling rocks can be transmitted to the main wires ² while being more dispersed, compared to a mesh material having an angle θ of about 85 degrees facing the inclination direction X of the inclined surface 101. In addition, the wire density increases, and the strength of the mesh material 1 can be increased. In other words, by using the mesh material 1, which is a high-strength wire mesh and has an angle θ of about 60 degrees of the diamond shaped mesh material facing the inclination direction X of the inclined surface 101, the amount of deformation due to the load of the falling rocks can be suppressed, and disasters caused by falling rocks can be reliably prevented.

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 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 to divide the net material 1 into a square grid. As an example, the main wires 2 have 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 constructed using wires that are optimal as appropriate depending on the construction situation. Incidentally, the main wires of commonly used rockfall prevention structures have a wire diameter of about 12 mm and a breaking strength of about 68.6 kN, as an example.

As shown in FIG. 3, the main wires 2 divide the net material 1 so that the vertical and horizontal dimensions _S1 x _S2 of one square are about 2.5 m x 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 x 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.

Figure 5 (A) is a front view showing a coupling coil of a rockfall prevention structure according to an embodiment. Figure 5 (B) is a side view showing a coupling coil of a rockfall prevention structure according to an embodiment. As shown in Figures 2, 3, and 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 it while rotating so that it is entangled with the main wire 2 and the mesh material 1. The dimensions and number of coupling coils 4 are not limited to the configuration shown in the figure. The coupling coil 4 may be, for example, the length of one side or two or more sides of the square.

Figure 6 is an enlarged view of a portion of a rockfall prevention structure according to an embodiment where a joint member is provided. Figure 7 is a view taken along the arrow Y in Figure 6. As shown in Figures 2, 3, and 6, at each location where the vertical wires 2A and horizontal wires 2B that make up the main wire 2 intersect, a joint member 5 that joins the main wire 2 and the fixing member 3 is provided.

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 have two through holes 5a and 5b formed therein. The shaft 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 has 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.

Figure 8 is an enlarged view of part A shown in Figure 1. Figure 9 is an enlarged view of part B shown in Figure 8 from above. Figure 10 is an enlarged view of part C shown in Figure 1. Figure 11 is an explanatory diagram showing a modified example of the fixing member of the rockfall prevention structure according to the embodiment. As shown in Figures 8 to 10, winding grips 20 are attached to both ends of the vertical wire 2A constituting the main wire 2. The winding grip 20 is a fastener in which zinc or aluminum alloy plated steel wires formed into a spiral shape are bundled in parallel and integrated. The winding grip 20 has a ring portion 20a, which 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 grip 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 grip 20. The vertical wire 2A and horizontal wire 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.

The joint members 5 may be provided at all points where the main wires 2 intersect, or may be provided only at necessary points 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.

The fixing member 3 fixes the mesh material 1 and the main wire 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 mesh material 1 and the main wire 2 to the inclined surface 101 via the connecting member 5. The fixing member 3 may be, for example, a pin anchor with a U-shaped hook on the top, as shown in Fig. 11, 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.

However, on the slope 101 of a mountain or the like, there are trees and the like that can be 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 can affect the ground, it is common to form openings 10 in the net material 1 to avoid the obstacles 102, as shown in Figure 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 weight of the captured falling rocks.

Therefore, in the rockfall prevention structure 100 according to the present embodiment, a reinforcing member 6 is provided that surrounds the periphery of the opening 10 of the net material 1 and reinforces the net material 1. The opening 10 of the net material 1 is formed in one or more areas (squares) partitioned by the main wire 2. The opening 10 is formed in a size that takes into account the allowable life of the rockfall prevention structure 100 and the growth of the tree 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 tree 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 tree 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 multiple trees 102 together. In short, the size and shape of the opening 10 should be appropriately modified depending on the size, shape, and type of the tree 102.

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

The reinforcing member 6 uses wire of the same configuration as the main wire 2, for example. In other words, the reinforcing member 6 is composed of a wire rope with a wire diameter of 14 mm and a breaking strength of 98 kN, for example. By using the same wire as the main wire 2 for the reinforcing member 6, the same wire can be used at the construction site, reducing the effort and cost of construction. Note that the reinforcing member 6 is not limited to using the same wire as the main wire 2, and wire with the optimal wire diameter and breaking strength can be used depending on the construction situation.

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 entangle the reinforcing member 6 and the mesh material 1 together to connect the reinforcing member 6 to 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 entangled with the mesh material 1. As an example, eight coupling coils 11 are provided at intervals around the circumference of the reinforcing member 6. Note that the coupling member 11 is not limited to the coupling coil shown in the figure, and may be composed of other members, such as wire.

Figures 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 Figure 12 will be described. Figure 12 (A) shows the reinforcing member 6 stretched out into a straight line. Figure 12 (B) shows the reinforcing member 6 with both ends connected by a connecting member 7 to form a ring. Figure 12 (C) shows an enlarged cross section of part I in (B) seen from the side. The reinforcing member 6 shown in Figure 12 is configured to be a ring so as to surround the periphery of the opening 10 of the net material 1. The reinforcing member 6 has both ends 60 in a ring shape, 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 placed in a rope and compressed to form a ring shape. The connecting member 7 is, for example, a shackle, as shown in Figure 12 (C). Note that the connecting member is not limited to a shackle, and other members may be used.

Next, the reinforcing member 6 shown in Figure 13 will be described. Figure 13 (A) shows the state in which both ends of the reinforcing member 6 are connected by a connecting member 8 to form a ring. Figure 13 (B) shows an enlarged side view of part II shown in (A). The reinforcing member 6 shown in Figure 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.

13 is configured to be adjustable in circumferential length. Specifically, the connection member 8 has a length adjustment member 80 configured to be adjustable in circumferential length, and a coupling member 81 attached to the length adjustment member 80 and hooking the end 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 joining them with the fastening member 80c passed through the through holes 80b. In the illustrated example, the fastening member 80c is composed of a bolt and a nut. In other words, the length adjustment member 80 is configured to be adjustable in circumferential length by changing the positions of the through holes 80b joined by the fastening member 80c. The steel plate 80a is not limited to the arc shape shown in the figure, and may be rectangular, for example. 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 elongated holes extending in the arc direction, for example.

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 they protrude 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 through the shaft portion of the bolt.

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 a connecting member 9 to form a ring. FIG. 14(B) shows an enlarged cross section of the III portion 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 a 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 require both ends 60 to be 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 a 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.

The reinforcing member 6 is not limited to wire material such as the wire rope shown in Figures 12 to 14, but may be, for example, a ring-shaped metal fitting. In other words, the reinforcing member 6 may be of any size, shape, or material as long as it can surround the periphery of the opening 10 of the net material 1 and reinforce the net material 1.

Figure 15 is an explanatory diagram showing a configuration of a rockfall prevention structure according to an embodiment, which includes a support member that connects the reinforcing member and the main wire. Figure 16 is a cross-sectional view of the support member shown in Figure 15 from the side. The rockfall prevention structure 100 shown in Figures 15 and 16 is characterized by the provision of a support member 12 that connects 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.

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 and 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.

In the illustrated embodiment, the reinforcing member 6 and the horizontal wire 2B are connected by the support member 12, but the reinforcing member 6 and the vertical wire 2A may be connected by the support member 12. The number of support members 12 is not limited to the one shown in the figure, and may be provided at multiple locations along the periphery of the reinforcing member 6. In this case, it is preferable to combine the support member 12 connecting the reinforcing member 6 and the horizontal wire 2B with the support member 12 connecting the reinforcing member 6 and the vertical wire 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 U-bolt and nut shown in the figure, 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 wire 2.

Figure 17 is an explanatory diagram showing a modified example of the support member of a rockfall prevention structure according to an embodiment. The support member 16 of the rockfall prevention structure 100 shown in Figure 17 is composed of a wire rope. As an example, the support member 16 uses wire material of the same configuration as the reinforcing member 6 and the main wire material 2. In other words, it is a wire rope with a wire diameter of 14 mm and a breaking strength of 98 kN, for example. 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, reducing the effort and cost of construction. 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 wire material with the optimal wire diameter and breaking strength will be used depending on the construction situation.

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 around the periphery of the reinforcing member 6.

Note that the support members 12 and 16 are not limited to the configurations shown in Figures 15 to 17. The support members 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.

Figure 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 Figure 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, for example, via a three-sided clip. In this way, the reinforcing member 6 is not limited to the annular shape shown in Figure 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.

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

The rockfall prevention structure 100 according to this embodiment further includes a main wire 2 connected to the mesh material 1, and a fixing member 3 for fixing the mesh material 1 and the main wire 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 wire 2 and the fixing member 3, and can therefore safely hold falling rocks.

The main wires 2 are arranged 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. Therefore, the rockfall prevention structure 100 surrounds the opening 10 of the mesh material 1 with the main wires 2 together with the reinforcing members 6, and therefore the strength of the mesh material 1 around the opening 10 can be further increased.

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 includes a plate member 13 that is disposed 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. Therefore, 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.

The reinforcing member 6 is made of wire and is ring-shaped to surround 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 is easy to install because the reinforcing member 6 can be installed simply by deforming the wire to surround the opening 10 and connecting both ends 60 by connecting members (7, 8, 9).

The reinforcing member 6 has both ends 60 that are ring-shaped, and the ends 60 are connected by connecting members (7, 8) that are hooked onto the ring-shaped ends 60. Therefore, the rockfall prevention structure 100 has both ends 60 that are ring-shaped, and can be firmly connected by the connecting members (7, 8, 9), which increases the strength of the reinforcing member 6.

The connecting member 8 is also configured so that its circumferential length can be adjusted. Therefore, the rockfall prevention structure 100 has excellent workability because the size of the reinforcing member 6 can be adjusted appropriately according to the size 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. 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.

The rockfall prevention structure 100 has been described above based on the embodiment, but 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 would normally be made by a person skilled in the art, as long as they do not deviate from the technical concept.

1 mesh material, 2 main wire material, 2A vertical wire material, 2B horizontal wire material, 3 fixing member, 4 connecting coil, 5 joining 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 joining member, 14a U-bolt, 14b nut, 15 joining 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 structure, 101 slope, 102 obstacle (trees).

Claims (12)

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 . 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 . 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. 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. The rockfall prevention structure according to claim 3 or 4 , wherein the connecting member is configured so that its circumferential length is adjustable. 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. 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 regions defined by the main wire. 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. 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. The rockfall prevention structure according to claim 8 , wherein the support member is a wire rope. The 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. 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.

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