Guard fences and reinforcement structures for guard fences

Abstract

To provide a technology excellent in absorption of impact energy due to falling rocks in a protective fence.SOLUTION: A protective fence comprises a plurality of support columns 10 provided on foundations G via an anchor 21, a net 30 stretched across wire ropes 31 and 33 bridged over each side of upper end parts and lower end parts of the plurality of support columns 10, a first brace material 25 that couples an upper end part of one terminal support column 13 of two support columns adjacent to each other out of the plurality of support columns 10 and a lower end part of the other terminal support column 14, a second brace material 27 that couples the lower end part of one terminal support column 13 and the upper end part of the other terminal support column 14, a hanging rope (support member) 29 which has one end coupled to the upper end part of at least one terminal support column 13 out of one terminal support column 13 and the other terminal support column 14 to which the first brace material 25 and the second brace material 27 are coupled, and has the other end fixed to the foundations G, and an upper chord member 23 that couples the upper end parts of the terminal support columns 13 and 14 that are coupled to each other by the first brace material 25 and the second brace material 27.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to a safety fence and a reinforcing structure for the safety fence. [Background technology]

[0002] Conventionally, there are known protective fences that are installed at the foot of slopes, cliffs, etc. to capture falling rocks, earth and sand, etc. The protective fences include, for example, a plurality of support posts that are erected by being buried in a foundation such as the ground, natural ground, or concrete, and a protective net that is installed across the plurality of support posts (see, for example, Patent Document 1).

[0003] In the protective fence described in Patent Document 1, of the multiple posts, the terminal posts at the ends in the extension direction of the protective fence are reinforced by support posts. The support posts are erected on a concrete foundation, extending diagonally downward from the center of the terminal posts in the extension direction of the protective fence. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-014760 Summary of the Invention [Problem to be solved by the invention]

[0005] In the protective fence of Patent Document 1, the support posts increase rigidity and reinforce the terminal posts. However, the support posts are made of highly rigid steel material such as H-beams, and are fixed to the base of the protective fence in the same way as the multiple posts, which prevents the terminal posts from collapsing or deforming.

[0006] The protective fence is designed to absorb the energy of falling rocks by plastically deforming the posts and net when capturing the rocks, but it is expected that the high rigidity of the support posts will reduce the efficiency of energy absorption due to deformation throughout the entire protective fence.

[0007] Therefore, the present invention has been made in consideration of the above-mentioned problems, and aims to provide a technology that is excellent in absorbing the impact energy of falling rocks in a protective fence. [Means for solving the problem]

[0008] Therefore, the present invention has been made in consideration of the above-mentioned problems, and is characterized by comprising a plurality of pillars attached to a foundation via anchors, a net stretched via wire ropes hung on each side of the upper and lower ends of the plurality of pillars, a first brace material connecting the upper end of one of two adjacent pillars among the plurality of pillars to the lower end of the other pillar, a second brace material connecting the lower end of one of the pillars to the upper end of the other pillar, a support member having one end connected to the upper end of at least one of the one pillar and the other pillar to which the first brace material and the second brace material are connected, and the other end fixed to the foundation, and a chord member connecting the upper ends of the two pillars connected to each other by the first brace material and the second brace material.

[0009] In one embodiment of the protective fence of the present invention, the two posts connected to each other by the first brace material and the second brace material may each be connected to each other at their lower ends by a chord member.

[0010] In one aspect of the present invention, a protective fence may comprise a fixed plate fixed to the foundation and a sliding plate attached so as to be freely slidable relative to the fixed plate, and the other end of the support member may be attached to the sliding plate.

[0011] In one aspect of the protective fence of the present invention, the fixed plate may have a weakened portion on the side of the foundation relative to the attachment position with the sliding plate.

[0012] In one embodiment of the protective fence of the present invention, at least one spacing member may be provided between the wire rope stretched between the plurality of posts on the upper end side of the posts and the wire rope stretched between the lower end side of the posts.

[0013] In one embodiment of the protective fence of the present invention, the first brace material and the second brace material may connect two adjacent posts on at least one end side in the arrangement direction of the multiple posts.

[0014] In one aspect of the protective fence of the present invention, the support member may be provided on at least one of the posts located at both ends in the direction in which the posts are arranged.

[0015] Furthermore, in order to solve the above-mentioned problems, the reinforcing structure for a protective fence of the present invention is a reinforcing structure for a protective fence comprising a plurality of posts attached to a foundation and a net stretched via wire ropes suspended around the upper and lower ends of the plurality of posts, and is characterized in comprising anchors connected to the posts and driven into the ground to secure the posts to the foundation, a first brace material connecting the upper end of one of two adjacent posts among the plurality of posts to the lower end of the other post, a second brace material connecting the lower end of the one post to the upper end of the other post, and a support member having one end connected to the upper end of at least one of the posts to which the first brace material and the second brace material are connected and the other end fixed to the foundation so that the protective fence is supported on the foundation. [Effects of the Invention]

[0016] According to the present invention, impact energy caused by falling rocks can be effectively absorbed by the safety fence. [Brief explanation of the drawings]

[0017] [Figure 1A] 1 is a schematic front view for explaining the configuration of a protective fence according to the present embodiment. FIG. [Figure 1B] 1 is a schematic perspective view showing the installation state of a protective fence according to the present embodiment. [Figure 2A] FIG. 2 is a side view illustrating the configuration of the support posts of the protective fence according to the present embodiment. [Figure 2B] FIG. 2 is a schematic bottom view illustrating the configuration of the support posts of the safety fence according to the present embodiment. [Figure 3] FIG. 2 is an enlarged view of a portion of the protective fence to explain the configuration of the reinforcing structure. [Figure 4A] FIG. [Figure 4B] FIG. [Figure 5] FIG. 2 is a side view of the protective fence according to the present embodiment. [Figure 6A] FIG. 4 is a perspective view illustrating the configuration of a fixing plate of the fixing unit. [Figure 6B] FIG. 10 is a perspective view of a fixed unit for explaining the configuration of a sliding plate. [Figure 7] 10A and 10B are schematic diagrams for explaining the behavior of the fixing unit when impact energy is applied. [Figure 8] 10A and 10B are diagrams showing modified examples of support members for the safety fence relative to the foundation. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in the following description, the drawings are schematic, and the dimensional relationships and ratios of elements may differ from the actual ones. The dimensional relationships and ratios may differ between the drawings.

[0019] <Configuration of the protective fence> The guardrail fence 1 according to this embodiment is a structure for preventing rocks, earth, sand, and the like rolling down a slope from flowing onto roads, houses, and the like. The guardrail fence 1 is installed, for example, on the mountain side of a slope so that it crosses the slope direction. Note that the use of the guardrail fence 1 is not limited to capturing rocks, earth, and the like, and it can also be used, for example, to prevent snow from flowing out due to an avalanche.

[0020] The protective fence 1 according to this embodiment comprises a plurality of posts 10 attached to a foundation G via anchors 21, a net 30 stretched via wire ropes 31, 33 suspended around the upper and lower ends of the plurality of posts 10, a first brace member 25 connecting the upper end of one terminal post 13 to the lower end of the other terminal post 14 of two adjacent posts among the plurality of posts 10, a second brace member 27 connecting the lower end of one terminal post 13 to the upper end of the other terminal post 14, and a suspension rope (support member) 29 connected at one end to the upper end of at least one of the terminal posts 13 and the other terminal post 14 to which the first brace member 25 and the second brace member 27 are connected, and fixed at the other end to the foundation G. The configuration of the protective fence 1 according to this embodiment will be described in detail below.

[0021] FIG. 1A is a schematic front view illustrating the configuration of a protective fence 1 according to this embodiment. FIG. 1B is a schematic perspective view showing the installed state of the protective fence 1 according to this embodiment. The protective fence 1 according to this embodiment comprises multiple posts 10 (13, 14, 15), a reinforcing structure (anchors 21, upper chord members (chord members) 23, brace members (first brace members) 25, brace members (second brace members) 27, and suspension ropes (support members) 29), and a net 30. The posts 10 of the protective fence 1 according to the present invention are not installed with their lower ends substantially buried in the foundation, but rather protrude from the foundation G of the protective fence 1 due to anchors 21 (described below). In other words, the posts 10 cannot maintain their upright position relative to the foundation G by themselves. The foundation G may also be the ground, natural ground, an artificial foundation formed of concrete, or the like.

[0022] (post) The support posts 10 are formed, for example, from steel pipes. The support posts 10 are called or classified as terminal support posts 13, 14 and intermediate support posts 15 depending on their placement in the protective fence 1. The terminal support posts 13, 14 and intermediate support post 15 are called or classified according to their placement position in the protective fence 1, and each has approximately the same structure. In the following description, when there is no need to distinguish between the terminal support posts 13, 14 and the intermediate support post 15, they will simply be referred to as "support posts 10."

[0023] Figure 2A is a side view illustrating the configuration of a support post 10 of a protective fence 1 according to this embodiment. Figure 2B is a schematic bottom view illustrating the configuration of a support post 10 of a protective fence 1 according to this embodiment. The support post 10 has two holes 10a at each of its lower end on the foundation G side and its upper end opposite the foundation G. U-bolts ub (see Figure 5) for holding wire ropes 31, 33, which will be described later, are attached to the holes 10a at the upper and lower ends.

[0024] The support 10 has a flange portion 11 on the foundation G side. The flange portion 11 is formed, for example, in a rectangular shape in a plan view. A base plate 22 (described later) is connected to the flange portion 11, thereby connecting the support 10 to an anchor 21 (described later). The flange portion 11 has connecting holes 11a and insertion holes 11b. The connecting holes 11a are provided in each corner region of the flange portion 11. When the flange portion 11 and the base plate 22 are connected, connecting tools such as bolts used for connecting the flange portion 11 to the base plate 22 are inserted into each connecting hole 11a.

[0025] The insertion hole 11b is formed around an axis that passes through the center of the support 10. The insertion hole 11b is formed to accommodate a part of the anchor 21 and connecting tools such as a bolt and a nut.

[0026] Of the support posts 10, the terminal support posts 13 are support posts located at both ends in the extension direction of the protective fence 1, and of the support posts 10, the terminal support post 14 is a support post located adjacent to the terminal support post 13. The terminal support posts 13 and 14 have upper end mounting portions 13a and 14a and lower end mounting portions 13b and 14b, respectively.

[0027] The upper end mounting portions 13a, 14a are formed, for example, from steel flat plates that are rectangular in plan view. The upper end mounting portions 13a, 14a are provided on the upper end sides of the terminal struts 13, 14, respectively. The upper end mounting portions 13a, 14a are provided on the outer peripheral surfaces of the terminal struts 13, 14. The terminal struts 13, 14 are installed so that their respective upper end mounting portions 13a, 14a face each other. An upper chord member 23 (described later) is attached to the upper end mounting portions 13a, 14a, and one end of the brace members 25, 27 is also attached to the upper end mounting portions 13a, 14a.

[0028] The lower end mounting portions 13b, 14b are formed, for example, from steel flat plates having a rectangular shape in a plan view. The lower end mounting portions 13b, 14b are provided on the lower end sides of the terminal struts 13, 14, respectively. The lower end mounting portions 13b, 14b are provided on the same side of the outer circumferential surface of the terminal struts 13, 14 as the upper end mounting portions 13a, 14a. The terminal struts 13, 14 are installed so that the respective lower end mounting portions 13b, 14b face each other. The other ends of the brace materials 25, 27, which will be described later, are attached to the lower end mounting portions 13b, 14b.

[0029] Of the supports 10, the intermediate supports 15 are supports provided between the terminal supports 14 on both end sides of the protective fence 1. The number of intermediate supports 15 provided can be determined according to the size of the protective fence 1 and is not particularly limited, and they may not be provided at all depending on the size of the protective fence 1. The intermediate supports 15 may or may not have upper end mounting portions 13a, 14a and lower end mounting portions 13b, 14b.

[0030] (reinforced structure) Figure 3 is an enlarged view of a portion of the protective fence 1 to explain the configuration of the reinforcing structure. The reinforcing structure is made up of terminal supports 13, 14, and reinforces the protective fence 1 to prevent it from collapsing when, for example, the protective fence 1 catches a falling rock, without hindering the protective fence 1 from absorbing the impact energy of the falling rock through deformation as much as possible. The reinforcing structure includes anchors 21, upper chord members (chord members) 23, brace members (first brace members) 25, brace members (second brace members) 27, and suspension ropes (support members) 29.

[0031] The anchors 21 are connected to the terminal posts 13, 14 and driven into the ground so that their extending directions are aligned or nearly aligned in a straight line. The anchors 21 are bolts made of deformed reinforcing bars. The anchors 21 are connected to the terminal posts 13, 14 via base plates 22.

[0032] Fig. 4A is a side view of the base plate 22. Fig. 4B is a plan view of the base plate 22. The base plate 22 is made of metal and has an attachment portion 22a and a storage portion 22b that are integrally formed with each other.

[0033] The mounting portion 22a has a rectangular shape in plan view, similar to the flange portions 11 of the terminal supports 13, 14. The mounting portion 22a has connecting holes 221a and insertion holes 222a. The connecting holes 221a are provided in each corner region of the mounting portion 22a. When the mounting portion 22a is connected to the base plate 22 of the terminal supports 13, 14, a bolt used for connecting the terminal supports 13, 14 is inserted into each connecting hole 221a. The insertion holes 222a are formed around an axis passing through the center of the terminal supports 13, 14. The insertion holes 222a are formed so that a part of the anchor 21 can be inserted therethrough.

[0034] The accommodating portion 22b is formed in a tubular, for example, cylindrical, shape and is provided integrally with the mounting portion 22a and concentrically with the insertion hole 222a. The base plate 22 is connected to the flange portions 11 of the terminal posts 13, 14 so that the accommodating portion 22b extends on the side opposite the terminal posts 13, 14.

[0035] The anchor 21, with one end on which a thread is formed, is accommodated in the accommodation portion 22b, and penetrates the base plate 22 toward the terminal posts 13, 14, and is fixed to the base plate 22 by fitting a nut or the like from the side of the terminal posts 13, 14. The anchor 21 is also connected to the intermediate post 15 in the same manner as the terminal posts 13, 14.

[0036] (Top chord) The upper chord member 23 is a long, compression-resistant member made of, for example, metal, and is provided between the terminal struts 13, 14. One end of the upper chord member 23 is attached to the upper end mounting portion 13a of the terminal strut 13 with fasteners such as bolts and nuts. The other end of the upper chord member 23 is attached to the upper end mounting portion 14a of the terminal strut 14 with fasteners such as bolts and nuts.

[0037] (Brace material) Each of the brace members 25 and 27 has two reinforcing bar sections 25a and 27a, and two reinforcing bar sections 25b and 27b, and connecting sections 25c and 27c. The reinforcing bar sections 25a and 27a are formed of, for example, rebar, which has tensile strength. In the protective fence 1 according to this embodiment, the brace members 25 and 27 are arranged to cross each other between the terminal posts 13 and 14.

[0038] One end of the reinforcing bar portion 25a of the brace material 25 is attached to the upper end mounting portion 13a of the terminal support 13 with fasteners such as bolts and nuts, and the other end is connected to one end of the reinforcing bar portion 25b via a connecting portion 25c. The other end of the reinforcing bar portion 25b is attached to the lower end mounting portion 14b of the terminal support 14 with fasteners such as bolts and nuts.

[0039] One end of the reinforcing bar portion 27a of the brace material 27 is attached to the upper end mounting portion 14a of the terminal support 14 with fasteners such as bolts and nuts, and the other end is connected to one end of the reinforcing bar portion 27b via a connecting portion 27c. The other end of the reinforcing bar portion 27b is attached to the lower end mounting portion 13b of the terminal support 13 with fasteners such as bolts and nuts.

[0040] The reinforcing bar portions 25a, 27a, 25b, and 27b of the brace materials 25 and 27 are screwed into the connecting portions 25c and 27c, respectively, and by turning the connecting portions 25c and 27c, the spacing between them in the extension direction (the length of the brace materials 25 and 27) can be fine-tuned.

[0041] (hanging rope) 5 is a side view of the protective fence 1 according to this embodiment. The suspension rope 29 is formed, for example, from a steel wire rope. The suspension rope 29 has a ring-shaped loop formed on one end, and is attached, for example, via a U-bolt ub, to the upper end of the terminal support 13, the upper end of the intermediate support 15, and the upper end of one of a plurality of spacers 35 described below. The other end of the suspension rope 29 is fixed to the foundation G, for example, via a fixing unit 40 described below.

[0042] 6A is a perspective view illustrating the configuration of the fixing plate 41 of the fixing unit 40. FIG. 6B is a perspective view of the fixing unit 40 illustrating the configuration of the sliding plate 46. When the protective fence 1 is viewed from the front, the fixing unit 40 may be provided behind the terminal support 13, or on the side of the terminal support 13 that is away from the terminal support 14. The fixing unit 40 has the fixing plate 41 and the sliding plate 46.

[0043] The fixing plate 41 is, for example, a metal plate material that is L-shaped when viewed from the side. For example, it is fixed to the foundation G via anchors 42. The fixing plate 41 has a fixing portion 43 and a connecting portion 45. The fixing portion 43 and the connecting portion 45 are integrally formed at a predetermined angle to each other, for example, a right angle or a substantially right angle.

[0044] The fixing portion 43 has a fixing hole 43a. The anchor 42 is inserted into the fixing hole 43a and fixed to the fixing portion 43 with a nut or the like, whereby the fixing unit 40 is fixed to the foundation G.

[0045] The connecting portion 45 has a weakened hole (weakened portion) 45a and a connecting hole 45b. The weakened hole 45a is, for example, a portion that contributes to the bending of the connecting portion 45 and serves as a target failure portion. The weakened hole 45a is, for example, formed as a circular hole that penetrates the connecting portion 45 in the thickness direction. The weakened hole 45a is located on the fixing portion 43 side with respect to the connecting hole 45b. Note that the target failure portion in the connecting portion 45 is not limited to a hole, and may be configured as a portion with a reduced thickness, such as a groove.

[0046] The connecting hole 45b is formed, for example, as a circular hole that penetrates the connecting portion 45 in the thickness direction. The connecting hole 45b is located on the opposite side of the weakening hole 45a from the fixed portion 43. The connecting hole 45b is formed as a round hole, and a bolt, for example, is inserted into the connecting hole 45b to attach a nut, which is used for connection to the sliding plate 46 described below.

[0047] The sliding plate 46 is, for example, a metal plate having a rectangular shape in a plan view. The sliding plate 46 has a connecting hole 46a and an attachment hole 46b. The connecting hole 46a is, for example, an elongated hole extending along the longitudinal direction of the sliding plate 46. The sliding plate 46 is placed on the fixed plate 41 so that the connecting hole 46a aligns with the connecting hole 45b of the fixed plate 41, and the sliding plate 46 and the fixed plate 41 are connected to each other by, for example, a fastener BN consisting of a bolt and nut. The attachment hole 46b is formed as a round hole and is used for connecting the other end of the suspension rope 29.

[0048] The fastener BN that connects the fixed plate 41 and the sliding plate 46 is fixed at the position of the connecting hole 45b of the fixed plate 41, so that the sliding plate 46 can move relative to the fixed plate 41 along the connecting hole 46a, which is formed as a long hole.

[0049] (net) The net 30 is stretched across the entire support posts 10 of the protective fence 1. The net 30 is made of, for example, high-strength wire mesh, but is not limited to this and may be made of fiber netting, special wire mesh woven into ring shapes, or the like, as long as it has a predetermined strength.

[0050] The net 30 is stretched across the entire surface between the terminal posts 13 at both ends of the protective fence 1 via wire ropes 31, 33 that are suspended at the upper and lower ends of each. Ring-shaped loops are formed on both ends of the wire ropes 31, 33, and the loops are passed through the terminal posts 13 at both ends of the protective fence 1 and are attached via U-bolts ub (see Figure 5) that attach the hanging ropes 29 to the terminal posts 13.

[0051] A plurality of spacers (spacing members) 35 are provided between the wire ropes 31, 33 (see FIGS. 1A and 1B). The spacers 35 are, for example, long metal members. The spacers 35 are provided along the height direction between the upper wire rope 31 and the lower wire rope 33. The spacers 35 are provided, for example, between the terminal supports 14 at predetermined intervals.

[0052] According to the protective fence 1 described above, the posts 10 of the protective fence 1 are attached to the foundation G via the anchors 21, and therefore there is no need to bury one end of the post 10 in the foundation G, and therefore the length of the post 10 itself can be shortened by the amount of burying it in the foundation G. As a result, when constructing the protective fence 1, the length of the post 10 transported to the construction site is shortened, facilitating transportation work, and there is no need to excavate the foundation G extensively to embed the post 10 when installing it in the foundation G, reducing the burden of construction work. With the protective fence 1, the anchors 21 are driven into the foundation G and fixed therein with mortar, for example, and therefore construction work is significantly easier than when the posts 10 are erected on the foundation G.

[0053] Furthermore, falling rocks are captured by the net 30 made of high-strength wire mesh, but the impact energy of the falling rocks is transmitted to the wire ropes 31, 33 that support the net 30 in the protective fence 1, and is supported by the terminal supports 13, 14. The impact energy can be absorbed by deformation of the net 30, elongation of the wire ropes 31, 33, and plastic deformation of the intermediate supports 15, etc.

[0054] Furthermore, in the protective fence 1, the terminal posts 13 are supported relative to the foundation G by the hanging ropes 29, which prevents the terminal posts 13 from collapsing due to the impact when a falling rock is caught by the net 30, preventing major deformation of the entire protective fence 1. In addition, because the intermediate posts 15 and spacers 35 are supported relative to the foundation G by the hanging ropes 29, the strength of the entire protective fence 1 can be increased.

[0055] Furthermore, since the brace materials 25, 27 are arranged so as to intersect with each other on the terminal supports 13, 14, a reaction force is applied to the lower end of each of the terminal supports 13, 14, and when a falling rock is caught by the protective fence 1, the protective fence 1 resists tipping over at both ends, thereby preventing the protective fence 1 from deforming significantly.

[0056] Furthermore, because the upper ends of the terminal struts 13, 14 are connected to each other by the upper chord 23, a rectangular or approximately rectangular frame, such as a square or rectangle, is formed at both ends of the protective fence 1 in combination with the terminal struts 13, 14, the brace members 25, 27, and the foundation G. For example, if only one brace member 27 were provided, the terminal strut 14 would deform and distort in the front-to-back and left-to-right directions, possibly deforming into a parallelogram or other shape, making it impossible to maintain its correct shape. When the terminal strut 14 is deformed, the extension direction of the terminal strut 14 deviates from the extension direction of the anchor 21. In this deformed state, the performance of the protective fence 1 in capturing falling rocks is reduced. In the protective fence 1 according to the present invention, the rectangular or approximately rectangular shape can be maintained by the terminal struts 13, 14, the upper chord 23, and the foundation G, allowing the protective fence 1 to maintain its high rock-capturing performance.

[0057] Furthermore, the hoisting ropes 29 are fixed to the foundation G via the fixed plate 41 and sliding plate 46 of the fixed unit 40. Figure 7 is a schematic diagram for explaining the behavior of the fixed unit 40 when impact energy is applied. Even if the impact of capturing a falling rock causes the terminal support 13 to tilt in the rolling direction of the falling rock and tension is applied to the hoisting ropes 29, the sliding plate 46 slides relative to the fixed plate 41, thereby reducing the tension applied to the hoisting ropes 29. This makes it possible to prevent the terminal support 13 from collapsing while allowing it to deform, thereby absorbing the impact energy when the falling rock is captured.

[0058] Furthermore, since the fixing plate 41 is formed with weakening holes 45a as weakening portions that promote bending of the fixing plate 41, when a falling rock is captured and the suspending rope 29 is pulled, the fixing plate 41 falls from the weakening holes 45a in the pulling direction of the suspending rope 29. This makes it possible to further effectively weaken the tension applied to the suspending rope 29.

[0059] Furthermore, the protective fence 1 is provided with spacers 35, which prevents the net 30 from slackening near the center along the extension direction of the protective fence 1. This allows the net 30 to maintain an appropriately tensioned state along the extension direction of the protective fence 1.

[0060] <Other> While the present invention has been described above as a preferred embodiment, it is not limited to the above embodiment and encompasses all aspects encompassed by the concept and scope of the claims. Furthermore, various configurations may be selectively combined as appropriate to achieve at least some of the above-described problems and advantages. Furthermore, the shape, material, arrangement, size, etc., of each component in the above embodiment may be modified as appropriate depending on the specific application of the invention. For example, in the protective fence 1 according to this embodiment, the terminal posts 13, intermediate posts 15, and spacer 35 are supported to the foundation G by the hanging ropes 29, but they may be supported by other means. Figure 8 shows a modified example of the support members of the protective fence 1 relative to the foundation G.

[0061] The protective fence 1 may be fixed to the foundation G via two long members 29A, 29B made of steel. One end of one long member 29A is connected to the upper end of the terminal support 13 with a bolt, nut, etc., and the other end is connected to one end of the other long member 29B with a bolt, nut, etc. The other end of the other long member 29B is connected to the fixing unit 40 with a bolt, nut, etc.

[0062] The two elongated members 29A, 29B are connected at the ends that are connected to each other so that they can move relative to each other. For example, the hole formed in the end of elongated member 29B that is connected to elongated member 29A is formed as an elongated hole. As a result, when a falling rock is caught by the net 30, the elongated member 29A moves along the elongated member 29B as the terminal support 13 deforms. This makes it possible to absorb the falling energy of the falling rock and prevent the protective fence 1 from collapsing, while also allowing the support 10 of the protective fence 1 to deform.

[0063] Furthermore, in the above-described embodiment, the reinforcing structures are formed at both ends of the protective fence 1, but depending on the size of the protective fence 1, they may also be provided in the center of the protective fence 1.

[0064] Furthermore, in the above embodiments, the suspension rope 29 was attached to the terminal support 13, the intermediate support 15 and the spacer 35, but it is sufficient that it is attached to at least the terminal support 13, and it can be appropriately selected and attached depending on the size of the protective fence 1.

[0065] Furthermore, in the above-described embodiment, the protective fence 1 is provided with only the upper chord 23. However, the protective fence 1 may also include a lower chord. The lower chord is provided at the lower end of the terminal struts 13, 14 in the height direction relative to the upper chord 23, and connects the terminal struts 13, 14 to each other at their lower ends. For example, if a falling rock strikes the middle of the protective fence 1, the intermediate strut 15 will fall, and a force will act on the innermost of the two terminal struts 13, 14, tending to topple it toward the intermediate strut 15. In this case, the brace material 27 will be pulled, and shear force may be generated in the anchor 21 to which the terminal strut 13 is connected. The shear force generated in the anchor 21 is distributed via the lower chord to the terminal strut 14 located inside the terminal strut 13, and the shear force generated in the two anchors 21 can resist the force tending to topple the terminal strut 14. [Explanation of symbols]

[0066] REFERENCE SIGNS LIST 1...protective fence, 10...support, 13, 14...terminal support, 15...intermediate support, 21...anchor, 23...upper chord (chord), 25...brace (first brace), 27...brace (second brace), 29...suspension rope (support member), 29A, 29B...long member (support member), 30...net, 31, 33...wire rope, 35...spacer (spacing member), 40...fixing unit, 41...fixing plate, 45a...weakening hole (weakened portion), 46...sliding plate

Claims

1. a plurality of supports attached to the foundation via anchors; A net stretched via wire ropes stretched across the upper and lower ends of the plurality of columns; a first brace material connecting an upper end of one of two adjacent columns among the plurality of columns to a lower end of the other column; a second brace material connecting a lower end of the one support column and an upper end of the other support column; a support member having one end connected to an upper end of at least one of the one support column and the other support column to which the first brace material and the second brace material are connected, and the other end fixed to the foundation; a chord member connecting upper ends of two columns connected to each other by the first brace member and the second brace member; a fixed plate fixed to the foundation; a sliding plate slidably attached to the fixed plate and having the other end of the support member attached thereto; Equipped with The fixed plate has a weakened portion on the side of the foundation relative to the attachment position of the sliding plate. A protective fence characterized by:

2. The protective fence according to claim 1, characterized in that the two posts connected to each other by the first brace material and the second brace material are each connected to each other at their lower ends by a chord member.

3. A protective fence as described in claim 1 or 2, characterized in that at least one spacing member is provided between the wire rope stretched between the plurality of posts on the upper end side of the posts and the wire rope stretched between the lower end side of the posts.

4. A protective fence as described in any one of claims 1 to 3, characterized in that the first brace material and the second brace material connect two adjacent posts on at least one end side in the arrangement direction of the multiple posts.

5. 5. The safety fence according to claim 4, wherein the support member is provided on at least one of the posts located at both ends in the direction in which the posts are arranged.

6. A protective fence described in any one of claims 1 to 5, wherein the weakened portion is configured to promote bending of the fixed plate.

7. A reinforcement structure for a protective fence, comprising a plurality of posts provided on a foundation and a net stretched over the upper and lower end sides of the plurality of posts via wire ropes, an anchor connected to the support pole and driven into the ground to secure the support pole to the foundation; The upper end of one of the two adjacent columns among the plurality of columns and the upper end of the other column a first brace material connecting the lower end portion and the first brace material; a second brace material connecting a lower end of the one support column and an upper end of the other support column; a support member having one end connected to an upper end of at least one of the one support column and the other support column to which the first brace material and the second brace material are connected, and the other end fixed to the foundation, so that the protective fence is supported on the foundation; a fixed plate fixed to the foundation; a sliding plate slidably attached to the fixed plate and having the other end of the support member attached thereto; Equipped with A reinforcing structure for a protective fence, wherein the fixed plate has a weakened portion on the side of the foundation relative to the attachment position with the sliding plate.

8. A reinforcing structure as described in Claim 7, wherein the weakened portion is configured to promote bending of the fixing plate.

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