TW201435181A - Falling rock protection fence - Google Patents

Abstract

The present invention relates to a falling rock protection fence (1) for absorbing the impact force of falling or rolling rocks (9) or the like from the back side, and preventing the rocks (9) or the like from falling, rolling, or the like to the front side. The fence is provided with a plurality of pillars (2) erected at predetermined intervals in a left-right direction (X), and netting bodies (3) provided between the plurality of pillars (2) and on the back side of the plurality of pillars (2), the netting bodies (3) being designed so that due to the impact force of falling rocks (9) and the like, the left ends of the netting bodies (3) and the right ends of the netting bodies (3) are snared on a plurality of snaring members provided to each of the plurality of pillars (2), so that the meshes formed in the netting bodies (3) can deform.

Description

Rockfall shield

The present invention relates to a rockfall protection grille that absorbs an impact force from a back side caused by falling, rolling, or the like, and prevents falling stones or the like from falling to the front side.

It has been known from the past that it is a rockfall barrier which is installed on a boundary line between a mountain body side where a falling rock or the like falls, a roll, etc., and a valley side where a road or a house is installed. Patent Document 1 discloses a rockfall shield for the purpose of preventing falling rocks and the like from falling to the valley side, rolling off, and the like.

The rockfall barrier disclosed in Patent Document 1 is provided with a plurality of strings of two kinds of ropes having different elastic coefficients between a plurality of pillars which are erected at a predetermined interval in the left-right direction. The rockfall barrier absorbs the impact force from the back side caused by falling or rolling from the mountain side by falling stones or the like by the above-mentioned cable.

In the rockfall protection grille disclosed in Patent Document 1, a plurality of struts that are erected on the foundation and a cable that is erected in a plurality of sections are covered by a metal mesh from the back side. Further, the metal mesh is fixed to the cable by a spacer which is spaced apart from the ground.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-47154

However, the falling rock guard disclosed in Patent Document 1 utilizes any of a plurality of cables. One absorbs the impact force P such as rockfall. That is, as shown in FIG. 20, when the falling rock or the like collides with any of a plurality of cables in which the plurality of sheets are formed, the impact force P of the falling rock or the like is concentrated on a part of the cable. Therefore, there is a problem that a part of the cable is partially broken, and there is a concern that the rock falls or the like falls from the portion where the partial breakage falls to the valley side, and falls off.

Further, in the case where the falling stone shield is hit by any one of a plurality of cables in which the rock is formed in a plurality of sections, the impact force P acting on the falling rock of a part of the cable passes through the The cable is concentrated and transmitted to one of the pillars. Further, there is a problem that a part of the pillar is partially bent by the impact force P that is collectively transmitted to one of the pillars, so that the pillar that is partially bent cannot withstand the impact force P such as rockfall, and the rock falls and the like fall to the valley side. Rolling down and other concerns.

Further, the rockfall protective barrier cable disclosed in Patent Document 1 is stretched tightly between a plurality of pillars without excessive length, and is mainly absorbed by rockfall or the like by elastic deformation of the axial direction of the cable. Impact force caused by falling, rolling, etc. Therefore, the above-described falling stone shield does not sufficiently absorb the impact force P, and there is a problem that it is broken by falling stones, falling rocks, etc., falling to the valley side, rolling off, and the like.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a partial breakage of a mesh body even when an impact force caused by falling or rolling of a falling stone or the like is applied. A rockfall shield with a partially curved and stable and highly reliable pillar.

The rock-falling barrier of the first aspect of the present invention is characterized in that it absorbs an impact force from the back side due to falling or falling of a rock or the like, and prevents falling stones and the like from falling to the front side, rolling off, etc., and includes a plurality of pillars. And erected at a predetermined interval in the left-right direction; and a mesh body disposed on the back side of the plurality of pillars between the plurality of pillars; the mesh system can be borrowed from the mesh formed on the mesh body The left end portion of the net body and the right end portion of the net body are hooked on the upper side of the net body by deformation by impact force such as falling rock A plurality of hook members of each of a plurality of pillars.

According to a first aspect of the present invention, in the rock-falling barrier according to the first aspect of the invention, the hook member is provided in the plurality of pillars on a back side of each of the plurality of pillars. The upper, lower and middle parts of each of the pillars.

According to a second aspect of the present invention, in the rock fall shield of the third aspect of the invention, the rod member has a cross-sectional shape without a corner portion.

According to a second aspect of the present invention, in the net body, the mesh body has a substantially rhombic shape, a substantially hexagonal shape, or a substantially annular shape, and the left end portion and the left end portion are The mesh at the right end portion is hooked to each of the plurality of lever members.

A rock fall shield according to a fifth aspect of the present invention, characterized in that the rock fall shield further includes either or both of an upper cable body and a lower cable body. The upper cable body is coupled to the upper end portion of the mesh body and has an excess length spanned on an upper portion of each of the plurality of pillars, the lower cable body being coupled to the lower end portion of the mesh body and having an excess length erected thereon The lower part of each of the multiple pillars.

According to a sixth aspect of the present invention, in the aspect of the present invention, the present invention further includes a plate material, wherein the plate material is placed in a state in which the mesh body is placed on each of the plurality of rod members, It is disposed on the back side of the above-mentioned pillars than the above-mentioned net body.

A rock fall shield according to a seventh aspect of the present invention, characterized in that the wire strength of the left end portion and the right end portion of the net body is higher than that of the wire portion at the center portion.

According to a first aspect of the present invention, in the first aspect of the invention, the left end portion of the net body and the right end portion of the net body are formed by knitting a plurality of wires.

A rock fall shield according to a ninth aspect of the invention is characterized in that, in any one of the first to eighth inventions, the plurality of net systems are stacked and used.

According to the first to ninth inventions, the mesh is deformed in the vertical direction and deformed in the left-right direction without hindering the deformation of the mesh. Therefore, the wire of the net body itself is elongated in the axial direction, and the impact force of the falling rock or the like can be efficiently absorbed by the elongation of the core of the mesh body. According to the first invention to the ninth aspect of the invention, the net body is placed on the rod member of the pillar, and is fastened without being welded or fastened. Therefore, the net body can be efficiently set by simple work.

Further, according to the first to ninth inventions, the impact force of the falling rock or the like can be transmitted to the entire mesh body by the deformation of the mesh of the mesh body and the elongation of the core direction of the wire of the mesh body. Further, when the net body is used to intercept falling stones, falling rocks, etc., the impact force such as falling stones can be uniformly transmitted to the entire net body to be small. Therefore, it is possible to prevent partial breakage of the mesh body and to exert stable impact absorption performance.

Further, according to the first to ninth inventions, the impact force of the falling rock or the like is uniformly transmitted to the entire net body, whereby the impact force from the left end portion and the right end portion of the net body to the hook member of the strut can be made from the upper portion of the strut. Disperse to the lower part. Therefore, even when the falling rock or the like is caught at any position of the net body, the impact force can be transmitted as a distributed load to the hook member of the pillar. Therefore, stable impact absorption performance can be exerted.

In particular, according to the third aspect of the invention, since the rod member having the cross-sectional shape without the corner portion is used, it is possible to avoid the concentration of the stress caused by the corner portion of the rod member to the mesh portion of the net body, thereby avoiding the local portion of the net body. fracture.

In particular, according to the fifth aspect of the invention, after the upper end portion of the net body is moved downward by a specific distance, the upper cable body is restricted from moving downward, and the height of the net body can be avoided by deformation of the plurality of meshes in the upper and lower directions. Become too low. Therefore, it is possible to prevent the falling stones and the like from falling over the mesh body, falling, rolling, and the like. Further, according to the fifth aspect of the invention, after the lower end portion of the net body is moved upward by a specific distance, the lower cable body is restricted from moving upward, and the net body can be prevented by deformation of the plurality of meshes in the up-down direction. The gap below becomes too large. because Therefore, it is possible to prevent falling stones and the like from falling and rolling off under the mesh body.

In particular, according to the sixth aspect of the invention, it is possible to restrict the left end portion and the right end portion of the net body from moving more than a set distance in the front-rear direction of the strut member, thereby preventing the net body from being detached from the strut member, thereby exerting a stable impact force absorption. performance. Further, according to the sixth aspect of the invention, the impact force of the rod member transmitted from the left end portion and the right end portion of the net body to the strut can be dispersed from the upper portion of the strut to the lower portion via the one sheet material. Therefore, it is possible to exert stable impact absorption performance.

In particular, according to the seventh invention and the eighth aspect of the invention, it is possible to provide an economical net body by reinforcing only the left end portion and the right end portion of the net body which is more easily broken than the central portion of the net body.

In particular, according to the ninth invention, the impact absorption performance can be further improved by a plurality of net bodies. Further, by overlapping a plurality of unconstrained mesh bodies, the plurality of net bodies are naturally shifted in the left-right direction and the vertical direction to make the mesh thinner. Therefore, smaller stones can be trapped.

1‧‧‧falling stone barrier

1a‧‧‧Back side

1b‧‧‧ front side

2‧‧‧ pillar

2a‧‧‧Back side wall

2b‧‧‧ front side wall

2c‧‧‧ upper

2d‧‧‧ lower

2e‧‧‧Intermediate

3‧‧‧ net body

3a‧‧‧Left end

3b‧‧‧Right end

3c‧‧‧Upper

3d‧‧‧lower end

3e‧‧‧Central Department

5‧‧‧ plates

7‧‧ ‧ dividing line

7a‧‧‧ Mountain side

7b‧‧‧ Valley side

9‧‧‧falling stone

20‧‧‧ hooking components

21‧‧‧ rod members

22‧‧‧through holes

31‧‧‧Wire

31a‧‧‧Part 1

31b‧‧‧Part 2

32‧‧‧ mesh

32a‧‧‧Left corner

32b‧‧‧Right corner

32c‧‧‧Upper corner

32d‧‧‧ lower corner

41‧‧‧Upper cable

41a‧‧‧ Both ends (upper cable)

42‧‧‧lower cord

42a‧‧‧ Both ends (lower cable)

P‧‧‧ impact

X‧‧‧ direction

Y‧‧‧Up and down direction

Z‧‧‧ direction

Fig. 1 is a perspective view showing a state in which a plurality of rockfall barriers according to the first embodiment are disposed on a boundary line separating a mountain side and a valley side.

Fig. 2 is a side view showing the first embodiment of the rockfall shield of the present invention.

Fig. 3 is a plan view showing a first embodiment of the rockfall shield of the present invention.

Fig. 4(a) is a plan view showing a pillar of the rockfall guard grill according to the first embodiment, and Fig. 4(b) is a rear view showing a pillar of the rockfall guard grill according to the first embodiment.

Fig. 5 (a) is a perspective view showing a pillar of the rockfall shield of the first embodiment, (b) is a perspective view showing a variation of the pillar of the rockfall shield of the first embodiment, and (c) is a first embodiment. A perspective view of another variation of the struts of the falling rock guard.

Fig. 6 is a rear elevational view showing the net body of the rockfall guard in the first embodiment.

Fig. 7 is a rear elevational view showing a modification of the net body of the rockfall guard grill according to the first embodiment.

Fig. 8 is a view showing another modification of the net body of the rockfall guard grill according to the first embodiment; view.

Fig. 9 is an enlarged rear elevational view showing the mesh of the net body of the rockfall guard in the first embodiment.

Fig. 10 is a rear elevational view showing the rockfall shield of the first embodiment.

Fig. 11 (a) is an enlarged rear elevational view showing a state in which the mesh of the net body is placed on the rod member of the pillar of the rockfall guard in the first embodiment, and (b) is shown in the first embodiment. An enlarged rear view of the state in which the mesh of the mesh body on the rod member of the pillar of the falling rock guard is moved in the left-right direction.

Fig. 12 (a) is an enlarged rear elevational view showing a variation of a state in which the mesh of the net body is placed on the rod member of the pillar of the rockfall guard of the first embodiment, and (b) shows the first position. An enlarged rear view of the state of mesh deformation of the mesh body on the rod member of the pillar of the rockfall guard of the embodiment.

Fig. 13 is a perspective view showing a state in which the net body of the rockfall guard grille of the first embodiment is trapped in falling rocks or the like.

Fig. 14 is a plan view showing a state in which a plurality of net bodies are overlapped in the falling rock guard in the first embodiment.

Fig. 15 is a view showing a state in which the mesh body catches falling rocks or the like in the rockfall shield of the first embodiment.

Fig. 16 is a rear elevational view showing a second embodiment of the rockfall shield of the present invention.

Fig. 17 is a view showing a state in which the mesh body catches falling rocks and the like in the rockfall shield of the second embodiment.

Fig. 18 is a plan view showing a third embodiment of the rockfall shield of the present invention.

Fig. 19 is a perspective view showing a third embodiment of the rockfall shield of the present invention.

Fig. 20 is a front view showing a state in which the prior rockfall barrier has arrested a rockfall or the like.

Hereinafter, the embodiment of the rockfall protection fence of the present invention will be described with reference to the drawings. Explain in detail.

(First embodiment)

As shown in Fig. 1, the rockfall shield 1 of the first embodiment is arranged on the boundary 7 of the mountain side 7a where the falling rock 9 or the like is dropped or rolled, and the valley side 7b where the road or the house is installed. Multiple.

As shown in FIG. 2, the falling rock protection fence 1 includes: a plurality of pillars 2 which are erected on a foundation or a ground, and the like; and a mesh body 3 which is disposed on the side of the mountain body 7a which is dropped, rolled, etc. The back side 1a is opposite to the plurality of pillars 2. The falling stone shield 1 is used to prevent falling stones 9 and the like from being dropped, rolled, and the like by the net body 3, so that the falling stones 9 and the like are arranged to fall and roll off the front side 1b of the valley side 7b with respect to the plurality of pillars 2 By. Here, the back side 1a indicates the upstream side (for example, the mountain side 7a) on the rolling path of the falling rock 9 or the like, and the front side 1b indicates the downstream side (for example, the valley side 7b) on the rolling path of the falling rock 9 or the like.

As shown in FIG. 3, a plurality of pillars 2 are spaced apart from each other in the left-right direction X by a predetermined interval, and are erected by embedding the base end portion of the pillar 2 to a foundation, a ground, or the like. The plurality of pillars 2 are erected, for example, in a state where the adjacent two pillars 2 are spaced apart by a distance of about 3 m in the left-right direction X, and the height of the upper and lower directions Y is about 2 m. Further, the plurality of pillars 2 are assumed to have an interval in which the adjacent two pillars 2 are spaced apart by about 20 m in the left-right direction X, and the height in the vertical direction Y is about 10 m. Here, the left-right direction X indicates the direction in which the plurality of pillars 2 are arranged (the direction in which the straight lines connecting the plurality of pillars 2 are extended), and the vertical direction Y indicates the longitudinal direction of each of the pillars 2.

As each of the pillars 2, as shown in Fig. 4 (a), a square steel pipe having a substantially rectangular cross section is used. Each of the pillars 2 includes a rear side wall 2a facing the back side 1a and a front side wall 2b facing the front side 1b. Each of the pillars 2 is not limited thereto, and a circular steel pipe having a substantially circular cross section may be used, and the material is not limited to the steel material. Each of the pillars 2 is not limited to a hollow shape, and a solid shape may be used, and an H-shaped steel or the like may be used.

Each of the pillars 2 is shown in Fig. 4(b), and is in the left-right direction from the back side wall 2a of the pillar 2. A plurality of hook members 20 are provided in such a manner that a substantially central portion of the X protrudes toward the back side 1a. Here, as the hook member 20, for example, the rod member 21 is used. The hook member 20 is not limited to the lever member 21, and a hook member or the like may be used. Each of the pillars 2 is attached to the back side wall 2a of the pillar 2, and the rod member 21 is provided in each of the upper portion 2c and the lower portion 2d of the pillar 2, and a specific number of the rod members 21 are provided in the intermediate portion 2e. Here, the upper portion 2c of the pillar 2 indicates a specific region of the pillar 2 including the upper end of the pillar 2, and the lower portion 2d of the pillar 2 indicates a specific region of the pillar 2 including the lower end of the pillar 2. Further, the intermediate portion 2e of the pillar 2 indicates a region between the upper portion 2c of the pillar 2 and the lower portion 2d of the pillar 2.

As shown in FIG. 5(a), the rod member 21 is provided on the back side wall 2a of the pillar 2 by fixing the base end portion of the circular steel having a substantially circular cross section of a specific length by welding or the like. Further, as shown in FIG. 5(b), the rod member 21 may be provided on the back side wall 2a of the pillar 2 by fixing the base end portion of the steel material having a substantially elliptical cross section by welding or the like. The rod member 21 is not limited thereto, and may be a bolt or a rebar, or may be fixed in any form, and the material is not limited to the steel material. Further, as the rod member 21, any one of the cross-sectional shapes may be used as the rod member 21, or a substantially elliptical cross-section or a corner portion of a substantially rectangular cross-section may be curved and chamfered. It can be regarded as a substantially polygonal shape profile of the same degree as the cornerless person.

Further, the lever member 21 may be formed in the through hole 22 formed in the front side wall 2a and the front side wall 2b of the pillar 2 in the front-rear direction Z as shown in Fig. 5(c). A rod member 21 is provided for erection. At this time, the rod member 21 may be fixed to the front side wall 2b of the pillar 2 by cutting a thread at the end of the rod member 21 and locking it with the nut from both sides.

As shown in FIG. 6, the mesh body 3 is formed by combining a plurality of metal wires 31 to form a plurality of substantially rhombic meshes 32. Further, in the net body 3, a plurality of meshes 32 having a substantially hexagonal shape may be formed by combining a plurality of steel wires 31 as shown in FIG. Further, as shown in FIG. 8, the net body 3 may be formed by combining a plurality of steel wires 31 into a ring shape. A mesh 32 of generally annular shape. The mesh body 3 is not limited thereto, and a resin material such as a polyethylene resin or the like may be used.

As shown in FIG. 6, the mesh 32 is formed by alternately bending the wire 31 extending in the vertical direction Y in the left-right direction X, and hooking the bent portion of the wire 31 without welding. Thus, a plurality of wires 31 are connected in the left-right direction X. The mesh 32 is not limited thereto, and may be formed by alternately bending the wires 31 extending in the left-right direction X in the vertical direction Y, and connecting the plurality of wires 31 in the vertical direction Y.

As shown in FIG. 9, each of the meshes 32 is formed by connecting a plurality of wires 31 that are alternately bent to form a left corner portion 32a that protrudes to the left, a right corner portion 32b that protrudes to the right, and protrudes upward. The upper corner portion 32c and the lower corner portion 32d protrude downward.

As shown in FIG. 10, the net body 3 is attached to the left end portion 3a and the right end portion 3b of the net body 3 so that a plurality of meshes 32 arranged in the vertical direction Y are hooked on the rod member 21 of the back side wall 2a of the strut 2. The method is arranged between two adjacent pillars 2. The mesh body 3 is not limited thereto, and may be applied to the left end portion 3a and the right end portion 3b of the mesh body 3 such that a plurality of meshes 32 arranged in the vertical direction Y are hooked to the back side wall of the pillar 2 one at a time. The rod member 21 of 2a is arranged in a manner.

As shown in Fig. 11(a), the mesh body 3 is placed on the rear side wall of the plurality of meshes 32 at the left end portion 3a and the right end portion 3b of the net body 3, and the upper portion 32c of the plurality of meshes 32 arranged in the vertical direction Y. On the rod member 21 of 2a. Therefore, the net body 3 does not need to be fixed by welding, fastening, or the like, but is hooked to the strut 2 in a state of being freely moved. Therefore, the net body 3 can be efficiently placed on the pillar 2 by a simple operation. As shown in Fig. 11(b), the net body 3 is stretched as a whole by the impact force P of the falling stone 9 or the like acting on the net body 3. Further, at the left end portion 3a of the net body 3, the left corner portion 32a of the mesh 32 is hooked on the rod member 21 of the back side wall 2a of the strut 2, at the right end portion 3b of the net body 3, and the right corner portion 32b of the mesh 32 is hooked. The rod member 21 is hung on the back side wall 2a of the pillar 2.

At this time, the mesh body 3 acts on the net body 3 by the impact force P of the falling rock 9 or the like, and the left end portion 3a of the net body 3 is moved only from the upper corner portion 32c of the mesh 32 in the left-right direction X and the up-and-down direction Y. a specific distance from the left corner portion 32a, and the right end portion 3b of the net body 3 is in the left and right direction X and The downward direction Y moves only a certain distance from the upper corner portion 32c to the right corner portion 32b of the mesh 32.

Further, as shown in FIG. 12(a), the net body 3 may be hooked to the left corner portion 32a and the right corner portion 32b of the plurality of meshes 32 arranged in the vertical direction Y at the left end portion 3a and the right end portion 3b of the net body 3. The rod member 21 is hung on the back side wall 2a of the pillar 2. At this time, as shown in FIG. 12(b), the net body 3 acts on the net body 3 due to the impact force P such as the falling rock 9 and is stretched as a whole. Further, in the left end portion 3a and the right end portion 3b of the net body 3, the left corner portion 32a and the right corner portion 32b of each mesh 32 are pulled apart in the left-right direction X, and the upper corner portion 32c and the lower corner portion of each mesh 32 are provided. 32d is deformed in such a manner that the vertical direction Y is close.

The rock fall shield 1 is a rod member 21 having a substantially circular cross section or a substantially elliptical cross section and the like. Therefore, in the rockfall shield 1, the stress caused by the corner portion of the rod member 21 can be prevented from being concentrated toward a portion of the mesh 32 of the net body 3, so that partial breakage of the net body 3 can be avoided.

Further, as shown in Fig. 11, for example, in the rockfall guard grill 1, the strength of the wire 31 of the net body 3 of the first portion 31a of the wire member 31 of the rod member 21 of the rod member 21 of the rear side wall 2a of the strut 2 can be made high. The second portion 31b of the wire member 31 of the rod member 21 that is not hooked to the back side wall 2a of the stay 2 is attached. As a result, the strength of the wire 31 of the left end portion 3a and the right end portion 3b of the net body 3 can be made higher than the strength of the wire 31 of the central portion 3e (see FIG. 14) of the net body 3. Further, by making the wire 31 of the left end portion 3a and the right end portion 3b of the net body 3 thicker than the wire member 31 of the central portion 3e of the net body 3, the wire 31 of the left end portion 3a and the right end portion 3b of the net body 3 can be made. The strength of the wire 31 is higher than the central portion 3e of the net body 3. Further, a plurality of wires 31 can be collectively incorporated in the left end portion 3a and the right end portion 3b of the net body 3. Thereby, only the left end portion 3a and the right end portion 3b of the net body 3 which is more easily broken than the central portion 3e of the net body 3 are reinforced, whereby the economical net body 3 can be provided.

In the rockfall protection grille 1, as shown in FIG. 13, when the falling body, falling rock, falling rock 9 or the like is intercepted by the net body 3, the impact force P of the falling rock 9 or the like acts on the entire net body 3, and the net body 3 The whole is deformed in the left-right direction X, the vertical direction Y, and the front-rear direction Z.

In the falling rock protection fence 1, as shown in FIG. 14, the deformation of the mesh 32 is not hindered. Next, the substantially rhombic-shaped mesh 32 is flattened in the up-and-down direction Y and elongated in the left-right direction X, and the impact force P of the falling stone 9 or the like can be efficiently absorbed by the deformation of the mesh 32 of the mesh body 3.

In the rockfall protection grille 1, when the falling body, the falling rock falling stone 9 or the like is intercepted by the net body 3, the substantially rhombic shape mesh 32 is deformed, whereby the wire 31 of the net body 3 itself is in the axial direction of the wire 31. elongation. Thereby, the impact force P of the falling rock 9 or the like can be efficiently absorbed by the elongation of the wire 31 of the mesh body 3 in the axial direction.

In the falling stone shield 1 , since the net body 3 is in a state of being disposed in a margin, the rock can be deformed by the deformation of the mesh 32 of the net body 3 and the axial direction of the wire 31 of the net body 3, thereby causing the falling rock. The impact force P of 9 is transmitted to the entire mesh body 3. In this way, when the falling body, the falling rock 9 or the like is caught by the net body 3, the impact force P of the falling rock 9 or the like can be uniformly transmitted to the entire net body 3 to be small. Therefore, partial breakage of the net body 3 can be prevented, and stable impact absorption performance can be exhibited without using a cord-like body such as a cable.

Further, in the falling stone shield 1 , the impact force P of the falling rock 9 or the like is uniformly transmitted to the entire net body 3, whereby the left end portion 3a and the right end portion 3b of the net body 3 can be transmitted to the rod member 21 of the strut 2 The impact force P is dispersed from the upper portion 2c of the strut 2 to the lower portion 2d. Therefore, even when the falling rock 9 or the like is caught at any position of the net body 3, the impact force P can be transmitted as a distributed load to the rod member 21 of the strut 2, and stable impact absorption performance can be exhibited.

In the rockfall guard grill 1, as shown in FIG. 15, a plurality of net bodies 3 may be overlapped in the front-rear direction Z. In this case, the impact absorption performance can be further improved by the plurality of net bodies 3. Further, a plurality of unconstrained mesh bodies 3 are stacked, whereby the plurality of net bodies 3 are naturally shifted in the left-right direction X and the up-and-down direction Y to make the mesh 32 thinner, thereby trapping smaller stones.

(Second embodiment)

Next, a second embodiment in which the rockfall shield of the present invention is applied will be described. Furthermore, the same constituent elements as the above-described constituent elements are attached by the same symbols. The description is omitted below.

In the second embodiment, as shown in FIG. 16, the falling rock shield 1 further includes an upper cable body 41 which is mounted on each of the upper portions 2c of the plurality of pillars 2, and a lower cable body 42 which is erected on The lower part of each of the plurality of pillars 2 is 2d. The rockfall shield 1 of the second embodiment is not limited thereto, and may include only one of the upper cable body 41 and the lower cable body 42, or may be disposed between the plurality of pillars 2 The intermediate cable body (not shown) of the portion 2e.

The upper cable body 41 is hooked to the rod member 21 located at the upper portion 2c of the adjacent two pillars 2 by hooking the both end portions 41a formed as the upper ring-shaped cable bodies 41, and has the remaining length to be erected on the left and right sides. Direction X. The upper cable body 41 is incorporated into a plurality of meshes 32 connected to the upper end portion 3c of the mesh body 3 so as not to interfere with the deformation of the entire mesh body 3. The upper cable body 41 is not limited thereto, and may be connected to a plurality of meshes 32 of the upper end portion 3c of the mesh body 3 by using a connecting coil, a hook or the like in a plurality of portions in the left-right direction X.

The lower cable body 42 is hooked to the rod member 21 located at the lower portion 2d of the adjacent two pillars 2 by hooking the both end portions 42a formed as the annular lower portion cords 42 to the left and right sides. Direction X. The lower cable body 42 is incorporated into a plurality of meshes 32 connected to the lower end portion 3d of the mesh body 3 so as not to interfere with the deformation of the entire mesh body 3. The lower cable body 42 is not limited thereto, and may be connected to a plurality of meshes 32 of the lower end portion 3d of the net body 3 by using a connecting coil, a hook or the like in a plurality of portions in the left-right direction X.

As the upper cable body 41 and the lower cable body 42, a steel cable or the like having a larger diameter than the wire 31 of the mesh body 3 is used. The upper end portion 3c and the lower end portion 3d of the net body 3 can be reinforced by the upper cable body 41 and the lower cable body 42 so that the bundled portions of the upper end portion 3c and the lower end portion 3d of the net body 3 are not separated. . The upper cable body 41 and the lower cable body 42 are not limited thereto, and any material or shape may be used.

The upper cable body 41 and the lower cable body 42 have an excess length in the left-right direction X. Therefore, the upper cable body 41 and the lower cable body 42 act on the mesh body by the impact force P of the falling rock 9 or the like. 3, the upper end portion 3c and the lower end portion 3d of the net body 3 are stretched by a connecting coil or the like, and are moved by a specific distance in the vertical direction Y.

In the rock fall shield 1 of the second embodiment, as shown in FIG. 17, the mesh 32 having a substantially rhombic shape is flattened in the vertical direction Y and elongated in the left-right direction X without hindering the deformation of the mesh 32. Therefore, the impact force P of the falling rock 9 or the like can be efficiently absorbed by the deformation of the mesh 32 of the net body 3.

In the falling stone shield 1 of the second embodiment, when the falling body 9 is dropped by the net body 3, the substantially rhombic shape mesh 32 is deformed, and the wire 31 of the net body 3 itself is deformed. It is elongated in the axial direction of the wire 31. Thereby, the impact force P of the falling rock 9 or the like can be efficiently absorbed by the elongation of the wire 31 of the net body 3 in the axial direction.

Here, in the rock fall shield 1 of the second embodiment, after the upper end portion 3c of the net body 3 is moved only downward by a certain distance in the up-down direction Y, the upper cable-like body 41 restricts the downward direction Y. Move. Thereby, the deformation of the plurality of meshes 32 in the up-down direction Y can be avoided to prevent the height of the net body 3 from becoming too low, thereby preventing the falling stones 9 and the like from falling over the net body 3, falling, rolling, and the like.

Further, in the rock fall shield 1 of the second embodiment, after the lower end portion 3d of the net body 3 is moved by a certain distance above the upper and lower direction Y, the lower cable body 42 is restricted above the upper and lower directions Y. mobile. Thereby, the gap between the lower and lower directions Y of the plurality of meshes 32 can be prevented, and the gap below the net body 3 can be prevented from becoming excessively large, thereby preventing the falling stones 9 and the like from falling and rolling off under the net body 3.

In the rock fall shield 1 of the second embodiment, since the mesh body 3 is provided with a margin, the deformation of the mesh 32 of the mesh body 3 and the elongation of the wire 31 in the axial direction can be performed. The impact force P of the falling rock 9 or the like is transmitted to the entire net body 3. In this way, when the falling body, the falling rock 9 or the like is caught by the net body 3, the impact force P of the falling rock 9 or the like can be uniformly transmitted to the entire net body 3 to be small. Thereby, it is possible to prevent the net body 3 from being partially broken to exert stable impact absorption performance.

Further, in the falling stone shield 1 of the second embodiment, the impact force P of the falling rock 9 or the like is uniformly transmitted to the entire mesh body 3, whereby the left end portion 3a and the right end portion 3b of the net body 3 can be transmitted to the pillar 2 The impact force P of the rod member 21 is dispersed from the upper portion 2c of the strut 2 to the lower portion 2d. Therefore, even when the falling rock 9 or the like is caught at any position of the net body 3, the impact force P can be transmitted as a distributed load to the rod member 21 of the strut 2, so that the net body 3 can exert a stable impact force. Absorption performance.

(Third embodiment)

Next, a third embodiment to which the rockfall shield of the present invention is applied will be described. The same components as those described above are denoted by the same reference numerals and will not be described below.

As shown in FIG. 18, the rockfall shield 1 of the third embodiment further includes a plate material 5 which is provided on the back side wall 2a of the pillar 2 on the back side 1a of the pillar 2 from the mesh body 3.

As shown in Fig. 19, the plate member 5 has through holes penetrating in the front-rear direction Z at the upper portion, the lower portion, and the intermediate portion of each of the plate members 5. The plate 5 is placed on the upper member 2c, the lower portion 2d, and the intermediate portion of the column 2 by being placed on the rod member 21 of the column 2 by being hooked by the mesh 32 located at the left end portion 3a and the right end portion 3b of the net body 3. The rod member 21 of 2e is inserted into the through hole and attached. Further, the plate member 5 may be any one in which the net body 3 is not detached from the rod member 21. If the plate member 5 is larger than the mesh member 32, a plurality of the rod members 21 may be attached to each other. Plate 5.

The plate 5 is fixed by a nut lock or the like in a state where the mesh 32 of the net body 3 is deformable so as to be separated from the back side wall 2a of the strut 2 by a predetermined distance in the front-rear direction Z. At this time, in order to lock the sheet 5 in a state in which only a certain distance is separated, a spacer may be used.

In the rockfall shield 1 of the third embodiment, the substantially rhombic shape mesh 32 is flattened in the vertical direction Y and elongated in the left-right direction X without hindering the deformation of the mesh 32, by the mesh 32 The impact force P of the falling rock 9 or the like can be efficiently absorbed by the deformation. In addition, when the net body 3 is used to catch a falling stone, a rock falling from the falling stone 9, etc., a substantially rhombic shape mesh The deformation of 32 is such that the wire 31 of the net body 3 itself is elongated in the axial direction of the wire 31. Thereby, the impact force P of the falling rock 9 or the like can be efficiently absorbed by the elongation of the wire 31 of the net body 3 in the axial direction.

Here, in the rock fall shield 1 of the third embodiment, after the left end portion 3a and the right end portion 3b of the net body 3 are moved by a certain distance in the front-rear direction Z, the movement of the front-rear direction Z is restricted by the sheet material 5. Thereby, the left end portion 3a and the right end portion 3b of the net body 3 are restricted from moving by a predetermined distance in the front-rear direction Z on the rod member 21 of the strut 2, whereby the net body 3 can be prevented from being detached from the rod member 21 of the strut 2. Therefore, stable impact absorption performance can be exerted.

In the rock fall shield 1 of the third embodiment, since the net body 3 is provided with a margin, the deformation of the mesh 32 of the net body 3 and the elongation of the wire 31 in the axial direction can be made. The impact force P of the falling stone 9 or the like is transmitted to the entire net body 3. In this way, when the falling body, the falling rock 9 or the like is caught by the net body 3, the impact force P of the falling rock 9 or the like can be uniformly transmitted to the entire net body 3 to be small. Therefore, it is possible to prevent the net body 3 from being partially broken to exert stable impact absorption performance.

Further, in the falling stone shield 1 of the third embodiment, the impact force P of the falling rock 9 or the like is uniformly transmitted to the entire net body 3, whereby the left end portion 3a and the right end portion 3b of the net body 3 can be transmitted to the strut 2 The impact force P of the rod member 21 is dispersed from the upper portion 2c of the strut 2 to the lower portion 2d. Thereby, even when the falling rock 9 or the like is caught at any position of the net body 3, the impact force P can be transmitted as a distributed load to the rod member 21 of the strut 2, so that the net body 3 can exert a stable impact. Force absorption performance.

Further, in the rockfall shield 1 of the third embodiment, the impact force P transmitted from the left end portion 3a and the right end portion 3b of the net body 3 to the rod member 21 of the strut 2 can be made from the strut 2 via the one sheet 5 The upper portion 2c is further dispersed to the lower portion 2d. Therefore, a more stable impact absorption performance can be exerted.

The embodiments of the present invention have been described in detail above. However, the above embodiments are merely examples for embodying the embodiments of the present invention, and the technical scope of the present invention is not It should be interpreted in a limited manner by means of such content.

[Industrial availability]

The present invention does not cause partial breakage of the mesh body and local bending of the pillar even when the impact force caused by falling or rolling of the falling rock or the like is applied, and can be used as a rockfall with high stability and reliability. The fence is used.

1‧‧‧falling stone barrier

2‧‧‧ pillar

3‧‧‧ net body

7‧‧ ‧ dividing line

7a‧‧‧ Mountain side

7b‧‧‧ Valley side

9‧‧‧falling stone

X‧‧‧ direction

Y‧‧‧Up and down direction

Z‧‧‧ direction

Claims (9)

A rockfall protection grille is characterized in that it absorbs an impact force from a back side such as falling or rolling of a falling rock, and prevents falling stones from falling to the front side, rolling off, etc., and includes a plurality of pillars. And the mesh body is erected at a predetermined interval; and the mesh body is disposed on the back side of the plurality of pillars between the plurality of pillars; and the mesh system is formed on the mesh of the mesh body The left end portion of the net body and the right end portion of the net body are hooked to a plurality of hook members provided on each of the plurality of pillars by deformation by impact force such as falling rock. The rockfall barrier of claim 1, wherein the hook member tie member is disposed on an upper portion of each of the plurality of pillars so as to protrude and extend from a side wall of a back side of each of the plurality of pillars , lower part and middle part. The rockfall shield of claim 2, wherein the rod member has a cross-sectional shape without a corner. The rockfall barrier of claim 2 or 3, wherein the mesh body has a mesh having a substantially rhombic shape, a substantially hexagonal shape or a substantially annular shape, and the mesh of the left end portion and the right end portion is hooked Each of the plurality of rod members described above. The rockfall shield of any one of claims 1 to 4, further comprising either or both of an upper cable body and a lower cable body, the upper cable body being coupled to the upper end portion of the mesh body and having The remaining length is erected on the upper portion of each of the plurality of pillars, and the lower cable body is coupled to the lower end portion of the net body and has an excess length spanned below each of the plurality of pillars. A rockfall shield according to any one of claims 1 to 5, which further comprises a sheet material, the sheet The material is placed on the back side of the pillar in a state in which the net body is placed on each of the plurality of rod members. The rockfall barrier of any one of claims 1 to 6, wherein the strength of the wire of the left end portion and the right end portion of the mesh body is higher than the strength of the wire of the central portion. The rockfall barrier of any one of claims 1 to 6, wherein the left end portion of the mesh body and the right end portion of the mesh body are formed by braiding a plurality of wires. The rockfall barrier of any one of claims 1 to 8, wherein a plurality of the above-described mesh systems are overlapped for use.