JP6675631B1 - Shock absorbing fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock absorbing fence capable of enhancing the safety performance of the shock absorbing fence by reducing the maximum impact force at the time of a strike. SOLUTION: A shock absorbing fence having a plurality of columns 10, an upper side rope 21 stretched between the upper portions of adjacent columns 10, a shock absorber 30 provided in a part of the upper side rope 21, and a protective net 20. Therefore, a plurality of load transfer ropes 23, which are independent from each other in span units of the columns 10 and are laid across between the upper portions of the adjacent columns 10, and the side frames connected between the upper portions of the terminal columns 10b and the side anchors 40. The rope 24 is provided, and the load transmission rope 23 is laid across the upper portions of the adjacent columns 10 with a slack greater than that of the upper rope 21. [Selection diagram] Fig. 1

Description

  The present invention relates to a shock absorbing fence that captures falling objects such as falling rocks, landslides, and avalanches, and more particularly to a shock absorbing fence that has a simple structure to reduce the maximum impact force.

Shock absorbing fences provided with struts and protective nets are well known, and various proposals have been made according to the magnitude of shock absorbing performance.
An example of a conventional shock absorbing fence will be described with reference to FIG.
Patent Literatures 1 and 2 disclose a plurality of horizontal ropes 51 laid between upper and lower portions of adjacent columns 50, a plurality of shock absorbers 52 provided near both ends of each horizontal rope 51, and a plurality of horizontal ropes 51. A shock absorbing fence comprising a protective net 53 stretched around a rope 51 is disclosed.

  Patent Literature 3 discloses a shock absorbing fence in which each column 50 can be tilted in all directions (360 °) to prevent the column 50 from being damaged due to excessive stress acting on the base at the time of receiving. Is disclosed.

JP-A-6-57712 JP 2000-273828 A JP 2009-185514 A

The problem of the conventional shock absorbing fence will be described with reference to FIG. 6B which is a model diagram of the shock absorbing fence when the falling object W collides.
<1> The conventional shock absorbing fence that absorbs shock energy in units of spans requires a huge load in a short time on the strut 50, the horizontal rope 51, the shock absorber 52, and the protection net 53 located in the receiving span. concentrate.
Therefore, when designing the shock absorbing fence, it is necessary to design the shock absorbing fence in consideration of the maximum impact force of the falling object W.
<2> In order to be able to withstand the assumed maximum impact force, components such as the support 50 and the protective net 53 constituting the shock absorbing fence must be designed with high strength, and the material cost of the shock absorbing fence is low. Bulky.
<3> When the protective net 53 located in the receiving span is deformed toward the valley side, the columns 50, 50 located in the receiving span are dragged, and are unrestricted toward the valley side and the direction approaching each other. Lean down. When the columns 50, 50 are greatly tilted, the fence height of the non-receiving span adjacent to the receiving span decreases, and the capturing performance of the following falling object W in the non-receiving span decreases.

  The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a shock absorbing fence capable of reducing the maximum impact force at the time of receiving and improving the safety performance of the shock absorbing fence. Is to do.

The present invention provides a plurality of struts each composed of an intermediate strut and a terminal strut, an upper rope independently stretched in span units of the struts, and stretched between upper portions of adjacent struts, and provided on a part of the upper rope. A shock absorbing fence having a shock absorbing device that attenuates the tension when a certain amount of tension acts thereon, and a protective net having an upper side supported by the upper rope, wherein the shock absorbing fence is independent in units of spans of the columns, and is disposed between upper portions of adjacent columns. A plurality of load transmission ropes, and a side stay rope connected between the upper portion of the terminal support and the side anchor, and the load transmission ropes are adjacent to each other with a slack larger than the upper side rope. and laterally placed between the upper strut, tilting force of struts located receiving hammer span in受撃time for supporting laterally the anchor via the load transmission rope and the side ahead rope adjacent non受撃span , Non-attack span Constituting As can transmit loads only supporting upper rope tilting strut located 受撃 span through the load transmission time to eliminate slack of the load transmission rope.
In another embodiment of the present invention, a cushioning device may be provided on a part of the side stay rope.
In this case, the operation starting force of the buffer device of the side stay rope is set to be larger than the operation starting force of the buffer device of the upper rope.
In another form of the present invention, the shock absorbing fence is a standby type in which the lower side of the protective net is supported at the lower part of the support, a standby type in which the lower side of the protective net is fixed to the slope side, or the lower side of the protective net is supported. The present invention can be applied to any one of the pocket type disposed on the slope valley side.

The present invention has the following effects.
<1> By previously providing slack in the load transmission ropes suspended between the upper portions of the adjacent columns, the load transmission time through the load transmission ropes can be lengthened.
Therefore, the shock absorbing time in the receiving span becomes longer, the maximum impact force at the time of receiving can be reduced, and the safety performance of the shock absorbing fence can be improved.
<2> By reducing the maximum impact force, it is possible to reduce the load burden on each material constituting the shock absorbing fence, and to significantly reduce the material cost of the shock absorbing fence.
<3> Since the load transmission rope limits the free tilt of the column located in the non-receiving span to a certain range, the height change of the protection net in the non-receiving span can be suppressed to a minimum.
Therefore, it is possible to guarantee that the subsequent fallen object is captured by the protection net located in the non-receiving span.
<4> By setting the relationship between the starting force of the shock absorber of the side retaining rope and the starting force of the shock absorber of the upper side rope to be larger, the shock absorber provided on the upper and lower side ropes at the time of the impact is preceded. While operating, the impact force at the time of receiving can be reliably transmitted and supported to the side anchor.
<5> It can be applied to various types of impact absorbing fences with different installation positions on the lower side of the protective net, and is highly versatile.

Front view of the shock absorbing fence according to the present invention with a part omitted It is explanatory drawing of the attachment structure of an upper and lower side rope and a support | pillar, (A) is a perspective view of the attachment part of an upper and lower side rope and a support | pillar with a part omitted, (B) is an exploded view of a shock absorber. Front view of the shock absorbing fence before receiving, with some parts omitted Front view of the shock absorbing fence at the time of receiving with some parts omitted FIG. 7A is an explanatory view of another embodiment applied to another shock absorbing fence, and FIG. 10A is a model diagram of a shock absorbing fence applied to a standby type shock absorbing fence supported by fixing a lower side of a protection net to a slope mountain side. (B) is a model diagram of a shock-absorbing fence applied to a pocket-type shock-absorbing fence in which the lower side of the protective net is arranged on the slope valley side. Front view of the shock absorbing fence assumed by the present invention

  Hereinafter, the present invention will be described with reference to the drawings.

<1> Outline of Shock Absorbing Fence Referring to FIG. 1, the shock absorbing fence of the present invention includes a plurality of pillars 10 erected at predetermined intervals and a protection stretched between the plurality of pillars 10. The net 20 and the upper and lower side ropes 21 and 22 with the cushioning device 30 stretched between the upper part and the lower part of the adjacent pillars 10 independently of each other in the span unit of the pillar 10, and independent of the span unit of the pillar 10. It comprises a plurality of load transmission ropes 23 laid between the upper portions of the mating columns 10, and side stay ropes 24 connected between the upper portions of the terminal columns 10 b and the side anchors 40.
Hereinafter, each constituent material of the shock absorbing fence according to the present invention will be described in detail.

<2> Support (intermediate support, terminal support)
The strut 10 includes an intermediate strut 10a and a terminal strut 10b, and any one of known steel materials such as a shaped steel or a steel pipe, a concrete pillar, a filled steel pipe combining a steel pipe and a concrete, or the like can be applied.
The support column 10 may be erected such that it can be tilted, or the lower portion of the column 10 may be buried in a concrete foundation, a local ground, or the like so that it cannot be tilted.
In addition to the standing structure (for example, Japanese Patent Application Laid-Open No. 2009-185514) that allows tilting in all directions, the tilting column 10 may have a hinge structure that allows tilting along a slope direction.

Although not shown, when the support 10 is of a tilting type in all directions, the mountain side connected between the head of the support 10 and the mountain-side anchor so as not to hinder the free tilt of the support 10. One stay rope is used for one support 10.
In this case, a known shock absorber may be interposed in a part of the mountain side stay rope.

<3> Protective Net The protective net 20 is a known net material that can be laid horizontally between the upper and lower portions of the adjacent columns 10 over the span unit of the columns 10 or over a plurality of spans.
For the protective net 20, a metal or fiber rope net, a wire net, or a polymer thereof can be applied.
The upper and lower sides of the protection net 20 are attached to the upper and lower side ropes 21 and 22 via connecting coils and the like.

<4> Upper and lower side ropes The upper side rope 21 and the lower side rope 22 are rope materials for supporting the upper and lower sides of the protection net 20, and are stretched between the upper and lower portions of the adjacent columns 10 with little slack.

<4.1> Rope Length Explained with reference to FIGS. 1 and 2, each of the upper and lower side ropes 21 and 22 has a total length longer than the span length of the column 10.
Both ends of each of the upper and lower side ropes 21 and 22 penetrate through the through holes 11 at the upper and lower portions of the column 10, respectively, and the shock absorber 30 disposed in contact with the outer peripheral surface of the column 10 is provided at the end of each of the upper and lower side ropes 21 and 22. It is slidably gripped near.
The ends of the upper and lower ropes 21 and 22 extend outward from the shock absorber 30 as extra lengths.

<4.2> Buffer Device The buffer device 30 is a device for attenuating the tension of the upper and lower ropes 21 and 22 when a certain or more tension acts on the ropes.
A description will be given of the friction sliding type shock absorber 30 illustrated in FIG. 2B. The shock absorber 30 includes a pair of holding plates 31 each having a half groove capable of holding the upper and lower ropes 21 and 22, and a pair of holding plates. 31 includes a U-shaped fastening bolt 32 capable of penetrating therethrough 31 and a nut 33, and when the tension of the upper and lower ropes 21 and 22 clamped between the pair of clamping plates 31 exceeds the gripping force, the upper and lower ropes 21 and 22 slide.
The shock absorbing device 30 is not limited to the friction sliding type, and a known shock absorbing device can be applied as long as the structure can attenuate the tension when a predetermined or more tension acts on the upper and lower ropes 21 and 22.

<5> Load Transmission Rope The load transmission rope 23 is a rope material for transmitting a load between the adjacent columns 10, and has both ends fixed to the upper portions of the adjacent columns 10 so as not to slide.

<5.1> Looseness of load transmission rope While the upper side rope 21 is stretched between the upper portions of the adjacent columns 10, the load transmission rope 23 has a predetermined slack between the upper portions of the adjacent columns 10 and is laterally extended. Put on.
It is difficult to stretch the upper rope 21 without any slack, and the upper rope 21 is slightly slackened.
The slack of the load transmission rope 23 is a slack amount compared to the upper rope 21, and the load transmission rope 23 has a larger slack than the upper rope 21.

<5.2> Reason for giving the load transmission rope slack The load transmission rope 23 was given a predetermined slack because the buffer device 30 located in the receiving span is preferentially operated and the shock absorption is performed. This is to reduce the maximum impact force of the fence.
In other words, the operation time of the shock absorber 30 provided in the receiving span is lengthened by extending the load transmitting time when transmitting the load in a chain to the non-receiving span columns 10 at the time of receiving. is there.
On the other hand, since the inclination of the column 10 located in the receiving span increases in proportion to the amount of slack of the load transmission rope 23, the amount of slack of the load transmission rope 23 is appropriately selected in consideration of the span length of the column 10 and the like. I do.

<6> Side stay rope A side anchor 40 is provided on the side of the terminal support 10b on the extension of the shock absorbing fence, and the side stay rope 24 is connected between the side anchor 40 and the upper part of the terminal support 10b.
By supporting the terminal support 10b with the side stay ropes 24, the load can be transmitted between the plurality of load transmission ropes 23 and the side stay ropes 24, and the impact force applied to the receiving span is finally reduced. The structure can be transmitted to the side anchor 40.

<6.1> Shock absorber for side stay rope A shock absorber 35 is interposed in a part of the side stay rope 24. When the tension exceeds a certain value, the shock absorber 35 operates to hold the side stay rope. The tension of the rope 24 can be attenuated.
The shock absorber 35 may be the friction-sliding shock absorber 30 described above or a plastic deformation shock absorber.
Further, the shock absorber 35 of the side stay rope 24 is not indispensable, and the shock absorber 35 may be omitted when the shock absorbing fence is for a small scale.

<6.2> Relationship between upper and lower ropes and shock absorbers provided on side stay ropes When shock absorbers 35 are provided on side stay ropes 24, shock absorbers 30 and side stay ropes 24 provided on upper and lower ropes 21 and 22 are provided. Are not the same.
The operation start force of the shock absorber 35 provided on the side stay rope 24 is set to be larger than the operation start force of the shock absorber 30 provided on the upper and lower ropes 21 and 22.
For example, if both the shock absorbers 30 and 35 are of a friction sliding type, the gripping force of the side stay rope 24 is made larger than the gripping force of the upper and lower ropes 21 and 22.

<6.3> Reason for providing a difference in the operation start force of the shock absorber The difference in the operation start force of the two shock absorbers 30 and 35 is due to the shock absorber provided on the upper and lower ropes 21 and 22 at the time of receiving. This is for the purpose of operating the 30 in advance and transmitting the impact force at the time of receiving to the side anchor 40.

[Capture of shock absorbing fence]
The trapping action of the shock absorbing fence will be described with reference to FIG. 3 showing the shock absorbing fence before receiving and FIG. 4 showing the shock absorbing fence at the time of receiving.
Upon following description, for easy understanding, a plurality of struts 10 is denoted as post 10 ₁ to 10 ₄ toward the right from the left in the figure, rightward upper rope 21 from the left side of the figure toward indicated as upper rope ₂₁ 1 to 21 ₄ will be described with referred to as load transfer rope ₂₃ 1-23 ₄ toward even load transmission rope 23 from the left side in the figure to the right.

1. Shock absorbing fence before receiving (Fig. 3)
Before受撃, each upper rope ₂₁ 1 to 21 ₄ which is stretched between the top of each strut ₁₀ 1 to 10 _4, to hold the upper interval of each post ₁₀ 1 to 10 ₄ adjacent. Each load transmission rope ₂₃ 1-23 ₄ with slack is not functioning to hold the upper interval of each post ₁₀ 1 to 10 _4.

2. Shock absorption fence at the time of receiving (Fig. 4)
<1> Deflection and deformation of the protection net When a falling object W such as a falling rock collides with a part of the protection net 20 (for example, between the pillars 10 ₃ and 10 ₄ ), the protection net 20 is bent and deformed to the valley side, and the protection net 20 is deformed. Absorbs a part of the impact energy of the falling object W due to the buffering action.

<2> shock absorbing fences transmission present invention tilting force strut, transmits by using the slack of the load transmission rope 23 _2, 23 ₁ non受撃spans an impact load to the cushioning device 30 of受撃span S ₃ Is what you do.
Hereinafter, the impact force transmitting route acting on受撃span S ₃ will be described.

When the protective net 20 is deformed to the valley side, the pair of pillars 10 ₃ , 10 ₄ located in the receiving span S ₃ tilting force in the direction approaching each other and tilting force toward the valley side (both tilting forces are collectively referred to as both tilting forces). Then, it is called “tilting power”.
In this example, to facilitate understanding, the behavior of the left half of the shock absorbing fence exerted by the tilting force toward the approaching direction of the columns 10 ₃ and 10 ₄ will be described, and the behavior of the right half of the shock absorbing fence will be described in the left half. The description is omitted here.

<2.1> Load transmission through the load transmission rope and the side stay rope The tilting force of the columns 10 ₃ and 10 ₄ located in the reception span S ₃ is the non-reception span S ₂ that has been switched from the relaxed state to the tensioned state. , travels through the load transfer ropes 23 _2, 23 ₁ located on S ₁ post 10 ₁ is a terminal post, it is further supported by the final lateral anchor 40 via the side ahead rope 24.

<2.2> Limited Sliding of Upper Rope and Limited Tilt of Strut in Non-Receiving Span When transmitting the tilting force of the struts 10 ₃ and 10 ₄ located in the receiving span S ₃ to the lateral anchor 40, non受撃span _S 2, upper rope ₂₁ 2 non受撃span due to the shock absorber 30 provided on the _{S 1} is activated _S 2, _{S 1,} 21 ₁ part of the tension restrictively slide Absorb.
By buffering device 30 of the non受撃span _S 2, _{S 1} is activated, each strut ₁₀ 2, 10 ₁ non受撃span _S 2, _{S 1} is limited to tilt toward受撃span _{S 3} .

Upper rope ₂₁ 2 located in the non受撃span _S 2, _{S 1,} 21 ₁ of the slide and each strut ₁₀ 2, 10 with the _first tilting, non受撃span _S 2, the load transmission rope 23 of _{S 1 2} , 23 ₁ of the slack is gradually reduced.
When slack in the load transmission rope ₂₃ 2, 23 ₁ is in tension completely disappeared, and the operation of the shock absorber 30 provided on the non受撃span _S 2, _{S 1,} non受撃span _S 2, _{S 1} each strut ₁₀ 2, 10 ₁ of tilting is interrupted.
Each switched to tension load transfer ropes ₂₃ 2, 23 _1, hold each strut ₁₀ 2, 10 ₁ of the head gap is located in the non受撃span _S 2, _{S 1} constant.
Thus during受撃, non受撃span _S 2, the load transmission rope ₂₃ 2 _{S 1,} 23 ₁ is to give the reaction force from the side anchor 40, located in the non受撃span _S 2, _{S 1} limiting the tilting strut ₁₀ 2, 10 ₁ located in the upper side rope ₂₁ 2, 21 ₁ of the sliding and non受撃span _S 2, _{S 1} to a predetermined range.

<2.3> shock absorbing action in受撃span non受撃span _S 2, the load transmission rope ₂₃ located _{S 1} 2, 23 while _{the first} slack is eliminated, the load transmission rope located受撃span _{S 3} 23 ₃ is still loose.
Therefore, the upper and lower side ropes 21 ₃ and 22 located in the receiving span S ₃ are deformed toward the valley side, and the tension is increased.
The tension of the upper and lower sides rope 21 _3, 22 located受撃span S ₃ is the shock absorber 30 provided on受撃span S ₃ exceeds a predetermined value is activated.

Thus during受撃is受撃span located S ₃ upper and lower sides rope 21 _3, 22 in response to an increase in the tension of the受撃span S to only shock absorber 30 provided ₃ is actuated fallen object W Efficiently absorb the impact energy of

3. In operation timing受撃when buffering performance <1> shock absorber of the shock absorbing fence, provided at a plurality of shock absorbers 30 and side refrain ropes 24 provided on受撃span S ₃ and non受撃span S _2, S ₁ The shock absorbers 35 do not operate at the same time.
The operation timing of each of the shock absorbers 30 and 35 at the time of the impact is summarized as follows.

受撃immediately after without actuating the shock absorber 30 provided on受撃span S ₃ is non受撃span S _2, shock absorber 30 provided on the S ₁ is limited to operate.

Thereafter, by non受撃span _S 2, the load transmission rope ₂₃ 2 _{S 1,} 23 ₁ is switched from a state in which a slack in tension, shock absorber 30 of the non受撃span _S 2, _{S 1} is the working stop, shock absorber 30 provided on受撃span S ₃ instead operates.

Shock absorber 35 provided on the side ahead ropes 24, so advance operation start force as compared with the buffer device 30 provided in the upper rope 21 is set large,受撃span S ₃ or non受撃span S _2, shock absorber 35 provided on Gawakata ahead rope 24 prior to operation of the shock absorber 30 provided on the S ₁ is never activated.
The shock absorber 35 provided on the side stay rope 24 operates when the tension of the side stay rope 24 exceeds the operation starting force of the shock absorber 35.

<2> Load transmission time and transmission speed Since the load transmission ropes 23 ₂ and 23 ₁ have slack, the tilting force of the columns 10 ₃ and 10 ₄ of the receiving span S ₃ is reduced by the non-receiving spans S ₂ and S _1. of before being supported by the side anchor 40 via the load transfer ropes 23 _2, 23 ₁ and the side ahead rope 24 takes a constant load transmission time.
Since the load transmission ropes 23 ₂ and 23 _{1 of the} non-receiving spans S ₂ and S ₁ have slack, the speed of transmitting the load through the load transmission ropes 23 ₂ and 23 ₁ decreases.

<3> The operation time受撃span of the shock absorber in this way, and that the upper rope 21 _third predetermined time until the load is transmitted to the (load transmission time) takes a受撃span S _3, transmission speed of the load There by reducing,受撃span S ₃ of the upper side rope 21 ₃ to the buffer device 30 the operating time by provided (impact absorption time) becomes longer.
Therefore, it long deformation time of the upper side rope 21 ₃ and guard net 20 in受撃span _{S 3.}

<4> As described above the maximum impact force,受撃shock absorption time in the span S ₃ (modification time) that is longer, the maximum impact force which is the peak of impact force loads受撃span S ₃ is Become smaller.
Since the maximum impact force can be reduced, the load on each material such as the support pillar 10 and the upper and lower ropes 21 and 22 constituting the shock absorbing fence can be reduced, and the material cost of the shock absorbing fence can be significantly reduced.
Furthermore, since the maximum impact force can be reduced, it is possible to cope with rockfall energy that slightly exceeds the design conditions (assumed), so safety is higher than conventional shock absorbing fences and the disaster mitigation effect is significantly improved. .

4. In fence height change受撃span _{S 3} of <1>受撃span the fence height change of the shock absorbing fence, since posts ₁₀ 3, 10 ₄ tilts inwardly, in accordance with the tilting strut ₁₀ 3, 10 ₄受撃fence height of guard net 20 in the span S ₃ is changed low, but since the free tilting of the strut 10 _3, 10 ₄ to give a reaction force to the side anchor 40 is limited to a certain range,受撃span S The fence height of the protection net 20 located at ₃ does not change extremely low.

<2> When fence height change shock absorbing fence non受撃span is a structure allowing free tilting of the strut 10 ₁ to 10 _4, not only the fence height of the protective net受撃span is greatly reduced As a result, the height of the protection net of the non-attack span is greatly reduced due to the free inclination of the column.

In the present invention, on the other hand, the free tilting of the strut ₁₀ 1 to 10 ₄ in the shock-absorbing fence is limited to a certain range, each post ₁₀ 1 to 10 ₄ is not tilted indefinitely.
Therefore, it struts ₁₀ 3 located受撃span _{S 3,} 10 is largest ₄ of leaning the tilt angle gradually decreases toward the strut 10 ₁ is a terminal post.
Thus, since it is suppressed freedom tilting strut ₁₀ 2, 10 ₁ located in the non受撃span _S 2, _{S 1,} required by the design conditions of the protective net 20 in the non-受撃span _S 2, _{S 1} Fence height can be secured.
Therefore, the capture performance of the protection net 20 located in the non-receiving spans S ₂ and S ₁ with respect to the succeeding falling object W ′ can be guaranteed.

5. Shock absorbing fence repair work the invention of the shock absorbing fence can not only control the operation of the plurality of shock absorbers 30 and 35 during受撃eventually guard net 20 located受撃span S _3,受撃span S ₃ buffer device 30 located upper and lower sides rope materials 21, 22 and受撃span S ₃ located has a structure that absorbs impact energy in cooperation.
Thus, when repairing a shock absorbing fence after falling rocks, replacement of the guard net 20 located受撃span S _3, the upper and lower sides of the rope materials 21 and 22 and the buffer device 30 the original state of受撃span S ₃ The shock absorbing fence can be repaired in a short time with a simple task of restoring.

[Other Examples]
The present invention is not limited to the standby type shock absorbing fences in which the upper and lower sides of the protection net 20 are supported on the upper and lower portions of the column 10, but can be applied to various known shock absorbing fences.
FIG. 5A shows a standby type shock absorbing fence in which the upper side of the protection net 20 is supported by the upper part of the support column 10 and the lower side of the protection net 20 is fixed to and supported by the mountain-side anchor 41 on the slope mountain side.
FIG. 5B shows a pocket-type shock absorbing fence in which the upper side of the protection net 20 is supported by the upper part of the column 10 and the lower side of the protection net 20 is arranged on the slope valley side.
The shock absorbing fence of the present embodiment is different from the previous embodiment only in the position of the lower side of the protective net 30, but the other configuration and the buffering action are the same as those of the previous embodiment, so that the description is omitted.
In this example, it can be applied to various types of shock absorbing fences, and is versatile.

10 ··· Support 10a · · · Middle support 10b · · · Terminal support 20 · · · Protection net 21 · · · Upper rope 22 · · · Lower rope 23 · · · Load transfer rope 24 · · · ..Side stay ropes 30... Shock absorbers 35 for upper and lower side ropes... Shock absorbers W and W 'for side stay ropes.

Claims (6)

A plurality of struts consisting of an intermediate strut and a terminal strut, an upper rope independently spanned by the span of the strut, and stretched between the upper parts of adjacent struts, and provided on a part of the upper rope, with a certain level of tension on the upper rope A shock absorbing fence having a shock absorber that attenuates tension when acted on, and a protective net whose upper side is supported by the upper side rope,
A plurality of load transmission ropes that are independent of the span of the column and lie between the tops of adjacent columns,
A lateral stay rope connected between the upper part of the terminal support and the lateral anchor,
The load transmission rope is suspended between the upper portions of the adjacent columns with a slack larger than the upper rope ,
When receiving the tilting force of the strut located in the receiving span with the lateral anchor via the load transmitting rope and the side retaining rope of the adjacent non-receiving span, the load transmitting rope of the non-receiving span Characterized in that it is configured to be able to support the tilting of the strut located in the receiving span through the load transmission time until the slack of the slack disappears ,
Shock absorbing fence. The shock absorbing fence according to claim 1, wherein a buffer device is interposed in a part of the side stay rope. The shock absorbing fence according to claim 2 , wherein the operation starting force of the buffer device of the side stay rope is larger than the operation starting force of the buffer device of the upper side rope. The shock absorbing fence according to any one of claims 1 to 3 , wherein the shock absorbing fence is a standby type in which a lower side of the protective net is supported at a lower portion of the support. The shock absorbing fence according to any one of claims 1 to 3 , wherein the shock absorbing fence has a structure in which a lower side of the protection net is fixed and supported on a slope mountain side. The shock absorbing fence according to any one of claims 1 to 3 , wherein the shock absorbing fence is a pocket type in which a lower side of the protection net is arranged on a slope valley side.

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