JP6257832B1 - Protective fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective fence capable of easily removing the lower side of the blocking surface of the protective fence, opening the lower part of the blocking surface over the length of a plurality of spans, and efficiently removing the falling matter accumulated on the protective net. To provide. A protective fence in which a blocking surface can be deformed toward a valley side in a range over a plurality of spans at the time of impact, and vertical ropes 25 are stretched above and below each intermediate column 10A. An upper chord rope 20 and a lower chord rope 21 are laid horizontally between the upper portion and the lower portion of the belt 10, and a belt-like protective net 30 is attached between the upper chord rope 20 and the lower chord rope 21. When removing the flow-down material, the lower net of the vertical rope 25 is released, the lower chord rope 21 is loosened, and the mooring with the intermediate strut 10A is released, so that the protective net 30 suspended from the upper chord rope 20 and The lower string rope 21 is lifted to form an open space in a part of the protective fence. [Selection] Figure 2

Description

  The present invention relates to a protective fence provided with a protective net that catches fallen objects such as fallen earth and sand, fallen rocks, and avalanches, and more particularly to a protective fence that can remove a captured fallen object.

In a general protection fence with a protection net horizontally installed between a plurality of support posts standing on the roadside or on the slope, the protection net is arranged on the slope mountain side with respect to the support pillar. This structure absorbs the energy of collapsed objects such as rocks and earth and sand by deformation, plastic deformation of the columns on both sides, and a buffering action by a shock absorber (Patent Document 1).
If collapsed objects pile up on the slope mountain side of the protective net, the original function of the protective fence is lost, and it is necessary to remove the captured collapsed objects.
Conventional protection fences are not designed to remove accumulated fallen objects, so it is very difficult to remove the fallen objects accumulated on the mountain side of the protective net using a heavy equipment such as a backhoe introduced on the slope mountain side. there were.

Patent Document 2 discloses a protective fence that can remove collapsed objects from the valley side of the protective net.
This protective fence consists of a plurality of divided nets divided by a net-made protective net according to the span length of the struts, and the upper and lower sides of the divided nets are bridged between the top and bottom of two adjacent struts. It is connected to the lower horizontal ropes in a removable manner, and has a structure in which the divided net can be removed in span units.

JP 2014-58842 A JP 2011-47245 A

The conventional protection fence has the following problems.
<1> A large tension is applied to the whole of the divided net that has been stagnate and deformed on the slope valley side.
Under such circumstances, it is very difficult to separate the upper, lower, left and right sides of the divided network from the surroundings, and it takes much time and labor to separate the divided network.
<2> Since the removal of the divided network is a span unit of the support column, the plurality of divided networks cannot be removed at once over a plurality of spans.
<3> The removal range of fallen objects collected in the divided network is limited to the range of one span of the support column. There is a problem that it takes a lot of time and cost to remove.

The present invention has been made in view of the above points, and an object thereof is to provide the following protective fence.
<1> The protective fence can be opened over a range of multiple spans with simple work.
<2> The time and cost required to remove the flowed-down material can be reduced.

The present invention includes a plurality of struts (intermediate struts and terminal struts) erected at intervals, an upper strut between the upper and lower troughs of the strut, a lower chord rope, and an upper and lower chord rope And a protection fence that is formed by an upper chord rope, a lower chord rope, and a protective net, and that can be deformed toward the valley side over a plurality of spans upon receiving. It is.
In the protective fence, the vertical rope is stretched vertically on the valley side peripheral surface of the intermediate strut, the lower portion of the vertical rope is detachably attached to the lower portion of the intermediate strut, and the lower chord rope is the intermediate strut It is moored so as to be able to be engaged and disengaged in a guide groove provided in the lower part.
When removing the falling material, release the connection between the lower part of the vertical rope and the lower part of the intermediate strut, loosen the lower chord rope, release the mooring of the lower chord rope and the lower part of the intermediate strut, and hang down the upper chord rope. By lifting up the formed protective net and the lower chord rope, it is possible to efficiently remove the flow-through through an open space formed in a part of the protective fence over a plurality of spans.
In another embodiment of the present invention, a pair of mooring brackets project from the valley-side peripheral surface of the lower part of the intermediate strut with a space therebetween, and guide grooves into which the lower chord rope can be taken in and out are respectively formed in the pair of mooring brackets. . If the pair of guide grooves are formed upside down, the lower chord rope will not easily come off the guide grooves at the time of impact.
In another embodiment of the present invention, a pair of support brackets project from the upper and lower portions of the valley-side peripheral surface of the intermediate strut, and a vertical rope is stretched between the pair of support brackets via a shock absorber. . A shock absorber may be interposed at the intersection of the lower portion of the intermediate strut and the lower chord rope, or a shock absorber may be interposed between the end portions of the upper chord rope and the lower chord rope and the terminal strut.
In another embodiment of the present invention, a plurality of net holding ropes that suppress deformation of the protective net may be additionally routed between the span intermediate position of the upper chord rope and the lower chord rope and the mountain side anchor. A shock absorber may be interposed between the net holding rope and the mountain side anchor.

The present invention has at least one of the following effects.
<1> With a simple operation that simply performs the mooring release operation of the lower chord rope and the connection release operation of the lower part of the vertical rope, the blocking surface is lifted to form an open space that spans a plurality of spans in a part of the protective fence. be able to.
<2> Since the range over multiple spans can be opened as an open space, it is possible to remove collapsible material deposited on the protective net more efficiently and remove collapsing material than when removing the divided nets in units of strut spans. The time and cost required for the removal of objects can be greatly reduced.
<3> When a guide groove is formed on a pair of mooring brackets projecting from the lower part of the intermediate strut, the lower chord rope can be prevented from coming off at the time of impact by turning the shape of each pair of guide grooves upside down. be able to.
<4> The lower chord rope moored to the pair of mooring brackets can be easily removed by loosening the lower chord rope positioned between the pair of mooring brackets using a rope loader or the like.
<5> If a net retaining rope with a shock absorber is additionally provided in the protective net, the net retaining rope becomes a deformation resistance when the upper and lower sides of the blocking surface of the protective net are deformed toward the valley side. In addition to being able to suppress overhang deformation, the shock absorbing function of the shock absorber provided in the net holding rope further increases the ability to absorb the collapsing energy by the protective net.

The perspective view of the intermediate part of the protection fence which concerns on this invention The perspective view of the edge part of the protection fence which concerns on this invention Enlarged perspective view of the middle part of the protective fence with some parts omitted It is explanatory drawing of the latching structure of a lower chord rope, (A) is a side view of a mooring bracket, (B) is sectional drawing of BB in (A). Cross-sectional model diagram of a protective fence when capturing a fallen object Cross-section model diagram of protective fence in removing fallen objects Cross-sectional model diagram of guard fence according to other embodiment 2

  The present invention will be described with reference to the drawings.

<1> Outline of Guard Fence Referring to FIGS. 1A and 1B, the guard fence according to the present invention includes a column 10 (intermediate column 10A and terminal column 10B) erected at intervals, and each intermediate column 10A. A vertical rope 25 stretched vertically on the peripheral surface of the trough side, and a transverse rope between the upper part and the lower part of the plurality of struts 10, respectively, and the lower chord ropes 20, 21; And at least a protective net 30 attached to the column 10 via lower string ropes 20 and 21 and a vertical rope 25.

  The guard fence on which the present invention is premised is that the belt-like blocking surface composed of the upper and lower chord ropes 20 and 21 and the protection net 30 is located on the valley side of the support column 10 and is blocked within a range spanning multiple spans at the time of impact. Any configuration may be used as long as the surface can be deformed toward the valley side.

The upper and lower sides of the protective net 30 are attached between the intermediate strut 10A and the terminal post 10B adjacent to each other via the lower chord ropes 20 and 21, and the left and right sides of the protective net 30 are attached to the terminal post 10B.
The upper string rope 20 supports the protective net 30 via the vertical rope 25.
The lower chord rope 21 attached along the lower side of the protective net 30 is detachably attached to the lower portion of the intermediate strut 10A.
The lower part of the vertical rope 25 suspended from the upper part of the intermediate column 10A can be attached to and detached from the lower part of the intermediate column 10A.
It is possible to lift the protective net 30 by releasing the mooring of the lower chord rope 21 and removing the lower portion of the vertical rope 25 from the intermediate strut 10A.
The details of the protective fence will be described below.

<2> Struts The well-known struts such as steel pipes, concrete-filled steel pipes, concrete pillars, H steel, etc. can be applied to the intermediate struts 10A and the terminal struts 10B.
The upright means of the support column 10 may be any of a built-in type on a natural ground, an embedded type in foundation concrete, and a non-built-up type that contacts the ground via a bearing plate provided at the lower end of the support column.
Furthermore, the support column 10 may be configured to be tiltable via a hinge mechanism or the like.

<2.1> Vertical Rope Support brackets 14, 15 project from the upper and lower portions of the outer peripheral surface of the valley side of the intermediate strut 10 </ b> A to face each other, and the vertical rope 25 is interposed between the pair of support brackets 14, 15. Is stretched vertically.
An upper portion of the vertical rope 25 is suspended from the upper support bracket 14, and a lower portion thereof is detachably attached to the lower support bracket 15.
In the present embodiment shows an embodiment in which the attachment holding the ends close to the vertical rope 25 with the buffer device B _1, the buffer device B ₁ represents not essential, dampener either one of the upper and lower portions of the vertical rope 25 B ₁ the may be installed, the upper and lower portions of the vertical rope 25 may be attached directly to the support brackets 14 and 15 are omitted buffer device B _1.

<2.2> Attaching / detaching means for the lower part of the vertical rope For example, when the lower part of the vertical rope 25 penetrating the lower support bracket 15 is fixed with a bolt-type fixing tool, The lower part can be easily removed from the lower support bracket 15.
In the case of holding the lower portion of the vertical rope 25 with the buffer device B _1, it can be removed by opening the buffer device B ₁ at the bottom of the vertical rope 25 from the lower support bracket 15.

<2.3> Strut retainer rope Although not shown, a strut retainer rope is disposed and supported between the head of each strut 10 and the mountain side anchor, and a shock absorber is attached to the strut retainer rope as necessary. To intervene.
Further, a strut holding rope may be additionally provided between the head of each strut 10 and the valley anchor.

<3> Upper and Lower String Rope Upper and lower chord ropes 20 and 21 are attached along the upper and lower sides of the protective net 30, respectively.
The upper chord rope 20 the intersection of the vertical rope 25 is non-slidable through the fastener 22, or slidably coupled, slidably mounted terminal posts 10B through the end of the buffer device B ₂ Or is attached non-slidable.
Moon rope 21 via a disengagement structure provided in the lower portion of the intermediate strut 10A disengageably attached, or its end slidably mounted terminal posts 10B through the buffer device B _2, or It is attached so that it cannot slide.

<3.1> Engaging / Removing Structure of Lower String Rope The lower chord rope 21 can slide along the longitudinal direction of the rope with respect to the intermediate strut 10A, and the lower chord rope 21 can be engaged with and disengaged from the lower part of the intermediate strut 10A. It is.

2 and 3, a pair of left and right sides in which a crank-shaped guide groove 12 and an inverted crank-shaped guide groove 13 are formed on the outer peripheral surface of the valley below the intermediate strut 10A will be described. The mooring brackets 11a and 11b are projected at an appropriate interval.
Each of the guide grooves 12 and 13 is a bottomed groove that allows the lower chord rope 21 to be engaged and disengaged, and has a combination of upside down in order to increase the effect of preventing the lower chord rope 21 from being detached at the time of impact.
The shape of each guide groove 12, 13 is not limited to the illustrated crank shape, and may be a saddle shape, as long as it is a combination of groove shapes that can be prevented from coming off from the pair of mooring brackets 11a, 11b at the time of impact.
In this example, a mode in which the mooring brackets 11a and 11b are used as a pair will be described, but the mooring brackets are not limited to two but may be one or three or more.

<3.2> Method of Engaging / Removing Lower String Rope The lower string rope 21 can be moored between the pair of mooring brackets 11a and 11b by being fitted into the guide grooves 12 and 13 in a relaxed state, and the lower string in a relaxed state. By pulling the rope 21 out of the guide grooves 12 and 13, the mooring with the pair of mooring brackets 11a and 11b can be released.

<3.3> Attaching Means for Mooring Bracket In this example, a pair of left and right mooring brackets 11a and 11b is shown welded and fixed to the outer peripheral surface of intermediate strut 10A, but a pair of left and right mooring brackets 11a is combined with a band member. 11b may be attached to the intermediate column 10A.

<3.4> Relationship Between Vertical Rope and Cross Rope The intersection of the upper chord rope 20 and the vertical rope 25 is connected through a fixture 22 so as not to be slidable or slidable.
The intersection of the lower chord rope 21 and the vertical rope 25 may be crossed without being fixed, but may be fixed by the fixing tool 22.

<3.5> Connection Structure of Vertical Rope and Protection Net The intersection of the vertical rope 25 and the protection net 30 is slidably connected via a connection coil and clips.

<4> Protective Net The protective net 30 is a known net-like object that can be laid across three or more struts 10.
In this example, a description will be given of a configuration in which the protective net 30 is configured by a plurality of intermediate horizontal ropes 31 that are horizontally mounted between adjacent support columns 10 and a net 32 that is superposed on the plurality of intermediate horizontal ropes 31. To do.
If necessary, a known rope holding member may be additionally installed, and the intersections of the holding members arranged vertically and the plurality of intermediate horizontal ropes 31 may be fixed.
Intersections between the intermediate horizontal ropes 31 and the vertical ropes 25 disposed on the valley side of the intermediate support column 10A are slidably or slidably connected via the connector 23.
In the present embodiment shows the configuration in which the end portion mounted slidably through the buffer device B ₃ to the terminal post 10B of the intermediate horizontal ropes 31, the ends of each intermediate horizontal ropes 31 a shock absorber B ₃ It may be omitted so that it cannot be slid.

In addition to the example shown in this example, the protection net 30 is knitted by crossing a plurality of rope materials in the vertical and horizontal directions, or a rope net knitted by crossing a plurality of rope materials in an oblique direction (at the intersection of the rope materials). (Including nets with shock absorbers), ring nets made by connecting a plurality of single rings in contact with each other, and one type of wire mesh (rhombus wire mesh, high-strength wire mesh, etc.), or any combination of these Includes known nets.
The net material is not limited to metal but may be made of fiber or resin.

<5> Shock Absorber The shock absorbers B _{1 to} B ₃ described above are not only friction resistance type shock absorbers that can absorb the tension by sliding the rope when a tension higher than the set tension is applied. A shock absorber of the type can also be applied.
Note that the shock absorbers B _{1 to} B ₃ may be omitted.

[Protective fence receiving characteristics]
Next, the receiving characteristics of the protective fence will be described.

<1> Capture of falling rocks etc. Referring to FIG. 4, when a fallen object 40 such as falling rocks falls toward the protective fence, the fallen object 40 hits a part of the protective net 30, and the protective net 30 is The trapped fallen objects 40 accumulate on the mountain side surface of the protective net 30 while the entire blocking surface including the deformation is deformed toward the valley side.

<2> Deformation range of the blocking surface The conventional guard fence with the blocking surface located on the hill side of the column has a structure that receives impact force such as falling rocks in the span unit of the column. It was limited to the span length.

In contrast, in the guard fence of this example, the blocking surface composed of the guard net 30 and the upper and lower chord ropes 20 and 21 can be separated to the valley side of the intermediate strut 10A via the vertical rope 25, and the upper and lower chord ropes. Since it is attached so as to be movable along the longitudinal direction of 20, 21, the collapsed object 40 can be received beyond the span length of the column 10.
In other words, the range in which the blocking surface including the protective net 30 projects and deforms toward the valley side is not limited to the span length of the intermediate strut 10A.

<3> Absorption of collapse energy The collapse load acting on the protective net 30 is transmitted to the upper and lower chord ropes 20 and 21.
The collapsing load transmitted to the upper chord rope 20 is transmitted to the upper portion of the intermediate strut 10A via the vertical rope 25 and is also transmitted to and supported by the upper portion of the terminal strut 10B.
The collapsing load transmitted to the lower chord rope 21 is transmitted to the lower portion of the intermediate strut 10A via the mooring brackets 11a and 11b, and is also transmitted to and supported by the lower portion of the terminal strut 10B.
Since the guard fence of this example has a structure that can receive the collapsed object 40 beyond the span of the support column 10, the upper chord rope 20 and the lower chord rope 21 can transmit the load over the entire length of each rope, and the protective net 30 is also provided. Load transmission is possible over the entire length.
Therefore, the collapse load applied to a part of the protective net 30 can be efficiently absorbed by the entire protective fence.

[How to remove fallen objects]
Next, a method for removing the fallen objects captured by the protective fence will be described.

<1> Removal of Lower Vertical Rope As shown in FIG. 4, when the guard fence captures the collapsed object 40, tension is generated in the guard net 30 deformed to the valley side.
Therefore, the lower portion of the vertical rope 25 is removed from the lower support bracket 15 and separated from the lower portion of the intermediate strut 10A. The upper portion of the vertical rope 25 is left suspended from the upper support bracket 14 of the intermediate support 10A.

<2> Canceling mooring of the lower chord rope Next, the lower chord rope 21 positioned between the pair of mooring brackets 11a and 11b is forcibly tensioned toward the loosening direction by forcibly applying an external force, and the lower chord rope 21 is kept loose. It is bent and extracted from the guide grooves 12 and 13, and the mooring between the lower chord rope 21 and the mooring brackets 11a and 11b is released.
The intermediate portion of the lower chord rope 21 can be easily extracted from the guide grooves 12 and 13 simply by slackening the lower chord rope 21 to approximately the same distance as the opposing distance between the pair of mooring brackets 11a and 11b.

In order to loosen the lower chord rope 21 in a loaded state, for example, a known wire crusher such as a lashing device is used. The tension of the lower chord rope 21 spanned between the pair of mooring brackets 11a and 11b is obtained by gripping and tightening the two portions of the lower chord rope 21 positioned outside the pair of mooring brackets 11a and 11b with a wire compaction machine. Easy to loosen.
The fastening means of the lower chord rope 21 is not limited to the wire loader, and a known tensioning means can be applied.

The work for removing the lower portion of the vertical rope 25 and the work for releasing the mooring of the lower chord rope 21 may be performed in the reverse order.
By removing the lower portion of the vertical rope 25 and the lower chord rope 21 from the lower portion of the intermediate strut 10A, the blocking surface including the protective net 30 is suspended from the upper chord rope 20.

<3> Lifting up of the blocking surface By releasing the mooring of the lower part of the adjacent intermediate strut 10A and the lower chord rope 21, the lower side of the blocking surface becomes free like a curtain.
Since the lower side of the blocking surface becomes free, a part of the collapsed object 40 accumulated on the mountain side of the protective net 30 pushes the protective net 30 toward the valley side by its own weight and collapses.
The vertical rope 25 is lifted together with the lower chord rope 21 and the protective net 30 by an amount necessary for the removal work of the collapsed object 40 to form an open space S between the adjacent columns 10.

<4> Range of forming open space While removing the lower part of the vertical rope 25 from the lower part of the intermediate strut 10A and releasing the mooring between the lower part of the intermediate strut 10A and the lower chord rope 21, the blocking surface straddling the intermediate strut 10A Can be raised.
Therefore, a wide open space S extending over a plurality of spans can be formed on both the left and right sides of the support column 10.
In other words, in the present invention, the open space S can be formed in a part of the protective fence without being limited by the span length of the column 10.

<5> Removal of fallen objects An excavator such as a backhoe is introduced to the valley side of the protective fence, and the fallen objects 40 accumulated through the open space S are removed.
When removing the fallen object 40, a part of the blocking surface is opened through the open space S formed over a plurality of spans of the support column 10, so that the collapsed object 40 accumulates over a plurality of spans of the support column 10. Even so, a plurality of excavators can be introduced to efficiently remove the fallen objects 40, and the time and cost required for removing the fallen objects can be greatly reduced.

<6> Restoration of Guard Fence After completing the removal work of the fallen object 40, the guard net 30 that has been raised is returned to its original construction position, the lower part of the vertical rope 25 is attached to the lower part of the intermediate strut 10A, and the lower chord rope 21 The intermediate part is moored to the lower part of the intermediate support 10A to restore the protective fence.

[Other Example 1]
In the previous embodiment, as shown in FIG. 2, the form in which the lower chord rope 21 is slidably moored with respect to the pair of mooring brackets 11 a and 11 b protruding from the lower portion of the intermediate column 10 </ b> A has been described. A shock absorber (not shown) that can restrain free lateral movement of the lower chord rope 21 may be provided at the intersection of the lower portion of the support column 10A and the lower chord rope 21.

<1> Shock Absorber This shock absorber can be applied to any known friction sliding shock absorber that grips the lower chord rope 21 and allows the lower chord rope 21 to slide when a predetermined gripping force is exceeded. it can.
The shock absorber is disposed so as to be able to contact the inner side surface or the outer side surface of the pair of mooring brackets 11a and 11b so that a reaction force of tension acting on the lower chord rope 21 can be obtained from the mooring brackets 11a and 11b.
A reinforcing plate may be attached between the tip side surfaces of the pair of mooring brackets 11a and 11b shown in FIG. 2 (B) to form a U-shaped plane, thereby increasing the supporting strength of the mooring brackets 11a and 11b.

<2> Advantages of this example By installing a shock absorber at the intersection of the lower part of the intermediate strut 10A and the lower chord rope 21, the sliding resistance of the lower chord rope 21 is increased and the ability to absorb the collapsing energy by the blocking surface is enhanced. .

[Other Example 2]
With reference to FIG. 6, another protective fence in which net retaining ropes 50 and 51 with shock absorber B ₄ are additionally provided in the protective net 30 will be described.

<1> Net retainer rope In this example, a plurality of net retainer ropes 50 and 51 are slid at intermediate positions between upper and lower chord ropes 20 and 21 as means for suppressing the overhang deformation of the protective net 30 toward the valley side. incapable connected, by fixing the base ends of the plurality of nets ahead ropes 50 and 51 in the mountain side anchor a _1, on and to support the lower chord ropes 20, 21 directly.
The connection position of the net holding ropes 50 and 51 is preferably the center of the span where the deformation of the upper and lower chord ropes 20 and 21 is the largest.
The connection destinations at the tips of the net holding ropes 50 and 51 are not limited to the upper and lower chord ropes 20 and 21, and may be connected to the upper and lower portions of the protective net 30.

<2> Effect of this example Since the plurality of net holding ropes 50 and 51 have a large deformation resistance when the upper and lower sides of the blocking surface are largely deformed toward the valley side, the blocking surface projects toward the valley side. Not only can the deformation be suppressed, but also when the shock absorber B ₄ is interposed in a part of each net holding rope 50, 51, the ability to absorb the collapsing energy by the blocking surface is further enhanced.

S · · · · · · · open spaces _A 1 · · · · · · mountain anchor _B 1 _~B 4 ··· dampener 10 ----- struts 10A · · · · intermediate struts 10B · · · · terminal Post 11a ... Mooring bracket 11b ... Mooring bracket 12 ... Guide groove 13 ... Guide groove 14, 15 ... Support bracket 20 ... Upper string rope 21 ... .... Lower string rope 22 ... Fixture 25 ... Vertical rope 30 ... Protective net 40 ... Collapsed objects 50, 51

Claims (8)

Intermediate struts erected with a gap between the terminal struts, vertical ropes stretched vertically on the valley side peripheral surface of the intermediate struts, and arranged on the trough side of the intermediate struts, via the vertical ropes The upper chord rope, which is horizontally mounted on the upper part of the intermediate strut and supported at both ends by the terminal strut, is placed on the valley side of the intermediate strut, and is laid across the lower part of the intermediate strut so that it can be moved laterally. The lower chord rope, and a protective net attached between the upper chord rope and the lower chord rope, and a blocking surface composed of the upper chord rope, the lower chord rope and the protective net has a plurality of spans when receiving It is a protective fence that can be deformed toward the valley side over a range,
The lower part of the vertical rope that restricts deformation of the blocking surface toward the valley side is detachably attached to the lower part of the intermediate strut,
The lower string rope is detachably moored in a guide groove provided in the lower part of the intermediate support column,
The upper chord is formed so that an open space over a plurality of spans can be formed by releasing the connection between the lower portion of the vertical rope and the lower portion of the intermediate strut and releasing the mooring between the lower chord rope and the lower portion of the intermediate strut. It is possible to lift up the protection net hanging from the rope and the lower string rope,
Guard fence.   A pair of mooring brackets project from the valley-side peripheral surface of the lower part of the intermediate strut with a space therebetween, and a guide groove is formed on each of the pair of mooring brackets so that the lower chord rope can be engaged and disengaged. The protective fence according to claim 1.   3. The protective fence according to claim 2, wherein the pair of guide grooves into which the lower chord rope can be inserted are bent bottoms having the same shape, and the pair of guide grooves are formed upside down. .   The shock absorber which can restrain the free lateral movement of a lower chord rope is installed in the intersection of the lower part of a middle strut, and a lower chord rope, It is characterized by the above-mentioned. Guard fence.   The pair of support brackets project from the upper and lower portions of the valley side peripheral surface of the intermediate strut, and a vertical rope is stretched between the pair of support brackets via a shock absorber. The protective fence according to 1.   The protective fence according to any one of claims 1 to 4, wherein a shock absorber is interposed between ends of the upper chord rope and the lower chord rope and a terminal column.   7. A plurality of net holding ropes that suppress deformation of a protective net are arranged between a span intermediate position of the upper chord rope and the lower chord rope and a mountain-side anchor. Guard fence as described in.   The protective fence according to claim 7, wherein a shock absorber is interposed between the net holding rope and the mountain side anchor.

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