JP5953281B2 - Protective fence - Google Patents

Description

  The present invention relates to a protective fence that captures falling rocks, earth and sand, and the like, and more particularly to a protective fence that suppresses bending deformation in the height direction of a protective net at the time of impact.

Patent Documents 1 and 2 disclose protective fences in which the configuration of the protective net is simplified.
The protective net described in Patent Document 1 includes a wire mesh stretched between a plurality of support columns, an upper rope and a lower rope that are horizontally stretched on the upper and lower portions of the support columns, and a diagonal between adjacent support columns. A pair of reinforcing ropes stretched on the rope and a shock absorber provided at the end of each rope member.
Patent Document 1 discloses that workability is improved by using a brake element manufactured in advance as a shock absorber and attaching the brake element to both ends of a pair of reinforcing ropes on site.

  In Patent Document 2, as a means for suppressing deformation in the height direction of the protection net at the time of receiving, a plurality of interval holding materials are additionally arranged in the protection net in a vertical direction, and each interval holding material and the protection net are connected to each other. It is disclosed that the crossing portions of the loader and the wire mesh that are configured are each fixed by a fixing tool such as a clip.

JP 2012-2014 Gazette JP 2012-225036 A

The conventional protection fence has the following problems.
<1> The protective fence described in Patent Document 1 is such that when the protective net is deformed toward the sloped valley when receiving a fallen rock or the like, the upper and lower sides of the protective net positioned between the columns approach each other. Shrinks and deforms in the height direction.
When the protective net shrinks and deforms in the height direction, the capture area of the protective net decreases, so the open space formed between the lower side of the protective net and the ground, or the upper space of the protective net formed by the reduced deformation There is a risk that the following falling rocks may pass through, which is very dangerous.
<2> The protective fence of Patent Document 2 can suppress the deformation in the height direction of the protective net to some extent due to the rigidity of the spacing member.
On the other hand, a large number of spacing members and fixtures such as clips are used, so that the number of constituent members of the protective fence increases and there is a problem that the material cost increases.
Furthermore, many fixing tools must be manually installed, and it takes a lot of time and labor to install the spacing member, and it takes a long time to assemble the protective fence.
Furthermore, the use of many fixing tools such as clips increases the rigidity of the protective net, and impairs the flexibility and flexibility at the time of impact required for the protective net to exhibit the capturing function and the buffering function.
<3> The protective fences described in Patent Documents 1 and 2 have a structure in which shock absorbers are installed on a pair of diagonally arranged reinforcing ropes to absorb impacts acting on the reinforcing ropes.
In the conventional protective fence, since both ends of a pair of reinforcing ropes are fixed to the support columns and separated, if an impact is applied to only one reinforcing rope, the shock absorber on the side of the reinforcing rope that does not act will not function. The buffer absorption performance cannot be fully exhibited.
<4> For this reason, a shock absorber having a large shock absorbing performance must be used so that the shock can be absorbed even when the shock is individually applied to the pair of reinforcing ropes, which is uneconomical.

The present invention has been made in view of the above points, and the object of the present invention is to suppress bending deformation in the height direction of the protective net with a simple configuration without using a spacing member. It is to provide a protective fence.
Still another object of the present invention is to provide a safe fence that can maintain high capture performance and shock absorption performance and has high safety.

The present invention is a protective fence comprising struts erected so as to be capable of self-supporting at a predetermined interval, and a protective net stretched between the struts, the protective net between the upper portions of adjacent struts, the lower portion A cross rope having a buffering function by gripping the overlapping portion near the both ends of the rope having a length that can be bridged vertically and diagonally between and crossing, and between the support posts via the cross rope The cross rope is composed of two horizontal sections that are spanned between two horizontal portions spanned between the upper and lower portions of adjacent struts and the upper and lower diagonals of adjacent struts. Two cross sections are formed continuously, and the cross rope is stretched between adjacent struts in an approximately 8-character shape so that the tension applied to a part of the cross rope can be transmitted over the entire length of the rope. that is anchored Te And butterflies.
Furthermore, in an embodiment of the present invention, the cross rope has a loop shape, and the upper side and the lower side of the net are locked to the upper and lower horizontal portions of the cross rope.
Furthermore, in an embodiment of the present invention, a plurality of mooring elements capable of mooring the cross ropes are formed on the upper and lower portions of the struts, and the cross ropes are moored to the plurality of mooring elements and the struts are adjacent to each other. It is characterized by a horizontal cross rope.
The present invention is a protective fence comprising struts erected so as to be able to stand independently at a predetermined interval, and a protective net stretched between the struts, the protective net being between upper portions or lower portions of adjacent struts. A cross rope having a buffering function by overlapping a part of a rope having a length that can be continuously bridged vertically and diagonally crossing either one of them, and holding the overlapping part of the rope with a buffer The cross rope is configured by a net laid between the columns through the cross rope, and the cross rope is adjacent to one horizontal portion spanned between either the upper portion or the lower portion of the adjacent columns. Two cross sections that are crossed between the upper and lower diagonals of the support are formed continuously and adjacent to each other so that the tension acting on a part of the cross rope can be transmitted over the entire length of the rope. mooring pass over between the posts And an end portion of the two cross section is fixed to the upper or lower adjacent struts allowed.
Furthermore, in an embodiment of the present invention, a mooring element capable of mooring the cross rope is formed on either the upper portion or the lower portion of the support column, and the end portion of the cross rope is formed on either the upper or lower portion of the support column. The cross rope is fixed to a plurality of adjacent fixing elements while the cross rope is anchored to a plurality of adjacent fixing elements. It is characterized by a horizontal rope.
Furthermore, in an embodiment of the present invention, the cross rope has either one of the upper and lower horizontal portions and a pair of intersecting cross portions formed continuously with the horizontal portion, and the upper or lower side of the net is The cross rope is locked to the horizontal portion.
Furthermore, the embodiment of the present invention is characterized in that the cross rope is horizontally mounted between adjacent struts while sharing the struts.
Furthermore, in an embodiment of the present invention, the cross rope is constituted by a plurality of ropes and a plurality of shock absorbers holding the overlapping portions near both ends of each rope.
Furthermore, in an embodiment of the present invention, the cross rope is constituted by one rope and one buffer that holds the overlapping portion near both ends of the rope.

By having the above-described configuration, the present invention can suppress bending deformation in the height direction of the protective net with a simple configuration.
Furthermore, according to the present invention, it is possible to provide a protective fence with high impact absorption performance and capture performance.

A perspective view of a part of a protective fence according to the present invention Front view of part of the protective fence Illustration of mooring element at the top of the column Illustration of the mooring element at the bottom of the column Perspective view of shock absorber Model diagram of other forms of cross rope Model diagram of other forms of cross rope Model diagram of protective fence according to another embodiment of the present invention Model diagram of protective fence according to another embodiment of the present invention

  Embodiments of the present invention will be described below with reference to the drawings.

<1> Outline of Guard Fence FIGS. 1 and 2 show an example of a guard fence according to the present invention.
The protective fence according to the present invention includes a support column 10 that can stand independently at a predetermined interval, a net 20 that is laid across a plurality of support columns 10, and upper and lower portions of adjacent support columns 10 and 10. It includes a rope cross rope 30 that is stretched over a substantially 8-character shape in which the vertices of two regular and reverse triangles are butted together, and a shock absorber 50 that is installed in the overlapping portion of the cross rope 30.
In the present invention, the net 20 and the cross rope 30 with the buffer 50 constitute a protective net.

<2> Strut The strut 10 includes steel, concrete, or a concrete-filled steel pipe.
The lower part of the support column 10 may be any of a type embedded in the ground or foundation concrete, a type mounted on the ground surface via a ground plate, or a type configured to tilt the support column 10 via a hinge mechanism.
Moreover, you may connect between the anchor provided in the mountain side slope and the upper part of the support | pillar 10 with the reserve rope with a shock absorber as needed.

<2.1> Mooring Elements Mooring elements 11a and 11b for slidably mooring the cross rope 30 are formed on the upper and lower portions of the column 10.

The mooring elements 11 a and 11 b of the column 10 illustrated in FIGS. 3 and 4 include a short column 12 that protrudes horizontally on the outer peripheral surface of the column 10, and a single or a plurality of mooring elements 11 a and 11 b that are installed across the short column 12 and the column 10. It is constituted by the stopper 13.
The outer peripheral surface of the short column 12 is formed in the circular arc surface, and the sliding resistance with the cross rope 30 is made small.

<2.2> Position of Mooring Element Formation In this example, the mooring elements 11a and 11b of the column 10 are shown as being formed on the slope mountain side of the column 10, but they may be formed on the slope valley side of the column 10.
<2.3> Other Forms of Mooring Element Furthermore, as another form of the mooring element 11, an opening through which the cross rope 30 can be inserted is provided in the upper and lower central portions of the support column 10, and the mooring element 11 a is provided inside the support column 10. , 11b may be formed.
Further, the stopper 13 may be omitted, and a guide groove that can accommodate the cross rope 30 may be provided in the outer peripheral surface of the short column 12.
In addition, the mooring element 11 may be configured by pivotally supporting a double pulley on the upper and lower portions of the support column 10.
Alternatively, the stopper 10 may be formed on the support column 10 and the cross rope 30 may be directly wound around the upper and lower outer peripheral surfaces of the support column 10 for mooring.

<3> Cross Rope The cross rope 30 is a rope member having a length that can be bridged in an approximately eight-letter shape continuously between the upper and lower portions of adjacent struts 10 and 10 and crossing each other vertically and obliquely. Support function, the reinforcing function of the net 20, and the bending deformation suppressing function toward the height direction of the net 20.
In this example, the case where the cross rope 30 has an endless loop shape will be described.
As the cross rope 30, for example, a wire rope excellent in tensile strength and weather resistance, a resin rope, a high strength fiber rope and the like can be used.

<4> Shock absorber A shock absorber 50 is a known friction slide that holds the overlapping portion of two ropes and allows the cross rope 30 to have a shock absorbing function by allowing the rope to slide when a certain tension or more is applied. It is a dynamic shock absorber.
The shock absorber 50 illustrated in FIG. 5 includes a restraint plate 51 formed by folding the center of the spring plate, and a partition that is inserted into the restraint plate 51 and defines an accommodation space for two ropes in the interior of the expansion portion. It consists of a plate 52, bolts 53 and nuts 54 that tighten the expansion portion of the restraint plate 51 in the contraction direction.
The shock absorber 50 is not limited to the illustrated structure, and other than that, a known shock absorber constituted by two restraint plates capable of accommodating two ropes, bolts and nuts for fastening the two restraint plates, Multiple wire clips can be applied.
Furthermore, as another shock absorber 50, it is possible to apply a known shock absorber that is plastically deformed or elastically deformed when a load is applied.

<5> Net The net 20 has a substantially rectangular outer shape and may be made of metal or fiber, but from the viewpoint of strength, a wire mesh, particularly a rhombus wire mesh is preferable.

[Assembly method of protective fence]
Next, a method for assembling the protective fence will be described with reference to FIGS.

<1> Standing up the support posts A plurality of support posts 10 are set up in the middle of the slope or at the bottom of the slope with a predetermined interval.
The upper chord material 40 is placed horizontally between the upper portions of the adjacent columns 10 and 10.
The connection part of the support | pillar 10 and the upper chord material 40 is movably connected via a well-known hinge mechanism, or is rigidly connected so that it cannot move.
The upper chord material 40 is not essential and may be omitted.

<2> Routing of Cross Rope In this example, a mode in which the cross rope 30 is routed using a pair of upper and lower ropes 30a, 30b and two shock absorbers 50, 50 will be described.

<2.1> Rope routing The upper half rope 30a spans horizontally between the upper anchoring elements 11a, 11a of the adjacent struts 10, 10, and the lower half rope 30b is the lower anchorage of the adjacent struts 10, 10. It bridges horizontally between the elements 11b and 11b.

The mooring structure of the mooring elements 11a and 11b and the cross rope 30 illustrated in FIGS.
FIG. 3 shows a configuration in which the ropes 30a, 30a constituting the two adjacent pairs of cross ropes 30, 30 are wound around the circumferential surface of the short column 12 constituting the mooring element 11a at the top of the support column 10 in a shared manner. Show.
FIG. 4 shows a form in which the ropes 30b and 30b constituting the two adjacent sets of cross ropes 30 and 30 are wound around the circumferential surface of the short column 12 constituting the mooring element 11b below the support column 10 in a shared manner. Show.
The stopper 13 prevents the ropes 30a and 30b wound around the short pillar 12 from coming off.

<2.2> Installation of shock absorbers Cross portions 31, 32, which are free ends of both ropes 30a, 30b, are arranged in the diagonal direction of adjacent struts 10, 10, respectively, and are superposed. The buffer 50 is installed in 32 superposition parts, and continuity is given to a pair of upper and lower ropes 30a, 30b.

<2.3> Formation of Extra Length Portion When installing the shock absorber 50, the rope material of the cross rope 30 is extended to the tip of the shock absorber 50 to form the extra length portions 35 and 35.
The surplus length portions 35 and 35 are the sliding allowance of the cross rope 30 with respect to the shock absorber 50, and ensure an appropriate length.

<2.4> Completion of Cross Rope Routing As a result, the horizontal portions 33 and 34 of the cross rope 30 are located between the upper and lower portions of the adjacent struts 10 and 10, and the upper and lower of the adjacent struts 10 and 10 The two cross portions 31 and 32 intersect each other at an angle.

  In this example, the cross rope 30 is continuously routed between the upper and lower portions of the adjacent support columns 10 and 10 and obliquely up and down, and the shock absorber 50 is attached near both ends to make a closed shape. The cross rope 30 can be routed with a simple operation.

<3> Attaching the Net The net 20 is attached between the columns 10 and 10 adjacent to each other via the cross rope 30.
At this time, the upper side and the lower side of the net 20 are engaged with the horizontal portions 33 and 34 of the cross rope 30, respectively. The cross portions 31 and 32 of the cross rope 30 are also locked to the net 20 as necessary.
In some cases, only the upper side of the net 20 is locked to the horizontal portion 33 of the cross rope 30 for attachment.

  As a means for locking the cross rope 30 and the net, a method of inserting a rope constituting the cross rope 30 into the net of the net 20 or a spiral shape between the net 20 and the cross rope 30 arranged on one side of the net 20 is used. A method of winding and locking the connecting coil can be employed.

  The net 20 and the cross rope 30 are attached between the adjacent columns 10 and 10 to complete the assembly of the protective fence.

[Shock absorption method]
Next, the buffering function of the protective fence will be described with reference to FIG.

<1> Impact When an impact F such as falling rocks acts on a part of the protective net, the net 20 and the cross rope 30 supported by the support column 10 are deformed toward the slope valley side.
The impact F is transmitted from the net 20 to the entire length of the cross rope 30 and further transmitted from the cross rope 30 to the support column 10 and supported.

<2> Shock Absorbing Action by Protective Net Impact F acting on the protective net is in addition to the deformation resistance of the net 20 and the deformation resistance of the cross rope 30, the sliding resistance of the buffer 50 and the rope material, and the support of the support 10. It can be attenuated efficiently by force.
In particular, the cross ropes 30 disposed above and below the net 20 and obliquely effectively reinforce the entire net.

When the impact F is smaller than the sliding resistance of the shock absorber 50, the loop length of the cross rope 30 does not change, and the impact F is absorbed by the strength of the net 20 and the cross rope 30.
When the impact F exceeds the sliding resistance of the buffer 50, sliding occurs between the buffer 50 and the rope member, and the impact F is absorbed by the sliding resistance of the buffer 50.

<3> Deformation suppressing action in the height direction of the protective net In the present invention, even if the protective net is bent and deformed toward the downstream side of the slope, the cross rope 30 is directed in the height direction of the protective net as described below. Suppress deformation.

<3.1> Transmission of tension from the cross portion to the horizontal portion When an impact F acts on a part of the protective net, a tension f is generated in the cross portions 31 and 32 arranged obliquely of the cross rope 30.
The tension f generated in the cross portions 31 and 32 is distributed and transmitted to the upper and lower horizontal portions 33 and 34 of the cross rope 30 via the mooring elements 11a and 11b.
That is, the tension f is substantially uniform over the entire length of the loop of the cross rope 30.

<3.2> Tension of the horizontal portion In each of the horizontal portions 33 and 34 above and below the cross rope 30, the tension f acts as a tension force, and the horizontal portions 33 and 34 try to maintain linearity.
The tension generated in the horizontal portions 33 and 34 of the cross rope 30 increases in proportion to the impact F.

<3.3> Suppression of Deformation in the Height Direction In this way, the tension generated in each horizontal portion 33, 34 of the cross rope 30 is a deformation that tends to deform the upper and lower sides of the protective net toward each other. In order to oppose the force, deformation in the height direction of the upper and lower sides of the protective net can be effectively suppressed.

<4> About the capture area of the protection net Since the protection fence of the present invention can suppress deformation in the height direction of the upper and lower sides of the protection net at the time of impact, the capture area of the protection net is not much different from that before the impact. .
Therefore, since the subsequent falling rock can be captured by the protective net, the safety of the protective fence is improved.

<5> Shock Absorbing Performance of Protective Net Since the cross rope 30 has a structure capable of transmitting the shock F acting on a part of the loop to the entire length of the loop, the pair of cross ropes 30 can be applied to any position of the cross rope 30 regardless of the position of the shock F. Since the shock absorbers 50 and 50 can function, the shock F can be dispersed and absorbed by the plurality of shock absorbers 50 and 50.
Therefore, the shock absorbing performance of the protective net is increased.
Furthermore, even if the shock absorber 50 to be used has a low shock absorbing performance, it can sufficiently cope with it and is economical.
Furthermore, since there is no need to use many fasteners such as clips, the protection net's flexibility and flexibility are not impaired, so that the protection net's original capture and buffer functions can be fully demonstrated. It is.

<6> About the extension amount of the protective net Two sets of shock absorbers on the conventional protective fence with one shock absorber installed on one reinforcing rope stretched between the upper and lower sides of the support and the endless cross rope 30 In the protection fence of this example in which the tools 50 and 50 are interposed, the amount of protrusion toward the slope valley side of the protection net is examined.
When it is assumed that the total slip amount of the rope with respect to the impact is the same and the diagonal distance between the columns is the same, the slip length of the rope of the cross rope 30 of this example is compared with that of the conventional single reinforcement rope. About half.
Therefore, the amount of overhang of the protective fence of this example toward the sloped valley side of the protective net is greatly reduced compared to the non-loop reinforcing rope.
In other words, the protective fence of this example can be installed in the vicinity of a railroad, a road or the like because the amount of projection toward the sloped valley side of the protective net at the time of impact is small.

[Modification]
Hereinafter, modifications of the previous embodiment will be described. In the description thereof, the same parts as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The cross rope 30 may be composed of one rope, or may be composed of two or more rope materials.
FIG. 6 shows a form in which the cross rope 30 is composed of one rope and one buffer 50 provided near both ends of the rope.
FIG. 7 shows a form in which the cross rope 30 is composed of four ropes and four shock absorbers 50 provided near both ends of each rope member.
The former (FIG. 6) protective fence has the advantage that the cost of the protective fence can be reduced because the number of materials constituting the cross rope 30 is small in addition to the same effects as the above-described embodiment.
The protective fence of the latter (FIG. 7) has the advantage that the shock absorbing performance of the protective fence is increased as the number of installation of the shock absorbers 50 is increased in addition to the same effects as the above-described embodiment.

[Other Embodiments]
8 and 9 show another embodiment of the protective fence.
Also in this example, the same parts as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

<1> Outline of Guard Fence A guard fence according to this example includes a support column 10 that is erected so as to be capable of self-supporting at a predetermined interval, a net 20 that is horizontally installed between a plurality of support columns 10, and an adjacent support column 10. , 10, a rope cross rope 30 laid across the upper and lower parts, and a buffer 50 installed in the overlap portion of the rope by polymerizing a part of the cross rope 30 to protect the present embodiment. The basic configuration of the fence is the same as in the previous embodiment.
The protective fence of this example is different from the previous embodiment in that the lower horizontal portion 34 or the upper horizontal portion 33 of the cross rope 30 is omitted.
In other words, the cross rope 30 in this example is configured by either one of the upper and lower horizontal parts and a pair of cross parts that intersect.

<2> Protective fence with the lower horizontal part of the cross rope omitted (Fig. 8)
1) Overall length of cross rope This example is a protective fence in which the lower horizontal portion 34 of the cross rope 30 is omitted.
The cross rope 30 to be used has a length that can be continuously bridged between the upper portions of the adjacent struts 10 and 10 and between the upper and lower diagonals.
2) Cross rope routing configuration The upper half rope 30a is horizontally bridged between the mooring elements 11a, 11a of the upper portions of the adjacent columns 10, 10, and the respective cross portions 31, 31 which are free ends of the upper half rope 30a are connected. Each end is fixed to fixing elements 11c and 11c below the support columns 10 and 10.
In this example, each cross part 31 is extended via the extension rope 36, the lower end of the extension rope 36 is fixed to the fixing element 11 c at the lower part of the column 10, and the cushioning device is attached to the overlapping part of the cross part 31 and the extension rope 36. The form which has arrange | positioned 50 is shown.
3) Attaching the Cross Rope and the Protection Net In this example, the upper side of the net 20 is locked to the upper horizontal portion 33 of the cross rope 30.
The lower side of the net 20 is supported and locked using a separate rope.
4) Deformation suppressing action in the height direction of the protection net In this example, when tension is generated in a part of the rope (cross portion 31 and extension rope 36) obliquely crossing the cross rope 30 constituting the protection net, Since it is transmitted to the upper horizontal portion 33 of the cross rope 30 via the mooring elements 11a, 11a, deformation in the height direction of the upper side of the protective net can be effectively suppressed.

<3> Guard fence without the upper horizontal part of the cross rope (Fig. 9)
1) Overall length of cross rope This example is a protective fence in which the upper horizontal portion 33 of the cross rope 30 is omitted.
The cross rope 30 to be used has a length that can be continuously bridged between the lower portions of adjacent struts 10 and 10 and between the upper and lower diagonals.
2) Cross rope routing configuration The lower half rope 30b is horizontally bridged between the mooring elements 11b, 11b of the lower portions of the adjacent struts 10, 10, and the cross portions 32, 32 which are free ends of the lower half rope 30b are connected. Each end is fixed to fixing elements 11c and 11c at the upper part of the columns 10 and 10.
In this example, each cross part 32 is extended via the extension rope 36, and the upper end of the extension rope 36 is fixed to the fixing element 11 c on the upper part of the column 10, and the cushioning device is attached to the overlapping part of the cross part 32 and the extension rope 36. The form which has arrange | positioned 50 is shown.
3) Attaching the Cross Rope and the Protection Net In this example, the lower side of the net 20 is locked to the lower horizontal portion 34 of the cross rope 30.
The upper side of the net 20 is supported and locked using a separate rope.
4) Deformation suppressing action in the height direction of the protective net In this example, when tension is generated in a part of the rope (cross portion 32, extension rope 36) obliquely crossing the cross rope 30 constituting the protective net, Since it is transmitted to the lower horizontal portion 34 of the cross rope 30 via the mooring elements 11b, 11b, deformation in the height direction of the lower side of the protective net can be effectively suppressed.

10 ··· Post 11a · · · Mooring element 11b at the top of the column · · · Mooring element 11c at the bottom of the column · · · Fixing element 20 of the column · · · Net 30 · · · Cross Rope 30a ... Cross rope upper half rope 30b ... Cross rope lower half rope 31 ... Upper half rope cross part 32 ... Lower half rope cross part 33 ... ... Cross rope extra length 34 ... Cross rope horizontal part 35 ... Cross rope horizontal part

Claims (9)

A protective fence comprising a support column standing upright at a predetermined interval and a protection net stretched between the support columns,
The protective net has a buffering function by gripping the overlapping portions near both ends of a rope having a length that can be continuously bridged between upper and lower portions of adjacent struts and between the upper and lower sides, and the upper and lower sides thereof, with a buffer. With a cross rope,
Consists of a net laid between the columns through the cross rope,
The cross rope is formed continuously by two horizontal portions spanned between the upper and lower portions of adjacent struts and two cross portions spanned between the upper and lower diagonals of adjacent struts. And
The tension acting on the part of the cross rope so as to be transmitted over the entire length of the rope, characterized in that the cross-rope horizontally extends between adjacent struts is anchored in a substantially figure-8 shape ,
Guard fence.   2. The protective fence according to claim 1, wherein the cross rope has a loop shape, and an upper side and a lower side of the net are locked to upper and lower horizontal portions of the cross rope.   A plurality of mooring elements capable of mooring the cross rope are formed on the upper and lower parts of the support column, the cross rope is moored to the mooring element, and the cross rope is horizontally mounted between adjacent support columns. The protective fence according to claim 1 or 2. A protective fence comprising a support column standing upright at a predetermined interval and a protection net stretched between the support columns,
The protective net is formed by polymerizing a portion of a rope having a length that can be continuously bridged diagonally up and down, either between the upper part or the lower part of adjacent struts. A cross rope having a cushioning function by gripping with a cushioning tool;
Consists of a net laid between the columns through the cross rope,
The cross rope is composed of one horizontal portion spanned between either the upper portion or the lower portion of adjacent struts and two cross portions spanned across the upper and lower diagonals of adjacent struts. Formed continuously,
The upper or lower part of the adjacent struts where the ends of the two cross parts are suspended and anchored between adjacent struts so that the tension acting on a part of the cross rope can be transmitted over the entire length of the rope It is characterized by being fixed to
Guard fence.   A mooring element capable of mooring the cross rope is formed on either the upper part or the lower part of the post, and a fixing element capable of fixing the end of the cross rope is formed on either the upper part or the lower part of the post. The cross rope is anchored to a plurality of adjacent anchoring elements, the ends of the cross rope are fixed to a plurality of adjacent fixing elements, and the cross rope is horizontally mounted between adjacent struts. The protective fence according to claim 4.   The cross rope has either one of the upper and lower horizontal portions and a pair of cross portions formed continuously with the horizontal portion, and the upper or lower side of the net is locked to the horizontal portion of the cross rope. The protective fence according to claim 5, wherein   The guard fence according to any one of claims 1 to 6, wherein the cross rope is horizontally mounted between adjacent struts while sharing the struts.   8. The cross rope is configured by a plurality of ropes and a plurality of shock absorbers that grip overlapping portions near both ends of each rope. 9. Protective fence.   The cross rope is constituted by one rope and one shock absorber that grips the overlapping portion near both ends of the rope. 4. Guard fence.

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