JP5636136B1 - Protective fence - Google Patents

Abstract

[Abstract] [Problem] To maintain a post in a fixed position while maintaining the posture of the post with a simple structure. [Solution] A pair of mountain-side retaining ropes 32, 32 having a V shape are stretched between the mountain-side slope of each column 20 and the column head, and a reverse V is provided between the valley-side slope of each column 20 and the column head. A pair of valley-side oblique ropes 33, 33 having a letter shape is stretched, and a plurality of valley-side oblique ropes 33, 33 are used to constrain the net 31 constituting the protective net, and a plurality of mountain-side holding ropes 32 and a plurality of valleys The side inclined rope 33 was connected to the head of the column to hold the column 20 in a fixed position.

Description

  The present invention relates to a pocket-type protective fence that guides collapsed objects such as avalanches, landslides, and rocks to the downstream of a safe slope.

Pocket type protective fences are widely known (Patent Documents 1 to 3).
Referring to FIG. 9, the conventional protective fence includes a plurality of support columns 1 standing on an inclined surface with an interval, and a protection net 2 hanging in a curtain shape between the heads of the plurality of support columns 1. .
One head rope 4 is connected to the head of each pole 1, and each pole 1 is supported by a head rope 4 and a mountain anchor 3 to which the base end of the head rope is fixed.
The protective net 2 includes a metal mesh 5 having a size capable of covering a wide range of slopes, and a plurality of vertical ropes 6 and a plurality of horizontal ropes 7 which are assembled in the vertical and horizontal directions over the entire surface of the metal mesh 5.
A plurality of anchors 8 are provided on the side slopes on the left and right sides of the protective net 2, and both ends of the lateral rope 7 are fixed to the anchors 8.
A space is formed between the protective net 2 and the slope, and the space above the protective net 2 is the widest, and the internal space gradually decreases toward the bottom of the protective net 2.
The conventional protective fence has a structure in which a fallen object is received into the inner space of the protection net 2 through the open space above the protection net 2 and the fall energy of the fallen object is attenuated by the frictional resistance between the slope and the protection net 2. .
In the conventional protective fence, the pillar 1 is supported by the mountain-side anchor 3 to which the base end of the holding rope 4 is fixed, and the plurality of horizontal ropes 7 that are horizontally mounted on the wire mesh 5 and the plurality of anchors 8 that are fixed at both ends of the horizontal rope 7. Thus, the deformation of the protective net 2 is constrained.

JP 7-216830 A JP 2011-80225 A JP 2013-2170209 A

The conventional protection fence has the following problems.
<1> The guard fences disclosed in Patent Documents 1 to 3 are provided with one mountain-side anchor 3 on the mountain-side slope directly above the column 1 in order to support one column 1 in principle. The structure is supported by one stay rope 4 connected between the heads of one column.
Therefore, the support column 1 tends to tilt at the time of impact, and if the support column 1 tilts, the impact absorbing performance of the protective net 2 is adversely affected.
<2> In order to constrain the deformation of the protective net 2, it is necessary to install a large number of anchors 8 on the slope and fix both ends of each lateral rope 7 to the anchors 8.
Installation of the anchor 8 on a steep slope is extremely difficult, and the anchor work takes a lot of time, labor and cost.
<3> In order to arrange a plurality of vertical and horizontal ropes 6 and 7 over the entire wire mesh 5, it is necessary to use long ropes, and the intersections of the vertical and horizontal ropes 6 and 7 are connected to clips or the like. It must be fixed with a fixing tool, and much time and labor are required for assembling the protective net 2.
<4> Since the plurality of vertical ropes 6 are in a free state without their lower ends being fixed to the slope, they cannot sufficiently exert the deformation suppressing action of the protective net 2.
In particular, since the vertical rope 6a positioned between the adjacent struts 1 and 1 is not directly connected to the strut 1 so as to be able to transmit a load, the deformation suppressing action of the protective net 2 can hardly be exhibited.

The present invention has been made in view of the above points, and an object of the present invention is to provide a protective fence capable of holding a column in a fixed position while maintaining the posture of the column with a simple structure.
Still another object of the present invention is to provide a protective fence that can restrain deformation of the protective net without installing a horizontal rope.

The present invention comprises a plurality of struts erected on an inclined surface with an interval, and a protective net suspended between the heads of the plurality of supporting columns, and a protective net and an inclined surface arranged with the lower end directed toward the bottom of the inclined surface. It is assumed that the protective net has a pocket in which the space gradually narrows toward the bottom of the protective net.
A plurality of mountain side ropes are stretched between the mountain side slopes and the column heads of each column, and a pair of valley side diagonal ropes are arranged so as to form an inverted V shape between the valley side slopes and column heads of each column. Multiple sets of trough- side oblique ropes are set.
The protective net and belt-shaped mesh member which is suspended between the head of the plurality of struts, and said net assembly separately from, while covering the upper surface of the network element, along a direction vertical to the diagonal net-body The plurality of sets of trough-side oblique ropes that are arranged and can restrain deformation of the mesh body.
At least the plurality of mountain side holding ropes and the plurality of valley slant ropes are stretched and connected to the column heads so that a plurality of supporting forces act in a direction opposite to the column heads. Hold the column in place.
In another embodiment of the present invention, a plurality of mountain side hook ropes, each having a pair of mountain side hook ropes stretched so as to present a V shape between the mountain slope of the pole and the head of the pole, and inverted V-shapes. It may be stretched in combination with a plurality of sets of valley side oblique ropes to be presented.
In another embodiment of the present invention, a plurality of mountain-side anchors are provided at intervals on the mountain-side slope of the column, and the base ends of the plurality of mountain-side holding ropes are fixed by sharing the mountain-side anchors.
In another embodiment of the present invention, a plurality of valley-side anchors are provided at intervals on the valley-side slope of the support column, and the base ends of the plurality of valley-side oblique ropes are fixed by sharing the valley-side anchors.
In another embodiment of the present invention, a hinge mechanism may be provided on the base portion of the support column to allow tilting of the support column.
In another embodiment of the present invention, a spacing member is horizontally placed between the heads of the adjacent struts, and a side holding rope is stretched between the head of the supporting strut at the end and the side slope. Gives continuity to the holding material.

Since the present invention has the above-described configuration, it has at least one of the following effects.
<1> A simple structure in which a plurality of mountain-side retaining ropes and a plurality of sets of valley-side oblique ropes are connected to the heads of the columns so that a plurality of supporting forces act in directions opposite to the heads of the columns. Thus, it is possible to hold the column in a fixed position while maintaining the posture of the column.
<2> The deformation of the mesh body can be effectively restrained by arranging a plurality of sets of trough-side oblique ropes along the direction of obliquely cutting the mesh body.
Therefore, since the deformation of the protective net can be restrained without using a large number of horizontal ropes, not only a large number of horizontal ropes but also anchors for fixing both ends of each horizontal rope become unnecessary.
<3> Since a stable posture of the support can be maintained even if the height of the support is increased, it is suitable for increasing the size of the protective fence.
<4> Plural valley-side slanted ropes stretched between the trough-side slopes of the struts and the strut heads have both the reinforcement function of the mesh body, the holding rope function of the struts, and the deformation restraining function of the mesh body Also, use multiple types of ropes.
Therefore, the length of the rope used for the protective fence can be greatly reduced, and the construction cost and the construction period can be shortened.

Overall perspective view of a protective fence according to the present invention Plane model diagram of the protective fence Sectional view of III-III in Fig. 2 Exploded view of the hinge mechanism of the base of the column with a part omitted Perspective view of the column head with some parts omitted Plane model diagram of a protective fence with some parts omitted to explain the support form of the column Plane model diagram of the guard fence with some parts omitted to explain the other support forms of the column Plane model diagram of the guard fence with some parts omitted to explain the other support forms of the column Plane model diagram of guard fence assumed by the present invention

  An embodiment of the present invention will be described with reference to FIGS.

<1> Overview of Guard Fences Referring to FIGS. 1 to 3, a guard fence according to the present invention includes a plurality of support columns 20 erected on an inclined surface 10 at intervals, and the heads of these support columns 20. A plurality of mountain-side anchors 11 provided on the slope mountain side of the support column 20, a plurality of valley-side anchors 12 provided on the slope valley side of the network body 30, and a pair of left and right mountain-side anchors 11, 11. A plurality of pairs of mountain side cable ropes 32, which are a pair of mountain side cable ropes 32, 32 stretched in a V shape between the heads of each column 20, a pair of left and right valley anchors 12, 12, and each column 20 A plurality of sets of trough-side slanted ropes 33, each having a pair of trough-side slanted ropes 33, 33 stretched in an inverted V shape between the heads.
A spacing member 34 is disposed between the heads of the adjacent struts 20, and the side anchors 13 provided on the side slopes of the terminal struts 20 and the heads of the terminal struts 20 are lateral. A holding rope 35 is stretched.
The protective net 30 includes a net body 31 and a plurality of sets of valley-side oblique ropes 33.
Each strut 20 is supported so that the strut 20 can be held in a fixed position by connecting at least the mountain side holding ropes 32, 32 and the plurality of valley side oblique ropes 33, 33 to the head of the strut 20.
Hereinafter, each member constituting the protective fence will be described in detail.

<2> Strut The strut 20 is a strut having high bending strength and high compressive strength for hanging the protective net 30. For example, H steel, box steel, steel pipe, concrete-filled steel pipe, or the like is applicable.

<2.1> Hinge mechanism The support column 20 has a known hinge mechanism 21 at its base, and can be tilted with respect to the inclined direction or all directions of the inclined surface 10.
An example of the hinge mechanism 21 is shown in FIGS. The hinge mechanism 21 of this example includes a bracket 22 formed integrally with the lower portion of the support column 20, a substrate 24 on which the bracket 23 is erected, and a support shaft 25 that pivotally supports the brackets 22 and 23.
The substrate 22 is fixed to the inclined surface 10 by driving pins 26, for example.
The hinge mechanism 21 is not essential, and the support column 20 may be erected in a non-tilting manner.

<2.2> Other fixing method of the lower part of the support column As another fixing method of the lower part of the support column 20, for example, the lower part of the support column 20 is directly embedded in the slope 10 or is erected, or is attached to the foundation concrete provided on the slope. The lower part of 20 can be embed | buried upright and a well-known fixing method can be applied.

<3> Anchor The mountain side anchor 11, the valley side anchor 12, and the side anchor 13 are anchors made of a well-known steel rod or rope excellent in anchor strength.
Each of these anchors 11, 12, and 13 includes anchors constructed on the slope 10 and installed on the foundation concrete, in addition to those anchored directly on the slope 10.
The anchors 11, 12, and 13 are appropriately selected in consideration of an assumed impact load of a collapsed object.

<3.1> Mountain Side Anchor The mountain side anchor 11 is an anchor for fixing one end of the mountain side holding rope 32, and is provided at a position away from the vertical line passing through the center of the column 20.
When provided as a pair, the mountain-side anchors 11 are provided on the slope mountain side of the column 20 and at a position obliquely above and to the left and right of the column 20.
In this example, a configuration is shown in which one mountain-side anchor 11 is shared and the two mountain-side anchor ropes 32 and 32 are fixed, but the mountain-side anchor rope 11 may be provided for each mountain-side anchor rope 32 without sharing the mountain-side anchor 11. Good.

<3.2> Valley-side Anchor The valley-side anchor 12 is an anchor for fixing one end of the valley-side oblique rope 33, and is provided at a position away from the vertical line passing through the center of the support column 20.
When provided as a pair, the trough anchors 12, 12 are provided on the slope trough side of the support column 20 and at a position obliquely below the left and right with respect to the support column 20.
In this example, a configuration is shown in which one valley-side anchor 12 is shared and two valley-side oblique ropes 33 and 33 are fixed, but the valley-side anchor 12 is not shared and the valley-side oblique rope 33 is shared for each valley-side oblique rope 33. 12 may be provided.

<3.3> Side Anchor The side anchor 13 is an anchor for fixing one end of the side holding rope 35, and is provided on the side slope of the column 20.

<4> Rope for supporting the head of the column The rope for supporting the head of the column 20 will be described in detail below.

<4.1> Mountain Side Retaining Rope A pair of mountain side reserving ropes 32, 32 is a reserving rope stretched between the pair of mountain side anchors 11, 11 and the head of the column 20, and a pair of trough side oblique ropes 33, 33 It functions in cooperation to ensure a stable posture of the column 20.

<4.2> Valley side oblique rope In the present invention, in order to hold the posture of the support column 20 more stably and to reduce the amount of rope used and the number of anchors by using the rope together, the head of the support column 20 And a pair of valley-side inclined ropes 33, 33 are stretched between the pair of valley-side anchors 12, 12.
In general, when an impact load is applied to the protective net 30, there is a case where the support column 20 tilts toward the slope mountain side due to the reaction, but the pair of valley-side oblique ropes 33, 33 are formed on the support mountain 20 toward the slope mountain side. Restrain the tilt.
The pair of trough-side oblique ropes 33 and 33 reinforce the protective net 30, cooperate with the pair of mountain-side stay ropes 32 and 32, and the stay rope function that holds the column 20 in a more stable posture, and the net body 31. It has a deformation restraining function.

<4.3> Interval Holding Material The interval holding material 34 is a member made of rope or steel pipe installed between the heads of adjacent columns 20 and functions to hold the interval between the columns 20 constant.
In this example, the case where the spacing member 34 is made of rope will be described.

<4.4> Side Rope The side rope 35 is a rope that is stretched between the head of the support column 20 and the side anchor 13, and is attached to the interval holding member 34 that is laid horizontally between the heads of the support column 20. It works to give continuity.

<4.5> Rope Material The above-described mountain side stay rope 32, valley side oblique rope 33, spacing member 34, and side stay rope 35 are made of steel, fiber, resin, tensile strength, durability, and weather resistance. Made of material with excellent properties.

<6> Protective Net The protective net 30 includes a net body 31 and a plurality of sets of valley-side oblique ropes 33 that cover the net body 31.
The upper side of the protective net 30 hangs down from the heads of the plurality of support columns 20, and the lower end of the protective net 30 is turned toward the bottom of the slope.
A pocket 40 is formed between the protective net 30 and the inclined surface 10 so that the space gradually narrows toward the bottom of the protective net 30.

<6.1> Net Body The net body 31 is a known net made of a material excellent in tensile strength, durability, and weather resistance made of steel, fiber, or resin.

<6.2> Valley-side oblique rope The valley-side oblique rope 33 is a rope having a total length capable of obliquely longitudinally cutting the net 31, a reinforcing function of the net 31, a retaining rope function that supports the column 20 from the inclined valley side, And has a function of restraining deformation of the net 31.

[How to construct a protective fence]
Next, the construction method of the protective fence will be described.
<1> Standing up pillars A description will be given with reference to FIGS.

<2> Anchor Work A plurality of anchors 11 to 13 are provided at the predetermined positions on the slope 10 described above.
In this example, it is only necessary to provide a plurality of mountain-side anchors 11 and mountain-side anchors 11 at the upper and lower positions of the slope 10 in order to install a protective fence, and a large number of horizontal ropes crossing the protective net 30 and both ends of each horizontal rope are fixed. There is no need to provide a large number of anchors.

<3> Connection of stay ropes A pair of stay side ropes 32, 32 are connected in a V shape between the pair of left and right mountain side anchors 11, 11 and the heads of the respective struts 20, and between the heads of adjacent struts 20 between them. A spacing member 34 is connected, and a side holding rope 35 is connected between the head of the terminal column 20 and the side anchor 13 to hold the column 20 in an upright state.
The plurality of mountain side holding ropes 32 and the plurality of mountain side anchors 11 arranged in a continuous corrugated shape prevent the tilting of each column 20 toward the slope valley side.
If the base ends of two adjacent mountain-side retaining ropes 32, 32 are fixed to one mountain-side anchor 11 and the anchor is shared as in this example, the number of mountain-side anchors 11 can be halved.
In addition, you may fix the base end of each mountain side holding rope 32 to the individual mountain side anchor 11 without sharing the mountain side anchor 11.

<4> Installation of the protection net The protection net 30 is suspended between the heads of the columns 20 in the following manner.

<4.1> Suspension of mesh body The upper side of the mesh body 31 is suspended between the heads of the plurality of support columns 20, and the lower half of the mesh body 31 is moved to the inclined valley side of the support column 20.
Specifically, the upper side of the mesh body 31 is hung on a spacing member 34 that is horizontally mounted between the heads of the support columns 20, or the upper side of the mesh body 31 is mounted horizontally between the heads of the support columns 20 and is separately illustrated. Hanging on the rope.
The lower side of the net 31 is fixed to the inclined surface 10 or is not fixed and is left free.

<4.2> Installation of trough-side oblique ropes Finally, a pair of trough-side oblique ropes 33, 33 are connected in an inverted V shape between the head of each column 20 and a pair of left and right trough-side anchors 12, 12. Thus, the assembly of the protective net 30 is completed.
In order to enhance the deformation restraining effect of the net 31, the plurality of valley-side oblique ropes 33 are arranged so as to cover the net 31 from above.

In the conventional protective net, a net made of rope in which a plurality of vertical and horizontal ropes are assembled in a lattice form is attached to the net body and restrained by each horizontal rope.
On the other hand, in the present invention, the rope for restraining the net body 31 is only a plurality of valley-side oblique ropes 33 obtained by obliquely cutting the net body 31 in order to restrain the net body 31 compared to the conventional case. The rope length to be used can be greatly reduced.
Furthermore, the anchors necessary for restraining the protective net 30 are only the plurality of valley anchors 12 provided on the slope valley side of the support column 20, and it is not necessary to provide a large number of side anchors.
Furthermore, if the base ends of two adjacent valley-side inclined ropes 33, 33 are fixed to one valley-side anchor 12 and the anchor is shared, the number of valley-side anchors 12 installed can be halved.
Note that the base end of each valley-side inclined rope 33 may be individually fixed to the dedicated valley-side anchor 12 without sharing the valley-side anchor 12.

<5> Supporting means for the posture of the support column With reference to FIGS. 5 and 6, in this example, the supporting force directed to the slope mountain side through the pair of mountain side holding ropes 32, 32 exhibiting at least a V shape with respect to the support column 20. F ₁ and F ₁ act, and support forces F ₂ and F ₂ directed toward the slope trough side act through a pair of trough-side oblique ropes 33 and 33 having an inverted V shape.
Since these supporting forces F ₁ , F ₁ and supporting forces F ₂ , F ₂ are antagonistic to each other and are in a reverse relationship where the directions of the forces are opposite to each other, the supporting forces F ₁ , F ₂ direction (oblique direction) ) As well as tilting the column 20 in the vertical and horizontal directions can be effectively prevented.
Reason can be prevented tilting strut 20 toward the longitudinal direction is due to the resultant force F _U resultant force F _D of the supporting force F _2, F ₂ of the supporting force F _1, F ₁ is generated in the opposite directions.
Reason can be prevented tilting strut 20 toward the lateral direction, the right half of the supporting force F _1, the resultant force of the resultant force of F ₂ F _R and the supporting force F ₁ of the left half, F ₂ F _L is generated in the opposite directions to each other It is to do.

Further, horizontal supporting forces F ₃ and F ₃ act laterally through the spacing members 34 and 34 connected to the heads of the columns 20.
These horizontal support forces F ₃ and F ₃ are antagonistic to each other, and the direction of the force is in the opposite direction, so that the column 20 can be prevented from tilting in the lateral direction.

As described above, a plurality of supporting forces F ₁ , F ₁ , F ₂ , F ₂ and a horizontal support are provided in a direction opposite to the head of the support column 20 through at least the plurality of mountain side holding ropes 32 and the plurality of mountain side holding ropes 33. By applying the forces F ₃ and F ₃ , the head of the support column 20 can be held at a fixed position, so that the stable posture of each support column 20 can be maintained.

[Operation of protective fence]
Next, each function of the protective fence will be described.

<1> Capturing of fallen objects by a protective net When a fallen object enters the interior of the pocket 40 through the open space at the top of the protective net 30 of the protective fence, the protective net 30 reinforced by a plurality of valley-side oblique ropes 33 The protective net 30 guides the fallen object to the bottom of the slope 10 while preventing the fallen object from jumping out due to its strength.
When the collapsed object passes through the pocket 40, the fall energy of the collapsed object is attenuated by the frictional resistance between the slope 10 and the protective net 30.
Eventually, the fallen objects are captured and accumulated between the slope 10 and the protective net 30.

<2> Deformation restraint action by valley-side oblique ropes As described above, both ends of all valley-side oblique ropes 33 that obliquely cut the mesh body 31 are fixed to the heads of the columns 20 and the valley-side anchors 12, The valley-side oblique rope 33 has a deformation restraining action on the net 31.
Therefore, when the collapsed object passes through the inside of the pocket 40, a plurality of sets of valley side oblique ropes 33, 33 covering the net body 31 obtain reaction force from the support column 20 and the valley side anchor 12 to resist deformation of the net body 31. Therefore, the deformation of the protective net 30 can be effectively restrained.

<3> Supporting action of the support column at the time of impact The support force F ₁ , F ₁ , F ₂ , F ₂ and the horizontal support force F ₃ , F ₃ are applied to the head of the support column 20 in the opposite direction. The stable posture of each column 20 is maintained.
Accordingly, when the collapsing object passes through the inside of the pocket 40, even if the impact load of the collapsing object acts on each column 20 through the protective net 30, a plurality of impact loads of the collapsing item are connected to the heads of the columns 20. Since the ropes 32 to 35 and the plurality of anchors 11 to 13 can be supported in a distributed manner, the support column 20 can be prevented from being tilted and the support column 20 can be kept upright.
In particular, the V-shaped mountain-side holding ropes 32 and 32 and the inverted V-shaped valley-side oblique ropes 33 and 33 cooperate to exert the tilt-inhibiting effect in all directions of the column 20 and the impact acting on the column 20. Since the load can be dispersed, the load burden on the ropes 32 and 33 is reduced.
Therefore, the stable posture of each support column 20 can be maintained even at the time of impact, and the protective net 30 can be suspended in a stable posture.

[Other forms of protective fence]
Hereinafter, other embodiments of the protective fence will be described with reference to FIGS. 7 and 8. In the description, the same parts as those of the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. .

<1> Form in which only mountain side stay ropes are single In the previous embodiment, a pair of mountain side stay ropes 32 and 32 and a pair of valley side oblique ropes 33 and 33 are arranged in an X shape, and the column 20 is formed at the intersection. The form to support was demonstrated.

FIG. 7 shows a mode in which the mountain side holding rope 32 and the valley side oblique rope 33 are arranged in an inverted Y shape and the column 20 is supported at the intersection.
That is, in this example, the slope mountain side of the support column 20 is supported by one mountain anchor 11 provided right above the support column 20 and one mountain side holding rope 32, and the slope valley side of the support column 20 is paired with a pair of valley side anchors 12. , 12 and a pair of valley side inclined ropes 33, 3.
Also in this example, the single mountain side holding rope 32 and the inverted V-shaped valley side oblique ropes 33, 33 can cooperate to exert the tilt-inhibiting effect in all directions of the support column 20.
The operational effects of the inverted V-shaped valley-side oblique ropes 33, 33 and the pair of valley-side anchors 12, 12 are the same as those of the above-described embodiment, and thus description thereof is omitted.

<2> Form in which only the valley-side oblique rope is single FIG. 8 shows an aspect in which the mountain-side stay rope 32 and the valley-side oblique rope 33 are arranged in a Y shape and the support column 20 is supported at the intersection.
That is, in this example, the slope mountain side of the support column 20 is supported by a pair of mountain side anchors 11 and 11 and a pair of mountain side holding ropes 32 and 32, and the slope valley side of the support column 20 is supported by one valley side anchor 12 and one valley. It is supported by a side oblique rope.
Also in this example, the single mountain side holding rope 32 and the inverted V-shaped valley side oblique ropes 33, 33 can cooperate to exert the tilt-inhibiting effect in all directions of the support column 20.

10 .. slope 10 .. post 11 .. mountain side anchor 12 .. valley side anchor 13 .. side anchor 20. ... Hinge mechanism 30 ... Protective net 31 ... Net body 32 ... Mountain-side hook rope 33 ... Valley-side oblique rope 34 ... Spacing retainer 35・ ・ ・ ・ ・ Side side rope

Claims (7)

Provided with a plurality of struts erected on the slope at intervals and a protective net hanging between the heads of the plurality of struts, with protection between the protective net and the slope arranged with the lower end facing the bottom of the slope It is a protective fence that forms a pocket where the space gradually narrows toward the bottom of the net,
A plurality of mountain side holding ropes are stretched between the mountain side slope of each column and the column head,
A plurality of sets of trough-side slanted ropes are stretched to form a pair of trough-side slanted ropes so as to exhibit an inverted V shape between the trough-side slopes of each strut and the strut heads,
A belt-like net body in which the protective net hangs between the heads of a plurality of columns;
Is said net assembly separately from, while covering the upper surface of the network element, placed along a direction vertical to the diagonal net-body, net-body the plurality of sets that can restrain the deformation of the valley side swash rope And consisting of
At least the plurality of mountain side holding ropes and the plurality of valley slant ropes are stretched and connected to the column heads so that a plurality of supporting forces act in a direction opposite to the column heads. A protective fence characterized by holding the column in place.   The protective fence according to claim 1, wherein a plurality of mountain side hook ropes are stretched to form a pair of mountain side hook ropes so as to form a V shape between the mountain slope of the pole and the head of the pole. .   The protective fence according to claim 2, wherein a plurality of mountain-side anchors are provided at intervals on a mountain-side slope of the column, and base ends of the plurality of mountain-side holding ropes are fixed by sharing the mountain-side anchors.   The plurality of valley-side anchors are provided at intervals on the valley-side slope of the support column, and the base ends of the plurality of valley-side oblique ropes are fixed by sharing the valley-side anchors. Guard fence.   The protective fence according to claim 1, wherein a hinge mechanism is provided at a base portion of the support column.   The protective fence according to claim 1, wherein a spacing member is horizontally placed between the heads of adjacent struts.   The protective fence according to claim 6, wherein a side retaining rope is stretched between the head of the column at the end and a side slope to provide continuity to the spacing member.

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