JP2019027024A - Guard fence - Google Patents

Abstract

To provide a guard fence capable of maintaining strength of the originally installed guard fence even when impact such as a relatively small-scale fall of rock or the like is applied.SOLUTION: A guard fence according to the present invention comprises columns stood at a predetermined distance, a horizontal rope having both ends fixed to adjacent columns, an upper chord material built over an upper part of the adjacent columns, and a lower chord material built over a lower part of the adjacent columns. The horizontal rope is longer than a distance between the adjacent columns.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a protective fence that captures falling objects from slopes such as falling rocks and earth and sand, and more particularly, to a structure that mitigates impact when capturing falling objects.

  2. Description of the Related Art Conventionally, protective fences are known in which ropes and nets are stretched between support posts fixed on a terrain such as a slope, and falling objects such as falling rocks and earth and sand falling from the slope are captured. In the guard fence currently disclosed by patent document 1, the cross rope is bridged between adjacent support | pillars. The cross rope is continuously stretched between the upper and lower portions of adjacent struts and in an obliquely crossing direction. Also, shock absorbers are provided near both ends of the cross rope. When an impact such as falling rocks acts on a part of the net, the protective fence is transmitted from the net to the cross rope and from the cross rope to the support. The protective fence absorbs the impact with the strength of the net and cross rope. Further, when the impact exceeds the sliding resistance of the shock absorber, sliding occurs between the shock absorber and the rope member, and the shock is absorbed by the sliding resistance of the shock absorber.

JP2015-81413A

  However, the protective fence disclosed in Patent Document 1 absorbs the impact by the strength of the cross rope and the sliding resistance of the shock absorber when a cross rope impact is applied. When the crossing is applied, the cross rope is stretched or the shock absorber and the rope material slide, and the elements constituting the protective fence are deformed from the initial state of installation. Then, each element of the protective fence is deformed by a relatively small falling rock, etc., and the initial strength cannot be secured, and in order to satisfy the design strength, the cross rope or the buffer must be replaced and repaired. There was a problem.

  This invention solves said subject, and it aims at providing the protection fence which can maintain the intensity | strength at the time of installation even if the impact of comparatively small falling rocks etc. is added.

  The guard fence according to the present invention is passed between a support column erected at a predetermined distance, a horizontal rope fixed to each of the support columns adjacent to each other at both ends, and an upper portion of the adjacent support columns. An upper chord member and a lower chord member passed between the lower portions of the adjacent struts, wherein the lateral rope is longer than the distance between the adjacent struts.

  According to the present invention, since the horizontal rope is longer than the distance between the support columns, the impact received by the extra length of the horizontal rope can be mitigated even when a relatively small impact from a falling rock is applied. Therefore, even if an impact within a predetermined range is applied to the protective fence a plurality of times, the protective fence can maintain the original strength and shock absorption capability.

It is a front view which shows the guard fence 100 which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the protective fence 100 of FIG. It is a figure in the state where the impact was added from the mountain side in the protective fence 100 of FIG.

Embodiment 1 FIG.
FIG. 1 is a front view showing a protective fence 100 according to Embodiment 1 of the present invention. The protective fence 100 is installed at the lower part of the topography such as a slope, and prevents falling rocks and earth and sand from the slope and the like from flowing out below the protective fence 100. Therefore, for example, since the falling rock collides with the protective fence 100 at a speed from the top of the slope, the protective fence 100 needs to reduce the impact of the falling rock and keep the falling rock from flowing out below the protective fence 100. is there.

  As shown in FIG. 1, the protective fence 100 includes a plurality of support columns 30 that are erected with their lower ends buried in the ground. As the support column 30, for example, a steel material, concrete, or a steel pipe filled with concrete is used. The upper chord material 40 is passed between the upper portions of the adjacent columns 30. Further, the lower chord material 50 is passed along the ground between the lower portions of the adjacent columns 30. The upper chord member 40 is made of a material having rigidity and strength equivalent to those of the support column 30.

  Between the upper chord member 40 and the lower chord member 50, the horizontal rope 10 is passed between the adjacent struts 30. In the first embodiment, two horizontal ropes 10 are installed between the upper chord material 40 and the lower chord material 50, but only one or more may be installed. .

  A vertical rope 20 is stretched in the vertical direction of the protective fence 100. The vertical rope 20 has an upper end fixed to the upper chord member 40 and a lower end fixed to the lower chord member 50. Moreover, the vertical rope 20 and the horizontal rope 10 are mutually fixed in the part where the vertical rope 20 and the horizontal rope 10 cross | intersect. The vertical rope 20 and the horizontal rope 10 are fixed by a wire clip 90, for example. The horizontal rope 10 and the vertical rope 20 are wire ropes having excellent strength and weather resistance.

  The lower end portion of the vertical rope 20 is not only fixed to the lower chord material 50 but also attached with a first cushioning material 80 driven into the ground. When tension is applied to the vertical rope 20, the tension is transmitted not only to the lower chord material 50 but also to the first buffer material 80. In the first embodiment, the first buffer material 80 has elasticity, and is elastically deformed according to the tension of the vertical rope 20 to absorb the impact.

  In the vertical rope 20, a second cushioning material 70 is attached between the horizontal rope 10 installed closest to the lower chord material 50 and the lower chord material 50 among the plurality of horizontal ropes 10 installed. In the first embodiment, the second buffer material 70 absorbs energy by, for example, a frictional force. The second cushioning material 70 is obtained by fixing two rope materials having extra lengths with metal fittings. The second cushioning material 70 absorbs energy of tension applied to the vertical rope 20 due to sliding resistance between the metal fitting and the rope material.

  FIG. 2 is a longitudinal sectional view of the protective fence 100 of FIG. FIG. 2 shows an AA cross section of FIG. The protection fence 100 is provided with a protection net 60 on the mountain side of the horizontal rope 10 and the vertical rope 20. The protective net 60 is formed in a mesh shape, and prevents relatively small falling rocks or earth and sand from flowing out below the protective fence 100. Therefore, the protection net 60 is installed so as to cover the space surrounded by the support 30 of the protection fence 100, the upper chord material 40, and the ground. The protective net 60 is appropriately fixed to the support 30, the upper chord member 40, the horizontal rope 10, the vertical rope 20, and the lower chord member 50, and is configured to move together with the horizontal rope 10 and the vertical rope 20.

(Shock absorption method)
As shown in FIG. 1, the length l of the horizontal rope 10 is longer than the distance L between the adjacent struts 30. Therefore, the horizontal rope 10 has a central portion below the fixing portions 31 with the support columns 30 at both ends. The vertical rope 20 is fixed to the horizontal rope 10 with a wire clip 90 so that the interval between the horizontal ropes 10 in the state of FIG.

  FIG. 3 is a view showing a state where an impact is applied from the mountain side in the protective fence 100 of FIG. The protective fence 100 collides with falling rocks from the mountain side. Therefore, falling rocks collide with the protective net 60 and the impact is transmitted to the horizontal rope 10 and the vertical rope 20. As shown in FIG. 3, the protective fence 100 receives a force from the mountain side and deforms so that the protective net 60, the horizontal rope 10, and the vertical rope 20 protrude to the valley side. At this time, since the horizontal rope 10 has a slack as shown in FIG. 1, the central portion of the horizontal rope 10 is displaced along an arc centered on the fixed portion 31 as shown in FIG. 3. At this time, since the central portion of the horizontal rope 10 is displaced upward from the beginning, the potential energy of the falling rocks or the like colliding with the protective fence 100 increases. Since the velocity energy of the collided rock fall and the like is converted into potential energy, the converted velocity energy is absorbed. Therefore, the speed of the falling rocks and the like that collided is reduced, and as a result, the impact applied to the protective net 60, the horizontal rope 10, and the vertical rope 20 is reduced.

  The lower end of the vertical rope 20 is fixed to the lower chord material 50. In the first embodiment, the lower chord member 50 is a rope member passed between the columns 30 and can be bent. The vertical rope 20 is attached with a first cushioning material 80 that is further elastically deformed. Therefore, when a falling rock collides with the protective fence 100, it can deform | transform so that it may protrude in a trough side. If the falling rocks etc. which collided with the protective fence 100 are within the range of the elastic region of the first buffer material 80, the vertical rope 20 can absorb the impact without being deformed within the range. Accordingly, the protective fence 100 is designed to absorb the impact due to the displacement of the horizontal rope 10 and the first cushioning material 80 provided to the vertical rope 20 against falling rocks and the like within a predetermined range. Absorption capacity can be maintained. That is, since the performance of the protective fence 100 does not deteriorate with respect to a relatively small falling rock within a predetermined range, there is an advantage that the frequency of maintenance such as repair and replacement of parts can be reduced.

  As described above, the horizontal rope 10 and the vertical rope 20 of the protective fence 100 are displaced so as to protrude toward the valley side. Accordingly, the protective net 60 is similarly displaced so as to protrude toward the valley side. As shown in FIG. 2, the protective net 60 is provided with an extra length portion 61 at the end on the ground side. Therefore, even when the protective net 60 is displaced so as to protrude toward the valley side, the extra length portion 61 is configured such that there is no gap in the lower portion of the protective fence 100. The surplus length portion 61 is set to be longer than the distance P between at least an imaginary line connecting the fixed portions 31 at both ends of the horizontal rope 10 and the lowest point of the horizontal rope 10. Therefore, even when the horizontal rope 10 and the vertical rope 20 are displaced to the maximum at the valley side, the column 30 of the protective fence 100, the upper chord material 40, and the space surrounded by the ground can be closed. Rocks, earth and sand, etc. that collide with the lands do not flow to the valley side.

(Effect of Embodiment 1)
(1) The guard fence 100 according to the first embodiment is adjacent to the support 30 that is erected with a predetermined distance L, the horizontal rope 10 that is fixed to each of the support 30 that is adjacent to both ends. The upper chord material 40 passed between the upper portions of the support columns 30 and the lower chord material 50 passed between the lower portions of the adjacent support columns 30 are provided. The lateral rope 10 is longer than the distance L between the adjacent struts 30.
By being configured in this way, the protective fence 100 can be received while mitigating impacts such as falling rocks by the slack of the horizontal rope 10 suspended from the support column 30. If the received impact is within a predetermined range, the performance of the protective fence 100 does not change even after receiving a fallen rock, so there is no need to repair or replace every time there is a relatively small fallen rock.

(2) The protective fence 100 according to the first embodiment further includes a vertical rope 20 fixed to the plurality of horizontal ropes 10.
By being configured in this manner, the protective fence 100 can disperse the load that the horizontal rope 10 receives from falling rocks and the like, so that the impact resistance performance is improved.

(3) In the protective fence 100 according to the first embodiment, the vertical rope 20 has the upper end portion fixed to the upper chord member 40 and the lower end portion fixed to the lower chord member 50.
By being configured in this way, the guard fence 100 can disperse and transmit the load received from falling rocks etc. to the struts 30 and the upper chord material 40 having high strength, so that the load that the horizontal rope 10 and the vertical rope 20 can receive is reduced. To increase. As a result, the impact resistance performance of the protective fence 100 is improved.

(4) According to the protective fence 100 according to the first embodiment, the vertical rope 20 is fixed so that the intervals between the plurality of horizontal ropes 10 suspended by its own weight are not separated.
By being configured in this manner, when a falling rock collides with the protective fence 100, the plurality of horizontal ropes 10 are displaced in association with each other, so that the speed of the falling rock can be surely reduced.

(5) According to the protective fence 100 according to the first embodiment, the vertical rope 20 is attached with the buffer materials 70 and 80 that absorb energy when the vertical rope 20 is tensioned.
(6) According to the protective fence 100 according to the first embodiment, the cushioning materials 70 and 80 are attached to the vertical rope 20 between the horizontal rope 10 and the upper chord material 40.
(7) According to the protective fence 100 according to the first embodiment, the cushioning materials 70 and 80 are attached to the vertical rope 20 between the horizontal rope 10 and the lower chord material 50.
By being configured in this way, the protective fence 100 can relieve the energy of collision such as falling rocks by the cushioning materials 70 and 80 attached to the vertical rope 20 in addition to absorbing the impact due to the displacement of the horizontal rope 10. . Therefore, the impact resistance performance of the protective fence 100 is improved.

(8) According to the protective fence 100 according to Embodiment 1, the cushioning material 70 absorbs energy by friction.
(9) According to the protective fence 100 according to the first embodiment, the buffer material 80 absorbs energy by elastic force.
(10) According to the protective fence 100 according to the first embodiment, the buffer material is a vertical rope that includes the first buffer material 80 that absorbs energy by elastic force and the second buffer material 70 that absorbs energy by friction. 20 is configured to be mounted in series.
By being configured in this way, the protective fence 100 can cope with impacts according to the scale of falling rocks and the like. For example, since the shock absorbing material 80 can be restored to its original state while absorbing energy by elastic force for a relatively small scale rock, etc., even if a relatively small scale rock is received multiple times. The performance of the protective fence 100 does not deteriorate. Moreover, the performance of the protection fence 100 can be made high by absorbing energy with a friction force with respect to a rock fall etc. with a comparatively large scale. Moreover, since the vertical rope 20 can follow the displacement of the horizontal rope 10 by the cushioning material by the elastic force, the configuration becomes suitable for the impact absorption by the horizontal rope 10 described in the above (1).

(11) The protective fence 100 according to the first embodiment further includes the protective net 60 provided on the mountain side of the horizontal rope 10.
(12) According to the protective fence 100 according to the first embodiment, the protective net 60 has a length in the vertical direction longer than the distance H from the ground on which the support column 30 is erected to the upper chord material 40.
(13) According to the protective fence 100 according to the first embodiment, the difference between the length in the vertical direction of the protective net 60 and the distance H is the imaginary line connecting the fixed portions 31 at both ends of the horizontal rope 10 and the horizontal rope. It is longer than the distance P from the lowest point when 10 is suspended between the columns 30.
By being configured in this way, the protective fence 100 can prevent a fine thing such as earth and sand from flowing out to the valley side even if it collides with the protective fence 100. Moreover, since the protection net 60 has the extra length part 61 in the lower end part, when earth and sand, rock fall, etc. collide with the protection fence 100, the protection net 60, the horizontal rope 10, and the vertical rope 20 protrude in the valley side. Even if it exists, a clearance gap does not arise in the lower part of the protective fence 100. Therefore, as described in the above (1), the structure is structured such that the impact is absorbed by the displacement of the horizontal rope 10 and the earth and sand are not discharged to the valley side.

  10 horizontal rope, 20 vertical rope, 30 strut, 31 fixed part, 40 upper chord material, 50 lower chord material, 60 protective net, 61 extra length part, 70 (second) cushioning material, 80 (first) cushioning material, 90 wire Clip, 100 Guard fence, H distance, L distance, P distance.

Claims (13)

Struts erected at a predetermined distance;
A lateral rope fixed to each of the pillars adjacent to each other at both ends;
Upper chord material passed between the upper parts of the adjacent struts,
A lower chord material passed between the lower portions of the adjacent struts,
The horizontal rope is
A guard fence that is longer than the distance between adjacent struts.   The protective fence according to claim 1, further comprising a vertical rope fixed to the plurality of horizontal ropes. The vertical rope is
The upper end is fixed to the upper chord material,
The protective fence according to claim 2, wherein a lower end portion is fixed to the lower chord member. The vertical rope is
The protection fence of Claim 2 or 3 fixed to the said some horizontal rope so that the space | interval of the said some horizontal rope suspended in the dead weight may not leave | separate. The vertical rope is
The protective fence according to claim 4, wherein a buffer material that absorbs energy when tension is applied to the vertical rope is attached. The cushioning material is
The protective fence according to claim 5 attached to said vertical rope between said horizontal rope and said upper chord material. The cushioning material is
The protective fence according to claim 5 or 6, which is attached to the vertical rope between the horizontal rope and the lower chord material. The cushioning material is
The protective fence according to any one of claims 5 to 7, wherein energy is absorbed by friction. The cushioning material is
The protective fence according to any one of claims 5 to 7, wherein energy is absorbed by an elastic force. The cushioning material is
In any one of Claims 5-7 comprised by attaching the 1st shock absorbing material which absorbs energy with an elastic force, and the 2nd shock absorbing material which absorbs energy with friction to the said vertical rope in series. The protective fence described.   The protective fence according to any one of claims 1 to 10, further comprising a protective net provided on a mountain side of the horizontal rope. The protective net is
The protective fence according to claim 11, wherein a length in a vertical direction is longer than a distance H from the ground on which the support column is erected to the upper chord material. The difference between the vertical length of the protective net and the distance H is
The protective fence according to claim 12, which is longer than a distance P between a virtual line connecting fixed portions at both ends of the horizontal rope and a lowest point in a state where the horizontal rope is suspended between the columns.

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