JP6934768B2 - Guard rail - Google Patents

Description

The present invention relates to a guard fence that captures falling objects such as falling rocks and earth and sand from a slope, and more particularly to a structure that cushions an impact when capturing falling objects.

Conventionally, a guard fence has been known in which ropes and nets are stretched between columns fixed to terrain such as slopes to catch falling objects such as rockfalls and earth and sand falling from slopes and the like. In the guard fence disclosed in Patent Document 1, a cross rope is laid between adjacent columns. The cross ropes are continuously laid between the upper parts and the lower parts of adjacent columns, and at intersecting vertical angles. In addition, 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 guard fence transmits the impact from the net to the cross rope and from the cross rope to the support column. The guard 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 material, and the impact is absorbed by the sliding resistance of the shock absorber.

Japanese Unexamined Patent Publication No. 2015-81413

However, the guard fence disclosed in Patent Document 1 absorbs the impact due to the strength of the cross rope and the sliding resistance of the shock absorber when the impact of the cross rope is applied. When the rope is hung, the cross rope stretches or the cushioning tool and the rope material slide, and each element constituting the guard fence is deformed from the initial state of installation. Then, due to a relatively small rockfall, etc., each element of the guard fence is deformed and the strength at the beginning of installation cannot be secured, and in order to satisfy the design strength, the cross rope or shock absorber must be replaced and repaired. There was a problem.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a protective fence capable of maintaining the strength at the time of installation even when an impact such as a relatively small-scale falling rock is applied.

The protective 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 column. The upper chord material, the lower chord material passed between the lower portions of the adjacent columns, and the vertical ropes fixed to the plurality of horizontal ropes are provided, and the horizontal rope is provided between the adjacent columns. the rather long than the distance, it is suspended in a slack state the central portion between the struts, the longitudinal rope, so that the distance of the plurality of the horizontal rope is not separated, fixed to the center portion of the plurality of the horizontal rope Will be done .

According to the present invention, since the horizontal rope is longer than the distance between the columns, even if a relatively small impact such as a rock fall is applied, the impact received by the extra length of the horizontal rope can be alleviated. Therefore, even if the guard fence is impacted a plurality of times within a predetermined range, the guard fence can maintain the strength and impact absorption capacity at the time of installation.

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

Embodiment 1.
FIG. 1 is a front view showing a guard fence 100 according to a first embodiment of the present invention. The guard fence 100 is installed at the lower part of the terrain such as a slope to prevent rockfall and earth and sand from the slope and the like from flowing out below the guard fence 100. Therefore, for example, since a rockfall collides with the guard fence 100 from above the slope at a high speed, the guard fence 100 needs to cushion the impact of the rockfall and hold the rockfall below the guard fence 100 so that the rockfall does not flow out. be.

As shown in FIG. 1, the guard fence 100 includes a plurality of columns 30 whose lower ends are embedded and erected in the ground. For the support column 30, for example, a steel material, concrete, or a steel pipe filled with concrete is used. Then, the upper chord member 40 is passed between the upper portions of the adjacent columns 30. Further, the lower chord member 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 the same rigidity and strength as the support column 30.

A horizontal rope 10 is passed between the upper chord member 40 and the lower chord member 50 between the adjacent columns 30. In the first embodiment, two horizontal ropes 10 are installed between the upper chord member 40 and the lower chord member 50, but only one may be installed, or a larger number may be installed. ..

A vertical rope 20 is stretched in the vertical direction of the guard fence 100. The upper end of the vertical rope 20 is fixed to the upper chord member 40, and the lower end is fixed to the lower chord member 50. Further, at the portion where the vertical rope 20 and the horizontal rope 10 intersect, the vertical rope 20 and the horizontal rope 10 are fixed to each other. The vertical rope 20 and the horizontal rope 10 are fixed by, for example, a wire clip 90. As the horizontal rope 10 and the vertical rope 20, a wire rope or the like having excellent strength and weather resistance is used.

The lower end of the vertical rope 20 is not only fixed to the lower chord member 50, but also has a first cushioning member 80 driven into the ground. When tension is applied to the vertical rope 20, the tension is transmitted not only to the lower chord member 50 but also to the first cushioning member 80. In the first embodiment, the first cushioning material 80 has elasticity and elastically deforms 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 on the lower chord member 50 side and the lower chord member 50 among the plurality of horizontal ropes 10. In the first embodiment, the second cushioning material 70 absorbs energy by, for example, a frictional force. The second cushioning material 70 is obtained by sandwiching and fixing two rope materials having an extra length with metal fittings. The second cushioning material 70 absorbs the energy of the tension applied to the vertical rope 20 due to the sliding resistance between the metal fitting and the rope material.

FIG. 2 is a vertical cross-sectional view of the guard fence 100 of FIG. FIG. 2 shows a cross section taken along the line AA of FIG. The guard fence 100 has a guard net 60 installed on the mountain side of the horizontal rope 10 and the vertical rope 20. The protective net 60 is formed in a mesh shape to prevent relatively small rockfalls and earth and sand from flowing out below the protective fence 100. Therefore, the protective net 60 is installed so as to cover the support column 30, the upper chord member 40, and the space surrounded by the ground of the protective fence 100. The protective net 60 is appropriately fixed to the support column 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.

(Impact absorption method)
As shown in FIG. 1, the length l of the horizontal rope 10 is longer than the distance L between the adjacent columns 30. Therefore, the central portion of the horizontal rope 10 is below the fixing portion 31 with the columns 30 at both ends. The vertical rope 20 is fixed to the horizontal rope 10 with a wire clip 90 so that the distance between the horizontal ropes 10 in the state of FIG. 1 is not separated.

FIG. 3 is a view of the guard fence 100 of FIG. 2 in a state where an impact is applied from the mountain side. Rockfall or the like collides with the guard fence 100 from the mountain side. Therefore, a rock fall or the like collides 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 guard fence 100 receives a force from the mountain side, and the protective net 60, the horizontal rope 10, and the vertical rope 20 are deformed so as to project toward the valley side. At this time, since the horizontal rope 10 has slack as shown in FIG. 1, the central portion of the horizontal rope 10 is displaced along the arc centered on the fixed portion 31 as shown in FIG. At this time, since the central portion of the horizontal rope 10 is displaced upward from the beginning, the potential energy of falling rocks and the like colliding with the guard fence 100 increases. Since the velocity energy of the colliding rock fall is converted into potential energy, the converted velocity energy is absorbed. Therefore, the speed of the collision rock fall and the like is alleviated, and as a result, the impact applied to the protective net 60, the horizontal rope 10, and the vertical rope 20 is alleviated.

The lower end of the vertical rope 20 is fixed to the lower chord member 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 rock fall or the like collides with the guard fence 100, it can be deformed so as to be convex toward the valley side. If the rock fall that collides with the guard fence 100 is within the elastic range of the first cushioning material 80, the vertical rope 20 can absorb the impact without being deformed within that range. Therefore, the guard fence 100 has the initial strength and impact against falling rocks within a predetermined range due to the impact absorption due to the displacement of the horizontal rope 10 and the first cushioning material 80 provided on the vertical rope 20. Absorption capacity can be maintained. That is, since the performance of the guard fence 100 does not deteriorate with respect to relatively small rockfalls within a predetermined range, there is an advantage that the frequency of maintenance such as repair and parts replacement can be reduced.

As described above, the horizontal rope 10 and the vertical rope 20 of the guard fence 100 are displaced so as to project toward the valley side. Therefore, the protective net 60 is also displaced so as to be convex toward the valley side. As shown in FIG. 2, the protective net 60 is provided with an extra length portion 61 at an end portion on the ground side. Therefore, even when the protective net 60 is displaced so as to project toward the valley side, the extra length portion 61 is configured so that there is no gap in the lower portion of the protective fence 100. The extra length portion 61 is set to be longer than at least the distance P between the virtual 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 maximally displaced toward the valley side, the space surrounded by the support fence 100, the upper chord member 40, and the ground can be closed, and the guard fence 100 can be closed. Rockfall, earth and sand, etc. that collided with the river will not flow out to the valley side.

(Effect of Embodiment 1)
(1) The guard fence 100 according to the first embodiment is adjacent to a support column 30 erected at a predetermined distance L and a horizontal rope 10 fixed to each of the support columns 30 having both ends adjacent to each other. The upper chord member 40 passed between the upper portions of the support columns 30 and the lower chord member 50 passed between the lower portions of the adjacent columns 30 are provided. The horizontal rope 10 is longer than the distance L between the adjacent columns 30.
With this configuration, the guard fence 100 can receive the impact such as falling rocks while mitigating the impact due to the slack of the horizontal rope 10 suspended from the support column 30. If the impact received is within a predetermined range, the performance of the guard fence 100 does not change even after receiving the rock fall, so that it is not necessary to repair or replace each time there is a relatively small rock fall.

(2) The guard fence 100 according to the first embodiment further includes a vertical rope 20 fixed to a plurality of horizontal ropes 10.
With this configuration, the guard fence 100 can disperse the load received by the horizontal rope 10 from falling rocks and the like, so that the impact resistance performance is improved.

(3) In the guard fence 100 according to the first embodiment, 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.
With this configuration, the guard fence 100 can disperse and transmit the load received from falling rocks or the like to the high-strength columns 30 and the upper chord member 40, so that the load received by the horizontal rope 10 and the vertical rope 20 can be received. To increase. As a result, the impact resistance performance of the guard fence 100 is improved.

(4) According to the guard fence 100 according to the first embodiment, the vertical rope 20 is fixed so that the distance between the plurality of horizontal ropes 10 suspended by its own weight is not separated.
With this configuration, when a rock fall or the like collides with the guard fence 100, the plurality of horizontal ropes 10 are interlocked and displaced, so that the speed of the rock fall or the like can be reliably reduced.

(5) According to the guard fence 100 according to the first embodiment, the vertical rope 20 is attached with cushioning materials 70 and 80 that absorb energy when tension is applied to the vertical rope 20.
(6) According to the guard 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 guard 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.
With this configuration, the guard fence 100 can absorb the impact due to the displacement of the horizontal rope 10 and also reduce the energy of collision such as falling rocks by the cushioning materials 70 and 80 attached to the vertical rope 20. .. Therefore, the impact resistance performance of the guard fence 100 is improved.

(8) According to the guard fence 100 according to the first embodiment, the cushioning material 70 absorbs energy by friction.
(9) According to the guard fence 100 according to the first embodiment, the cushioning material 80 absorbs energy by elastic force.
(10) According to the protective fence 100 according to the first embodiment, the cushioning material is a vertical rope of a first cushioning material 80 that absorbs energy by elastic force and a second cushioning material 70 that absorbs energy by friction. It is configured by attaching a plurality of pieces in series to 20.
With this configuration, the guard fence 100 can respond to impacts according to the scale of falling rocks and the like. For example, the cushioning material 80 can be restored to its original state while absorbing energy by elastic force for relatively small-scale rockfalls, etc., so even if relatively small-scale rockfalls, etc. are received multiple times. The performance of the guard fence 100 does not deteriorate. Further, for a relatively large-scale falling rock or the like, the performance of the guard fence 100 can be improved by absorbing energy by frictional force. Further, since the vertical rope 20 can follow the displacement of the horizontal rope 10 by the cushioning material due to the elastic force, the structure is suitable for the impact absorption by the horizontal rope 10 described in (1) above.

(11) According to the guard fence 100 according to the first embodiment, the guard net 60 provided on the mountain side of the horizontal rope 10 is further provided.
(12) According to the protection fence 100 according to the first embodiment, the length of the protection net 60 in the vertical direction is longer than the distance H from the ground on which the support column 30 is erected to the upper chord member 40.
(13) According to the guard fence 100 according to the first embodiment, the difference between the vertical length of the protective net 60 and the distance H is the virtual 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 in the state where 10 is suspended between the columns 30.
With this configuration, the guard fence 100 can prevent fine objects such as earth and sand from flowing out to the valley side even if they collide with the guard fence 100. Further, since the protective net 60 has an extra length portion 61 at the lower end portion, when earth and sand, falling rocks, etc. collide with the protective fence 100, and the protective net 60, the horizontal rope 10, and the vertical rope 20 are projected toward the valley side. Even if there is, there is no gap at the bottom of the guard fence 100. Therefore, as described in (1) above, the structure is such that the impact is absorbed by the displacement of the horizontal rope 10 and the earth and sand do not flow out to the valley side.

10 horizontal rope, 20 vertical rope, 30 columns, 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 (12)

With the columns erected at a predetermined distance,
Horizontal ropes fixed to each of the columns adjacent to each other at both ends,
The upper chord material passed between the upper parts of the adjacent columns,
The lower chord material passed between the lower parts of the adjacent columns and
With a vertical rope fixed to the plurality of horizontal ropes ,
The horizontal rope
Tonaria' was rather long than the distance between the strut, the central part is suspended in a slack state between the struts,
The vertical rope
A guard fence fixed to the central portion of the plurality of horizontal ropes so that the plurality of the horizontal ropes are not separated from each other. The vertical rope
The upper end is fixed to the upper chord material,
The protective fence according to claim 1 , wherein the lower end is fixed to the lower chord member. The vertical rope
The guard fence according to claim 1 or 2 , wherein a cushioning material that absorbs energy when tension is applied to the vertical rope is attached. The cushioning material is
The guard fence according to claim 3 , which is attached to the vertical rope between the horizontal rope and the upper chord member. The cushioning material is
The guard fence according to claim 3 or 4 , which is attached to the vertical rope between the horizontal rope and the lower chord member. The cushioning material is
The protective fence according to any one of claims 3 to 5 , which absorbs energy by friction. The cushioning material is
The protective fence according to any one of claims 3 to 5 , which absorbs energy by elastic force. The cushioning material is
According to any one of claims 3 to 5, a first cushioning material that absorbs energy by elastic force and a second cushioning material that absorbs energy by friction are attached in series to the vertical rope. Described guard fence. The protective fence according to any one of claims 1 to 8 , further comprising a protective net provided on the mountain side of the horizontal rope. The protective net is
The guard fence according to claim 9 , wherein the length in the vertical direction is longer than the distance H from the ground on which the support is erected to the upper chord member. The difference between the vertical length of the protective net and the distance H is
The guard fence according to claim 10 , wherein the distance P between the virtual line connecting the fixing portions at both ends of the horizontal rope and the lowest point in a state where the horizontal rope is suspended between the columns is longer than the distance P. With the columns erected at a predetermined distance,
A horizontal rope fixed to each of the columns adjacent to each other at both ends,
The upper chord material passed between the upper parts of the adjacent columns,
The lower chord material passed between the lower parts of the adjacent columns and
A protective net provided on the mountain side of the horizontal rope is provided.
The horizontal rope
Tonaria' was rather long than the distance between the posts,
The vertical length of the protective net is
Longer than the distance H from the ground on which the support is erected to the upper chord member,
The difference between the vertical length of the protective net and the distance H is
A guard fence longer than the distance P between the virtual line connecting the fixing portions at both ends of the horizontal rope and the lowest point in the state where the horizontal rope is suspended between the columns.

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