JP6860908B2 - Rockfall protection fence - Google Patents

Description

According to the present invention, by providing an extension portion in the rockfall protection fence, in particular, the wire mesh, it is possible to suppress the spread and tear of the wire mesh due to the first rockfall, and as a result, it is possible to reliably cope with the subsequent rockfall. It is about the rockfall protection fence that can be made.

It is common practice to install rockfall protection fences on slopes to prevent rockfalls on roads and the like.

An example of a rockfall protection fence will be described with reference to the drawings. Hereinafter, this rockfall protection fence will be referred to as a conventional rockfall protection fence.

FIG. 4 is a schematic perspective view showing a conventional rockfall protection fence.

In FIG. 4, 11 is a support column constructed on the slope 12 at a predetermined interval, 13 is a mountain side wire stretched between the upper end of the support column 11 and the slope 12 on the mountain side (M), and 14 is a support column. The valley-side wire 15 stretched between the upper end of 11 and the slope 12 on the valley-side (V) is a wire mesh stretched between the columns 11 to catch rockfall.

According to the conventional rockfall protection fence described above, the rockfall can be prevented from falling on the road or the like as a result of being received by the wire mesh 15. At this time, since the support column 11 is pulled by the mountain side wire 13, there is no possibility that the support column 11 will fall to the valley side (V).

Further, when a rock fall from the slope 11 collides with the wire mesh 15, a tensile force acts on the mountain side wire 13, and the reaction causes the support column 11 to fall down to the mountain side (M). Since it is pulled by the valley side wire 14, there is no possibility that the support column 11 will fall down to the mountain side (M).

However, according to the conventional rockfall protection fence, the wire mesh 15 stretched between the columns 11 does not have a stretch margin. Therefore, if the degree of the first rockfall is large, the mesh of the wire mesh 15 is greatly widened or the wire mesh 15 is torn. There were times when.

As described above, if the mesh of the wire mesh 15 is greatly widened by the first rockfall or the wire mesh 15 is torn, there is a problem that it is not possible to cope with the subsequent rockfall.

Therefore, it is an object of the present invention that by providing a stretch margin in the wire mesh stretched between the columns, it is possible to suppress the spread and tear of the wire mesh due to the first rockfall, and as a result, the subsequent rockfall can be reliably dealt with. The purpose is to provide a rockfall protection fence that can be used.

The present invention has been made to achieve the above object, and is characterized by the following.

The invention according to claim 1 is a rockfall protection fence constructed on a slope to prevent rockfall, comprising a support column installed on the slope and a wire mesh stretched between the support columns. at least one end portion of the wire mesh is formed by pulling on the strut side, the have an elongation margin portion which is temporarily fixed through the tacking member to the post, the wire mesh, falling rocks collides with the wire mesh At that time, the temporary fixing member is broken and stretches by the length of the stretch margin portion.

The invention according to claim 2 is the invention according to claim 1 , wherein the extension allowance portion is formed by pulling a folding steel bar inserted into an end portion of the wire mesh toward the support column side together with the wire mesh. The folding steel bar is characterized in that it is temporarily fixed to the support column via the temporary fixing member.

The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2 , the temporary fixing member is composed of a binding band.

According to the present invention, by providing the extension portion in the wire mesh, it is possible to suppress the spread and tear of the mesh of the wire mesh due to the first rock fall, and as a result, it is possible to surely cope with the subsequent rock fall.

It is a partial perspective view which shows the state before the rockfall collided with the wire net in the rockfall protection fence of this invention. It is a partial perspective view which shows the state after a rockfall hits a wire net in the rockfall protection fence of this invention. It is a front view which shows the other mounting mode of a wire mesh and a wire. It is a schematic perspective view which shows the conventional rockfall protection fence.

An embodiment of the rockfall protection fence of the present invention will be described with reference to the drawings.

FIG. 1 is a partial perspective view showing a state before the rockfall collides with the wire net in the rockfall protection fence of the present invention, and FIG. 2 shows a state after the rockfall hits the wire mesh in the rockfall protection fence of the present invention. It is a partial perspective view.

In FIGS. 1 and 2, 1 is a strut made of H-shaped steel on a slope on which a flange 1a and a web 1b are formed, and 2 is a diamond-shaped wire mesh stretched between the strut 1. The wire mesh is not limited to the diamond-shaped wire mesh. Fixing steel bars 3 are inserted through both ends of the wire mesh 2 (only one end is shown), and the fixing steel bars 3 are fixed to one flange 1a of the support column 1 by U bolts and nuts 4. A wire 5 is inserted through the upper and lower ends of the wire mesh 2 (only the upper end is shown), and the wire mesh 2 and the wire 5 are connected by a coil 10. Both ends of the wire 5 are fixed to the web 1b of the support column 1 via the eyebolts 6. As shown in FIG. 3, the wire mesh 2 may be attached to the wire 5 by inserting only the wire 5 through the wire mesh 2 without using the coil 10.

Reference numeral 7 denotes a folding steel bar, which is inserted into the end portion of the wire mesh 2. The upper and lower ends of the folding steel bar 7 are bent in a U shape and are engaged with the wire 5. The folding steel bar 7 may be directly engaged with the wire mesh 2 without being engaged with the wire 5.

Reference numeral 8 is an extension allowance portion. As shown in FIG. 1, the extension allowance portion 8 is formed by pulling the folding steel bar 7 together with the wire mesh 2 toward the support column 1 and folding the end portion of the wire mesh 2. The folding direction of the wire mesh 2 is indicated by an arrow in FIG. The extension margin 8 is formed at either end of the wire mesh 2 or at both ends of the wire mesh 2.

Reference numeral 9 denotes a temporary fixing member made of a binding band or the like, and the folding steel bar 7 is temporarily fixed to the support column 1 via the fixing steel bar 3.

According to the present invention configured as described above, as a result of being able to suppress the spread and tear of the wire mesh 2 due to the first rock fall, the subsequent rock fall is surely dealt with. be able to.

When constructing the rockfall protection fence, as shown in FIG. 1, the folding steel bar 7 is pulled toward the support column 1 side together with the wire mesh 2, and the end portion of the wire mesh 2 is folded to extend the extension margin to at least one end of the wire mesh 2. Part 8 is formed. The folding bar steel 7 and the fixing steel bar 3 are bound by a temporary fixing member 9 such as a binding band so that the stretch margin portion 8 does not spread, and the folding bar steel 7 is temporarily attached to the support column 1 via the fixing steel bar 3. Stop.

As described above, when rockfall occurs in a state where the extension margin 8 is formed at at least one end of the wire mesh 2, and the rockfall collides with the wire mesh 2, the wire mesh 2 is pulled by the impact force, and as a result, the wire mesh 2 is temporarily fixed. The member 9 is broken, and the wire mesh 2 is stretched by the length of the stretch margin portion 8.

As a result of the impact force of the falling rock being absorbed by the extension of the wire mesh 2, it is suppressed that the mesh of the wire mesh 2 is greatly widened or the wire mesh 2 is torn by the first rock falling, thereby subsequently. You can surely catch the falling rocks that occur.

As described above, according to the present invention, by providing the extension margin 8 in the wire mesh 2 stretched between the columns 1, it is possible to suppress the spread and tear of the wire mesh 2 due to the first rock fall. , It is possible to surely respond to the subsequent rockfall.

1: Support 1a: Flange 1b: Web 2: Wire mesh 3: Fixing steel bar 4: U bolt / nut 5: Wire 6: Eye bolt 7: Folding steel bar 8: Stretching allowance 9: Temporary fixing member 10: Coil 11: Support 12: Slope 13: Mountain side wire 14: Mountain side wire 15: Wire mesh

Claims (3)

In the rockfall protection fence built on the slope to prevent rockfall
The pillars installed on the slope and
It is equipped with a wire mesh stretched between the columns.
The wire mesh is formed by pulling at least one end of the wire mesh toward the support column, and has an extension allowance portion that is temporarily fixed to the support column via a temporary fixing member.
The wire mesh is a rockfall protection fence characterized in that when a rockfall collides with the wire mesh, the temporary fixing member breaks and extends by the length of the extension allowance portion. The extension allowance portion is formed by pulling the folding bar steel inserted into the end of the wire mesh toward the support column side together with the wire mesh, and the folding bar steel is temporarily fixed to the support column via the temporary fixing member. It is characterized in that is, falling rock protective fence according to claim 1. The rock fall protection fence according to claim 1 or 2 , wherein the temporary fixing member is composed of a binding band.

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