JP3208783U - Protective fence - Google Patents

Abstract

[PROBLEMS] To provide a protective fence capable of significantly improving the shock absorption performance by a rhombus metal mesh while suppressing the displacement of the fence height with a simple structure. A guard fence in which a rhombus wire mesh 10 is horizontally placed between a plurality of support columns 30 and a mesh 13 defined by two row lines 11 and 11 has a vertically long rhombus, The opposing angle θ1 in the vertical direction of the mesh 13 is formed as an acute angle, and the opposing angle θ2 in the horizontal direction of the mesh 13 is formed as an obtuse angle. [Selection] Figure 1

Description

  The present invention relates to a protective fence for capturing a huge fallen object such as a falling rock, an avalanche, and a fallen earth and sand.

This type of protective fence has a protective net horizontally placed between support columns standing at intervals. In a protective fence with a small impact force, a rhombus wire mesh is used alone as a protection net, and when the impact force becomes medium or larger, a wire rope and a diamond wire mesh are combined (Patent Documents 1 and 2).
In general, the rhombus wire mesh is formed by intertwining a plurality of helical column lines, and the working angle of the bent portion of the column line is 85 ° as a standard in the JIS standard (JIS G3552).
With reference to FIG. 4, a conventional diamond wire mesh 20 for a protective fence will be described.
The rhombus wire mesh 20 is connected by winding a connecting coil 32 or the like around a horizontal rope 31 whose upper and lower sides are spanned between the heads and the bottoms of the support columns 30.
In a rhombus wire mesh for a protective fence, a mesh 23 surrounded by two column lines 21 arranged in a vertical direction is often formed in a square or a horizontally long rhombus.
If the network 23 exhibits a horizontally long, opposite angle theta ₁ in the vertical direction of the mesh 23 at an obtuse angle, facing angle theta ₂ in the lateral direction is formed at an acute angle.
In assembling the protective fence, the end portions 22 of the row line 21 subjected to knuckle processing, twist processing, and the like are positioned on the upper and lower sides of the wire net body, and the upper and lower sides of the rhombus metal net 20 are attached to the horizontal rope 31.
When a falling rock collides, the rhomboid wire mesh 20 is deformed toward the valley side, and the deformation resistance when the mesh 23 is deformed from horizontally long to vertically along with the plastic deformation of the row line 21 and in the thickness direction of the wire mesh. Impact energy is absorbed by the directed deformation resistance.

JP 2009-24378 A JP 2009-144472 A

The conventional protective fence includes the following problems to be solved.
<1> In the rhombus wire mesh 20 in which the mesh 23 has a horizontally long rhombus, since the opposing angle θ _{2 in} the left-right direction of the mesh 23 is an acute angle, the deformation amount of the rhombus metal mesh 20 in the lateral direction X is limited when received. Will be.
<2> The rhombus wire mesh 20 in which the mesh 23 has a horizontally long rhombus has a large amount of deformation in the vertical direction Y, but the rhomboid wire mesh 20 originally has a small amount of elongation deformation in the horizontal direction X. The shock absorption performance is not fully demonstrated.
<3> In the rhombus wire mesh 20 in which the mesh 23 has a square rhombus, a difference is hardly generated in the deformation amount in the vertical direction Y and the horizontal direction X at the time of impact.
<4> A guard fence is known in which the upper, lower, left and right sides of the rhombus wire mesh 20 are constrained.
When an impact is applied to the rhombus wire mesh 20, forces are equally applied to the four corners of the mesh 23, so that the mesh 23 only has a horizontally elongated rhombus deformed into a square, and the mesh 23 cannot be greatly deformed.
<5> In order to improve the shock absorbing performance of the diamond wire mesh 20, it is known that the thickness of the wire mesh body is increased or the row wires 21 are formed of a plurality of steel wires. And the capacity increases and the cost increases.

  The present invention has been made in view of the above points. The purpose of the present invention is to provide a protective fence that can significantly improve the shock absorption performance by the rhombus metal mesh while suppressing the displacement of the fence height with a simple structure. It is to provide.

The present invention is a protective fence in which a rhombus wire mesh is horizontally installed between a plurality of support columns, and the mesh defined by two row lines in which the rhombus wire mesh is flat exhibits a vertically long rhombus, The opposing angle in the vertical direction is formed as an acute angle, and the opposing angle in the horizontal direction of the mesh is formed as an obtuse angle.
In another embodiment of the present invention, the upper and lower sides of the rhombus wire mesh are slidably attached to a plurality of horizontal ropes provided between adjacent columns.
In another embodiment of the present invention, the left and right sides of the rhombus wire mesh are attached to adjacent struts.
In another embodiment of the present invention, the end portions of the rhombus metal mesh column lines are located on the upper and lower sides of the rhombus metal mesh.
In another embodiment of the present invention, the opposing angle in the left-right direction of the mesh is 140 ° to 100 °, or 120 ° (plus or minus 10 °).

The present invention has a simple structure in which a rhombus wire mesh is formed into a vertically long rhombus, and the shock absorption performance by the rhombus wire mesh can be significantly improved while suppressing displacement of the fence height.
Furthermore, in the present invention, it is possible to demonstrate high shock absorption performance by changing the mesh shape while increasing the thickness of the wire mesh body and making the row line composed of multiple steel strands, while being a flat diamond wire mesh. The problem of increasing the weight and capacity of the rhombus wire mesh and the problem of high cost can also be solved.

It is explanatory drawing of the protection fence which concerns on this invention, (a) is a front view of a protection fence, (b) is a longitudinal cross-sectional view of a rhombus metal mesh Front view of diamond wire mesh before hit Front view of diamond wire mesh at the time of impact Illustration of a conventional wire fence for guard fence

  A preferred embodiment for carrying out the present invention will be described with reference to the drawings.

<1> Protective fence The protective fence of the present invention will be described with reference to FIG. 1. The protective fence is a strip-shaped bridge extending between a plurality of support columns 30 erected at predetermined intervals and adjacent columns 30. The rhombus wire mesh 10 and a plurality of horizontal ropes 31 that support the rhombus wire mesh 10 are provided.
A plurality of horizontal ropes 31 are stretched between the heads and the skirts of the adjacent columns 30 in a multistage manner.
In this example, a mode in which the horizontal rope 31 is inserted into the mesh 13 on the upper and lower sides of the rhombus metal mesh 10 to support the rhombus metal mesh 10 will be described. However, as shown in FIG. It may be installed and the rhombus wire mesh 10 may be supported on the horizontal rope 31 by the connecting coil 32 or the like.
The number of horizontal ropes 31 laid horizontally between the support columns 30 is not limited to two, and may be three or more. In any case, the rhombus wire mesh 10 is slidably attached to the horizontal rope 31. Yes.
In this example, the left and right sides of the rhombus metal mesh 10 are attached to, for example, a vertical rope 33 fixed to the support column 30. However, the left and right sides of the rhombus metal mesh 10 may be free without being fixed to the support column 30. .

<2> Rhombus Wire Mesh The rhombus wire mesh 10 is a wire mesh that is formed by flattening a plurality of spiral row lines 11 and is used in an upright state.
The rhombus wire mesh 10 has a total length that can be horizontally mounted in the span unit of the support column 30, or has a total length that can be horizontally mounted across a plurality of spans.
In the present invention, the shape of the mesh 13 is improved so as to easily exhibit the deformation performance inherent to the wire mesh body while suppressing the displacement amount of the fence height to be small.

<2.1> Column Line Arrangement Direction All the plurality of column lines 11 are used in the vertical direction.
Accordingly, the end portion 12 group of column lines 11 subjected to knuckle processing, twist processing, and the like are positioned on the upper and lower sides of the rhombus metal mesh 10, and the continuous column lines 11 exhibiting waveforms are positioned on the left and right sides of the rhombus metal mesh 10.
When the horizontal rope 31 is inserted into the upper and lower sides of the rhombus metal mesh 10, the outermost mesh 13 having the terminal portion 12 may be avoided and the inner mesh 13 may be inserted.

<2.2> Mesh shape The mesh 13 defined by the two row lines 11 having a flat shape has a vertically long rhombus.

<2.3> opposite angle theta ₁ in the vertical direction of the mesh of the angular mesh 13 is formed at an acute angle, opposite angle theta ₂ in the lateral direction is formed at an obtuse angle.
The reason why the mesh 13 is formed in a vertically long rhombus is to make it easy to exert the deformation performance of the rhombus metal mesh 10 while suppressing the displacement in the height direction of the rhombus metal mesh 10 to be small.
Specifically, the opposing angle θ _{2 in} the left-right direction of the mesh 13 obtained from the bending angle of the column line 11 is an obtuse angle of 140 ° to 100 °, and preferably 120 ° (plus or minus 10 °).
When the opposing angle θ _{2 in} the left-right direction of the mesh 13 exceeds 140 °, it is difficult to bend the row lines 11, and when the opposing angle θ ₂ is less than 100 °, the rhombus metal mesh 10 may sufficiently exhibit deformation performance. Can not.

Since the opposing angle θ _{1 in} the vertical direction of the mesh 13 is a complementary angle of the opposing angle θ ₂ , the opposing angle θ _{1 in} the vertical direction of the mesh 13 is an acute angle of 40 ° to 80 °, and a preferable angle is 60 ° (plus or minus 10 degrees).

<2.4> Manufacture of Diamond Wire Mesh Using the known net making machine, the diamond wire mesh 10 described above can be manufactured by obtuse angle processing of the row lines 11.
Since the manufacturing method of the rhombus metal net | network using a net making machine is known, the description is abbreviate | omitted.
The rhombus wire mesh 10 manufactured by continuing obtuse angle processing in row line processing (bending of wire rods) at the time of net making can reduce the amount of plastic processing of wire rods and suppress metal brittleness caused by processing. It has a positive effect on the shearing force at the intersection of the wire mesh body.

[Characteristics of diamond-shaped wire mesh]
Next, characteristics of the rhombus wire mesh 10 applied to the protective fence will be described.

<1> Internal space area of mesh If the mesh composed of two column lines has the same mesh size, it is manufactured with an internal space area of the mesh 13 of the rhombus metal mesh 10 subjected to obtuse angle processing and a standard angle of 85 °. When the inner space areas of the meshes are compared, the inner space area of the former mesh 13 becomes narrower, so that the outflow of small diameter collapsed objects such as pebbles from the rhombus metal mesh 10 can be suppressed.

<2> Change in shape of mesh at the time of receiving The shape change of mesh 13 at the time of receiving will be described in detail with reference to FIGS. FIG. 2 shows the mesh 13 before receiving, and FIG. 3 shows the mesh 13 when receiving.
When falling stones or the like collide with the rhombus metal mesh 10, the rhombus metal mesh 10 is deformed toward the valley side.
At this time, when the tensile force acts on the mesh 13 in the vertical and horizontal directions, the mesh 13 is deformed from a vertically long rhombus to a horizontally long rhombus.
The angle change and dimensional change of the mesh 13 accompanying the shape change of the mesh 13 will be described in detail below.

<2.1> for exhibiting angular change受撃previous mesh 13 is elongated diamond mesh, vertically opposite angle theta ₁ is being gradually increased in the rhombic wire mesh 10 is受撃mesh 13, the left-right direction of the mesh 13 ₂ gradually decreases opposing angle theta.
That is, the opposing angle θ _{1 in} the vertical direction of the mesh 13 changes from an acute angle to an obtuse angle, while the opposing angle θ _{2 in} the left-right direction of the mesh 13 changes from an obtuse angle to an acute angle.

<2.2> with the vertical angular change of the facing angle theta ₁ of the dimensional change mesh 13 mesh, the transverse width of the undeformed mesh 13 extends from L ₁ to L _2.
As the opposing angle θ _{2 in} the left-right direction of the mesh 13 changes, the height of the mesh 13 before deformation is reduced from H ₁ to H ₂ , but the amount of displacement is very small.
This is because the upper and lower sides of the rhombus metal mesh 10 on the acute angle side (opposing angle θ ₁ ) of the mesh 13 are restricted, and the displacement of the mesh 13 in the vertical direction is restricted.
Therefore, at the time of impact, the horizontal width of the mesh 13 is greatly expanded, but the height does not change so much.

<3> Amount of displacement in the vertical and horizontal directions of the diamond wire mesh As described above, the displacement of the rhombus wire mesh 10 in the vertical direction Y as the mesh 13 is deformed from a vertically long diamond shape to a horizontally long diamond shape at the time of impact. While the amount is suppressed to be small, the amount of elongation displacement in the lateral direction X is large.
That is, since the rhombus metal mesh 10 has almost no change in the height dimension, the height of the guard fence can be reduced.

<4> Absorption of Impact Energy Since the amount of elongation deformation in the lateral direction X by the rhombus metal mesh 10 becomes very large as described above, the impact absorption performance is significantly improved compared to the conventional case.
In particular, in the rhombus metal mesh 10 manufactured with the processing angle of the row lines 21 being obtuse, the deformation characteristics with respect to the out-of-plane load are superior to those of the rhombus metal mesh manufactured at a standard angle of 85 °.

10 .... Rhombus wire mesh ...... Line 12 ...... Terminal 13 ...... Mesh 30 ...... Post 31 ... Horizontal rope 33 ... Vertical rope

Claims (6)

A protective fence with a rhombus wire mesh placed between a plurality of columns,
The mesh formed by two row lines in which the rhombus wire mesh is flat exhibits a vertically long rhombus,
The vertical angle of the mesh is formed as an acute angle, and the horizontal angle of the mesh is formed as an obtuse angle,
Guard fence.   The protective fence according to claim 1, wherein upper and lower sides of the rhombus wire mesh are slidably attached to a plurality of horizontal ropes provided between adjacent struts.   The protective fence according to claim 1 or 2, wherein left and right sides of the rhombus wire mesh are attached to adjacent struts.   The guard fence according to any one of claims 1 to 3, wherein terminal portions of the rhombus wire mesh are located on upper and lower sides of the rhombus wire mesh.   The protective fence according to claim 1, wherein an opposing angle in a horizontal direction of the mesh is 140 ° to 100 °.   The protective fence according to claim 1, wherein an opposing angle in the left-right direction of the mesh is 120 ° (plus or minus 10 °).

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