JP2005213747A - Snowslide/rockfall protection fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a snowslide/rockfall protection fence capable of withstanding larger impact force, having a longer service life, and facilitating construction and maintenance. <P>SOLUTION: This snowslide/rockfall protection fence is provided with a plurality of posts 2 at predetermined spaces and a net body 4 shielding between the posts 2. The net body is formed in a hexagonal shape by mutually twisting the intersecting parts of a plurality of ropes, and the intersecting parts are provided with extra length parts. The net body 4 is installed so that the intersecting parts are horizontal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an avalanche / falling rock protection fence that disperses and absorbs impact force caused by avalanches and falling rocks by a net.

  Conventionally, in this type of avalanche / fall rock protection fence, pillars are provided at predetermined intervals, horizontal rope material is moored between each pillar in a state that allows horizontal sliding, and both ends of the horizontal rope material are fixed, The struts are shielded by a wire net hooked on a horizontal rope material, and the surplus length part formed by polymerizing the rope material in the middle of the horizontal rope material and the surplus length part are sandwiched with a certain force. When a tension higher than the set tension is applied to the horizontal rope material by the holding tool, the horizontal rope material is formed with a buffer part that absorbs the tension by extending the extra length while maintaining a constant frictional force. (For example, Patent Document 1). As a result, the shock can be absorbed by sliding the buffer portion formed in a part of the horizontal rope material before the impact is transmitted to the support column. By cooperating with the wire net, it is possible to absorb the impact more effectively than in the past.

Further, as shown in FIG. 5, the above-mentioned document discloses a wire net 20 knitted in a rhombus wire mesh shape.
Japanese Patent Publication No. 7-018134

  However, also in the above-mentioned document, the wire net 20 is a known wire 21 knitted in a rhombus network, and there is a concern that it cannot withstand a large impact force. Further, when one portion of the wire net breaks, the tear spreads to the whole, and there is a problem that the maintenance cost becomes high. Therefore, if the strength of the wire net can be improved, it is possible not only to withstand a greater impact force, but also to prolong the life of the protective fence itself and further reduce maintenance costs. On the other hand, if only the strength is to be secured, it is conceivable to use a net formed by welding a steel rod or the like. Or, considering maintenance management, etc., the practicality is poor.

  Accordingly, in view of the above-described problems, the present invention has an object to provide an avalanche / falling rock protection fence that can withstand a greater impact force, has a long service life, and is easy to construct and maintain.

  In order to achieve the above object, an avalanche / falling rock protection fence according to the present invention is provided with a plurality of struts at predetermined intervals, and the avalanche / falling rock protection fence in which the struts are shielded by a net body, It is characterized by being knitted into a square.

  Further, the mesh body may be knitted into a hexagon by twisting the intersections of a plurality of ropes.

  Here, an extra length portion may be provided at the intersection.

  Moreover, you may install a net | network body so that the said cross | intersection part may become horizontal.

  According to the avalanche / falling rock protection fence according to claim 1 of the present invention, since the mesh body formed in the hexagonal shape is provided, the impact force can be efficiently dispersed and absorbed by the mesh body.

  In addition, according to the avalanche / falling rock protection fence according to claim 2, since it is formed in a hexagonal shape by twisting the intersection of the ropes, it is difficult to lose its shape, and each mesh has independent strength. Since it has, even if one part breaks, since a tear does not spread to others, durability can be improved.

  Further, according to the avalanche / falling rock protection fence according to claim 3, since the extra length portion is provided at the intersection, the impact force can be dispersed and absorbed more effectively, so it can withstand a greater impact force. it can.

  Further, according to the avalanche / falling rock protection fence according to claim 4, the mesh body is installed so that the intersection is horizontal, so that when the impact force is applied to the mesh body, the mesh body is in the direction between the columns. It can stretch and absorb impact force effectively.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view schematically showing an avalanche / falling rock guard according to the present embodiment. FIG. 2 is a cross-sectional view schematically showing an avalanche / falling rock guard according to the present embodiment. FIG. 3 is a partially enlarged view schematically showing the wire net according to the present embodiment.

  The avalanche / fall rock protection fence is provided with a concrete foundation 1 along a slope or along a slope, and a plurality of support pillars 2 are erected on the concrete foundation 1 at a predetermined interval, and a horizontal rope material 3 which is a horizontal main wire between the support pillars. And a wire net 4, which is a net body that is hung between the support rods 2 on the horizontal rope member 3.

  The column 2 is made of H-shaped steel, concrete column, steel pipe, concrete-filled steel pipe, or the like. In this example, H-shaped steel is used and its lower end is fixed to the concrete foundation 1. A horizontal rope member 3 is provided in a plurality of stages between the columns 2, and a locking part 8 for locking the horizontal rope material 3 is provided on the column 2. A hook for locking the horizontal rope member 3 on the side surface of the support 2 may be used. Moreover, the both ends of the said horizontal rope material 3 are being fixed to the said support | pillar 2 and another member, respectively.

  The wire net 4 is a known wire 5, 5A that is a rope, for example, an iron wire plated with aluminum or zinc-aluminum alloy is crossed at a certain angle a, and the wire 6 is crossed several times, for example, three times. Twist and connect. This angle a is 120 ° in the case of a regular hexagon, but it goes without saying that it can be appropriately selected according to the shape of the hexagon. The tips of the wires 5 and 5A connected at the intersection 6 are branched at a constant angle a, crossed at the same angle a as the other wires 10 and 11, and connected by twisting the same number of times as described above. By repeating such a connecting operation, the wires are knitted into a hexagonal shape, and a hexagonal net is formed on the entire wire net 4. The wire net 4 may be manufactured by transporting it to the site in advance, or attaching it to the horizontal rope member 2 at the site. The wire net 4 is arranged so that the intersecting portion 6 is horizontal and is hooked on a horizontal rope member 3 to shield the space between the support columns 2.

  When an impact force due to falling rocks or avalanches is applied to the wire net 4, a force acts on the wire net 4 in the direction between the columns 2. This impact force is absorbed by normal elastic deformation caused by the cooperation of the wires constituting the wire net 4 and the horizontal rope member 3. At this time, since the intersecting portion 6 is oriented in the horizontal direction, that is, in the direction between the support columns 2, it can withstand a large impact force as compared with the rhombus. Furthermore, since the number of wires in the pulling direction per unit length is large, it can withstand a greater impact force.

  With such a configuration, in this embodiment, in accordance with claim 1, in the avalanche / falling rock protection fence in which a plurality of support columns 2 are provided at predetermined intervals and the space between the support columns 2 is shielded by the wire network 4, the wire net Since 4 is knitted into a hexagon, the wire net 4 can efficiently disperse and absorb the impact force.

  Further, in this embodiment, corresponding to claim 2, since the wire net 4 is knitted into a hexagon by twisting the intersecting portions 6 of the plurality of wires 5, the shape of the wire net 4 is not easily lost. Since each one has an independent strength, even if a portion breaks, the tear does not spread to others, so that durability can be improved.

  Further, in this embodiment, corresponding to claim 3, since the wire net 4 is installed so that the intersecting portion 6 is horizontal, when an impact force is applied to the wire net 4, the wire net is directed in the direction between the columns 2. The net 4 can extend and absorb the impact force effectively.

  Next, another embodiment of the present invention will be described with reference to FIG. FIG. 4 is a partially enlarged view schematically showing the wire net according to the present embodiment.

  The wire nets 4 are crossed at a constant angle a and connected by twisting at a crossing portion 6A a plurality of times, for example, twice. The connected wires 5 and 5A are bent to form the extra length portion 7, and further twisted twice to form the intersecting portion 6B. The adjacent intersecting portions 6A and 6B have opposite twist directions. The tips of the wires 5 and 5A connected at the crossing portion 6B are branched at a constant angle a, crossed at the same angle a as the other wires 10 and 11, and twisted the same number of times as above to be connected at the crossing portion 6A. The surplus length portion 7 is formed, and further twisted the same number of times and connected at the intersection 6B. By repeating such a connecting operation, the wires are knitted into a hexagonal shape, and a hexagonal net is formed on the entire wire net 4. The extra length 7 is preferably formed on the same plane as the wire net 4 in order to save space and prevent catching.

  With such a configuration, when an impact force is applied to the wire net 4, the extra length portion 7 expands according to the impact force, and the planar wire net 4 is deformed. That is, when an impact force is locally applied, the extra length portion 7 expands accordingly, thereby allowing local deformation of the wire net 4 and effectively dispersing and absorbing the impact force. The breakage of the net 4 can be prevented, and the instantaneous impact force transmitted to the support 2 can be reduced.

  Thus, in the present embodiment, in correspondence with claim 3, since the surplus portion 7 is provided at the intersecting portion 6, the impact force can be dispersed and absorbed more effectively, so that it can withstand a greater impact force. .

  The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, the number of twists of the wire at the intersection may be appropriately changed according to the size of the hexagon that forms the wire net.

It is a front view which shows typically the avalanche and falling rock protection fence which concerns on 1st Example of this invention. It is sectional drawing same as the above. It is a partial enlarged view showing a wire net typically. It is the elements on larger scale which show typically the wire net which concerns on 2nd Example of this invention. It is the elements on larger scale which show typically the wire net concerning a prior art example.

Explanation of symbols

2 Prop 4 Wire net (net)
5,5A wire (rope)
6, 6A, 6B Intersection 7 Extra length

Claims (4)

An avalanche / falling rock protection fence provided with a plurality of supports at predetermined intervals and shielded between the supports by a mesh, wherein the mesh body is knitted in a hexagonal shape. The avalanche / falling rock protection fence according to claim 1, wherein the mesh body is knitted into a hexagonal shape by twisting intersections of a plurality of ropes. 3. An avalanche / falling rock protection fence according to claim 2, wherein an extra length is provided at the intersection. The avalanche / falling rock protection fence according to claim 2 or 3, wherein a net is installed so that the intersecting portion is horizontal.

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