JP4739992B2 - Rockfall prevention fence, structure equipped with rockfall prevention fence, and construction method of rockfall prevention fence - Google Patents

Rockfall prevention fence, structure equipped with rockfall prevention fence, and construction method of rockfall prevention fence Download PDF

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JP4739992B2
JP4739992B2 JP2006064194A JP2006064194A JP4739992B2 JP 4739992 B2 JP4739992 B2 JP 4739992B2 JP 2006064194 A JP2006064194 A JP 2006064194A JP 2006064194 A JP2006064194 A JP 2006064194A JP 4739992 B2 JP4739992 B2 JP 4739992B2
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hollow
prevention fence
hollow column
wire
side end
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JP2006283552A (en
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雅敬 木下
雅一 杉本
康嗣 吉村
暢彦 桂
武美 堤野
駿一 小林
直人 岩佐
堀  謙吾
勝也 石田
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Nippon Steel Corp
Nippon Steel Metal Products Co Ltd
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この発明は、落石防止柵、落石防止柵を備えた構造物、および落石防止柵の施工方法に関する。   The present invention relates to a rockfall prevention fence, a structure provided with a rockfall prevention fence, and a construction method of the rockfall prevention fence.

従来より斜面等からの落石を受け止める落石防止柵として種々のものが提案されている。広く用いられている落石防止柵の構造として、例えば、ロープの口開きを一定に規制しつつ、衝撃吸収性能の向上が図れる衝撃吸収技術を提供することを課題とした、所定の間隔を隔てて立設した支柱間に複数のロープを多段的に横架した衝撃吸収柵において、多段的に配置した複数のロープに跨り、ロープの交差方向に向けて波状の連結材を配置し、前記多段的に配置したロープと該連結材と交差部を締結具で締結したことを特徴とする、衝撃吸収柵(特許文献1参照)などが提案されている。   Conventionally, various types of rock fall prevention fences have been proposed for receiving rock fall from slopes. As a widely used rock fall prevention fence structure, for example, to provide a shock absorbing technology that can improve the shock absorbing performance while restricting the opening of the rope to a certain distance, at a predetermined interval In an impact absorbing fence in which a plurality of ropes are horizontally mounted between standing pillars, a plurality of multi-staged ropes are straddled, and a wavy connecting material is arranged in the crossing direction of the ropes. A shock absorbing fence (see Patent Document 1), which is characterized in that a rope, a connecting member, and a crossing portion are fastened with a fastener.

また、合理的に形成された衝撃吸収材を使用して、能率的な施工が行え、製作費用が高価となることのない落石防護柵を提供することを課題とした、傾斜面に立設した支柱間に衝撃吸収材を横架して構成する落石防護柵において、前記支柱間に横架した衝撃吸収材は、受衝方向に対して傾斜した斜材を含む立体トラス構造体であることを特徴とする、落石防護柵(特許文献2参照)なども提案されている。
特開2003−184035号公報 特開2001−64917号公報 特開2003−275802号公報 特開2004−337892号公報
In addition, using shock absorbers that are reasonably formed, it was erected on an inclined surface, with the goal of providing a rockfall protection fence that could be efficiently constructed and that would not be expensive to manufacture. In the rockfall protection fence constructed by horizontally placing a shock absorber between struts, the shock absorber that is straddled between the struts is a three-dimensional truss structure including an oblique member inclined with respect to the receiving direction. A characteristic rockfall protection fence (see Patent Document 2) has also been proposed.
Japanese Patent Laid-Open No. 2003-184035 JP 2001-64917 A JP 2003-275802 A JP 2004-337892 A

しかしながら、従来技術には以下のような問題点が残されていた。例えば、支柱間に防護ネットを横架した構造であると、防護ネットによる衝撃吸収性能が大きくないだけでなく、柵全体を大型で大重量に設計する必要があり、所定の衝撃吸収性能を得るためにはコストが高くなりやすいという難点があった。   However, the following problems remain in the prior art. For example, if the protection net is installed horizontally between the support columns, not only the shock absorption performance by the protection net is not great, but the entire fence needs to be designed to be large and heavy, and the specified shock absorption performance can be obtained. For this reason, there is a difficulty that the cost tends to be high.

他方、この点を改善するため、摩擦抵抗式の緩衝具を用い、ロープと緩衝具との間の摺動抵抗により衝撃を吸収する技術や、ロープの固定部にエネルギー吸収機能を持たせる技術なども提案されてはいるが、これらの技術を採用するに際し、多数の緩衝具等の治具や部品を用いる必要がある。そのため、緩衝具等の設置作業やロープの把持作業などに多くの人手と時間がかかり、低い作業効率や高コストといった問題が存在した。   On the other hand, in order to improve this point, a friction resistance type shock absorber is used, a technique for absorbing impact by sliding resistance between the rope and the shock absorber, a technique for giving the rope fixing part an energy absorption function, etc. However, when these techniques are adopted, it is necessary to use a large number of jigs and parts such as shock absorbers. Therefore, it takes a lot of manpower and time for installation work such as shock absorbers and gripping work of the rope, and there are problems such as low work efficiency and high cost.

更に、落石に伴う受撃時において防護ネットの変形量が大きくなりやすいため、柵の設置場所が各種交通機関施設(道路、鉄道線路など)や住宅等に近接する場合は、当該柵の採用が難しいという問題があった。したがって、柵の設置場所に制約を受けやすく施工の自由度が低いという難点もあった。   Furthermore, since the amount of deformation of the protective net is likely to increase during the impact caused by falling rocks, if the installation location of the fence is close to various transportation facilities (roads, railway tracks, etc.) or houses, the use of the fence is recommended. There was a problem that it was difficult. Therefore, there is a problem that the installation location of the fence is easily restricted and the degree of freedom in construction is low.

一方、立体トラス構造を採用した構造であると、立体トラス同士の接合が煩雑であり、設置現場での多くの手間と時間とがかかり、作業効率が良好ではなかった。しかも、煩雑になりがちな現場での接合作業を省略するために、当該接合作業を工場で予め行うとしても、製作される立体トラスが大きなブロックとなっていた。従って、設置現場にこの大型の立体トラスを搬入する際には、取り回しが難しくなり、大型のクレーン等を導入する必要があるなど機器導入コストの増大を招来しやすい課題があった。   On the other hand, in the structure using the three-dimensional truss structure, joining of the three-dimensional trusses is complicated, and it takes a lot of labor and time at the installation site, and the work efficiency is not good. Moreover, in order to omit the on-site joining work that tends to be complicated, even if the joining work is performed in advance in the factory, the solid truss to be manufactured has become a large block. Therefore, when this large three-dimensional truss is carried into the installation site, handling is difficult, and there is a problem that it is likely to cause an increase in equipment introduction cost, such as the need to introduce a large crane or the like.

そこで本発明はこのような課題に着目してなされたもので、良好な衝撃吸収性能を発揮すると共に、効率的かつ簡便な施工を可能とする、落石防止柵、落石防止柵を備えた構造物、落石防止柵の施工方法,および製造方法を提供する。   Therefore, the present invention has been made paying attention to such problems, and exhibits a good shock absorbing performance and enables efficient and simple construction, a structure provided with a rockfall prevention fence and a rockfall prevention fence. The construction method and manufacturing method of the rock fall prevention fence are provided.

上記目的を達成する本発明の落石防止柵は、落石を受け止めるための落石防止柵であって、螺旋の外径が線材の直径の約2倍である螺旋状に成形された線材を縦横に組み合わせた網部材にて構成され形状の自己保持が可能な中空柱体であり、当該中空柱体の側端部を構成する網部位は、縦方向の線材を配置しない構成である中空柱体を、延長方向において互いの側端部が重複するよう複数配置し、前記重複した側端部で囲まれる空間に棒状部材を挿入して前記中空柱体同士を互いに連結してなることを特徴とする(第1の発明)。 The rockfall prevention fence of the present invention that achieves the above object is a rockfall prevention fence for catching rockfalls, which is a combination of longitudinally and laterally shaped wire rods whose spiral outer diameter is about twice the diameter of the wire rod. Is a hollow column body that is configured by a net member and is capable of self-holding the shape , and the net part that constitutes the side end of the hollow column body is a hollow column body that is configured not to arrange a vertical wire , A plurality of the side end portions are arranged so as to overlap each other in the extending direction, and the hollow column bodies are connected to each other by inserting a rod-like member into a space surrounded by the overlapping side end portions ( First invention).

の発明は、第1の発明において、前記網部材の線材が、鋼製または合成樹脂製のいずれかであることを特徴とする。 A second invention is characterized in that, in the first invention, the wire of the mesh member is made of steel or synthetic resin.

の発明は、第1又は第2の発明において、前記中空柱体の水平断面が、円形、楕円形、多角形、隅部がR加工された多角形のいずれかであることを特徴とする。 A third invention is characterized in that, in the first or second invention, the horizontal section of the hollow column body is any one of a circle, an ellipse, a polygon, and a polygon in which corners are R-processed. To do.

の発明は、第1〜第のいずれかの発明において、前記中空柱体の中空部分に緩衝材を挿入又は充填したことを特徴とする。 According to a fourth invention, in any one of the first to third inventions, a buffer material is inserted or filled in a hollow portion of the hollow column body.

の発明は、第の発明において、前記緩衝材が、木材、木材チップ、発泡スチロール、発泡ウレタン、硬質ゴム、土砂、砕石、薄肉鋼管の少なくともいずれかからなることを特徴とする。 A fifth invention is characterized in that, in the fourth invention, the buffer material is made of at least one of wood, wood chip, polystyrene foam, urethane foam, hard rubber, earth and sand, crushed stone, and thin steel pipe.

の発明は、落石を受け止めるための落石防止柵を備えた構造物であって、螺旋の外径が線材の直径の約2倍である螺旋状に成形された線材を縦横に組み合わせた網部材にて構成され形状の自己保持が可能な中空柱体であり、当該中空柱体の側端部を構成する網部位は、縦方向の線材を配置しない構成である中空柱体を、延長方向において互いの側端部が重複するよう複数配置し、前記重複した側端部で囲まれる空間に棒状部材を挿入して前記中空柱体同士を互いに連結してなる落石防止柵を備えた構造物にかかる。 A sixth invention is a structure provided with a rockfall prevention fence for catching rockfalls, and is a mesh in which spirally formed wires whose outer diameter is approximately twice the diameter of the wires are combined vertically and horizontally It is a hollow column body that is configured by members and capable of self-holding the shape , and the net portion that constitutes the side end of the hollow column body is a hollow column body that is configured not to arrange a vertical wire , A structure provided with a rockfall prevention fence that is arranged in such a manner that side end portions thereof overlap each other and a rod-shaped member is inserted into a space surrounded by the overlapped side end portions to connect the hollow column bodies to each other. It takes.

の発明は、落石を受け止めるための落石防止柵の施工方法であって、螺旋の外径が線材の直径の約2倍である螺旋状に成形された線材を縦横に組み合わせた網部材にて構成され形状の自己保持が可能な中空柱体であり、当該中空柱体の側端部を構成する網部位は、縦方向の線材を配置しない構成である中空柱体を、延長方向において互いの側端部が重複するよう複数配置し、前記重複した側端部で囲まれる空間に棒状部材を挿入して前記中空柱体同士を互いに連結することを特徴とする落石防止柵の施工方法にかかる。 7th invention is the construction method of the rock fall prevention fence for catching a rock fall, Comprising: In the net | network member which combined the wire shape formed in the spiral shape whose outer diameter of a spiral is about twice the diameter of a wire rod vertically and horizontally A hollow column body that is configured and capable of self-holding its shape , and a net portion that constitutes a side end portion of the hollow column body is configured such that a hollow column body having a configuration in which no vertical wire is disposed is mutually connected in the extending direction. In a construction method of a rock fall prevention fence, wherein a plurality of side end portions are arranged so as to overlap each other, a rod-shaped member is inserted into a space surrounded by the overlapped side end portions, and the hollow column bodies are connected to each other. Take it.

の発明は、落石防止柵に使用する中空柱体の製造方法であって、略長方形の平板状の網部材における長手方向の両端部を、長手方向に所定の長さに渡って前記平板状の網部材に対して略直角となるように折り曲げた後、前記網部材が中空柱体を形成するように円筒状に丸めて両端部を突き合わせ、当該両端部を中空柱体の長さ方向に渡って挟持金物でボルト接合することを特徴とする中空柱体の製造方法にかかる。 8th invention is a manufacturing method of the hollow pillar used for a rock fall prevention fence, Comprising: The both ends of the longitudinal direction in the substantially rectangular flat plate-shaped net member are said flat plates over a predetermined length in a longitudinal direction. After being bent so as to be substantially perpendicular to the net-shaped net member, the net member is rounded into a cylindrical shape so as to form a hollow column body, and both end portions are butted, and the both end portions are in the length direction of the hollow column body. And a method for manufacturing a hollow column body characterized by bolting with a clamp metal.

の発明は、落石防止柵に使用する中空柱体の製造方法であって、第の発明において、前記挟持金物は、断面がL字状でボルト挿通孔を有する2つのL字状部材と、ボルト挿通孔を有する平鋼A及び平鋼Bとからなり、前記両端部において、前記突き合わせられた網部材の間に平鋼Aを挟み、前記略直角に折り曲げられた網部材の形状に合せて前記2つのL字状部材を前記両端部にそれぞれ設置し、前記平鋼Aと前記2つのL字状部材とで前記突き合わせられた網部材をボルト接合し、更に、前記平鋼Bを前記略直角に折り曲げられた側と反対側の前記中空柱体に設置して、前記2つのL字状部材とで前記網部材を挟んでボルト接合することを特徴とする中空柱体の製造方法にかかる。 9th invention is a manufacturing method of the hollow column used for a rock fall prevention fence, Comprising: In 8th invention, the said clamping metal object is two L-shaped members which have a L-shaped cross section and have a bolt insertion hole. And a flat steel A and a flat steel B having bolt insertion holes, and at both ends, the flat steel A is sandwiched between the abutted mesh members, and the shape of the mesh member is bent at a substantially right angle. In addition, the two L-shaped members are respectively installed at both ends, the mesh members that are butted together by the flat steel A and the two L-shaped members are bolted, and further, the flat steel B is A method for producing a hollow column body, comprising: installing the hollow column body on the opposite side to the side bent substantially at right angles, and bolting the mesh member between the two L-shaped members. It takes.

その他、本願が開示する課題、及びその解決方法は、発明の実施の形態の欄、及び図面により明らかにされる。   In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the embodiments of the present invention and the drawings.

本発明の落石防止柵、落石防止柵を備えた構造物、および落石防止柵の施工方法によれば、良好な衝撃吸収性能を発揮すると共に、効率的かつ簡便な施工が可能となる。   According to the falling rock prevention fence, the structure provided with the falling rock prevention fence, and the construction method of the falling rock prevention fence according to the present invention, it is possible to exhibit good shock absorbing performance and to perform efficient and simple construction.

以下に本発明の実施形態について図面を用いて詳細に説明する。本実施形態においては、一例として、山腹など傾斜の大きな法面の法尻近傍に本発明の落石防止柵を設置し、前記法面等からの落石を前記落石防止柵で受け止めてその衝撃を吸収する状況を想定するが、これに適用対象が限定されるものではなく、落石が生じうるいずれの状況にも本発明の落石防止柵は適用可能である。   Embodiments of the present invention will be described below in detail with reference to the drawings. In this embodiment, as an example, the rock fall prevention fence of the present invention is installed near the slope of a slope with a large slope such as a mountainside, and the fall rock from the slope is received by the rock fall prevention fence to absorb the impact. However, the application target is not limited to this, and the rockfall prevention fence of the present invention can be applied to any situation where rockfall may occur.

−−−落石防止柵の全体構造1−−−
図1は本実施形態の落石防止柵における形態例1を示す側面図であり、図2は本実施形態の落石防止柵における形態例1を示す、(a)平面図および正面図、(b)他の例の平面図である。以下、図1と図2を合わせて用いつつ説明を行う。ここで示す落石防止柵100は、地山10の法面11からの落石を受け止めるべく、前記法面11の法尻12の近傍において設置されるものである。そのため、前記地山10の適宜な切り土を行うなどして形成した路盤13中にコンクリートの基礎14を打設している。このコンクリート基礎14は、落石防止柵100を支持する基礎となり、例えばH型鋼、鋼管などの適宜な強度を備える支柱部材15の下端と固着している。
---- Overall structure of rockfall prevention fence 1 ---
FIG. 1 is a side view showing an example 1 of the rock fall prevention fence of the present embodiment, and FIG. 2 shows a form 1 of the rock fall prevention fence of the present embodiment, (a) a plan view and a front view, (b). It is a top view of another example. Hereinafter, description will be made using FIG. 1 and FIG. 2 together. The rock fall prevention fence 100 shown here is installed in the vicinity of the slope 12 of the slope 11 in order to catch the fall rock from the slope 11 of the natural ground 10. Therefore, a concrete foundation 14 is placed in a roadbed 13 formed by performing appropriate cutting of the natural ground 10. The concrete foundation 14 serves as a foundation for supporting the rock fall prevention fence 100 and is fixed to a lower end of a support member 15 having appropriate strength such as H-shaped steel or steel pipe.

更に、この支柱部材15は、前記コンクリート基礎14との一体化を確かなものとするため、例えば断面L字型のフランジ材16を当接し、このフランジ材16と前記コンクリート基礎14とをボルト・ナット17等により締結固定している。   Further, in order to make sure that the column member 15 is integrated with the concrete foundation 14, for example, a flange member 16 having an L-shaped cross section is brought into contact with the flange member 16. The nut 17 is fastened and fixed.

こうした、コンクリート基礎14および支持部材15は、前記路盤13上において必要な延長分だけ適宜な間隔を置いて前記法面11の横断方向に繰り返し施工されることとなる。勿論、上述したコンクリート基礎14の形成と支柱部材15の設置の工程については一例であり、本発明の落石防止柵をなす中空柱体を介して受ける、落石時の衝撃に抗しうる支持力を奏するものであれば、いずれの基礎および支柱部材の施工形態であってもよい。   The concrete foundation 14 and the support member 15 are repeatedly applied in the transverse direction of the slope 11 at an appropriate interval by a necessary extension on the roadbed 13. Of course, the above-described process of forming the concrete foundation 14 and installing the column member 15 is an example, and the supporting force that can resist the impact at the time of falling rock, which is received through the hollow pillar body forming the falling rock prevention fence of the present invention. As long as it plays, the construction form of any foundation and support | pillar member may be sufficient.

図2に示すように、上記支柱部材15の間は、線材21、22を縦横に組み合わせた網部材25にて構成され形状の自己保持が可能な中空柱体20を、前記法面11の横断方向に連結することで壁面を形成している。この中空柱体20は、前記網部材25を水平断面が円形、楕円形、多角形、隅部がR加工された多角形のいずれかに成形してなしたものである。   As shown in FIG. 2, a space between the strut members 15 is formed by a net member 25 in which wires 21 and 22 are vertically and horizontally combined, and a hollow column body 20 capable of self-holding the shape is crossed across the slope 11. The wall surface is formed by connecting in the direction. This hollow column 20 is formed by molding the mesh member 25 into one of a circular shape, an elliptical shape, a polygonal shape, and a polygonal shape in which corners are rounded.

図3は本実施形態における中空柱体の連結手順を示す図である。中空柱体20同士の連結にあたっては、前記法面11の横断方向において互いの側端部26が重複するよう配置し、前記重複した側端部26で囲まれる空間27に棒状材30を挿入している。このような施工を行うことで前記中空柱体20同士を互いに連結することとなる。したがって、溶接やボルト締結といった作業や特殊部材、特殊工具等を中空柱体20同士の連結に用いることがないため、簡便で施工性の良い施工が可能となる。 Figure 3 is a diagram showing a connection procedure of the hollow pillar body in the present embodiment. When connecting the hollow columnar bodies 20, the side end portions 26 are arranged so as to overlap each other in the transverse direction of the slope 11, and the rod-shaped material 30 is inserted into a space 27 surrounded by the overlapped side end portions 26. ing. By performing such construction, the hollow column bodies 20 are connected to each other. Therefore, work such as welding and bolt fastening, special members, special tools, and the like are not used to connect the hollow column bodies 20 to each other, so that simple and good workability can be achieved.

側端部26を重複させるにあたっては、中空柱体20の側端部26を構成する部位の網部材25において、縦方向の線材21を配置しないものとする。縦方向の線材21が配置されておらず横方向の線材22のみであれば、前記棒状材30の前記空間27への挿入を妨げることがない上、何より側端部26同士を嵌め合いやすくなり重複処理が円滑に行えることとなる。 In order to overlap the side end portion 26, the mesh member 25 of the portion constituting the side edge 26 of the hollow cylindrical body 20, and shall not place the longitudinal direction of the wire 21. If the vertical wire 21 is not disposed and only the horizontal wire 22 is disposed, the insertion of the rod-shaped material 30 into the space 27 is not hindered, and the side end portions 26 can be easily fitted together. Duplicate processing can be performed smoothly.

なお、中空柱体20同士の連結方法の参考例として、前記重複した側端部26における前記網部材25に前記線材のうち縦方向の線材21を配置する手法もある。この手法については後述する(図9)。 Incidentally, as a reference example of the hollow pillar 20 between consolidation method, there is a method of placing the longitudinal direction of the wire 21 of the wire in the network member 25 at the side edge 26 and the overlapping. This method will be described later (FIG. 9).

図2に示す例では、前記支柱部材15と前記中空柱体20との取り合いを図るため、支柱部材15の側部近傍に補助棒状材31を配置し、これら支柱部材15と補助棒状材31とを挿通させる補助中空柱体28を設けている。この場合、前記中空柱体20同士の連結と同様に、前記補助中空柱体28および中空柱体20を各々の側端部26で重複させ、この重複した側端部26で囲まれる空間27に補助棒状材31を挿入することとなる。   In the example shown in FIG. 2, an auxiliary bar-shaped material 31 is disposed in the vicinity of the side of the column member 15 in order to connect the column member 15 and the hollow column body 20. Auxiliary hollow column body 28 is provided to allow insertion of. In this case, similarly to the connection between the hollow column bodies 20, the auxiliary hollow column body 28 and the hollow column body 20 are overlapped at the side end portions 26, and the space 27 surrounded by the overlapped side end portions 26 is formed. The auxiliary rod-shaped material 31 will be inserted.

棒状材30、補助棒状材31の形状は、特に限定されず、角柱状、円柱状等を適宜使用できるが、斜面等の地形が、例えば図2(b)で示す地山10の法面11における法尻12の形状のように、直線状ではなく変化するような状況に応じて中空柱体20や補助中空柱体28の連結時の角度を変える必要がある場合は、角度変更が容易となることから円柱状が好ましい。   The shapes of the rod-shaped material 30 and the auxiliary rod-shaped material 31 are not particularly limited, and a prismatic shape, a cylindrical shape, or the like can be used as appropriate, but the topography of the slope 10 is, for example, a slope 11 of the natural ground 10 shown in FIG. If it is necessary to change the angle at the time of connection of the hollow column body 20 or the auxiliary hollow column body 28 according to the situation that changes instead of a straight line shape, such as the shape of the heel 12 in FIG. Therefore, a cylindrical shape is preferable.

なお、前記支柱部材15と前記補助中空柱体28との固定が必要な場合は、例えば、前記補助中空柱体28を所定面積覆う圧接片70を設置し、この圧接片70を支柱部材15とボルト71による締結を行うことで対応できる。   When the support member 15 and the auxiliary hollow column 28 need to be fixed, for example, a pressure contact piece 70 that covers the auxiliary hollow column 28 with a predetermined area is installed, and the pressure contact piece 70 is connected to the support member 15. This can be dealt with by fastening with the bolt 71.

また、前記中空柱体20の中空部分29に、間伐材等の木材3や、発泡ウレタン4などの緩衝材5を挿入又は充填することができる。緩衝材5としては、その他木材チップ、発泡スチロール、硬質ゴム、土砂、砕石、薄肉鋼管なども用いることができる。それぞれ、中空柱体に挿入又は充填することで、優れた緩衝作用を発揮することができる。この挿入又は充填を行うにあたっては、中空柱体20の緩衝性能を確保するべく、中空部分29における緩衝材5の配置は、緩衝材の硬さや性能に応じて、適正な緩衝作用を発揮できるように、その配置の密度等を調節するとよい。例えば、間伐材や砕石や鋼管等の比較的硬いものを挿入するときには、その配置が粗となるよう配慮する。一方、発泡ウレタンや発泡スチロール等の材料自体に緩衝機能を有するものは密に充填、配置したほうが、緩衝作用をより有効に活用できる。   Further, the hollow portion 29 of the hollow column 20 can be inserted or filled with a wood 3 such as a thinning material or a cushioning material 5 such as urethane foam 4. As the buffer material 5, other wood chips, polystyrene foam, hard rubber, earth and sand, crushed stone, thin steel pipes and the like can be used. Each of them can exhibit an excellent buffering action by being inserted or filled in the hollow column. In performing this insertion or filling, the arrangement of the cushioning material 5 in the hollow portion 29 can exert an appropriate cushioning action according to the hardness and performance of the cushioning material in order to ensure the cushioning performance of the hollow columnar body 20. In addition, the density of the arrangement may be adjusted. For example, when a relatively hard material such as thinned wood, crushed stone, or steel pipe is inserted, consideration is given to the rough arrangement. On the other hand, if the material itself having a buffer function, such as urethane foam or polystyrene foam, is closely packed and arranged, the buffer action can be utilized more effectively.

このように、中空部分29における緩衝材5の施工を行うことで、受撃時における当該緩衝材5によるエネルギー吸収が期待できる一方で、中空柱体20が潰れることによるエネルギー吸収を期待しにくい代わりに、大きな変形を抑制することもできる。従って、落石防止柵100の設置現場が各種交通機関施設や住宅等に接近する場合にもそれらに影響を及ぼすことが少なくなり、施工範囲の自由度が高まることとなる。更には、間伐材などの有効利用を図ることにもつながる。   In this way, by performing the buffer material 5 in the hollow portion 29, energy absorption by the buffer material 5 at the time of impact can be expected, while energy absorption due to the collapse of the hollow column 20 is unlikely to be expected. In addition, large deformation can be suppressed. Therefore, even when the installation site of the rock fall prevention fence 100 approaches various transportation facilities, houses, etc., they are less affected and the degree of freedom of the construction range is increased. Furthermore, it leads to effective use of thinned wood.

−−−落石防止柵の全体構造2−−−
図4は本実施形態の落石防止柵における形態例2を示す側面図であり、図5は本実施形態の落石防止柵における形態例2を示す正面図である。以下、図4と図5を合わせて用いつつ説明を行う。ここで示す落石防止柵100は、先に示した全体構造1の例と同様に、地山10の法面11からの落石を受け止めるべく、前記法面11の法尻12の近傍において設置されるものである。そのため、前記地山10の適宜な切り土を行うなどして形成した路盤13中にコンクリートの基礎14を打設している。このコンクリート基礎14は、落石防止柵100を支持する基礎となり、例えばH型鋼、鋼管などの適宜な強度を備える支柱部材15の下端と固着している。
---- Overall structure of rockfall prevention fence 2 ---
FIG. 4 is a side view showing a second example of the rock fall prevention fence of the present embodiment, and FIG. 5 is a front view showing a second example of the rock fall prevention fence of the present embodiment. Hereinafter, description will be made using FIG. 4 and FIG. 5 together. The rock fall prevention fence 100 shown here is installed in the vicinity of the slope 12 of the slope 11 in order to receive the fall rock from the slope 11 of the natural ground 10 as in the example of the overall structure 1 shown above. Is. Therefore, a concrete foundation 14 is placed in a roadbed 13 formed by performing appropriate cutting of the natural ground 10. The concrete foundation 14 serves as a foundation for supporting the rock fall prevention fence 100 and is fixed to a lower end of a support member 15 having appropriate strength such as H-shaped steel or steel pipe.

更に、この支柱部材15は、前記コンクリート基礎14との一体化を確かなものとするため、例えば断面L字型のフランジ材16を当接し、このフランジ材16と前記コンクリート基礎14とをボルト・ナット17等により締結固定している。   Further, in order to make sure that the column member 15 is integrated with the concrete foundation 14, for example, a flange member 16 having an L-shaped cross section is brought into contact with the flange member 16. The nut 17 is fastened and fixed.

こうした、コンクリート基礎14および支持部材15は、前記路盤13上において必要な延長分だけ適宜な間隔を置いて前記法面11の横断方向に繰り返し施工されることとなる。勿論、上述したコンクリート基礎14の形成と支柱部材15の設置の工程については一例であり、本発明の落石防止柵をなす中空柱体を介して受ける、落石時の衝撃に抗しうる支持力を奏するものであれば、いずれの基礎および支柱部材の施工形態であってもよい。   The concrete foundation 14 and the support member 15 are repeatedly applied in the transverse direction of the slope 11 at an appropriate interval by a necessary extension on the roadbed 13. Of course, the above-described process of forming the concrete foundation 14 and installing the column member 15 is an example, and the supporting force that can resist the impact at the time of falling rock, which is received through the hollow pillar body forming the falling rock prevention fence of the present invention. As long as it plays, the construction form of any foundation and support | pillar member may be sufficient.

図4に示すように、上記支柱部材15の間は、線材21、22を縦横に組み合わせた網部材25にて構成され形状の自己保持が可能な中空柱体20を、前記法面11の横断方向に連結することで壁面を形成している。この中空柱体20は、前記網部材25を水平断面が円形、楕円形、多角形、隅部がR加工された多角形のいずれかに成形してなしたものである。   As shown in FIG. 4, between the support members 15, a hollow column 20 configured by a net member 25 in which wires 21 and 22 are vertically and horizontally combined and capable of self-holding a shape is crossed across the slope 11. The wall surface is formed by connecting in the direction. This hollow column 20 is formed by molding the mesh member 25 into one of a circular shape, an elliptical shape, a polygonal shape, and a polygonal shape in which corners are rounded.

中空柱体20同士の連結にあたっては、図3で既に示したように、前記法面11の横断方向において互いの側端部26が重複するよう配置し、前記重複した側端部26で囲まれる空間27に棒状材30を挿入している。このような施工を行うことで前記中空柱体20同士を互いに連結することとなる。したがって、溶接やボルト締結といった作業や特殊部材、特殊工具等を中空柱体20同士の連結に用いることがないため、簡便で施工性の良い施工が可能となる。側端部26を重複させるにあたっては、中空柱体20の側端部26を構成する部位の網部材25において、縦方向の線材21を配置しないものとする。縦方向の線材21が配置されておらず横方向の線材22のみであれば、前記棒状材30の前記空間27への挿入を妨げることがない上、何より側端部26同士を嵌め合いやすくなり重複処理が円滑に行えることとなる。 When the hollow column bodies 20 are connected to each other, as already shown in FIG. 3, the side end portions 26 are arranged so as to overlap each other in the transverse direction of the slope 11, and are surrounded by the overlapping side end portions 26. A rod-shaped material 30 is inserted into the space 27. By performing such construction, the hollow column bodies 20 are connected to each other. Therefore, work such as welding and bolt fastening, special members, special tools, and the like are not used to connect the hollow column bodies 20 to each other, so that simple and good workability can be achieved. In order to overlap the side end portion 26, the mesh member 25 of the portion constituting the side edge 26 of the hollow cylindrical body 20, and shall not place the longitudinal direction of the wire 21. If the vertical wire 21 is not disposed and only the horizontal wire 22 is disposed, the insertion of the rod-shaped material 30 into the space 27 is not hindered, and the side end portions 26 can be easily fitted together. Duplicate processing can be performed smoothly.

なお、中空柱体20同士の連結方法の参考例として、前記重複した側端部26における前記網部材25に前記線材のうち縦方向の線材21を配置する手法もある。この手法については後述する(図9)。 Incidentally, as a reference example of the hollow pillar 20 between consolidation method, there is a method of placing the longitudinal direction of the wire 21 of the wire in the network member 25 at the side edge 26 and the overlapping. This method will be described later (FIG. 9).

図5に示す例では、前記支柱部材15と前記中空柱体20との取り合いを図るため、支柱部材15の側部近傍に前記棒状材30を配置している。そして、これら支柱部材15と棒状材30とをボルト・ナット40により挿通し互いに締結することで固定している。この場合、前記支柱部材15の法面11との対向面に中空柱体20が配置されることとなり、支柱部材15自体を中空柱体20が挿通することはない。中空柱体20はあくまでも側端部26において棒状材30を挿通するのみである。   In the example shown in FIG. 5, the rod-shaped material 30 is disposed in the vicinity of the side portion of the column member 15 in order to connect the column member 15 and the hollow column body 20. And these support | pillar member 15 and the rod-shaped material 30 are fixed by inserting and fastening mutually with the volt | bolt nut 40. In this case, the hollow column 20 is disposed on the surface of the column member 15 facing the slope 11, and the hollow column 20 does not pass through the column member 15 itself. The hollow column 20 is merely inserted through the rod-shaped material 30 at the side end portion 26.

また、前記中空柱体20の中空部分29に、間伐材等の木材3や、発泡ウレタン4などの緩衝材5を挿入又は充填することができる。緩衝材5としては、その他木材チップ、発泡スチロール、硬質ゴム、土砂、砕石、薄肉鋼管なども用いることができる。それぞれ、中空柱体に挿入又は充填することで、優れた緩衝作用を発揮することができる。この挿入又は充填を行うにあたっては、中空柱体20の緩衝性能を確保するべく、中空部分29における緩衝材5の配置は、緩衝材の硬さや性能に応じて、適正な緩衝作用を発揮できるように、その配置の密度等を調節するとよい。例えば、間伐材や砕石や鋼管等の比較的硬いものを挿入するときには、その配置が粗となるよう配慮する。一方、発泡ウレタンや発泡スチロール等の材料自体に緩衝機能を有するものは密に充填、配置したほうが、緩衝作用をより有効に活用できる。   Further, the hollow portion 29 of the hollow column 20 can be inserted or filled with a wood 3 such as a thinning material or a cushioning material 5 such as urethane foam 4. As the buffer material 5, other wood chips, polystyrene foam, hard rubber, earth and sand, crushed stone, thin steel pipes and the like can be used. Each of them can exhibit an excellent buffering action by being inserted or filled in the hollow column. In performing this insertion or filling, the arrangement of the cushioning material 5 in the hollow portion 29 can exert an appropriate cushioning action according to the hardness and performance of the cushioning material in order to ensure the cushioning performance of the hollow columnar body 20. In addition, the density of the arrangement may be adjusted. For example, when a relatively hard material such as thinned wood, crushed stone, or steel pipe is inserted, consideration is given to the rough arrangement. On the other hand, if the material itself having a buffer function, such as urethane foam or polystyrene foam, is closely packed and arranged, the buffer action can be utilized more effectively.

このように、中空部分29における緩衝材5の施工を行うことで、受撃時における当該緩衝材5によるエネルギー吸収が期待できる一方で、中空柱体20が潰れることによるエネルギー吸収を期待しにくい代わりに、大きな変形を抑制することもできる。従って、落石防止柵100の設置現場が各種交通機関施設や住宅等に接近する場合にもそれらに影響を及ぼすことが少なくなり、施工範囲の自由度が高まることとなる。更には、間伐材などの有効利用を図ることにもつながる。   In this way, by performing the buffer material 5 in the hollow portion 29, energy absorption by the buffer material 5 at the time of impact can be expected, while energy absorption due to the collapse of the hollow column 20 is unlikely to be expected. In addition, large deformation can be suppressed. Therefore, even when the installation site of the rock fall prevention fence 100 approaches various transportation facilities, houses, etc., they are less affected and the degree of freedom of the construction range is increased. Furthermore, it leads to effective use of thinned wood.

−−−螺旋状の線材およびこの螺旋線材からなる網部材、並びに中空柱体−−−
図6は本実施形態における網部材を構成する螺旋材を示す俯瞰図であり、図7は本実施形態における網部材を構成する螺旋材の側面および断面を示す図である。次に、本実施形態における中空柱体20を構成する網部材25の成り立ちについて説明する。網部材25を構成すべく縦横に配置された線材21、22のうち、中空柱体20の鉛直方向に沿って配置される線材21を縦線、中空柱体20の円周方向に沿って配置される線材22を横線と想定する。但し、いずれの線材21、22も形状は同じである。
---- Spiral wire, net member made of this spiral wire, and hollow column ---
FIG. 6 is a bird's-eye view showing the spiral member constituting the mesh member in the present embodiment, and FIG. 7 is a view showing a side surface and a cross section of the spiral member constituting the mesh member in the present embodiment. Next, the formation of the net member 25 constituting the hollow column 20 in the present embodiment will be described. Among the wires 21 and 22 arranged vertically and horizontally to constitute the net member 25, the wires 21 arranged along the vertical direction of the hollow column 20 are arranged along the vertical line and the circumferential direction of the hollow column 20. The wire 22 to be used is assumed to be a horizontal line. However, the shape of both the wires 21 and 22 is the same.

図6に示す例では、縦線21、横線22ともに、螺旋形状の線材(螺旋線材)となっている。この螺旋線材50は、所定の直径からなる線材を、螺旋の外径53が上記線材の外径54の約2倍となるようにし、山部51及び谷部52とがほぼ相対する形状からなると共に、各谷部52が螺旋中心の外側(山部51側)に位置するように所定のリード及びピッチで螺旋状に巻回してなり、同一形状の山部51と谷部52とが軸線方向に相対して繰り返される螺旋状であり、かつ谷部52が螺旋中心軸A-Aに接する位置またはそれに近い位置に旋回する線材である。   In the example shown in FIG. 6, both the vertical line 21 and the horizontal line 22 are helical wires (spiral wires). The spiral wire 50 is made of a wire having a predetermined diameter such that the outer diameter 53 of the spiral is approximately twice the outer diameter 54 of the wire, and the peak portion 51 and the valley portion 52 are substantially opposed to each other. In addition, each of the valleys 52 is spirally wound with a predetermined lead and pitch so that each valley 52 is located outside the spiral center (on the peak 51 side), and the peaks 51 and valleys 52 having the same shape are axial. And a wire rod that revolves at a position where the valley portion 52 is in contact with or close to the spiral central axis AA.

このように、中心(つまり螺旋中心軸A-A)に空洞を持たない、いわゆる内径ゼロに近い螺旋線材は、図7に示すように、前記縦線21や横線22を相互の山部51および谷部52が係合するように組み合わせて網体を形成すると、相互に係合しあう山部51及び谷部52により位置ずれが規制されることとなる。これにより、図8に示すように、形状が安定した強靭な網部材25となり、ひいては形状を自己保持可能な中空柱体20をなすことができるのである。   In this way, the spiral wire rod having no hollow at the center (that is, the spiral central axis AA) and having a so-called zero inner diameter has the vertical line 21 and the horizontal line 22 connected to each other as shown in FIG. When the mesh body is formed by combining the valley portions 52 so as to engage with each other, the positional deviation is restricted by the mountain portions 51 and the valley portions 52 that are engaged with each other. As a result, as shown in FIG. 8, a strong net member 25 having a stable shape is obtained, and as a result, a hollow column 20 capable of self-holding the shape can be formed.

尚、このような螺旋線材は、特許文献3や特許文献4に記載されているような公知の方法によって製造できる。   In addition, such a spiral wire can be manufactured by a known method as described in Patent Document 3 and Patent Document 4.

前記網部材25で中空柱体20を構成する際には、上述した通り螺旋線材50同士を組み合わせることで螺旋線材50同士の係合作用を利用できるため、溶接等の処理を不要とできる。さらに、螺旋線材50で網部材25を構成しているので、網部材25として編んだ後でも、螺旋線材50を回転して前進または後退させるようにずらすことで、前記山部51と谷部52の係合が外れ、網部材25の分解、螺旋線材50の部分的交換や追加が容易にできる。   When the hollow column body 20 is constituted by the mesh member 25, the engagement action of the spiral wire members 50 can be used by combining the spiral wire members 50 as described above, so that a process such as welding can be omitted. Further, since the mesh member 25 is constituted by the spiral wire member 50, even after knitting as the mesh member 25, the peak portion 51 and the valley portion 52 can be obtained by rotating the spiral wire member 50 so as to move forward or backward. The mesh member 25 can be disassembled, and the spiral wire 50 can be partially replaced or added easily.

なお、前記網部材25を構成する線材21、22(螺旋線材50含む)は、金属製または合成樹脂製のいずれかであることが想定できる。金属としては、一般的な鋼製の線材を使用することができる。但し、強度や加工性および組立施工性の点から、例えば、加工性に優れた軟鋼からなる線材を用いることが好適である。また、線材直径が1〜5mm、螺旋の外径が線材直径の約2倍、螺旋ピッチが線材の5〜8倍のものが想定できる。更に、線材21、22としてメッキ鋼線やチタン、或いはその他耐食性の合金を用いることとすれば、耐候性や防食の点から耐久性を高めることが可能で、落石防止柵100自体の緩衝性能等の性能が経年変化しにくくなる。   In addition, it can be assumed that the wire rods 21 and 22 (including the spiral wire rod 50) constituting the mesh member 25 are made of metal or synthetic resin. As the metal, a general steel wire can be used. However, from the viewpoint of strength, workability, and assembly workability, for example, it is preferable to use a wire made of mild steel having excellent workability. Further, it can be assumed that the wire diameter is 1 to 5 mm, the outer diameter of the spiral is about twice the diameter of the wire, and the spiral pitch is 5 to 8 times that of the wire. Furthermore, if plated steel wires, titanium, or other corrosion-resistant alloys are used as the wires 21 and 22, durability can be enhanced in terms of weather resistance and corrosion prevention, and the buffer performance of the rock fall prevention fence 100 itself, etc. The performance of the is less likely to change over time.

本願発明者等の実験結果によれば、中心に空洞を持たない螺旋線材により構成される螺旋金網は、溶接金網や菱形金網などに比べて衝撃力を受けた時のエネルギー吸収能力が極めて高いことが確かめられている。   According to the results of experiments by the inventors of the present application, a spiral wire mesh composed of a spiral wire rod having no cavity in the center has an extremely high energy absorption capability when subjected to an impact force compared to a welded wire mesh or a diamond wire mesh. Has been confirmed.

以下に本願発明者等が行った実験について記述する。実験では、溶接金網、菱形金網、螺旋金網を約1m×1mずつ用意し、中央部に100kg・200kg・300kgの錘を2mの高さから落下させて衝撃吸収性能を調査した。菱形金網および溶接金網が素線径φ4mmで配置間隔が50mmの網材であり、螺旋金網は素線径φ4.5mmで配置間隔が77.5mmの網材について試験を行っており、螺旋金網の方が,単位面積当たりの鋼材料は若干少ない。評価指標として、錘の落下直後の反発(撥ね返り)における加速度を測定し、これが小さいほど衝撃吸収能力に優れると評価できる。   Hereinafter, experiments conducted by the inventors will be described. In the experiment, approximately 1 m × 1 m each of a welded wire mesh, a diamond wire mesh, and a spiral wire mesh were prepared, and a weight of 100 kg, 200 kg, and 300 kg was dropped from a height of 2 m on the center, and the impact absorption performance was investigated. A diamond wire mesh and a welded wire mesh are mesh members having a wire diameter of φ4 mm and an arrangement interval of 50 mm, and a spiral wire mesh is being tested on a mesh material having an element wire diameter of φ4.5 mm and an arrangement interval of 77.5 mm. However, the amount of steel material per unit area is slightly smaller. As an evaluation index, acceleration in rebound (repelling) immediately after falling of the weight is measured.

図11に、錘落下直後の撥ね返りにおける加速度を示す。溶接金網が最も加速度が高く、しかも200kgで錘が貫通(網が破損)した。菱形金網も溶接金網とほぼ同様で、200kgで錘が貫通(網が破損)した。一方で、螺旋金網は他の金網に比べてかなり加速度が小さく、300kgの錘においても錘が貫通(網が破損)することなく十分に持ちこたえることができた。   FIG. 11 shows the acceleration in the rebound immediately after dropping the weight. The weld metal mesh had the highest acceleration, and the weight penetrated (the mesh was broken) at 200 kg. The diamond wire mesh was almost the same as the welded wire mesh, and the weight penetrated (the mesh was broken) at 200 kg. On the other hand, the spiral wire mesh has a considerably smaller acceleration than other wire meshes, and even with a 300 kg weight, the weight could be sufficiently held without penetrating (breaking the mesh).

これは螺旋網の衝撃吸収能力が一般の網と比較して極めて高いことを示すものである。螺旋金網の衝撃吸収能力が極めて優れているのは、衝撃力を受けた際に、螺旋線材が伸びることで衝撃エネルギーを吸収するためであることが分っている。   This indicates that the shock absorbing capacity of the spiral net is extremely high compared to a general net. It has been found that the shock-absorbing ability of the spiral wire mesh is excellent because it absorbs the impact energy when the spiral wire is stretched when it receives an impact force.

また、図3に示すように、本実施形態の構造において中空柱体20は、円筒柱体に落石が衝突した際に、落石による力を受け止め、落石のエネルギーを吸収するため、横線22が円周方向に連続している必要がある。   In addition, as shown in FIG. 3, in the structure of the present embodiment, the hollow column 20 receives the force of the falling rock when the falling rock collides with the cylindrical column, and absorbs the energy of the falling rock. Must be continuous in the circumferential direction.

そのため、このような中空柱体20を製作する方法としては、1)円形に閉合された横線22を等間隔にて配置し、縦線21により横線を結合する方法や 2)横線22をスパイラル状に連続的に何重にも巻く様に配置した後、縦線21により横線22を結合する方法で製作可能である。   Therefore, as a method of manufacturing such a hollow column 20, 1) a method in which horizontal lines 22 closed in a circle are arranged at equal intervals, and horizontal lines 22 are joined by vertical lines 21. 2) the horizontal lines 22 are spiral. It can be manufactured by a method in which the horizontal lines 22 are joined by the vertical lines 21 after being arranged so as to be continuously wound.

このとき、先述のような中心に空洞を持たない、いわゆる内径ゼロに近い螺旋線材の縦線21と横線22の結合は、横線21及び縦線22の山部および谷部が係合するように組み合わせて行うが、この際、横線を等間隔に配置したのち、縦線をこれに上記の様に噛み合うように縦線を回転させながら前進させることにより係合させてゆく。   At this time, the vertical line 21 and the horizontal line 22 of the spiral wire rod having no hollow at the center as described above and having a so-called inner diameter of zero are connected so that the crests and troughs of the horizontal line 21 and the vertical line 22 are engaged. In this case, the horizontal lines are arranged at equal intervals, and then the vertical lines are engaged with each other by moving forward so that the vertical lines are engaged with each other as described above.

しかしながら、1)の方法では、横線22の1本1本を溶接等の方法で円形に接合する必要があり手間がかかり、また、1)、2)の方法共に、横線22を円筒状に成形しつつ、同時に1本1本の縦線を少しずつ回転および前進させながら縦線21と横線22との係合を行う必要があり、やはり大きな手間がかかるため、中空柱体20は下記の方法で製作することが好ましい。   However, in the method 1), it is necessary to join each of the horizontal lines 22 into a circular shape by a method such as welding, and it takes time. In both the methods 1) and 2), the horizontal line 22 is formed into a cylindrical shape. However, it is necessary to engage the vertical line 21 and the horizontal line 22 while rotating and advancing each vertical line little by little at the same time. It is preferable to manufacture with.

すなわち、螺旋線材による平板状の網体を製作した後、この平網を円筒状に丸めて、その平網の両端を突き合わせて結合する方法である。   That is, after a flat mesh body made of a spiral wire is manufactured, the flat mesh is rolled into a cylindrical shape, and both ends of the flat mesh are butted and joined.

図10(a)、(b)に接合部の構造を示す。両端の結合方法としては、先ずは、略長方形の平板状の網部材25における長手方向の両端部を、長手方向に所定の長さに渡って平板状の網部材25に対して略直角となるように折り曲げた後、この網部材25が中空部材20を形成するように、円筒状に丸めて、この両端部を突き合わせるようにする。この際、網部材25の折り曲げた側が中空部材20の中空部分29側となるようにすると、中空部材外側への突起形成を抑制でき、設置スペースの抑制、美観、安全性の面から好ましい。   FIGS. 10A and 10B show the structure of the joint. As a method of joining both ends, first, both end portions in the longitudinal direction of the substantially rectangular flat mesh member 25 are substantially perpendicular to the flat mesh member 25 over a predetermined length in the longitudinal direction. After being bent in this manner, the net member 25 is rounded into a cylindrical shape so that the hollow member 20 is formed, and both ends thereof are abutted. At this time, if the bent side of the net member 25 is the side of the hollow portion 29 of the hollow member 20, the formation of protrusions on the outer side of the hollow member can be suppressed, which is preferable from the viewpoint of installation space reduction, aesthetics, and safety.

次に、この突き合わせた両端部の網部材25を挟持金物60で挟み込んで固定する。この挟持金物60は、ボルト挿通孔を有する2種類の平鋼(61a、61b)1枚ずつと、断面がL字状でボルト挿通孔を有するアングル等のL字状部材62(2つ)とから構成される。   Next, the mesh members 25 at both end portions that are abutted are sandwiched and fixed by the sandwiching hardware 60. This clamping metal 60 includes two types of flat steel (61a, 61b) each having a bolt insertion hole, an L-shaped member 62 (two) such as an angle having an L-shaped cross section and a bolt insertion hole, and the like. Consists of

すなわち、突き合わせ部において中空部材の長手方向(高さ方向)に渡って、1)突き合わせられた網部材25の両端部の間に挟むように帯状の平鋼61aと、2)両端部の折り曲げられた側と反対側に平鋼61bを配置する。   That is, in the abutting portion, over the longitudinal direction (height direction) of the hollow member, 1) the strip-shaped flat steel 61a is sandwiched between both end portions of the abutted mesh member 25, and 2) the both end portions are bent. A flat bar 61b is disposed on the opposite side to the opposite side.

そして、断面がL字状のL字状部材62を、両端部の網部材25を平鋼61a及び平鋼61bとで挟むように、中空部材の長手方向(高さ方向)に渡って配置し、網部材25の縦線21と横線22を挟み込んだ状態で、平鋼61aと2つのL字状部材62を貫通するボルト65aとナット66aにて締結し、更に、平鋼61bと2つのL字状部材62とを、貫通するボルト65bとナット66bにて締結して、両端部を固定し、中空部材20を形成する。   Then, the L-shaped member 62 having an L-shaped cross section is arranged over the longitudinal direction (height direction) of the hollow member so that the net members 25 at both ends are sandwiched between the flat steel 61a and the flat steel 61b. In the state where the vertical line 21 and the horizontal line 22 of the mesh member 25 are sandwiched, the flat steel 61a and the two L-shaped members 62 are fastened with bolts 65a and nuts 66a, and further, the flat steel 61b and the two L The character-shaped member 62 is fastened by a bolt 65b and a nut 66b that pass therethrough, and both ends are fixed to form the hollow member 20.

このとき、平鋼61b上に存在する縦線21において、当該縦線21の少なくとも1本を前記ボルト65bよりも接合部側に配置すると、挟持金物60が網部材25をしっかりと挟み込みことができ、好ましい。(図10(b)では、2本の縦線21をボルト65bよりも接合部側に配置している。)
ボルト65a、及び、ボルト65bは、中空部材20の長手方向において、挟持金物60に、所定の間隔をあけて複数設けられる。
At this time, in the vertical line 21 existing on the flat steel 61b, when at least one of the vertical lines 21 is arranged on the joint side with respect to the bolt 65b, the holding metal 60 can firmly hold the net member 25. ,preferable. (In FIG.10 (b), the two vertical lines 21 are arrange | positioned rather than the volt | bolt 65b at the junction part side.)
A plurality of the bolts 65 a and 65 b are provided on the holding metal 60 with a predetermined interval in the longitudinal direction of the hollow member 20.

尚、図10(a)においては、平鋼61aと平鋼61bは分かれているが、平鋼61aと平鋼61bとが一体化したT字状の部材であっても構わない。   In FIG. 10 (a), the flat bar 61a and the flat bar 61b are separated, but a T-shaped member in which the flat bar 61a and the flat bar 61b are integrated may be used.

本結合方法を用いることで、中空部材20を形成する横線22に、周方向の力が作用するとき、この力は、ボルト65bの上部において、横線22と直角に交差する縦線21に伝わる。このとき、縦線21がボルト65bで係止されていることで固定側となり、横線22に作用する周方向の力が横線22を伸ばすと共に回転させるようになる。しかし、このとき横線22の先端の折り曲げ部が挟持部材60で挟持されていることで、横線22の回転が阻止される。これにより横線22が縦線21から引き抜かれるように下方に伸びる(移動する)不具合を解消できる。   By using this coupling method, when a circumferential force acts on the horizontal line 22 that forms the hollow member 20, this force is transmitted to the vertical line 21 that intersects the horizontal line 22 at a right angle in the upper portion of the bolt 65b. At this time, since the vertical line 21 is locked by the bolt 65b, it becomes the fixed side, and the circumferential force acting on the horizontal line 22 extends and rotates the horizontal line 22. However, at this time, the bent portion at the tip of the horizontal line 22 is clamped by the clamping member 60, so that the rotation of the horizontal line 22 is prevented. As a result, it is possible to solve the problem that the horizontal line 22 extends (moves) downward so as to be pulled out from the vertical line 21.

折り曲げ部の長さは、回転を拘束できるに十分な量であれば良く、折り曲げ長さとしては、螺旋線材の線径の3〜4倍以上が好ましい。   The length of the bent portion may be an amount sufficient to restrain rotation, and the bent length is preferably 3 to 4 times the wire diameter of the helical wire.

螺旋線材50による平板状の網部材25は、一定長さの横線22を所定の間隔に並べて配置した後、縦線21を、機織りを行う要領で挿入し(隣り合う横線22を、網部材25の鉛直方向において逆方向に押し広げる)、横線22に係合させて製作することができるため、極めて能率よく製造することができる。更に、上述した好ましい接合方法をとれば、横線を一本一本それぞれ接合する必要が無く、所定の間隔で配置したボルトにより挟持金物60を締め付けるだけで容易に円筒状の中空部材20を製作することができる。   The flat mesh member 25 made of the spiral wire 50 is arranged by arranging the horizontal lines 22 of a certain length at predetermined intervals, and then inserting the vertical lines 21 in the manner of weaving (the adjacent horizontal lines 22 are connected to the mesh member 25). Can be manufactured by being engaged with the horizontal line 22 and can be manufactured very efficiently. Furthermore, if the preferable joining method mentioned above is taken, it is not necessary to join each horizontal line one by one, and the cylindrical hollow member 20 can be easily manufactured only by tightening the clamping metal 60 with bolts arranged at a predetermined interval. be able to.

図12には、本実施形態における接合部の強度を実験により発明者等が調査した結果を示す。幅20cmで長さ100cmの網材の二つの試験片について、一方は中央に本実施形態による継手を設けたものと、もう一方は継手のない試験片の引張試験を行っている。網材は,線材径は3.2とし,配置ピッチは約14mmとしている.グラフでは、縦軸に荷重をとり、横軸に試験体の伸びをとり、試験体の荷重と伸びの関係を示しているが、実線が接合部のない試験体で、破線が該接合部を有する試験体である。グラフより、実線のグラフの最大値と破線のグラフの最大値はいずれも大きな差はなく、本接合構造が、接合部のない試験体の引張り強度とほとんど同等の強度を有することがわかる。   FIG. 12 shows the results of investigation by the inventors on the strength of the joint in this embodiment. For two test pieces of a net material having a width of 20 cm and a length of 100 cm, one is provided with a joint according to the present embodiment at the center, and the other is subjected to a tensile test of a test piece without a joint. The mesh material has a wire diameter of 3.2 and an arrangement pitch of about 14 mm. In the graph, the vertical axis represents the load, the horizontal axis represents the elongation of the test body, and the relationship between the load and elongation of the test body is shown, but the solid line is the test body without a joint, and the broken line represents the joint. It is a test body having. From the graph, it can be seen that there is no great difference between the maximum value of the solid line graph and the maximum value of the broken line graph, and this bonded structure has almost the same strength as the tensile strength of the specimen without the bonded portion.

−−−中空柱体の他の連結手法−−−
図9は本実施形態における中空柱体の連結手順例2を示す図である。ここでは、中空柱体20同士の他の連結方法として、前記重複した側端部26における前記網部材25に前記線材のうち縦方向の線材21を配置する手法を説明する。中空柱体20同士の連結にあたっては、前記法面11の横断方向において互いの側端部26が重複するよう配置する点は、図3の例と同様である。ここでは、前記重複した側端部26で囲まれる空間27に棒状材30を挿入することなく、連結用螺旋線材55を前記側端部26の網部材25に追加してゆく。
--- Other connection methods of hollow columns ---
FIG. 9 is a diagram showing a connection procedure example 2 of the hollow column bodies in the present embodiment. Here, as another connection method of the hollow column bodies 20, a method of arranging the vertical wire 21 among the wires on the mesh member 25 at the overlapping side end portion 26 will be described. In connecting the hollow column bodies 20 to each other, it is the same as the example of FIG. 3 in that the side end portions 26 are arranged so as to overlap each other in the transverse direction of the slope 11. Here, the connecting helical wire 55 is added to the net member 25 of the side end portion 26 without inserting the rod-shaped material 30 into the space 27 surrounded by the overlapping side end portion 26.

螺旋線材は、相互の山部51および谷部52が係合するように組み合わせることで、相互に係合しあう山部51及び谷部52により位置ずれが規制される特性を有している。一方で、螺旋線材を回転して前進させるようにずらすことで、網部材25への螺旋線材50の部分的追加が可能でもある。   The helical wire has a characteristic that positional deviation is regulated by the crest 51 and the trough 52 that are engaged with each other by combining the crest 51 and the trough 52 so as to engage with each other. On the other hand, the spiral wire 50 can be partially added to the mesh member 25 by shifting the spiral wire so that the spiral wire moves forward.

こうした螺旋線材50の特性を有する前記連結用螺旋線材55を、前記横線22のみで構成されている側端部26に対して、回転して前進させるようにずらすことで追加する。これにより、隣接する中空柱体20同士で互いに重複している側端部26が、前記連結用螺旋線材55の挿入でもって係合状態となる。これにより前記中空柱体20同士を互いに連結することとなる。したがって、溶接やボルト締結といった作業や特殊部材、特殊工具等を中空柱体20同士の連結に用いることがないため、簡便で施工性の良い施工が可能となる。   The connecting spiral wire 55 having the characteristics of the spiral wire 50 is added by being shifted so as to rotate and advance with respect to the side end portion 26 constituted only by the horizontal wire 22. Thereby, the side edge part 26 which mutually overlaps between the adjacent hollow columnar bodies 20 will be in an engagement state by insertion of the said helical wire 55 for a connection. Thereby, the hollow column bodies 20 are connected to each other. Therefore, work such as welding and bolt fastening, special members, special tools, and the like are not used to connect the hollow column bodies 20 to each other, so that simple and good workability can be achieved.

本発明によれば、鉄骨等の重量物に比較して比較的軽量で取扱容易な中空柱体を順次連結することで、落石防止柵を随意に延長することが可能であり、施工性や施工効率に優れる。また、中空柱体同士の連結にあたっても、溶接やボルト締結といった作業や特殊部材、特殊工具等を用いることがないため、簡便な施工が可能となる。   According to the present invention, it is possible to arbitrarily extend the rockfall prevention fence by sequentially connecting hollow columns that are relatively light and easy to handle compared to heavy objects such as steel frames. Excellent efficiency. In addition, since the work such as welding and bolt fastening, a special member, a special tool, and the like are not used when connecting the hollow column bodies, simple construction is possible.

また、本発明の落石防止柵は、受撃時に中空柱体が潰れることによるエネルギー吸収効果と、その後に網部材が伸びることによるエネルギー吸収効果とが発揮され、従来の落石防止柵に比して衝撃吸収性能が大いに優れる。また、前記網部材の線材として内径ゼロの螺旋材を用いることで、前記螺旋が伸びることによる大きなエネルギー吸収効果を更に奏する。加えて、前記螺旋の伸び等に伴って前記螺旋材のうち横方向に配置されたものが網部材の構造から抜け出す動きを示すことで、中空柱体として更に大きな変形を生じさせることができる。したがって、更なるエネルギー吸収効果を奏することとなる。   In addition, the rock fall prevention fence of the present invention exhibits the energy absorption effect due to the hollow column body being crushed at the time of impact, and the energy absorption effect due to the net member extending thereafter, compared to the conventional rock fall prevention fence. Excellent shock absorption performance. In addition, by using a spiral material having an inner diameter of zero as the wire member of the mesh member, a large energy absorption effect due to the extension of the spiral is further exhibited. In addition, when the spiral member is disposed in the lateral direction along with the extension of the spiral and the like, the movement of the mesh member moves out of the structure of the mesh member, so that the hollow column can be further deformed. Therefore, there will be a further energy absorption effect.

また、中空柱体の中空部に材木などの緩衝材を挿入または充填することで、受撃時における当該緩衝材によるエネルギー吸収が期待できる一方で、中空柱体が潰れることによるエネルギー吸収を期待しにくい代わりに、大きな変形を抑制することもできる。従って、落石防止柵の設置現場が各種交通機関施設や住宅等に接近する場合にもそれらに影響を及ぼすことが少なくなり、施工範囲の自由度が高まることとなる。   In addition, by inserting or filling a buffer material such as timber into the hollow part of the hollow column body, energy absorption by the buffer material at the time of impact can be expected, while energy absorption due to the collapse of the hollow column body is expected. Instead of being difficult, large deformation can also be suppressed. Therefore, even when the site where the rockfall prevention fence is installed approaches various transportation facilities, houses, etc., they are less affected and the degree of freedom of the construction range is increased.

したがって、良好な衝撃吸収性能を発揮すると共に、効率的かつ簡便な施工が可能となる。Accordingly, it is possible to perform an efficient and simple construction while exhibiting good shock absorbing performance.

以上、本発明の実施の形態について、その実施の形態に基づき具体的に説明したが、これに限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能である。As mentioned above, although embodiment of this invention was described concretely based on the embodiment, it is not limited to this and can be variously changed in the range which does not deviate from the summary.

本実施形態の落石防止柵における形態例1を示す側面図である。It is a side view which shows the example 1 in the rock fall prevention fence of this embodiment. 本実施形態の落石防止柵における形態例1を示す、(a)平面図および正面図、(b)他の例の平面図である。It is the (a) top view and front view which show the example 1 in the rock fall prevention fence of this embodiment, (b) The top view of another example. 本実施形態における中空柱体の連結手順を示す図である。It is a diagram illustrating a connection procedure of the hollow pillar body in the present embodiment. 本実施形態の落石防止柵における形態例2を示す側面図である。It is a side view which shows the example 2 in the rock fall prevention fence of this embodiment. 本実施形態の落石防止柵における形態例2を示す正面図である。It is a front view which shows the example 2 in the rock fall prevention fence of this embodiment. 本実施形態における網部材を構成する螺旋材を示す俯瞰図である。It is an overhead view which shows the spiral material which comprises the net | network member in this embodiment. 本実施形態における網部材を構成する螺旋材の側面および断面を示す図である。It is a figure which shows the side surface and cross section of the helical material which comprise the net | network member in this embodiment. 本実施形態の網部材における線材の組合せ状況を示す図である。It is a figure which shows the combination condition of the wire in the net | network member of this embodiment. 本実施形態における中空柱体の連結手順の参考例を示す図である。It is a figure which shows the reference example of the connection procedure of the hollow column body in this embodiment. (a)本実施形態における中空部材の結合部の一例を示した断面図であり、(b)(a)のA−A断面を示した図である。(A) It is sectional drawing which showed an example of the coupling | bond part of the hollow member in this embodiment, (b) It is the figure which showed the AA cross section of (a). 金網の種類による衝撃吸収能力の違いを示した図である。It is the figure which showed the difference in the shock absorption capability by the kind of wire mesh. 本実施形態における接合部の有無による強度の差異を示す図である。It is a figure which shows the difference in the intensity | strength by the presence or absence of the junction part in this embodiment.

符号の説明Explanation of symbols

3 木材 4 発泡ウレタン
5 緩衝材 10 地山
11 法面 12 法尻
13 路盤 14 コンクリート基礎
15 支持部材 16 フランジ材
17 ボルト・ナット 20 中空柱体
21 縦線 22 横線
25 網部材 26 側端部
27 側端部で囲まれる空間 28 補助中空柱体
29 中空部分 30 棒状材
31 補助棒状材 40 ボルト・ナット
50 螺旋線材 51 山部
52 谷部 53 螺旋の外径
54 線材の外径 55 連結用螺旋線材
60 挟持部材 61a 平鋼
61b 平鋼 62 L字状部材
65a、65b ボルト 66a、66b ナット
100 落石防止柵
DESCRIPTION OF SYMBOLS 3 Wood 4 Urethane foam 5 Buffer material 10 Ground 11 11 Slope 12 Method bottom 13 Subbase 14 Concrete foundation 15 Support member 16 Flange material 17 Bolt and nut 20 Hollow column 21 Vertical line 22 Horizontal line 25 Net member 26 Side end 27 side Space surrounded by end portion 28 Auxiliary hollow column 29 Hollow portion 30 Bar-shaped material 31 Auxiliary rod-shaped material 40 Bolt / nut 50 Spiral wire 51 Mountain portion 52 Valley portion 53 Spiral outer diameter 54 Wire outer diameter 55 Connecting spiral wire 60 Clamping member 61a Flat steel 61b Flat steel 62 L-shaped members 65a, 65b Bolts 66a, 66b Nut 100 Falling rock prevention fence

Claims (9)

落石を受け止めるための落石防止柵であって、
螺旋の外径が線材の直径の約2倍である螺旋状に成形された線材を縦横に組み合わせた網部材にて構成され形状の自己保持が可能な中空柱体であり、当該中空柱体の側端部を構成する網部位は、縦方向の線材を配置しない構成である中空柱体を、延長方向において互いの側端部が重複するよう複数配置し、前記重複した側端部で囲まれる空間に棒状部材を挿入して前記中空柱体同士を互いに連結してなることを特徴とする落石防止柵
A rockfall prevention fence to catch rockfalls,
A hollow column body configured by a mesh member in which a spirally formed wire rod whose outer diameter is approximately twice the diameter of the wire rod is combined vertically and laterally and capable of self-holding the shape . The net portion constituting the side end portion is arranged with a plurality of hollow columns having a configuration in which no longitudinal wire is arranged so that the side end portions overlap each other in the extending direction, and is surrounded by the overlapped side end portions. A rock fall prevention fence characterized by inserting a rod-shaped member into a space and connecting the hollow columns to each other.
請求項1において、
前記網部材の線材が、鋼製または合成樹脂製のいずれかであることを特徴とする落石防止柵。
Oite to claim 1,
A rock fall prevention fence, wherein the wire of the mesh member is made of steel or synthetic resin.
請求項1又は2において、
前記中空柱体の水平断面が、円形、楕円形、多角形、隅部がR加工された多角形のいずれかであることを特徴とする落石防止柵。
In claim 1 or 2 ,
A falling rock prevention fence characterized in that the horizontal cross section of the hollow column body is any one of a circle, an ellipse, a polygon, and a polygon with corners processed to R.
請求項1〜のいずれかにおいて、
前記中空柱体の中空部分に緩衝材を挿入又は充填したことを特徴とする落石防止柵。
In any one of Claims 1-3 ,
A rock fall prevention fence, wherein a cushioning material is inserted or filled in a hollow portion of the hollow column body.
請求項において、
前記緩衝材が、木材、木材チップ、発泡スチロール、発泡ウレタン、硬質ゴム、土砂、砕石、薄肉鋼管の少なくともいずれかからなることを特徴とする落石防止柵。
In claim 4 ,
A rock fall prevention fence, wherein the cushioning material is made of at least one of wood, wood chips, polystyrene foam, urethane foam, hard rubber, earth and sand, crushed stone, and thin steel pipe.
落石を受け止めるための落石防止柵を備えた構造物であって、
螺旋の外径が線材の直径の約2倍である螺旋状に成形された線材を縦横に組み合わせた網部材にて構成され形状の自己保持が可能な中空柱体であり、当該中空柱体の側端部を構成する網部位は、縦方向の線材を配置しない構成である中空柱体を、延長方向において互いの側端部が重複するよう複数配置し、前記重複した側端部で囲まれる空間に棒状部材を挿入して前記中空柱体同士を互いに連結してなる落石防止柵を備えた構造物。
A structure with a rockfall prevention fence to catch rockfalls,
A hollow column body configured by a mesh member in which a spirally formed wire rod whose outer diameter is approximately twice the diameter of the wire rod is combined vertically and laterally and capable of self-holding the shape . The net portion constituting the side end portion is arranged with a plurality of hollow columns having a configuration in which no longitudinal wire is arranged so that the side end portions overlap each other in the extending direction, and is surrounded by the overlapped side end portions. A structure provided with a rock fall prevention fence formed by inserting rod-shaped members into a space and connecting the hollow pillars to each other.
落石を受け止めるための落石防止柵の施工方法であって、
螺旋の外径が線材の直径の約2倍である螺旋状に成形された線材を縦横に組み合わせた網部材にて構成され形状の自己保持が可能な中空柱体であり、当該中空柱体の側端部を構成する網部位は、縦方向の線材を配置しない構成である中空柱体を、延長方向において互いの側端部が重複するよう複数配置し、前記重複した側端部で囲まれる空間に棒状部材を挿入して前記中空柱体同士を互いに連結することを特徴とする落石防止柵の施工方法。
A method for constructing a rockfall prevention fence to catch rockfalls,
A hollow column body configured by a mesh member in which a spirally formed wire rod whose outer diameter is approximately twice the diameter of the wire rod is combined vertically and laterally and capable of self-holding the shape . The net portion constituting the side end portion is arranged with a plurality of hollow columns having a configuration in which no longitudinal wire is arranged so that the side end portions overlap each other in the extending direction, and is surrounded by the overlapped side end portions. A construction method for a rock fall prevention fence, wherein a rod-shaped member is inserted into a space to connect the hollow pillars to each other.
落石を受け止めるための落石防止柵であって、線材を縦横に組み合わせた網部材にて構成され形状の自己保持が可能な中空柱体を、延長方向において互いの側端部が重複するよう複数配置し、前記重複した側端部で囲まれる空間に棒状材を挿入して前記中空柱体同士を互いに連結してなる落石防止柵に使用する前記中空柱体の製造方法において、略長方形の平板状の網部材における長手方向の両端部を、長手方向に所定の長さに渡って前記平板状の網部材に対して略直角となるように折り曲げた後、前記網部材が中空柱体を形成するように円筒状に丸めて両端部を突き合わせ、当該両端部を中空柱体の長さ方向に渡って挟持金物でボルト接合することを特徴とする中空柱体の製造方法。 A rockfall prevention fence for catching rockfalls, which is composed of a mesh member made of a combination of vertical and horizontal wires, and a plurality of hollow pillars that can be self-holding in shape so that their side edges overlap in the extension direction. and, in the manufacturing method of the hollow columnar body to be used for rock fall prevention fence that by inserting a rod-like member in a space surrounded by the overlapping side edge portions formed by connecting together the hollow pillar bodies, substantially rectangular flat plate The both ends of the mesh member in the longitudinal direction are bent so as to be substantially perpendicular to the plate-like mesh member over a predetermined length in the longitudinal direction, and then the mesh member forms a hollow column. A method for producing a hollow column body comprising: rounding into a cylindrical shape, butting both end portions together, and bolting the both end portions with a clamping metal over the length direction of the hollow column body. 前記挟持金物は、断面がL字状でボルト挿通孔を有する2つのL字状部材と、ボルト挿通孔を有する平鋼A及び平鋼Bとからなり、前記両端部において、前記突き合わせられた網部材の間に平鋼Aを挟み、前記略直角に折り曲げられた網部材の形状に合せて前記2つのL字状部材を前記両端部にそれぞれ設置し、前記平鋼Aと前記2つのL字状部材とで前記突き合わせられた網部材をボルト接合し、更に、前記平鋼Bを前記略直角に折り曲げられた側と反対側の前記中空柱体に設置して、前記2つのL字状部材とで前記網部材を挟んでボルト接合することを特徴とする請求項記載の中空柱体の製造方法。 The clamping metal is composed of two L-shaped members having a L-shaped cross section and having bolt insertion holes, and flat steel A and flat steel B having bolt insertion holes, and the butted nets at the both ends. The flat steel A is sandwiched between the members, and the two L-shaped members are installed at the both ends in accordance with the shape of the net member bent at a substantially right angle, and the flat steel A and the two L-shaped members are installed. The mesh members that are abutted with each other by bolts, and the flat steel B is installed on the hollow column body on the opposite side to the side bent substantially at a right angle, and the two L-shaped members 9. The method for manufacturing a hollow column body according to claim 8 , wherein the bolt is joined with the mesh member interposed therebetween.
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