JP4026675B2 - Support structure for avalanche and rock fall protection body - Google Patents

Support structure for avalanche and rock fall protection body Download PDF

Info

Publication number
JP4026675B2
JP4026675B2 JP06748298A JP6748298A JP4026675B2 JP 4026675 B2 JP4026675 B2 JP 4026675B2 JP 06748298 A JP06748298 A JP 06748298A JP 6748298 A JP6748298 A JP 6748298A JP 4026675 B2 JP4026675 B2 JP 4026675B2
Authority
JP
Japan
Prior art keywords
support
foundation
avalanche
column
concrete
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP06748298A
Other languages
Japanese (ja)
Other versions
JPH11264117A (en
Inventor
佐智夫 中村
Original Assignee
日本サミコン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本サミコン株式会社 filed Critical 日本サミコン株式会社
Priority to JP06748298A priority Critical patent/JP4026675B2/en
Publication of JPH11264117A publication Critical patent/JPH11264117A/en
Application granted granted Critical
Publication of JP4026675B2 publication Critical patent/JP4026675B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、雪崩・落石の防護柵、防護網、防護壁などにおける雪崩・落石防護柵の支柱取付構造に関する。
【0002】
【発明が解決しようとする課題】
従来、この種のものとして、コンクリート基礎上に複数の支柱を等間隔に立設し、この支柱間に網体を張設し、前記複数立設した支柱の両端の支柱にガードロープの端末を定着して張設した雪崩・落石防護柵があり、実開昭56−77516号公報などに知られているように、斜面の裾部に打設したコンクリート製の基礎上にH形鋼などからなる多数の高尺の支柱及び低尺な支柱を立設(公報マイクロフィルム第4頁)し、それら支柱の下部は前記コンクリート製基礎に埋設されている(公報第3図)。
【0003】
図10はコンクリート基礎101に支柱102の下部を固定した断面図であり、このような支柱102を備えた防護柵が落石を受けると、支柱102の変形により落石エネルギーの吸収が行われ、この変形した支柱102を交換するには、コンクリート製の基礎101をはつり、支柱102を取り外した後、新しい支柱102の下部をコンクリートにより基礎101に固定しなければならず、変形した支柱101の交換作業に労力を要するという問題がある。
【0004】
また、図10に示すように、矢印Rで示す正面S側からの落石により、支柱101を曲げる力が加わると、支柱101の下部がコンクリート基礎101により拘束されているため、基礎101の上面に拘束された支柱102の背面箇所102Hに局部的な応力が発生し、支柱102の全周が変形する前に前記背面箇所102Hが局部座屈してしまうため、エネルギー吸収効率に劣る面がある。
【0005】
そこで、本発明は、支柱の交換作業が容易な雪崩・落石防護体の支柱取付構造を提供することを目的とし、また、支柱の変形によるエネルギー吸収効率に優れた雪崩・落石防護体の支柱取付構造を提供することを目的とする。
【0006】
【課題を解決するための手段】
請求項の発明は、支柱をコンクリート製の基礎に取付けた雪崩・落石防護体の支柱取付構造において、前記基礎の支柱用取付孔に前記支柱の下部を取付け、前記取付孔の上部は、少なくとも支柱の背面側が上方に向かって拡大形成されているものである。
【0007】
この請求項の構成によれば、支柱が曲る際、取付孔の上部は上方に向かって拡大形成されているため、支柱に局部的な座屈が発生することなく、変形によるエネルギー吸収効率が向上する。
【0008】
請求項の発明は、支柱をコンクリート製の基礎に取付ける雪崩・落石防護体の支柱取付構造において、前記基礎の支柱用取付孔に前記基礎より硬質な筒体を設け、この筒体に前記支柱の下部を着脱可能に挿着し、前記筒体の上部は、少なくとも支柱の背面側が上方に向かって拡大形成されているものである。
【0009】
この請求項の構成によれば、支柱が曲るなどして変形したら、取付孔から支柱の下部を抜き取り、新しい支柱の下部を取付孔に挿着して交換を行う。そして、コンクリートより硬質な筒体は、コンクリートにより拘束されているから、支柱が曲っても変形が防止され、新しい支柱をスムーズに挿着することができる。また、支柱が曲る際、取付孔の上部は上方に向かって拡大形成されているため、支柱に局部的な座屈が発生することなく、変形によるエネルギー吸収効率が向上する。
【0010】
【発明の実施態様】
以下、本発明の参考例を添付図面を参照して説明する。図1ないし図7は本発明の第1実施例を示し、衝撃吸収柵である雪崩・落石防護柵は、斜面あるいは斜面に沿う道路に並んでコンクリート製の基礎1を設け、このコンクリート製の基礎1に複数の支柱2,2Aを左右方向等間隔に立設する。尚、図1においては図中左側から支柱2,2A,2と並んで図示しているが、さらにその左側には支柱2A,2,2A・・・2と連続するものである。前記支柱2,2Aは、中空な鋼管などからなり、その下端を前記基礎1に取付け、また、前記支柱2には、図2及び図3に示す定着部3を設け、この定着部3は、その支柱2に複数段例えば5段に設けられている。前記定着部3は、左右方向に長い断面略コ字型のベース枠4を形成し、このベース枠4の左右両端前面に鍔板部5,5を一体に設け、この鍔板部5には孔6が形成されている。また、左右一側方向及び他側方向のガードロープ7,8の一端部7A,8Aにはれぞれ一端部を構成する索端金具9が固着され、この索端金具9の端部には雄螺子棒9Aが設けられ、この雄螺子棒9Aを前記鍔板部5の孔6に挿通すると共に該雄螺子棒9Aにナット9Bを螺合してその一側及び他側方向のガードロープ7,8の一端部7A,8Aを前記定着部3に定着している。前記ベース枠4の後面には、左右対をなす金属製の取付腕10,10が溶着によって一体に設けられ、これら取付腕10,10の基端に形成した係合溝10A,10Aに、前記支柱2の前板部12を挿入配置した状態で、ボルト等の取付部材11により前記定着部3が支柱2に着脱可能に固定される。尚、図中13は定着部3の前面を覆うカバーである。また、図1における左端の支柱2は落石防護柵の端末の支柱となり、その左端の支柱2にも端末の定着部として前記定着部3が設けられ、この定着部3には他側方向のガードロープ8の一端部8Aのみが索端金具9を介して定着され、また、図1においては図示しない落石防護柵の右端の支柱においては、前記定着部3に一側方向のガードロープ7の一端部7Aのみが索端金具9を介して定着される。
【0011】
前記定着部3,3間に位置する支柱2Aには、図4及び図5に示す断面略コ字形のベース枠21が、複数段例えば5段に設けられている。前記ベース枠21の後面には、対をなす前記取付腕10,10が溶着により一体に設けられ、これら取付腕10,10の基端に形成した係合溝10A,10Aに、前記支柱2の前板部12を挿入配置した状態で、ボルトの取付部材11等により前記ベース枠21が支柱2に固定される。前記ベース枠21の両端側には、それぞれ締付部材22,22が着脱自在に設けられ、この締付部材22は、Uボルト23に止板24を介してナット25を螺合するものを使用しており、そのベース枠21の両端側に形成した孔26に前記Uボルト23の両端を挿通し、後面にて前記ナット25が螺合される。さらに、前記定着部3により一端部7A,8Aを定着した一側及び他側方向のガードロープ7,8は、隣合う定着部3,3間に位置する前記ベース枠21位置において、その先端部7B,8B相互を重ね合わせて重複部27を形成し、この重複部27を前記ベース枠21に設けられる締付部材22,22とこれら締付部材22,22間に位置して間隔Hをおいて配置される締付部材22,22とによって所定の締付力により緊結している。また、前記締付部材22,22から一側方向及び他側方向に延設されたガードロープ7,8の先端にはそれぞれ端末突部28,29が固着されている。尚、図中13Aはベース枠21の前面を覆うカバーである。また、図6に示すように、前記ガードロープ7,8は複数の鋼製素線を撚り合わせて子なわ30を形成し、さらに複数の子なわ30を撚り合わせたものが使用され、該ガードロープ7,8の外周に位置する子なわ30はスパイラル状をなし、その外周の子なわ30がガイドロープの断面における一側位置から360度スパイラル状に撚り合わされて再び前記断面一側位置までに達する撚り線ピッチPと前記間隔Hとを等しくしている。31は複数のガードロープ7,8に取付けられ、該ガードロープ7,8の間隔を保持する板材等からなる間隔保持材である。また、前記支柱2,2A間には、上下のロープ材32を介して金網等からなる網体33が張設され、この網体33はクリップや針金やバンドワイヤなどの取付具(図示せず)によって前記ガードロープ7,8の前面に取付られている。
【0012】
また、この衝撃吸収柵においては、前記ガードロープ7,8、ベース枠21、取付腕10及び複数の締付部材22を工場で一体に組み立てたガードロープユニットUを用いており、このガードロープユニットUでは工場にて予めガードロープ7,8の先端部7B,8B相互を重ね合わせて重複部27を形成し、この重複部27をベース枠21に設けられる締付部材22,22とこれら締付部材22,22間に位置して間隔Hをおいて配置される締付部材22,22とによって所定の締付力により緊結し、さらにベース枠21の後面には取付腕10を工場にて溶接等により固定しておき、かつそのガードロープ7,8の一端部7A,8Aにぞれぞれ索端金具9を固着する。
【0013】
そして、現場において支柱2に定着部3をそれぞれ固定した後、支柱2,2間においてガードロープユニットUを取付け、この場合、取付腕10の係合溝10Aを支柱2Aの前板部12に合わせ、該支柱2Aの上方から挿入配置し、所定の高さでベース枠21をボルト11あるいは溶着にて固定する。この後ガードロープユニットUの両端に位置するガードロープ7,8の一端部7A,8Aを対応する定着部3にそれぞれ定着する。そして両端の雄螺子棒9Aを孔6に挿通し、その挿通した先端にナット9Bを螺合することにより、ガードロープ7,8の一端部7A,8Aを簡便に定着することができる。このようにして所定箇所にそれぞれガードロープユニットUを取付けた後、網体33を取付ける。そして網体33に落石等により衝撃力が加わると、ガードロープ7,8に引張力が働き、その引張力が所定以上、すなわち締付部材22による限界静止摩擦抵抗を越えると、ガードロープ7,8の一端部7B,8B相互が摩擦摺動し、この摩擦による相当量のエネルギー損失が生じることにより、前記衝撃力を吸収する。また、同時に一端部7B,8Bと締付部材22との摩擦摺動によっても、前記衝撃力が吸収される。そして衝撃力を重複部27の摩擦摺動により吸収した後、これを復旧する場合は、締付部材22を緩めて重複部27を形成し、締付部材22を所定の締付力により緊結するだけで復旧することができる。さらに、落石等の衝撃力が大で、重複部27が摩擦摺動して端末突部28,29が締付部材22に係止した後、さらにガードロープ7,8に引張力が加わって該ガードロープ7,8が塑性変形により伸びたり切断してしまった場合は、その伸びあるいは切断した部分の位置する定着部3,3間のガードロープ7,8をガードロープユニットUごと交換して補修することができる。そしてガードロープ7,8が塑性変形すなわち伸びる場合にあっては、そのガードロープ7,8の引張応力により衝撃力を吸収することができ、この場合重複部27が摺動して端末突部28,29が締付部材22に係止するまでに移動した分だけ支柱2,2間のガードロープ7,8の有効長さが長くなるため、従来の支柱間の長さしかないガードロープに比べて衝撃力吸収能力が高められる。さらに衝撃力により重複部27が摺動して端末突部28,29が締付部材22に係止した後は、支柱2,2Aが変形することにより、さらに該衝撃力を吸収する。
【0014】
次に、前記落石防護柵の支柱取付構造につき、図1及び図7を参照して説明すると、前記基礎1には、支柱用取付孔51を形成し、この支柱用取付孔51の内面には、前記支柱2,2Aの下部が挿脱自在な内筒52が設けられ、この内筒52の下部に底部53が一体に設けられており、前記内筒52及び底部53は、鋼鉄、鋳鉄、ステンレス、高強度コンクリートなどの前記基礎1より硬質な材料から形成されている。そして、前記内筒52に支柱2,2Aを挿入して基礎1に取り付けている。
【0015】
このようにして基礎1に支柱2,2Aを取付けた落石防護柵にあっては、上述したように落石などの衝撃力が加わり、あるいは支柱2,2Aに落石が衝突するなどして、支柱2,2Aが曲った場合、曲った支柱2,2Aのみを引き抜き、新しい支柱2,2Aの下部を支柱用取付孔51に挿入して取付ける。また、この例では、定着部3が支柱2,2Aに取付部材11により着脱可能に設けられているから、交換した支柱2,2Aに定着部3を取付けることができる。さらに、前記支柱用取付孔51の内周には、コンクリートより硬質な内筒52が設けられ、この内筒52の回りが基礎1のコンクリートにより拘束されているから、支柱2,2Aが曲っても、取付孔51の内筒52の変形を防止でき、内筒52が変形しないから、支柱2,2Aの交換をスムーズに行うことができる。
【0016】
このように本参考例では、支柱2,2Aをコンクリート製の基礎1に取付ける雪崩・落石防護体の支柱取付構造において、基礎1の支柱用取付孔51に基礎1より硬質な筒体52を設け、この筒体52に支柱2,2Aの下部を着脱可能に挿着したものであるから、支柱2,2Aが曲るなどして変形したら、取付孔51から支柱2,2Aの下部を抜き取り、新しい支柱2,2Aの下部を取付孔51に挿着して交換を行うことができ、しかも、コンクリートより硬質な筒体52がコンクリートにより拘束されているから、支柱2,2Aが曲っても筒体の変形は防止されると共に、取付孔51の回りのコンクリートの損傷も防止でき、新しい支柱2,2Aをスムーズに挿着することができる。
【0017】
図8は本発明の第実施例を示し、上記参考例と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、この例では、内筒52の上部に上方に向って彎曲状に拡大する拡大部52Aを形成している。すなわち拡大部52Aはラッパ状の形状をなす。
【0018】
そして、この例でも支柱2,2Aを基礎1に挿脱して取付けることができる。また、矢印Rで示す正面方向からの落石などにより支柱2,2Aが曲る場合でも、支柱2,2Aが基礎1の上面で折れ曲るようにして変形することなく、支柱2,2Aの正面S側は引張力により変形し、背面H側は圧縮力により変形し、支柱2,2A全体が曲るようにして変形するため、該変形により落石のエネルギーを効率良く吸収することができる。このように、正面S側からの落石により支柱2,2Aは背面H側に倒れるように曲るから、前記拡大部52Aは、少なくとも背面H側が拡大していればよい。
【0019】
このように本実施例では、請求項に対応して、支柱2,2Aをコンクリート製の基礎1に取付けた雪崩・落石防護体の支柱取付構造において、基礎1の支柱用取付孔51に支柱2,2の下部を取付け、取付孔51の上部は、支柱2,2Aの背面H側が上方に向かって拡大形成されているから、支柱2,2Aが曲る際、取付孔51の上部は上方に向かって拡大形成されているため、支柱2,2Aの背面H側に局部的な座屈が発生することなく、変形によるエネルギー吸収効率を向上することができる。また、取付孔51の上部が拡大形成されていることにより、前記拡大部52Aが案内となり、支柱2,2Aの下部をスムーズに挿入することができる。
【0020】
また、このように本実施例では、請求項に対応して、支柱2,2Aをコンクリート製の基礎1に取付ける雪崩・落石防護体の支柱取付構造において、基礎1の支柱用取付孔51に基礎1より硬質な筒体52を設け、この筒体52に支柱2,2Aの下部を着脱可能に挿着したものであり、筒体52の上部は、少なくとも支柱2,2Aの背面H側が上方に向かって拡大形成されているから、支柱2,2Aが曲るなどして変形したら、取付孔51から支柱2,2Aの下部を抜き取り、新しい支柱2,2Aの下部を取付孔51に挿着して交換を行うことができ、しかも、コンクリートより硬質な筒体52は、コンクリートにより拘束されているから、支柱2,2Aが曲っても変形が防止され、新しい支柱2,2Aをスムーズに挿着することができる。また、支柱2,2Aが曲る際、取付孔51の上部は上方に向かって拡大形成されているため、支柱2,2Aの背面H側に局部的な座屈が発生することなく、変形によるエネルギー吸収効率が向上する。
【0021】
また、実施例上の効果として、拡大部52Aは上方に向って彎曲状に拡大する形状であるから、支柱2,2Aの背面H側における座屈を軽減することができる。
【0022】
図9は本発明の第実施例を示し、上記参考例及び実施例と同一部分に同一符号を付し、その詳細な説明を省略して詳述すると、この例は雪崩・落石防護壁を示し、法面61に前記基礎1が設けられ、この基礎1に前記支柱用取付孔51が設けられ、この支柱取付孔51に中空な鋼管などからなる支柱62が、その下部を挿入して取付けられ、複数の支柱62の正面S側には、複数の横梁63が架設されている。また、同図に示すように、筒体52には、背面H側に拡大部52Aが形成されている。
【0023】
このように本実施例でも、支柱61の下部を基礎1に着脱自在に挿着し、内筒52は拡大部52Aを有するから、請求項1〜に対応して、上記第1実施例と同様な作用,効果を奏する。
【0024】
尚、本発明は前記実施例に限定されるものではなく、本発明の要旨の範囲内において種々の変形実施が可能であり、例えば、実施例では、円筒状の支柱を示したが、角筒状でもよく、また、支柱の内部にコンクリートなどの充填材を充填することもでき、さらには、支柱は中実なものでもよい。また、支柱の材料は適宜選定可能であり、内筒は支柱より硬質なものが、支柱を繰り返し交換するには好ましいが、内筒の外側がコンクリートにより拘束されているから、必ずしも内筒は支柱より硬質である必要はなく、基礎のコンクリートより硬質なものであれば、材質は適宜選定可能である。また、拡大部は必ずしも彎曲状でなくてもよい。
【0025】
【発明の効果】
請求項の発明は、支柱をコンクリート製の基礎に取付けた雪崩・落石防護体の支柱取付構造において、前記基礎の支柱用取付孔に前記支柱の下部を取付け、前記取付孔の上部は、少なくとも支柱の背面側が上方に向かって拡大形成されているものであり、支柱の変形によるエネルギー吸収効率に優れた雪崩・落石防護体の支柱取付構造を提供することができる。
【0026】
求項の発明は、支柱をコンクリート製の基礎に取付ける雪崩・落石防護体の支柱取付構造において、前記基礎の支柱用取付孔に前記基礎より硬質な筒体を設け、この筒体に前記支柱の下部を着脱可能に挿着し、前記筒体の上部は、少なくとも支柱の背面側が上方に向かって拡大形成されているものであり、支柱の交換作業が容易で、支柱の変形によるエネルギー吸収効率に優れた雪崩・落石防護体の支柱取付構造を提供することができる。
【図面の簡単な説明】
【図1】本発明の参考例を示す断面図である。
【図2】本発明の参考例を示す定着部の正面側の断面図ある。
【図3】本発明の参考例を示す定着部の側面側の断面図である。
【図4】本発明の参考例を示す重複部の平断面図である。
【図5】本発明の参考例を示す重複部の側面側の断面図である。
【図6】本発明の参考例を示すガードロープの斜視図である。
【図7】本発明の参考例を示す支柱取付構造の断面図である。
【図8】本発明の第実施例を示す支柱取付構造の断面図である。
【図9】本発明の第実施例を示す防護壁の支柱取付構造の断面図である。
【図10】従来例の支柱取付構造の断面図である。
【符号の説明】
1 基礎
2,2A 支柱
51 支柱用取付孔
52 筒体
52A 拡大部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for avalanche / falling rock protection fences in an avalanche / falling rock protection fence, a protection net, a protective wall and the like.
[0002]
[Problems to be solved by the invention]
Conventionally, as this type, a plurality of support columns are set up on a concrete foundation at equal intervals, a net is stretched between the support columns, and guard rope ends are attached to the support columns at both ends of the plurality of support columns. There is an avalanche / falling rock protection fence that has been established and stretched, and as is known in Japanese Utility Model Publication No. 56-77516, etc., it is made of H-shaped steel on a concrete foundation cast at the bottom of the slope. A large number of high pillars and low pillars are erected (publication microfilm, page 4), and the lower parts of these pillars are embedded in the concrete foundation (publication FIG. 3).
[0003]
FIG. 10 is a cross-sectional view in which the lower part of the support column 102 is fixed to the concrete foundation 101. When a guard fence having such a support column 102 receives a falling rock, the falling rock energy is absorbed by the deformation of the support column 102. To replace the post 102, the concrete base 101 must be suspended, the post 102 must be removed, and the lower part of the new post 102 must be fixed to the base 101 with concrete. There is a problem that labor is required.
[0004]
Further, as shown in FIG. 10, when a force for bending the support column 101 is applied by the falling rock from the front S side indicated by the arrow R, the lower portion of the support column 101 is restrained by the concrete foundation 101, so Since local stress is generated in the back portion 102H of the constrained support column 102 and the back surface portion 102H is locally buckled before the entire circumference of the support column 102 is deformed, there is a surface inferior in energy absorption efficiency.
[0005]
Accordingly, the present invention aims to provide a support structure for an avalanche / falling rock protector that allows easy replacement of the support, and also supports the avalanche / falling rock protector that has excellent energy absorption efficiency due to deformation of the support. The purpose is to provide a structure.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, in the support structure for an avalanche / falling rock protection body in which the support is attached to a concrete foundation, the lower part of the support is attached to the support hole for the support of the foundation, and the upper part of the attachment hole is at least The back side of the column is enlarged and formed upward.
[0007]
According to the first aspect of the present invention, when the support column is bent, the upper portion of the mounting hole is enlarged upward, so that the energy absorption efficiency due to deformation does not occur without causing local buckling of the support column. Will improve.
[0008]
According to a second aspect of the present invention, in the support structure for an avalanche / falling rock protector for attaching a support to a concrete foundation, a cylinder harder than the foundation is provided in the support hole for the support of the foundation, and the support is attached to the cylinder. The upper part of the cylindrical body is formed such that at least the back side of the column is enlarged upward.
[0009]
According to the second aspect of the present invention, when the support column is bent and deformed, the lower portion of the support column is removed from the mounting hole, and the lower portion of the new support column is inserted into the mounting hole for replacement. And since the cylinder harder than concrete is restrained by concrete, even if a support | pillar bends, a deformation | transformation is prevented and a new support | pillar can be inserted smoothly. Further, when the support column is bent, the upper portion of the attachment hole is formed to expand upward, so that the energy absorption efficiency by deformation is improved without causing local buckling of the support column.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, reference examples of the present invention will be described with reference to the accompanying drawings. FIGS. 1 to 7 show a first embodiment of the present invention. An avalanche / falling rock protection fence, which is an impact absorbing fence, is provided with a concrete foundation 1 along a slope or a road along the slope, and the concrete foundation. 1, a plurality of support columns 2 and 2A are erected at equal intervals in the left-right direction. In FIG. 1, it is shown side by side with the support columns 2, 2 </ b> A, 2 from the left side in the drawing, but further on the left side is continuous with the support columns 2 </ b> A, 2, 2 </ b> A. The support columns 2 and 2A are made of a hollow steel pipe or the like, and the lower end thereof is attached to the foundation 1, and the support column 2 is provided with a fixing unit 3 shown in FIG. 2 and FIG. The support column 2 is provided in a plurality of stages, for example, five stages. The fixing unit 3 forms a base frame 4 having a substantially U-shaped cross section that is long in the left-right direction, and plate plates 5, 5 are integrally provided on the front surfaces of the left and right ends of the base frame 4. A hole 6 is formed. One end 7A of one of left and right side direction and the other direction of the guard rope 7, 8, 8A to the fixed is Sakutan bracket 9 constituting the, respectively Re its one end, an end portion of the cord end fitting 9 Is provided with a male screw rod 9A, and the male screw rod 9A is inserted into the hole 6 of the flange plate portion 5 and a nut 9B is screwed into the male screw rod 9A so that one side and the other side of the guard rope. One end portions 7 A and 8 A of 7 and 8 are fixed to the fixing portion 3. A pair of left and right metal mounting arms 10 and 10 are integrally provided on the rear surface of the base frame 4 by welding, and the engagement grooves 10A and 10A formed at the base ends of the mounting arms 10 and 10 have the In a state where the front plate portion 12 of the support column 2 is inserted and arranged, the fixing unit 3 is detachably fixed to the support column 2 by an attachment member 11 such as a bolt. In the figure, reference numeral 13 denotes a cover that covers the front surface of the fixing unit 3. Further, the left end support column 2 in FIG. 1 becomes a support column of the falling rock guard fence, and the left end support column 2 is also provided with the fixing unit 3 as a fixing unit of the terminal, and the fixing unit 3 has a guard in the other direction. Only one end 8A of the rope 8 is fixed via the rope end fitting 9, and one end of the guard rope 7 in one side direction is fixed to the fixing portion 3 in the right end column of the falling rock protection fence not shown in FIG. Only the portion 7 </ b> A is fixed through the cable end fitting 9.
[0011]
A base frame 21 having a substantially U-shaped cross section shown in FIGS. 4 and 5 is provided in a plurality of stages, for example, five stages, on the support 2A positioned between the fixing units 3 and 3. The pair of mounting arms 10 and 10 are integrally formed on the rear surface of the base frame 21 by welding, and the engagement grooves 10A and 10A formed at the base ends of the mounting arms 10 and 10 are provided with the support columns 2 and 10A. In a state where the front plate portion 12 is inserted and arranged, the base frame 21 is fixed to the support column 2 by a bolt attachment member 11 or the like. Tightening members 22 and 22 are detachably provided at both ends of the base frame 21, respectively, and this fastening member 22 is used by screwing a nut 25 to a U bolt 23 via a stop plate 24. The both ends of the U-bolt 23 are inserted into holes 26 formed on both end sides of the base frame 21, and the nut 25 is screwed on the rear surface. Further, the one side and the other side guard ropes 7 and 8 having the one end portions 7A and 8A fixed by the fixing portion 3 are located at the front end portions of the base frame 21 located between the adjacent fixing portions 3 and 3. 7B and 8B are overlapped with each other to form an overlapping portion 27, and this overlapping portion 27 is positioned between the fastening members 22 and 22 provided on the base frame 21 and the fastening members 22 and 22 with a gap H therebetween. The fastening members 22 are arranged with a predetermined fastening force. Terminal protrusions 28 and 29 are fixed to the ends of the guard ropes 7 and 8 extending from the tightening members 22 and 22 in the one side direction and the other side direction, respectively. In the figure, reference numeral 13A denotes a cover that covers the front surface of the base frame 21. Further, as shown in FIG. 6, the guard ropes 7 and 8 are formed by twisting a plurality of steel strands to form a lasso 30 and further twisting a plurality of lasso 30. The lasso 30 located on the outer circumference of the ropes 7 and 8 has a spiral shape, and the lasso 30 on the outer circumference is twisted in a spiral shape 360 degrees from one side position in the cross section of the guide rope to reach the one side position in the cross section again. The reaching stranded wire pitch P and the interval H are made equal. Reference numeral 31 denotes a spacing member made of a plate or the like that is attached to the plurality of guard ropes 7 and 8 and holds the spacing between the guard ropes 7 and 8. Further, a net 33 made of a wire mesh or the like is stretched between the support columns 2 and 2A via upper and lower rope members 32. The net 33 is attached to a fixture (not shown) such as a clip, a wire or a band wire. ) Is attached to the front surface of the guard ropes 7,8.
[0012]
In addition, this shock absorbing fence uses a guard rope unit U in which the guard ropes 7 and 8, the base frame 21, the mounting arm 10 and a plurality of fastening members 22 are integrally assembled at the factory. In U, the end portions 7B and 8B of the guard ropes 7 and 8 are overlapped in advance at the factory to form an overlapping portion 27, and the overlapping portion 27 is tightened with the fastening members 22 and 22 provided on the base frame 21 and these tightening members. The fastening members 22 and 22 located between the members 22 and 22 and arranged with a space H are fastened with a predetermined fastening force, and the mounting arm 10 is welded to the rear surface of the base frame 21 at the factory. The cable end fittings 9 are fixed to the one end portions 7A and 8A of the guard ropes 7 and 8, respectively.
[0013]
Then, after fixing the fixing unit 3 to the column 2 at the site, the guard rope unit U is mounted between the columns 2 and 2, and in this case, the engaging groove 10A of the mounting arm 10 is aligned with the front plate 12 of the column 2A. The base frame 21 is inserted and arranged from above the support 2A and fixed at a predetermined height by bolts 11 or welding. Thereafter, the end portions 7A and 8A of the guard ropes 7 and 8 positioned at both ends of the guard rope unit U are fixed to the corresponding fixing portions 3, respectively. Then, the male screw rods 9A at both ends are inserted into the holes 6 and the nuts 9B are screwed into the inserted tips, whereby the one end portions 7A, 8A of the guard ropes 7, 8 can be easily fixed. Thus, after attaching the guard rope unit U to each predetermined place, the net 33 is attached. When an impact force is applied to the net body 33 due to falling rocks or the like, a tensile force acts on the guard ropes 7 and 8, and when the tensile force exceeds a predetermined value, that is, exceeds the limit static frictional resistance by the tightening member 22, the guard ropes 7 and 8 The one end portions 7B and 8B of 8 are frictionally slid, and a considerable amount of energy loss is generated by this friction, thereby absorbing the impact force. At the same time, the impact force is absorbed by the frictional sliding between the one end portions 7B and 8B and the fastening member 22. When the impact force is absorbed by the frictional sliding of the overlapping portion 27 and then recovered, the tightening member 22 is loosened to form the overlapping portion 27, and the tightening member 22 is fastened with a predetermined tightening force. Can only be recovered. Furthermore, the impact force of falling rocks is large, the overlapping portion 27 is frictionally slid and the terminal protrusions 28 and 29 are locked to the tightening member 22, and then a tensile force is applied to the guard ropes 7 and 8 to If the guard ropes 7 and 8 are stretched or cut due to plastic deformation, the guard ropes 7 and 8 between the fixing portions 3 and 3 where the stretched or cut portions are located are replaced and repaired. can do. When the guard ropes 7 and 8 are plastically deformed, that is, stretched, the impact force can be absorbed by the tensile stress of the guard ropes 7 and 8. In this case, the overlapping portion 27 slides and the terminal projection 28 Since the effective lengths of the guard ropes 7 and 8 between the support columns 2 and 2 are increased by the amount of movement until the 29 and 29 are locked to the tightening member 22, compared with the conventional guard rope having only the length between the support columns. The impact force absorption capacity can be increased. Further, after the overlapping portion 27 slides by the impact force and the terminal projections 28 and 29 are locked to the fastening member 22, the impact force is further absorbed by the deformation of the support columns 2 and 2A.
[0014]
Next, the support structure for supporting the rock fall protection fence will be described with reference to FIGS. 1 and 7. A support mounting hole 51 is formed in the foundation 1, and the inner surface of the support mounting hole 51 is formed on the inner surface. An inner cylinder 52 in which the lower part of the support columns 2 and 2A can be inserted and removed is provided, and a bottom part 53 is integrally provided at the lower part of the inner cylinder 52. The inner cylinder 52 and the bottom part 53 are made of steel, cast iron, It is made of a material harder than the foundation 1 such as stainless steel or high-strength concrete. The support columns 2 and 2A are inserted into the inner cylinder 52 and attached to the foundation 1.
[0015]
In the rock fall protection fence in which the pillars 2 and 2A are attached to the foundation 1 in this way, impact force such as rock fall is applied as described above, or rock falls collide with the pillars 2 and 2A. , 2A is bent, only the bent support columns 2 and 2A are pulled out, and the lower portions of the new support columns 2 and 2A are inserted into the support mounting holes 51 for installation. In this example, since the fixing unit 3 is detachably provided on the support columns 2 and 2A by the mounting member 11, the fixing unit 3 can be mounted on the replaced support columns 2 and 2A. Further, an inner cylinder 52 that is harder than concrete is provided on the inner periphery of the column mounting hole 51, and the periphery of the inner cylinder 52 is restrained by the concrete of the foundation 1, so that the columns 2 and 2A are bent. However, since the deformation of the inner cylinder 52 of the mounting hole 51 can be prevented and the inner cylinder 52 is not deformed, the support columns 2 and 2A can be exchanged smoothly.
[0016]
Thus, in the present reference example, the post mounting structure of avalanches, rockfall protection member attaching the standoff 2,2A underlying 1 made of concrete, a hard cylindrical body 52 from the foundation 1 in the post mounting hole 51 of the foundation 1 Since the lower part of the columns 2 and 2A is detachably attached to the cylindrical body 52, if the columns 2 and 2A are bent and deformed, the lower part of the columns 2 and 2A is removed from the mounting hole 51. The lower part of the new struts 2 and 2A can be inserted into the mounting holes 51 for replacement, and since the cylinder 52, which is harder than concrete, is restrained by the concrete, even if the struts 2 and 2A bend The deformation of the cylinder can be prevented, and the concrete around the mounting hole 51 can be prevented from being damaged, so that the new support columns 2 and 2A can be inserted smoothly.
[0017]
FIG. 8 shows a first embodiment of the present invention. The same reference numerals are given to the same parts as those in the above-mentioned reference example, and detailed description thereof will be omitted. In this example, the upper part of the inner cylinder 52 is arranged upward. An enlarged portion 52A is formed that expands in a curved shape. That is, the enlarged portion 52A has a trumpet shape.
[0018]
And also in this example, the support | pillars 2 and 2A can be inserted in and removed from the foundation 1 and attached. Further, even when the columns 2 and 2A bend due to falling rocks from the front direction indicated by the arrow R, the front of the columns 2 and 2A is not deformed so that the columns 2 and 2A are bent at the upper surface of the foundation 1. The S side is deformed by a tensile force, the back H side is deformed by a compressive force, and the struts 2 and 2A are deformed so as to bend, so that the rock fall energy can be efficiently absorbed by the deformation. As described above, the support pillars 2, 2 </ b> A are bent by the falling rock from the front surface S side so as to fall to the rear surface H side.
[0019]
Thus, in this embodiment, in accordance with claim 1 , in the support structure of the avalanche / falling rock protection structure in which the supports 2 and 2A are attached to the concrete foundation 1, the support pillar 51 is inserted into the support hole 51 for the support of the foundation 1. 2 and 2 are attached, and the upper part of the mounting hole 51 is formed so that the back surface H side of the support pillars 2 and 2A is enlarged upward. Therefore, when the support pillars 2 and 2A are bent, the upper part of the attachment hole 51 is upward. Therefore, energy absorption efficiency due to deformation can be improved without causing local buckling on the back surface H side of the support columns 2 and 2A. Further, since the upper portion of the attachment hole 51 is formed to be enlarged, the enlarged portion 52A serves as a guide, and the lower portions of the support columns 2 and 2A can be smoothly inserted.
[0020]
In this way, in this embodiment, corresponding to claim 2 , in the support structure of the avalanche / falling rock protector for attaching the supports 2 and 2A to the concrete base 1, the support holes 51 for the support 1 of the foundation 1 are provided. A cylindrical body 52 that is harder than the foundation 1 is provided, and the lower portions of the support columns 2 and 2A are detachably attached to the cylindrical body 52. The upper portion of the cylindrical body 52 is at least on the back H side of the support columns 2 and 2A. If the pillars 2 and 2A are bent and deformed, the lower part of the pillars 2 and 2A are removed from the attachment holes 51, and the lower parts of the new pillars 2 and 2A are inserted into the attachment holes 51. In addition, since the cylinder 52, which is harder than concrete, is restrained by the concrete, deformation is prevented even if the columns 2 and 2A are bent, and the new columns 2 and 2A are smoothly inserted. Can be worn. Further, when the support pillars 2 and 2A are bent, the upper part of the mounting hole 51 is enlarged upward, so that local buckling does not occur on the back surface H side of the support pillars 2 and 2A, and deformation occurs. Energy absorption efficiency is improved.
[0021]
Further, as an effect of the embodiment, since the enlarged portion 52A has a shape that expands upward in a curved shape, buckling on the back surface H side of the columns 2 and 2A can be reduced.
[0022]
FIG. 9 shows a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the above-mentioned reference example and the embodiment, and detailed description thereof will be omitted. The base 1 is provided on the slope 61, the support mounting hole 51 is provided in the base 1, and a support 62 made of a hollow steel pipe is inserted into the support mounting hole 51 by inserting the lower part thereof. A plurality of cross beams 63 are installed on the front S side of the plurality of columns 62. Further, as shown in the figure, the cylindrical body 52 is formed with an enlarged portion 52A on the back surface H side.
[0023]
Thus in this embodiment, the lower the detachably inserted and attached to the base 1 of the strut 61, from the inner cylinder 52 has an enlarged portion 52A, corresponding to claim 1-2, in the first embodiment It has the same action and effect.
[0024]
The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the embodiment, a cylindrical column is shown. Further, the inside of the support column can be filled with a filler such as concrete, and the support column can be solid. In addition, the material of the support can be selected as appropriate, and the inner cylinder is harder than the support, which is preferable for repeated replacement of the support, but since the outside of the inner cylinder is constrained by concrete, the inner cylinder is not necessarily the support. The material need not be harder, and the material can be appropriately selected as long as it is harder than the concrete concrete. Further, the enlarged portion is not necessarily curved.
[0025]
【The invention's effect】
According to the first aspect of the present invention, in the support structure for an avalanche / falling rock protection body in which the support is attached to a concrete foundation, the lower part of the support is attached to the support hole for the support of the foundation, and the upper part of the attachment hole is at least The back side of the column is enlarged upward, and an avalanche / falling rock protector column mounting structure with excellent energy absorption efficiency due to deformation of the column can be provided.
[0026]
Invention Motomeko 2, in post mounting structure of avalanches, rockfall protection member attaching the post to concrete foundation, a hard cylindrical body from said base is provided to the strut mounting hole of said base, it said in the cylindrical body The lower part of the column is removably inserted, and the upper part of the cylindrical body is formed such that at least the back side of the column is enlarged upward, the column can be easily replaced, and energy is absorbed by deformation of the column. It is possible to provide an avalanche / falling rock protector column mounting structure with excellent efficiency.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a reference example of the present invention.
FIG. 2 is a cross-sectional view of the front side of a fixing unit showing a reference example of the present invention.
FIG. 3 is a side sectional view of a fixing unit showing a reference example of the present invention.
FIG. 4 is a plan sectional view of an overlapping portion showing a reference example of the present invention.
FIG. 5 is a side sectional view of an overlapping portion showing a reference example of the present invention.
FIG. 6 is a perspective view of a guard rope showing a reference example of the present invention.
FIG. 7 is a cross-sectional view of a column mounting structure showing a reference example of the present invention.
FIG. 8 is a cross-sectional view of the support mounting structure showing the first embodiment of the present invention.
FIG. 9 is a cross-sectional view of a protective wall support mounting structure showing a second embodiment of the present invention.
FIG. 10 is a cross-sectional view of a conventional column mounting structure.
[Explanation of symbols]
1 Foundation 2, 2A Prop
51 Prop mounting holes
52 cylinder
52A Enlarged part

Claims (2)

支柱をコンクリート製の基礎に取付けた雪崩・落石防護体の支柱取付構造において、前記基礎の支柱用取付孔に前記支柱の下部を取付け、前記取付孔の上部は、少なくとも支柱の背面側が上方に向かって拡大形成されていることを特徴とする雪崩・落石防護体の支柱取付構造。 In the support structure of the avalanche and rockfall protection body with the support attached to the concrete foundation, the lower part of the support is attached to the support hole for the support of the foundation, and at least the back side of the support is directed upward at the upper part of the attachment hole. An avalanche / falling rock protector mounting structure, characterized in that it is enlarged . 支柱をコンクリート製の基礎に取付ける雪崩・落石防護体の支柱取付構造において、前記基礎の支柱用取付孔に前記基礎より硬質な筒体を設け、この筒体に前記支柱の下部を着脱可能に挿着し、前記筒体の上部は、少なくとも支柱の背面側が上方に向かって拡大形成されていることを特徴とする雪崩・落石防護体の支柱取付構造。 In the support structure of the avalanche / falling rock protection structure where the support is attached to a concrete foundation, a cylindrical body harder than the foundation is provided in the support hole for the support of the foundation, and the lower part of the support is inserted in this cylinder so that it can be attached and detached. An avalanche / falling rock protector support mounting structure, characterized in that the upper part of the cylindrical body is formed such that at least the back side of the support is enlarged upward .
JP06748298A 1998-03-17 1998-03-17 Support structure for avalanche and rock fall protection body Expired - Fee Related JP4026675B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06748298A JP4026675B2 (en) 1998-03-17 1998-03-17 Support structure for avalanche and rock fall protection body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06748298A JP4026675B2 (en) 1998-03-17 1998-03-17 Support structure for avalanche and rock fall protection body

Publications (2)

Publication Number Publication Date
JPH11264117A JPH11264117A (en) 1999-09-28
JP4026675B2 true JP4026675B2 (en) 2007-12-26

Family

ID=13346250

Family Applications (1)

Application Number Title Priority Date Filing Date
JP06748298A Expired - Fee Related JP4026675B2 (en) 1998-03-17 1998-03-17 Support structure for avalanche and rock fall protection body

Country Status (1)

Country Link
JP (1) JP4026675B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003082620A (en) * 2001-09-14 2003-03-19 Shibata Ind Co Ltd Retaining wall structure
KR100690072B1 (en) * 2006-02-22 2007-03-08 재 술 나 Assembly for support of h-beam strut
JP5792020B2 (en) * 2011-10-11 2015-10-07 東京製綱株式会社 Removable rockfall protection net and method for relocating rockfall protection net

Also Published As

Publication number Publication date
JPH11264117A (en) 1999-09-28

Similar Documents

Publication Publication Date Title
JP4580776B2 (en) Wire rope type rockfall protection fence
JP6393850B1 (en) Standing structure of support column in guard fence
CN103924703A (en) Shearing type buckling-restrained energy dissipation brace
JP4026675B2 (en) Support structure for avalanche and rock fall protection body
EP0015256B1 (en) Tubular post with yieldable fixing device
JP2012082677A (en) Guard fence
JP5132773B2 (en) fence
JP5525649B1 (en) Avalanche prevention facility
JP5123224B2 (en) Reinforcement structure of existing rockfall protection fence
JP2009102855A (en) Protective fence
JP2010222816A (en) Guard fence
JP4156556B2 (en) Protective fence
JP2018100484A (en) Rockfall protection fence
KR101958722B1 (en) A soundproof pannel fixing device of a tunnel soundproof wall using H-beam
JP3668965B2 (en) Protective net and fence
KR101856686B1 (en) A soundproof pannel fixing device of a tunnel soundproof wall using O-beam
JP2002348817A (en) Impact absorbing protective fence
KR200367716Y1 (en) A multi-purposed aluminum fence
JP2503929B2 (en) Shock absorber fence
JP2004019369A (en) Protection fence
CN218816425U (en) Rigid-flexible damping arch open cut tunnel protection system
JP2007205109A (en) Protective fence and construction method therefor
JP7356135B2 (en) protective fence
JP3555139B2 (en) Shock absorbing fence
JP2008144475A (en) Fixing structure of protective fence prop on covered ground part

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050105

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070314

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070514

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070628

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070925

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20071002

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101019

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111019

Year of fee payment: 4

LAPS Cancellation because of no payment of annual fees