JP2004150140A

JP2004150140A - Guardrail with wooden beam

Info

Publication number: JP2004150140A
Application number: JP2002317038A
Authority: JP
Inventors: Koichi Hirata; 弘一平田; Takeo Suenari; 健夫末成; Yoshisato Sato; 義悟佐藤
Original assignee: Nippon Steel Metal Products Co Ltd; Nittetsu Kenzai Fence Engineering KK
Current assignee: Nippon Steel Metal Products Co Ltd; Nittetsu Kenzai Fence Engineering KK
Priority date: 2002-10-31
Filing date: 2002-10-31
Publication date: 2004-05-27
Anticipated expiration: 2022-10-31
Also published as: JP4095880B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guardrail with the joint structure of a post and a wooden beam that can absorb impact at the collision of an automobile and reduce the damage of a joint part with simple constitution. <P>SOLUTION: The end parts of the wooden beams 7 laid between the posts 1 are supported to a bracket 11 fastened to the front face of the post 1 by a bolt 10. The bracket 11 is provided with a circular body part 11a shaped along the outer shape of the wooden beam 7, and the upper side of the circular body part 11a holds down one side parts on the post side of the wooden beams 7, while the lower side of the circular body part 11a extends onto the opposite side of the post 1 over the lower end parts of the wooden beams 7. The circular body part 11a extends to a prescribed length to the lateral sides of the post from the top view. After supporting the end parts 7a of the adjacent wooden beams 7, jointing bolts 14 are horizontally inserted through the upper side of the circular body part 11a and the axis parts of the wooden beams 7. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、資源の有効利用の一環として間伐材等を用いてなる木製ビームを有する防護柵に係り、特に、支柱と木製ビームとの接合構造に特徴がある木製ビームを有する防護柵に関する。
【０００２】
【従来の技術】
道路の側部に沿って設置されている防護柵（ガードレール）においては、支柱とビームとの接合構造を如何に合理化するかが改良点の主要部を占めており、これに関する改良案が従来多く提案されている。また、従来のガードレールの多くは金属製であるが、前述の間伐材等を用いた木製の防護柵の改良案も提案されている。木製と金属製の両防護柵において、支柱とビームとの接合構造に関しては共通に適用でき構造部分と、適用できない構造部分とがある。
【０００３】
本発明の対象である木製ビームを有する防護柵に関しての従来技術としては、例えば、後記の特許文献１、２、３、４、５等がある。これらの従来例は、木製ビームを有する防護柵に関するものではあるが、本発明とは基本的な構造が相違する。本発明と若干の関連性がある従来例として、金属製のガードレールに関する特開平９−２２８３３３号があり、これを説明する。
【０００４】
この先行技術の概要を図８〜図１１によって説明すると、道路の側部に間隔をあけて複数の支柱１が立設されており、この支柱１の正面に取付け金具３を介して金属パイプからなるビーム２が架設されてガードレールを構成している。前記の支柱１と取付け金具３とビーム２との取付け構造は次のようになっている。すなわち、支柱１の道路側壁上部に略Ｌ型で下部に支持部３ｂを有する取付け金具３の垂直部３ａを当てがい、この垂直部３ａと支柱１に開設したボルト孔に取付けボルト４を挿通しナットを締結することで、支柱１に取付け金具３を固着する。さらに、この略Ｌ型の取付け金具３の支持部３ｂに短尺筒状の接続金具５を載置して固定ボルト６で固定する。
【０００５】
次に、この接続金具５よりも一回り大径の金属パイプからなるビーム２の端部を接続金具５の両端から嵌合し、かつこの嵌合部に接合ボルト９を挿通することで、接続金具５とビーム２を固着する。こうして支柱１の前面において、接続金具５を介して道路側部に沿って伸長する複数のビーム２の端部同士を接続するものである。
【０００６】
ところで、間伐材を利用した防護柵における木製ビームを前記従来の接合構造に適用するときは、図１０又は図１１の構造となる。この場合、木製ビーム７は中実であるから金属管の接続金具５の外側に嵌めることができず、図のように筒状の接続金具５の内側に挿入することになる。そして、接続金具５と中実の木製ビーム７を貫通して接合ボルト９ａを設けることにより両部材を結合することになる。
【０００７】
図１０に示す木製ビームを有する防護柵において、運転ミスなどにより支柱１に自動車が衝突した際、図１１のように木製ビーム７は衝撃応力を受けて最終破壊部位８を残して折れ曲がり、破損する。これは木製ビーム７よりも金属製の接続金具５の強度が高いからであり、支柱１の前面側から衝撃が加わった際、接続金具５と木製ビーム７とが一体になって衝撃に抵抗するとき、接続金具５と木製ビーム７との境界部位（イ）に応力が集中し、該部が破壊されて衝撃を吸収するからである。なお、図９の金属管のビーム２では、前述のような破損はないが、ビーム２が曲がることで衝撃を吸収するか、或いは、金属製の接続金具５とビーム２の剛性が一定以上に高ければ、その衝撃は自動車自体を大きく破損させることになる。
【０００８】
【特許文献１】
特開平１１−３５０８００号公報
【特許文献２】
特開２０００−７３３２４号公報
【特許文献３】
特開２００２−２１０３１号公報
【特許文献４】
実公昭６２−１４１６７号公報
【特許文献５】
登録実用新案第３０３１３１６号公報
【特許文献６】
特開平９−２２８３３３号公報
【０００９】
【発明が解決しようとする課題】
木製ビームを有する防護柵における支柱と木製ビームとの接合構造には、通常、自動車が衝突したとき▲１▼衝撃を円滑に吸収できること、▲２▼接合部が破損し、飛び散らない構造であること、▲３▼構造をできるだけ簡潔にし、木製ビームがはずれないことなどが求められるが、従来提案されている技術はその要望に必ずしも応え得るものではない。特に、木製ビームを有する防護柵はその実績が少ないこともあって、前記▲１▼、▲２▼、▲３▼の観点から提案された改良技術は存在しない。また、木製ビームを有する防護柵には、強度や構造の面で金属製ガードレールと異なる問題があり、金属製ガードレールに関する既存技術を木製ビームを有する防護柵にそのまま適用できないという問題がある。
【００１０】
本発明は、前記従来の問題点に鑑みて提案するもので、その目的は、木製ビームを有する防護柵における支柱と木製ビームとの接合構造を、自動車が衝突したとき▲１▼衝撃を円滑に吸収できること、▲２▼接合部の破損、飛び散り等を少なくすること、▲３▼構造をできるだけ簡潔にし、木製ビームがはずれないようすること、これらの要望に応える新技術を提供することを目的とする。
【００１１】
【課題を解決するための手段】
前記の目的を達成するため、本発明は次のように構成する。
【００１２】
第１の発明は、所定間隔で地中に立設された支柱の前面にブラケットを固着し、該ブラケットに木製ビームの端部を支持させることで支柱間に木製ビームを架設する防護柵であって、前記ブラケットは木製ビームの外形に沿う円弧状部を具備しており、該円弧状部は支柱側円弧部と下部側円弧部からなり、前記木製ビームの支柱側部位を押さえる支柱側円弧部の上端は木製ビームの支柱側の中間部位を越えて上側に伸びていると共に、木製ビームの下側部を支持する下部側円弧部の先端は木製ビームの下端部位を越えて支柱の反対側に伸びており、前記支柱側円弧部と木製ビームの軸芯部を通して水平方向に接合ボルトを挿通するにことにより、隣接する木製ビームの端部を前記ブラケットに固着することを特徴とする。
【００１３】
第２の発明は、第１の発明において、木製ビームの下側部を支持する前記支柱側円弧部の木製ビーム長手方向長さが、木製ビームの支柱側部位を押さえる前記下部側円弧部の木製ビーム長手方向長さよりも長寸に設けてあることを特徴とする。
【００１４】
第３の発明は、第１又は第２の発明における前記ブラケットを、前記円弧状部を形成した円弧状本体部と、該円弧状本体部の背面側に固定した後部支持腕とから構成し、後部支持腕の後端部を支柱に当てがい、該支柱と後部支持腕を貫通する前記取付けボルトにより両部材を固着することを特徴とする。
【００１５】
図１、図２に示す模式図によって、本発明をさらに説明する。
【００１６】
各図において、所定間隔に立設された鋼管等の金属管からなる支柱１間に木製ビーム７が架設され、隣接する前記木製ビーム７の端部同士が前記支柱１の前面に取付けボルト１０で固着されたブラケット１１を介して接合されている。
【００１７】
前記ブラケット１１は断面が真円形状の木製ビーム７の外形に沿う円弧状本体部１１ａと、該円弧状本体部１１ａの背面側に突出する後部支持腕１１ｂとからなる。円弧状本体部１１ａは、さらに木製ビーム７の支柱側部位を押さえる支柱側円弧部１１ｃと、木製ビーム７の下側部位を支持する下部側円弧部１１ｄとからなる。また、後部支持腕１１ｂは、さらに上下の傾斜腕部１２と後部垂直腕部１３とを有し、上下の傾斜腕部１２の先端を円弧状本体部１１ａの背面上下部に溶接にて一体化する。
【００１８】
そして、後部支持腕１１ｂの後部垂直腕部１３を支柱１に当てがったうえ、支柱１と後部支持腕１１ｂを貫通して取付けボルト１０を設けることにより、ブラケット１１が支柱１の前面所定の高さに固着する。
【００１９】
ブラケット１１における円弧状本体部１１ａの支柱側円弧部１１ｃは木製ビーム７の支柱側の円弧状部位を押さえており、かつその上側端部は、木製ビーム７の支柱側の中間部位を越えて上側に伸びている。また、円弧状本体部１１ａの下部側円弧部１１ｄは木製ビーム７の円弧状の下部側部位を支え、かつその先端はビーム下端部（ロ）を越えて支柱１の反対側に伸びている。
【００２０】
前記ブラケット１１の円弧状本体部１１ａにおける支柱側円弧部１１ｃは平面的にみて支柱１の左右側（つまり、木製ビームの長手方向に）に所定寸法の長さ（Ｌ）だけ伸長している。また、下部側円弧部１１ｄは、支柱側円弧部１１ｃの長さ（Ｌ）よりも短い寸法の長さ（Ｌ_１）だけ木製ビームの長手方向に伸長している。
【００２１】
こうして支柱１の左右側に隣接する木製ビーム７のそれぞれの端部を下部側円弧部１１ｄで支持させる。さらに、下部側円弧部１１ｄの両端よりも外側寄りの部位において、支柱側円弧部１１ｃと木製ビーム７の軸芯部を通して水平方向に接合ボルト１４を挿通することにより、前記ブラケット１１に木製ビーム７を固着する。
【００２２】
本発明の木製ビームを有する防護柵において、運転ミスなどにより支柱１に自動車が衝突したとき、図２（Ａ）に平面的に示すように、ブラケット１１の円弧状本体部１１ａにおける、特に支柱側円弧部１１ｃが支柱１の部分を頂点として、「く」の字状に変形しそれに伴って、支柱１の左右側に伸びる木製ビーム７、７は円弧状本体部１１ａと一体に変位し、この変位によって衝撃を吸収すると共に、木製ビーム７、７自体も破損することがない。
【００２３】
また本発明では、図のように、下部側円弧部１１ｄの長さ（Ｌ_１）を木製ビーム７の端部を支持するのに必要な限度とし、支柱側円弧部１１ｃの長さ（Ｌ）よりも小さく設けておくことにより、下部側円弧部１１ｄが木製ビーム７の変位を拘束することが少なく、しかも、支柱側円弧部１１ｃは木製ビーム７の端部をしっかりと固定できる。したがって、支柱１の前側から衝撃が加わったとき、隣接する木製ビーム７の端部は支柱側円弧部１１ｃと一体に、「く」の字状に円滑に変形して、衝突による衝撃を確実に吸収できるうえ、木製ビーム７の破損も可及的に少なくすることができる。
【００２４】
さらに、ブラケット１１の支柱側円弧部１１ｃに開設するボルト孔１５は木製ビーム長手方向に長径が位置する楕円とすることで、衝突時、接合ボルト１４がボルト孔１５内で相対変位できて木製ビーム７の軸方向の変位に対応でき、この手段によっても木製ビーム７の破損を少なくできる。本発明の木製ビームを有する防護柵のさらなる強度対策として、支柱１のスパンを調整することで対応できる。すなわち、道路のカーブなどにおいては、支柱１の設置間隔を短くして、支柱本数を増加することで強度向上が図れる。
【００２５】
本発明の特徴を整理すると次の▲１▼〜▲５▼となる。
▲１▼木製ビーム７をブラケット１１に支持させ、接合ボルト１４で背面側から止めることで、衝突時ブラケット１１が変形し、支柱１の変位に木製ビーム７が追従し、対応できる。
▲２▼木製ビーム７の軸直角方向に貫通して接合ボルト１４を挿入するための、ブラケット１１の円弧状本体部１１ａに形成するボルト孔１５は、長径がビーム長手方向とした楕円に形成することで衝突時、木製ビーム７の伸び（長手方向の変位）に対応できる。
▲３▼接合ボルト１４を木製ビーム７に水平方向に挿通して止めるため、作業性、施工性がよい。
▲４▼衝突方向に接合ボルト１４が位置しているので、木製ビーム７の端部の破壊強度が高い。
▲５▼木製ビーム７の配置時の勾配に対応できる。
【００２６】
【発明の実施の形態】
以下、本発明の実施形態を図３〜図７を参照して説明する。なお、図１、図２と同一要素には同一符号を付して説明する。
【００２７】
図３（Ａ）は、実施形態に係る木製ビームを有する防護柵の正面図、同（Ｂ）は、同（Ａ）の側面断図、図４は、図３（Ａ）の（ハ）部の拡大平面図、図５は、図４の正面図、図６（Ａ）は、図５の（ニ）−（ニ）断面図、同図（Ｂ）は、同図（Ａ）の（ホ）−（ホ）矢視図である。また、図７は、（Ａ）は、ブラケットの一部破断平面図、（Ｂ）は正面図、（Ｃ）は（Ｂ）の中央部縦断側面図、（Ｄ）は背面図、（Ｅ）は斜視図である。
【００２８】
図３に示すように、支柱１が道路１６の側部に所定の間隔をあけて立設されている。すなわち、支柱１の下端部は、図３（Ｂ）に示すように地中に所定深さ掘削した穴１７に支柱１が挿入され、支柱１と穴１７の間隙に補強金を介してアスファルト又はモルタル１８を充填して道路１６の側部にしっかりと埋設されている。この支柱１の前面において、ブラケット１１を介して上下２段の木製ビーム７が接続され道路１６沿って配置されている。
【００２９】
図４以下に示すように、ブラケット１１の後部支持腕１１ｂにおける後部垂直腕部１３にはボルト孔１９が開設されていて、支柱１を貫通する取付けボルト１０の先端を前記ボルト孔１９に挿通し、ナット２０を締めることでブラケット１１をしっかりと支柱１に固定できる。
【００３０】
つぎに、支柱１に固定したブラケット１１の円弧状本体部１１ａの中間部で隣り合う木製ビーム７の端部同士を突き合わせるよう配置し、長さ寸法（Ｌ_１）の下部側円弧部１１ｄで木製ビーム７の下側部位を支持させ、長さ寸法（Ｌ）の支柱側円弧部１１ｃで木製ビーム７の支柱側円弧部を押さえる。
【００３１】
さらに、木製ビーム７の端部に軸芯を通して軸直角方向に開設したボルト孔２１と、支柱側円弧部１１ｃの両端よりの部位に開設したボルト孔１５に接合ボルト１４を挿入したうえ、支柱側からナット２３を締めることで、木製ビーム７の端部をブラケット１１に固着する。ボルト孔２１の木製ビーム７の前面側の端部にはビーム表面をえぐることにより、ボルト頭部が嵌る凹部２２が形成されていて、ボルト頭部１４ａは、この凹部２２に位置することで、木製ビーム７の表面から突出することがない。
【００３２】
前記円弧状本体部１１ａの支柱側円弧部１１ｃに開設したボルト孔１５は、その長径部が木製ビーム７の長手方向に位置するような楕円孔とすることで、衝突時、木製ビーム７の伸びに対応でき、その接合部に無理な力が作用するのを低減できる。
【００３３】
本実施形態において、自動車の衝突などにより支柱１に前面側から衝撃が加わったとき、図２で説明したように、ブラケット１１が「く」の字に変形し、支柱１の変位に木製ビーム７も追従でき、衝撃を吸収できると共に、木製ビーム７が折損するおそれを解消できる。支柱側円弧部１１ｃの長さ寸法（Ｌ）と下部側円弧部１１ｄの長さ寸法（Ｌ_１）を、Ｌ＞Ｌ_１とすることにより、支柱１の前面部位に衝撃が加わったとき、支柱側円弧部１１ｃと一体に木製ビーム７を一層円滑に変形させて確実に衝撃を吸収できると共に、木製ビーム７を破損させないことは、図２で説明したのと同じである。
【００３４】
本発明の図に示した構成を適宜設計変更して実施することは、本発明の技術的範囲に含まれる。
【００３５】
【発明の効果】
本発明によると、木製ビームを有する防護柵において、支柱と木製ビームとの接合構造を、自動車が衝突したとき衝撃を吸収でき、しかも前記接合部の破損をできるだけ少なくすることができ、さらに構造が簡潔である。
【図面の簡単な説明】
【図１】（Ａ）は、本発明に係る木製ビームを有する防護柵の平面模式図、（Ｂ）は、正面模式図、（Ｃ）は、側面模式図である。
【図２】（Ａ）は、図１の木製ビームを有する防護柵が衝撃を受けて変形する状態を示す平面模式図、（Ｂ）は、正面模式図、（Ｃ）は、側面模式図である。
【図３】（Ａ）は、本発明の実施形態に係る木製ビームを有する防護柵の正面図、（Ｂ）は、側断面図である。
【図４】図３（ハ）部の拡大平面図である。
【図５】図４の正面図である。
【図６】（Ａ）は、図５の（ニ）−（ニ）断面図、（Ｂ）は、同図（Ａ）の（ホ）−（ホ）矢視図である。
【図７】（Ａ）は、ブラケットの一部破断平面図、（Ｂ）は正面図、（Ｃ）は（Ｂ）の中央部縦断側面図、（Ｄ）は背面図、（Ｅ）は斜視図である。
【図８】従来例に係る木製ビームを有する防護柵の正面図である。
【図９】（Ａ）は、従来例に係る木製ビームを有する防護柵の平面模式図、（Ｂ）は、正面模式図、（Ｃ）は、側面模式図である。
【図１０】（Ａ）は、比較例として示す木製ビームを有する防護柵の平面模式図、（Ｂ）は、正面模式図、（Ｃ）は、側面模式図である。
【図１１】（Ａ）は、図１０の木製ビームを有する防護柵が衝撃を受けて変形する状態を示す平面模式図、（Ｂ）は正面模式図、（Ｃ）は、側面模式図である。
【符号の説明】
１支柱
２ビーム
３取付け金具
３ａ垂直部
３ｂ支持部
４接合ボルト
５接続金具
６固定ボルト
７木製ビーム
８最終破壊部位
１０取付けボルト
１１ブラケット
１１ａ円弧状本体部
１１ｂ後部支持腕
１１ｃ支柱側円弧部
１１ｄ下部側円弧部
１２傾斜腕部
１３後部垂直腕部
１４接合ボルト
１５ボルト孔
１６道路
１７穴
１８アスファルト又はモルタル
１９ボルト孔
２０ナット
２１ボルト孔
２２凹部
２３ナット[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a protective fence having a wooden beam using thinned wood or the like as a part of effective use of resources, and more particularly to a protective fence having a wooden beam characterized by a joint structure between a support and a wooden beam.
[0002]
[Prior art]
Regarding the guard fences installed along the side of the road, how to rationalize the joint structure between the columns and the beams is the main part of the improvement, and there have been many improvements related to this. Proposed. Although many of the conventional guardrails are made of metal, an improvement plan of a wooden protective fence using the above-mentioned thinned wood or the like has been proposed. In both the wooden and metal protective fences, there are structural parts that can be applied in common to the joint structure between the column and the beam, and structural parts that cannot be applied.
[0003]
As a prior art related to a protective fence having a wooden beam, which is an object of the present invention, for example, there are Patent Documents 1, 2, 3, 4, and 5 described below. These conventional examples relate to a protective fence having a wooden beam, but differ in basic structure from the present invention. As a conventional example having some relevance to the present invention, there is JP-A-9-228333 relating to a metal guardrail, which will be described.
[0004]
An outline of this prior art will be described with reference to FIGS. 8 to 11. A plurality of columns 1 are erected at intervals on the side of a road, and a metal pipe is attached to the front of the column 1 via a mounting bracket 3. Beam 2 is constructed to form a guardrail. The mounting structure of the support 1, the mounting 3 and the beam 2 is as follows. That is, the vertical portion 3a of the mounting bracket 3 having a substantially L shape and having a support portion 3b at the lower portion is applied to the upper portion of the road side wall of the column 1, and the mounting bolt 4 is inserted into the vertical portion 3a and the bolt hole formed in the column 1. By fixing the nut, the mounting bracket 3 is fixed to the column 1. Further, a short tubular connecting fitting 5 is placed on the support portion 3b of the substantially L-shaped fitting 3 and fixed with fixing bolts 6.
[0005]
Next, the end of the beam 2 made of a metal pipe having a diameter slightly larger than that of the connection fitting 5 is fitted from both ends of the connection fitting 5, and the joining bolt 9 is inserted into the fitting portion, thereby making the connection. The metal fitting 5 and the beam 2 are fixed. In this manner, on the front surface of the column 1, the ends of the plurality of beams 2 extending along the side of the road are connected via the connection fitting 5.
[0006]
By the way, when a wooden beam in a protective fence using thinned wood is applied to the above-mentioned conventional joint structure, the structure shown in FIG. 10 or FIG. 11 is used. In this case, since the wooden beam 7 is solid, it cannot be fitted to the outside of the connection fitting 5 of the metal pipe, and is inserted inside the cylindrical connection fitting 5 as shown in the figure. Then, the connecting members 5 and the solid wooden beam 7 are penetrated to provide the joining bolts 9a, so that the two members are joined.
[0007]
In a protective fence having a wooden beam shown in FIG. 10, when an automobile collides with the column 1 due to an operation error or the like, the wooden beam 7 receives impact stress as shown in FIG. . This is because the strength of the metal connection fitting 5 is higher than that of the wooden beam 7, and when an impact is applied from the front side of the column 1, the connection fitting 5 and the wooden beam 7 are integrated to resist the impact. At this time, stress is concentrated on the boundary portion (a) between the connection fitting 5 and the wooden beam 7, and the portion is broken to absorb the impact. The beam 2 of the metal tube shown in FIG. 9 does not have the above-mentioned breakage, but absorbs an impact by bending the beam 2 or the rigidity of the metal fitting 5 and the beam 2 exceeds a certain level. If high, the impact will severely damage the car itself.
[0008]
[Patent Document 1]
JP-A-11-350800 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-73324 [Patent Document 3]
JP 2002-21031 A [Patent Document 4]
Japanese Patent Publication No. 62-14167 [Patent Document 5]
Registered Utility Model No. 3031316 [Patent Document 6]
JP-A-9-228333
[Problems to be solved by the invention]
The joint structure between the pillar and the wooden beam in the protective fence having a wooden beam usually has the following features: (1) it can absorb the impact smoothly when the vehicle collides; (2) it has a structure in which the joint is broken and does not scatter. (3) It is required that the structure be as simple as possible and that the wooden beam does not come off. However, the techniques proposed in the past cannot always meet the demand. In particular, there is little improvement in protective fences with wooden beams, and there is no improved technology proposed from the viewpoints of (1), (2), and (3). Further, the guard fence having a wooden beam has a problem different from that of a metal guardrail in terms of strength and structure, and there is a problem that existing technology relating to a metal guardrail cannot be directly applied to a guard fence having a wooden beam.
[0010]
The present invention has been proposed in view of the above-mentioned conventional problems, and an object of the present invention is to provide a joint structure between a support post and a wooden beam in a protective fence having a wooden beam, which enables a (1) smooth impact when an automobile collides. The objective is to be able to absorb, (2) to reduce breakage and splattering of joints, and (3) to make the structure as simple as possible and to prevent the wooden beam from coming off, and to provide new technologies that meet these demands. I do.
[0011]
[Means for Solving the Problems]
To achieve the above object, the present invention is configured as follows.
[0012]
A first invention is a protective fence for mounting a wooden beam between columns by fixing a bracket to the front surface of a column standing underground at predetermined intervals and supporting the end of the wooden beam with the bracket. The bracket has an arc-shaped portion along the outer shape of the wooden beam, and the arc-shaped portion includes a column-side arc portion and a lower-side arc portion, and the column-side arc portion presses the column-side portion of the wooden beam. The upper end of the lower part of the wooden beam extends upward beyond the middle part of the wooden beam on the column side, and the tip of the lower circular arc that supports the lower part of the wooden beam is on the opposite side of the column beyond the lower part of the wooden beam. The end portion of the adjacent wooden beam is fixed to the bracket by extending a connecting bolt in a horizontal direction through the column-side arc portion and the axial center portion of the wooden beam.
[0013]
According to a second aspect of the present invention, in the first aspect, the length of the wooden beam in the longitudinal direction of the column-side circular portion supporting the lower portion of the wooden beam is smaller than that of the lower side circular portion of the wooden beam supporting the column-side portion of the wooden beam. It is characterized by being provided longer than the length in the beam longitudinal direction.
[0014]
According to a third aspect of the present invention, the bracket according to the first or the second aspect of the present invention comprises the arc-shaped main body formed with the arc-shaped portion, and a rear support arm fixed to a back side of the arc-shaped main body. The rear end of the rear support arm is applied to a support, and the two members are fixed by the mounting bolt penetrating the support and the rear support arm.
[0015]
The present invention will be further described with reference to the schematic diagrams shown in FIGS.
[0016]
In each of the drawings, a wooden beam 7 is erected between pillars 1 made of metal pipes such as steel pipes erected at predetermined intervals, and ends of the adjacent wooden beams 7 are attached to the front surface of the pillar 1 with mounting bolts 10. It is joined via the fixed bracket 11.
[0017]
The bracket 11 includes an arc-shaped main body 11a along the outer shape of the wooden beam 7 having a perfect circular cross section, and a rear support arm 11b protruding to the rear side of the arc-shaped main body 11a. The arc-shaped main body portion 11a further includes a column-side circular arc portion 11c for holding down the column-side portion of the wooden beam 7, and a lower-side circular portion 11d for supporting a lower portion of the wooden beam 7. The rear support arm 11b further has upper and lower inclined arms 12 and a rear vertical arm 13, and the tips of the upper and lower inclined arms 12 are integrated by welding to the upper and lower rear portions of the arc-shaped main body 11a. I do.
[0018]
Then, the rear vertical arm 13 of the rear support arm 11b is applied to the column 1, and the mounting bolt 10 is provided through the column 1 and the rear support arm 11b. Stick to height.
[0019]
The column-side arc portion 11c of the arc-shaped main body portion 11a of the bracket 11 presses the arc-shaped portion of the wooden beam 7 on the column side, and its upper end is located above the intermediate portion of the wooden beam 7 on the column side. Is growing. The lower arc portion 11d of the arc-shaped main body portion 11a supports an arc-shaped lower portion of the wooden beam 7, and its tip extends to the opposite side of the column 1 beyond the lower end portion (b) of the beam.
[0020]
The strut-side arc portion 11c of the arc-shaped main body portion 11a of the bracket 11 extends by a predetermined length (L) on the left and right sides of the strut 1 (that is, in the longitudinal direction of the wooden beam) in plan view. The lower circular arc portion 11d extends in the longitudinal direction of the wooden beam by a length (L ₁ ) shorter than the length (L) of the column-side circular arc portion 11c.
[0021]
In this way, the respective ends of the wooden beams 7 adjacent to the left and right sides of the column 1 are supported by the lower circular arc portion 11d. Further, at a portion closer to the outside than both ends of the lower-side arc portion 11d, the joining bolt 14 is inserted in the horizontal direction through the column-side arc portion 11c and the shaft core of the wooden beam 7, so that the wooden beam 7 is inserted into the bracket 11. Is fixed.
[0022]
In the protective fence having a wooden beam of the present invention, when an automobile collides with the support 1 due to an operation error or the like, as shown in a plan view in FIG. The circular arc portion 11c is deformed in the shape of a "ku" with the portion of the column 1 as a vertex, and accordingly, the wooden beams 7, 7 extending to the left and right sides of the column 1 are displaced integrally with the circular main portion 11a. The wooden beams 7, 7 themselves are not damaged while the shock is absorbed by the displacement.
[0023]
Further, in the present invention, as shown in the figure, the length (L ₁ ) of the lower circular arc portion 11d is set to a limit necessary for supporting the end of the wooden beam 7, and the length (L) of the support side circular arc portion 11c is set. By providing a smaller size, the lower circular arc portion 11d is less likely to restrict the displacement of the wooden beam 7, and the strut side circular arc portion 11c can firmly fix the end of the wooden beam 7. Therefore, when an impact is applied from the front side of the column 1, the end of the adjacent wooden beam 7 is smoothly deformed into a “<” shape integrally with the column-side arc portion 11 c, and the impact due to the collision is surely prevented. In addition to the absorption, the wooden beam 7 can be damaged as little as possible.
[0024]
Further, the bolt hole 15 formed in the column-side arc portion 11c of the bracket 11 is formed as an ellipse whose major axis is positioned in the longitudinal direction of the wooden beam. 7 can be accommodated in the axial direction, and this means can also reduce damage to the wooden beam 7. As a further measure against the strength of the protective fence having the wooden beam of the present invention, it can be dealt with by adjusting the span of the column 1. That is, in a curve of a road or the like, strength can be improved by shortening the installation interval of the columns 1 and increasing the number of columns.
[0025]
The features of the present invention are summarized in the following (1) to (5).
{Circle around (1)} The wooden beam 7 is supported by the bracket 11 and is stopped from the rear side by the joining bolts 14, so that the bracket 11 is deformed at the time of collision, and the wooden beam 7 follows the displacement of the support column 1 and can respond.
{Circle over (2)} A bolt hole 15 formed in the arc-shaped main body 11a of the bracket 11 to penetrate the wooden beam 7 in a direction perpendicular to the axis and to insert the joining bolt 14 is formed into an ellipse having a major axis whose longitudinal direction is the beam longitudinal direction. This makes it possible to cope with the elongation (displacement in the longitudinal direction) of the wooden beam 7 at the time of collision.
{Circle around (3)} Since the joining bolt 14 is inserted into the wooden beam 7 in the horizontal direction and stopped, the workability and workability are good.
{Circle over (4)} Since the joining bolt 14 is located in the collision direction, the breaking strength of the end of the wooden beam 7 is high.
(5) It is possible to cope with the gradient at the time of disposing the wooden beam 7.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 are denoted by the same reference numerals and described.
[0027]
FIG. 3A is a front view of a protective fence having a wooden beam according to the embodiment, FIG. 3B is a side sectional view of FIG. 3A, and FIG. 5, FIG. 5 is a front view of FIG. 4, FIG. 6 (A) is a cross-sectional view of FIG. 5 (d)-(d), and FIG. FIG. 7A is a partially cutaway plan view of the bracket, FIG. 7B is a front view, FIG. 7C is a vertical sectional side view of the center of FIG. 7B, FIG. 7D is a rear view, and FIG. Is a perspective view.
[0028]
As shown in FIG. 3, the columns 1 are erected at predetermined intervals on the side of the road 16. That is, as shown in FIG. 3 (B), the lower end of the column 1 is inserted into the hole 17 excavated to a predetermined depth in the ground, and the gap between the column 1 and the hole 17 is filled with asphalt or reinforcing metal through reinforcing metal. The mortar 18 is filled and firmly buried on the side of the road 16. On the front surface of the support 1, two upper and lower wooden beams 7 are connected via a bracket 11 and are arranged along a road 16.
[0029]
As shown in FIG. 4 and subsequent figures, a bolt hole 19 is formed in the rear vertical arm 13 of the rear support arm 11 b of the bracket 11, and the tip of the mounting bolt 10 penetrating the column 1 is inserted into the bolt hole 19. By tightening the nut 20, the bracket 11 can be firmly fixed to the column 1.
[0030]
Next, the ends of the wooden beams 7 adjacent to each other in the middle of the arc-shaped main body 11a of the bracket 11 fixed to the column 1 are arranged so as to abut each other, and the lower side arc 11d having the length dimension (L ₁ ) is used. The lower portion of the wooden beam 7 is supported, and the column-side arc portion of the wooden beam 7 is pressed by the column-side arc portion 11c having the length (L).
[0031]
Further, the joining bolt 14 is inserted into a bolt hole 21 formed in a direction perpendicular to the axis through an axis at the end of the wooden beam 7 and a bolt hole 15 formed at both ends of the column-side arc portion 11c. Then, the end of the wooden beam 7 is fixed to the bracket 11 by tightening the nut 23. At the end of the bolt hole 21 on the front side of the wooden beam 7, a recess 22 in which the bolt head fits is formed by digging the beam surface, and the bolt head 14 a is located in the recess 22. It does not protrude from the surface of the wooden beam 7.
[0032]
The bolt hole 15 formed in the column-side arc portion 11c of the arc-shaped main body portion 11a is formed into an elliptical hole whose major diameter portion is located in the longitudinal direction of the wooden beam 7, so that the wooden beam 7 can be extended at the time of collision. And the excessive force acting on the joint can be reduced.
[0033]
In this embodiment, when an impact is applied to the column 1 from the front side due to a collision of an automobile or the like, the bracket 11 is deformed into a “<” shape as described with reference to FIG. Can be followed, the impact can be absorbed, and the wooden beam 7 can be prevented from being broken. Length of the strut side arc portion 11c (L) and the length of the lower side arc portion 11d (L _1), by the L> L _1, when an impact is applied to the front portion of the post 1, strut The wooden beam 7 can be more smoothly deformed integrally with the side arc portion 11c so as to reliably absorb the impact, and the wooden beam 7 is not damaged, as described with reference to FIG.
[0034]
It is within the technical scope of the present invention to design and implement the configuration shown in the drawings of the present invention as appropriate.
[0035]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in the protective fence which has a wooden beam, the joint structure of a support | pillar and a wooden beam can absorb a shock when an automobile collides, and also can minimize the damage of the said joint part, Furthermore, the structure is improved. Be concise.
[Brief description of the drawings]
1 (A) is a schematic plan view of a protective fence having a wooden beam according to the present invention, FIG. 1 (B) is a schematic front view, and FIG. 1 (C) is a schematic side view.
2A is a schematic plan view showing a state in which the protective fence having the wooden beam of FIG. 1 is deformed by receiving an impact, FIG. 2B is a schematic front view, and FIG. 2C is a schematic side view. is there.
FIG. 3A is a front view of a protective fence having a wooden beam according to the embodiment of the present invention, and FIG. 3B is a side sectional view.
FIG. 4 is an enlarged plan view of FIG.
FIG. 5 is a front view of FIG. 4;
6A is a cross-sectional view of FIG. 5D and FIG. 5B is a cross-sectional view of FIG.
7A is a partially cutaway plan view of a bracket, FIG. 7B is a front view, FIG. 7C is a longitudinal side view of the center of FIG. 7B, FIG. 7D is a rear view, and FIG. FIG.
FIG. 8 is a front view of a protective fence having a wooden beam according to a conventional example.
9A is a schematic plan view of a protective fence having a wooden beam according to a conventional example, FIG. 9B is a schematic front view, and FIG. 9C is a schematic side view.
10A is a schematic plan view of a protective fence having a wooden beam shown as a comparative example, FIG. 10B is a schematic front view, and FIG. 10C is a schematic side view.
11A is a schematic plan view showing a state in which the protective fence having the wooden beam of FIG. 10 is deformed by receiving an impact, FIG. 11B is a schematic front view, and FIG. 11C is a schematic side view. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Prop 2 Beam 3 Mounting bracket 3a Vertical part 3b Supporting part 4 Joint bolt 5 Connection bracket 6 Fixing bolt 7 Wooden beam 8 Final destruction site 10 Mounting bolt 11 Bracket 11a Arc-shaped main body 11b Rear support arm 11c Column-side arc 11d Lower part Side arc portion 12 Inclined arm portion 13 Rear vertical arm portion 14 Joint bolt 15 Bolt hole 16 Road 17 Hole 18 Asphalt or mortar 19 Bolt hole 20 Nut 21 Bolt hole 22 Recess 23 Nut

Claims

A protective fence for mounting a wooden beam between columns by fixing a bracket to the front of a column erected in the ground at predetermined intervals and supporting the end of the wooden beam with the bracket, wherein the bracket is made of wood. An arc-shaped portion is provided along the outer shape of the beam, and the arc-shaped portion includes a column-side arc portion and a lower-side arc portion, and the upper end of the column-side arc portion that holds down the column-side portion of the wooden beam is formed of a wooden beam. The tip of the lower arc portion supporting the lower portion of the wooden beam extends upward beyond the intermediate portion on the column side and extends to the opposite side of the column beyond the lower end portion of the wooden beam. A protective fence having a wooden beam, wherein an end of an adjacent wooden beam is fixed to the bracket by inserting a joining bolt in a horizontal direction through a side arc portion and an axis of the wooden beam.

The length of the wooden arc in the longitudinal direction of the support-side circular portion supporting the lower portion of the wooden beam is provided to be longer than the length of the wooden arc in the longitudinal direction of the lower circular portion for holding the support-side portion of the wooden beam. A protective fence having a wooden beam according to claim 1, characterized in that:

The bracket includes an arc-shaped main body formed with the arc-shaped part, and a rear support arm fixed to a back side of the arc-shaped main body, and a rear end of the rear support arm is applied to a column, The protective fence having a wooden beam according to claim 1 or 2, wherein the two members are fixed by the mounting bolt penetrating a support post and a rear support arm.