JP2004324214A

JP2004324214A - Construction method for roof frame of structure

Info

Publication number: JP2004324214A
Application number: JP2003120037A
Authority: JP
Inventors: Hajime Nakajima; 肇中島; Tatsuya Niimura; 達也新村; Yasuyuki Saraumi; 康行皿海; Tomomi Kanemitsu; 知巳兼光
Original assignee: Shimizu Construction Co Ltd; Shimizu Corp
Current assignee: Shimizu Construction Co Ltd; Shimizu Corp
Priority date: 2003-04-24
Filing date: 2003-04-24
Publication date: 2004-11-18
Anticipated expiration: 2023-04-24
Also published as: JP4066023B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roof frame of a structure, which enables an intended tensile force to be properly introduced into the roof frame of a very long span structure, and to provide a construction method for the roof frame. <P>SOLUTION: In the roof frame 3, a roof frame 4 combines a first linear-type string beam frame 10 with a plurality of bundles and a second string beam frame 13, using a tension ring, with a SKELSION frame 18 which is composed of a first cable-like material and a second cable-like material. The first cable-like material is slackly coupled to one end of a lower chord, and a joining point between the lower chord and a first bundle material adjacent to one end of the lower chord. The second cable-like material is arranged in such a manner that an intermediate part of first cable-like material can be coupled to a lower part of an outer peripheral frame 2 on a side whereon one end of the lower chord is supported. In the construction of the SKELSION frame 18, when the tensile force is introduced into the second cable-like material, the following processes are sequentially repeated. In the processes, a set of the second cable-like materials is subjected to the introduction of the tensile force, and the tensile force is introduced into a new set of them, including the adjacent second cable-like material into which the tensile force has already been introduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、長大スパン構造物に適用される張弦梁構造を備えた構造物の屋根架構の構築方法に関する。
【０００２】
【従来の技術】
従来より、長大スパン構造物における屋根架構には、架構形式の一つとして張弦梁屋根架構が一般に知られている。該張弦梁屋根架構は、鉛直方向の荷重が作用した際に、屋根架構の部材応力を低減することを目的に用いられるもので、上方へ湾曲させた屋根を構成する張弦材の中間位置に、鉛直下方向に延在する支持部材が固定されており、張弦材の両端部、及び支持部材の先端部を連結するように引張材が配されることにより張弦梁が構成されるものである。これらは、前記張弦梁を構成する引張材を緊張させることにより、張弦材に上方向の反力を付与することができ、また張弦梁を断面剛性の高い構造とすることができるものである。
【０００３】
このような張弦梁屋根架構は、例えば、特許文献１に示すように、屋根を構成する平行に配列された複数の張弦材を中間部で連結するように、張弦材に直交する鋼材を配置し、該鋼材の両端部各々に鉛直下方向に前記支持部材を配置し、屋根の両端部、及び支持部材を連結するように対をなして引張材を連結する等の構成が考案されている。
【０００４】
このような張弦梁屋根架構の張力導入方法は、複数の前記引張材を同時一斉に緊張させればよいため、導入張力の精度が確保され、さらに張力導入量に係る自動制御を行えば、導入過程や最終段階での管理を容易に行うことのできるものである。
【０００５】
【特許文献１】
特開平６−１３６８２８号公報
【０００６】
一方で、長大スパン構造物の屋根架構に対して水平方向の剛性を付与することを目的に、平行に配列された複数の張弦材の各々に、該張弦材と構造物を構成する外周架構もしくは地盤等の両者を連結する引張材を備えるスケルション構造が考案されている。この場合の張力導入方法は、平行に配列された複数の張弦材に対して、１列づつ引張材を緊張させる方法を用いている。
【０００７】
【発明が解決しようとする課題】
しかしながら、このような長大スパン構造物の屋根架構に対して水平方向の剛性を付与することを目的にスケルション構造を用いる構成では、ある引張材に張力を導入すると、これと隣接する引張材にも張力の影響を与えることとなり、これらを推定した上で複数の引張材各々の張力を設定することは煩雑であり、張力の導入量に高い精度を期待することはできない。また、隣接する張弦材への影響を抑制するため、引張材への張力導入作業を複数回に分割して実施する必要があり、作業の長期化を招きかねない。
【０００８】
上記事情に鑑み、本発明は、長大スパン構造物の屋根架構に意図した張力を適切に導入できる構造物の屋根架構の構築方法を提供することを目的としている。
【０００９】
【課題を解決するための手段】
請求項１記載の構造物の屋根架構の構築方法は、所定の離間間隔をもって向かい合うように配置された対をなす外周架構と、該外周架構に両側端部が支持されるように配される屋根架構とを備える構造物の屋根架構の構築方法であって、対をなす外周架構を所定の離間間隔をもって向かい合うように構築するとともに、平板型立体トラス構造の屋根フレームを地組し、該屋根フレームに、対をなす外周架構を連結する方向に延在する屋根フレームの下弦材、該下弦材の中間位置に対をなして配され、鉛直下方向に突出する第１の束材、及び対をなす該第１の束材の先端部及び前記下弦材の両端部を連結する第１の引張材よりなる第１の張弦梁架構を取り付けた上で、該屋根フレームを第１の仮支柱に支持した状態で、前記外周架構の上部に建て込む第１の工程と、第１の引張材に所望の張力を導入した後、屋根フレームより前記第１の仮支柱を撤去する第２の工程と、前記屋根フレームに、前記下弦材の一端と該下弦材の一端の近傍側に配される前記第１の束材の下弦材との接合点とを連結する前記第１の索状材、及び該第１の索状材の中間部と前記下弦材の一端を支持している外周架構の下部とを連結する第２の索状材よりなるスケルション架構を、前記第１の張弦材架構の両端部に対をなして取り付け、少なくとも第１の索状材が緊張するように、第２の索状材に張力を導入する第３の工程により構築され、第３の工程で、第２の索状材への張力導入には、隣り合う所定数の第２の索状材を１組として所定量の張力導入を行った後、新たな隣り合う複数の第２の索状材と、これと隣接し、既に張力導入を実施した第２の索状材を合わせて、１組の所定数の第２の索状材とし、所定量の張力導入を行う工程を順次繰り返すことを特徴としている。
【００１０】
請求項２記載の構造物の屋根架構の構築方法は、第１の工程で、対をなす外周架構を中間部から一端に向かって、段階的に拡張するように構築するとともに、離間間隔が段階的に拡張している領域に位置する前記屋根フレームに、テンションリング、該テンションリングを前記屋根フレームの下弦材より吊り降ろす複数の第２の束材、及びテンションリングの外周面より放射状に延在し前記屋根フレームの外周縁に連結する第２の張弦材よりなる第２の張弦梁架構を取り付けるとともに、該第２の張弦梁架構及び屋根フレームを第２の仮支柱で支持し、第１の工程の後、第２の張弦梁架構を第２の仮支柱より開放した上で第２の張弦材を緊張させた後、屋根フレームより前記第２の仮支柱を撤去し、第２の工程を実施することを特徴としている。
【００１１】
請求項３記載の構造物の屋根架構の構築方法は、第３の工程の後、第４の工程として、第１の張弦梁架構を構成する対をなす第１の束材、張弦材、及び第１の引張材に囲まれた領域に斜材を構築することを特徴としている。
【００１２】
【発明の実施の形態】
本発明の構造物の屋根架構の構築方法を、図１から図８に示す。本発明は、構造物の屋根架構に、鉛直方向の荷重が作用した際にも、屋根架構の部材応力を低減できる張弦梁架構を用いるとともに、水平方向の剛性を付与することを目的としたスケルション架構をあわせて適用しており、両者を組み合わせた張力導入を行うことにより、意図した張力を適切に導入し、屋根架構の性の確保と施工の簡略化を図るものである。
【００１３】
図１に示すように、構造物１は、外周架構２と屋根架構３とを備えている。外周架構２は、平板型立体トラス構造を垂直に立設することにより構成されており、長さ方向で中間部から一端側にむかって離間間隔が段階的に拡幅するものの、中間部から他端側は所定量の等間隔を離間するように、２体が対をなして向かい合うように配置されている。ここで、平板型立体トラス構造は、図２（ａ）に示すように、鋼管よりなる弦材５及び斜材６を、球体状のハブ７を介して連結したもので、多目的ドームやアリーナの屋根架構等に広く用いられているものである。
【００１４】
一方、前記屋根架構３も外周架構２と同様の平板型立体トラス構造よりなる屋根フレーム４を備えている。該屋根フレーム４は、図２（ｂ）に示すように、平板型立体トラス構造を水平に配置した上で、複数の上弦材本体８ａが水平方向に連接されることにより形成された上弦材８、これと同様に複数の下弦材本体９ａが水平方向に連接されることにより形成された下弦材９が、それぞれ上方に湾曲した形状を有している。該屋根フレーム４は、対をなす前記外周架構２に両方の側部４ａを支持されるように設置されているため、その平面視形状は、図１に示すように、略長方形の領域Ａと、扇形状の領域Ｂを足し合わせた形状に形成されている。
【００１５】
上述する屋根フレーム４を備える屋根架構３には、第１の張弦梁架構１０、第２の張弦梁架構１３、及びスケルション架構１８が備えられている。第１の張弦梁架構１０は、一般に複数束を備える直線型として知られる張弦梁架構であり、図３（ａ）に示すように、前記屋根フレーム４の略長方形な領域Ａに構築されている。これらは、対をなす外周架構２を連結するように延在しており、所定の離間間隔をもって、外周架構２の長さ方向に複数配置されている。図３（ｂ）に示すように、対をなす外周架構２を連結する方向に延在する前記屋根フレーム４の下弦材９を張弦材とし、該下弦材９、第１の束材１１及び第１の引張材１２により構成され、第１の束材１１は、張弦材として機能する下弦材９の中間部近傍の下端面に、所定の離間間隔をもって対をなして固定手段を介して固定されている。また、前記第１の引張材１２は、屋根フレーム４の両方の側部４ａ、及び対をなす第１の束材１１の突端部の４点を連結するように配置されている。
【００１６】
なお、本実施の形態において、図３（ａ）に示すように、第１の引張材１２は、第１の束材１１から前記屋根フレーム４の側部４ａにむかって二股に分かれている。したがって、第１の引張材１２は、両端部ともに前記屋根フレーム４の両方の側部４ａに対して、各々２点支持となるように構成されている。
また、対をなす第１の束材１１、第１の張弦梁架構１０の張弦材として機能する下弦材９、及び第１の引張材１２により構成される構面内に、図３（ｂ）に示すように、対をなす第１の束材１１の曲げを防止することを目的に、斜材２４が取り付けられている。
【００１７】
このような構成の第１の張弦梁架構１０は、第１の引張材１２に適切な張力が付与されることにより、前記第１の束材１１を介して張弦材として機能する前記下弦材９に、上方への反力を付与することができる。したがって、図３（ａ）に示すように、複数の第１の張弦梁架構１０を、平行となるように外周架構２の長さ方向に連設配置することにより、屋根フレーム４の略長方形な領域Ａ全体に上方への反力を付与することができることから、屋根フレーム４の領域Ａにおける部材応力を低減することができるため、鉛直荷重が作用することにより生じやすい屋根フレーム４の変形を抑制することができるものである。
【００１８】
一方、図４（ａ）に示すように、前記屋根フレーム４の略扇形状の領域Ｂには、第２の張弦梁架構１３が構築されており、これらは、テンションリング１４と、剛体よりなる第２の束材１５と、第２の引張材１６と、補剛部材１７により構成されている。前記テンションリング１４は、図４（ｂ）に示すように、前記屋根フレーム４の領域Ｂの略中央部で下方に配置されており、前記第２の束材１５で屋根フレーム４の下弦材９より支持されている。
また、前記第２の引張材１６は、一端を該テンションリング１４の外周縁に固定され、他端を前記屋根フレーム４の領域Ｂの外周縁近傍に固定されている。これら第２の引張材１６は、図５に示すように、テンションリング１４上に設けられた４つの引張作用領域Ｃ_１各々より、複数が放射状に延在するように配置されており、引張作用領域Ｃ_１の配置位置や数量、及び第２の引張材１６の本数は、テンションリング１４に均等な外方への張力を付与することができるとともに、所定の張力量を確保できれば何れを用いても良い。
【００１９】
さらに、前記テンションリング１４の内方には、複数の補剛部材１７が設置されている。これらは、張力を導入されることにより、テンションリング１４に作用する過剰な外方向の引張力に抵抗し、テンションリング１４の変形を抑制するよう、補剛するものである。本実施の形態では、テンションリング１４の内周面に５箇所の連結点Ｃ_２が配置され、該連結点Ｃ_２を介して平面視で星形を形成するように５本の補剛部材１７が配置されている。しかし、補剛部材１７の配置や本数はこれにこだわるものではなく、少なくとも前記テンションリング１４に過剰な外方への引張力が作用する可能性の高い部位、つまり引張作用領域Ｃ_１近傍に連結点Ｃ_２を配置し、かつ連結点Ｃ_２を利用して、テンションリング１４全体に均等な大きさの引張力を、テンションリング１４の中心点方向Ｏに生じさせることができる構成であれば、その配置位置や本数は何れを用いても良い。
【００２０】
このような構成の第２の張弦梁架構１３は、前記第２の引張材１６に適切な張力を付与されることにより、前記第２の束材１５を介して前記屋根フレーム４の略扇形状の領域Ｂ全体に上方への反力を付与することができることから、屋根フレーム４の領域Ｂにおける部材応力を低減することができるため、鉛直荷重が作用することにより生じやすい屋根フレーム４の変形を抑制することができるものである。
したがって、前記屋根フレーム４を、略長方形状の領域Ａと、扇形状の領域Ｂという具合に、特徴的な平面視形状を有する部位に区分した上で、各々の形状に効果的な構成の張弦梁架構を付与することにことにより、自重や雪荷重等の鉛直荷重に対して前記屋根フレーム４全体の部材応力を低減することができ、変形の生じにくい安全な構造を構築することができるものである。
【００２１】
さらに、上述する屋根フレーム４には、前記第１の張弦梁架構１０及び第２の張弦梁架構１３に加えて、第１の張弦梁架構１０にスケルション架構１８が備えられて、屋根架構３を形成している。該スケルション架構１８は、図３（ｂ）に示すように、第１の索状材１９と、第２の索状材２０により構成されており、前記第１の張弦梁架構１０で張弦材として機能していた屋根フレーム４の下弦材９と、前記外周架構２とを連結するように配置されるものである。具体的には、第１の索状材１９が一端を前記下弦材９の一方の端部に、他端を下弦材９と該下弦材９の一方の端部に隣接する前記第１の束材１１との接合点に、弛んだ状態で連結され、前記第２の索状材２０が、該第１の索状材１９の中間部と、前記下弦材９の一方の端部が支持されている側の前記外周架構２の下部を連結するように配置されている。
これらは、前記第２の索状材２０に張力を付加することにより第１の索状材１９が緊張し、これに伴い、前記張弦材９の一方の端部が原位置を固定されて、地震や風等の水平荷重が作用した際にも、張弦材９の一方の端部が原位置を維持するものである。したがって、上述するものと同様のスケルション架構１８を、張弦材９の他方の端部にも備えることにより、前記屋根フレーム４は、水平荷重に対して適正な剛性を有する構造となるものである。
【００２２】
上述するような、前記屋根フレーム４に、第１の張弦梁架構１０、第２の張弦梁架構１３、及びスケルション架構１８を備えた、屋根架構３の構築方法を図６及び図７を用いて以下に詳述する。
【００２３】
第１の工程では、図６に示すように、前記構造物１を構成する対をなす外周架構２と、屋根フレーム４を構築する。
まず、前記構造物１を構成する対をなす外周架構２を構築するとともに、平板型立体トラス構造の屋根フレーム４を地組する。なお、本実施の形態において、前記外周架構２は、屋根フレーム４と同様の平板型立体トラス構造に構築しているが、必ずしもこれにこだわるものではなく、前記屋根フレーム４を支持できる構成を有していれば、何れを用いても良い。
【００２４】
次に、前記屋根フレーム４の領域Ａにおける対をなす外周架構２を連結する方向の下弦材９の中間部に、所定の離間距離をもって第１の張弦梁架構１０に備えられる対をなす第１の束材１１を、鉛直下方に延伸するように固定手段を介して固定する。なお、対をなす前記第１の束材１１は、前記屋根フレーム４を構築する際に、前記下弦材本体９ａに固定手段を固定しておく構成としても良い。
【００２５】
次に、前記屋根フレーム４の領域Ｂの下方で略中央部に、テンションリング１４を位置決めし、屋根フレーム４の下弦材９と、テンションリング１４の上端縁を複数の第２の束材１５を介して連結する。また、前記テンションリング１４の外周面に備えられた複数の引張作用領域Ｃ_１各々の近傍に、複数の第２の引張材１６の一端を固定手段を介して固定し、該第２の引張材１６が、引張作用領域Ｃ_１を中心に放射状に延在するように、他端を前記屋根フレーム４の外周縁に固定手段を介して固定する。
なお、前記テンションリング１４には、あらかじめその内方に複数の補剛部材１７を取り付けておく。
【００２６】
この後、図６（ａ）に示すように、前記屋根フレーム４の領域Ａを第１の仮支柱２１、２１ａ、領域Ｂ及び前記テンションリング１４を第２の仮支柱２２、２２ａで支持した状態で、前記外周架構２の上部に建て込む。このとき、前記第２の引張材１６には張力を与えず、弛ませておく。なお、前記対をなす外周架構２を連結する方向の下弦材９は、前記第１の仮支柱２１を両側部、第１の仮支柱２１ａを前記下弦材９の中間部に配置し、３点で支持する。また、第２の仮支柱２２は、領域Ｂ及び前記テンションリング１４の両者を支持する位置、第２の仮支柱２２ａは、テンションリング１４の内方中央部で屋根フレーム４のみを支持する位置に配置する。
【００２７】
第２の工程では、前記屋根フレーム４に、第１の張弦梁架構１０と第２の張弦梁架構１３を構築する。
まず、図６（ｂ）に示すように、前記屋根フレーム４の領域Ｂにおいて、前記テンションリング１４のみを第２の仮支柱２２より開放した上で、複数の第２の引張材１６に図示しない油圧ジャッキを用いて同時一斉に所定量の張力を導入する工程を段階的な張力量をもって複数回繰り返す。なお、前記油圧ジャッキは、張力管理を自動制御するものである。
この後、前記テンションリング１４の内方中央部で領域Ｂのみを支持する第２の仮支柱２２ａをジャッキダウンし、さらに第２の引張材１６への張力を増加させた後、前記屋根フレーム４を支持している複数の前記第１の仮支柱２１から、前記屋根フレーム４をほぼ同時に開放することにより、図６（ｃ）に示すように、屋根フレーム４に第２の張弦梁架構１３を構築し、第２の仮支柱２２はすべて撤去する。
【００２８】
次に、図６（ｃ）に示すように、前記屋根フレーム４の領域Ａにおいて、対をなす第１の束材１１の突端部、及び前記下弦材９の両端部各々が連結されてる屋根フレーム４の外周縁を連結するように、複数の第１の引張材１２を固定手段を介して固定する。このとき、該第１の引張材１２は、第１の束材１１に曲げを生じない部材長を用いることとし、張力は導入しない。このとき、前記第１の引張材１２について、屋根フレーム４の外周縁と前記第１の束材１１を連結している第１の引張材１２ａは、第１の束材１１に曲げを生じさせないことを目的に、張力を付与するのではなく、長さ管理により緊張した状態を確保し、対をなす第１の束材１１間にを連結する第１の引張材１２ｂには、ターンバックルを備えておく。
【００２９】
次に、対をなす第１の束材１１間を連結する第１の引張材１２ｂに、図示しないターンバックルを用いて、所定量の張力を導入する工程を段階な張力量をもって複数回繰り返す。
これら第１の引張材１２ｂに張力を導入する際には、図８に示すように、まず、第１の番目ＨＳ_１に所定量の張力を導入して、あらかじめ固定しておいたひずみゲージ２３ａをモニタリングし、所定量の張力を導入するために必要な、ターンバックルに付与するトルク量を決定する。このときトルク値は、１〜０．１ｔｆ・ｃｍ間隔とする。決定したトルク値に従い、第２番目から中央部に位置する第６番目ＨＳ_６まで、順に所定量の張力を導入する。この後、中央部に位置する第６番目ＨＳ_６の第１の引張材１２ｂにあらかじめ固定しておいたひずみゲージ２３ｂをモニタリングし、導入された張力が管理許容差内であるかを確認した後、残る第１の引張材１２ｂにも１台づつ順に張力を導入する。最後ＨＳ_１１まで張力を導入した後、最後ＨＳ_１１の第１の引張材１２にあらかじめ固定しておいたひずみゲージ２３ｃをモニタリングし、再度導入された張力が管理許容差内であるかを確認する。このような作業を導入する張力量を段階的に上げながら複数回繰り返し、必要張力を第１の引張材１２ｂに導入する。
なお、対をなす第１の束材１１間にを連結する第１の引張材１２ｂに備えられたターンバックルは、一般に用いられているものと同様で、トルクレンチを回転することにより張力を導入できる構成を有するものである。
【００３０】
この後、前記対をなす外周架構２を連結する方向の下弦材９の中間部を支持する前記第１の仮支柱２１ａをジャッキダウンし、さらに第１の引張材１２ｂの張力を増加させる。この後、前記対をなす外周架構２を連結する方向の下弦材９の両側部を支持する該第１の仮支柱２１から、対をなす外周架構２を連結する方向の下弦材９をほぼ同時に開放することにより、図６（ｄ）に示すように、前記屋根フレーム４に第１の張弦梁架構１０を構築し、第１の仮支柱２１はすべて撤去する。
【００３１】
第３の工程では、図７に示すように、第１の仮支柱２１、２１ａが撤去され、外周架構２のみに支持されている屋根フレーム４にスケルション架構１８を構築する。
まず、前記第１の張弦梁架構１０において張弦材として機能する前記下弦材９の一方の端部、及び該下弦材９の一方の端部に隣接する前記第１の束材１１と下弦材９との接点、の両者を連結するように第１の索状材１９を固定手段を介して固定するとともに、該第１の索状材１９の中間部と前記外周架構２の下部を連結するように、第２の索状材２０を固定手段を介して固定する。
【００３２】
次に、図７（ａ）に示すように、第１番目ＣＢ_１から第３番目ＣＢ_３の３本の第２の索状材２０を一組として、これらに図示しない油圧ジャッキを持ちいて所定量の張力を導入する。次に、図７（ｂ）に示すように、第３番目ＣＢ_３から第５番目ＣＢ_５の３本の第２の索状材２０を一組として、これらに油圧ジャッキを持ちいて所定量の張力導入する。このように、新たな第２の索状材２０に張力を導入しようとする際には、既に張力導入済みの隣接する第２の索状材２０を含めて組を形成し、これらに対して一斉同時に所定量の張力を導入する。
なお、本実施の形態では、３本を一組として所定量の張力を導入したが、必ずしもこれにこだわるものではなく、何れの本数を一組としても良い。
【００３３】
このような方法で最終ＣＢ_ｅｎｄまで張力を導入する工程を、導入する張力量を段階的に上げながら必要張力に達するまで複数回繰り返す。なお、本実施の形態では、張力の導入ステップを必要張力の３０、６０、８０、９０、１００％の５段階のステップを経る手順としているが、そのステップは必ずしもこれにこだわるものではない。
【００３４】
第４の工程では、図７（ｃ）に示すように、前記第１の張弦梁架構１０を構成する対をなす第１の束材１１の曲げを防止することを目的に、対をなす第１の束材１１、第１の張弦梁架構１０の張弦材として機能する下弦材９、及び第１の引張材１２により構成される構面内に斜材２４を取り付ける。
【００３５】
上述する工程により、前記屋根フレーム４に第１の張弦梁架構１０、第２の張弦梁架構１３及びスケルション架構１８を備える屋根架構３が、対をなす前記外周架構２の上部に設置され、この後、様々な設備工事等が実施されて、構造物１が構築される。
【００３６】
上述する構成によれば、前記屋根架構３は、平板型立体トラス構造の屋根フレーム４に、複数束を備える直線型の前記第１の張弦梁架構１０及びテンションリング１４を用いた第２の張弦梁架構１３と、スケルション架構１８の両者を兼ね備える。これにより、自重や雪荷重等の鉛直荷重に対して前記屋根フレーム４全体の部材応力を低減することができ、変形の生じにくい安全な構造の屋根架構３を構築することが可能になるとともに、地震や風等の水平荷重が作用した際にも、屋根フレーム４を前記外周架構２の所定位置に確実に固定でき、水平荷重に対して適正な剛性を有する屋根架構３を構築することが可能となる。
【００３７】
前記第１の張弦梁架構１０には、前記第１の束材１１に生じやすい曲げを防止する斜材２４が備えられることから、過剰な自重や雪荷重等の鉛直荷重に対しても、第１の張弦梁架構１０が有効に機能し、前記屋根フレーム４全体の部材応力を低減することが可能となる。
【００３８】
前記屋根架構３は、平面視長方形の領域Ａに複数束を備える直線型の第１の張弦梁架構１０、平面視扇形状の領域Ｂにテンションリング１４を用いた第２の張弦梁架構１３を構築したことから、各々の形状に効果的な構成の張弦梁架構を付与することにより、簡略な構成で効果的に自重や雪荷重等の鉛直荷重に対して前記屋根フレーム４全体の部材応力を低減することが可能となる。
【００３９】
前記屋根架構３の構築方法は、前記スケルション架構１８の設置工程において、第２の索状材２０を複数を一組として張力導入を行い、新たな一組には、隣接する張力導入済みの第２の索状材２０を含めて張力導入を行う工程を順次繰り返す。これにより、平行に複数配置されている第２の索状材２０に順次張力を導入する工程において、張力導入中の第２の索状材２０に隣接する張力導入後の第２の索状材２０への張力量への影響を、最小限に抑えることが可能となり、高い精度で意図した張力を第２の索状材２０に容易に付与することが可能となり、工費削減、工期短縮に大きく寄与できるとともに、容易に設計品質を確保することが可能となる。
【００４０】
【発明の効果】
請求項１から３に記載の屋根架構の構築方法によれば、所定の離間間隔をもって向かい合うように配置された対をなす外周架構と、該外周架構に両側端部が支持されるように配される屋根架構とを備える構造物の屋根架構の構築方法であって、対をなす外周架構を所定の離間間隔をもって向かい合うように構築するとともに、平板型立体トラス構造の屋根フレームを地組し、該屋根フレームに、対をなす外周架構を連結する方向に延在する屋根フレームの下弦材、該下弦材の中間位置に対をなして配され、鉛直下方向に突出する第１の束材、及び対をなす該第１の束材の先端部及び前記下弦材の両端部を連結する第１の引張材よりなる第１の張弦梁架構を取り付けた上で、該屋根フレームを第１の仮支柱に支持した状態で、前記外周架構の上部に建て込む第１の工程と、第１の引張材に所望の張力を導入した後、屋根フレームより前記第１の仮支柱を撤去する第２の工程と、前記屋根フレームに、前記下弦材の一端と該下弦材の一端の近傍側に配される前記第１の束材の下弦材との接合点とを連結する前記第１の索状材、及び該第１の索状材の中間部と前記下弦材の一端を支持している外周架構の下部とを連結する第２の索状材よりなるスケルション架構を、前記第１の張弦材架構の両端部に対をなして取り付け、少なくとも第１の索状材が緊張するように、第２の索状材に張力を導入する第３の工程により構築され、第３の工程で、第２の索状材への張力導入には、隣り合う所定数の第２の索状材を１組として所定量の張力導入を行った後、新たな隣り合う複数の第２の索状材と、これと隣接し、既に張力導入を実施した第２の索状材を合わせて、１組の所定数の第２の索状材とし、所定量の張力導入を行う工程を順次繰り返す。
【００４１】
または、第１の工程で、対をなす外周架構を中間部から一端に向かって、段階的に拡張するように構築するとともに、離間間隔が段階的に拡張している領域に位置する前記屋根フレームに、テンションリング、該テンションリングを前記屋根フレームの下弦材より吊り降ろす複数の第２の束材、及びテンションリングの外周面より放射状に延在し前記屋根フレームの外周縁に連結する第２の張弦材よりなる第２の張弦梁架構を取り付けるとともに、該第２の張弦梁架構及び屋根フレームを第２の仮支柱で支持し、第１の工程の後、第２の張弦梁架構を第２の仮支柱より開放した上で第２の張弦材を緊張させた後、屋根フレームより前記第２の仮支柱を撤去し、第２の工程を実施する。
【００４２】
もしくは、第３の工程の後、第４の工程として、第１の張弦梁架構を構成する対をなす第１の束材、張弦材、及び第１の引張材に囲まれた領域に斜材を構築する。
【００４３】
これにより、スケルション架構を構成する平行に複数配置されている第２の索状材に順次張力を導入する工程において、張力導入中の第２の索状材に隣接する張力導入後の第２の索状材への張力量への影響を、最小限に抑えることが可能となり、高い精度で意図した張力を第２の索状材に容易に付与することが可能となり、工費削減、工期短縮に大きく寄与できるとともに、容易に設計品質を確保することが可能となる。
【図面の簡単な説明】
【図１】本発明に係る屋根架構の概略を示す図である。
【図２】本発明に係る外周架構、及び屋根架構を構成する屋根フレームの詳細を示す図である。
【図３】本発明に係る屋根架構の詳細（その１）を示す図である。
【図４】本発明に係る屋根架構の詳細（その２）を示す図である。
【図５】本発明に係る屋根架構のテンションリングの概略を示す図である。
【図６】本発明に係る屋根架構を構成する第１の張弦梁架構及び第２の張弦梁架構の構築方法を示す図である。
【図７】本発明に係る屋根架構を構成するスケルション架構の構築方法を示す図である。
【図８】本発明に係る屋根架構の平面視を示す図である。
【符号の説明】
１構造物
２外周架構
３屋根架構
４屋根フレーム
５弦材
６斜材
７ハブ
８上弦材
８ａ上弦材本体
９下弦材
９ａ下弦材本体
１０第１の張弦梁架構
１１第１の束材
１２第１の引張材
１３第２の張弦梁架構
１４テンションリング
１５第２の束材
１６第２の引張材
１７補剛部材
１８スケルション架構
１９第１の索状材
２０第２の索状材
２１第１の仮支柱
２２第２の仮支柱
２３ａひずみゲージ
２３ｂひずみゲージ
２３ｃひずみゲージ
２４斜材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of constructing a roof frame of a structure having a beam string structure applied to a long span structure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a roof frame in a long and long span structure, a beam string roof frame has been generally known as one of frame types. The beam string roof frame is used for the purpose of reducing the member stress of the roof frame when a load in the vertical direction is applied. The beam string roof frame is vertically positioned at an intermediate position between the string members constituting the roof curved upward. A support member extending in the direction is fixed, and a tension member is provided by connecting a tension member so as to connect both ends of the string member and a tip end of the support member, thereby forming a string beam. These can provide an upward reaction force to the string member by tensioning the tensile member constituting the string string, and can also provide the string string with a structure having high sectional rigidity.
[0003]
As described in Patent Document 1, for example, such a string string roof frame is configured by disposing a steel member orthogonal to the string member so as to connect a plurality of parallel string members constituting a roof at an intermediate portion. A configuration has been devised in which the support members are arranged vertically downward at both ends of the roof, and tension members are connected in pairs so as to connect both ends of the roof and the support members.
[0004]
Such a tension introducing method of the beam string roof frame requires a plurality of the tension members to be simultaneously and simultaneously tensioned, so that the accuracy of the introduced tension is ensured, and furthermore, if the automatic control relating to the amount of introduced tension is performed, the introduction process is performed. And management at the final stage can be easily performed.
[0005]
[Patent Document 1]
JP-A-6-136828
[0006]
On the other hand, for the purpose of imparting horizontal rigidity to the roof frame of the long span structure, each of the plurality of string members arranged in parallel is provided with an outer frame or ground or the like constituting the structure with the string member. A skeletal structure having a tension member connecting the two has been devised. In this case, the tension introducing method employs a method of tensioning the tension members one by one with respect to a plurality of string members arranged in parallel.
[0007]
[Problems to be solved by the invention]
However, in a configuration using a skeletal structure for the purpose of imparting horizontal rigidity to the roof frame of such a long span structure, when tension is introduced into a certain tensile material, the tensile material adjacent to the tension material is applied to the tensile material. Therefore, it is troublesome to set the tension of each of the plurality of tension members after estimating them, and it is not possible to expect high precision in the amount of introduced tension. Further, in order to suppress the influence on the adjacent string material, it is necessary to divide the tension into the tension member a plurality of times and perform the operation, which may lead to a prolonged operation.
[0008]
In view of the above circumstances, an object of the present invention is to provide a method of constructing a roof frame of a structure that can appropriately introduce intended tension into a roof frame of a long and long span structure.
[0009]
[Means for Solving the Problems]
2. The method for constructing a roof frame of a structure according to claim 1, wherein the pair of outer frames are disposed so as to face each other with a predetermined separation interval, and the roof is arranged such that both ends are supported by the outer frames. A method for constructing a roof frame of a structure including a frame, comprising constructing a pair of outer frames so as to face each other at a predetermined separation interval, laying a roof frame having a flat space truss structure, and forming the roof frame. A lower chord member of a roof frame extending in a direction of connecting the pair of outer frame members, a first bundle member arranged in a pair at an intermediate position between the lower chord members, and protruding vertically downward; After attaching a first stringed beam frame made of a first tension member connecting a tip end of the first bundle to be formed and both ends of the lower chord, the roof frame was supported by first temporary columns. In the upper part of the outer frame A first step of introducing the desired tension into the first tension member, and then a second step of removing the first temporary post from the roof frame; and attaching one end of the lower chord member to the roof frame. A first cord-like member that connects a joining point of the first bundle material with a lower chord material disposed near one end of the lower chord material, and an intermediate portion of the first cord-like material; A skeletal frame made of a second cord-like member connecting the lower portion of the outer frame supporting one end of the lower chord member is attached to both ends of the first string member frame in pairs, and at least the first It is constructed by a third step of introducing tension to the second cord so that the cord is tensioned, and in the third step, the tension is applied to the second cord in a predetermined manner adjacent to the second cord. After a predetermined amount of tension is introduced into a set of the number of second cords, a new plurality of adjacent second cords, Adjacent, already combined second cord-like member embodying the tensioning, a set of a predetermined second number of cord-like material is characterized by sequentially repeating the step of performing the tensioning of a predetermined amount.
[0010]
In the method for constructing a roof frame of a structure according to claim 2, in the first step, a pair of outer peripheral frames is constructed so as to expand stepwise from an intermediate portion to one end, and the separation interval is stepwise. A tension ring, a plurality of second bundles for hanging the tension ring from a lower chord of the roof frame, and radially extending from an outer peripheral surface of the tension ring. And attaching a second string string frame made of a second string member to be connected to the outer peripheral edge of the roof frame, supporting the second string string frame and the roof frame with second temporary columns, and after the first step. After the second beam string frame is opened from the second temporary post and the second string member is tensioned, the second temporary post is removed from the roof frame, and the second step is performed. Toshii .
[0011]
In the method for constructing a roof frame of a structure according to claim 3, as a fourth step after the third step, a pair of the first bundle member, the string member, and the first string member constituting the first beam string frame are provided. The oblique material is constructed in a region surrounded by the tensile material.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 8 show a method of constructing a roof frame of a structure according to the present invention. The present invention uses a stringed beam frame capable of reducing the member stress of the roof frame even when a vertical load is applied to the roof frame of the structure, and provides skeletal structure for imparting horizontal rigidity. The frame is applied together, and by introducing the tension in combination of both, the intended tension is properly introduced, and the property of the roof frame is secured and the construction is simplified.
[0013]
As shown in FIG. 1, the structure 1 includes an outer frame 2 and a roof frame 3. The outer frame 2 is constructed by vertically erection of a flat space truss structure, and the spacing gradually increases from the middle part to one end in the length direction, but the width from the middle part to the other end increases. The sides are arranged so that two bodies face each other so as to be separated by a predetermined amount at equal intervals. Here, as shown in FIG. 2A, the flat space truss structure is a structure in which a chord member 5 and a diagonal member 6 made of a steel pipe are connected via a spherical hub 7, and is used for a multipurpose dome or arena. It is widely used for roof frames and the like.
[0014]
On the other hand, the roof frame 3 is also provided with a roof frame 4 having the same flat truss structure as the outer frame 2. As shown in FIG. 2 (b), the roof frame 4 has an upper chord material 8 formed by arranging a flat type three-dimensional truss structure horizontally and connecting a plurality of upper chord material bodies 8a in a horizontal direction. Similarly, the lower chord material 9 formed by connecting a plurality of lower chord material bodies 9a in the horizontal direction has an upwardly curved shape. Since the roof frame 4 is installed on the pair of outer frames 2 so as to support both side portions 4a, its plan view shape is substantially rectangular area A as shown in FIG. , And a fan-shaped region B.
[0015]
The roof frame 3 including the above-described roof frame 4 includes a first beam string frame 10, a second beam string frame 13, and a skeletal frame 18. The first beam string frame 10 is a beam string frame generally known as a straight type having a plurality of bundles, and is constructed in a substantially rectangular area A of the roof frame 4 as shown in FIG. These extend so as to connect the pair of outer frames 2, and are arranged in the longitudinal direction of the outer frame 2 at predetermined intervals. As shown in FIG. 3 (b), the lower chord 9 of the roof frame 4 extending in the direction of connecting the pair of outer frames 2 is a tension chord, and the lower chord 9, the first bundle 11 and the first chord 11 are formed. The first bundle member 11 is fixed to a lower end surface of the lower chord member 9 functioning as a tension string member in the vicinity of an intermediate portion of the lower chord member 9 in a pair with a predetermined spacing via fixing means. . The first tension members 12 are arranged so as to connect the four side portions 4a of the roof frame 4 and the four protruding ends of the pair of first bundle members 11.
[0016]
In the present embodiment, as shown in FIG. 3A, the first tension member 12 is bifurcated from the first bundle member 11 toward the side portion 4a of the roof frame 4. Therefore, the first tension member 12 is configured to support two points on both sides 4a of the roof frame 4 at both ends.
FIG. 3B shows a pair of the first bundle member 11, the lower chord member 9 functioning as a string member of the first beam string frame 10, and the first tension member 12. As described above, the diagonal member 24 is attached for the purpose of preventing the pair of first bundle members 11 from being bent.
[0017]
The first chord beam frame 10 having such a configuration is configured such that, when an appropriate tension is applied to the first tension member 12, the lower chord member 9 functioning as a chord member via the first bundle 11 An upward reaction force can be applied. Therefore, as shown in FIG. 3A, by arranging the plurality of first string beams 10 in parallel in the longitudinal direction of the outer frame 2 so as to be parallel, a substantially rectangular area of the roof frame 4 is provided. Since the upward reaction force can be applied to the entire A, the member stress in the region A of the roof frame 4 can be reduced, and thus the deformation of the roof frame 4 that is likely to be caused by the application of the vertical load is suppressed. Is what you can do.
[0018]
On the other hand, as shown in FIG. 4A, a second string string frame 13 is constructed in a substantially fan-shaped region B of the roof frame 4, and these are composed of a tension ring 14 and a rigid body. 2, a second bundle member 15, a second tensile member 16, and a stiffening member 17. As shown in FIG. 4B, the tension ring 14 is disposed below substantially the center of the area B of the roof frame 4, and the lower chord 9 of the roof frame 4 is fastened by the second bundle 15. More supported.
The second tension member 16 has one end fixed to the outer peripheral edge of the tension ring 14 and the other end fixed near the outer peripheral edge of the area B of the roof frame 4. As shown in FIG. 5, these second tensile members 16 are provided with four tensile action areas C provided on the tension ring 14. ₁ From each, a plurality are arranged so as to extend radially, and the tensile action area C ₁ And the number of the second tension members 16 may be any as long as a uniform outward tension can be applied to the tension ring 14 and a predetermined amount of tension can be secured.
[0019]
Further, a plurality of stiffening members 17 are provided inside the tension ring 14. These are intended to resist the excessive outward pulling force acting on the tension ring 14 by applying the tension, and to stiffen the deformation so as to suppress the deformation of the tension ring 14. In the present embodiment, five connection points C are provided on the inner peripheral surface of the tension ring 14. ₂ Are arranged, and the connection point C ₂ The five stiffening members 17 are arranged so as to form a star shape in a plan view via. However, the arrangement and the number of the stiffening members 17 are not limited to this, and at least a portion where there is a high possibility that an excessive outward tensile force acts on the tension ring 14, that is, the tensile action region C ₁ Connection point C near ₂ And the connection point C ₂ Any arrangement position and number of the tension rings 14 may be used as long as a tension force having a uniform magnitude can be generated in the center point direction O of the tension rings 14 using the above. .
[0020]
The second beam string frame 13 having such a configuration is provided with an appropriate tension to the second tension member 16, whereby the roof frame 4 has a substantially fan-shaped shape via the second bundle member 15. Since the upward reaction force can be applied to the entire area B, the member stress in the area B of the roof frame 4 can be reduced, and thus the deformation of the roof frame 4 that is likely to be caused by the application of a vertical load is suppressed. Is what you can do.
Therefore, the roof frame 4 is divided into regions having a characteristic plan view shape, such as a substantially rectangular region A and a fan-shaped region B, and the beam string having a configuration effective for each shape. By providing a frame, it is possible to reduce the member stress of the entire roof frame 4 against a vertical load such as its own weight or a snow load, and to construct a safe structure that is unlikely to be deformed. is there.
[0021]
Further, the roof frame 4 described above is provided with a skeletal frame 18 on the first beam string frame 10 in addition to the first beam string frame 10 and the second beam string frame 13 to form the roof frame 3. ing. As shown in FIG. 3B, the skeletal frame 18 is composed of a first cord 19 and a second cord 20, and functions as a string in the first beam string frame 10. It is arranged so as to connect the lower chord material 9 of the roof frame 4 and the outer peripheral frame 2. Specifically, the first cord-like member 19 has one end at one end of the lower chord material 9 and the other end with the lower chord material 9 and the first bundle adjacent to one end of the lower chord material 9. The second cord 20 is connected to a joint point with the member 11 in a loose state, and the second cord 20 is supported at an intermediate portion of the first cord 19 and one end of the lower chord 9. It is arranged so as to connect the lower part of the outer peripheral frame 2 on the side where it is located.
In these, the first cord 19 is tensioned by applying tension to the second cord 20, and accordingly, one end of the string 9 is fixed in its original position, and the earthquake occurs. One end of the string member 9 maintains the original position even when a horizontal load such as wind or wind is applied. Therefore, by providing the same skeletal frame 18 as described above also at the other end of the tension member 9, the roof frame 4 has a structure having appropriate rigidity against horizontal load.
[0022]
As described above, a method of constructing the roof frame 3 including the first beam string frame 10, the second beam string frame 13, and the skeletal frame 18 on the roof frame 4 will be described below with reference to FIGS. Will be described in detail.
[0023]
In the first step, as shown in FIG. 6, a pair of an outer frame 2 and a roof frame 4 constituting the structure 1 are constructed.
First, a pair of outer frames 2 constituting the structure 1 are constructed, and a roof frame 4 having a flat space truss structure is laid. In addition, in the present embodiment, the outer peripheral frame 2 is constructed in the same flat-type three-dimensional truss structure as the roof frame 4, but is not necessarily limited to this, and has a configuration capable of supporting the roof frame 4. Any of them may be used.
[0024]
Next, the first pair of beam strings provided on the first chord beam frame 10 at a predetermined distance from the middle portion of the lower chord member 9 in the direction of connecting the pair of outer frames 2 in the area A of the roof frame 4. The bundle material 11 is fixed via fixing means so as to extend vertically downward. Note that the pair of first bundle members 11 may be configured such that fixing means is fixed to the lower chord member main body 9a when the roof frame 4 is constructed.
[0025]
Next, a tension ring 14 is positioned substantially below the region B of the roof frame 4 at a substantially central portion, and the lower chord material 9 of the roof frame 4 and a plurality of second bundles 15 are attached to the upper edge of the tension ring 14. Connect via Further, a plurality of tension action regions C provided on the outer peripheral surface of the tension ring 14 are provided. ₁ One end of each of the plurality of second tension members 16 is fixed to the vicinity of each of the plurality of second tension members 16 via fixing means. ₁ The other end is fixed to the outer peripheral edge of the roof frame 4 via fixing means so as to extend radially around the center.
A plurality of stiffening members 17 are attached to the tension ring 14 in advance.
[0026]
Thereafter, as shown in FIG. 6A, the area A of the roof frame 4 is supported by the first temporary supports 21, 21a, the area B and the tension ring 14 by the second temporary supports 22, 22a. Then, it is built on the upper part of the outer peripheral frame 2. At this time, the second tension member 16 is slackened without applying tension. The lower chord 9 in the direction of connecting the pair of outer frame members 2 has the first temporary strut 21 disposed on both sides and the first temporary strut 21a disposed at an intermediate portion of the lower chord 9 and has three points. Support with. The second temporary support 22 is located at a position that supports both the region B and the tension ring 14, and the second temporary support 22 a is located at a position that supports only the roof frame 4 at the central portion inside the tension ring 14. Deploy.
[0027]
In the second step, a first beam string frame 10 and a second beam string frame 13 are constructed on the roof frame 4.
First, as shown in FIG. 6B, in the region B of the roof frame 4, only the tension ring 14 is opened from the second temporary support 22, and a plurality of second tension members 16 are not shown. The step of simultaneously and simultaneously introducing a predetermined amount of tension using a hydraulic jack is repeated a plurality of times with a stepwise amount of tension. The hydraulic jack is for automatically controlling tension management.
Thereafter, the second temporary support 22a that supports only the region B at the inner central portion of the tension ring 14 is jacked down, and the tension on the second tension member 16 is further increased. By opening the roof frame 4 almost simultaneously from the plurality of first temporary columns 21 supporting the second beam, the second beam string frame 13 is constructed on the roof frame 4 as shown in FIG. Then, all the second temporary columns 22 are removed.
[0028]
Next, as shown in FIG. 6C, in the area A of the roof frame 4, a roof frame to which the protruding end portions of the paired first bundle members 11 and both end portions of the lower chord member 9 are connected. The plurality of first tension members 12 are fixed via fixing means so as to connect the outer peripheral edges of the four. At this time, as the first tensile member 12, a member length that does not cause bending of the first bundle member 11 is used, and no tension is introduced. At this time, with respect to the first tension member 12, the first tension member 12a connecting the outer peripheral edge of the roof frame 4 and the first bundle member 11 does not cause the first bundle member 11 to be bent. For the purpose, instead of applying tension, a tensioned state is secured by length management, and a turnbuckle is provided on the first tension member 12b connecting between the pair of first bundle members 11. Be prepared.
[0029]
Next, a step of introducing a predetermined amount of tension into the first tension member 12b connecting the pair of first bundle members 11 using a turnbuckle (not shown) is repeated a plurality of times with a stepwise tension amount.
When introducing tension into these first tensile members 12b, first, as shown in FIG. ₁ , A predetermined amount of tension is introduced, the strain gauge 23a fixed in advance is monitored, and the amount of torque to be applied to the turnbuckle required to introduce the predetermined amount of tension is determined. At this time, the torque value is set at an interval of 1 to 0.1 tf · cm. According to the determined torque value, the second HS to the sixth HS located at the central portion ₆ Until a predetermined amount of tension is introduced. After this, the sixth HS located in the center ₆ After monitoring the strain gauge 23b previously fixed to the first tensile member 12b, and confirming whether the introduced tension is within the control tolerance, one by one also to the remaining first tensile member 12b. Introduce tension in order. Last HS ₁₁ After introducing tension until the end, ₁₁ The strain gauge 23c fixed in advance to the first tensile member 12 is monitored to confirm whether the tension introduced again is within the control tolerance. Such work is repeated a plurality of times while gradually increasing the amount of tension to be introduced, and the necessary tension is introduced into the first tensile member 12b.
The turnbuckle provided on the first tension member 12b connecting the pair of first bundle members 11 is similar to a commonly used one, and introduces tension by rotating a torque wrench. It has a configuration that can be used.
[0030]
Thereafter, the first temporary support 21a supporting the intermediate portion of the lower chord 9 in the direction of connecting the pair of outer frames 2 is jacked down, and the tension of the first tension member 12b is further increased. Thereafter, the lower chord members 9 in the direction of connecting the pair of outer frames 2 are substantially simultaneously transferred from the first temporary struts 21 supporting both side portions of the lower chord member 9 in the direction of connecting the pair of outer frame members 2. By opening, as shown in FIG. 6 (d), the first beam string frame 10 is constructed on the roof frame 4, and all the first temporary columns 21 are removed.
[0031]
In the third step, as shown in FIG. 7, the first temporary columns 21 and 21a are removed, and the skeletal frame 18 is constructed on the roof frame 4 supported only by the outer peripheral frame 2.
First, one end of the lower chord member 9 functioning as a string member in the first chord beam frame 10, and the first bundle member 11 and the lower chord member 9 adjacent to one end of the lower chord member 9. The first cable member 19 is fixed via fixing means so as to connect both of the contact points, and the intermediate portion of the first cable member 19 and the lower portion of the outer frame 2 are connected. The second cord 20 is fixed via fixing means.
[0032]
Next, as shown in FIG. 7A, the first CB ₁ Third CB from ₃ , A predetermined amount of tension is introduced by holding a hydraulic jack (not shown) as a set of the three second cord members 20. Next, as shown in FIG. 7B, the third CB ₃ 5th CB from ₅ Are set as a set, and a predetermined amount of tension is introduced by holding a hydraulic jack to these sets. As described above, when the tension is to be introduced into the new second cord-like material 20, a set is formed including the adjacent second cord-like material 20 to which the tension has already been introduced, and a pair is formed. At the same time, a predetermined amount of tension is introduced.
In the present embodiment, a predetermined amount of tension is introduced as a set of three pieces, but the present invention is not limited to this, and any number may be set as one set.
[0033]
In this way the final CB _end The process of introducing tension until the required tension is repeated several times while gradually increasing the amount of tension to be introduced. In the present embodiment, the step of introducing the tension is a procedure through five steps of 30, 60, 80, 90, and 100% of the required tension, but the step is not necessarily limited to this.
[0034]
In the fourth step, as shown in FIG. 7C, for the purpose of preventing bending of the pair of first bundle members 11 constituting the first beam string frame 10, the paired first bundle members 11 are prevented from bending. The diagonal member 24 is attached to the surface of the structure composed of the bundle member 11, the lower chord member 9 functioning as the string member of the first string string frame 10, and the first tension member 12.
[0035]
According to the above-described steps, the roof frame 3 including the first string string frame 10, the second string string frame 13, and the skeletal frame 18 is installed on the roof frame 4 above the pair of outer frame frames 2. Then, various facility works and the like are performed, and the structure 1 is constructed.
[0036]
According to the above-described configuration, the roof frame 3 is a second beam string frame using the linear first string beam frame 10 having a plurality of bundles and the tension ring 14 on the roof frame 4 having a flat space truss structure. 13 and a skeletal frame 18. This makes it possible to reduce the member stress of the entire roof frame 4 with respect to a vertical load such as its own weight or a snow load, and it is possible to construct the roof frame 3 having a safe structure that does not easily deform. Even when a horizontal load such as an earthquake or wind is applied, the roof frame 4 can be securely fixed to a predetermined position of the outer peripheral frame 2, and the roof frame 3 having appropriate rigidity against the horizontal load can be constructed. It becomes.
[0037]
Since the first beam string frame 10 is provided with the diagonal member 24 for preventing the first bundle member 11 from being easily bent, the first string member frame 10 is capable of retaining the first string member even when the vertical load such as excessive own weight or snow load is applied. Of the roof string 4 can effectively reduce the member stress of the roof frame 4 as a whole.
[0038]
The roof frame 3 was constructed by constructing a first straight string beam frame 10 having a plurality of bundles in a rectangular area A in plan view, and a second string string frame 13 using a tension ring 14 in a fan-shaped area B in plan view. Accordingly, by providing a beam string frame having an effective configuration to each shape, it is possible to effectively reduce the member stress of the entire roof frame 4 with respect to a vertical load such as its own weight or a snow load by a simple configuration. Becomes possible.
[0039]
The method of constructing the roof frame 3 is such that in the installation step of the skeletal frame 18, tension is introduced by setting a plurality of the second cord-like members 20 as a set, and a new set has an adjacent tension introduced. The step of introducing tension including the second cord 20 is sequentially repeated. Thereby, in the step of sequentially introducing tension to the plurality of second cable members 20 arranged in parallel, the second cable member after tension introduction adjacent to the second cable member 20 under tension introduction. The influence on the amount of tension applied to the second cable 20 can be minimized, and the intended tension can be easily applied to the second cable member 20 with high accuracy. It is possible to contribute and to easily ensure the design quality.
[0040]
【The invention's effect】
According to the method of constructing a roof frame according to any one of claims 1 to 3, a pair of outer frames arranged so as to face each other with a predetermined separation interval are provided, and both ends are supported by the outer frames. A method for constructing a roof frame of a structure comprising a roof frame having a roof frame having a flat space truss structure and a pair of outer frames facing each other with a predetermined separation interval. A lower chord member of the roof frame extending in a direction connecting the pair of outer frame structures to the roof frame, a first bundle member disposed in a pair at an intermediate position between the lower chord members, and protruding vertically downward; After attaching a first stringed beam frame made of a first tension member connecting a tip end portion of the first bundle member and both end portions of the lower chord member forming a pair, the roof frame is attached to a first temporary column. In the state of being supported, on the outer frame A second step of introducing the desired tension into the first tension member, and then removing the first temporary support from the roof frame; and attaching the lower chord member to the roof frame. The first cable member connecting one end and a joint of the first bundle member and the lower chord member disposed near one end of the lower chord member, and an intermediate portion of the first cable member And a skeletal frame made of a second cord-shaped member connecting the lower string member and a lower portion of the outer frame supporting one end of the lower string member, and attached to both ends of the first string member frame in pairs, and It is constructed by a third step of introducing tension to the second cord so that the first cord is tensioned, and in the third step, the tension is applied to the second cord in the next step. After a predetermined amount of tension is introduced as a set of the predetermined number of second cords that match each other, At the adjacent, already combined second cord-like member embodying the tensioning, a set of a predetermined second number of cord-like material, sequentially repeating the step of performing the tensioning of a predetermined amount.
[0041]
Alternatively, in the first step, the pair of outer frames is constructed so as to expand stepwise from the intermediate portion to one end, and the roof frame is located in a region where the separation interval is stepwise expanded. A tension ring, a plurality of second bundles for hanging the tension ring from a lower chord of the roof frame, and a second bundle extending radially from an outer peripheral surface of the tension ring and connected to an outer peripheral edge of the roof frame. A second stringer beam frame made of a string member is attached, the second stringer beam frame and the roof frame are supported by a second temporary column, and after the first step, the second stringer beam frame is separated from the second temporary column. After the second string is tensioned after being opened, the second temporary support is removed from the roof frame, and the second step is performed.
[0042]
Alternatively, after the third step, as a fourth step, a diagonal member is constructed in a region surrounded by the first bundle member, the string member, and the first tension member that form a pair forming the first beam string frame. I do.
[0043]
Accordingly, in the step of sequentially introducing tension to the plurality of second cords arranged in parallel constituting the skeletal frame, the second cord after the introduction of the tension adjacent to the second cord being tensioned is introduced. The effect on the amount of tension on the cords can be minimized, and the intended tension can be easily applied to the second cords with high accuracy, reducing the cost and shortening the construction period. , And design quality can be easily ensured.
[Brief description of the drawings]
FIG. 1 is a view schematically showing a roof frame according to the present invention.
FIG. 2 is a view showing details of an outer peripheral frame and a roof frame constituting the roof frame according to the present invention.
FIG. 3 is a view showing details (No. 1) of a roof frame according to the present invention.
FIG. 4 is a view showing details (part 2) of a roof frame according to the present invention.
FIG. 5 is a view schematically showing a tension ring of a roof frame according to the present invention.
FIG. 6 is a view showing a method of constructing a first beam string frame and a second beam string frame constituting a roof frame according to the present invention.
FIG. 7 is a diagram showing a method of constructing a skeletal frame constituting the roof frame according to the present invention.
FIG. 8 is a diagram showing a plan view of the roof frame according to the present invention.
[Explanation of symbols]
1 structure
2 outer frame
3 roof frame
4 Roof frame
5 Strings
6 Diagonal lumber
7 Hub
8 Upper chord material
8a Upper chord material
9 Lower chord material
9a Lower chord material
10 First beam string frame
11 First bundle material
12 First tensile material
13 Second beam string frame
14 tension ring
15 Second bundle
16 Second tensile material
17 Stiffening members
18 Skelsion frame
19 First cord material
20 Second cord material
21 First Temporary Prop
22 Second temporary support
23a strain gauge
23b strain gauge
23c strain gauge
24 Diagonal lumber

Claims

A method for constructing a roof frame of a structure comprising: a pair of outer frames arranged so as to face each other at a predetermined separation interval; and a roof frame arranged so that both ends are supported by the outer frames. ,
A pair of outer frames are constructed so as to face each other at a predetermined separation interval, a roof frame having a flat space truss structure is laid, and a roof extending in a direction in which the pair of outer frames is connected to the roof frame. A lower chord of the frame, a first bundle that is arranged in a pair at an intermediate position between the lower chords, and protrudes vertically downward, a tip end of the first bundle that forms a pair, and both ends of the lower chord A first stringing frame consisting of a first tension member connecting the parts, and a first step of building the roof frame on the upper part of the outer peripheral frame while supporting the roof frame on the first temporary column. ,
A second step of removing the first temporary support from the roof frame after introducing a desired tension into the first tension member;
The first cord-shaped member connecting the one end of the lower chord material and a joint point of the first bundled material arranged near the one end of the lower chord material with the lower chord material, to the roof frame; A skeletal frame made of a second cord connecting the intermediate portion of the first cord and the lower part of the outer frame supporting one end of the lower chord is attached to both ends of the first chord frame. And a third step of introducing tension into the second cord so that at least the first cord is tensioned,
In the third step, in order to introduce tension into the second cord-like material, a predetermined amount of tension is introduced using a predetermined number of adjacent second cord-like materials as a set, and then a plurality of new neighboring cord-like materials are introduced. By combining the second cord and the second cord adjacent thereto and having already been subjected to tension introduction, a set of a prescribed number of second cords is provided, and a prescribed amount of tension is introduced. A method for constructing a roof frame, wherein the steps are sequentially repeated.

The method for constructing a roof frame of a structure according to claim 1,
In the first step, a pair of outer frames is constructed so as to expand stepwise from the intermediate portion toward one end, and the roof frame located in a region where the separation interval is stepwise expanded, A tension ring, a plurality of second bundles for suspending the tension ring from a lower chord of the roof frame, and a second chord extending radially from an outer peripheral surface of the tension ring and connected to an outer peripheral edge of the roof frame. A second stringer frame structure is attached, and the second stringer frame and the roof frame are supported by second temporary columns.
After the first step, after opening the second beam string frame from the second temporary column and tensioning the second string member, the second temporary column is removed from the roof frame, and the second step is performed. A method of constructing a roof frame.

The method for constructing a roof frame of a structure according to claim 1 or 2,
After the third step, as a fourth step, constructing a diagonal member in a region surrounded by the pair of the first bundle member, the string member, and the first tension member that constitute the first beam string frame. A method for constructing a roof frame characterized by the following.