JP2004269093A

JP2004269093A - Overhead traveling crane

Info

Publication number: JP2004269093A
Application number: JP2003059551A
Authority: JP
Inventors: Kazutaka Kato; 一隆加藤; Yasushi Haruta; 靖春田; Shinichi Masumoto; 伸一舛元
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2003-03-06
Filing date: 2003-03-06
Publication date: 2004-09-30

Abstract

<P>PROBLEM TO BE SOLVED: To decrease a moment applied to a girder of an overhead traveling crane, and to reduce the weight of the overhead traveling crane and a building structure. <P>SOLUTION: The girder 2 of the overhead traveling crane 1 is structured to be slightly bent upward in a center portion in advance so as to be generally horizontal when a hook 4 hangs a cargo and a load 8 is applied. The girder 2 is often structured by a pair of two girders. In that case, a hoisting/lowering device 6 and the hook 4 are disposed between the two girders 2, and any other device except for traveling wheels 3 is not provided on lower surfaces of the girders 2. Load supporting means 10 having specified length are provided on a generally both end portions lower surface of the girder 2, and the load supporting means 10 are coupled with each other by wire rope 11 as a load adding means. The wire rope 11 is provided with a turnbuckle 12 as a load adjusting means so as to adjust length. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、建屋内に設置された天井走行クレーンに関する。
【０００２】
【従来の技術】
図６は従来の技術に係る天井走行クレーンを備えた建屋の断面図である。
【０００３】
図６において、建屋５０内の上部に、柱５１に取付けられた天井走行クレーン１が走行するためのレール２０ａ、２０ｂを支える横梁５３ａ、５３ｂが対に設けられている。天井走行クレーン１は、主構造物である桁２と、桁２の最両端下部に建屋のレール２０ａ、２０ｂ上を走行するための走行車輪３と、桁２に支持された横行用の横行レール５と、横行レール５に支持されて荷を昇降するフック４を有する昇降装置６と、昇降装置６に設けられた横行レール上を横行するための横行車輪７と、を有している。
【０００４】
建屋５０内の荷を昇降装置６にて吊り上げた場合に、荷の重量は昇降装置６に掛かり、天井走行クレーン１の桁２には荷の重量と昇降装置６の重量とを合わせた加重重量が掛かり、桁２は撓み、桁２に加重重量による曲げモーメントが発生する。この曲げモーメントによる撓み量には許容限界があり、桁２の重量を増やさない為に高さを大きくする等の設計がなされる（例えば、特許文献１参照。）。また、建屋５０の横梁５３と柱５１には荷と昇降装置６と桁２との重量を合わせた総重量が掛かる。
【０００５】
【特許文献１】
特開平８−９２５８９号公報（図１及び第１項段落番号〔０００３〕）
【０００６】
【発明が解決しようとする課題】
桁２の撓み量に主として影響を与えるものは、荷の重量と昇降装置６の重量とを合わせた加重重量による曲げモーメントであり、桁２に掛かる曲げモーメントを減少させることができれば、桁２の撓み量を減少させ、桁２の構造を小さくすることができる。また、建屋には、荷の重量と昇降装置６の重量と更に桁２の重量との総重量が掛かるので、桁２の構造が小さくなれば天井走行クレーンの重量が減少し、天井走行クレーンを支持する建屋の所要強度を小さく設計することができ、建屋の構造を軽量化させることができる。建屋の構造を軽量化させることは、天井走行クレーンの軽量化より遥かに経済的に有効である。
【０００７】
本発明は、天井走行クレーンの桁に掛かるモーメントを減少させる手段を提供し、天井走行クレーン及び建屋の構造を軽量化することを課題としたものである。
【０００８】
【課題を解決するための手段】
上記課題を解決するために、請求項１に記載の本発明は、建屋内の上部に設置された複数の横梁と、前記横梁に支持された対の走行レールと、前記走行レールに跨って前記走行レール上を走行する走行車輪を有する桁と、前記桁に支持された横行レールと、前記横行レールに支持され桁の長手方向に横行し荷を昇降させる横行車輪を有する昇降手段と、を有する天井走行クレーンにおいて、前記桁の両端部に設けられた対の荷重支持手段と、対の前記荷重支持手段を連結した荷重付加手段、とを備えたことを特徴とする。
【０００９】
上記構成によれば、天井走行クレーンの桁の両端部に設けられた対の荷重支持手段を連結した荷重付加手段によって荷重支持手段に荷重を付加することにより、桁に曲げモーメントを付加することができる。荷重支持手段と荷重付加手段とによる曲げモーメントは、荷を昇降手段にて吊り下げた場合に桁に働く曲げモーメントと逆の方向に働くように、桁に付加される。従って、荷の重量による天井走行クレーンに働く曲げモーメントを減少させ、発生応力が減少するので、桁の部材を小さく作ることができる。天井走行クレーンの桁の部材が小さくなると天井走行クレーンの重量が減少し、従って、建屋に掛かる荷重も減少し、建屋の部材も小さくすることができる。
【００１０】
天井走行クレーンの桁の最端部には横行車輪があり、建屋の梁等の構造物とも干渉することがあって、荷重支持手段は桁の最端部より比較的中央よりに設ける場合があるが、本発明の技術的範囲であることは言うまでもない。
【００１１】
上記課題を解決するために、請求項２に記載の本発明は、請求項１に記載の本発明において、前記桁の両端部の下部に設けた対の前記荷重支持手段を前記荷重付加手段で連結し、対の前記荷重支持手段の距離が近づく方向に前記荷重付加手段が対の前記荷重支持手段に荷重をかけて曲げモーメントを前記桁に付加するように備えたことを特徴とする。
【００１２】
上記構成によれば、昇降手段が桁の上を横行する場合、桁の両端部の底面より更に下方に対の荷重支持手段をはみ出させて桁の下部に設け、その荷重支持手段のはみ出した部分を荷重付加手段で連結し、荷重支持手段がお互いに引き合うように荷重付加手段により荷重をかけ、桁にモーメントを付加させることができる。下方にはみ出すはみ出し寸法は長いほど桁に付加するモーメントが大きくなるが、吊荷との干渉も考慮して寸法が決定される。
【００１３】
上記課題を解決するために、請求項３に記載の本発明は、請求項１に記載の本発明において、前記桁の両端部の上部に設けた対の前記荷重支持手段を前記荷重付加手段で連結し、対の前記荷重支持手段の距離が離れる方向に前記荷重付加手段が対の前記荷重支持手段に荷重をかけて曲げモーメントを前記桁に付加するように備えたことを特徴とする。
【００１４】
上記構成によれば、昇降手段が桁の下に設置されたレールにぶら下がって横行する場合には、桁の両端部の上面より更に上方に対の荷重支持手段をはみ出させて桁の上部に設け、その荷重支持手段のはみ出した部分を荷重付加手段で連結し、荷重支持手段がお互いに反発し合うように荷重付加手段により荷重をかけ、桁にモーメントを付加させることができる。昇降手段が桁の上にあっても、桁の下に装置が付加できない場合には、桁の上部に荷重支持手段と荷重付加手段を設けることが有効である。
【００１５】
上記課題を解決するために、請求項４に記載の本発明は、請求項２に記載の本発明において、前記荷重付加手段がワイヤーロープ又はバーを有することを特徴とする。
【００１６】
上記構成によれば、荷重支持手段を荷重付加手段で連結し、荷重支持手段がお互いに引き合うように荷重付加手段により荷重をかけるに最適なワイヤーロープ又はバーを使用して、桁にモーメントを付加させることができる。ワイヤーロープ又はバーには張力が働く。
【００１７】
上記課題を解決するために、請求項５に記載の本発明は、請求項３に記載の本発明において、前記荷重付加手段が流体圧シリンダ又はバーを有することを特徴とする。
【００１８】
上記構成によれば、荷重支持手段を荷重付加手段で連結し、荷重支持手段がお互いに反発し合うように荷重付加手段により荷重をかけるに最適な流体圧シリンダ又はバーを使用して、桁にモーメントを付加させることができる。流体圧シリンダ又はバーには圧縮力が働く。流体圧シリンダには流体として水、油、空気等が使用できる。
【００１９】
上記課題を解決するために、請求項６に記載の本発明は、請求項１乃至５のいずれかに記載の本発明において、前記荷重付加手段が前記荷重支持手段に付加する荷重を調整させる荷重調整手段を備えたことを特徴とする。
【００２０】
上記構成によれば、桁に掛かるモーメントを調整することができる。特にワイヤーロープを使用した場合に、ワイヤーロープの経年変化による伸びを再調整して、常に最適な張力を維持することにより、桁に掛かるモーメントを定常に維持することが出来る。また、流体圧シリンダの流体圧を調整することにより、桁に掛かるモーメントを自在に調整することもできる。荷重調整手段は流体圧シリンダあるいはターンバックル、機械ねじ等を使用することができる。桁に掛かる応力あるいは荷重付加手段の張力／圧縮力等を計測し、その計測値に基いて自動的に荷重調整手段を調整制御することも可能である。
【００２１】
【発明の実施の形態】
以下、本発明の実施の形態を図に従って詳細に説明する。図１は本発明の第１の実施の形態に係る天井走行クレーンの桁断面摸式図を示す。図２は本発明の第２の実施の形態に係る天井走行クレーンの桁断面摸式図を示す。図３は本発明の第３の実施の形態に係る天井走行クレーンの桁断面摸式図を示す。図４は図１及び図２に係るモーメント荷重図を示す。図５は図３に係るモーメント荷重図を示す。なお、図１乃至図６において、同じ構成の部分には同一の符号を付し、それらについての重複する説明は省略する。
【００２２】
（本発明の第１の実施の形態）
図１において、天井走行クレーン１の桁２は、フック４で荷を吊って荷重８が掛かった場合に略水平になるように、予め中央部は若干上に屈曲した構造となっている。桁２は２本対で構成される場合が多く、その場合は、２本の桁２の間に昇降装置６とフック４が配置され、桁２の下面には走行車輪３以外の装置は設けられていない。桁２の略両端部下面に所定の長さを有する荷重支持手段１０を設け、その荷重支持手段１０を荷重付加手段であるワイヤーロープ１１で互いに連結されている。ワイヤーロープ１１には長さが調整できるように荷重調整手段であるターンバックル１２が設けられている。
【００２３】
図４に、図１の天井走行クレーン１の昇降手段６が荷を吊上げ、桁２の中央部に位置した場合の曲げモーメント３１を示す。桁２は支持点３０で支持されており、曲げモーメントの大きさと方向は、荷量が桁２に掛かる方向を支持点３０より下向きに示す。曲げモーメント３１は桁２の中央部が下向きに最大となり、その最大曲げモーメントは桁２の中央部で３４で示されている。
【００２４】
しかしながら、ワイヤーロープ１１の長さをターンバックル１２で調整し、ワイヤーロープ１１に引張力を付加すると、荷重支持手段１０に引張荷重１６が付加される。引張荷重１６により、荷重支持手段１０を介して曲げモーメント３２が桁２に曲げモーメント３１と逆の方向に付加され、桁２には曲げモーメント３１と曲げモーメント３２を加えた曲げモーメント３３が実負荷として掛かる。曲げモーメント３３の最大曲げモーメントは３５に示されるように、最大曲げモーメント３４に比較して曲げモーメント３２の分だけ減少することとなる。
【００２５】
図１に示す荷重調整手段であるターンバックル１２はワイヤーロープ１１に引張荷重１６を付加できればよく、ターンバックル１２の代わりに荷重支持手段１０又は桁２にワイヤーロープ１１を引張する他の荷重調整手段を設けても、あるいはワイヤーロープ１１の代わりに棒状のバーを使用しても、本発明の技術的範囲であることは言うまでもない。
【００２６】
（本発明の第２の実施の形態）
図２において、天井走行クレーン１の桁２は、フック４で荷を釣って荷重８が掛かった場合に略水平になるように、予め中央部は若干上に屈曲した構造となっている。桁２は２本対で構成される場合が多く、その場合は、２本の桁２の間に昇降装置６とフック４が配置され、桁２の下面には走行車輪３以外の装置は設けられていない。桁２の略両端部上面に所定の長さを有する荷重支持手段１０を設け、その荷重支持手段１０を荷重付加手段であるバー１４と荷重調整手段である油圧シリンダ１５で互いに連結されている。
【００２７】
本発明の第１の実施の形態と同様に、図４に、図２の天井走行クレーン１の昇降手段６が荷を吊上げ、桁２の中央部に位置した場合の曲げモーメント３１を示す。桁２は支持点３０で支持されており、曲げモーメントの大きさと方向は、荷量が桁２に掛かる方向を支持点３０より下向きに示す。曲げモーメント３１は桁２の中央部が下向きに最大となり、その最大曲げモーメントは桁２の中央部で３４で示されている。
【００２８】
しかしながら、油圧シリンダ１５の長さを調整し、バー１４に圧縮力を付加すると、荷重支持手段１０に圧縮荷重１７が付加される。圧縮荷重１７により、荷重支持手段１０を介して曲げモーメント３２が桁２に曲げモーメント３１と逆の方向に付加され、桁２には曲げモーメント３１と曲げモーメント３２を加えた曲げモーメント３３が実負荷として掛かる。曲げモーメント３３の最大曲げモーメントは３５に示されるように、最大曲げモーメント３４に比較して曲げモーメント３２の分だけ減少することとなる。
【００２９】
図１に示す荷重調整手段である油圧シリンダ１５は荷重支持手段１０に圧縮荷重１７を付加できればよく、油圧シリンダ１５の代わりに荷重支持手段１０を圧縮する他の荷重調整手段を設けても、あるいは油圧シリンダ１５の代わりにバー１４のみを使用しても、また、バー１４の代わりに油圧シリンダ１５のみを使用しても本発明の技術的範囲であることは言うまでもない。
【００３０】
（本発明の第３の実施の形態）
図３において、天井走行クレーン１の桁２は、フック４で荷を釣って荷重８が掛かった場合に略水平になるように、予め中央部は若干上に屈曲した構造となっている。桁２は２本対で構成される場合が多く、その場合は、２本の桁２の間に昇降装置６とフック４が配置されている。天井走行クレーン１の配置上、桁２の略両端部下面に障害物があり、比較的大きな荷重支持手段１０を設けることが不可能な場合、比較的小さな荷重支持手段１０を設け、更に、本発明の第１の実施の形態に加えて、桁２の略中央部下面に荷重付加補助手段１３が設けられている。
【００３１】
図５に、図３の天井走行クレーン１の昇降手段６が荷を吊上げ、桁２の中央部に位置した場合の曲げモーメント３１を示す。桁２は支持点３０で支持されており、曲げモーメントの大きさと方向は、荷量が桁２に掛かる方向を支持点３０より下向きに示す。曲げモーメント３１は桁２の中央部が下向きに最大となり、その最大曲げモーメントは桁２の中央部で３４で示されている。
【００３２】
しかしながら、ワイヤーロープ１１の長さをターンバックル１２で調整し、ワイヤーロープ１１に引張力を付加すると、荷重支持手段１０に引張荷重１６が付加される。引張荷重１６により、荷重付加補助手段１３が上方に持ち上げられ、その突上荷重１８により、荷重付加補助手段１３を介して曲げモーメント３２が桁２に曲げモーメント３１と逆の方向に付加され、桁２には曲げモーメント３１と曲げモーメント３２を加えた曲げモーメント３３が実負荷として掛かる。曲げモーメント３３の最大曲げモーメントは３５に示されるように、最大曲げモーメント３４に比較して曲げモーメント３２の分だけ減少することとなる。
【００３３】
図３に示す荷重調整手段であるターンバックル１２はワイヤーロープ１１に引張荷重１６を付加できればよく、ターンバックル１２の代わりに荷重支持手段１０又は桁２にワイヤーロープ１１を引張する他の荷重調整手段を設けても、あるいはワイヤーロープ１１の代わりに棒状のバーを使用しても、本発明の技術的範囲であることは言うまでもない。
【００３４】
【発明の効果】
以上説明したように、請求項１の本発明によれば、荷の重量による天井走行クレーンに働く曲げモーメントを減少させ、発生応力が減少するので、桁の部材を小さく作ることができる。天井走行クレーンの桁の部材が小さくなると天井走行クレーンの重量が減少し、従って、建屋に掛かる荷重も減少し、建屋の部材も小さくすることができる。
【００３５】
また、請求項２の本発明によれば、桁の両端部の底面より更に下方に対の荷重支持手段をはみ出させて桁の下部に設け、その荷重支持手段のはみ出した部分を荷重付加手段で連結し、荷重支持手段がお互いに引き合うように荷重付加手段により荷重をかけ、桁にモーメントを付加させることができる。
【００３６】
また、請求項３の本発明によれば、桁の両端部の上面より更に上方に対の荷重支持手段をはみ出させて桁の上部に設け、その荷重支持手段のはみ出した部分を荷重付加手段で連結し、荷重支持手段がお互いに反発し合うように荷重付加手段により荷重をかけ、桁にモーメントを付加させることができる。昇降手段が桁の上にあっても、桁の下に装置が付加できない場合には、桁の上部に荷重支持手段と荷重付加手段を設けることが有効である。
【００３７】
また、請求項４の本発明によれば、荷重支持手段を荷重付加手段で連結し、荷重支持手段がお互いに引き合うように荷重付加手段により荷重をかけるに最適なワイヤーロープ又はバーを使用して、桁にモーメントを付加させることができる。
【００３８】
また、請求項５の本発明によれば、荷重支持手段を荷重付加手段で連結し、荷重支持手段がお互いに反発し合うように荷重付加手段により荷重をかけるに最適なシリンダ又はバーを使用して、桁にモーメントを付加させることができる。
【００３９】
また、請求項６の本発明によれば、桁に掛かるモーメントを調整することができる。また、桁に掛かるモーメントを定常に維持することが出来る。桁に掛かる応力あるいは荷重付加手段の張力／圧縮力等を計測し、その計測値に基いて自動的に荷重調整手段を調整制御することも可能である。
【図面の簡単な説明】
【図１】本発明の第１の実施の態様に係る天井走行クレーンの桁断面摸式図。
【図２】本発明の第２の実施の形態に係る天井走行クレーンの桁断面摸式図。
【図３】本発明の第３の実施の形態に係る天井走行クレーンの桁断面摸式図。
【図４】図１及び図２に係るモーメント荷重図。
【図５】図３に係るモーメント荷重図。
【図６】従来の技術に係る天井走行クレーンを備えた建屋の断面図。
【符号の説明】
１…天井走行クレーン
２…桁
３…走行車輪
４…フック
５…横行レール
６…昇降装置
７…横行車輪
１１…ワイヤーロープ
１２…ターンバックル
１４…バー
１５…油圧シリンダ
２０ａ，２０ｂ…走行レール
５２ａ，５２ｂ…横梁
５０…建屋[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an overhead traveling crane installed in a building.
[0002]
[Prior art]
FIG. 6 is a sectional view of a building provided with an overhead traveling crane according to the related art.
[0003]
In FIG. 6, a pair of cross beams 53a, 53b supporting rails 20a, 20b for traveling by the overhead traveling crane 1 attached to the column 51 are provided at the upper part in the building 50. The overhead traveling crane 1 includes a girder 2 which is a main structure, traveling wheels 3 for traveling on rails 20a and 20b of a building at the lowermost ends of the girder 2, and a traversing rail supported by the girder 2. 5, a lifting device 6 having a hook 4 supported by the traversing rail 5 for raising and lowering a load, and a traversing wheel 7 for traversing the traversing rail provided on the lifting device 6.
[0004]
When the load in the building 50 is lifted by the lifting device 6, the weight of the load is applied to the lifting device 6, and the weight of the girder 2 of the overhead traveling crane 1 is the combined weight of the load and the weight of the lifting device 6. , The beam 2 bends, and a bending moment is generated in the beam 2 due to the weight. There is an allowable limit to the amount of deflection due to this bending moment, and designs are made such as increasing the height in order not to increase the weight of the spar 2 (for example, see Patent Document 1). In addition, the cross beam 53 and the column 51 of the building 50 receive the total weight of the load, the lifting device 6 and the girder 2.
[0005]
[Patent Document 1]
JP-A-8-92589 (FIG. 1 and paragraph 1 [0003])
[0006]
[Problems to be solved by the invention]
What mainly affects the amount of deflection of the girder 2 is the bending moment due to the weight added by the weight of the load and the weight of the lifting device 6. If the bending moment applied to the girder 2 can be reduced, the bending moment of the girder 2 can be reduced. The amount of bending can be reduced, and the structure of the spar 2 can be reduced. In addition, since the total weight of the weight of the load, the weight of the lifting device 6 and the weight of the girder 2 is applied to the building, if the structure of the girder 2 becomes smaller, the weight of the overhead traveling crane decreases, and The required strength of the building to be supported can be designed to be small, and the structure of the building can be reduced in weight. Reducing the weight of a building structure is far more economical than reducing the weight of an overhead traveling crane.
[0007]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a means for reducing a moment applied to a girder of an overhead traveling crane and to reduce the weight of the overhead traveling crane and the structure of a building.
[0008]
[Means for Solving the Problems]
In order to solve the above problem, the present invention according to claim 1, a plurality of cross beams installed in the upper part of the building, a pair of running rails supported by the cross beams, and straddling the running rail It has a girder having traveling wheels traveling on a traveling rail, a traversing rail supported by the girder, and lifting means having traversing wheels supported by the traversing rail and traversing in the longitudinal direction of the spar and elevating and lowering a load. The overhead traveling crane is characterized by comprising a pair of load supporting means provided at both ends of the girder, and a load applying means connecting the pair of load supporting means.
[0009]
According to the above configuration, it is possible to apply a bending moment to the girder by applying a load to the load supporting means by the load applying means connecting the pair of load supporting means provided at both ends of the girder of the overhead traveling crane. it can. The bending moment by the load supporting means and the load applying means is applied to the girder so as to act in the opposite direction to the bending moment acting on the girder when the load is hung by the elevating means. Accordingly, the bending moment acting on the overhead traveling crane due to the weight of the load is reduced, and the generated stress is reduced, so that the girder member can be made smaller. When the members of the girder of the overhead traveling crane are reduced, the weight of the overhead traveling crane is reduced, and accordingly, the load applied to the building is reduced, and the members of the building can be reduced.
[0010]
There are traversing wheels at the extreme end of the girder of the overhead traveling crane, which may interfere with structures such as beams of the building, and the load supporting means may be provided relatively at the center from the extreme end of the girder. However, it goes without saying that it is within the technical scope of the present invention.
[0011]
In order to solve the above problem, the present invention according to claim 2 is the invention according to claim 1, wherein the pair of load supporting means provided at the lower part of both ends of the spar is provided by the load applying means. The load applying means is connected so as to apply a load to the pair of load supporting means in a direction in which the distance between the pair of load supporting means is reduced, and to add a bending moment to the girder.
[0012]
According to the above configuration, when the lifting / lowering means traverses over the girder, the pair of load supporting means is provided below the bottom of the girder by protruding the pair of load supporting means further below the bottom surfaces of both ends of the girder, and the protruding portion of the load supporting means. Can be connected by a load applying means, and a load can be applied by the load applying means so that the load supporting means attracts each other, and a moment can be added to the girder. The longer the protrusion dimension protruding downward, the greater the moment applied to the girder, but the dimension is determined in consideration of interference with the suspended load.
[0013]
According to a third aspect of the present invention, in order to solve the above-mentioned problem, in the first aspect of the present invention, a pair of the load supporting means provided on upper ends of both ends of the girder is provided by the load applying means. The load applying means is connected so as to apply a load to the pair of load supporting means in a direction in which the distance between the pair of load supporting means is increased to add a bending moment to the beam.
[0014]
According to the above configuration, when the lifting / lowering means hangs down on the rail set under the girder and traverses, the pair of load supporting means protrudes further above the upper surface of both ends of the girder and is provided at the upper part of the girder. The protruding portions of the load supporting means are connected by the load applying means, and a load is applied by the load applying means so that the load supporting means repel each other, so that a moment can be added to the girder. If the device cannot be added below the girder even if the elevating means is above the girder, it is effective to provide a load supporting means and a load adding means above the girder.
[0015]
In order to solve the above problem, the present invention described in claim 4 is characterized in that, in the present invention described in claim 2, the load applying means has a wire rope or a bar.
[0016]
According to the above configuration, the load supporting means is connected by the load applying means, and a load is applied by the load applying means so that the load supporting means attracts each other. Can be done. Tension acts on the wire rope or bar.
[0017]
In order to solve the above problem, the present invention described in claim 5 is characterized in that, in the present invention described in claim 3, the load applying means has a hydraulic cylinder or a bar.
[0018]
According to the above configuration, the load supporting means is connected by the load applying means, and using a fluid pressure cylinder or bar optimal for applying a load by the load applying means so that the load supporting means repels each other, A moment can be added. A compressive force acts on the hydraulic cylinder or bar. Water, oil, air or the like can be used as a fluid in the fluid pressure cylinder.
[0019]
According to a sixth aspect of the present invention, in order to solve the above-described problem, in the first aspect of the present invention, the load for adjusting the load applied to the load supporting unit by the load applying unit is provided. It is characterized by comprising adjusting means.
[0020]
According to the above configuration, the moment applied to the girder can be adjusted. In particular, when a wire rope is used, the moment applied to the girder can be constantly maintained by re-adjusting the elongation due to aging of the wire rope and always maintaining the optimum tension. Further, by adjusting the fluid pressure of the fluid pressure cylinder, the moment applied to the girder can be freely adjusted. As the load adjusting means, a fluid pressure cylinder, a turnbuckle, a machine screw, or the like can be used. It is also possible to measure the stress applied to the girder or the tension / compression force of the load applying means and to automatically adjust and control the load adjusting means based on the measured value.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a girder of an overhead traveling crane according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a girder of an overhead traveling crane according to a second embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a girder of an overhead traveling crane according to a third embodiment of the present invention. FIG. 4 shows a moment load diagram according to FIGS. FIG. 5 shows a moment load diagram according to FIG. 1 to 6, the same components are denoted by the same reference numerals, and redundant description thereof will be omitted.
[0022]
(First embodiment of the present invention)
In FIG. 1, the girder 2 of the overhead traveling crane 1 has a structure in which a central portion is bent slightly upward in advance so that the load is suspended by a hook 4 and a load 8 is applied so as to be substantially horizontal. The girder 2 is often composed of two pairs, in which case a lifting device 6 and a hook 4 are arranged between the two girder 2, and devices other than the traveling wheels 3 are provided on the lower surface of the girder 2. Not been. Load supporting means 10 having a predetermined length is provided on the lower surface of both ends of the girder 2, and the load supporting means 10 are connected to each other by a wire rope 11 as load applying means. The wire rope 11 is provided with a turnbuckle 12 as a load adjusting means so that the length can be adjusted.
[0023]
FIG. 4 shows a bending moment 31 when the lifting means 6 of the overhead traveling crane 1 shown in FIG. The girder 2 is supported at the support point 30, and the magnitude and direction of the bending moment indicate the direction in which the load is applied to the girder 2 downward from the support point 30. The bending moment 31 is maximum downward at the center of the spar 2, and the maximum bending moment is indicated by 34 at the center of the spar 2.
[0024]
However, when the length of the wire rope 11 is adjusted by the turnbuckle 12 and a tensile force is applied to the wire rope 11, a tensile load 16 is applied to the load supporting means 10. Due to the tensile load 16, a bending moment 32 is applied to the girder 2 in a direction opposite to the bending moment 31 via the load supporting means 10, and a bending moment 33 obtained by adding the bending moment 31 and the bending moment 32 to the girder 2 is actually applied. Hang on as. As shown at 35, the maximum bending moment of the bending moment 33 is reduced by the bending moment 32 as compared with the maximum bending moment.
[0025]
The turn buckle 12 as the load adjusting means shown in FIG. 1 only needs to be able to apply a tensile load 16 to the wire rope 11, and instead of the turn buckle 12, another load adjusting means for pulling the wire rope 11 to the load supporting means 10 or the spar 2. It is needless to say that the provision of the wire rope 11 or the use of a bar-shaped bar instead of the wire rope 11 is within the technical scope of the present invention.
[0026]
(Second embodiment of the present invention)
In FIG. 2, the girder 2 of the overhead traveling crane 1 has a structure in which a central portion is bent slightly upward in advance so as to be substantially horizontal when a load 8 is applied by catching a load with the hook 4. The girder 2 is often composed of two pairs, in which case a lifting device 6 and a hook 4 are arranged between the two girder 2, and devices other than the traveling wheels 3 are provided on the lower surface of the girder 2. Not been. A load supporting means 10 having a predetermined length is provided on the upper surface of substantially both ends of the beam 2, and the load supporting means 10 is connected to each other by a bar 14 as a load applying means and a hydraulic cylinder 15 as a load adjusting means.
[0027]
FIG. 4 shows a bending moment 31 when the lifting / lowering means 6 of the overhead traveling crane 1 shown in FIG. 2 lifts a load and is located at the center of the girder 2 as in the first embodiment of the present invention. The girder 2 is supported at the support point 30, and the magnitude and direction of the bending moment indicate the direction in which the load is applied to the girder 2 downward from the support point 30. The bending moment 31 is maximum downward at the center of the spar 2, and the maximum bending moment is indicated by 34 at the center of the spar 2.
[0028]
However, when the length of the hydraulic cylinder 15 is adjusted and a compressive force is applied to the bar 14, a compressive load 17 is applied to the load supporting means 10. Due to the compressive load 17, a bending moment 32 is applied to the beam 2 in a direction opposite to the bending moment 31 via the load supporting means 10, and a bending moment 33 obtained by adding the bending moment 31 and the bending moment 32 to the beam 2 is applied. Hang on as. As shown at 35, the maximum bending moment of the bending moment 33 is reduced by the bending moment 32 as compared with the maximum bending moment.
[0029]
The hydraulic cylinder 15 serving as the load adjusting means shown in FIG. 1 only needs to be able to apply a compressive load 17 to the load supporting means 10, and may provide another load adjusting means for compressing the load supporting means 10 instead of the hydraulic cylinder 15, or It goes without saying that using only the bar 14 instead of the hydraulic cylinder 15 or using only the hydraulic cylinder 15 instead of the bar 14 is within the technical scope of the present invention.
[0030]
(Third embodiment of the present invention)
In FIG. 3, the girder 2 of the overhead traveling crane 1 has a structure in which a central portion is slightly bent in advance so as to be substantially horizontal when a load 8 is applied by catching a load with the hook 4. The spar 2 is often composed of two pairs, in which case the lifting device 6 and the hook 4 are arranged between the two spar 2. If there is an obstacle on the lower surface of both ends of the girder 2 due to the arrangement of the overhead traveling crane 1 and it is impossible to provide a relatively large load supporting means 10, a relatively small load supporting means 10 is provided. In addition to the first embodiment of the present invention, a load assisting means 13 is provided on the lower surface of substantially the central portion of the spar 2.
[0031]
FIG. 5 shows a bending moment 31 when the lifting / lowering means 6 of the overhead traveling crane 1 shown in FIG. The girder 2 is supported at the support point 30, and the magnitude and direction of the bending moment indicate the direction in which the load is applied to the girder 2 downward from the support point 30. The bending moment 31 is maximum downward at the center of the spar 2, and the maximum bending moment is indicated by 34 at the center of the spar 2.
[0032]
However, when the length of the wire rope 11 is adjusted by the turnbuckle 12 and a tensile force is applied to the wire rope 11, a tensile load 16 is applied to the load supporting means 10. The load adding auxiliary means 13 is lifted upward by the tensile load 16, and the bending load 32 applies a bending moment 32 to the spar 2 in the opposite direction to the bending moment 31 via the load adding auxiliary means 13, and A bending moment 33 obtained by adding the bending moment 31 and the bending moment 32 is applied to 2 as an actual load. As shown at 35, the maximum bending moment of the bending moment 33 is reduced by the bending moment 32 as compared with the maximum bending moment.
[0033]
The turn buckle 12 serving as the load adjusting means shown in FIG. 3 only needs to be able to apply a tensile load 16 to the wire rope 11. Instead of the turn buckle 12, another load adjusting means for pulling the wire rope 11 to the load supporting means 10 or the spar 2. It is needless to say that the provision of the wire rope 11 or the use of a bar-shaped bar instead of the wire rope 11 is within the technical scope of the present invention.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, the bending moment acting on the overhead traveling crane due to the weight of the load is reduced and the generated stress is reduced, so that the girder member can be made smaller. When the members of the girder of the overhead traveling crane are reduced, the weight of the overhead traveling crane is reduced, and accordingly, the load applied to the building is reduced, and the members of the building can be reduced.
[0035]
According to the second aspect of the present invention, the pair of load supporting means is provided below the bottom of the girder by protruding the pair of load supporting means further below the bottom surface of both ends of the girder, and the protruding portion of the load supporting means is provided by the load applying means. When connected, a load can be applied by the load applying means so that the load supporting means attract each other, and a moment can be added to the beam.
[0036]
According to the third aspect of the present invention, the pair of load supporting means is provided above the upper end of the girder by protruding the pair of load supporting means further above the upper surface of both ends of the girder, and the protruding portion of the load supporting means is provided by the load applying means. In this connection, a load can be applied by the load applying means so that the load supporting means repel each other, and a moment can be applied to the beam. If the device cannot be added below the girder even if the elevating means is above the girder, it is effective to provide a load supporting means and a load adding means above the girder.
[0037]
According to the present invention of claim 4, the load supporting means is connected by the load applying means, and a wire rope or a bar optimal for applying a load by the load applying means so that the load supporting means attracts each other is used. , A moment can be added to the girders.
[0038]
According to the fifth aspect of the present invention, the load supporting means is connected by the load applying means, and an optimal cylinder or bar is used for applying a load by the load applying means so that the load supporting means repel each other. Thus, a moment can be added to the girder.
[0039]
Further, according to the present invention, the moment applied to the spar can be adjusted. Further, the moment applied to the girder can be constantly maintained. It is also possible to measure the stress applied to the girder or the tension / compression force of the load applying means and to automatically adjust and control the load adjusting means based on the measured value.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a girder cross section of an overhead traveling crane according to a first embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a girder of an overhead traveling crane according to a second embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of a girder of an overhead traveling crane according to a third embodiment of the present invention.
FIG. 4 is a moment load diagram according to FIGS. 1 and 2;
FIG. 5 is a moment load diagram according to FIG. 3;
FIG. 6 is a cross-sectional view of a building provided with an overhead traveling crane according to the related art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Overhead traveling crane 2 ... Girder 3 ... Traveling wheel 4 ... Hook 5 ... Traversing rail 6 ... Elevating device 7 ... Traversing wheel 11 ... Wire rope 12 ... Turnbuckle 14 ... Bar 15 ... Hydraulic cylinder 20a, 20b ... Traveling rail 52a, 52b ... horizontal beam 50 ... building

Claims

A plurality of cross beams installed at the top of the building, a pair of running rails supported by the cross beams, a girder having running wheels that run on the running rails over the running rails, and are supported by the girder. A lifting rail having a traversing rail and traversing wheels supported by the traversing rail and traversing in the longitudinal direction of the spar and elevating and lowering the load, a pair of load supports provided at both ends of the spar. An overhead traveling crane, comprising: a load applying means connected to the pair of load supporting means.

The pair of load supporting means provided below the both ends of the beam are connected by the load applying means, and the load applying means applies a load to the pair of load supporting means in a direction in which the distance between the pair of load supporting means is reduced. 2. The overhead traveling crane according to claim 1, wherein a bending moment is applied to the girder.

The pair of load supporting means provided above both ends of the beam are connected by the load applying means, and the load applying means applies a load to the pair of load supporting means in a direction in which the distance between the pair of load supporting means is increased. 2. The overhead traveling crane according to claim 1, wherein a bending moment is applied to the girder.

The overhead traveling crane according to claim 2, wherein the load applying means includes a wire rope or a bar.

The overhead traveling crane according to claim 3, wherein the load applying means includes a hydraulic cylinder or a bar.

The overhead traveling crane according to any one of claims 1 to 5, wherein the load applying means includes a load adjusting means for adjusting a load applied to the load supporting means.