JP3831973B2

JP3831973B2 - Tower link

Info

Publication number: JP3831973B2
Application number: JP9911096A
Authority: JP
Inventors: 郁夫下田; 充宮崎
Original assignee: Oiles Corp
Current assignee: Oiles Corp
Priority date: 1996-03-28
Filing date: 1996-03-28
Publication date: 2006-10-11
Anticipated expiration: 2016-03-28
Also published as: JPH09268517A

Description

【０００１】
【発明の属する技術分野】
本発明は、吊り橋の橋桁の揺動を減衰させるために、吊り橋のタワー（主塔）と橋桁との間に配設されるタワーリンクに関する。
【０００２】
【発明が解決しようとする課題】
吊り橋は、通常、タワー間に張られたメインケーブルから垂直に吊り下げられた多数のハンガーケーブルと、タワーに取り付けられたタワーリンクとによって橋桁を支えるようになっている。
【０００３】
ところで、この種の吊り橋のタワーリンクにおいては、台風や地震によって橋桁が大きく揺れないように、減衰機能を兼ね備えていることが好ましいが、この減衰機能を持たせるための減衰機構としてシリンダを用いた直動油圧式のダンパーを用いると、ダンパー自体では橋桁を支えることが困難であり、したがって、必然的にリンク機構に並置されたものとなる。更に、直動油圧式のダンパーでは、シールの劣化等による油液の漏出が生じ、定期的な保守、点検を要し、これを怠ると耐用年数が著しく短くなる虞がある。
【０００４】
本発明は、前記諸点に鑑みてなされたものであって、その目的とするところは、支持機能と減衰機能とを兼ね備えて、しかも、定期的な保守、点検をそれほど必要とすることなし、長期に亘って初期の特性を維持し得るタワーリンクを提供することにある。
【０００５】
【課題を解決するための手段】
本発明によれば前記目的は、リンク本体と、このリンク本体の一端を吊り橋の橋桁に回動自在に連結するために、リンク本体の一端に形成された橋桁側の軸受部と、吊り橋のタワーに回動自在に連結するために、リンク本体の他端に形成されたタワー側の軸受部とを有した吊り橋用のタワーリンクであって、両軸受部のうち少なくとも一方は、鉛と、この鉛に対する鉛剪断塑性変形機構とを具備しているタワーリンクによって達成される。
【０００６】
本発明においては、橋桁側の軸受部に、鉛と、この鉛に対する鉛剪断塑性変形機構と、軸と、リンク本体を橋桁に取り付けるための取り付け部材とを備えて構成し、鉛を、軸と取り付け部材との間に介在させてもよく、これに代えて又はこれと共に、タワー側の軸受部に、鉛と、この鉛に対する鉛剪断塑性変形機構と、軸と、リンク本体をタワーに取り付けるための取り付け部材とを備えて構成し、タワー側の鉛を、タワー側の軸受部の軸と取り付け部材との間に介在させてもよい。
【０００７】
鉛剪断塑性変形機構は、リンク本体の回動軸心に直交する環状平面に沿って鉛を剪断塑性変形させるように、又はリンク本体の回動軸心と同心の円筒面に沿って鉛を剪断塑性変形させるように、それぞれ構成されていてもよい。前者の場合、鉛剪断塑性変形機構は、鉛収容用の環状空間を形成した鉛収容体を具備しており、鉛収容体は、リンク本体の回動軸心に直交した互いに対面する環状壁面を有して、互いに相対回転自在な対面する一対の環状壁部を具備しており、一対の環状壁部間に鉛が配されており、一対の環状壁部の互いに対面する環状壁面のそれぞれには、鉛を保持する保持手段が設けられているものを一例として、また、後者の場合、鉛剪断塑性変形機構は、鉛収容用の環状空間を形成した鉛収容体を具備しており、鉛収容体は、リンク本体の回動軸心と同心の互いに対面する円筒状壁面を有して、互いに相対回転自在な対面する一対の円筒状壁部を具備しており、一対の円筒状壁部間に鉛が配されており、一対の円筒状壁部の互いに対面する円筒状壁面のそれぞれには、鉛を保持する保持手段が設けられているものを一例としてそれぞれ示し得る。
【０００８】
鉛を保持する保持手段は、突起又は凹所であってもよいが、その他の適宜のものであってもよい。
【０００９】
リンク本体は、通常、一対の対面して配された板状体から形成されるが、これに代えて、円筒状又は角筒状に形成してもよく、要は支える荷重との関連で適宜のものを使用することができる。
【００１０】
【発明の実施の形態】
次に本発明の実施の形態を、図に示す好ましい実施例に基づいて更に詳細に説明する。なお、本発明はこれら実施例に何等限定されないのである。
【００１１】
【実施例】
図１から図３において、本例の吊り橋１００用のタワーリンク１は、リンク本体２と、リンク本体２の一端３を吊り橋１００の橋桁４に回動自在に連結するために、リンク本体２の一端３に形成された橋桁４側の軸受部５と、吊り橋１００のタワー６に回動自在に連結するために、リンク本体２の他端７に形成されたタワー６側の軸受部８と具備しており、軸受部５は、鉛６１と、鉛６１に対する鉛剪断塑性変形機構９とを具備している。
【００１２】
リンク本体２は、互いに対面して平行に配された一対の鋼板２１及び２２と、鋼板２１及び２２のそれぞれに溶着された補強鋼板２３及び２４とからなる。
【００１３】
橋桁４側の軸受部５は、リンク本体２の一対の鋼板２１及び２２の一端２５及び２６を貫通して配されて、当該一端２５及び２６が溶接等により固着された軸２７と、リンク本体２を橋桁４に取り付けるため取り付け部材３２及び３２ａとを具備しており、軸２７の一方の端部２８と一方の取り付け部材３２との間に介在される鉛剪断塑性変形機構９は、軸２７の端部２８を囲繞して当該端部２８の外周面２９との間に鉛収容用の環状空間３０を形成し、軸２７に対して摺動回転自在に配された軸囲繞体３１と、一端２５と軸２７との連結を補強すると共に、軸囲繞体３１と協同して環状空間３０を形成する補強部材３６とからなる鉛収容体３７を具備しており、軸囲繞体３１は、一方では、取り付け部材３２にボルト等により固定されており、他方では、補強部材３６の一方の面に固着された環状係合部材４０に係合されて、当該環状係合部材４０を介して補強部材３６に回転摺動自在に支持されており、補強部材３６は、一端では、溶接等により軸２７の端部２８に固着され、他端では、ボルト３８、カラー３９により一端２５に固着されて設けられている。
【００１４】
本例では、軸２７の他方の端部３３側にも、鉛（図示しない）と、この鉛に対する鉛剪断塑性変形機構９ａとが設けられており、鉛剪断塑性変形機構９と同様に構成された鉛剪断塑性変形機構９ａは、軸２７の端部３３を囲繞して軸２７の当該端部３３の外周面との間に鉛収容用の環状空間（図示せず）を形成し、軸２７に対して摺動回転自在に配された軸囲繞体３１ａと、一端２６と軸２７の端部３３との連結を補強すると共に、軸囲繞体３１ａと協同して前記環状空間を形成する補強部材３６ａとからなる鉛収容体３７ａを具備しており、軸囲繞体３１ａは、一方では、取り付け部材３２ａに固着されており、他方では、補強部材３６ａの一方の面に固着された環状係合部材４０ａに係合されて、当該環状係合部材４０ａを介して補強部材３６ａに回転摺動自在に支持されており、補強部材３６ａは、一端では、溶接等により軸２７の端部３３に固着され、他端では、ボルト３８ａ、カラー３９ａにより一端２６に固着されて設けられている。軸２７及び補強部材３６、３６ａは、軸囲繞体３１及び３１ａに対して相対回転自在となっており、これらを介してリンク本体２の一端３は、取り付け部材３２及び３２ａに回動自在に連結されて支持されるようになっている。
【００１５】
なお、本例のように軸２７の両端部２８及び３３に、鉛と、鉛に対する鉛剪断塑性変形機構９及び９ａを設けてもよいが、両端部２８及び３３のうちいずれか一方のみにこれらを設けて構成してもよい。
【００１６】
鉛収容体３７である軸囲繞体３１は、リンク本体２の回動軸心Ａに直交した環状壁面４１を有した環状壁部４２を具備しており、鉛収容体３７である補強部材３６は、環状壁面４１に対面すると共に、同じくリンク本体２の回動軸心Ａに直交した環状壁面４３を有し、環状壁部４２に対面して、環状壁部４２に対して相対回転自在な環状壁部４４を具備しており、一対の環状壁部４２及び４４間に鉛６１が充填されて配されている。一対の環状壁部４２及び４４の互いに対面する環状壁面４１及び４３のそれぞれには、鉛６１を保持する保持手段４５及び４６として複数個の突起４７及び４８が回転方向Ｒに沿って等間隔に配列して設けられている。突起４７及び４８のそれぞれは、環状空間３０に収容された鉛６１に食い込んで、軸囲繞体３１に対する補強部材３６のＲ方向の相対回転において鉛６１に対して環状壁部４２及び４４が滑らないようにしている。軸２７の他方の端部３３側の鉛剪断塑性変形機構９ａも同様に形成されている。
【００１７】
タワー３側の軸受部８は、リンク本体２の一対の鋼板２１及び２２の他端５１及び５２を貫通して配された軸５３と、軸５３に摺動回転自在に被着されたブッシュ５４と、軸５３の両端に溶接等により固着されたフランジ部材５５及び５６とを有しており、他端５１及び５２を貫通したブッシュ５４に、当該他端５１及び５２が溶接等により固着されて、リンク本体２の他端７は、軸５３に回動自在に連結されている。
【００１８】
以上のタワーリンク１は、図３に示すように、取り付け部材３２及び３２ａが橋桁４にボルト等により固定され、軸５３が連結部材７１及び７２を介してタワー６に回動自在に連結されて、タワー３間に張られたメインケーブル８１、メインケーブル８１から垂直に吊り下げられた多数のハンガーケーブル８２、多数のハンガーケーブル８２に支えられた橋桁４、タワー６を支持する橋脚８３からなる吊り橋１００において、橋桁４をハンガーケーブル８２と共に支持し、更に、橋桁４の水平揺動を減衰させるために用いられる。
【００１９】
橋桁４の水平揺動において、軸囲繞体３１と軸２７との間にＲ方向の相対回転が生じると、環状空間３０に配された鉛６１を、回動軸心Ａに直交する環状平面に沿って剪断塑性変形させるような剪断力が保持手段４５及び４６を介して当該鉛６１に生じ、これにより鉛６１が剪断塑性変形される。鉛６１の剪断塑性変形により橋桁４の水平揺動エネルギは吸収されて、而して、橋桁４の水平揺動は早急に減衰されることになる。軸２７の他方の端部３３側においても同様に、鉛と鉛剪断塑性変形機構９ａとにより橋桁４の水平揺動エネルギは吸収される。
【００２０】
このようにタワーリンク１では、支持機能と減衰機能とを兼ね備え、しかも、鉛６１を用いるため、劣化、漏出の虞が殆どなく、定期保守、点検を大幅に減少させることができる。
【００２１】
なお、タワー６側の軸受部８にも鉛剪断塑性変形機構９と同様の鉛剪断塑性変形機構を設けてもよいのは勿論であり、更に、鋼板２１及び２２の一方側にのみ鉛剪断塑性変形機構を設けるようにしてもよい。
【００２２】
ところで以上の例は、環状空間３０に配された鉛６１を、回動軸心Ａに直交する環状平面に沿って剪断塑性変形させて、鉛６１のこの剪断塑性変形により橋桁４の水平揺動エネルギを吸収するようにしたが、これに代えて又はこれと共に、図４及び５に示すように、リンク本体２の回動軸心Ａと同心の円筒面に沿って鉛６１を剪断塑性変形させるように、鉛剪断塑性変形機構を構成してもよい。
【００２３】
図４及び５に示す鉛剪断塑性変形機構１１１は、鉛収容用の環状空間１１２を形成した鉛収容体１１３を具備しており、鉛収容体１１３は、軸２７の端部２８を囲繞して、取り付け部材３２にボルト等により固定された軸囲繞体１１４と、キー１１５により軸２７の端部２８に固定されて、当該端部２８に嵌着された円筒体１１６とを具備しており、軸囲繞体１１４は、リンク本体２の回動軸心Ａと同心の円筒状壁面１２１を有した円筒状壁部１２２を具備しており、円筒体１１６は、リンク本体２の回動軸心Ａと同心であって、円筒状壁面１２１に対面する円筒状壁面１３１を有して、円筒状壁部１２２に対して相対回転自在であって、円筒状壁部１２２に対面する円筒状壁部１３２を具備しており、一対の円筒状壁部１２２及び１３２間の環状空間１１２に鉛６１が充填されて配されており、一対の円筒状壁部１２２及び１３２の互いに対面する円筒状壁面１２１及び１３１のそれぞれには、鉛６１を保持する保持手段１５１及び１５２として複数個の突起１５３及び１５４がＲ方向に等間隔に配列されて設けられている。なお、本例では、軸２７の端部２８には、環状段部１６１が形成されており、環状段部１６１と取り付け部材３２との間には、環状のスラスト軸受１６２が介装されており、取り付け部材３２及びスラスト軸受１６２の内周縁と軸２７の端部２８の外周面２９との間には、軸受ブッシュ１６３が挿着されている。
【００２４】
鉛剪断塑性変形機構１１１では、橋桁４の水平揺動において、軸囲繞体１１４と軸２７との間にＲ方向の相対回転が生じると、環状空間１１２に配された鉛６１を、回動軸心Ａに同心の環状平面に沿って剪断塑性変形させるような剪断力が保持手段１５１及び１５２を介して当該鉛６１に生じ、これにより鉛６１が剪断塑性変形される。鉛６１の剪断塑性変形により橋桁４の水平揺動エネルギは吸収されて、而して、橋桁４の水平揺動は早急に減衰されることになる。したがって、鉛剪断塑性変形機構１１１でも鉛剪断塑性変形機構９と同様な効果を得ることができる。
【００２５】
【発明の効果】
以上のように本発明によれば、支持機能と減衰機能とを兼ね備えて、しかも、定期的な保守、点検をそれほど必要とすることなし、長期に亘って初期の特性を維持し得る。
【図面の簡単な説明】
【図１】本発明の好ましい一実施例の側面説明図である。
【図２】図１に示す例の正面説明図である。
【図３】図１に示す例を吊り橋に用いた説明図である。
【図４】本発明の好ましい他の実施例の一部説明図である。
【図５】図４に示す例のＶ−Ｖ線断面説明である。
【符号の説明】
１タワーリンク
２リンク本体
４橋桁
５、８軸受部
６タワー
９鉛剪断塑性変形機構[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tower link disposed between a tower (main tower) of a suspension bridge and a bridge girder in order to attenuate the swing of the bridge girder of the suspension bridge.
[0002]
[Problems to be solved by the invention]
The suspension bridge usually supports the bridge girder by a number of hanger cables suspended vertically from a main cable stretched between the towers and a tower link attached to the tower.
[0003]
By the way, in the tower link of this kind of suspension bridge, it is preferable to have a damping function so that the bridge girder is not greatly shaken by a typhoon or an earthquake, but a cylinder was used as a damping mechanism for providing this damping function. When a direct acting hydraulic damper is used, it is difficult to support the bridge girder by the damper itself, and therefore, the damper is necessarily juxtaposed to the link mechanism. Further, in a direct acting hydraulic damper, oil leakage occurs due to deterioration of the seal, etc., and periodic maintenance and inspection are required. If this is neglected, the service life may be significantly shortened.
[0004]
The present invention has been made in view of the above-mentioned points, and its object is to have both a support function and a damping function, and without requiring much regular maintenance and inspection, and for a long time. It is an object of the present invention to provide a tower link capable of maintaining the initial characteristics over the entire period.
[0005]
[Means for Solving the Problems]
According to the present invention, the object of the present invention is to provide a link body, a bearing portion on the bridge girder side formed at one end of the link body, and a suspension bridge tower in order to rotatably connect one end of the link body to the bridge girder of the suspension bridge. A tower link for a suspension bridge having a tower-side bearing portion formed at the other end of the link body, at least one of the bearing portions being composed of lead, This is achieved by a tower link equipped with a lead shear plastic deformation mechanism for lead.
[0006]
In the present invention, the bearing part on the bridge girder side includes lead, a lead shear plastic deformation mechanism for the lead, a shaft, and an attachment member for attaching the link body to the bridge girder. In order to attach lead, a lead shear plastic deformation mechanism for the lead, a shaft, and a link body to the tower, instead of or together with this, may be interposed between the mounting member and the bearing member on the tower side. The tower-side lead may be interposed between the shaft of the bearing portion on the tower side and the mounting member.
[0007]
The lead shear plastic deformation mechanism shears lead so as to shear plastically deform lead along an annular plane perpendicular to the rotation axis of the link body, or along a cylindrical surface concentric with the rotation axis of the link body. Each may be configured to be plastically deformed. In the former case, the lead shear plastic deformation mechanism includes a lead container that forms an annular space for accommodating lead, and the lead container has annular wall surfaces that face each other perpendicular to the rotation axis of the link body. Each of the annular wall surfaces of the pair of annular wall portions facing each other. In the latter case, the lead shear plastic deformation mechanism is provided with a lead container in which an annular space for lead accommodation is formed. The container has a pair of cylindrical wall portions facing each other and having concentric cylindrical wall surfaces that are concentric with the rotation axis of the link body, and are relatively rotatable with respect to each other. Cylindrical walls with lead in between and facing each other of a pair of cylindrical walls Each of may respectively what is holding means for holding the lead are provided as an example.
[0008]
The holding means for holding lead may be a protrusion or a recess, but may be any other appropriate means.
[0009]
The link body is usually formed from a pair of facing plate-like bodies. Alternatively, the link body may be formed in a cylindrical shape or a rectangular tube shape. Can be used.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.
[0011]
【Example】
1 to 3, the tower link 1 for the suspension bridge 100 according to the present example includes a link main body 2 and one end 3 of the link main body 2 connected to the bridge girder 4 of the suspension bridge 100 in a rotatable manner. A bearing portion 5 on the bridge girder 4 side formed at the one end 3 and a bearing portion 8 on the tower 6 side formed on the other end 7 of the link body 2 in order to be rotatably connected to the tower 6 of the suspension bridge 100. The bearing 5 includes a lead 61 and a lead shear plastic deformation mechanism 9 for the lead 61.
[0012]
The link main body 2 includes a pair of steel plates 21 and 22 that face each other and are arranged in parallel, and reinforcing steel plates 23 and 24 that are welded to the steel plates 21 and 22, respectively.
[0013]
The bearing portion 5 on the bridge girder 4 side is disposed through one end 25 and 26 of the pair of steel plates 21 and 22 of the link body 2, and the shaft 27 to which the one end 25 and 26 is fixed by welding or the like, and the link body 2 is provided with attachment members 32 and 32a for attaching the bridge 2 to the bridge girder 4, and the lead shear plastic deformation mechanism 9 interposed between one end portion 28 of the shaft 27 and one attachment member 32 is provided with the shaft 27. A shaft surrounding body 31 that surrounds the end portion 28 and forms an annular space 30 for accommodating lead between the end portion 28 and the outer peripheral surface 29 of the end portion 28, and is slidably rotatable with respect to the shaft 27; In addition to reinforcing the connection between the one end 25 and the shaft 27, the lead housing body 37 including a reinforcing member 36 that forms an annular space 30 in cooperation with the shaft surrounding body 31 is provided. Then, it is fixed to the mounting member 32 with a bolt or the like. On the other hand, it is engaged with an annular engaging member 40 fixed to one surface of the reinforcing member 36, and is supported by the reinforcing member 36 through the annular engaging member 40 so as to be freely slidable. The member 36 is fixed to one end 25 of the shaft 27 by welding or the like at one end, and fixed to the one end 25 by a bolt 38 and a collar 39 at the other end.
[0014]
In this example, lead (not shown) and a lead shear plastic deformation mechanism 9a for the lead are also provided on the other end 33 side of the shaft 27. The lead shear plastic deformation mechanism 9 is configured similarly to the lead shear plastic deformation mechanism 9. The lead shear plastic deformation mechanism 9a surrounds the end portion 33 of the shaft 27 and forms an annular space (not shown) for accommodating lead between the end portion 33 of the shaft 27 and the shaft 27. Reinforcing member that reinforces the connection between the shaft surrounding body 31a that is slidably rotatable with respect to the shaft, the one end 26 and the end portion 33 of the shaft 27, and that forms the annular space in cooperation with the shaft surrounding body 31a. 36a, and the shaft enclosure 31a is fixed to the attachment member 32a on the one hand, and the annular engagement member fixed to one surface of the reinforcing member 36a on the other hand. 40a is engaged with the reinforcing portion via the annular engagement member 40a. The reinforcing member 36a is fixed to the end 33 of the shaft 27 by welding or the like at one end, and is fixed to the one end 26 by a bolt 38a and a collar 39a at the other end. It has been. The shaft 27 and the reinforcing members 36 and 36a are rotatable relative to the shaft surrounding bodies 31 and 31a, and the one end 3 of the link body 2 is rotatably connected to the mounting members 32 and 32a via these. Has been supported.
[0015]
In addition, as in this example, both ends 28 and 33 of the shaft 27 may be provided with lead and lead shear plastic deformation mechanisms 9 and 9a for lead. May be provided.
[0016]
The shaft enclosure 31 that is the lead container 37 includes an annular wall portion 42 that has an annular wall surface 41 that is orthogonal to the rotational axis A of the link body 2, and the reinforcing member 36 that is the lead container 37 includes The annular wall 41 faces the annular wall 41 and also has an annular wall 43 orthogonal to the rotational axis A of the link body 2. The annular wall 43 faces the annular wall 42 and is rotatable relative to the annular wall 42. A wall portion 44 is provided, and lead 61 is filled between the pair of annular wall portions 42 and 44. A plurality of projections 47 and 48 as holding means 45 and 46 for holding the lead 61 are arranged at equal intervals along the rotation direction R on the annular wall surfaces 41 and 43 of the pair of annular wall portions 42 and 44 facing each other. They are arranged. Each of the protrusions 47 and 48 bites into the lead 61 accommodated in the annular space 30, and the annular wall portions 42 and 44 do not slide relative to the lead 61 in the relative rotation in the R direction of the reinforcing member 36 with respect to the shaft surrounding body 31. I am doing so. The lead shear plastic deformation mechanism 9a on the other end 33 side of the shaft 27 is also formed in the same manner.
[0017]
The bearing portion 8 on the tower 3 side includes a shaft 53 disposed through the other ends 51 and 52 of the pair of steel plates 21 and 22 of the link main body 2, and a bush 54 that is slidably and rotatably attached to the shaft 53. And flange members 55 and 56 fixed to both ends of the shaft 53 by welding or the like, and the other ends 51 and 52 are fixed to the bush 54 penetrating the other ends 51 and 52 by welding or the like. The other end 7 of the link body 2 is rotatably connected to the shaft 53.
[0018]
As shown in FIG. 3, the tower link 1 has the mounting members 32 and 32a fixed to the bridge girder 4 with bolts or the like, and the shaft 53 is rotatably connected to the tower 6 via the connecting members 71 and 72. A suspension bridge comprising a main cable 81 stretched between the towers 3, a number of hanger cables 82 suspended vertically from the main cable 81, a bridge girder 4 supported by the number of hanger cables 82, and a pier 83 that supports the tower 6. At 100, the bridge girder 4 is supported together with the hanger cable 82, and further used to damp horizontal swing of the bridge girder 4.
[0019]
When relative rotation in the R direction occurs between the shaft enclosure 31 and the shaft 27 in the horizontal swing of the bridge girder 4, the lead 61 disposed in the annular space 30 becomes an annular plane orthogonal to the rotational axis A. A shearing force that causes shear plastic deformation along the lead 61 is generated in the lead 61 through the holding means 45 and 46, whereby the lead 61 is shear plastically deformed. The horizontal swing energy of the bridge girder 4 is absorbed by the shear plastic deformation of the lead 61, and thus the horizontal swing of the bridge girder 4 is quickly attenuated. Similarly, on the other end 33 side of the shaft 27, the horizontal swing energy of the bridge girder 4 is absorbed by the lead and the lead shear plastic deformation mechanism 9a.
[0020]
As described above, the tower link 1 has both a support function and a damping function, and further uses lead 61, so there is almost no risk of deterioration and leakage, and regular maintenance and inspection can be greatly reduced.
[0021]
Of course, the bearing 8 on the tower 6 side may be provided with a lead shear plastic deformation mechanism similar to the lead shear plastic deformation mechanism 9, and the lead shear plasticity only on one side of the steel plates 21 and 22. A deformation mechanism may be provided.
[0022]
By the way, in the above example, the lead 61 arranged in the annular space 30 is subjected to shear plastic deformation along the annular plane orthogonal to the rotation axis A, and the horizontal swing of the bridge girder 4 is caused by this shear plastic deformation of the lead 61. Instead of or together with this, as shown in FIGS. 4 and 5, the lead 61 is subjected to shear plastic deformation along the cylindrical surface concentric with the rotational axis A of the link body 2. Thus, you may comprise a lead shear plastic deformation mechanism.
[0023]
The lead shear plastic deformation mechanism 111 shown in FIGS. 4 and 5 includes a lead containing body 113 having an annular space 112 for containing lead, and the lead containing body 113 surrounds the end portion 28 of the shaft 27. A shaft surrounding body 114 fixed to the attachment member 32 with a bolt or the like, and a cylindrical body 116 fixed to the end portion 28 of the shaft 27 by the key 115 and fitted to the end portion 28. The shaft surrounding body 114 includes a cylindrical wall portion 122 having a cylindrical wall surface 121 concentric with the rotational axis A of the link body 2, and the cylindrical body 116 is configured to rotate around the rotational axis A of the link body 2. A cylindrical wall portion 131 that is concentric with the cylindrical wall surface 121 and that is rotatable relative to the cylindrical wall portion 122 and that faces the cylindrical wall portion 122. Between the pair of cylindrical walls 122 and 132 The annular space 112 is filled with lead 61 and the cylindrical wall surfaces 121 and 131 of the pair of cylindrical wall portions 122 and 132 facing each other are respectively provided as holding means 151 and 152 for holding the lead 61. A plurality of protrusions 153 and 154 are arranged at equal intervals in the R direction. In this example, an annular step 161 is formed at the end 28 of the shaft 27, and an annular thrust bearing 162 is interposed between the annular step 161 and the mounting member 32. A bearing bush 163 is inserted between the inner peripheral edge of the mounting member 32 and the thrust bearing 162 and the outer peripheral surface 29 of the end portion 28 of the shaft 27.
[0024]
In the lead shear plastic deformation mechanism 111, when relative rotation in the R direction occurs between the shaft enclosure 114 and the shaft 27 in the horizontal swing of the bridge girder 4, the lead 61 arranged in the annular space 112 is turned into the rotation shaft. A shearing force is generated in the lead 61 via the holding means 151 and 152 so as to cause shear plastic deformation along an annular plane concentric with the core A, whereby the lead 61 is shear plastic deformed. The horizontal swing energy of the bridge girder 4 is absorbed by the shear plastic deformation of the lead 61, and thus the horizontal swing of the bridge girder 4 is quickly attenuated. Therefore, the lead shear plastic deformation mechanism 111 can obtain the same effect as the lead shear plastic deformation mechanism 9.
[0025]
【The invention's effect】
As described above, according to the present invention, both the support function and the damping function are provided, and the initial characteristics can be maintained for a long period without requiring regular maintenance and inspection.
[Brief description of the drawings]
FIG. 1 is a side view of a preferred embodiment of the present invention.
2 is an explanatory front view of the example shown in FIG. 1. FIG.
FIG. 3 is an explanatory diagram in which the example shown in FIG. 1 is used for a suspension bridge.
FIG. 4 is a partial explanatory view of another preferred embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along line VV of the example shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tower link 2 Link main body 4 Bridge girder 5, 8 Bearing part 6 Tower 9 Lead shear plastic deformation mechanism

Claims

A link main body made of a steel plate, and a bearing portion on the bridge girder side formed at one end of the link main body and the other end of the steel plate of the link main body in order to rotatably connect one end of the steel plate of the link main body to the bridge girder of the suspension bridge Is a tower link for a suspension bridge having a tower-side bearing portion formed at the other end of the link body, and the bridge girder-side bearing portion is connected to the tower of the suspension bridge. A shaft arranged at one end of the steel plate and an attachment member for attaching one end of the steel plate of the link body to the bridge girder, and the bearing portion on the tower side is arranged at the other end of the steel plate of the link main body A shaft, and an attachment member for attaching the other end of the steel plate of the link body to the tower, and at least one of the bearing portions includes the shaft and the attachment member of the at least one bearing portion. Is intervened between Lead and tower link that includes a lead-shear plastic deformation mechanism for this lead.

The bridge part on the bridge girder side is provided with lead and a lead shear plastic deformation mechanism for this lead, and the lead of the bearing part on the bridge girder side is interposed between the shaft of the bearing part on the bridge girder side and the mounting member. The tower link according to claim 1.

The tower link according to claim 1 or 2, wherein the lead shear plastic deformation mechanism is configured to shear plastically deform lead along an annular plane perpendicular to the rotation axis of the link body.

The lead shear plastic deformation mechanism includes a lead container in which an annular space for lead accommodation is formed, and the lead container has annular wall surfaces facing each other perpendicular to the rotation axis of the link body, A pair of facing annular walls that are rotatable relative to each other are provided, and lead is arranged between the pair of annular walls, and each of the annular wall surfaces facing each other of the pair of annular walls is made of lead. The tower link according to claim 3, wherein holding means for holding is provided.

The tower link according to claim 1 or 2, wherein the lead shear plastic deformation mechanism is configured to shear plastically deform lead along a cylindrical surface concentric with the rotational axis of the link body.

The lead shear plastic deformation mechanism includes a lead container that forms an annular space for lead accommodation, and the lead container has cylindrical wall surfaces that are concentric with the rotation axis of the link body and face each other. Each of the cylindrical wall surfaces of the pair of cylindrical wall portions facing each other, each having a pair of cylindrical wall portions facing each other and capable of rotating relative to each other, wherein lead is arranged between the pair of cylindrical wall portions. The tower link according to claim 5, wherein holding means for holding lead is provided.

The tower link according to claim 4 or 6, wherein the holding means for holding lead is a protrusion or a recess.

The tower-side bearing section is provided with lead and a lead shear plastic deformation mechanism for the lead, and the tower-side bearing section lead is interposed between the tower-side bearing section shaft and the mounting member. The tower link according to claim 1.