JP3604077B2

JP3604077B2 - Damping device and pedestrian bridge equipped with the device

Info

Publication number: JP3604077B2
Application number: JP2000200402A
Authority: JP
Inventors: 正洋南條; 正和常次; 章秀畑中
Original assignee: 株式会社ニチゾウテック
Priority date: 2000-07-03
Filing date: 2000-07-03
Publication date: 2004-12-22
Anticipated expiration: 2020-07-03
Also published as: JP2002021916A

Description

【０００１】
【発明の属する技術分野】
本発明は、歩道橋に簡単に適用できる制振装置（同調質量ダンパー）及びその制振装置を取り付けた歩道橋に関する。
【０００２】
【従来の技術】
一般に比較的長い歩道橋においては、橋桁の固有振動数が歩行者の歩調に近づくことになり、歩行による振動が大きくなる。
【０００３】
ところで、規模が大きい歩道橋では、断面が箱桁で構成されているため、箱桁の空間部が大きく、その空間部に制振装置が設置されている。
【０００４】
【発明が解決しようとする課題】
規模が小さい歩道橋では、桁構造が開断面のＩ桁であり、桁高さが低いため、歩道橋の床板とＩ桁で構成される床下空間に制振装置を組み込むことができないという問題点がある。
【０００５】
一方、前記の規模が大きい歩道橋では、当初から制振装置を設置することがあるが、設計その他の理由により制振結果が不都合の場合、桁の断面を変更して曲げ剛性を増大することは、大変なことであり、大幅なコスト高になるという問題点がある。
【０００６】
本発明は、前記の点に留意し、小規模の歩道橋にも容易に設置できるほか、既設の歩道橋に対しても簡単に取り付けでき、歩行者の歩行に影響を与えなく、歩道橋に簡単に設置できる制振装置を提供し、かつ、その制振装置を取り付けた歩道橋を提供することを目的とする。
【０００７】
【課題を解決するための手段】
前記目的を達成するために、本発明の制振装置は、
歩道橋の高欄に取り付ける制振装置であって、
断面が矩形状の上側パイプ、下側パイプ、両側パイプの４本を接合して形成された枠体と、該枠体の裏面に固着された裏板と、前記枠体の前面に着脱自在に取り付けられた蓋板とにより構成され、幅より高さが小さく、さらに奥行が小さい前後方向が扁平な直方体形状の箱体と、
該箱体内の両側に上下方向に固定され、上・下端部が前記上側パイプ・前記下側パイプの内面に固着された支持具により支持されたガイドを構成する固定支柱と、
幅より高さが小さく、さらに奥行が小さい前後方向が扁平な横長直方体形状のブロック状重錘と、
該重錘の両側部に形成された上下方向の透孔と、
該透孔の上端部・下端部に取り付けられ、前記固定支柱が挿入され、前記重錘を前記固定支柱をガイドとして上下動自在にしたリニアブッシュと、
前記重錘にボルトにより取り付けられた複数枚の調整錘と、
前記両固定支柱の内方に位置し、前記重錘の下面と前記下側パイプの上面、または前記重錘の上面と前記上側パイプの下面、あるいは前記重錘の下面及び上面と、前記下側パイプの上面及び前記上側パイプの下面の両方との間に設けられたばねと、
前記重錘の上下動の振動を減衰する減衰器と、
前記両側パイプの外面の上端部及び下端部に固着された取付アングルと
を備えたことを特徴とするものである。（請求項１）。
【０００８】
以上のように構成された本発明の制振装置は、重錘とばねと減衰器を収納した箱体が、断面が矩形状の上側パイプ、下側パイプ、両側パイプの４本を接合して形成された枠体と、該枠体の裏面に固着された裏板と、前記枠体の前面に着脱自在に取り付けられた蓋板とにより構成され、幅より高さが小さく、さらに奥行が小さい前後方向が扁平な直方体形状に形成されているため、歩道橋の高欄に、高欄に平行に、即ち高欄を構成する空間に、埋め込んだ形で容易に取り付けることができるようになり、歩行者の歩行に影響を与えなく、外観も良好であり、新設は勿論既設の歩道橋に簡単に取り付けることができる。
【０００９】
さらに、箱体の前面蓋板の開放または取り外しにより、メンテナンス及び調整・修理がきわめて容易である。
【００１０】
また、固定支柱が、箱体内の両側に上下方向に固定され、上・下端部が上側パイプ・下側パイプの内面に固着された支持具により支持され、重錘が、幅より高さが小さく、さらに奥行が小さい前後方向が扁平な横長直方体形状のブロック状に形成され、重錘の両側部に形成された上下方向の透孔の上端部・下端部にリニアブッシュが取り付けられ、そのリニアブッシュに固定支柱が挿入され、重錘を固定支柱をガイドとして上下動自在にし、重錘の上面にボルトにより複数枚の調整錘が取り付けられ、両固定支柱の内方に、重錘の下面と下側パイプの上面、または重錘の上面と上側パイプの下面、あるいは重錘の下面及び上面と、下側パイプの上面及び上側パイプの下面の両方との間にばねが設けられ、重錘の上下動の振動を減衰する減衰器が設けられているため、制振装置の種々の構成物を、箱体にコンパクトに収納することができ、箱体に種々の構成物が一体に収納されているため、制振装置の移動、運搬等が簡単で、取扱いが容易である。
その上、箱体の枠体を形成した両側パイプの外面の上端部及び下端部に取付アングルが固着されているため、制振装置を歩道橋の高欄に簡単に取り付けることができる。
【００１１】
さらに、減衰器を、箱体の枠体を形成した両側パイプ内面の上部・下部に固着された固着板と、両側の上・下の固着板に前後方向に調整自在に取り付けられた両側の上・下の支持板と、上・下の支持板に固着された上・下の取付板と、上端部・下端部が上・下の取付板に左右方向に調整自在に取り付けられた枠体に平行な上下方向の固定銅板と、重錘の両側面に枠体に平行に突設され、固定銅板の前方に位置した固定鉄板と、鉄板の固定銅板側の面に固着され、固定銅板の前方に位置した複数個の永久磁石とにより構成することが好ましい。（請求項２）。この場合、減衰器を簡単な構造で安価にすることができる。
また、固定鉄板を固定銅板の前方と後方とに設け、永久磁石を、各鉄板の固定銅板側の面に、固定銅板の前方及び後方に固定銅板を挟むように設けることが望ましい。（請求項３）。
【００１２】
その上、前記制振装置の箱体の枠体を形成した両側パイプの上部取付アングルを、床板両側の高欄笠木の下面に取り付け、両側パイプの下部取付アングルを、床板の上面に取り付け、制振装置を前記高欄に平行に取り付け、箱体の蓋板を歩道側に位置させ、制振装置の奥行が高欄の奥行より大きくなく、制振装置の前面が高欄の内面より出ないようにすることにより、取り付け作業が殆ど床板上となり、作業が容易で安全であり、新設・既設を問わず、歩道橋に制振装置を簡単に取り付けることができ、かつ、歩行者の歩行に影響を与えなく、外観も良好である。
【００１３】
【発明の実施の形態】
本発明の制振装置の実施の１形態を図１ないし図４を参照して説明する。１は箱体であり、幅及び高さに対し奥行が小さい前後方向が扁平な直方体形状であり、断面が矩形状の４本のパイプ２を接合して枠体３を形成し、枠体３の幅が高さより若干長く、枠体３の裏面に裏板４が固着され、枠体３の前面に蓋板５が着脱自在に取り付けられ、枠体３・裏板４・蓋板５により箱体１が構成されている。
【００１４】
６はガイドを構成する固定支柱であり、箱体１内の両側に上下方向に固定され、上・下端部が上側・下側パイプ２の内面に固着された支持具７により支持されている。
【００１５】
８はブロック状の重錘であり、幅より高さが小さく、さらに奥行が小さい前後方向が扁平な横長の直方体形状であり、両側部に上下方向の透孔９が形成されている。１０は透孔９の上端部・下端部に取り付けられたリニアブッシュであり、固定支柱６がリニアブッシュ１０を介して透孔９に挿入され、重錘８が固定支柱６をガイドとして上下動自在になっている。
【００１６】
１１は重錘８の上面にボルト１２により取り付けられた複数枚の調整錘であり、適宜増減して重錘８の重量が調整される。１３は重錘８の下面と枠体３内の下面、即ち下側パイプ２の上面との間に設けられた２個の圧縮ばねであり、両固定支柱６の内方に位置し、ばね１３の上端・下端は、重錘８及び下側パイプ２に固定されたばね支持具１４により支持されている。
【００１７】
１５は両側パイプ２内面の上部・下部に固着された固着板、１６は支持板であり、Ｌ形の取付板１７が一体に固着されている。１８は枠体３に平行な上下方向の固定銅板であり、銅板１８の上端部・下端板が上・下の取付板１７に左右方向に調整自在に取り付けられ、上・下の支持板１６が固着板１５に前後方向に調整自在に取り付けられている。
【００１８】
１９は重錘８の両側面に突設されたほぼ正方形の２枚ずつの鉄板であり、枠体３に平行であり、縦長の基板２０に直角方向に固着され、基板２０と鉄板１９のほぼ中央部に水平方向の補強板２１が固着され、２枚の鉄板１９が固定銅板１８の前方と後方とに位置している。２２は複数個の永久磁石であり、鉄板１９の固定銅板１８側の面に固着され、各永久磁石２２が、隙間を設けて固定銅板１８の前方及び後方に固定銅板１８を挟むようにして位置し、固定銅板１８と各永久磁石２２とにより減衰器が構成されている。
【００１９】
２３は上側パイプ２の下面中央部に固着された断面Ｕ字形の支持金具、２４は支持金具２３の下面に固着されたストッパであり、調整錘１１の上面が当接し、重錘８の上動位置を規制する。２５は取付アングルであり、両側パイプ２の外面の上端部・下端部に固着されている。
【００２０】
つぎに、前記形態の制振装置を歩道橋に取り付けた場合を、図５及び図６を参照して説明する。
２６は歩道橋、２７は歩道橋２６の桁、２８は床板、２９は床板２８の両側の高欄、３０は高欄２９の笠木（手摺）、３１は笠木３０の支柱、３２は中貫、３３は縦さんであり、前記制振装置３４が、両側上部の取付アングル２５が笠木３０の下面に、両側下部の取付アングル２５が床板２８の上面に、それぞれボルト等により付けられ、蓋板５が歩道側に位置し、高欄２９の奥行と制振装置３４の奥行は同一か、制振装置３４の方が小さく、制振装置３４の前面が高欄２９の内面より歩道側へ出なく、歩行の妨げにならない。
【００２１】
図７は既設の歩道橋２６の高欄２９を示し、この場合、図示の斜線部を除去することにより、簡単に制振装置３４を取り付けることができる。
【００２２】
そして、前記制振装置３４は、各永久磁石２２が重錘８とともに上下に振動し、各永久磁石２２と固定銅板１８の相対速度に比例した減衰力が得られる。
【００２３】
つぎに、重錘８は重い程制振効果が大きいが、歩道橋２６の振動重量に対し約１％の重量で、制振装置を付けない場合の振動を、１０分の１程度に抑制できる。
【００２４】
また、ばね１３の強さは、重錘８の振動が桁の振動とほぼ一致するよう設計し、重錘８の下方の前記圧縮ばね１３のほか、重錘８の上方にもばねを設置する場合もある。あるいは、重錘８を重錘８の上方のばねのみにより吊るようにしてもよい。
【００２５】
さらに、減衰器について、固定銅板１８と各永久磁石２２から構成される磁気ダンパーについて説明したが、この磁気ダンパーはメンテナンスが不要である。この磁気ダンパーの代りにエアダンパー・オイルダンパーを適用することもできる。
【００２６】
【発明の効果】
本発明は、以上説明したように構成されているので、以下に記載されるような効果を奏する。
請求項１に記載の制振装置は、重錘とばねと減衰器を収納した箱体が、断面が矩形状の上側パイプ、下側パイプ、両側パイプの４本を接合して形成された枠体と、該枠体の裏面に固着された裏板と、前記枠体の前面に着脱自在に取り付けられた蓋板とにより構成され、幅より高さが小さく、さらに奥行が小さい前後方向が扁平な直方体形状に形成されているため、歩道橋の高欄に、高欄に平行に、即ち高欄を構成する空間に、埋め込んだ形で容易に取り付けることができるようになり、歩行者の歩行に影響を与えなく、外観も良好であり、新設は勿論既設の歩道橋に簡単に取り付けることができる。
【００２７】
さらに、箱体１の前面蓋板５の開放または取り外しにより、メンテナンス及び調整・修理がきわめて容易である。
【００２８】
つぎに、請求項２に記載の制振装置は、請求項１記載の減衰器を、箱体の枠体を形成した両側パイプ内面の上部・下部に固着された固着板と、両側の上・下の固着板に前後方向に調整自在に取り付けられた両側の上・下の支持板と、上・下の支持板に固着された上・下の取付板と、上端部・下端部が上・下の取付板に左右方向に調整自在に取り付けられた枠体に平行な上下方向の固定銅板と、重錘の両側面に枠体に平行に突設され、固定銅板の前方に位置した固定鉄板と、鉄板の固定銅板側の面に固着され、固定銅板の前方に位置した複数個の永久磁石とにより構成することが好ましい。この場合、減衰器を簡単な構造で安価にすることができる。
【００２９】
また、請求項３に記載の制振装置は、請求項２に記載の減衰器において、固定鉄板を固定銅板の前方と後方とに設け、永久磁石を、各鉄板の固定銅板側の面に、固定銅板の前方及び後方に固定銅板を挟むように設けることが望ましい。
【００３０】
そして、請求項４に記載の歩道橋は、請求項１、２または３記載の制振装置を用い、その制振装置の箱体の枠体を形成した両側パイプの上部取付アングルを、床板両側の高欄笠木の下面に取り付け、両側パイプの下部取付アングルを、床板の上面に取り付け、制振装置を高欄に平行に取り付け、箱体の蓋板を歩道側に位置させ、制振装置の奥行が高欄の奥行より大きくなく、制振装置の前面が高欄の内面より出ないようにすることにより、取り付け作業が殆ど床板上となり、作業が容易で安全であり、新設・既設を問わず、歩道橋に制振装置を簡単に取り付けることができ、かつ、歩行者の歩行に影響を与えなく、外観も良好である。
【図面の簡単な説明】
【図１】本発明の制振装置の実施の１形態の蓋板を除去した一部切断正面図である。
【図２】Ａ、Ｂは図１の平面図及びIIＢ−IIＢ線断面図である。
【図３】Ａ、Ｂ、Ｃは図１の右側面図、IIIＢ−IIIＢ線断面図及びIIIＣ−IIIＣ線断面図である。
【図４】図２Ｂの一部の拡大図である。
【図５】本発明の歩道橋の１例の正面図である。
【図６】Ａ、Ｂは図５の一部の拡大図及び同切断側面図である。
【図７】歩道橋の一部の正面図である。
【符号の説明】
１箱体
６固定支柱
８重錐
９透孔
１３ばね
１８固定銅板
１９鉄板
２２永久磁石[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vibration damping device (tuned mass damper) and footbridge fitted with the damping device that can be easily applied to a pavement bridge.
[0002]
[Prior art]
Generally, in a relatively long pedestrian bridge, the natural frequency of the bridge girder approaches the pedestrian's pace, and the vibration caused by walking increases.
[0003]
By the way, in a large-sized pedestrian bridge, since the cross section is constituted by a box girder, a space portion of the box girder is large, and a vibration damping device is installed in the space portion.
[0004]
[Problems to be solved by the invention]
In a small-sized pedestrian bridge, the girder structure is an I-girder having an open section, and the girder height is low. Therefore, there is a problem that a vibration damping device cannot be incorporated in an underfloor space composed of a pedestrian bridge floor plate and an I-girder. .
[0005]
On the other hand, in the case of the large-sized pedestrian bridge, the damping device may be installed from the beginning, but if the damping result is inconvenient due to design or other reasons, it is not possible to increase the bending rigidity by changing the cross section of the girder. However, there is a problem that the cost is greatly increased.
[0006]
The present invention noted the above points, in addition can be installed easily for small footbridge, also be mounted easily with respect to existing footbridge not affect walking pedestrians easily sidewalk bridge An object of the present invention is to provide a damping device that can be installed, and to provide a pedestrian bridge to which the damping device is attached.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the vibration damping device of the present invention comprises:
A vibration damping device attached to a railing of a pedestrian bridge,
A frame formed by joining four pipes of an upper pipe, a lower pipe, and both pipes each having a rectangular cross section, a back plate fixed to a back surface of the frame body, and a detachable front surface of the frame body. A rectangular parallelepiped box that is configured by an attached lid plate, is smaller in height than width, and has a small depth and a flat front and rear direction,
A fixed column that is fixed vertically on both sides of the box body and forms a guide whose upper and lower ends are supported by supports fixed to the inner surfaces of the upper pipe and the lower pipe;
A block-shaped weight having a horizontally-long rectangular parallelepiped shape in which the height is smaller than the width and the depth is smaller, and the front-rear direction is flat,
Vertical through holes formed on both sides of the weight,
A linear bush attached to the upper end / lower end of the through-hole, the fixed support being inserted therein, and the weight being vertically movable using the fixed support as a guide;
A plurality of adjustment weights attached to the weight by bolts,
Positioned inside the fixed posts, the lower surface of the weight and the upper surface of the lower pipe, or the upper surface of the weight and the lower surface of the upper pipe, or the lower surface and the upper surface of the weight, and the lower side A spring provided between both the upper surface of the pipe and the lower surface of the upper pipe,
An attenuator for attenuating vertical vibration of the weight,
A mounting angle fixed to the upper end and the lower end of the outer surface of the two-sided pipe;
It is characterized by having. (Claim 1).
[0008]
In the vibration damping device of the present invention configured as described above, the box housing the weight, the spring, and the attenuator is formed by joining four upper, lower, and both-side pipes each having a rectangular cross section. The frame includes a formed frame, a back plate fixed to the back surface of the frame, and a cover plate detachably attached to the front surface of the frame, the height being smaller than the width, and the depth being smaller. Since the front-rear direction is formed in a flat rectangular parallelepiped shape, it can be easily mounted in an elevated form on the pedestrian bridge in parallel with the parallel, that is, in a space that constitutes the railway, in a buried form. It has good appearance and can be easily installed on existing pedestrian bridges as well as new ones.
[0009]
Further, maintenance, adjustment and repair are extremely easy by opening or removing the front cover plate of the box.
[0010]
In addition, fixed supports are vertically fixed to both sides in the box body, and upper and lower ends are supported by supports fixed to the inner surfaces of the upper pipe and the lower pipe, and the weight is smaller in height than the width. In addition, a linear bush is attached to the upper and lower ends of the vertical through holes formed on both sides of the weight, and the linear bush is formed in a horizontally long rectangular parallelepiped block shape in which the front-rear direction is further flat and the depth is smaller. A fixed support is inserted into the weight, the weight can be moved up and down using the fixed support as a guide, and a plurality of adjustment weights are attached to the upper surface of the weight by bolts. A spring is provided between the upper surface of the side pipe, or the upper surface of the weight and the lower surface of the upper pipe, or the lower surface and the upper surface of the weight, and both the upper surface of the lower pipe and the lower surface of the upper pipe. Damper for damping dynamic vibration Because provided, for the various configurations of the vibration damping device can be compactly stored in the box body, the various constituents in the box body is housed integrally with the movement of the damping device, transportation And the like are easy to handle.
In addition, since the mounting angles are fixed to the upper and lower ends of the outer surfaces of the pipes on both sides forming the frame of the box, the vibration damping device can be easily mounted on the railing of the pedestrian bridge.
[0011]
Furthermore, the attenuator is fixed to the upper and lower portions of the inner surface of the pipes on both sides forming the frame of the box body, and the upper and lower portions of the upper and lower fixing plates on both sides are adjustably mounted in the front-rear direction.・ The lower support plate, the upper and lower mounting plates fixed to the upper and lower support plates, and the frame body whose upper and lower ends are attached to the upper and lower mounting plates so as to be adjustable in the left-right direction. A parallel fixed copper plate in the vertical direction, a fixed iron plate projecting parallel to the frame on both sides of the weight and positioned in front of the fixed copper plate, and fixed to the fixed copper plate side of the iron plate, in front of the fixed copper plate It has preferably be constituted by a plurality of permanent magnets positioned. (Claim 2). In this case, the attenuator can be inexpensive with a simple structure.
Further, it is preferable that fixed iron plates are provided in front of and behind the fixed copper plate, and permanent magnets are provided on the surface of each iron plate on the fixed copper plate side so as to sandwich the fixed copper plate in front of and behind the fixed copper plate. (Claim 3).
[0012]
In addition, the upper mounting angles of both side pipes forming the frame of the box body of the vibration damping device are mounted on the lower surface of the balustrade on both sides of the floor plate, and the lower mounting angles of both side pipes are mounted on the upper surface of the floor plate. The device is mounted parallel to the railing, the lid of the box is positioned on the sidewalk, the depth of the damping device is not greater than the depth of the railing, and the front of the damping device does not protrude from the inner surface of the railing. Due to this, the installation work is almost on the floorboard, the work is easy and safe, regardless of new construction or existing, the vibration damping device can be easily installed on the pedestrian bridge, and without affecting the walking of pedestrians, The appearance is also good.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of a vibration damping device according to the present invention will be described with reference to FIGS. Reference numeral 1 denotes a box, which has a rectangular parallelepiped shape having a small depth with respect to width and height and a flat front-rear direction and a rectangular cross-section, and joining four pipes 2 to form a frame 3. Is slightly longer than the height, a back plate 4 is fixed to the back surface of the frame 3, a cover plate 5 is detachably attached to the front surface of the frame 3, and the box is formed by the frame 3, the back plate 4, and the cover plate 5. The body 1 is made up.
[0014]
Reference numeral 6 denotes a fixed support that constitutes a guide. The support 6 is vertically fixed to both sides of the box 1 and is supported by a support member 7 whose upper and lower ends are fixed to the inner surfaces of the upper and lower pipes 2.
[0015]
Reference numeral 8 denotes a block-shaped weight, which has a height smaller than the width and has a horizontally long rectangular parallelepiped shape with a small depth and a flat front-rear direction, and has vertical through holes 9 formed on both sides. Reference numeral 10 denotes a linear bush attached to the upper end and the lower end of the through hole 9. The fixed support 6 is inserted into the through hole 9 via the linear bush 10, and the weight 8 can move up and down using the fixed support 6 as a guide. It has become.
[0016]
Reference numeral 11 denotes a plurality of adjusting weights attached to the upper surface of the weight 8 by bolts 12, and the weight of the weight 8 is adjusted by appropriately increasing or decreasing. Numeral 13 denotes two compression springs provided between the lower surface of the weight 8 and the lower surface in the frame 3, that is, the upper surface of the lower pipe 2. The upper and lower ends of are supported by a spring support 14 fixed to the weight 8 and the lower pipe 2.
[0017]
Reference numeral 15 denotes a fixing plate fixed to the upper and lower portions of the inner surface of the pipes 2 on both sides, and 16 denotes a support plate, to which an L-shaped mounting plate 17 is integrally fixed. Reference numeral 18 denotes a vertically fixed copper plate parallel to the frame 3, and upper and lower end plates of the copper plate 18 are attached to upper and lower mounting plates 17 so as to be adjustable in the left-right direction. It is attached to the fixing plate 15 so as to be adjustable in the front-rear direction.
[0018]
Reference numeral 19 denotes two substantially square iron plates protruding from both sides of the weight 8, parallel to the frame 3, and fixed to the vertically long substrate 20 at right angles. A horizontal reinforcing plate 21 is fixed at the center, and two iron plates 19 are located in front of and behind the fixed copper plate 18. Reference numeral 22 denotes a plurality of permanent magnets, which are fixed to the surface of the iron plate 19 on the fixed copper plate 18 side, and each permanent magnet 22 is positioned so as to sandwich the fixed copper plate 18 in front of and behind the fixed copper plate 18 with a gap, The fixed copper plate 18 and each permanent magnet 22 constitute an attenuator.
[0019]
23 is a U-shaped support bracket fixed to the center of the lower surface of the upper pipe 2, and 24 is a stopper fixed to the lower surface of the support bracket 23, the upper surface of the adjustment weight 11 abuts, and the weight 8 moves upward. Regulate position. Reference numeral 25 denotes a mounting angle, which is fixed to the upper end and the lower end of the outer surface of the pipes 2 on both sides.
[0020]
Next, a case where the above-described vibration damping device is attached to a pedestrian bridge will be described with reference to FIGS.
26 is a pedestrian bridge, 27 is a girder of the pedestrian bridge 26, 28 is a floorboard, 29 is a railing on both sides of the floorboard 28, 30 is a bamboo (handrail) of a railing 29, 31 is a pillar of a kasagi 30, 32 is a middle rail, 33 is a vertical bridge The vibration damping device 34 is attached to the lower surface of the coping 30 with the upper mounting angle 25 on both sides, and the lower mounting angle 25 is fixed to the upper surface of the floor plate 28 with bolts and the like, and the cover plate 5 is positioned on the sidewalk side. However, the depth of the railing 29 and the depth of the vibration damping device 34 are the same, or the depth of the vibration damping device 34 is smaller, and the front surface of the vibration damping device 34 does not protrude from the inner surface of the railing 29 to the sidewalk, and does not hinder walking.
[0021]
FIG. 7 shows the railing 29 of the existing pedestrian bridge 26. In this case, the vibration damping device 34 can be easily attached by removing the hatched portions shown.
[0022]
In the vibration damping device 34, each permanent magnet 22 vibrates up and down together with the weight 8, and a damping force proportional to the relative speed between each permanent magnet 22 and the fixed copper plate 18 is obtained.
[0023]
Next, while the weight 8 is heavier, the damping effect is greater, but the weight is about 1% of the vibration weight of the pedestrian bridge 26, and the vibration without the vibration damping device can be suppressed to about 1/10.
[0024]
The strength of the spring 13 is designed so that the vibration of the weight 8 substantially matches the vibration of the spar, and a spring is provided above the weight 8 in addition to the compression spring 13 below the weight 8. In some cases. Alternatively, the weight 8 may be suspended only by the spring above the weight 8.
[0025]
Further, as for the attenuator, the magnetic damper including the fixed copper plate 18 and each permanent magnet 22 has been described, but this magnetic damper requires no maintenance. An air damper or an oil damper can be applied instead of the magnetic damper.
[0026]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
The vibration damping device according to claim 1, wherein the box housing the weight, the spring, and the attenuator is formed by joining four upper pipes, lower pipes, and both pipes each having a rectangular cross section. Body, a back plate fixed to the back surface of the frame body, and a lid plate detachably attached to the front surface of the frame body, the height is smaller than the width, and the depth is small. Since it is formed in a rectangular parallelepiped shape, it can be easily mounted in the form of a pedestrian bridge in parallel with the railing, that is, in the space constituting the railing, in an embedded form, which affects the walking of pedestrians. It has good appearance and can be easily installed on existing pedestrian bridges as well as new ones.
[0027]
Further, by opening or removing the front cover plate 5 of the box 1, maintenance, adjustment and repair are extremely easy.
[0028]
Next, a vibration damping device according to a second aspect of the present invention provides a damping device according to the first aspect, wherein the damper according to the first aspect is fixed to upper and lower portions of inner surfaces of both side pipes on which a frame of a box is formed; The upper and lower support plates on both sides, which are attached to the lower fixing plate so as to be adjustable in the front-rear direction, the upper and lower mounting plates fixed to the upper and lower support plates, and the upper and lower ends A fixed copper plate in the vertical direction parallel to the frame attached to the lower mounting plate so as to be adjustable in the left and right direction, and a fixed iron plate protruding on both sides of the weight parallel to the frame and positioned in front of the fixed copper plate When, is fixed to the surface of the fixed copper plate side of the steel plate, it is not preferable to configure the a plurality of permanent magnets positioned in front of the fixed copper plate. In this case, the attenuator can be inexpensive with a simple structure.
[0029]
In the vibration damping device according to claim 3, in the attenuator according to claim 2, fixed iron plates are provided in front and rear of the fixed copper plate, and permanent magnets are provided on a surface of each iron plate on the fixed copper plate side, It is desirable to provide the fixed copper plate in front of and behind the fixed copper plate.
[0030]
The pedestrian bridge according to claim 4 uses the vibration damping device according to claim 1, 2, or 3, and attaches the upper mounting angles of both side pipes forming the frame of the box of the vibration damping device to both sides of the floor plate. Attach it to the underside of the balustrade, attach the lower mounting angles of the pipes on both sides to the upper surface of the floorboard, attach the damping device parallel to the tall, and place the lid of the box body on the sidewalk side. The height of the damping device is not larger than the depth of the rail and the front of the damping device does not protrude from the inner surface of the railing, so the installation work is almost on the floorboard, work is easy and safe, and it is possible to control the pedestrian bridge regardless of whether it is new or existing. The vibration device can be easily attached, the pedestrian's walking is not affected, and the appearance is good.
[Brief description of the drawings]
FIG. 1 is a partially cut front view of a vibration damping device according to an embodiment of the present invention, in which a cover plate is removed.
FIGS. 2A and 2B are a plan view and a cross-sectional view taken along line IIB-IIB of FIG.
FIGS. 3A, 3B, and 3C are a right side view, a sectional view taken along line IIIB-IIIB, and a sectional view taken along line IIIC-IIIC of FIG.
FIG. 4 is an enlarged view of a part of FIG. 2B.
FIG. 5 is a front view of an example of the pedestrian bridge according to the present invention.
6A and 6B are an enlarged view of a part of FIG. 5 and a cut side view thereof.
FIG. 7 is a front view of a part of the pedestrian bridge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Box 6 Fixed support 8 Weight cone 9 Through hole 13 Spring 18 Fixed copper plate 19 Iron plate 22 Permanent magnet

Claims

A vibration damping device attached to a railing of a pedestrian bridge,
A frame formed by joining four pipes of an upper pipe, a lower pipe, and both pipes each having a rectangular cross section, a back plate fixed to a back surface of the frame body, and a detachable front surface of the frame body. A rectangular parallelepiped box that is configured by an attached lid plate, is smaller in height than width, and has a small depth and a flat front and rear direction ,
A fixed column that is fixed vertically on both sides of the box body and forms a guide whose upper and lower ends are supported by supports fixed to the inner surfaces of the upper pipe and the lower pipe;
A block-shaped weight having a horizontally-long rectangular parallelepiped shape in which the height is smaller than the width and the depth is smaller, and the front-rear direction is flat ,
Vertical through holes formed on both sides of the weight,
A linear bush attached to the upper end / lower end of the through-hole, the fixed support being inserted therein, and the weight being vertically movable using the fixed support as a guide;
A plurality of adjustment weights attached to the weight by bolts,
Positioned inside the fixed posts, the lower surface of the weight and the upper surface of the lower pipe, or the upper surface of the weight and the lower surface of the upper pipe, or the lower surface and the upper surface of the weight, and the lower side A spring provided between both the upper surface of the pipe and the lower surface of the upper pipe ,
An attenuator for attenuating vertical vibration of the weight,
A mounting angle fixed to the upper end and the lower end of the outer surface of the two-sided pipe;
Damping apparatus characterized by comprising a.

The attenuator is
Fixing plates fixed to the upper and lower portions of the inner surface of the pipes on both sides forming the frame of the box,
Upper and lower support plates on both sides, which are attached to the upper and lower fixing plates on both sides so as to be adjustable in the front-rear direction,
Upper and lower mounting plates fixed to the upper and lower support plates,
An upper and lower fixed copper plate parallel to the frame body, which is attached to the upper and lower mounting plates so as to be adjustable in the left-right direction,
A fixed iron plate protruded from both sides of the weight in parallel with the frame body and positioned in front of the fixed copper plate,
A plurality of permanent magnets fixed to the surface of the iron plate on the side of the fixed copper plate and positioned in front of the fixed copper plate;
Damping apparatus according to claim 1, characterized in that it consists of.

The attenuator is
Fixing plates fixed to the upper and lower portions of the inner surface of the pipes on both sides forming the frame of the box ,
Upper and lower support plates on both sides, which are attached to the upper and lower fixing plates on both sides so as to be adjustable in the front-rear direction,
Upper and lower mounting plates fixed to the upper and lower support plates,
An upper and lower fixed copper plate parallel to the frame body, which is attached to the upper and lower mounting plates so as to be adjustable in the left-right direction ,
The projecting parallel to the frame on both sides of the weight, a fixed iron plate by two substantially square located in front and rear of the fixed copper plate,
The fixed to a surface of the fixed copper plate side of the steel plate, wherein the control according to claim 1 Symbol placement so as to sandwich the fixed copper plate, characterized in that it consists of a plurality of permanent magnets positioned in front of and behind the fixed copper plate Shaker.

An upper mounting angle of both side pipes forming a frame of the box of the vibration damping device according to claim 1, 2 or 3 , is attached to a lower surface of a balustrade on both sides of a floor plate ,
A lower mounting angle of the pipes on both sides is attached to an upper surface of the floorboard,
The vibration damping device is mounted parallel to the railing ,
The cover plate of the box is located on the sidewalk side,
The depth of the vibration damping device is not greater than the depth of the high row,
A pedestrian bridge, wherein a front surface of the vibration damping device does not protrude from an inner surface of the railing.