JP3871288B2

JP3871288B2 - Vibration sensor mounting device and vibration measuring method

Info

Publication number: JP3871288B2
Application number: JP31898197A
Authority: JP
Inventors: 吉和齋藤
Original assignee: East Japan Railway Co
Current assignee: East Japan Railway Co
Priority date: 1997-11-05
Filing date: 1997-11-05
Publication date: 2007-01-24
Anticipated expiration: 2017-11-05
Also published as: JPH11142230A

Description

【０００１】
【発明の属する技術分野】
本発明は、振動測定に用いる感振器を被測定物に取り付けるための感振器取付装置、及びこの感振器取付装置を用いた振動測定方法に関するものである。
【０００２】
【従来の技術】
橋りょうの橋脚の検査手法の一つとして、橋脚の振動測定を行って橋脚の固有振動数を求め、その数値に基いて橋脚の健全度を判定する方法が用いられている。この振動測定は、振動を検出する感振器を橋脚に取り付け、重錘等により橋脚の側壁を衝打することによって振動を発生させ、この振動を各感振器で測定することにより行われる。
【０００３】
上記した橋りょうの振動測定に当っては、橋脚の固有振動数を決定する必要があるため、橋脚の上段部、中段部、下段部にそれぞれ感振器を取り付け、各感振器のデータを得た後、これらを解析する必要がある。橋脚上段部については、橋りょう検査用足場等が設けられていることが多いため、この足場を利用することができ、また感振器の取付についても、橋脚天端面上に感振器を載置するだけでよい。
【０００４】
しかし、橋脚の中段部や下段部に感振器を取り付ける場合には、垂直面又はほぼ垂直な傾斜面である橋脚側壁面上に感振器を落下しないように固定する必要があり、さらに橋脚の振動を検出するため感振器の振動検出部を橋脚側壁面に密着させる必要がある。このような感振器の固定方法としては、接着剤を用いる方法（以下、「接着法」という。）と、アンカーボルトを用いる方法（以下、「アンカーボルト法」という。）がある。
【０００５】
また、橋脚の中段部や下段部に感振器を取り付ける場合の作業方法については、橋脚の基部側から上方に登って取付位置に到達し取付作業を行う方法、あるいは橋脚の天端側から下方に降りて取付位置に到達し取付作業を行う方法があり、これらの方法としては、脚立やハシゴ等を用いる方法（以下、「脚立法」という。）、高所作業専用の自動車を用いる方法（以下、「高所作業車法」という。）、縄ハシゴを用いる方法（以下、「縄ハシゴ法」という。）、架設足場を用いる方法（以下、「架設足場法」という。）等がある。
【０００６】
【発明が解決しようとする課題】
しかし、上記した従来の感振器固定方法や感振器取付作業方法においては、以下のような問題があった。
【０００７】
（１）接着法では、接着箇所に粗面（微少凹凸面）を形成するため接着箇所のケレン清掃を行う必要があり、このケレン清掃の程度により橋脚側壁面と感振器との間の接着強度にバラツキが生じる。また、接着剤は、硬化するまで（例えば、３〜５分）の間、押圧する必要がある。さらに、振動測定終了後は、バール等の工具を用いて橋脚側壁面から感振器を剥離させる必要がある。このように、振動測定の前後に種々の予備作業が必要であり煩雑である。
【０００８】
（２）アンカーボルト法では、感振器設置箇所のケレン処理や清掃は不要であるが、アンカーボルトを挿入するための挿入孔を穿孔する必要がある。穿孔には振動ドリル等の動力工具を用いるが、反力をとる必要があり、脚立や縄ハシゴ等の簡易な作業足場では作業者が不安定な状態となり、墜落等の危険性がある。また、感振器てっ去時には、ボルトを外すだけでよいが、アンカー本体は橋脚躯体内に残されることになり、橋脚を傷めることになる。
【０００９】
（３）脚立法では、脚立やハシゴにより登れる高さは５ｍ程度が限度であり、それ以上の高さの箇所に脚立やハシゴで登ろうとすると墜落等の危険性がある。また、基本的に橋脚の基部が河原、道路等の場合に用いられる方法であり、橋脚の基部が流水の場合には、その水深、流速がある程度以上大きいと利用できない。
【００１０】
（４）高所作業車法は、橋脚基部まで作業車が進入可能な場所以外では利用できない。
【００１１】
（５）縄ハシゴ法では、橋脚天端から縄ハシゴを吊り下げ、これを足場として作業を行う方法である。橋脚位置が流水内でも対応可能だが、感振器をアンカーボルトで固定する場合の穿孔作業や、接着剤で固定された感振器を剥離させるてっ去作業等、反力が必要な作業では作業者が不安定状態となりやすく、墜落の危険性がある。
【００１２】
（６）架設足場法では、感振器取付箇所に直接足場を架設し、これを利用して感振器取付作業を行う方法である。橋脚の立地条件に応じて、橋脚基部からの構築、又は橋脚天端からの吊り下げのいずれかの架設方法を選定可能である。しかし、架設・てっ去に労力と日数がかかるため費用が高くなる。感振器取付作業における墜落事故の危険性は小さくなるが、架設足場自体の架設・てっ去時における墜落事故の危険性がある。
【００１３】
本発明は上記の問題を解決するためになされたものであり、本発明の解決しようとする課題は、感振器の取付が容易、安全で費用が低廉でありかつ被測定物への影響の少ない感振器取付装置及び振動測定方法を提供することにある。
【００１４】
【課題を解決するための手段】
上記課題を解決するため、本発明に係る感振器取付装置は、フレームと、前記フレーム上の一点である結合点付近に接続されるとともに前記フレーム内の平面であるフレーム面から垂直に両側へ同一長さで延設された第１腕状部及び第２腕状部を有する吊支持部材と、前記フレームに配設された重錘を備え、垂直又は傾斜した被測定壁面を有する被測定物の前記被測定壁面上の被測定箇所の振動を検出する感振器を前記重錘とは異なる前記フレームの位置に装着し、前記第１腕状部の端部付近と前記第２腕状部の端部付近とをワイヤーにより吊り支持し、かつ、前記フレーム面内での前記結合点まわりの前記重錘による力のモーメントの釣合により前記感振器を前記被測定箇所側に付勢し前記感振器を前記被測定箇所に圧着して取り付けることを特徴とする。
【００１５】
上記の感振器取付装置においては、好ましくは、前記フレームは、一方向に延在する第１脚状部材の一端と他の一方向に延在する第２脚状部材の一端とを結合することにより逆Ｖ字状に構成され、前記フレーム面は、前記フレームの前記逆Ｖ字状の部分を含む平面であり、前記重錘は、前記第２脚状部材の前記結合点とは逆側の端部付近に配設され、前記感振器は前記第１脚状部材の前記結合点とは逆側の端部付近に装着される。
【００１６】
また、上記の感振器取付装置においては、好ましくは、前記第１腕状部の端部付近には第１滑車が設けられるとともに、前記第２腕状部の端部付近には第２滑車が設けられ、前記ワイヤーは、上方から前記第１滑車の下部を経て前記第２滑車の下部へ掛け渡された後に上方へ戻されるように配線される。
【００１７】
また、上記の感振器取付装置においては、好ましくは、前記フレームの結合点付近には、前記フレーム面に垂直な第１関節軸線の回りに回転可能な第１関節が設けられ、前記吊支持部材は、前記第１関節に回転可能に接続される。
【００１８】
また、上記の感振器取付装置においては、好ましくは、前記フレームには、前記フレーム面に垂直な第２関節軸線の回りに回転可能な第２関節が設けられ、前記感振器は、前記第２関節に回転可能に接続される感振器保持部材に装着される。
【００１９】
また、上記の感振器取付装置においては、好ましくは、前記第２関節は、前記感振器保持部材の重心から偏心した位置に配置され、前記感振器が前記被測定箇所に密着することを補助するように構成される。
【００２０】
また、上記の感振器取付装置においては、好ましくは、前記感振器保持部材は板状部材であり、前記感振器取付装置の固有振動数が前記被測定物の固有振動数よりも大きくなるように前記板状部材の厚さが設定される。
【００２１】
また、上記の感振器取付装置においては、好ましくは、前記吊支持部材の前記被測定箇所の側には、前記フレーム面に垂直な車輪軸線の回りに回転可能な２個以上の誘導車輪が設けられるとともに、前記フレームには補助吊環が設けられ、前記感振器取付装置の昇降時に、前記第１腕状部の端部付近と前記第２腕状部の端部付近とが前記ワイヤーにより吊り支持されるとともに前記補助吊環が補助ワイヤーにより吊り支持され、前記誘導車輪が前記被測定壁面上を転動するように構成される。
【００２２】
また、上記の感振器取付装置においては、好ましくは、前記吊支持部材の前記フレームの側、及び前記フレームの前記吊支持部材の側には、前記感振器取付装置の昇降時に前記吊支持部材と前記フレームが相互移動しないように規制する規制手段が設けられる。
【００２３】
また、本発明に係る振動測定方法は、フレームと、前記フレーム上の一点である結合点付近に接続されるとともに前記フレーム内の平面であるフレーム面から垂直に両側へ同一長さで延設された第１腕状部及び第２腕状部を有する吊支持部材と、前記フレームに配設された重錘を備えた感振器取付装置を用い、前記重錘とは異なる前記フレームの位置に感振器を装着し、次いで、前記第１腕状部の端部付近と前記第２腕状部の端部付近とをワイヤーにより吊下することにより、垂直又は傾斜した被測定壁面を有する被測定物の前記被測定壁面上の被測定箇所の近傍に前記感振器取付装置を支持し、次いで、前記フレーム面内での前記結合点まわりの前記重錘による力のモーメントの釣合により前記感振器を前記被測定箇所側に付勢し前記感振器を前記被測定箇所に圧着して取り付け、次いで、前記感振器により前記被測定箇所の振動を検出することを特徴とする。
【００２４】
【発明の実施の形態】
以下、本発明の実施形態について、図面を参照しながら説明する。
【００２５】
図１は、本発明の一実施形態である感振器取付装置の構成を示す図であり、図１（Ａ）は側面図を、図１（Ｂ）は滑車付近の拡大側面図を、それぞれ示している。図２は、図１に示す感振器取付装置の正面図である。また、図３は、図１に示す感振器取付装置の背面図である。
【００２６】
図１〜３に示すように、この感振器取付装置１０は、基本的には、フレーム１４と、吊支持部材１６と、感振器保持部材３１と、重錘２６を備えて構成されている。
【００２７】
フレーム１４は、第１脚状部材１１と、第２脚状部材１２を有している。第１脚状部材１１は、鋼等からなり、一方向に延在する棒状又は管状に形成された部材である。また、第２脚状部材１２は、鋼等からなり、一方向に延在する棒状又は管状に形成された部材である。フレーム１４は、第１脚状部材１１の一端と第２脚状部材１２の一端とが、結合部材１３ａ，１３ｂと結合ボルト３６により結合され、図１（Ａ）に示すように逆「Ｖ」字状に形成されている。
【００２８】
上記したフレーム１４におけるＶ字状の部分の尖角部の頂点（以下、「結合点」という。）付近には、第１関節１５が設けられている。第１関節１５は、円形の第１関節孔（図示せず）に円柱状の第１関節部材（図示せず）が挿通された構造を有しており、第１関節孔を有する部材、又は第１関節部材は、フレーム１４のＶ字状の部分を含んで形成される平面（以下、「フレーム面」という。）に垂直な直線である第１関節軸線の回りに回転可能となっている。フレーム１４には、上記した第１関節孔又は第１関節部材の一方が設けられている。
【００２９】
吊支持部材１６は、図２，３に示すような略「Ｔ」字状の部材である。吊支持部材１６の鉛直方向の部分１６ａの下端には上記した第１関節孔又は第１関節部材の他方が設けられ、フレーム１４に設けられた第１関節孔又は第１関節部材の一方と嵌合し、両者の一方は他方に対して回転可能に接続されている。
【００３０】
また、吊支持部材１６の鉛直方向部１６ａの上部からは、水平方向の両側に第１腕状部１７と第２腕状部１８が延設されている。鉛直方向部１６ａからの第１腕状部１７の延設長は、鉛直方向部１６ａからの第２腕状部１８の延設長と等しく設定されている。また、第１腕状部１７と第２腕状部１８の延設方向は、フレーム面に対して垂直となっている。
【００３１】
上記のような吊支持部材１６の構成により、吊支持部材１６は、図１（Ａ）において、第１関節１５を回転中心として、時計回り方向又は反時計回り方向へ所定角度だけ回転可能となっている。
【００３２】
上記した第１腕状部１７と第２腕状部１８は、図１（Ｂ）に示すように、２枚の板材の間に所定空隙を配して平行に配置した構造を有している。第１腕状部１７の水平端部付近の空隙内には、図２，３に示すように、第１滑車１９が設けられている。また、第２腕状部１８の水平端部付近の空隙内には、図２，３に示すように、第２滑車２０が設けられている。
【００３３】
また、図１（Ｂ）に示すように、第２滑車２０は、第２腕状部１８に取り付けられた第２滑車軸２０ａの回りに回転可能となっている。第２滑車軸２０ａは、フレーム面に対して平行となっている。第１滑車１９についても第２滑車２０と全く同様の構成を有しており、第１腕状部１７に取り付けられた第１滑車軸１９ａ（図２，３参照）の回りに回転可能となっている。第１滑車軸１９ａもフレーム面に対して平行となっている。
【００３４】
この場合、第１滑車１９と第２滑車２０は、吊支持部材１６の鉛直方向部１６ａの鉛直軸に関して対称な位置に配置されている。したがって、吊支持部材１６の鉛直方向部１６ａの鉛直軸から第１滑車軸１９ａの中心までの水平距離と、吊支持部材１６の鉛直方向部１６ａの鉛直軸から第２滑車軸２０ａの中心までの水平距離は等しく設定されている。
【００３５】
また、図２，３に示すように、第１腕状部１７の水平端部付近には、第１滑車１９の斜め上方の位置に、第１ワイヤー出入口１７ａが設けられており、第１腕状部１７内の空間と外部とが連通している。また、図１（Ｂ）及び図２，３に示すように、第２腕状部１８の水平端部付近には、第２滑車２０の斜め上方の位置に、第２ワイヤー出入口１８ａが設けられており、第２腕状部１８内の空間と外部とが連通している。
【００３６】
また、図１（Ｂ）に示すように、第２滑車２０の外周には半円形断面のワイヤー収容溝が形成されている。また、図示はしていないが、第１滑車１９についても、同様なワイヤー収容溝が設けられている。
【００３７】
また、図２，３に示すように、吊支持部材１６の第１脚状部材１１の側（被測定箇所の側）には、第１腕状部１７の水平端部付近に、車輪取付部２２が取り付けられ、車輪取付部２２には誘導車輪２４が取り付けられている。誘導車輪２４は、フレーム面に垂直な車輪軸２４ａの軸線の回りに回転可能な構成となっている。また、図１〜３に示すように、吊支持部材１６の第１脚状部材１１の側には、第２腕状部１８の水平端部付近に、車輪取付部２３が取り付けられ、車輪取付部２３には誘導車輪２５が取り付けられている。誘導車輪２５は、フレーム面に垂直な車輪軸２５ａの軸線の回りに回転可能な構成となっている。
【００３８】
また、上記した第１脚状部材１１の図１〜３における下端付近、すなわち第１脚状部材１１においてフレーム１４の結合点とは逆側となる端部付近には、棒状の先端部材１１ａが結合ボルト３７により結合されている。また、先端部材１１ａの先端、すなわち先端部材１１ａにおいて第１脚状部材１１との結合点とは逆側となる端部には、第２関節３０が設けられている。
【００３９】
第２関節３０は、円形の第２関節孔（図示せず）に円柱状の第２関節部材（図示せず）が挿通された構造を有しており、第２関節孔を有する部材、又は第２関節部材は、フレーム面に垂直な直線である第２関節軸線の回りに回転可能となっている。先端部材１１ａには、上記した第２関節孔又は第２関節部材の一方が設けられている。
【００４０】
感振器保持部材３１は、図１，２に示すような略三角板状の部材である。感振器保持部材３１の一面には、上記した第２関節孔又は第２関節部材の他方が設けられ、先端部材１１ａに設けられた第２関節孔又は第２関節部材の一方と嵌合し、両者の一方は他方に対して回転可能に接続されている。また、感振器保持部材３１における第２関節３０の取付位置は、感振器保持部材３１の重心位置より図の上方に偏った位置となっている。また、感振器保持部材３１の図における下方には、ブロック状の補助重錘３３が取り付けられている。
【００４１】
上記のような感振器保持部材３１の構成により、感振器保持部材３１は、図１（Ａ）において、第２関節３０を回転中心として、時計回り方向又は反時計回り方向へ所定角度だけ回転可能となっている。
【００４２】
略三角板状の感振器保持部材３１の３つの隅角部には、図２に示すように、感振器３２ａ，３２ｂ，３２ｃが装着される。感振器３２ａ〜３２ｃは、図の左側の先端（以下、「振動検出端」という。）で接触している物体の振動（変位の加速度）を、圧電効果（ピエゾ抵抗効果）等を利用し、電気量として検出するセンサーである。各感振器３２ａ〜３２ｃには、振動を検出して得られた電気信号を計測装置等へ伝達するための導線等が接続されるが、図示は省略されている。
【００４３】
また、上記した第２脚状部材１２の図１〜３における下端付近、すなわち第２脚状部材１２においてフレーム１４の結合点とは逆側となる端部付近には、重錘２６が取り付けられている。重錘２６には、円環状の補助吊環２７が設けられている。
【００４４】
また、図１（Ａ）及び図３に示すように、吊支持部材１６の鉛直方向部１６ａの図における下端付近、すなわち第１関節１５付近には、係合突起３４が張り出すようにして取り付けられている。また、第２脚状部材１２の図における上端付近、すなわち第１関節１５付近には、係止部３５ａ，３５ｂが取り付けられている。
【００４５】
上記に感振器取付装置１０においては、第１脚状部材１１の長軸に対して直角となる方向の第１脚状部材１１と先端部材１１ａと感振器３２ａ〜３２ｃと感振器保持部材３１と補助重錘３３の合計重力をＦ1 とし、第１脚状部材１１側の重心位置からフレーム１４の結合点までのモーメントの腕の長さをＬ1 とし、第２脚状部材１２の長軸に対して直角となる方向の第２脚状部材１２と重錘２６の合計の重力の分力をＦ2 とし、第２脚状部材１２側の重心位置からフレーム１４の結合点までのモーメントの腕の長さをＬ2 としたとき、下式▲１▼が成立するように重錘２６の値が設定されている。
Ｆ1 ×Ｌ1 ＜Ｆ2 ×Ｌ2 ………▲１▼
【００４６】
上式▲１▼の左辺は、フレーム面内での結合点まわり（又は第１関節軸線まわり）の第１脚状部材１１側の力のモーメント、すなわち、フレーム１４全体を図１（Ａ）において反時計回り方向に回転させようとする力のモーメントである。また、上式▲１▼の右辺は、フレーム面内での結合点まわりの第２脚状部材１２側の力のモーメント、すなわち、フレーム１４全体を図１（Ａ）において時計回り方向に回転させようとする力のモーメントである。
【００４７】
したがって、上式▲１▼は、この感振器取付装置１０のフレーム１４のフレーム面内での結合点まわりの力のモーメントが、図１（Ａ）における時計回り方向に回転するように、重錘２６の値が設定されていることを表している。
【００４８】
次に、上記した感振器取付装置１０の作用について説明する。
まず、図４（Ａ），（Ｂ）に示す橋脚Ｐの天端に設けられた検査用足場Ｓ上の任意箇所にワイヤーロープ２１の一端を固定する。ここに、橋脚Ｐは、振動を測定する被測定物に相当している。また、図４において、Ｂは橋りょうを、Ｇは地面を、Ｗは橋脚Ｐの被測定壁面を、それぞれ示している。
【００４９】
次に、ワイヤーロープ２１の他端（以下、「調整端」という。）を、図２，３に示すように、例えば第１ワイヤー出入口１７ａから第１腕状部１７の内部空間へ入れ、第１滑車１９の下部を経て第２滑車２０の下部へ掛け渡した後に第２ワイヤー出入口１８ａから再び外部上方へ引き出すように配線する。
【００５０】
このようにすれば、第１腕状部１７の端部付近（第１滑車１９の左下端）と第２腕状部１８の端部付近（第２滑車２０の右下端）とをワイヤーロープ２１により安定に吊り支持することができる。第１滑車１９と第２滑車２０は、吊支持部材１６の鉛直方向部１６ａの鉛直軸に関して対称位置に配置されているから、吊支持部材１６は、図２，３及び図４（Ｂ）に示すように、傾くことなく正確に水平状態で吊下支持される。また、この際、第１滑車１９，第２滑車２０の外周には半円形断面のワイヤー収容溝が形成されているので、ワイヤーロープ２１は容易に外れないようになっている。
【００５１】
また、感振器取付装置１０は、上記のようにして吊下支持された場合に、垂直又は傾斜した被測定壁面Ｗが感振器３２ａ〜３２ｃの振動検出端と対向する側にある場合（図１（Ａ）参照）には、上記したフレーム面内での結合点まわりの力のモーメントの釣合により、フレーム１４全体が第１関節１５を回転中心として図１（Ａ）における時計回りに回転しようとする。この力により、感振器保持部材３１は、重錘２６側とは逆の略水平方向（図１（Ｂ）における左方向）に付勢される。このため、感振器３２ａ〜３２ｃの振動検出端が、被測定壁面Ｗの被測定箇所の側に圧着される。これにより、感振器３２ａ〜３２ｃは、被測定箇所に取り付けられる（図１（Ａ），図４（Ａ）参照）。この作用により、感振器３２ａ〜３２ｃの振動検出端は、被測定壁面Ｗが垂直面であっても傾斜面であっても良く追随して密着する。
【００５２】
また、感振器保持部材３１においては、第２関節３０が感振器保持部材３１の重心位置より図の上方に偏った位置に取り付けられ、かつ、感振器保持部材３１の図における下方に補助重錘３３が取り付けられている。このため、第２関節軸線まわりの力のモーメントの釣合により、感振器保持部材３１の面方向はほぼ垂直方向となる。この作用により、感振器３２ａ〜３２ｃの振動検出端は、被測定壁面Ｗが垂直面であっても傾斜面であってもさらに良く追随して密着するよう補助される。
【００５３】
また、ワイヤーロープ２１の調整端（例えば、図２，３における右上端）を繰り出し又は引き上げれば、橋脚Ｐの被測定壁面Ｗにおいて、感振器取付装置１０全体の高さ位置を調整することができる。これにより、振動測定を行いたい所望の高さ位置の被測定箇所に感振器３２ａ〜３２ｃをセットすることができる（図４（Ａ），（Ｂ）参照）。この際、橋脚Ｐの被測定壁面Ｗにおける被測定箇所の高さ位置が変ると、検査用足場Ｓからのワイヤーロープ２１の傾斜角度（図４（Ａ）参照）と開き角度（図４（Ｂ）参照）は変化するが、ワイヤーロープ２１は第１滑車１９と第２滑車１２によって支持され、かつ吊支持部材１６は第１関節軸線まわりに回転可能なため、ワイヤーロープ２１の角度の変化に支障無く追随することができる。
【００５４】
上記のようにして感振器３２ａ〜３２ｃを感振器取付装置１０により被測定箇所にセットした後は、例えば、重量の大きな衝撃用部材により橋脚Ｐの天端面や側壁面を衝打することによって振動を発生させ、この被測定箇所における応答を各感振器３２ａ〜３２ｃで測定する。
【００５５】
この際、上記した感振器保持部材３１は、その厚さが所定値よりも厚くなるように設定されている。これにより、感振器取付装置１０全体の固有振動数は１００Ｈｚ以上の値となっている。橋脚Ｐの固有振動数は、５〜２０Ｈｚ程度であるため、上記の構成により、測定時の振動により感振器取付装置１０が共振を起こし測定を阻害することがないように配慮されている。
【００５６】
次に、上記した感振器取付装置１０を橋脚Ｐの被測定壁面Ｗ上で昇降させる方法について、図５を参照しつつ説明する。
【００５７】
まず、ワイヤーロープ２１により、上述したようにして、吊支持部材１６を吊り支持するとともに、補助吊環２７に補助ワイヤーロープ２８を取り付けて吊り支持する。この際、補助ワイヤーロープ２８を引き上げ、第２脚状部材１２を第１関節軸線を回転中心として図５の上方へ引き上げると、係合突起３４が係止部３５ａ，３５ｂの間に嵌合する。これにより、第２脚状部材１２は、第１関節軸線を回転中心とした回転（相互移動）が一時的に阻止される。係合突起３４と係止部３５ａ，３５ｂは、規制手段を構成している。
【００５８】
また、この状態では、上記した重錘２６によるフレーム面内での結合点まわりの力のモーメントの釣合により、誘導車輪２４，２５が被測定壁面Ｗに圧着される。この状態で、ワイヤーロープ２１と補助ワイヤーロープ２８を同時に図５の上方へ引き上げれば、誘導車輪２４，２５が被測定壁面Ｗ上を転動し、感振器取付装置１０全体が図５の上方へ引っ掛かることなく移動する。また、ワイヤーロープ２１と補助ワイヤーロープ２８を同時に図５の下方へ繰り出せば、誘導車輪２４，２５が被測定壁面Ｗ上を転動し、感振器取付装置１０全体が図５の下方へ引っ掛かることなく移動する。このようにすれば、感振器３２ａ〜３２ｃを被測定壁面Ｗ上でこすったり引っ掛けたりすることなく、感振器取付装置１０全体を容易に昇降させることができる。
【００５９】
したがって、本実施形態の感振器取付装置１０によれば、被測定物である橋脚Ｐの天端の検査用足場Ｓからワイヤーロープ２１により感振器取付装置１０を吊下支持して被測定箇所に一時的に固定し、感振器３２ａ等による振動測定を行うようにしたので、従来の方法に比べて、感振器の取付が容易であり、ハシゴや架設足場等を用いないので墜落事故等の危険性が少なく、費用が低廉であり、かつ被測定物に悪影響を及ぼすことがない。
【００６０】
また、本実施形態の感振器取付装置１０によれば、フレーム面内での結合点まわりの力のモーメントの釣合により、感振器３２ａ等を被測定壁面Ｗに圧着させるようにしたので、従来の方法における接着剤やアンカーボルト等が不要となり、この点においても、感振器の取付が容易であり、作業に反力が不要であるため墜落事故等の危険性が少なく、費用が低廉であり、かつ被測定物に悪影響を及ぼすことがない。
【００６１】
なお、本発明は、上記実施形態に限定されるものではない。上記実施形態は、例示であり、本発明の特許請求の範囲に記載された技術的思想と実質的に同一な構成を有し、同様な作用効果を奏するものは、いかなるものであっても本発明の技術的範囲に包含される。
【００６２】
例えば、上記実施形態においては、フレーム（例えば１４）が、一方向に延在する第１脚状部材（例えば１１）と第２脚状部材（例えば１２）が逆Ｖ字状に結合されて構成された例について説明したが、本発明はこれには限定されず、他の構成のフレームであってもよい。例としては、第１脚状部材と第２脚状部材の間を平板状として全体を三角板状又は扇板状に形成したもの、第１脚状部材と第２脚状部材の間をトラス状の骨組みとしたもの、あるいは、フレーム面を対称面とするブロック状又は箱状の部材等であってもよい。要は、フレームは、感振器と重錘を保持可能で、力のモーメントの釣合により感振器を被測定箇所側に付勢可能な構成であればどのようなものであってもよいのである。
【００６３】
また、上記実施形態においては、吊支持部材（例えば１６）がＴ字状に形成された例について説明したが、本発明はこれには限定されず、他の構成の吊支持部材であってもよい。例としては、第１関節（例えば１５）の第１関節部材（図示せず）の両側に同一長の第１腕状部と第２腕状部を直接延設してもよい。
【００６４】
また、上記実施形態においては、第１滑車（例えば１９）と第２滑車（例えば２０）を備えた例について説明したが、本発明はこの例には限定されず、これらの構成要素は具備しなくてもよい。要は、第１腕状部（例えば１７）の端部付近と第２腕状部（例えば１８）の端部付近とがワイヤーにより吊り支持されればよい。
【００６５】
また、上記実施形態においては、第１関節（例えば１５）と第２関節（例えば３０）を備えた例について説明したが、本発明はこの例には限定されず、この構成要素は具備しなくてもよい。例えば、第１関節が無く、吊支持部材の回転ができない構成であっても、本発明の基本的作用である感振器の圧着作用は実現可能である。同様に、第２関節が無く、感振器保持部材の回転ができない構成であっても、本発明の基本的作用である感振器の圧着作用は実現可能である。
【００６６】
また、上記実施形態においては、感振器保持部材（例えば３１）が板状に形成された例について説明したが、本発明はこの例には限定されず、このような構成を採用しなくてもよい。感振器保持部材は、例えば、直方体状等のブロック状であってもよいし、箱状、骨組構造等であってもよい。
【００６７】
また、上記実施形態においては、感振器保持部材（例えば３１）が第２関節（例えば３０）に偏心して取り付けられ、補助重錘（例えば３３）を備えた例について説明したが、本発明はこの例には限定されず、このような構成を採用しなくてもよい。第２関節が回転可能であれば、特に上記の偏心や補助重錘の構成をとらなくても、本発明の基本的作用である感振器の圧着作用は実現可能である。
【００６８】
また、上記実施形態においては、感振器保持部材（例えば３１）の厚みを所定値よりも厚くした例について説明したが、本発明はこの例には限定されず、このような構成を採用しなくてもよい。この構成をとらなくても、本発明の基本的作用である感振器の圧着作用は実現可能である。
【００６９】
また、上記実施形態においては、誘導車輪（例えば２４，２５）と補助吊環（例えば２７）と係合突起（例えば３４）と係止部（例えば３５ａ，３５ｂ）を備えた例について説明したが、本発明はこの例には限定されず、これらの構成要素は具備しなくてもよい。また、これらを具備する場合には、誘導車輪（例えば２４，２５）と補助吊環（例えば２７）のみを備えてもよい。また、誘導車輪は、少なくとも第１腕状部と第２腕状部の対称位置に設けられた２個の車輪があればよく、個数も２個に限られず、３個以上であってもよい。また、補助吊環（例えば２７）の取付位置は、重錘（例えば２６）上に限定されず、第２脚状部材（例えば１２）上、あるいはフレーム（例えば１４）上であればどの位置であってもよい。
【００７０】
また、上記実施形態においては、被測定物として橋脚（例えばＰ）を、被測定壁面としてその側面（例えばＷ）例に挙げて説明したが、本発明はこの例には限定されない。例えば、被測定物は橋台や他の構築物であってもよい。また、被測定壁面は、垂直面又は傾斜面であればよい。
【００７１】
【発明の効果】
以上説明したように、本発明によれば、一方向に延在する第１脚状部材と第２脚状部材を結合して逆Ｖ字状のフレームを構成し、フレーム面から垂直に両側へ同一長さで延設された第１腕状部及び第２腕状部を有する吊支持部材をフレームの結合点付近に接続し、結合点の逆側の第２脚状部材の端部付近に重錘を配設し、垂直又は傾斜した被測定壁面の振動を検出する感振器を第１脚状部材の結合点とは逆側の端部付近に装着し、第１腕状部と第２腕状部の端部付近をワイヤーにより吊り支持し、フレーム面内での結合点まわりの重錘による力のモーメントの釣合により感振器を被測定箇所側に付勢し圧着して取り付けるようにしたので、感振器の取付が容易であり、取付作業が安全で、費用が低廉であり、かつ被測定物への影響が少ない、という利点がある。
【図面の簡単な説明】
【図１】本発明の一実施形態である感振器取付装置の構成を示す図であり、図１（Ａ）は側面図を、図１（Ｂ）は滑車付近の拡大側面図を、それぞれ示している。
【図２】図１に示す感振器取付装置の正面図である。
【図３】図１に示す感振器取付装置の背面図である。
【図４】図１に示す感振器取付装置を用いた振動測定方法を説明する図である。
【図５】図１に示す感振器取付装置の昇降方法を説明する図である。
【符号の説明】
１０感振器取付装置
１１第１脚状部材
１１ａ先端部材
１２第２脚状部材
１３ａ，１３ｂ結合部材
１４フレーム
１５第１関節
１６吊支持部材
１６ａ鉛直方向部
１７第１腕状部
１７ａ第１ワイヤー出入口
１８第２腕状部
１８ａ第２ワイヤー出入口
１９第１滑車
１９ａ第１滑車軸
２０第２滑車
２０ａ第２滑車軸
２０ｂワイヤー収容溝
２１ワイヤーロープ
２２，２３車輪取付部
２４誘導車輪
２４ａ車輪軸
２５誘導車輪
２５ａ車輪軸
２６重錘
２７補助吊環
２８補助ワイヤーロープ
３０第２関節
３１感振器保持部材
３２ａ，３２ｂ，３２ｃ感振器
３３補助重錘
３４係合突起
３５ａ，３５ｂ係止部
３６，３７結合ボルト
Ｂ橋りょう
Ｇ地面
Ｐ橋脚（被測定物）
Ｓ検査用足場
Ｗ被測定壁面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration sensor mounting apparatus for mounting a vibration sensor used for vibration measurement to an object to be measured, and a vibration measurement method using the vibration sensor mounting apparatus.
[0002]
[Prior art]
As one of the inspection methods for bridge piers, a method is used in which the vibration frequency of the pier is measured to determine the natural frequency of the pier and the soundness of the pier is determined based on the numerical value. This vibration measurement is performed by attaching a vibration detector for detecting vibration to the pier, generating a vibration by striking the side wall of the pier with a weight or the like, and measuring the vibration with each vibration detector.
[0003]
In the above bridge vibration measurement, it is necessary to determine the natural frequency of the bridge pier. Therefore, a vibration absorber is attached to each of the upper, middle and lower piers to obtain data for each vibration absorber. After that, these need to be analyzed. The upper pier is often equipped with a platform for inspection of bridges, so this scaffold can be used. For mounting the vibration absorber, a vibration absorber is placed on the top surface of the pier. Just do it.
[0004]
However, when mounting a vibration absorber on the middle or lower pier of a pier, it is necessary to fix the vibration absorber so that it does not fall on the pier side wall, which is a vertical surface or an almost vertical inclined surface. In order to detect this vibration, it is necessary to bring the vibration detector of the vibration sensor into close contact with the pier side wall. As a method for fixing such a vibration damper, there are a method using an adhesive (hereinafter referred to as “bonding method”) and a method using an anchor bolt (hereinafter referred to as “anchor bolt method”).
[0005]
In addition, regarding the work method when attaching a vibration absorber to the middle or lower part of the pier, it is possible to climb up from the base side of the pier to reach the installation position, or to perform the installation work, or downward from the top side of the pier. There are methods to get down to the mounting position and perform the mounting work, and these methods include a method using a stepladder or a ladder (hereinafter referred to as a “stepladder method”), a method using a vehicle dedicated to aerial work ( Hereinafter, there is a method using an aerial work platform method), a method using a rope ladder (hereinafter referred to as “the rope ladder method”), a method using a construction scaffold (hereinafter referred to as “the construction scaffold method”), and the like.
[0006]
[Problems to be solved by the invention]
However, the above-described conventional vibration absorber fixing method and vibration absorber mounting work method have the following problems.
[0007]
(1) In the bonding method, it is necessary to clean the bonding area to form a rough surface (small uneven surface) at the bonding position, and the adhesion between the pier side wall surface and the vibration absorber depends on the degree of this cleaning. Variation in strength occurs. Moreover, it is necessary to press an adhesive until it hardens | cures (for example, 3-5 minutes). Furthermore, after the vibration measurement is completed, it is necessary to peel the vibration absorber from the pier side wall surface using a tool such as a bar. As described above, various preliminary operations are necessary before and after vibration measurement, which is complicated.
[0008]
(2) In the anchor bolt method, it is not necessary to clean and clean the place where the vibration absorber is installed, but it is necessary to drill an insertion hole for inserting the anchor bolt. A power tool such as a vibration drill is used for drilling. However, it is necessary to take a reaction force, and a simple work scaffold such as a stepladder or a rope ladder makes the operator unstable and there is a risk of falling. Moreover, when the vibration absorber is removed, it is only necessary to remove the bolts, but the anchor body is left in the pier housing, and the pier is damaged.
[0009]
(3) In the stepladder method, the maximum height that can be climbed by a stepladder or ladder is about 5m, and if you try to climb a stepladder or ladder at a height higher than that, there is a risk of falling. In addition, this method is basically used when the base of the pier is a riverbank, a road or the like. When the base of the pier is running water, it cannot be used if the water depth and flow velocity are larger than a certain level.
[0010]
(4) The aerial work vehicle method cannot be used except in places where work vehicles can enter the pier base.
[0011]
(5) In the rope ladder method, the rope ladder is suspended from the top of the pier and is used as a scaffold. The pier position can be accommodated even in running water, but in work that requires reaction force, such as drilling work when the vibration sensor is fixed with anchor bolts, or removal work that peels the vibration sensor fixed with adhesive. Workers are likely to be unstable and may fall.
[0012]
(6) The erection scaffold method is a method in which a scaffold is erected directly at a position where a vibration absorber is mounted, and a vibration absorber is attached using this. Depending on the location conditions of the pier, either construction from the pier base or suspension from the top of the pier can be selected. However, the cost increases because it takes labor and days to install and remove. The risk of a crash in the installation of a vibration sensor is reduced, but there is a risk of a crash when the scaffolding is erected and removed.
[0013]
The present invention has been made to solve the above-mentioned problems, and the problem to be solved by the present invention is that the vibration absorber is easy to install, safe and inexpensive, and has an influence on the object to be measured. An object is to provide a few vibration sensor mounting devices and vibration measurement methods.
[0014]
[Means for Solving the Problems]
In order to solve the above-described problems, a vibration absorber mounting device according to the present invention is connected to a frame and a vicinity of a coupling point, which is one point on the frame, and vertically to both sides from a frame surface that is a plane in the frame. An object to be measured having a vertical or inclined wall surface to be measured, comprising a suspension support member having a first arm-shaped part and a second arm-shaped part extending in the same length, and a weight disposed on the frame. A vibration sensor for detecting vibration of a measured location on the measured wall surface is mounted at a position of the frame different from the weight, and near the end of the first arm-shaped portion and the second arm-shaped portion. And the vicinity of the end of the frame is suspended by a wire, and the vibration damper is biased toward the measurement site by balancing the moment of force by the weight around the coupling point in the frame surface. Attach the vibration sensor by crimping it to the measurement site. The features.
[0015]
In the above vibration damper mounting device, preferably, the frame connects one end of the first leg-shaped member extending in one direction and one end of the second leg-shaped member extending in the other direction. Accordingly, the frame surface is a plane including the inverted V-shaped portion of the frame, and the weight is opposite to the connection point of the second leg-shaped member. The vibration absorber is mounted near the end of the first leg-shaped member opposite to the coupling point.
[0016]
In the above vibration sensor mounting device, preferably, a first pulley is provided near the end of the first arm-shaped portion, and a second pulley is provided near the end of the second arm-shaped portion. The wire is routed from above through the lower portion of the first pulley to the lower portion of the second pulley and then returned upward.
[0017]
In the above-described vibration damper mounting device, it is preferable that a first joint that is rotatable around a first joint axis perpendicular to the frame surface is provided in the vicinity of the connection point of the frames, and the suspension support is provided. The member is rotatably connected to the first joint.
[0018]
In the above-described vibration sensor mounting device, preferably, the frame is provided with a second joint that can rotate around a second joint axis perpendicular to the frame surface, It is attached to a vibration damper holding member that is rotatably connected to the second joint.
[0019]
In the above-described vibration sensor mounting device, preferably, the second joint is disposed at a position eccentric from the center of gravity of the vibration sensor holding member, and the vibration sensor is in close contact with the measurement site. Configured to assist.
[0020]
Further, in the above-described vibration sensor mounting device, preferably, the vibration sensor holding member is a plate-like member, and the natural frequency of the vibration sensor mounting device is larger than the natural frequency of the object to be measured. The thickness of the plate-like member is set so as to be.
[0021]
In the above-described vibration damper mounting device, preferably, two or more guide wheels that are rotatable around a wheel axis perpendicular to the frame surface are provided on the side of the measurement target portion of the suspension support member. And an auxiliary suspension ring is provided on the frame, and the vicinity of the end portion of the first arm-shaped portion and the vicinity of the end portion of the second arm-shaped portion are caused by the wire when the vibration damper mounting device is raised and lowered. The auxiliary suspension ring is suspended and supported by an auxiliary wire, and the guide wheel is configured to roll on the measured wall surface.
[0022]
Further, in the above-described vibration damper mounting device, preferably, the suspension support member is supported on the frame side of the suspension support member and the suspension support member side of the frame when the vibration damper mounting device is raised or lowered. A restricting means is provided for restricting the member and the frame from moving relative to each other.
[0023]
In addition, the vibration measuring method according to the present invention is connected to the frame and the vicinity of the coupling point, which is one point on the frame, and extends vertically from the frame surface, which is a plane in the frame, to both sides with the same length. A vibration absorber mounting device having a suspension support member having a first arm-shaped portion and a second arm-shaped portion and a weight disposed on the frame, and at a position of the frame different from the weight. A vibration sensor is mounted, and then the object having a wall surface to be measured that is vertical or inclined is suspended by suspending the vicinity of the end of the first arm and the vicinity of the end of the second arm with a wire. The vibration sensor mounting device is supported in the vicinity of the measurement location on the measured wall surface of the measurement object, and then the force moment due to the weight around the coupling point in the frame surface is balanced. The vibration sensor is urged toward the measurement site to The mounting and crimping said to measured point, then, and detects the vibration of the portion to be measured by the sense of exciter.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIG. 1 is a diagram showing a configuration of a vibration damper mounting device according to an embodiment of the present invention, FIG. 1 (A) is a side view, and FIG. 1 (B) is an enlarged side view in the vicinity of a pulley. Show. FIG. 2 is a front view of the vibration damper mounting device shown in FIG. FIG. 3 is a rear view of the vibration damper mounting device shown in FIG.
[0026]
As shown in FIGS. 1 to 3, the vibration damper mounting device 10 basically includes a frame 14, a suspension support member 16, a vibration damper holding member 31, and a weight 26. Yes.
[0027]
The frame 14 has a first leg-like member 11 and a second leg-like member 12. The first leg-like member 11 is a member made of steel or the like and formed in a rod shape or a tubular shape extending in one direction. The second leg-shaped member 12 is a member made of steel or the like and formed in a rod shape or a tubular shape extending in one direction. In the frame 14, one end of the first leg-shaped member 11 and one end of the second leg-shaped member 12 are coupled to each other by coupling members 13a and 13b and coupling bolts 36. As shown in FIG. It is formed in a letter shape.
[0028]
A first joint 15 is provided in the vicinity of the apex (hereinafter referred to as “joining point”) of the apex portion of the V-shaped portion of the frame 14 described above. The first joint 15 has a structure in which a cylindrical first joint member (not shown) is inserted into a circular first joint hole (not shown), or a member having the first joint hole, or The first joint member is rotatable around a first joint axis that is a straight line perpendicular to a plane formed by including the V-shaped portion of the frame 14 (hereinafter referred to as “frame surface”). . The frame 14 is provided with one of the first joint hole or the first joint member described above.
[0029]
The suspension support member 16 is a substantially “T” -shaped member as shown in FIGS. The other end of the first joint hole or the first joint member described above is provided at the lower end of the vertical portion 16 a of the suspension support member 16, and is fitted with one of the first joint hole or the first joint member provided in the frame 14. In other words, one of the two is rotatably connected to the other.
[0030]
Further, a first arm portion 17 and a second arm portion 18 are extended from both sides in the horizontal direction from the upper part of the vertical direction portion 16 a of the suspension support member 16. The extending length of the first arm-shaped portion 17 from the vertical direction portion 16a is set equal to the extending length of the second arm-shaped portion 18 from the vertical direction portion 16a. The extending direction of the first arm 17 and the second arm 18 is perpendicular to the frame surface.
[0031]
With the configuration of the suspension support member 16 as described above, the suspension support member 16 can rotate by a predetermined angle in the clockwise direction or the counterclockwise direction with the first joint 15 as the rotation center in FIG. ing.
[0032]
As shown in FIG. 1B, the first arm-like portion 17 and the second arm-like portion 18 have a structure in which a predetermined gap is provided between two plate members and arranged in parallel. . As shown in FIGS. 2 and 3, a first pulley 19 is provided in the gap near the horizontal end of the first arm-shaped portion 17. Further, as shown in FIGS. 2 and 3, a second pulley 20 is provided in the gap near the horizontal end of the second arm-shaped portion 18.
[0033]
Further, as shown in FIG. 1B, the second pulley 20 is rotatable around the second pulley shaft 20a attached to the second arm-shaped portion 18. The second pulley shaft 20a is parallel to the frame surface. The first pulley 19 has the same configuration as that of the second pulley 20, and can rotate around a first pulley shaft 19a (see FIGS. 2 and 3) attached to the first arm portion 17. ing. The first pulley shaft 19a is also parallel to the frame surface.
[0034]
In this case, the first pulley 19 and the second pulley 20 are arranged at symmetrical positions with respect to the vertical axis of the vertical direction portion 16 a of the suspension support member 16. Therefore, the horizontal distance from the vertical axis of the vertical direction portion 16a of the suspension support member 16 to the center of the first pulley shaft 19a and the vertical axis of the vertical direction portion 16a of the suspension support member 16 to the center of the second pulley shaft 20a. The horizontal distance is set equal.
[0035]
As shown in FIGS. 2 and 3, a first wire entrance / exit 17 a is provided near the horizontal end of the first arm-like portion 17 at a position obliquely above the first pulley 19. The space in the shape portion 17 communicates with the outside. As shown in FIG. 1B and FIGS. 2 and 3, a second wire entrance / exit 18 a is provided in the vicinity of the horizontal end of the second arm-shaped portion 18 at a position obliquely above the second pulley 20. The space in the second arm-shaped portion 18 communicates with the outside.
[0036]
Further, as shown in FIG. 1B, a semi-circular cross-section wire accommodating groove is formed on the outer periphery of the second pulley 20. Although not shown, the first pulley 19 is also provided with a similar wire housing groove.
[0037]
As shown in FIGS. 2 and 3, on the side of the first leg-shaped member 11 of the suspension support member 16 (on the side to be measured), a wheel mounting portion is provided in the vicinity of the horizontal end of the first arm-shaped portion 17. 22 is attached, and a guide wheel 24 is attached to the wheel attachment portion 22. The guide wheel 24 is configured to be rotatable around an axis of a wheel shaft 24a perpendicular to the frame surface. Moreover, as shown in FIGS. 1-3, the wheel attachment part 23 is attached to the 1st leg-shaped member 11 side of the suspension support member 16 near the horizontal end part of the 2nd arm-shaped part 18, and a wheel attachment A guide wheel 25 is attached to the portion 23. The guide wheel 25 is configured to be rotatable around the axis of the wheel shaft 25a perpendicular to the frame surface.
[0038]
A rod-shaped tip member 11a is provided near the lower end of the first leg-shaped member 11 in FIGS. 1 to 3, that is, near the end of the first leg-shaped member 11 opposite to the coupling point of the frame 14. It is connected by a connecting bolt 37. A second joint 30 is provided at the tip of the tip member 11a, that is, at the end of the tip member 11a opposite to the coupling point with the first leg-like member 11.
[0039]
The second joint 30 has a structure in which a cylindrical second joint member (not shown) is inserted into a circular second joint hole (not shown), or a member having a second joint hole, or The second joint member is rotatable around a second joint axis that is a straight line perpendicular to the frame surface. The tip member 11a is provided with one of the second joint hole or the second joint member described above.
[0040]
The vibration damper holding member 31 is a substantially triangular plate-like member as shown in FIGS. One surface of the vibration damper holding member 31 is provided with the other of the second joint hole or the second joint member described above, and is fitted to one of the second joint hole or the second joint member provided in the tip member 11a. , One of the two is rotatably connected to the other. Further, the mounting position of the second joint 30 on the vibration damper holding member 31 is a position biased upward in the figure from the position of the center of gravity of the vibration damper holding member 31. Further, a block-shaped auxiliary weight 33 is attached to the lower side of the vibration damper holding member 31 in the figure.
[0041]
Due to the configuration of the vibration damper holding member 31 as described above, the vibration damper holding member 31 has a predetermined angle in the clockwise or counterclockwise direction around the second joint 30 in FIG. It can be rotated.
[0042]
As shown in FIG. 2, vibration absorbers 32a, 32b, and 32c are attached to the three corner portions of the vibration absorber holding member 31 having a substantially triangular plate shape. The vibration detectors 32a to 32c use the piezoelectric effect (piezoresistive effect) or the like for the vibration (acceleration of displacement) of an object in contact with the tip on the left side of the drawing (hereinafter referred to as “vibration detection end”). It is a sensor that detects the quantity of electricity. Each of the vibration detectors 32a to 32c is connected to a lead wire or the like for transmitting an electric signal obtained by detecting vibration to a measuring device or the like, but the illustration is omitted.
[0043]
A weight 26 is attached to the vicinity of the lower end of the second leg-shaped member 12 in FIGS. 1 to 3, that is, near the end of the second leg-shaped member 12 opposite to the coupling point of the frame 14. ing. The weight 26 is provided with an annular auxiliary suspension ring 27.
[0044]
Further, as shown in FIGS. 1A and 3, the engagement protrusion 34 is attached so as to protrude near the lower end of the vertical direction portion 16 a of the suspension support member 16, that is, near the first joint 15. It has been. Further, locking portions 35 a and 35 b are attached near the upper end of the second leg-shaped member 12 in the drawing, that is, near the first joint 15.
[0045]
In the vibration isolator mounting device 10 described above, the first leg member 11, the tip member 11 a, the vibration detectors 32 a to 32 c, and the vibration damper holder in a direction perpendicular to the major axis of the first leg member 11. The total gravity of the member 31 and the auxiliary weight 33 is F1, the length of the arm of the moment from the center of gravity on the first leg member 11 side to the coupling point of the frame 14 is L1, and the length of the second leg member 12 is F2 is the total gravitational force of the second leg member 12 and the weight 26 in the direction perpendicular to the axis, and the moment from the position of the center of gravity on the second leg member 12 side to the coupling point of the frame 14 is shown. When the length of the arm is L2, the value of the weight 26 is set so that the following expression (1) is established.
F1 × L1 <F2 × L2 ……… ▲ 1 ▼
[0046]
The left side of the above formula (1) is the moment of force on the first leg-shaped member 11 side around the coupling point (or around the first joint axis) in the frame plane, that is, the entire frame 14 in FIG. This is the moment of force that attempts to rotate counterclockwise. Also, the right side of the above formula (1) is the moment of force on the second leg-shaped member 12 side around the coupling point in the frame plane, that is, the entire frame 14 is rotated clockwise in FIG. It is the moment of the force to be tried.
[0047]
Therefore, the above formula (1) is such that the moment of force around the coupling point in the frame surface of the frame 14 of the vibration absorber mounting device 10 rotates in the clockwise direction in FIG. This shows that the value of the weight 26 is set.
[0048]
Next, the operation of the above-described vibration damper mounting device 10 will be described.
First, one end of the wire rope 21 is fixed to an arbitrary location on the inspection scaffold S provided at the top end of the pier P shown in FIGS. 4 (A) and 4 (B). Here, the bridge pier P corresponds to an object to be measured for measuring vibration. In FIG. 4, B indicates a bridge, G indicates the ground, and W indicates a measured wall surface of the pier P.
[0049]
Next, as shown in FIGS. 2 and 3, the other end of the wire rope 21 (hereinafter referred to as “adjustment end”) is inserted into the internal space of the first arm 17 from the first wire inlet / outlet 17a, for example. After passing through the lower part of the first pulley 19 to the lower part of the second pulley 20, wiring is performed so that the second wire entrance / exit 18a is pulled out to the outside upward again.
[0050]
In this way, the wire rope 21 connects the vicinity of the end of the first arm 17 (the lower left end of the first pulley 19) and the vicinity of the end of the second arm 18 (the lower right end of the second pulley 20). Thus, the suspension can be supported stably. Since the first pulley 19 and the second pulley 20 are arranged symmetrically with respect to the vertical axis of the vertical direction portion 16a of the suspension support member 16, the suspension support member 16 is shown in FIGS. As shown, it is suspended and supported in a precise horizontal state without tilting. Further, at this time, since the wire receiving grooves having a semicircular cross section are formed on the outer circumferences of the first pulley 19 and the second pulley 20, the wire rope 21 is not easily detached.
[0051]
Further, when the vibration damper mounting device 10 is supported in a suspended manner as described above, the vertical or inclined measured wall surface W is on the side facing the vibration detection ends of the vibration dampers 32a to 32c ( In FIG. 1A, the entire frame 14 is rotated clockwise in FIG. 1A around the first joint 15 by the balance of the moment of force around the coupling point in the frame plane. Try to rotate. By this force, the vibration damper holding member 31 is urged in a substantially horizontal direction (left direction in FIG. 1B) opposite to the weight 26 side. For this reason, the vibration detection ends of the vibration detectors 32a to 32c are pressure-bonded to the measured portion side of the measured wall surface W. Thereby, the vibration detectors 32a to 32c are attached to the measurement points (see FIGS. 1A and 4A). Due to this action, the vibration detection ends of the vibration detectors 32a to 32c may closely follow each other regardless of whether the measured wall surface W is a vertical surface or an inclined surface.
[0052]
In the vibration damper holding member 31, the second joint 30 is attached to a position that is biased upward in the figure from the position of the center of gravity of the vibration damper holding member 31, and below the vibration damper holding member 31 in the figure. An auxiliary weight 33 is attached. For this reason, the surface direction of the vibration damper holding member 31 is substantially vertical due to the balance of the moment of force around the second joint axis. By this action, the vibration detection ends of the vibration detectors 32a to 32c are assisted to closely follow and closely adhere to the measured wall surface W whether it is a vertical surface or an inclined surface.
[0053]
Moreover, if the adjustment end (for example, the upper right end in FIGS. 2 and 3) of the wire rope 21 is extended or pulled up, the height position of the entire vibration absorber mounting device 10 on the measured wall surface W of the pier P is adjusted. Can do. As a result, the vibration detectors 32a to 32c can be set at a measurement location at a desired height position where vibration measurement is desired (see FIGS. 4A and 4B). At this time, when the height position of the measurement location on the measurement wall surface W of the pier P changes, the inclination angle (see FIG. 4A) and the opening angle of the wire rope 21 from the inspection scaffold S (see FIG. 4B). However, since the wire rope 21 is supported by the first pulley 19 and the second pulley 12 and the suspension support member 16 can rotate around the first joint axis, the angle of the wire rope 21 changes. You can follow without trouble.
[0054]
After the vibration absorbers 32a to 32c are set at the measurement site by the vibration absorber mounting device 10 as described above, for example, the top end surface or the side wall surface of the pier P is hit with a heavy impact member. A vibration is generated by this, and the response at the measurement location is measured by the vibration detectors 32a to 32c.
[0055]
At this time, the above-described vibration damper holding member 31 is set so that its thickness is thicker than a predetermined value. Thereby, the natural frequency of the vibration damper mounting device 10 as a whole has a value of 100 Hz or more. Since the natural frequency of the bridge pier P is about 5 to 20 Hz, the above-described configuration is taken into consideration so that the vibration sensor mounting device 10 does not resonate due to vibration during measurement and inhibit measurement.
[0056]
Next, a method for raising and lowering the above-described vibration damper mounting device 10 on the measured wall W of the pier P will be described with reference to FIG.
[0057]
First, as described above, the suspension support member 16 is suspended and supported by the wire rope 21, and the auxiliary wire rope 28 is attached to and supported by the auxiliary suspension ring 27. At this time, when the auxiliary wire rope 28 is lifted and the second leg-shaped member 12 is lifted upward in FIG. 5 with the first joint axis as the rotation center, the engaging protrusion 34 is fitted between the locking portions 35a and 35b. . Thereby, the second leg-shaped member 12 is temporarily prevented from rotating (mutual movement) about the first joint axis. The engaging protrusion 34 and the locking portions 35a and 35b constitute a restricting means.
[0058]
In this state, the guide wheels 24 and 25 are pressed against the measured wall W by the balance of the moments of force around the coupling point in the frame plane by the weight 26 described above. If the wire rope 21 and the auxiliary wire rope 28 are simultaneously pulled upward in FIG. 5 in this state, the guide wheels 24 and 25 roll on the measured wall surface W, and the vibration damper mounting device 10 as a whole is shown in FIG. Move without getting caught up. Further, when the wire rope 21 and the auxiliary wire rope 28 are simultaneously drawn downward in FIG. 5, the guide wheels 24 and 25 roll on the measured wall W, and the entire vibration damper mounting device 10 is hooked downward in FIG. Move without If it does in this way, it can raise / lower the vibration sensor attachment apparatus 10 whole easily, without rubbing or hooking vibration sensor 32a-32c on the to-be-measured wall surface W. FIG.
[0059]
Therefore, according to the vibration damper mounting device 10 of the present embodiment, the vibration damper mounting device 10 is suspended and supported by the wire rope 21 from the inspection scaffold S at the top end of the pier P, which is the object to be measured. Because it is temporarily fixed in place and vibration measurement is performed using the vibration sensor 32a etc., it is easier to mount the vibration sensor compared to the conventional method, and it does not use ladders or construction scaffolds. The risk of accidents is low, the cost is low, and the measured object is not adversely affected.
[0060]
Further, according to the vibration damper mounting device 10 of the present embodiment, the vibration damper 32a and the like are pressure-bonded to the measured wall surface W by balancing the moments of the forces around the coupling points in the frame plane. This eliminates the need for adhesives, anchor bolts, etc. in the conventional method, and in this respect as well, it is easy to mount the vibration sensor, and there is little risk of a crash accident, etc. because there is no reaction force in the work, and the cost is low. It is inexpensive and does not adversely affect the object to be measured.
[0061]
In addition, this invention is not limited to the said embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.
[0062]
For example, in the above-described embodiment, the frame (for example, 14) includes a first leg-shaped member (for example, 11) and a second leg-shaped member (for example, 12) that extend in one direction and are combined in an inverted V shape. However, the present invention is not limited to this, and a frame having another configuration may be used. Examples include a flat plate between the first leg member and the second leg member, and a triangular plate or fan plate as a whole, and a truss between the first leg member and the second leg member. Or a block-like or box-like member having a frame surface as a symmetrical surface. In short, the frame may have any structure as long as it can hold the vibration sensor and the weight, and can urge the vibration sensor toward the measurement site by balancing the moment of force. It is.
[0063]
Moreover, in the said embodiment, although the example in which the suspension support member (for example, 16) was formed in T shape was demonstrated, this invention is not limited to this, Even if it is a suspension support member of another structure, Good. As an example, the first arm-shaped portion and the second arm-shaped portion having the same length may be directly extended on both sides of the first joint member (not shown) of the first joint (for example, 15).
[0064]
In the above embodiment, an example in which the first pulley (for example, 19) and the second pulley (for example, 20) are provided has been described. However, the present invention is not limited to this example, and these components are provided. It does not have to be. In short, it is only necessary that the vicinity of the end of the first arm-shaped portion (for example, 17) and the vicinity of the end of the second arm-shaped portion (for example, 18) are supported by the wire.
[0065]
Moreover, in the said embodiment, although the example provided with the 1st joint (for example, 15) and the 2nd joint (for example, 30) was demonstrated, this invention is not limited to this example, This component is not provided. May be. For example, even if it is the structure which does not have a 1st joint and cannot rotate a suspension support member, the crimping | compression-bonding effect | action of the vibration damper which is the fundamental effect | action of this invention is realizable. Similarly, even if there is no second joint and the configuration is such that the vibration sensor holding member cannot be rotated, the pressure bonding function of the vibration sensor, which is the basic function of the present invention, can be realized.
[0066]
Moreover, in the said embodiment, although the vibration damper holding member (for example, 31) was demonstrated in the example formed in plate shape, this invention is not limited to this example, Such a structure is not employ | adopted. Also good. The vibration damper holding member may be, for example, a block shape such as a rectangular parallelepiped shape, a box shape, a frame structure, or the like.
[0067]
Moreover, in the said embodiment, although the vibration damper holding member (for example, 31) was eccentrically attached to the 2nd joint (for example, 30), the example provided with the auxiliary weight (for example, 33) was demonstrated, but this invention The configuration is not limited to this example, and such a configuration may not be adopted. As long as the second joint can rotate, the crimping action of the vibration absorber, which is the basic action of the present invention, can be realized without taking the configuration of the above-described eccentricity and auxiliary weight.
[0068]
Moreover, in the said embodiment, although the example which made the thickness of the vibration damper holding member (for example, 31) thicker than predetermined value was demonstrated, this invention is not limited to this example, Such a structure is employ | adopted. It does not have to be. Even if this configuration is not taken, it is possible to realize the crimping action of the vibration absorber, which is the basic action of the present invention.
[0069]
Moreover, in the said embodiment, although the example provided with the guidance wheel (for example, 24, 25), the auxiliary | assistant suspension ring (for example, 27), the engagement protrusion (for example, 34), and the latching | locking part (for example, 35a, 35b) was demonstrated. The present invention is not limited to this example, and these components may not be provided. Moreover, when these are provided, you may provide only a guidance wheel (for example, 24, 25) and an auxiliary | assistant suspension ring (for example, 27). Moreover, the guidance wheel should just have two wheels provided in the symmetrical position of the 1st arm-shaped part and the 2nd arm-shaped part, and the number is not restricted to two but may be 3 or more. . Further, the attachment position of the auxiliary suspension ring (for example, 27) is not limited to the weight (for example, 26), and any position on the second leg-shaped member (for example, 12) or the frame (for example, 14). May be.
[0070]
Moreover, in the said embodiment, the bridge pier (for example, P) was mentioned as a to-be-measured object, and the side surface (for example, W) was mentioned as a to-be-measured wall surface, However, This invention is not limited to this example. For example, the object to be measured may be an abutment or another structure. The measured wall surface may be a vertical surface or an inclined surface.
[0071]
【The invention's effect】
As described above, according to the present invention, the first leg-shaped member and the second leg-shaped member extending in one direction are combined to form an inverted V-shaped frame, and vertically from the frame surface to both sides. A suspension support member having a first arm portion and a second arm portion extending in the same length is connected in the vicinity of the joint point of the frame, and in the vicinity of the end portion of the second leg member on the opposite side of the joint point. A weight sensor is provided, and a vibration sensor for detecting vibration of a wall surface to be measured, which is vertical or inclined, is mounted near the end opposite to the coupling point of the first leg-shaped member. The end of the two arms are suspended and supported by a wire, and the vibration sensor is urged toward the location to be measured and attached by pressure balancing by the balance of the moment of the force around the connection point in the frame plane. As a result, it is easy to mount the vibration sensor, the mounting work is safe, the cost is low, and there is little impact on the measured object. There is an advantage to say.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a vibration damper mounting device according to an embodiment of the present invention, FIG. 1 (A) is a side view, and FIG. 1 (B) is an enlarged side view near a pulley, respectively. Show.
FIG. 2 is a front view of the vibration damper mounting device shown in FIG.
FIG. 3 is a rear view of the vibration damper mounting device shown in FIG. 1;
4 is a diagram for explaining a vibration measuring method using the vibration damper mounting device shown in FIG. 1; FIG.
FIG. 5 is a diagram for explaining a lifting method of the vibration damper mounting device shown in FIG. 1;
[Explanation of symbols]
10 Vibration absorber mounting device
11 First leg-shaped member
11a Tip member
12 Second leg-shaped member
13a, 13b coupling member
14 frames
15 First joint
16 Suspension support member
16a Vertical section
17 First arm
17a First wire doorway
18 Second arm
18a Second wire doorway
19 First pulley
19a First pulley shaft
20 Second pulley
20a Second pulley shaft
20b Wire receiving groove
21 Wire rope
22, 23 Wheel mounting part
24 induction wheel
24a Wheel axle
25 induction wheel
25a Wheel axle
26 weight
27 Auxiliary Suspension Ring
28 Auxiliary wire rope
30 Second joint
31 Vibration absorber holding member
32a, 32b, 32c
33 Auxiliary weight
34 Engagement protrusion
35a, 35b Locking part
36, 37 connecting bolt
B Bridge
G ground
P Pier (measured object)
S Scaffold for inspection
W Wall to be measured

Claims

A first arm-like portion and a second arm-like shape which are connected to the frame and in the vicinity of a coupling point which is one point on the frame and which extend from the frame surface which is a plane in the frame vertically to the both sides with the same length A suspension support member having a portion, and a weight disposed on the frame,
A vibration sensor for detecting vibration of a measurement location on the measurement wall surface of a measurement object having a vertical or inclined measurement wall surface is attached to the position of the frame different from the weight, and the first arm shape And the vicinity of the end of the second arm-like portion is suspended and supported by a wire, and the feeling is obtained by balancing the moment of force by the weight around the coupling point in the frame plane. A vibration sensor mounting apparatus, wherein the vibration sensor is urged toward the measurement site and the vibration sensor is attached to the measurement site by pressure bonding.

In the vibration damper mounting device according to claim 1,
The frame is configured in an inverted V shape by joining one end of a first leg-shaped member extending in one direction and one end of a second leg-shaped member extending in the other direction.
The frame surface is a plane including the inverted V-shaped portion of the frame;
The weight is disposed in the vicinity of the end of the second leg-shaped member opposite to the coupling point;
The vibration damper is attached near the end of the first leg-shaped member opposite to the coupling point.

In the vibration damper mounting device according to claim 1,
A first pulley is provided near the end of the first arm-shaped portion,
A second pulley is provided near the end of the second arm-shaped portion,
The vibration sensor mounting device according to claim 1, wherein the wire is wired so as to be returned upward after being passed from above to the lower portion of the second pulley through the lower portion of the first pulley.

In the vibration damper mounting device according to claim 1,
A first joint capable of rotating around a first joint axis perpendicular to the frame surface is provided near the connection point of the frame,
The suspension mounting device is characterized in that the suspension support member is rotatably connected to the first joint.

In the vibration damper mounting device according to claim 1,
The frame is provided with a second joint rotatable around a second joint axis perpendicular to the frame surface;
The vibration damper is attached to a vibration damper holding member that is rotatably connected to the second joint.

In the vibration damper mounting device according to claim 5,
The second joint is disposed at a position deviated from the center of gravity of the vibration damper holding member, and is configured to assist the vibration damper in close contact with the measurement site. Device mounting device.

In the vibration damper mounting device according to claim 5,
The vibration damper holding member is a plate-like member, and the thickness of the plate-like member is set so that the natural frequency of the vibration damper mounting device is larger than the natural frequency of the object to be measured. A vibration absorber mounting device characterized by the above.

In the vibration damper mounting device according to claim 1,
Two or more guide wheels that can rotate around a wheel axis perpendicular to the frame surface are provided on the measurement target side of the suspension support member,
The frame is provided with an auxiliary hanging ring,
At the time of raising and lowering the vibration sensor mounting device, the end portion of the first arm portion and the end portion of the second arm portion are suspended and supported by the wire, and the auxiliary suspension ring is supported by the auxiliary wire. The vibration damper mounting device, wherein the guide wheel is configured to roll on the wall surface to be measured.

In the vibration damper mounting device according to claim 8,
On the frame support side of the suspension support member and on the suspension support member side of the frame, there is a restricting means for restricting the suspension support member and the frame from moving relative to each other when the vibration damper mounting device is raised and lowered. A vibration absorber mounting device characterized by being provided.

A first arm-like portion and a second arm-like shape which are connected to the frame and in the vicinity of a coupling point which is one point on the frame and which extend from the frame surface which is a plane in the frame vertically to the both sides with the same length Using a vibration absorber mounting device having a suspension support member having a portion and a weight disposed on the frame,
Attach a vibration sensor at the position of the frame different from the weight,
Next, the measured wall surface of the measured object having a measured wall surface that is vertical or inclined by suspending the vicinity of the end portion of the first arm-shaped portion and the vicinity of the end portion of the second arm-shaped portion with a wire. Support the vibration absorber mounting device in the vicinity of the location to be measured above,
Next, the vibration sensor is urged toward the measurement site by the balance of the moment of force by the weight around the coupling point in the frame plane, and the vibration sensor is pressed against the measurement site. Mounting,
Next, a vibration measuring method, wherein the vibration of the measurement site is detected by the vibration sensor.