JP3603765B2

JP3603765B2 - Vibration control rack

Info

Publication number: JP3603765B2
Application number: JP2000264931A
Authority: JP
Inventors: 修福田; 潤一増田; 太郎稲垣; 朋也小久保
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2000-01-05
Filing date: 2000-09-01
Publication date: 2004-12-22
Anticipated expiration: 2020-09-01
Also published as: JP2001253518A; US20010005961A1

Description

【０００１】
【発明の利用分野】
この発明は自動倉庫等に用いる制震ラックに関する。
【０００２】
【従来技術】
自動倉庫等に用いるラックには耐震性が要求され、特に高層になるほど、耐震性への要求は厳しくなる。そして必要な耐震性にあわせて柱等の剛性を高めると、柱の太さが著しく増す結果になる。
【０００３】
【発明の課題】
この発明の課題は、比較的大きな地震時の振動エネルギーをジョイントで吸収することにより、制震性を持たせて耐震性を向上させると共に、上部ジョイントと下部ジョイント間の接続部の接続部の塑性変形を確実に防止し、さらに比較的小さな地震時にはジョイントの変形部が変形しないようにすることにある（請求項１〜５）。
請求項２，４，５の発明での追加の課題は、ジョイントの変形部のみが変形するようにするための具体的な構成を提供することにある。
請求項３の発明での追加の課題は、自動倉庫のラックとして適した制震ラックを提供することにある。
【０００４】
【発明の構成】
この発明は、上部ジョイントと下部ジョイントとからなるジョイントで、上下の柱部材を接続した柱を有する制震ラックであって、上部ジョイントと下部ジョイントの少なくとも一方に、上側の柱部材の上方移動を塑性変形により許容する変形部を設けると共に、変形部の外側に上部ジョイントと下部ジョイントとを接続しかつ変形部よりも強度の高い接続部を設け、さらに上部ジョイントと下部ジョイントの各々にフランジ部を設けて、上下の柱部材を前記フランジ部で支持しながら上部ジョイントと下部ジョイントとを重ね合わせ、かつ前記変形部を前記フランジ部と前記接続部との間に設けたことを特徴とする。
【０００５】
好ましくは、変形部を接続部よりも肉薄もしくは幅狭とする（請求項２）。
また好ましくは、制震ラックは桁行方向の長さに比べてスパン方向の幅が狭く、前記ジョイントの変形部の塑性変形で、スパン方向の水平応力による振動を制震する（請求項３）。
【０００６】
好ましくは、前記変形部に溝または穴を設けて、変形部の強度を接続部に比べて相対的に低くする。
また好ましくは、前記接続部にリブを設けて補強する。
【０００７】
【発明の作用と効果】
この発明では、地震時等に上部の柱部材に引き抜き応力（上方への引っ張り張力）が加わると、変形部が塑性変形して、上部の柱部材の上方への移動を許容する。これに伴って振動エネルギーが吸収されて制震する。また上部ジョイントと下部ジョイントの接続部は、変形部の外側に設けられ、かつ変形部よりも高い強度で構成されているので、変形部が変形しても接続部は変形せず、ジョイントでの上下の柱部材の接続が外れることがない。これらのために、柱自体の太さや肉厚などを増す以外の構成で、ラックの耐震性を向上させることができる（請求項１〜３）。ジョイントの塑性変形による耐震作用は、ラックの耐用年数の間に１回以下しか生じないような激しい地震等を対象とし、耐用年数の間に複数回経験するような地震では、変形部が変形しないようにするのが好ましい。このようにすれば、ラックの自重等を増さずに、極めて希な地震などに対しても柱部材の座屈を防止し、ラックの倒壊を防止することができる。
【０００８】
請求項２の発明では、変形部を接続部よりも肉薄にし、あるいは幅狭にすることにより構成する。このため変形部と接続部とに確実に強度の差を設けることができ、変形部のみが塑性変形して、接続部は変形しない。
請求項３の発明では、自動倉庫のラックに適した制震ラックを提供する。自動倉庫のラックは高層かつ軽量であることが要求され、桁行方向の長さに比べてスパン方向の幅が狭いので、制震ジョイントによりスパン方向の水平応力への耐久性を増し、激しい地震等への耐久性を増すことができる。
【０００９】
変形部の強度を接続部の強度より相対的に低くするための構成は様々なものがあり、例えば変形部に溝や穴を設けても良い（請求項４）。また接続部にリブを設けて補強しても良い（請求項５）。
【００１０】
【実施例】
図１〜図６に、実施例の制震ラックを示す。図１の制震ラック２において、４はスパン方向の中央部の柱で複数本設け，６はスパン方向両端の柱で同様に両端にそれぞれ複数本設け、制震ジョイントは少なくともスパン方向両端の柱６に設ける。柱６は上下方向に複数本の柱部材、例えば角鋼管、をジョイントで接続したもので、その内少なくとも１つのジョイントを制震ジョイントとする。８，１０は桁材で、この内、桁材８は桁行方向の桁材で、桁材１０はスパン方向の桁材で、桁行方向、スパン方向は、図１に従って定義する。１２，１４は斜材である。ラック２はトラス構造である。１６，１６は制震ラック２の桁行方向両側に敷設したレールで、スタッカークレーン等の搬送装置を走行させるためのものである。
【００１１】
図２に、制震ラック２を用いた自動倉庫１７を示す。３，３は制震ラック２と同様の制震ラックで、ラック３のスパン方向の幅はラック２の場合の半分で、中央部の柱４が無く、他の点では、スパン方向両側の柱６に制震ジョイントを設けることを含め、制震ラック２と同様である。なおラック３，３で外壁を支持する場合には、風圧などによって変形するのを防止するため、ラック３，３には制震ジョイントを設けなくても良い。１８はスタッカークレーン等の搬送装置である。制震ラック３と制震ラック２のスパン方向の半分で、自動倉庫のユニットを構成し、これをスパン方向に沿って連接して、自動倉庫１７とする。自動倉庫１７の場合、ラック２，３の高さを例えば３０ｍ以上とし、スパン長に比べて桁行長が極端に長いため、桁行方向には剛性が高いが、スパン方向では水平応力に弱い特性を有している。そしてラック２，３の高さを例えば３０ｍ以上と高くできるように、柱６の肉厚等を増さずに、スパン方向の強度を増すことが実施例での目的である。
【００１２】
図３，図４に、制震ジョイント２１を示す。制震ジョイント２１は、上部ジョイント２０ａと下部ジョイント２０ｂとからなり、上下のジョイント２０ａ，ｂはほぼ同形状で、背中合わせに重ね合わせられて、角鋼管状の柱部材６ａ，６ｂを接続する。２２はジョイント２１のフランジ部で、例えば四角形状をし、フランジ部２２に柱部材６ａ，６ｂを溶接などで結合する。ただし、フランジ部２２への柱部材６ａ，６ｂの結合やその補強方法は任意である。また上下のジョイント２０ａ，２０ｂで、フランジ部２２，２２は重ね合わせてあるだけで、相互に結合していない。２４は激しい振動に対して塑性変形して振動エネルギーを吸収するための変形部で、フランジ部２２の外側に設け、２６は変形部２４の外側の接続部で、ボルト２８とナット３０、溶接などの適宜の固着手段で、上下のジョイント２０ａ，ｂを接続する。ジョイント２０ａ，２０ｂは極軟鋼などの塑性変形しやすい金属を用い、変形部２０はフランジ部２２や接続部２６よりも幅狭にし、あるいは接続部２６よりも肉薄にして、引っ張り張力に対して、変形部２４のみを塑性変形させる。実施例では、変形部２４を肉薄かつ幅狭にしたが、いずれかのみでも良い。接続部２６は、極軟鋼などのジョイント２１の地金上に、普通鋼などのより固い金属板からなる座金を例えば溶接などで重ね、塑性変形しにくくしてある。
【００１３】
図５に、地震などによる変形部２４の変形を示す。図５の右側が地震等の経験前の状態で、ここから変形部２４の降伏点を超えた引き抜き応力（引っ張り張力）が加わると、変形部２４が塑性変形して、上部の柱部材６ａが下部の柱部材６ｂに対して上方へ相対移動する。このため上下のジョイント２０ａ，２０ｂ間に隙間が開いた状態となる。地震等の場合、ラック２の振動の位相が１８０度変化すると、引き抜き応力の次に上方から下方への圧縮応力が加わり、この力で変形部２４は隙間を塞ぐように変形し、図５の右側の状態に近づく。これらの間に、変形部２４の塑性変形等で地震等のエネルギーが吸収され、制震が行われる。
【００１４】
図６は、制震ジョイント２１による制震ラック２の倒壊防止のメカニズムを示す。制震ラック２は桁行方向には長いので、この方向の地震波には元々強度が高い。スパン方向には背が高くて幅狭なので強度が低く、図６の白抜き矢印のように水平応力が加わると、図６の右側で柱部材６ａ，６ｂ間の接続部Ｐ点に圧縮応力が加わり、左側の接続部Ｑ点には引っ張り張力が加わる。この張力に対して、ジョイント２１の変形部２４が上下方向に隙間が開くように塑性変形する。振動の位相が１８０度変わると、Ｐ点側のジョイントで変形部２４が塑性変形する。これらの間に振動エネルギーを吸収する。これらのため、自動倉庫１７のラック２，３のスパン方向の耐震性を高め、ラック２，３の高層化を柱部材６ａ，６ｂ等の太さを増すこと以外の手法で行うことができる。またラック２はジョイント２１の補修や交換などで、ジョイント２１の塑性変形後に修理できる。
【００１５】
実施例では、上下のジョイント２０ａ，ｂにそれぞれ変形部２４を設けたが、一方のジョイントにのみ設けても良い。またジョイント２１の材質は極軟鋼以外のものも用い得る。実施例ではラック２，３の高層化と耐震性を例に説明したが、高さを増さずに耐震性を増す場合にも用いることができる。
【００１６】
【変形例】
図７〜図１２に変形例を示す。図７，図８の変形例では、制震ジョイント４０の中央部に、柱部材を溶接するためのフランジ面４２を設け、その左右両側に変形部４４を設け、変形部４４の両外側の制震ジョイント４０の両端を接続部４６とする。制震ジョイント４０の材質には、降伏点が管理されたＳＮ鋼や、降伏点が低く塑性変形しやすい極軟鋼などを用いる。４８はボルト穴で、制震ジョイント４０は図８のように上下に重ね合わせて配置し、ボルト２８とナット３０とで互いに結合する。図７，図８の変形例では、変形部４４は溝で形成され、板状の部材から溝４４を削り、ボルト穴４８を設けて制震ジョイント４０としてある。ここでは溝４４は、図７の上下方向に沿って制震ジョイント４０の全幅分の長さの溝としたが、制震ジョイント４０を横断しない溝でも良い。また図８に示すように、溝４４は断面をほぼ長方形状としたが、半円状等の溝でも良い。即ち、変形部４４に溝を設けることにより、その部分で制震ジョイントの合計の肉厚を接続部より小さくすればよい。
【００１７】
図９，図１０に、穴を用いた２つの変形例を示す。図９の制震ジョイント５０では、フランジ面４２の左右両側の変形部５４に穴５５を設け、制震ジョイント５０の両端には接続部５６を設けて、ボルト穴４８を設ける。穴５５をここでは貫通穴とするが、底のある穴でもよい。また穴の形状は、図９のような楕円形に限らず、円形や四角形等でも良い。
【００１８】
図１０は穴６５を用いた制震ジョイント６０を示し、中央のフランジ面４２の両側に変形部６４を設け、半円状の穴（切れ込み）６５を変形部６４に設ける。変形部６４の両外側には接続部６６があり、同様にボルト穴４８が設けてある。穴６５は半円状の切れ込みからなる穴としたが、長方形状や正方形状の切れ込みから成る穴でも良い。
【００１９】
図１１，図１２に、リブを用いた変形例を示す。図１１の制震ジョイント７０では、フランジ面４２の両側に変形部７４を設け、その両外側の接続部７６の例えば各３カ所にリブ７７を設ける。４８は前記のボルト穴で、リブ７７を除くと、制震ジョイント７０は表面が板状である。そして接続部７６にリブ７７を設けることにより、接続部の変形を防止し、変形部７４で変形するようにしてある。なお接続部７６と変形部７４の強度の差をより大きくするには、図１１に鎖線で示したように変形部７４に切れ込みや穴、溝などを設ければよい。
【００２０】
図１２の変形例では、フランジ面４２の部分の変形を防止すると共に、接続部８６の変形も防止する。８３，８３はフランジ面４２を補強するためのリブで、柱部材とのボルト止め等に兼用しても良い。８４はフランジ面４２の両側の変形部で、８６は接続部で、図１２の上下方向に貫通するリブ８７を設けて、変形部８４よりも肉厚にしてある。リブ８７の構造を図１２の右下隅に拡大して示す。
【００２１】
図１３，１４に第６の変形例の制震ジョイント９０を示す。９１は上部ジョイント、９２は下部ジョイントで、これらを厚板からなる接続部９４に例えば溶接で固着する。９６は変形部で、変形部９６の内側には取り付け板９８を設けて、柱部材側の取り付け板９９に例えばボルト止めする。制震ジョイント９０が大きな引き抜き力を経験すると、図１４のように変形する。
【００２２】
図１５に、上下の制震ジョイント間にライナー１００を介在させた変形例を示す。この変形例では、図３の制震ジョイント２１での上部ジョイント２０ａと下部ジョイント２０ｂの間に、ライナー１００を介在させる例を示すが、図７〜図１４の制震ジョイントにも同様に適用できる。図１５では各部材を平面視で示し、上から上部ジョイント２０ａの上面，ライナー１００、下部ジョイント２０ｂの裏面を示している。ライナー１００は板状部材で、例えば普通鋼製である。ライナー１００は図１５の上下で非対称な形状をしており、図１５でのライナー１００の上側がラックの外側に、下側がラックの内側に位置するように用いる。
【００２３】
ライナー１００には、カット部１０２と、変形部対応部１０４と、ボルト穴１０６とを設け、ボルト穴１０６は制震ジョイントのボルト穴４８と連通するように設けてある。カット部１０２は、制震ジョイントのフランジ部に対応する位置で、ラックの外側を向いた大きな切り欠きからなる。変形部対応部１０４は、制震ジョイント２１の変形部２４の形状に合わせた切り欠きで、制震ジョイント側で、変形部に切り欠きを設けず肉厚を薄くする場合等は、変形部対応部１０４は不要である。
【００２４】
図１のラック２で、地震等により水平力が加わると、一方の柱には圧縮力が、他方の柱には引き抜き力が加わり、引き抜き力により制震ジョイントの変形部２４が変形して、上側の柱部材が上方へ移動する。この時、圧縮力が加わった側の柱では、上側の柱部材がラックの外側へ僅かに回動すれば、水平力をより効果的に逃がすことができる。ここでジョイント２０ａ，ｂ間にライナー１００を設け、カット部１０２がラックの外側を向いていると、上側の柱部材がラックの外側へ回動するのが容易になる。このためラックの、水平力への耐久性がさらに向上する。
【００２５】
なおライナー１００は、上下の制震ジョイント間に設ける板状の部材で、両端付近に上下の制震ジョイントとの取り付け部を設け、その間のライナー中央部を、上側の柱部材のラックの外側への回動を内側への回動よりも容易にするように構成した部材であれば良い。例えば、カット部１０２を設ける代わりに、カット部１０２の部分を肉薄にしても良い。
【図面の簡単な説明】
【図１】実施例の制震ラックの要部斜視図
【図２】実施例の制震ラックを用いた自動倉庫の平面図
【図３】実施例で用いた制震ジョイントの平面図
【図４】実施例の制震ジョイントの側面図
【図５】実施例での制震ジョイントの塑性変形による振動の吸収を示す図で、左側が塑性変形後の状態を、右側が塑性変形前の状態を示す
【図６】実施例で、制震ラックのスパン方向に加わる地震力と制震ジョイントによる振動の吸収を示す図
【図７】変形例の制震ジョイントの平面図
【図８】変形例の制震ジョイントの側面図
【図９】第２の変形例の制震ジョイントの平面図
【図１０】第３の変形例の制震ジョイントの平面図
【図１１】第４の変形例の制震ジョイントの平面図
【図１２】第５の変形例の制震ジョイントの平面図
【図１３】第６の変形例の制震ジョイントの側面図
【図１４】第６の変形例での制震ジョイントの変形を示す側面図
【図１５】制震ジョイントの間にライナーを介在させた変形例での、上側の制震ジョイントとライナーと下側の制震ジョイントとの関係を示す図
【符号の説明】
２，３制震ラック
４，６柱
６ａ，ｂ柱部材
８，１０桁材
１２，１４斜材
１６レール
１８搬送装置
２０ａ上部ジョイント
２０ｂ下部ジョイント
２１制震ジョイント
２２フランジ部
２４変形部
２６接続部
２８ボルト
３０ナット
４０，５０，６０制震ジョイント
４２フランジ面
４４，５４，６４変形部
４６，５６，６６接続部
４８ボルト穴
５５，６５穴
６５溝
７０，８０制震ジョイント
７４，８４変形部
７６，８６接続部
７７，８３，８７リブ
９０制震ジョイント
９１上部ジョイント
９２下部ジョイント
９４接続部
９６変形部
９８，９９取り付け板
１００ライナー
１０２カット部
１０４変形部対応部
１０６ボルト穴[0001]
Field of application of the invention
The present invention relates to a vibration control rack used for an automatic warehouse or the like.
[0002]
[Prior art]
Racks used for automatic warehouses and the like are required to have earthquake resistance, and the requirements for the earthquake resistance become strict, particularly as the height of the rack increases. When the rigidity of the column or the like is increased in accordance with the required earthquake resistance, the thickness of the column is significantly increased.
[0003]
[Problems of the Invention]
An object of the present invention is to improve vibration resistance by imparting vibration damping properties by absorbing vibration energy at the time of a relatively large earthquake with a joint, and to improve plasticity of a connection part of a connection part between an upper joint and a lower joint. An object of the present invention is to surely prevent deformation and prevent a deformed portion of a joint from deforming during a relatively small earthquake.
An additional object of the present invention is to provide a specific configuration for deforming only the deformed portion of the joint.
An additional object of the present invention is to provide a vibration control rack suitable as a rack for an automatic warehouse.
[0004]
Configuration of the Invention
The present invention is a vibration damping rack having a column connecting upper and lower column members with a joint including an upper joint and a lower joint, wherein at least one of the upper joint and the lower joint moves the upper column member upward. provided with a deformable portion that allows by plastic deformation, on the outside of the deformable portion connecting the upper joint and a lower joint and set high connection portion strength than deformable portions only, further flange on each of the upper joints and the lower joints The upper joint and the lower joint are overlapped while supporting the upper and lower column members by the flange portion, and the deformed portion is provided between the flange portion and the connection portion .
[0005]
Preferably, the deformed portion is thinner or narrower than the connecting portion (claim 2).
Preferably, the vibration damping rack has a narrower width in the span direction than the length in the girder direction, and vibrates due to horizontal stress in the span direction due to plastic deformation of the deformed portion of the joint.
[0006]
Preferably , a groove or a hole is provided in the deformed portion to make the strength of the deformed portion relatively lower than that of the connection portion.
Preferably , a rib is provided at the connecting portion to reinforce the connecting portion .
[0007]
Function and Effect of the Invention
According to the present invention, when a pull-out stress (upward tensile force) is applied to the upper column member during an earthquake or the like, the deformed portion is plastically deformed, and the upper column member is allowed to move upward. Along with this, vibration energy is absorbed and vibration is damped. Also, the connection between the upper joint and the lower joint is provided outside the deformed part and is configured with higher strength than the deformed part, so even if the deformed part is deformed, the connection part does not deform, There is no disconnection between the upper and lower pillar members. For these reasons, the seismic resistance of the rack can be improved with a configuration other than increasing the thickness or thickness of the pillar itself (claims 1 to 3). The seismic action due to plastic deformation of the joint is intended for severe earthquakes that occur only once or less during the useful life of the rack, and the deformed part does not deform in an earthquake that is experienced multiple times during the useful life of the rack It is preferable to do so. In this way, it is possible to prevent the column members from buckling and prevent the rack from collapsing even in an extremely rare earthquake without increasing the weight of the rack.
[0008]
According to the second aspect of the present invention, the deformed portion is configured to be thinner or narrower than the connecting portion. Therefore, a difference in strength can be reliably provided between the deformed portion and the connection portion, and only the deformed portion is plastically deformed, and the connection portion is not deformed.
According to the third aspect of the present invention, there is provided a vibration control rack suitable for a rack of an automatic warehouse. Automated warehouse racks are required to be high-rise and lightweight, and have a narrow width in the span direction compared to the length in the girder direction. Durability can be increased.
[0009]
There are various configurations for making the strength of the deformed portion relatively lower than the strength of the connection portion. For example, a groove or a hole may be provided in the deformed portion. Further, the connection portion may be provided with a rib for reinforcement.
[0010]
【Example】
1 to 6 show a vibration control rack according to an embodiment. In the damping rack 2 of FIG. 1, 4 is a plurality of pillars at the center in the span direction, 6 is pillars at both ends in the span direction, and a plurality of pillars are similarly provided at both ends. 6. The column 6 is formed by connecting a plurality of column members, for example, square steel pipes, in a vertical direction with a joint, and at least one joint is a vibration control joint. 8, 10 are girder members, of which girder member 8 is a girder member in the girder direction, girder member 10 is a girder member in the span direction, and the girder direction and span direction are defined according to FIG. Reference numerals 12 and 14 denote oblique members. The rack 2 has a truss structure. Reference numerals 16 and 16 denote rails laid on both sides of the damping rack 2 in the girder direction, for running a transport device such as a stacker crane.
[0011]
FIG. 2 shows an automatic warehouse 17 using the vibration control rack 2. 3 and 3 are vibration control racks similar to the vibration control rack 2. The width of the rack 3 in the span direction is half of that of the rack 2, and there is no pillar 4 at the center. 6 is the same as the vibration control rack 2 including the provision of the vibration control joint. When the outer walls are supported by the racks 3, 3, the racks 3, 3 do not need to be provided with vibration damping joints to prevent deformation due to wind pressure or the like. Reference numeral 18 denotes a transfer device such as a stacker crane. An automatic warehouse unit is constituted by the half of the vibration control rack 3 and the vibration control rack 2 in the span direction, and is connected along the span direction to form the automatic warehouse 17. In the case of the automatic warehouse 17, since the height of the racks 2 and 3 is set to, for example, 30 m or more and the girder line length is extremely longer than the span length, the rigidity is high in the girder direction but weak in horizontal stress in the span direction. Have. An object of the embodiment is to increase the strength in the span direction without increasing the thickness of the pillar 6 so that the height of the racks 2 and 3 can be increased to, for example, 30 m or more.
[0012]
3 and 4 show the vibration damping joint 21. FIG. The vibration damping joint 21 is composed of an upper joint 20a and a lower joint 20b, and the upper and lower joints 20a, b have substantially the same shape and are overlapped back to back to connect the square steel tubular column members 6a, 6b. Reference numeral 22 denotes a flange portion of the joint 21, which has a rectangular shape, for example, and to which the column members 6a and 6b are connected by welding or the like. However, the method of connecting the column members 6a and 6b to the flange portion 22 and the method of reinforcing the column members are optional. In the upper and lower joints 20a, 20b, the flange portions 22, 22 are merely overlapped, but are not connected to each other. Reference numeral 24 denotes a deforming portion for plastically deforming against severe vibration to absorb vibration energy, and is provided outside the flange portion 22, and 26 is a connecting portion outside the deforming portion 24, such as a bolt 28 and a nut 30, welding, and the like. The upper and lower joints 20a and 20b are connected by an appropriate fixing means. The joints 20a and 20b are made of a metal which is easily plastically deformed, such as extremely mild steel, and the deformed portion 20 is made narrower than the flange portion 22 or the connecting portion 26, or thinner than the connecting portion 26, so that the joint 20a and 20b have a smaller tensile strength. Only the deformed portion 24 is plastically deformed. In the embodiment, the deformed portion 24 is thin and narrow, but may be any one. The connecting portion 26 is made of a hard metal plate made of a harder metal, such as ordinary steel, for example, which is overlaid on a base metal of the joint 21 made of extremely mild steel, for example, by welding or the like, so that plastic deformation is less likely to occur.
[0013]
FIG. 5 shows the deformation of the deformation part 24 due to an earthquake or the like. The right side of FIG. 5 is a state before the experience of an earthquake or the like, and when a pulling stress (tensile tension) exceeding the yield point of the deformed portion 24 is applied thereto, the deformed portion 24 is plastically deformed, and the upper column member 6a is deformed. It moves upward relative to the lower column member 6b. Therefore, a gap is opened between the upper and lower joints 20a and 20b. In the case of an earthquake or the like, when the phase of the vibration of the rack 2 changes by 180 degrees, a compressive stress is applied from the upper side to the lower side after the pullout stress, and the deformed portion 24 is deformed by this force so as to close the gap. Approach the state on the right. During this time, energy such as an earthquake is absorbed by the plastic deformation of the deformed portion 24 and the like, and the vibration is damped.
[0014]
FIG. 6 shows a mechanism for preventing the vibration control rack 2 from collapsing by the vibration control joint 21. Since the vibration control rack 2 is long in the girder direction, the strength of the seismic wave in this direction is originally high. In the span direction, the strength is low because it is taller and narrower, and when a horizontal stress is applied as shown by a white arrow in FIG. 6, a compressive stress is applied to a connection point P between the column members 6a and 6b on the right side in FIG. In addition, a tensile force is applied to the left connection point Q. In response to this tension, the deformed portion 24 of the joint 21 plastically deforms so as to open a gap in the vertical direction. When the phase of the vibration changes by 180 degrees, the deformable portion 24 plastically deforms at the joint on the point P side. Absorb the vibration energy between them. For this reason, the seismic resistance of the racks 2 and 3 in the automatic warehouse 17 in the span direction can be improved, and the racks 2 and 3 can be raised in height by a method other than increasing the thickness of the column members 6a and 6b. The rack 2 can be repaired after plastic deformation of the joint 21 by repairing or replacing the joint 21.
[0015]
In the embodiment, the deformable portions 24 are provided on the upper and lower joints 20a and 20b, respectively, but may be provided on only one joint. Further, the material of the joint 21 may be other than very soft steel. In the embodiment, the racks 2 and 3 are described as an example in which the height is increased and the earthquake resistance is used. However, the present invention can also be used when the earthquake resistance is increased without increasing the height.
[0016]
[Modification]
7 to 12 show modified examples. In the modified examples of FIGS. 7 and 8, a flange surface 42 for welding a column member is provided at the center of a vibration damping joint 40, and deformed portions 44 are provided on both left and right sides thereof. Both ends of the vibration joint 40 are referred to as connection portions 46. As the material of the vibration damping joint 40, SN steel in which the yield point is controlled, ultra-soft steel having a low yield point and being easily plastically deformed, or the like is used. Numeral 48 is a bolt hole, and the vibration damping joint 40 is disposed vertically one above the other as shown in FIG. In the modified examples of FIGS. 7 and 8, the deformed portion 44 is formed by a groove, and the groove 44 is cut from a plate-like member, and a bolt hole 48 is provided to form the vibration damping joint 40. Here, the groove 44 has a length corresponding to the entire width of the vibration damping joint 40 along the vertical direction in FIG. 7, but may be a groove that does not cross the vibration damping joint 40. As shown in FIG. 8, the groove 44 has a substantially rectangular cross section, but may be a semicircular groove or the like. That is, by providing a groove in the deformed portion 44, the total thickness of the vibration damping joint at that portion may be made smaller than that of the connection portion.
[0017]
9 and 10 show two modified examples using holes. In the vibration damping joint 50 of FIG. 9, holes 55 are provided in the deformed portions 54 on both right and left sides of the flange surface 42, connection portions 56 are provided at both ends of the vibration damping joint 50, and bolt holes 48 are provided. The hole 55 is a through hole here, but may be a hole with a bottom. Further, the shape of the hole is not limited to the elliptical shape as shown in FIG. 9, but may be a circular shape or a square shape.
[0018]
FIG. 10 shows a vibration damping joint 60 using a hole 65. A deformed portion 64 is provided on both sides of the central flange surface 42, and a semicircular hole (cut) 65 is provided in the deformed portion 64. On both outer sides of the deformed portion 64, there are connection portions 66, and similarly, bolt holes 48 are provided. The hole 65 is formed as a semi-circular cut, but may be formed as a rectangular or square cut.
[0019]
11 and 12 show modified examples using ribs. In the vibration damping joint 70 of FIG. 11, deformed portions 74 are provided on both sides of the flange surface 42, and ribs 77 are provided at, for example, three places on each of the connection portions 76 on both outer sides. Reference numeral 48 denotes the bolt hole, and the surface of the vibration damping joint 70 is plate-shaped except for the rib 77. By providing a rib 77 on the connecting portion 76, deformation of the connecting portion is prevented, and the connecting portion 76 is deformed by the deforming portion 74. In order to further increase the difference in strength between the connecting portion 76 and the deformed portion 74, a cut, a hole, a groove, or the like may be provided in the deformed portion 74 as shown by a chain line in FIG.
[0020]
In the modification shown in FIG. 12, the deformation of the flange surface 42 and the deformation of the connecting portion 86 are also prevented. Reference numerals 83, 83 denote ribs for reinforcing the flange surface 42, which may also be used for bolting to the column member or the like. Reference numeral 84 denotes a deformed portion on both sides of the flange surface 42, and reference numeral 86 denotes a connecting portion, which is provided with a rib 87 penetrating in the vertical direction in FIG. The structure of the rib 87 is shown enlarged in the lower right corner of FIG.
[0021]
13 and 14 show a vibration damping joint 90 according to a sixth modification. Reference numeral 91 denotes an upper joint, and 92 denotes a lower joint, which are fixed to a connecting portion 94 made of a thick plate by, for example, welding. Reference numeral 96 denotes a deformed portion. A mounting plate 98 is provided inside the deformed portion 96 and is bolted to the mounting plate 99 on the column member side, for example. When the damping joint 90 experiences a large pull-out force, it deforms as shown in FIG.
[0022]
FIG. 15 shows a modification in which the liner 100 is interposed between the upper and lower vibration damping joints. In this modified example, an example is shown in which the liner 100 is interposed between the upper joint 20a and the lower joint 20b in the vibration damping joint 21 of FIG. 3, but the same can be applied to the vibration damping joints of FIGS. . In FIG. 15, each member is shown in a plan view, and the upper surface of the upper joint 20a, the back surface of the liner 100, and the lower surface of the lower joint 20b are shown from above. The liner 100 is a plate-like member, for example, is made of ordinary steel. The liner 100 has an asymmetric shape in the upper and lower parts of FIG. 15, and is used such that the upper side of the liner 100 in FIG. 15 is located outside the rack and the lower side is located inside the rack.
[0023]
The liner 100 is provided with a cut portion 102, a deformed portion corresponding portion 104, and a bolt hole 106, and the bolt hole 106 is provided so as to communicate with the bolt hole 48 of the vibration damping joint. The cut portion 102 has a large cutout facing the outside of the rack at a position corresponding to the flange portion of the vibration damping joint. The deformed portion corresponding portion 104 is a notch adapted to the shape of the deformed portion 24 of the vibration damping joint 21. When the thickness of the deformed portion is not reduced on the side of the vibration damping joint, the deformed portion corresponds to the deformed portion. The unit 104 is unnecessary.
[0024]
In the rack 2 of FIG. 1, when a horizontal force is applied due to an earthquake or the like, a compressive force is applied to one of the columns, and a pull-out force is applied to the other column, and the deformed portion 24 of the vibration damping joint is deformed by the pull-out force. The upper column member moves upward. At this time, in the column on the side to which the compressive force is applied, if the upper column member slightly rotates to the outside of the rack, the horizontal force can be released more effectively. Here, if the liner 100 is provided between the joints 20a and 20b and the cut portion 102 faces the outside of the rack, it becomes easy for the upper column member to rotate to the outside of the rack. Therefore, the durability of the rack against horizontal force is further improved.
[0025]
The liner 100 is a plate-shaped member provided between the upper and lower vibration damping joints, and is provided with attachment portions for the upper and lower vibration damping joints near both ends, and the liner central portion therebetween is moved to the outside of the rack of the upper column member. Any member may be used as long as the member is configured to make the rotation of the member easier than the inward rotation. For example, instead of providing the cut portion 102, the cut portion 102 may be made thinner.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a vibration control rack of an embodiment. FIG. 2 is a plan view of an automatic warehouse using the vibration control rack of the embodiment. FIG. 3 is a plan view of a vibration control joint used in the embodiment. 4 is a side view of the vibration damping joint of the embodiment. FIG. 5 is a view showing vibration absorption by plastic deformation of the vibration damping joint of the embodiment. The left side shows a state after plastic deformation, and the right side shows a state before plastic deformation. FIG. 6 shows seismic force applied in the span direction of the damping rack and absorption of vibration by the damping joint in the embodiment. FIG. 7 is a plan view of a damping joint of a modified example. FIG. 8 is a modified example. FIG. 9 is a plan view of a vibration control joint according to a second modification. FIG. 10 is a plan view of a vibration control joint according to a third modification. FIG. 11 is a control view of a vibration modification joint according to a fourth modification. FIG. 12 is a plan view of a vibration control joint according to a fifth modification. FIG. 13 is a plan view of a vibration control joint according to a fifth modification. 14 is a side view showing a deformation of the vibration damping joint according to the sixth modified example. FIG. 15 is a side view showing a modified example in which a liner is interposed between the vibration damping joints. Diagram showing the relationship between the seismic joint, the liner and the lower seismic control joint [Explanation of symbols]
2, 3 Damping racks 4, 6 Pillars 6a, b Pillar members 8, 10 Girder members 12, 14 Diagonal members 16 Rails 18 Conveying device 20a Upper joint 20b Lower joint 21 Vibration control joint 22 Flange part 24 Deformation part 26 Connection part 28 Bolt 30 Nut 40, 50, 60 Damping joint 42 Flange surface 44, 54, 64 Deformed part 46, 56, 66 Connection part 48 Bolt hole 55, 65 Hole 65 Groove 70, 80 Damping joint 74, 84 Deformed part 76, 86 Connection part 77, 83, 87 Rib 90 Vibration control joint 91 Upper joint 92 Lower joint 94 Connection part 96 Deformation part 98, 99 Mounting plate 100 Liner 102 Cut part 104 Deformation part corresponding part 106 Bolt hole

Claims

A vibration control rack having upper and lower joints, and a column connecting the upper and lower column members. At least one of the upper and lower joints allows the upper column member to move upward by plastic deformation. the deformation portion provided with which, set the connection portion of higher strength than connecting the upper joint and a lower joint on the outside of the displacement-type portion and the flexible portion,
Further, a flange portion is provided on each of the upper joint and the lower joint, the upper joint and the lower joint are overlapped while supporting the upper and lower column members with the flange portion, and the deformed portion is connected to the flange portion and the connection portion. A vibration control rack, which is provided between the rack.

The vibration control rack according to claim 1, wherein the deformed portion is thinner or narrower than the connection portion .

2. The vibration control rack according to claim 1, wherein the width in the span direction is narrower than the length in the girder direction, and the vibration due to horizontal stress in the span direction is damped by plastic deformation of a deformed portion of the joint. Or two vibration control racks.

The vibration control rack according to claim 1, wherein a groove or a hole is provided in the deformed portion .

2. The vibration control rack according to claim 1, wherein a rib is provided on the connection portion to reinforce the connection portion .