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JP4287984B2 - Base-isolated building structure - Google Patents
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JP4287984B2 - Base-isolated building structure - Google Patents

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JP4287984B2
JP4287984B2 JP2000168808A JP2000168808A JP4287984B2 JP 4287984 B2 JP4287984 B2 JP 4287984B2 JP 2000168808 A JP2000168808 A JP 2000168808A JP 2000168808 A JP2000168808 A JP 2000168808A JP 4287984 B2 JP4287984 B2 JP 4287984B2
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staircase
seismic isolation
wall
cutting
base
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JP2001349089A (en
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顯信 高畑
智昭 遠藤
典男 櫻川
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Takenaka Corp
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Takenaka Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、上部構造部と下部構造部との間に、それらの相対横揺れエネルギーを吸収自在な免震装置を介装させてある免震階を設け、前記免震階を昇降自在な階段部を、前記上部構造部と前記下部構造部とにわたって設けてある免震建物構造に関する。
【0002】
【従来の技術】
一般的な建物においては、階段部は、建物構造部に一体的に形成してあるわけであるが、免震建物においては、免震装置を境としてそれより上方の上部構造部と、それより下方の下部構造部とが、相対的に横移動することが前提であり、地震等の発生により上下の構造部が相対的に横揺れを起こした場合、前記階段部は、その横揺れに伴うセン断力を受けて破壊してしまう危険性がある。
従って、従来のこの種の免震建物構造としては、図10・11に示すように、免震装置3を設置してある天井に近い位置で、上部構造部Juと下部構造部Jdとに分離し、上部構造部Juである天井スラブSu・上部壁部2u・上柱Pu等と、下部構造部Jdである床スラブSd・下部壁部2d・下柱Pd等とが、分離した構造部境目21で相対的に横移動できるように構成してあった。また、階段部Kに関しては、免震階Tの上下ほぼ中間位置に設けてある踊り場20を境として、それより上方の上部階段部Kuと、それより下方の下部階段部Kdとに分離した構成とし、踊り場20の階段部境目22で、上部階段部Kuと下部階段部Kdとがスライドできる構成にしてあるものがあった(特開平11−148250号公報参照)。
そして、上下各階段部とも、側桁23を設けた構造であり、下部階段部Kdは、側桁23の下端部を床スラブSdに、上端部を踊り場20に夫々一体的に固着してあり、上部階段部Kuは、側桁23の上端部を天井スラブSuに対して一体連結してあると共に、下端部は、前記踊り場20上にスライド機構24を介して位置する状態に形成してあった。更には、上部階段部Kuについては、地震等によって上部構造部Juと下部構造部Jdとが相対的に横移動するに伴って側桁23が下部壁部Jdと干渉して破壊するのを防止するために、踏み板部25内に伸縮機構26を設け(図11参照)、左右両側桁23の間隔が、前記横移動に追従して変化できるように構成してあった。
【0003】
【発明が解決しようとする課題】
上述した従来の免震建物構造によれば、階段部に前記スライド機構や、踏み板部に伸縮機構を設ける必要があり、夫々の構造が複雑化し、コストアップにつながり易いことに加えて、建築手間が掛かり易い問題点がある。
【0004】
従って、本発明の目的は、上記問題点を解消し、簡単な構造で建築手間を掛けずに免震化を図れる免震建物構造を提供するところにある。
【0005】
【課題を解決するための手段】
請求項1の発明の特徴構成は、図6〜9に例示するごとく、上部構造部Juと下部構造部Jdとの間に、それらの相対横揺れエネルギーを吸収自在な免震装置3を介装させてある免震階Tを設け、前記免震階Tを昇降自在な階段部Kを、前記上部構造部Juと前記下部構造部Jdとにわたって設けてある免震建物構造において、前記階段部Kは、前記上部構造部Juに支持された上部階段部Kuと、前記下部構造部Jdに支持された下部階段部Kdとを、前記上部構造部Juと前記下部構造部Jdとの相対横揺れに伴う横移動を許容自在な階段切断部10を挟んだ状態に設けて構成し、前記上部構造部Juと前記下部構造部Jdと間に、それら夫々の相対横揺れに伴う横移動を許容自在な構造切断部8を設け、前記階段切断部10と前記構造切断部8とを、同一面内に配置してあるところにある。
【0006】
請求項1の発明の特徴構成によれば、前記階段切断部と前記構造切断部とを、同一面内に配置してあるから、例えば、地震等によって上部構造部と下部構造部とに相対的な横揺れが発生した場合であっても、前記同一面内に配置された前記階段切断部と構造切断部とが横揺れの境目となり、上部階段部が下部構造部に当接して干渉したり、下部階段部が上部構造部に当接して干渉したりするといったことことなく横揺れを許容することが可能となる。従って、前記横揺れに伴って階段部が他の部分と干渉して破壊するといったことを防止し易くなる。
そして、この作用は、従来のように、前記スライド機構や前記伸縮機構を設けなくても果たすことが可能であるから、建築各部の構造を簡単なものに構成することができ、建築手間の軽減、及び、建築コストの低減化を叶えることが可能となる。
【0007】
請求項2の発明の特徴構成は、図6に例示するごとく、前記上部階段部Kuは、前記上部構造部Juに形成した上部壁部2uに側縁部を支持された片持ち形式に構成してあり、前記下部階段部Kdは、前記下部構造部Jdに形成した下部壁部2dに側縁部を支持された片持ち形式に構成してあり、前記構造切断部8は、前記上部壁部2uと前記下部壁部2dと間に、それら夫々の相対横揺れに伴う横移動を許容自在に形成された壁切断部9であるところにある。
【0008】
請求項2の発明の特徴構成によれば、請求項1の発明による作用効果を叶えることができるのに加えて、上下の各階段部を、対応した上下の各壁部に側縁部を支持された片持ち形式の構成にしてあるから、前記階段切断部を、上下何れの位置に設定しても、上下の各階段部そのものは安定した状態のまま上下の各壁部に支持されており、前記階段切断部の高さ設定を、従来のように、踊り場に限定されることなく、自由に行うことが可能となる。その結果、階段切断部を、壁切断部の高さに合わせることも、容易に実施できるようになり、建物設計の自由性を向上させることが可能となる。
更には、既設建物を対象にして、後から、免震装置を取り付けるような免震化工事においても、前記階段切断部や、壁切断部の上下位置を、自由に設定することができると共に、既設の階段部を取り壊すことなく、元々の構造をそのまま生かした状態で免震化工事を実施することが可能となり、工期短縮やコストダウンを叶えることができるようになる。但し、当該免震建物構造は、既設建物のみを対象としたものではなく、新築建物に採用できることは言うまでもない。
【0009】
請求項3の発明の特徴構成は、図7〜9に例示するごとく、前記階段切断部10を被う階段カバー体11を、前記上部階段部Kuと前記下部階段部Kdとの何れか一方に取り付けてあるところにある。
【0010】
請求項3の発明の特徴構成によれば、請求項1又は2の発明による作用効果を叶えることができるのに加えて、例えば、地震等によって上部構造部と下部構造部とが相対的に横揺れするような場合に、上部階段部と下部階段部との合わせ目部分が一時的に開口したとしても、前記階段カバー体によってその開口を塞ぐことが可能となり、人や物が前記開口に入り込んだり、開口を通して転落したりすることを防止し易くなる。そして、階段カバー体は、前記上部階段部と前記下部階段部との何れか一方に取り付けてあるから、前記横揺れに伴うズレ力が集中的に作用して引きちぎられるといったことを防止し易くなり、前記開口の閉塞効果を持続させることが可能となる。
【0011】
請求項4の発明の特徴構成は、図7〜9に例示するごとく、前記壁切断部9を被う壁カバー体12を、前記上部壁部2u、又は、前記下部壁部2dの何れかに取り付けてあるところにある。
【0012】
請求項4の発明の特徴構成によれば、請求項1〜3の何れか一項の発明による作用効果を叶えることができるのに加えて、例えば、地震等によって上部構造部と下部構造部とが相対的に横揺れするような場合に、上部壁部と下部壁部との合わせ目部分が一時的に開口したとしても、前記壁カバー体によってその開口を塞ぐことが可能となり、人や物が前記開口に入り込んだり、開口を通して転落したりすることを防止し易くなる。そして、壁カバー体は、前記上部壁部と前記下部壁部との何れか一方に取り付けてあるから、前記横揺れに伴うズレ力が集中的に作用して引きちぎられるといったことを防止し易くなり、前記開口の閉塞効果を持続させることが可能となる。
【0013】
請求項5の発明の特徴構成は、図6に例示するごとく、前記階段切断部10と前記壁切断部9とは、前記免震装置3の装置高さ範囲内に配置してあるところにある。
【0014】
請求項5の発明の特徴構成によれば、請求項1〜4の何れか一項の発明による作用効果を叶えることができるのに加えて、免震階全体とした横揺れ面の高さを揃えることができるから、よりスムースに免震作用時の横揺れを許容することが可能となる。
そして、例えば、前記免震装置が、天井裏空間の高さ範囲に位置するように設置してある場合には、前記階段切断部や壁切断部も天井裏空間に設置されることになり、室内側に露出することがないから、美観性を損ね難い。
【0015】
尚、上述のように、図面との対照を便利にするために符号を記したが、該記入により本発明は添付図面の構成に限定されるものではない。
【0016】
【発明の実施の形態】
以下に本発明の実施の形態を図面に基づいて説明する。尚、図面において従来例と同一の符号で表示した部分は、同一又は相当の部分を示している。
【0017】
図1・2は、本発明の免震建物構造を取り入れてある建物Aを示すものであり、この建物Aは、建物完成後に、建物の使用状態を維持しながら、並行して柱の中間部に免震装置3を設置して免震化を図ってある(所謂、居ながら免震)ものである。
前記建物Aは、地下一階、地上八階、塔屋三階からなる鉄骨鉄筋コンクリート構造で構成され、横揺れエネルギーを吸収自在な免震階Tを地上一階層F1に設けてある。これは、上述の通り、建物の使用状態を維持するために、免震化工事を地上一階層F1で集中的に実施し、他階層においては、工事中も通常通り使用できるようにするために設定されている。
又、建物Aは、全階層を通じて複数の柱P・梁B・スラブS・壁部2・階段部Kを備えた建物構造部1で構成してある。
そして、図1・2から見られるように、隣接する柱P間に梁Bが設けられ、各梁Bによって囲まれた部分にスラブSが設けられている。また、階段部Kは、床スラブSdと天井スラブSuとにわたって昇降自在に構成してあり、壁部2に囲まれた階段室内に設けられている。
【0018】
前記免震階Tを除く他の階層は、通常設計による柱(以後、一般柱という)P1を、平面図における横列と縦列との各交点に配して構成してある。
【0019】
前記免震階Tについては、各柱の配置は他の階層と同様であるが、柱の構成を異ならせて地震の横揺れエネルギーを吸収できるように構成してある。
具体的には、最外列に位置する柱以外の柱(以後、免震柱という)P2は、前記一般柱P1より高強度に形成してあると共に、長手方向の中間部に免震装置3を介在させてある。
そして、最外列に位置する柱(以後、増強柱という)P3は、図3に示すように、前記一般柱P1と同様の柱の外周部に低降伏点鋼材を囲繞して一体化を図り、靱性の増強を図ってある。
【0020】
前記免震装置3は、図4に示すように、金属製薄板3aとゴム製薄板3bとを交互に積層させて一体化し、夫々の薄板3a・3bどうしが横方向に層間変位自在に形成してあることによって、前記免震柱P2の上端部と下端部との横方向相対移動に抵抗しながら追従し、免震効果を発揮できるように構成してあるものである。尚、前記各薄板3a・3bの中央部には、夫々を貫通する状態に鉛製の棒状体3cを設けてあり、前記各薄板3a・3bの層間変位に対するダンパー効果をより増強できるように構成してある。また、上下端部には、免震装置胴部分より一回り大きな金属製端面フランジ部3dを一体的に設けてある。この端面フランジ部3dの縁部には、柱体へのボルト固定のためのボルト挿通孔3eを、複数設けてある。
前記免震装置3を介在させてある部分を免震部4という(図6参照)。
【0021】
前記免震柱P2は、図5に示すように、元々、上下に連続した柱Pを、前記免震装置3を設置しようとする部分(前記免震部4)を切断除去し、免震部4より上に残った上柱Puと、免震部4より下に残った下柱Pdとに分断し、その免震部4に免震装置3を取り付けて構成してある。
従って、免震階Tにおいては、地震等による横揺れによって、前記免震装置3を境として、それより上方に位置する上柱Pu・梁Bu・天井スラブSu・上部壁部2u・上部階段部Ku(以上の構成は上部構造部Juに相当)と、免震装置3より下方に位置する下柱Pd・梁Bd・床スラブSd・下部壁部2d・下部階段部Kd(以上の構成は下部構造部Jdに相当)とが相対的に横移動し、横揺れエネルギーの緩和・吸収を図ることができるものである。
因みに、前記免震装置3は、上柱Puの下端部5、及び、下柱Pdの上端部6に、夫々、嵌合状態に取り付けられた金属製の有底筒7を介して取り付けられている。
【0022】
また、前記上部構造部Juと下部構造部Jdとは、上述の通り、免震部4を境として、それぞれの相対横揺れエネルギーを吸収自在に構成されているわけであるが、夫々の境目である構造切断部8は、図6に示すように、前記免震装置3の装置設置範囲内、即ち、天井裏の高さになるように配置してある。
従って、前記上部壁部2u・下部壁部2dどうしの境目である壁切断部9、及び、上部階段部Ku・下部階段部Kdどうしの境目である階段切断部10も、構造切断部8と同一面内になるように構成されている。
【0023】
ここで、壁部2と階段部Kとの関係について説明すると、図6・7に示すように、前記上部階段部Kuは、前記上部壁部2uに側縁部を支持された片持ち形式に構成してあると共に、前記下部階段部Kdも、同様に前記下部壁部2dに側縁部を支持された片持ち形式に構成してあり、前記免震部4と同じ高さに設けられた壁切断部9・階段切断部10を境として、それぞれ相対横移動できる状態に構成されている。具体的には、本実施形態においては、免震化前の建物状態で、前記壁切断部9・階段切断部10に相当する箇所に、カッター等の切断具を使用して切れ目を入れて前記各切断部を形成してある。
従って、例えば、地震等の作用によって建物に横揺れが加わった場合、図9に示すように、上部構造部Ju・下部構造部Jd相互は、同一面内に形成された各切断部9・10を境目としてどの方向にも相対横移動できるから、両構造部どうしが干渉してその部分で破壊するといったことを防止しながら、前記免震装置3によって免震を図ることが可能となる。
【0024】
また、階段室内に面する部分を対象として、前記階段切断部10を被う階段カバー体11、及び、前記壁切断部9を被う壁カバー体12をそれぞれ設けてある。従って、普段は、前記各切断部9・10が露出するのを防止でき、意匠性の向上が図られている。そして、地震時には、前記相対移動によってずれる上下の各階段部・各壁部の間に一時的にできる開口13を、前記各カバー体11・12が閉塞して、その部分に挟まれたり、その部分から転落するといったことを防止することができるものである。
前記各カバー体11・12は、それぞれ薄鋼板で形成してあり、上部階段部Ku・上部壁部2uにのみ各別にボルト固定してある。従って、両カバー体11・12は、前記横揺れ時に、上部階段部Ku・上部壁部2uと共に移動するものの、下部階段部Kd・下部壁部2dとは自由に位置ずれすることができ、鋼板の可撓性を有効に生かして、前記開口13をカバーすることが可能となる。即ち、各カバー体11・12が、上下ともに固定されている場合には、前記横揺れに伴って上下の固定部間隔が広がるに伴って、それら固定部分に応力集中が起こり、カバー体が引きちぎれる危険性があるが、当該構造によれば、上述の通り、柔軟に対応することができるわけである。
また、本実施形態の建物の場合、前記免震階Tに免震柱P2と増強柱P3とを併用してあることによって、地震時の横揺れを小さく抑えながら且つ免震を図ることが可能となるので、前記開口13が大きくなるのを抑制でき、それに伴って、前記各カバー体11・12の幅寸法も小さな寸法に設定することができ、室内側美観性の向上を図ることができるものである。
【0025】
本実施形態の建物によれば、免震化を図るにあたり複雑な構造となり易い階段室部分においても、その構造を簡単なものに構成することができ、建築手間の軽減、及び、建築コストの低減化を叶えることが可能となる。
【0026】
〔別実施形態〕
以下に他の実施の形態を説明する。
【0027】
〈1〉 前記建物は、先の実施形態で説明した鉄骨鉄筋コンクリート構造に限るものではなく、例えば、鉄筋コンクリート造や鉄骨造や鋼管コンクリート造であってもよい。また、建物完成後に、建物の使用状態を維持しながら、並行して柱の中間部に免震装置3を設置して免震化を図ってある(所謂、居ながら免震)ものに限るものではなく、新築建物であってもよい。
柱の配置についても、先の実施形態で説明した矩形配置に限るものではない。そして、免震階Tにおける柱Pの構成は、先の実施形態で説明したように増強柱P3と免震柱P2との併用に限定されるものでなく、例えば、免震柱P2単独であったり、免震柱P2と一般柱P1との併用であってもよい。
〈2〉 免震階Tは、地上一階層F1に設けられるものに限るものではなく、それ以外の階層に設けてあってもよい。
〈3〉 前記免震装置3は、先の実施形態で説明したように、金属製薄板3aとゴム製薄板3bとを交互に積層させて一体化した構成のものに限らず、鉛ダンパーや、オイルダンパー等によって構成してあるものであってもよく、それらを総称して、免震装置という。また、免震装置3の取付位置は、柱Pの上端部分に設定してあるものに限らず、柱Pの中間部分や下端部分に設定してあってもよい。〈4〉 前記上部階段部Ku、及び、前記下部階段部Kdは、側縁部を前記壁部に支持された片持ち形式のものに限らず、様々な構造を採ることが可能である。例えば、上部階段部Kuは、天井スラブSuや、梁Buに端縁部を支持された片持ち形式をとったり、更には、上部壁部2uにも支持させた構造を採ることも可能で、下部階段部Kdについても、同様の変形が可能で、要するに、各階段部Ku・Kdは、夫々が強度的に安定するように構成してあれば、その支持形態は、自由に選定することが可能である。
【図面の簡単な説明】
【図1】建物を示す断面図
【図2】建物の免震階の平面図
【図3】増強柱の要部を示す一部切欠き斜視図
【図4】免震装置の要部を示す一部切欠き斜視図
【図5】免震装置の取付説明図
【図6】階段部を示す断面図
【図7】階段部を示す断面図
【図8】階段部を示す斜視図
【図9】階段部の位置ずれを示す説明断面図
【図10】従来の建物の要部を示す側面視断面図
【図11】従来の建物の階段要部を示す断面図
【符号の説明】
2u 上部壁部
2d 下部壁部
3 免震装置
8 構造切断部
9 壁切断部
10 階段切断部
11 階段カバー体
12 壁カバー体
Ju 上部構造部
Jd 下部構造部
K 階段部
Ku 上部階段部
Kd 下部階段部
T 免震階
[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a seismic isolation floor is provided between an upper structure portion and a lower structure portion, with a seismic isolation device interposed between the upper structure portion and the lower structure portion. The present invention relates to a base-isolated building structure in which a part is provided across the upper structure part and the lower structure part.
[0002]
[Prior art]
In a general building, the staircase is formed integrally with the building structure. However, in a base-isolated building, the upper structure is located above it with the seismic isolation device as a boundary. It is assumed that the lower lower structure part moves relatively sideways, and when the upper and lower structure parts cause a relative roll due to the occurrence of an earthquake or the like, the staircase part accompanies the roll There is a risk of destruction due to the force of shear.
Therefore, as a conventional seismic isolation building structure of this type, as shown in FIGS. 10 and 11, the upper structure portion Ju and the lower structure portion Jd are separated at a position close to the ceiling where the seismic isolation device 3 is installed. The ceiling slab Su, the upper wall 2u, the upper pillar Pu, etc., which are the upper structural part Ju, and the floor slab Sd, the lower wall part 2d, the lower pillar Pd, etc., which are the lower structural parts Jd, are separated. 21 was configured to be relatively laterally movable. The staircase K is separated into an upper staircase Ku above it and a lower staircase Kd below it, with a landing 20 located approximately halfway up and down the seismic isolation floor T as a boundary. In some cases, the upper stepped portion Ku and the lower stepped portion Kd can slide at the stepped portion boundary 22 of the landing 20 (see Japanese Patent Application Laid-Open No. 11-148250).
Each of the upper and lower stairs has a structure in which side girders 23 are provided. The lower stairs Kd is integrally fixed to the floor slab Sd at the lower end of the side girders 23 and to the landing 20 at the upper end. The upper stepped portion Ku has an upper end portion of the side beam 23 integrally connected to the ceiling slab Su, and a lower end portion is formed on the landing 20 via a slide mechanism 24. It was. Further, as for the upper staircase Ku, the side girders 23 are prevented from interfering with the lower wall portion Jd and being destroyed as the upper structure portion Ju and the lower structure portion Jd relatively move laterally due to an earthquake or the like. In order to achieve this, an expansion / contraction mechanism 26 is provided in the tread plate 25 (see FIG. 11), and the distance between the left and right side beams 23 can be changed following the lateral movement.
[0003]
[Problems to be solved by the invention]
According to the conventional base-isolated building structure described above, it is necessary to provide the slide mechanism on the staircase and the expansion / contraction mechanism on the tread board, and each structure becomes complicated and easily leads to cost increase. There is a problem that it is easy to start.
[0004]
Accordingly, an object of the present invention is to provide a base-isolated building structure that solves the above-mentioned problems and can achieve base isolation with a simple structure and without any construction effort.
[0005]
[Means for Solving the Problems]
As illustrated in FIGS. 6 to 9, the characteristic configuration of the invention of claim 1 is provided with an seismic isolation device 3 capable of absorbing the relative roll energy between the upper structure portion Ju and the lower structure portion Jd. In the base-isolated building structure in which a seismic isolation floor T is provided and a staircase portion K that can be moved up and down is provided between the upper structure portion Ju and the lower structure portion Jd, the staircase portion K The upper stepped portion Ku supported by the upper structure portion Ju and the lower stepped portion Kd supported by the lower structure portion Jd are made to roll relative to each other between the upper structure portion Ju and the lower structure portion Jd. It is configured so as to sandwich the staircase cutting part 10 that allows the lateral movement accompanying it, and the lateral movement accompanying the relative roll of each of the upper structure part Ju and the lower structure part Jd is allowed. The structure cutting part 8 is provided, and the step cutting part 10 and the structure And a cross section 8, there is to that is disposed in the same plane.
[0006]
According to the characteristic configuration of the invention of claim 1, since the staircase cutting portion and the structural cutting portion are arranged in the same plane, for example, relative to the upper structure portion and the lower structure portion due to an earthquake or the like. Even if a significant roll occurs, the staircase cutting part and the structural cutting part arranged in the same plane serve as a boundary of rolling, and the upper staircase part contacts and interferes with the lower structural part. Thus, it is possible to allow the roll to occur without the lower staircase portion coming into contact with and interfering with the upper structure portion. Therefore, it becomes easy to prevent the staircase portion from interfering with other portions and being destroyed due to the rolling.
And since this action can be achieved without providing the slide mechanism and the telescopic mechanism as in the prior art, the structure of each part of the building can be made simple, and the construction effort can be reduced. And it becomes possible to achieve reduction of construction cost.
[0007]
The characteristic configuration of the invention of claim 2 is, as illustrated in FIG. 6, the upper stepped portion Ku is configured in a cantilever type in which a side edge portion is supported by an upper wall portion 2 u formed in the upper structure portion Ju. The lower stepped portion Kd is configured in a cantilever type with a side edge supported by a lower wall portion 2d formed in the lower structure portion Jd, and the structural cutting portion 8 is formed of the upper wall portion The wall cutting portion 9 is formed between the 2u and the lower wall portion 2d so as to be allowed to move laterally due to their relative rolls.
[0008]
According to the characteristic configuration of the invention of claim 2, in addition to being able to achieve the function and effect of the invention of claim 1, the upper and lower steps are supported, and the side edges are supported by the corresponding upper and lower walls. Therefore, the upper and lower staircases are supported by the upper and lower wall parts in a stable state regardless of whether the staircase cutting part is set at any position. The height of the staircase cutting section can be freely set without being limited to a landing as in the prior art. As a result, the step cutting part can be easily adjusted to the height of the wall cutting part, and the freedom of building design can be improved.
Furthermore, for the existing building, in the seismic isolation work such as attaching a seismic isolation device later, the stairs cutting part and the vertical position of the wall cutting part can be freely set, It is possible to carry out seismic isolation work without destroying the existing staircase, while maintaining the original structure as it is, and the construction period can be shortened and the cost can be reduced. However, it goes without saying that the seismic isolation building structure is not intended only for existing buildings but can be adopted for new buildings.
[0009]
As illustrated in FIGS. 7 to 9, the characteristic configuration of the invention of claim 3 is that the staircase cover body 11 covering the staircase cutting portion 10 is placed on either the upper staircase portion Ku or the lower staircase portion Kd. It is where it is attached.
[0010]
According to the characteristic configuration of the invention of claim 3, in addition to being able to achieve the function and effect of the invention of claim 1 or 2, the upper structure portion and the lower structure portion are relatively moved sideways by an earthquake or the like, for example. In the case of shaking, even if the joint portion between the upper step portion and the lower step portion is temporarily opened, the opening can be closed by the step cover body, and people and objects enter the opening. It is easy to prevent dripping or falling through the opening. And since the staircase cover body is attached to either the upper staircase portion or the lower staircase portion, it becomes easy to prevent the displacement force accompanying the roll from acting intensively and being torn off. The opening blocking effect can be maintained.
[0011]
As illustrated in FIGS. 7 to 9, the characteristic configuration of the invention of claim 4 is that the wall cover body 12 covering the wall cutting part 9 is attached to either the upper wall part 2 u or the lower wall part 2 d. It is where it is attached.
[0012]
According to the characteristic configuration of the invention of claim 4, in addition to being able to achieve the operational effect of the invention of any one of claims 1 to 3, Even if the joint portion between the upper wall portion and the lower wall portion is temporarily opened, the opening can be closed by the wall cover body. Can be prevented from entering the opening or falling through the opening. And since the wall cover body is attached to either one of the upper wall portion and the lower wall portion, it becomes easy to prevent the displacement force accompanying the roll from acting intensively and torn off. The opening blocking effect can be maintained.
[0013]
The characteristic configuration of the invention of claim 5 is that, as illustrated in FIG. 6, the staircase cutting portion 10 and the wall cutting portion 9 are arranged within the device height range of the seismic isolation device 3. .
[0014]
According to the characteristic configuration of the invention of claim 5, in addition to being able to achieve the function and effect of the invention of any one of claims 1 to 4, the height of the rolling surface of the entire seismic isolation floor is reduced. Since they can be aligned, it is possible to allow rolls more smoothly during seismic isolation.
And, for example, when the seismic isolation device is installed so as to be located in the height range of the ceiling space, the staircase cutting part and the wall cutting part are also installed in the ceiling space, Since it is not exposed indoors, it is difficult to impair aesthetics.
[0015]
In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.
[0017]
FIGS. 1 and 2 show a building A incorporating the seismic isolation building structure of the present invention. This building A maintains the state of use of the building after the building is completed, and in parallel with the middle part of the column. The seismic isolation device 3 is installed in the seismic isolation system (so-called seismic isolation while living).
The building A is composed of a steel reinforced concrete structure consisting of a first basement floor, an eighth floor above ground, and a third floor tower, and a seismic isolation floor T capable of absorbing roll energy is provided on the first floor F1. As mentioned above, in order to maintain the state of use of the building, the seismic isolation work is concentrated on the ground level F1 so that other levels can be used as usual during construction. Is set.
The building A is composed of a building structure portion 1 having a plurality of pillars P, beams B, slabs S, walls 2 and stairs K through all levels.
1 and 2, a beam B is provided between adjacent columns P, and a slab S is provided in a portion surrounded by each beam B. Further, the staircase portion K is configured to be movable up and down over the floor slab Sd and the ceiling slab Su, and is provided in a staircase room surrounded by the wall portion 2.
[0018]
The other layers excluding the seismic isolation floor T are configured by arranging normal-designed columns (hereinafter referred to as general columns) P1 at the intersections of the rows and columns in the plan view.
[0019]
As for the seismic isolation floor T, the arrangement of the columns is the same as that of the other layers, but the structure of the columns is made different so that the roll energy of the earthquake can be absorbed.
Specifically, the columns P2 other than the columns located in the outermost row (hereinafter referred to as seismic isolation columns) P2 are formed with higher strength than the general columns P1, and the seismic isolation device 3 is provided in the middle in the longitudinal direction. Is interposed.
As shown in FIG. 3, the column P3 located in the outermost row (hereinafter referred to as a strengthening column) P1 is integrated by surrounding a low yield point steel material on the outer periphery of the column similar to the general column P1. The toughness is increased.
[0020]
As shown in FIG. 4, the seismic isolation device 3 is formed by alternately laminating metal thin plates 3a and rubber thin plates 3b so that the thin plates 3a and 3b are formed so as to be capable of inter-layer displacement in the lateral direction. Therefore, it is configured such that it can follow the lateral movement of the upper and lower ends of the seismic isolation column P2 while resisting the lateral movement, and exhibit the seismic isolation effect. In addition, the rod-shaped body 3c made from lead is provided in the state which penetrates each thin plate 3a * 3b, and it is comprised so that the damper effect with respect to the interlayer displacement of each said thin plate 3a * 3b can be strengthened more. It is. In addition, the upper and lower end portions are integrally provided with a metal end face flange portion 3d that is slightly larger than the seismic isolation device body portion. A plurality of bolt insertion holes 3e for fixing bolts to the column body are provided at the edge of the end face flange portion 3d.
A portion where the seismic isolation device 3 is interposed is referred to as a seismic isolation portion 4 (see FIG. 6).
[0021]
As shown in FIG. 5, the seismic isolation column P2 originally has a column P that is vertically continuous by cutting and removing a portion (the seismic isolation unit 4) where the seismic isolation device 3 is to be installed. The upper pillar Pu remaining above 4 and the lower pillar Pd remaining below the seismic isolation part 4 are divided, and the seismic isolation device 3 is attached to the seismic isolation part 4.
Therefore, in the seismic isolation floor T, the upper pillar Pu, the beam Bu, the ceiling slab Su, the upper wall portion 2u, the upper staircase portion located above the seismic isolation device 3 from the seismic isolation device 3 due to rolling due to an earthquake or the like. Ku (the above configuration corresponds to the upper structure portion Ju), the lower column Pd, the beam Bd, the floor slab Sd, the lower wall portion 2d, the lower stepped portion Kd (the above configuration is the lower portion) located below the seismic isolation device 3 The structure portion Jd) is relatively moved laterally, and the rolling energy can be relaxed and absorbed.
Incidentally, the said seismic isolation apparatus 3 is attached to the lower end part 5 of the upper pillar Pu, and the upper end part 6 of the lower pillar Pd via the metal bottomed cylinder 7 attached to the fitting state, respectively. Yes.
[0022]
In addition, as described above, the upper structure portion Ju and the lower structure portion Jd are configured so as to be capable of absorbing the respective relative roll energy with the seismic isolation portion 4 as a boundary. As shown in FIG. 6, a certain structural cutting portion 8 is arranged within the device installation range of the seismic isolation device 3, that is, at the height of the ceiling.
Therefore, the wall cutting portion 9 that is the boundary between the upper wall portion 2u and the lower wall portion 2d and the staircase cutting portion 10 that is the boundary between the upper staircase portion Ku and the lower staircase portion Kd are also the same as the structural cutting portion 8. It is configured to be in-plane.
[0023]
Here, the relationship between the wall portion 2 and the stepped portion K will be described. As shown in FIGS. 6 and 7, the upper stepped portion Ku is in a cantilever type in which a side edge portion is supported by the upper wall portion 2u. In addition, the lower stepped portion Kd is also configured in a cantilever manner with side edges supported by the lower wall portion 2d, and is provided at the same height as the seismic isolation portion 4. The wall cutting part 9 and the staircase cutting part 10 are used as a boundary so that they can move relative to each other. Specifically, in the present embodiment, in the building state before the seismic isolation, in a place corresponding to the wall cutting part 9 and the staircase cutting part 10 using a cutting tool such as a cutter, Each cutting part is formed.
Therefore, for example, when rolling is applied to the building due to the action of an earthquake or the like, as shown in FIG. 9, the upper structure portion Ju and the lower structure portion Jd are separated from each other by the cut portions 9 and 10 formed in the same plane. Therefore, the seismic isolation device 3 makes it possible to achieve seismic isolation while preventing the two structural portions from interfering with each other and destroying at that portion.
[0024]
Further, a staircase cover body 11 covering the staircase cutting section 10 and a wall cover body 12 covering the wall cutting section 9 are provided for a portion facing the staircase. Therefore, it is usually possible to prevent the cutting portions 9 and 10 from being exposed, and the design is improved. And, in the event of an earthquake, the openings 13 that are temporarily formed between the upper and lower steps and walls that are displaced by the relative movement are closed by the cover bodies 11 and 12, It can prevent falling from the part.
Each of the cover bodies 11 and 12 is formed of a thin steel plate, and is bolted to only the upper stepped portion Ku and the upper wall portion 2u. Accordingly, both the cover bodies 11 and 12 move together with the upper stepped portion Ku and the upper wall portion 2u at the time of the roll, but can be freely displaced from the lower stepped portion Kd and the lower wall portion 2d. It is possible to cover the opening 13 by making effective use of the flexibility. That is, when the cover bodies 11 and 12 are fixed both vertically, as the distance between the upper and lower fixed parts increases with the rolling, stress concentration occurs in the fixed parts, and the cover bodies are torn off. However, according to the structure, as described above, it is possible to respond flexibly.
In the case of the building of this embodiment, the seismic isolation column P2 and the reinforcing column P3 are used together on the seismic isolation floor T, so that it is possible to achieve seismic isolation while minimizing rolls during an earthquake. Therefore, it is possible to suppress the opening 13 from becoming large, and accordingly, the width of each of the cover bodies 11 and 12 can be set to a small dimension, and the indoor aesthetics can be improved. Is.
[0025]
According to the building of this embodiment, even in a staircase portion that tends to be a complicated structure for seismic isolation, the structure can be made simple, reducing labor and building costs. Can be realized.
[0026]
[Another embodiment]
Other embodiments will be described below.
[0027]
<1> The building is not limited to the steel reinforced concrete structure described in the previous embodiment, and may be, for example, a reinforced concrete structure, a steel frame structure, or a steel pipe concrete structure. In addition, after the building is completed, the seismic isolation device 3 is installed in the middle part of the column in parallel with maintaining the state of use of the building, and the seismic isolation is intended (so-called seismic isolation while living) Instead, it may be a new building.
The arrangement of the pillars is not limited to the rectangular arrangement described in the previous embodiment. And the structure of the pillar P in the seismic isolation floor T is not limited to the combined use of the reinforcement pillar P3 and the seismic isolation pillar P2 as described in the previous embodiment. Or a combination of the seismic isolation column P2 and the general column P1.
<2> The seismic isolation floor T is not limited to that provided in the ground level F1, and may be provided in other levels.
<3> As described in the previous embodiment, the seismic isolation device 3 is not limited to a configuration in which the metal thin plates 3a and the rubber thin plates 3b are alternately stacked and integrated, but a lead damper, An oil damper or the like may be used, and these are collectively referred to as a seismic isolation device. In addition, the mounting position of the seismic isolation device 3 is not limited to that set at the upper end portion of the column P, and may be set at the middle portion or the lower end portion of the column P. <4> The upper stepped portion Ku and the lower stepped portion Kd are not limited to the cantilever type in which the side edge is supported by the wall portion, and various structures can be adopted. For example, the upper staircase Ku can take the form of a cantilever with the edge supported by the ceiling slab Su or the beam Bu, and can also be supported by the upper wall 2u. The staircase Kd can be modified in the same way. In short, if each staircase Ku / Kd is configured to be stable in strength, its support form can be freely selected. It is.
[Brief description of the drawings]
[Fig. 1] Cross-sectional view showing a building [Fig. 2] Plan view of the base isolation floor of the building [Fig. 3] Partially cutaway perspective view showing the main part of the reinforcing column [Fig. 4] Main part of the base isolation device FIG. 5 is a perspective view showing a stepped portion. FIG. 6 is a sectional view showing a staircase. FIG. 7 is a perspective view showing a staircase. ] Cross-sectional view showing the main part of a conventional building [FIG. 11] Cross-sectional view showing the main part of a conventional building [Description of symbols]
2u Upper wall part 2d Lower wall part 3 Seismic isolation device 8 Structural cutting part 9 Wall cutting part 10 Stair cutting part 11 Stair cover body 12 Wall cover body Ju Upper structural part Jd Lower structural part K Stair part Ku Upper stair part Kd Lower staircase Part T Seismic isolation floor

Claims (5)

上部構造部と下部構造部との間に、それらの相対横揺れエネルギーを吸収自在な免震装置を介装させてある免震階を設け、前記免震階を昇降自在な階段部を、前記上部構造部と前記下部構造部とにわたって設けてある免震建物構造であって、
前記階段部は、前記上部構造部に支持された上部階段部と、前記下部構造部に支持された下部階段部とを、前記上部構造部と前記下部構造部との相対横揺れに伴う横移動を許容自在な階段切断部を挟んだ状態に設けて構成し、前記上部構造部と前記下部構造部と間に、それら夫々の相対横揺れに伴う横移動を許容自在な構造切断部を設け、前記階段切断部と前記構造切断部とを、同一面内に配置してある免震建物構造。
Between the upper structure part and the lower structure part, a seismic isolation floor is provided with a seismic isolation device capable of absorbing the relative rolling energy thereof, and a staircase part capable of moving up and down the seismic isolation floor, A base-isolated building structure provided between the upper structure part and the lower structure part,
The staircase portion moves between an upper staircase portion supported by the upper structure portion and a lower staircase portion supported by the lower structure portion along with a relative roll between the upper structure portion and the lower structure portion. Is provided in a state sandwiching an allowable staircase cutting portion, and a structural cutting portion is provided between the upper structure portion and the lower structure portion, which is allowed to move laterally due to their relative rolls, The base-isolated building structure which has arrange | positioned the said staircase cutting part and the said structural cutting part in the same surface.
前記上部階段部は、前記上部構造部に形成した上部壁部に側縁部を支持された片持ち形式に構成してあり、前記下部階段部は、前記下部構造部に形成した下部壁部に側縁部を支持された片持ち形式に構成してあり、前記構造切断部は、前記上部壁部と前記下部壁部と間に、それら夫々の相対横揺れに伴う横移動を許容自在に形成された壁切断部である請求項1に記載の免震建物構造。The upper staircase portion is configured in a cantilever form with side edges supported by an upper wall portion formed in the upper structure portion, and the lower staircase portion is formed on a lower wall portion formed in the lower structure portion. The side edge portion is supported in a cantilever type, and the structural cutting portion is formed between the upper wall portion and the lower wall portion so as to allow a lateral movement associated with their relative rolls. The base-isolated building structure according to claim 1, wherein the base-isolated building structure is a wall cut portion. 前記階段切断部を被う階段カバー体を、前記上部階段部と前記下部階段部との何れか一方に取り付けてある請求項1又は2の何れかに記載の免震建物構造。The seismic isolation building structure according to any one of claims 1 and 2, wherein a staircase cover body covering the staircase cutting portion is attached to either the upper staircase portion or the lower staircase portion. 前記壁切断部を被う壁カバー体を、前記上部壁部、又は、前記下部壁部の何れかに取り付けてある請求項2又は3の何れかに記載の免震建物構造。The base-isolated building structure according to any one of claims 2 and 3, wherein a wall cover body covering the wall cutting portion is attached to either the upper wall portion or the lower wall portion. 前記階段切断部と前記壁切断部とは、前記免震装置の装置高さ範囲内に配置してある請求項2〜4の何れか一項に記載の免震建物構造。The seismic isolation building structure according to any one of claims 2 to 4, wherein the staircase cutting portion and the wall cutting portion are arranged within a device height range of the seismic isolation device.
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