JP2004285691A

JP2004285691A - Earthquake-resisting reinforced extension method of building and earthquake-resisting reinforced extension building

Info

Publication number: JP2004285691A
Application number: JP2003078956A
Authority: JP
Inventors: Norifumi Konakawa; 憲史粉川; Itsuo Kishimoto; 逸男岸本; Masao Komori; 正夫小森; Shozo Takigawa; 昇三瀧川; Shigeru Kashiwasuga; 茂栢菅; Yutaka Kamigo; 裕上郷; Yasumasa Yamamoto; 泰正山本; Junya Sakai; 順也酒井; Yoriko Igawa; 依子井川; Yaeko Kida; 八重子貴田
Original assignee: Miracle Three Corp
Current assignee: Miracle Three Corp
Priority date: 2003-03-20
Filing date: 2003-03-20
Publication date: 2004-10-14
Anticipated expiration: 2023-03-20
Also published as: CN1759222A; HK1084167A1; WO2004083560A1; GB0518680D0; CN100348823C; JP4163539B2; GB2414269B; KR20060003864A; US20060156647A1; GB2414269A

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake-resisting reinforced extension method of a building and an earthquake-resisting reinforced extension building, extending a medium-story building such as stair hall-type apartment house to a high rise building while residents live therein, and modifying an existing building designed on the basis of the former earthquake-resisting standard to a high rise building satisfying new earthquake-resisting standard with extension. <P>SOLUTION: In this extension method, a base isolation foundation for the high rise building is newly disposed on the outside of the foundation of the existing medium story building, support members are erected on the newly disposed base-isolation foundation and subsequently the support members are used to form a new living floor above the existing building, thereby extending the medium story building to the high rise building. In the method, after the completion of the new living floor, an upper layer floor of the existing medium story building is knocked down and removed to sequentially remodel the remaining floors. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、建築物の耐震補強増築方法および耐震補強増築建築物に関し、特に階段室型共同住宅等の中層建築物を、耐震性に優れた高層建築物に増築することができる建築物の耐震補強増築方法および耐震補強増築建築物に関する。
【０００２】
【従来の技術】
１９６０〜１９７０年頃にかけて、我が国においては、都市部近郊における急激な人口増加に対応するために、数多くの中層集合住宅が建築された。
このような集合住宅の多くは、隣接する住戸間に各住戸への出入口に接続する屋外階段を備えた構造を有するいわゆる階段室型共同住宅である。
一般に、このような階段室型共同住宅の居住者は高齢者が多いため、上層階の居住者は階段での上り下りが大変であるという問題があり、高齢者に優しいバリアフリー化住宅への改築が望まれている。
しかし、既存の階段室型共同住宅を解体して建て替えるためには、膨大な量の建築廃材の発生、多額の施工費用、建て替えに伴う居住者の引越しなど、クリアしなければならない多くの問題がある。
【０００３】
この問題点に鑑みて、既存の階段室型共同住宅を片廊下型の共同住宅に改築する方法が提案されている（特許文献１参照）。
【０００４】
【特許文献１】
特開平１１−１５９１５３号公報
【０００５】
【発明が解決しようとする課題】
この特許文献１の開示技術は、居住者が住みながらにして、既存の階段室型共同住宅を片廊下型の共同住宅に改築して新たにエレベータを設置することができるという点では優れたものであった。
しかしながら、従来の階段室型共同住宅の多くは旧耐震基準で構造設計されており耐震性に問題があるが、上記特許文献１の技術ではこのような耐震性の問題には何ら考慮がなされていなかった。
また、改築に際して居住空間（住戸数）を増やしたいという要求がある場合があるが、この特許文献１の開示技術ではこのような要求に応えることができなかった。
【０００６】
本発明は上記したような従来技術の問題点を解決すべくなされたものであって、階段室型共同住宅等の中層建築物を居住者が住みながらにして高層建築物に増築することができるとともに、増築に伴って旧耐震基準で設計された既存建築物を新耐震基準を満たす高層建築物へと変えることが可能な建築物の耐震補強増築方法および耐震補強増築建築物を提供せんとするものである。
【０００７】
【課題を解決するための手段】
請求項１に係る発明は、既存の中層建築物の基礎の外側に高層建築物用の免震基礎を新たに設け、新たに設けられた免震基礎の上に支持部材を立設し、次いで該支持部材を利用して既存建築物の上方に新たな居住階を形成することにより、中層建築物を高層建築物へと増築する方法であって、前記新たな居住階の完成後に、前記既存の中層建築物について、地上部の各階を順次改装するとともに、既存の杭基礎を補強することを特徴とする建築物の耐震補強増築方法に関する。
請求項２に係る発明は、前記既存の杭基礎の補強が、既存の杭基礎の周囲を掘削してフーチングの周囲にコンクリートを充填することにより、該フーチングの横断面積を増加させることを特徴とする請求項１記載の建築物の耐震補強増築方法に関する。
請求項３に係る発明は、既存の中層建築物の基礎の外側に高層建築物用の免震基礎を新たに設け、該新たに設けられた免震基礎の上に支持部材を立設し、次いで該支持部材を利用して既存建築物の上方に新たな居住階を形成することにより、中層建築物を高層建築物へと増築する方法であって、前記新たな居住階の完成後に、前記既存の中層建築物の地上部を解体撤去し、これにより形成された空間内にて前記支持部材間に梁を架構して２階以上の床を構築し、次いで１階の床を既存の杭基礎の上部に設け、しかる後に形成された各階の床上に新たな居住空間を形成することを特徴とする建築物の耐震補強増築方法に関する。
請求項４に係る発明は、既存の中層建築物の基礎の外側に高層建築物用の免震基礎を新たに設け、新たに設けられた免震基礎の上に支持部材を立設し、次いで該支持部材を利用して既存建築物の上方に新たな居住階を形成することにより、中層建築物を高層建築物へと増築する方法であって、前記新たな居住階の完成後に、前記既存の中層建築物について、上層階を解体撤去して残りの各階を順次改装することを特徴とする建築物の耐震補強増築方法に関する。
【０００８】
請求項５に係る発明は、既存の中層建築物の基礎の外側に高層建築物用の免震基礎が設けられ、該免震基礎の上に支持部材が立設され、該支持部材を利用して既存建築物の上方に新たな居住階が形成されてなる建築物であって、前記既存の中層建築物は、地上部の各階が順次されてなるとともに、既存の杭基礎が補強されてなることを特徴とする耐震補強増築建築物に関する。
請求項６に係る発明は、既存の中層建築物の基礎の外側に高層建築物用の免震基礎が設けられ、該免震基礎の上に支持部材が立設され、該支持部材を利用して既存建築物の上方に新たな居住階が形成されてなる建築物であって、前記既存の中層建築物の地上部を解体撤去して形成された空間内にて前記支持部材間に梁を架構することにより２階以上の床が構築され、１階の床は既存の杭基礎の上部に設けられ、形成された各階の床上に新たな居住空間が形成されてなることを特徴とする耐震補強増築建築物に関する。
請求項７に係る発明は、既存の中層建築物の基礎の外側に高層建築物用の免震基礎が設けられ、該免震基礎の上に支持部材が立設され、該支持部材を利用して既存建築物の上方に新たな居住階が形成されてなる建築物であって、前記既存の中層建築物は、上層階が解体撤去されて残りの各階が改装されてなることを特徴とする耐震補強増築建築物に関する。
【０００９】
【発明の実施の形態】
以下、本発明に係る建築物の耐震補強増築方法および耐震補強増築建築物の好適な実施形態について、図面を参照しつつ説明する。
本発明は、新耐震設計法が施工される前の旧耐震基準で設計された３〜５階建ての中層建築物を、新耐震基準を満たす６階建て以上の高層建築物に増築するための方法及びこの方法により得られる高層建築物に関するものである。
本発明が適用される中層建築物の種類は必ずしも限定はされないが、隣接する住戸間に各住戸への出入口に接続する屋外階段を備えた構造を有する、いわゆる階段室型共同住宅が好適であるため、以下の説明では中層建築物が階段室型共同住宅である場合を例に挙げて説明する。
【００１０】
図１乃至図５は本発明に係る建築物の耐震補強増築方法の第一実施形態を施工プロセス順に示す概略縦断面図である。
また、図７は本発明に係る方法の施工前の状態を示す平面図である。尚、図７は１階の平面図を示している。
尚、本実施形態および後述する他の実施形態において、図示例では５階建ての中層建築物を１１階建ての高層建築物に増築する場合を例に挙げているが、中層建築物及び高層建築物の階数が図示例に限定されないことは言うまでもない。
【００１１】
図１及び図７は、本発明に係る方法の施工前の状態である中層建築物（１）を示しており、隣接する住戸（２）の間に、各住戸（２）への出入口（３）に接続する屋外階段（４）を備えた構造の階段室型共同住宅を示している。
本発明に係る方法では、先ずこのような既存の中層建築物の既存基礎の外側に、既存中層建築物の周囲を囲うように、増築のための高層建築物用の免震基礎（５）を設ける（図８参照）。
【００１２】
本発明の全ての実施形態において高層建築物の支持部材（６）を支持する免震基礎（５）としては、公知の免震構造を備えたものを使用することができ、例えば上下一対の接続用金属板と、その間に交互に多数積層されたゴム板及び金属板とからなる積層支持体（いわゆるアイソレータ）や、その積層支持体の内部に粘性流体を封入して粘性流体の変形による減衰効果を持たせたもの等を例示することができる。
【００１３】
そして、該免震基礎（５）の上部に高層建築物の柱となる支持部材（６）を立設し、既存中層建築物（１）の上方においてこれら支持部材（６）間に梁（７）を架設して、梁の上部に屋根及び床を設けることにより、既存中層建築物（１）の上方に新たな居住階（１０）を形成する（図３参照）。
尚、図示例では新たに形成された居住階（１０）のうち、６階を住人全員が自由に使用できる共有スペース（１０ｂ）とし、７階から１１階を住戸スペース（１０ａ）とした例を示している。但し、本発明においては、新たに形成される全ての階を住戸スペースとしてもよい。
【００１４】
このように新たに居住階（１０）が形成された後、既存の中層建築物（１）の住人は新たに形成された居住階（１０）へと移動し、その後、既存の中層建築物（１）の地上部の各階を上層階から順次改装していく（図４参照）。
このとき、既存の中層建築物の居住階層と新たに形成される階層との間に住戸とならない階を設けることによって、工事の騒音が上層階に移住した居住者に伝わりにくく、また工事中の資材置き場や現場事務所として利用することで施工能率を上げることもできる。
これによって、既存の中層建築物（１）の住人は、外部への引越しをする必要がなく、同じ建物に住みながらにして増築を行うことが可能となる。
従って、本発明においては、全ての住人が同一建物内に移住できるように、新たに形成される居住階（１０）の階数は、少なくとも既存の中層建築物（１）の階数以上とすることが好ましい。
【００１５】
既存の中層建築物（１）の地上部の各階の改装は、屋外階段（４）を解体撤去し、撤去した部分に新たな床（８）を延設することにより行われる。
図９は既存の中層建築物の改装後の状態を示す平面図であり、図示の如く、既存の中層建築物は改装によって、水平方向への床の延設がなされるとともに、全ての隣接する住戸（２）に面して各住戸を連絡し且つ両端部に位置する住戸の側方に至る平面視コの字型の廊下（１１）が設けられ、この廊下（１１）に面する外側位置にエレベータ（１２）及び避難階段（１３）が設けられる。
【００１６】
また、新設される廊下（１１）に面する位置には、屋外階段があった位置を挟んで隣接する２つの住戸の玄関（１４）を独立させて設け、この玄関（１４）から廊下（１１）へと直接出られるようにする。
このようにすることによって、火災や地震等の発生時における避難経路が隣接する住戸の住人に別々に確保されて安全性が高くなるとともに、出入りの際に隣りの居住者に気をつかう必要がなくなり、各戸自由に出入りすることが可能となる。
新たに形成された廊下（１１）と、既存の住戸（２）もしくは新たに延設された床（８）との境界は、縁が切れたままの状態としてエキスパンションジョイントで接続する。これによって、廊下（１１）で発生する足音が室内に直接伝わることや、地震の発生時に新設部分の振動が既存住宅部分に伝わることが防がれるため好ましい。尚、平面図において、エキスパンションジョイントで接続される部分を破線円で示している。
【００１７】
本発明に係る第一実施形態の方法は、上記したような既存の中層建築物の地上部を改装する際に、既存の中層建築物を支えていた既存の杭基礎（９）を補強することが大きな特長である。
この杭基礎（９）の補強は、既存杭を抜いたり、別途新たな杭基礎を構築することなく、既存の杭基礎をそのまま埋設した状態で補強するものであり、具体的には図５の円内部分を拡大して示した図６に示すように、既存の杭基礎（９）の周囲及び下方を掘削してフーチング（９ａ）の周囲及び下方に新たにコンクリート（１８）を充填することによりなされる。
これにより、既存杭基礎（９）のフーチング（９ａ）の横断面積が増加し、より大きな荷重を支えることが可能となり、中層建築物（１）の部分の耐震性を向上させることができる。
【００１８】
このように形成された高層建築物は、既存の中層建築物（１）を囲うように増築される部分を支える基礎は免震基礎（５）であり、改装された既存の中層建築物（１）の部分を支える基礎（９）は補強された基礎となるので、新耐震設計法が施工される前の旧耐震基準で設計された中層建築物の増築物であるにも拘らず、全体として新耐震基準を満たし得る６階建て以上の高層建築物となる。
【００１９】
図１０乃至図１２は本発明に係る建築物の耐震補強増築方法の第二実施形態を施工プロセス順に示す概略縦断面図である。
第二実施形態に係る方法の施工プロセスは、上述した第一実施形態の施工プロセスと途中まで同じである。具体的には、段落番号（００１１）〜（００１３）にて説明した第一実施形態の施工プロセス、すなわち、既存の中層建築物の基礎の外側に高層建築物用の免震基礎を新たに設け、該新たに設けられた免震基礎の上に支持部材を立設し、次いで該支持部材を利用して既存建築物の上方に新たな居住階を形成するという一連のプロセスは、第二実施形態にも共通するものである。
従って、第一実施形態と共通する前半の施工プロセスについては図示及び説明を省略し、以下第一実施形態と異なる後半のプロセスについて説明する。
【００２０】
図３に示す如く、既存の中層建築物（１）の上方に新たな居住階（１０）を形成した後、既存の中層建築物（１）の地上部を全て解体撤去する（図１０参照）。
このように既存の中層建築物（１）の解体撤去により形成された空間の周囲には、免震基礎（５）上に立設された支持部材（６）が存在しているので、これらの支持部材（６）間に梁（１６）を架構する（図１１参照）。
そして、梁（１６）の上部に床部材を設けることによって２階以上の床を構築し、１階の床は既存の杭基礎（９）の上部に打設した土間コンクリート上に形成し、各階にそれぞれ居住空間（１５）を形成することにより、図１２に示すような高層建築物が完成する。
【００２１】
このような構造とすることにより、２階以上の部分の荷重は新たに設けられた免震基礎（５）によって支持され、既存の中層建築物（１）の基礎（９）が負担する荷重が大幅に低減される。従って、この第二実施形態の方法によれば、既存の中層建築物（１）が旧耐震基準の建物であっても、既存基礎（９）を補強することなく耐震性を向上させて新耐震基準を満たすことが可能となる。
【００２２】
図１３乃至図１４は本発明に係る建築物の耐震補強増築方法の第三実施形態を施工プロセス順に示す概略縦断面図である。
第三実施形態に係る方法の施工プロセスも、上述した第一実施形態の施工プロセスと途中まで同じである。具体的には、段落番号（００１１）〜（００１３）にて説明した第一実施形態の施工プロセス、すなわち、既存の中層建築物の基礎の外側に高層建築物用の免震基礎を新たに設け、該新たに設けられた免震基礎の上に支持部材を立設し、次いで該支持部材を利用して既存建築物の上方に新たな居住階を形成するという一連のプロセスは、第三実施形態にも共通するものである。
従って、第一実施形態と共通する前半の施工プロセスについては図示及び説明を省略し、以下第一実施形態と異なる後半のプロセスについて説明する。
【００２３】
図３に示す如く、既存の中層建築物（１）の上方に新たな居住階（１０）を形成した後、既存の中層建築物（１）の住人は新たに形成された居住階（１０）へと移動し、その後、既存の中層建築物（１）の上層階のみを解体撤去する（図１３参照）。このとき解体撤去される階数は特に限定されないが、通常は最上階を含む１〜３階分とされる。尚、図示例では２階分（４階と５階）を解体撤去した状態が示されている。
【００２４】
このように、既存の中層建築物（１）の上層階を解体撤去することによって、中層建築物（１）を支える既存基礎（９）の荷重負担が低減され、耐震性を向上させることが可能となる。
【００２５】
次いで、既存の中層建築物（１）のうち、解体撤去されなかった残りの階（図示例では１〜３階）について改装を行って各階に居住空間を形成することにより、施工は完了する（図１４参照）。
この既存の中層建築物（１）の地上部の各階の改装は、屋外階段（４）を解体撤去し、撤去した部分に新たな床（８）を延設することにより行われるものであり、基本的に段落（００１５）〜（００１６）で説明した上記第一実施形態の方法と同じである。
【００２６】
このように形成された高層建築物は、既存の中層建築物（１）を囲うように増築される部分を支える基礎は免震基礎（５）であり、改装された既存の中層建築物（１）の部分を支える基礎（９）は上層階の撤去によって負荷が減少するので、新耐震設計法が施工される前の旧耐震基準で設計された中層建築物の増築物であるにも拘らず、全体として新耐震基準を満たし得る６階建て以上の高層建築物となる。
【００２７】
この第三実施形態に係る方法により得られる高層建築物では、図１４に示すように、撤去された中層建築物の階の部分（図示例では４階と５階）に吹き抜けの空間（１７）が形成されるので、この空間を緑化庭園などの居住者の共通スペースとして利用することができる。
【００２８】
【発明の効果】
以上説明したように、本発明に係る建築物の耐震補強増築方法および耐震補強増築建築物によれば、階段室型共同住宅等の中層建築物を居住者が住みながらにして高層建築物に増築することができるとともに、増築に伴って旧耐震基準で設計された既存建築物を新耐震基準を満たし得る高層建築物へと生まれ変わらせることが可能となる。
【図面の簡単な説明】
【図１】本発明に係る建築物の耐震補強増築方法の第一実施形態を施工プロセス順に示す概略縦断面図である。
【図２】本発明に係る建築物の耐震補強増築方法の第一実施形態を施工プロセス順に示す概略縦断面図である。
【図３】本発明に係る建築物の耐震補強増築方法の第一実施形態を施工プロセス順に示す概略縦断面図である。
【図４】本発明に係る建築物の耐震補強増築方法の第一実施形態を施工プロセス順に示す概略縦断面図である。
【図５】本発明に係る建築物の耐震補強増築方法の第一実施形態を施工プロセス順に示す概略縦断面図である。
【図６】本発明に係る建築物の耐震補強増築方法の第一実施形態における既存杭の補強方法を示す概略縦断面図である。
【図７】本発明に係る方法の施工前の状態を示す平面図である。
【図８】本発明に係る建築物の耐震補強増築方法の施工プロセスの途中段階を示す平面図である。
【図９】既存の中層建築物の改装後の状態を示す平面図である。
【図１０】本発明に係る建築物の耐震補強増築方法の第二実施形態を施工プロセス順に示す概略縦断面図である。
【図１１】本発明に係る建築物の耐震補強増築方法の第二実施形態を施工プロセス順に示す概略縦断面図である。
【図１２】本発明に係る建築物の耐震補強増築方法の第二実施形態を施工プロセス順に示す概略縦断面図である。
【図１３】本発明に係る建築物の耐震補強増築方法の第三実施形態を施工プロセス順に示す概略縦断面図である。
【図１４】本発明に係る建築物の耐震補強増築方法の第三実施形態を施工プロセス順に示す概略縦断面図である。
【符号の説明】
１中層建築物
２住戸
３出入口
４屋外階段
５免震基礎
６支持部材
７梁
８新たな床
９既存の杭基礎
９ａ既存の杭基礎のフーチング
１０新たな居住階
１１新たな廊下
１２エレベータ
１３避難階段
１４新たな玄関
１５新たな居住空間
１６梁
１７吹き抜けの空間
１８補強用コンクリート[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method and an additional building for seismic reinforcement of a building, and more particularly to a seismic reinforcement of a building capable of expanding a middle-rise building such as a staircase type apartment house into a high-rise building having excellent earthquake resistance. The present invention relates to a reinforcement extension method and an earthquake-resistant reinforcement extension building.
[0002]
[Prior art]
Between 1960 and 1970, a number of middle-rise apartment buildings were constructed in Japan in order to respond to the rapid population growth near urban areas.
Many of such apartment houses are so-called staircase-type apartment houses having a structure having an outdoor staircase connected between adjacent dwelling units at an entrance to each dwelling unit.
In general, residents of such staircase type apartments tend to be elderly, so it is difficult for residents on upper floors to climb up and down stairs. Renovation is desired.
However, dismantling and rebuilding existing staircase-type apartments involves a number of issues that must be addressed, including the generation of enormous amounts of building debris, large construction costs, and moving residents due to rebuilding. is there.
[0003]
In view of this problem, there has been proposed a method of remodeling an existing staircase-type apartment house into a single-hall type apartment house (see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-11-159153
[Problems to be solved by the invention]
The disclosed technology of Patent Document 1 is excellent in that an existing elevator can be installed by renovating an existing staircase-type apartment house into a one-hall corridor type apartment house while a resident lives. Met.
However, many of the conventional staircase-type apartment houses are structurally designed based on the old seismic standards and have problems in seismic resistance. However, the technology of Patent Document 1 does not consider such seismic problems at all. Did not.
In some cases, there is a demand for increasing the number of living spaces (the number of dwelling units) at the time of remodeling. However, the technology disclosed in Patent Document 1 cannot meet such a demand.
[0006]
The present invention has been made in order to solve the above-described problems of the conventional technology, and it is possible to add a middle-rise building such as a staircase-type apartment house to a high-rise building while a resident lives. Along with the expansion, we will provide an earthquake-resistant reinforcement expansion method and an earthquake-resistant reinforcement expansion building that can convert an existing building designed with the old earthquake resistance standard into a high-rise building that meets the new earthquake resistance standard. Things.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 provides a new seismic isolation foundation for a high-rise building outside the foundation of an existing middle-rise building, and establishes a support member on the newly provided seismic isolation foundation. A method of expanding a middle-rise building to a high-rise building by forming a new living floor above an existing building using the support member, wherein after the completion of the new living floor, The present invention relates to a seismic retrofitting extension method for a middle-rise building, characterized by sequentially renovating each floor above the ground and reinforcing an existing pile foundation.
The invention according to claim 2 is characterized in that the reinforcing of the existing pile foundation increases the cross-sectional area of the footing by excavating around the existing pile foundation and filling concrete around the footing. The present invention relates to a method for adding and reinforcing seismic reinforcement of a building according to claim 1.
The invention according to claim 3 newly provides a seismic isolation foundation for a high-rise building outside the foundation of an existing middle-rise building, and establishes a support member on the newly provided seismic isolation foundation. Next, a method of expanding a middle-rise building to a high-rise building by forming a new living floor above the existing building using the supporting member, wherein after the completion of the new living floor, The above-ground part of the existing middle-rise building is dismantled and removed, and a beam is erected between the support members in the space formed thereby to construct a floor of two or more floors. The present invention relates to a seismic retrofit expansion method for a building, which is provided on an upper part of a foundation and forms a new living space on a floor of each floor formed thereafter.
The invention according to claim 4 provides a new seismic isolation base for a high-rise building outside the foundation of an existing middle-rise building, and establishes a support member on the newly provided seismic isolation foundation. A method of expanding a middle-rise building to a high-rise building by forming a new living floor above an existing building using the support member, wherein after the completion of the new living floor, The present invention relates to a seismic retrofitting extension method for a middle-rise building, characterized in that the upper floor is demolished and removed, and the remaining floors are sequentially renovated.
[0008]
In the invention according to claim 5, a seismic isolation base for a high-rise building is provided outside the foundation of an existing middle-rise building, a support member is erected on the seismic isolation base, and the support member is used. And a new residential floor is formed above the existing building, and the existing middle-rise building is formed by sequentially arranging each floor of the above ground part and reinforcing the existing pile foundation. The present invention relates to a seismic retrofitted extension building.
In the invention according to claim 6, a seismic isolation base for a high-rise building is provided outside a foundation of an existing middle-rise building, a support member is erected on the seismic isolation foundation, and the support member is used. A new living floor is formed above the existing building, and a beam is provided between the support members in a space formed by dismantling and removing the above-ground part of the existing middle-rise building. The seismic resistance is characterized by the fact that the floor of the second floor or more is constructed by framing, the floor of the first floor is provided on top of the existing pile foundation, and a new living space is formed on the floor of each floor formed. Reinforced extension buildings.
In the invention according to claim 7, a seismic isolation base for a high-rise building is provided outside the foundation of an existing middle-rise building, a support member is erected on the seismic isolation foundation, and the support member is used. And a new residential floor is formed above the existing building. The existing middle-rise building is characterized in that the upper floor is dismantled and removed and the remaining floors are renovated. It relates to an earthquake-resistant reinforcement extension building.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a seismic retrofitting extension building and a seismic retrofitting extension building according to the present invention will be described below with reference to the drawings.
The present invention is for expanding a three- to five-story middle-rise building designed based on the old seismic standards before the new seismic design method is implemented to a six-story or higher-rise building that meets the new seismic standards. The present invention relates to a method and a high-rise building obtained by this method.
The type of middle-rise building to which the present invention is applied is not necessarily limited, but a so-called staircase-type apartment house having a structure having an outdoor staircase connected to an entrance to each dwelling unit between adjacent dwelling units is preferable. Therefore, in the following description, a case where the middle-rise building is a staircase-type apartment house will be described as an example.
[0010]
FIGS. 1 to 5 are schematic longitudinal sectional views showing a first embodiment of a seismic retrofitting extension method for a building according to the present invention in the order of construction process.
FIG. 7 is a plan view showing a state before construction of the method according to the present invention. FIG. 7 is a plan view of the first floor.
In this embodiment and other embodiments to be described later, in the illustrated example, a case where a 5-story middle-rise building is expanded to an 11-story high-rise building is taken as an example. It goes without saying that the floor number of the object is not limited to the illustrated example.
[0011]
1 and 7 show a middle-rise building (1) in a state before construction of the method according to the present invention, and an entrance (3) to each dwelling unit (2) between adjacent dwelling units (2). 3) shows a staircase-type apartment house having a structure provided with an outdoor staircase (4) connected to the same.
In the method according to the present invention, a seismic isolation foundation (5) for a high-rise building for extension is first provided outside the existing foundation of such an existing middle-rise building so as to surround the existing middle-rise building. (See FIG. 8).
[0012]
In all the embodiments of the present invention, as a seismic isolation base (5) for supporting a support member (6) of a high-rise building, a base having a known seismic isolation structure can be used. Support (so-called isolator) consisting of a metal plate for use and a rubber plate and a metal plate alternately stacked in between, and a damping effect due to the deformation of the viscous fluid by sealing the viscous fluid inside the laminate support And the like.
[0013]
Then, a support member (6) serving as a pillar of a high-rise building is erected on the upper part of the seismic isolation base (5), and a beam (7) is provided between these support members (6) above the existing middle-rise building (1). ), And a roof and a floor are provided above the beams to form a new living floor (10) above the existing middle-rise building (1) (see FIG. 3).
In the illustrated example, among the newly formed living floors (10), the sixth floor is a shared space (10b) that can be used freely by all residents, and the seventh to eleventh floors are dwelling unit spaces (10a). Is shown. However, in the present invention, all newly formed floors may be used as dwelling unit spaces.
[0014]
After the new residential floor (10) is thus formed, the residents of the existing middle-rise building (1) move to the newly formed residential floor (10), and then the existing middle-rise building (1) Each floor of the above ground part of 1) is renovated sequentially from the upper floor (see FIG. 4).
At this time, by providing a floor that does not become a dwelling unit between the living level of the existing middle-rise building and the newly formed level, it is difficult for construction noise to be transmitted to residents who have moved to the upper floors. The construction efficiency can be improved by using it as a material storage place or a site office.
As a result, the resident of the existing middle-rise building (1) does not need to move outside, and can make an extension while living in the same building.
Therefore, in the present invention, the floor of the newly formed living floor (10) should be at least the floor of the existing middle-rise building (1) so that all residents can move into the same building. preferable.
[0015]
The renovation of each floor above the existing middle-rise building (1) is performed by dismantling and removing the outdoor stairs (4) and extending a new floor (8) to the removed portion.
FIG. 9 is a plan view showing the state of the existing middle-rise building after renovation. As shown in the drawing, the existing middle-rise building has a floor extending in the horizontal direction due to the renovation, and all of the adjacent middle-rise buildings are adjacent to each other. A U-shaped corridor (11) is provided to connect the dwelling units facing the dwelling unit (2) and reach the sides of the dwelling unit located at both ends, and an outer position facing this corridor (11) is provided. , An elevator (12) and an evacuation stair (13) are provided.
[0016]
Further, at the position facing the newly established corridor (11), the entrances (14) of the two dwelling units adjacent to each other across the position where the outdoor stairs were located are provided independently, and the corridor (11) is provided from the entrance (14). ).
In this way, evacuation routes in the event of a fire, earthquake, etc. are secured separately for residents of adjacent dwelling units to increase safety, and it is necessary to pay attention to neighbors when entering and exiting. It is possible for each house to enter and leave freely.
The boundary between the newly formed corridor (11) and the existing dwelling unit (2) or the newly extended floor (8) is connected by an expansion joint with the edge being cut off. This is preferable because footsteps generated in the corridor (11) can be prevented from being directly transmitted to the room, and the vibration of the newly-installed portion can be prevented from being transmitted to the existing house portion when an earthquake occurs. In the plan view, portions connected by the expansion joint are indicated by broken-line circles.
[0017]
The method of the first embodiment according to the present invention reinforces an existing pile foundation (9) supporting an existing middle-rise building when renovating the above-ground portion of the existing middle-rise building as described above. Is a great feature.
The reinforcement of the pile foundation (9) is to reinforce the existing pile foundation as it is, without pulling out the existing pile or constructing a new pile foundation separately. Specifically, FIG. Excavation around and below the existing pile foundation (9), as shown in Fig. 6 showing an enlarged portion within the circle, and filling around the footing (9a) and below with fresh concrete (18). Made by
As a result, the cross-sectional area of the footing (9a) of the existing pile foundation (9) increases, it is possible to support a larger load, and it is possible to improve the earthquake resistance of the middle-rise building (1).
[0018]
In the high-rise building thus formed, the base supporting the part to be extended so as to surround the existing middle-rise building (1) is a base isolation base (5), and the renovated existing middle-rise building (1) Since the foundation (9) supporting the part of ()) is a reinforced foundation, it is an extension of a middle-rise building designed according to the old seismic standards before the new seismic design method was implemented, but as a whole It will be a high-rise building of 6 stories or more that can meet the new seismic standards.
[0019]
FIGS. 10 to 12 are schematic longitudinal sectional views showing a second embodiment of the seismic retrofitting extension method for a building according to the present invention in the order of the construction process.
The construction process of the method according to the second embodiment is partially the same as the construction process of the first embodiment described above. Specifically, the construction process of the first embodiment described in paragraph numbers (0011) to (0013), that is, a seismic isolation foundation for a high-rise building is newly provided outside the foundation of an existing middle-rise building A series of processes of erecting a supporting member on the newly provided seismic isolation base and then forming a new living floor above the existing building using the supporting member is a second process. It is common to the forms.
Therefore, illustration and description of the first half construction process common to the first embodiment are omitted, and the second half process different from the first embodiment will be described below.
[0020]
As shown in FIG. 3, after forming a new residential floor (10) above the existing middle-rise building (1), all the ground parts of the existing middle-rise building (1) are dismantled and removed (see FIG. 10). .
The support member (6) erected on the seismic isolation base (5) exists around the space formed by dismantling and removing the existing middle-rise building (1) in this manner. A beam (16) is framed between the support members (6) (see FIG. 11).
Then, a floor member on the second floor or more is constructed by providing a floor member on the upper part of the beam (16), and the floor on the first floor is formed on the concrete between the floors cast on the upper part of the existing pile foundation (9). A high-rise building as shown in FIG. 12 is completed by forming a living space (15) in each.
[0021]
By adopting such a structure, the load on the second floor or higher is supported by the newly provided seismic isolation foundation (5), and the load borne by the foundation (9) of the existing middle-rise building (1) is reduced. It is greatly reduced. Therefore, according to the method of the second embodiment, even if the existing middle-rise building (1) is a building of the old seismic standard, the seismic resistance is improved without reinforcing the existing foundation (9) and the new seismic It is possible to meet the standards.
[0022]
FIGS. 13 and 14 are schematic longitudinal sectional views showing a third embodiment of the seismic retrofitting extension method for a building according to the present invention in the order of the construction process.
The construction process of the method according to the third embodiment is also partially the same as the construction process of the above-described first embodiment. Specifically, the construction process of the first embodiment described in paragraph numbers (0011) to (0013), that is, a seismic isolation foundation for a high-rise building is newly provided outside the foundation of an existing middle-rise building A series of processes of erecting a supporting member on the newly provided seismic isolation foundation and then forming a new living floor above the existing building using the supporting member is a third implementation. It is common to the forms.
Therefore, illustration and description of the first half construction process common to the first embodiment are omitted, and the second half process different from the first embodiment will be described below.
[0023]
As shown in FIG. 3, after forming a new living floor (10) above the existing middle-rise building (1), the residents of the existing middle-rise building (1) are moved to the newly formed living floor (10). Then, only the upper floor of the existing middle-rise building (1) is dismantled and removed (see FIG. 13). At this time, the number of floors to be dismantled and removed is not particularly limited, but is usually one to three floors including the top floor. In the illustrated example, a state in which two floors (fourth floor and fifth floor) are dismantled and removed is shown.
[0024]
In this way, by dismantling and removing the upper floor of the existing middle-rise building (1), the load-bearing of the existing foundation (9) that supports the middle-rise building (1) is reduced, and seismic resistance can be improved. It becomes.
[0025]
Next, of the existing middle-rise building (1), the remaining floors (1 to 3 floors in the illustrated example) that have not been demolished are renovated to form a living space on each floor, thereby completing the construction ( See FIG. 14).
The renovation of each floor above the existing middle-rise building (1) is performed by dismantling and removing the outdoor stairs (4) and extending a new floor (8) to the removed part. This is basically the same as the method of the first embodiment described in paragraphs (0015) to (0016).
[0026]
In the high-rise building thus formed, the base supporting the part to be extended so as to surround the existing middle-rise building (1) is a base isolation base (5), and the renovated existing middle-rise building (1) Since the load on the foundation (9) supporting the section (9) is reduced by removing the upper floors, it is an extension of a middle-rise building designed according to the old seismic standards before the new seismic design method was implemented. As a whole, it will be a high-rise building with more than 6 stories that can meet the new seismic standards.
[0027]
In the high-rise building obtained by the method according to the third embodiment, as shown in FIG. 14, a space (17) of a stairwell is provided at a floor portion (fourth and fifth floors in the illustrated example) of the removed middle-rise building. This space can be used as a common space for residents such as a green garden.
[0028]
【The invention's effect】
As described above, according to the seismic retrofitting extension method for a building and the seismic retrofitting extension building according to the present invention, a middle-rise building such as a staircase-type apartment house is added to a high-rise building while a resident lives. In addition to the expansion, existing buildings designed with the old seismic standards can be reborn as high-rise buildings that can meet the new seismic standards.
[Brief description of the drawings]
FIG. 1 is a schematic vertical sectional view showing a first embodiment of a method for adding and reinforcing a building according to the present invention in the order of construction process.
FIG. 2 is a schematic longitudinal sectional view showing a first embodiment of a method for adding and reinforcing seismic reinforcement of a building according to the present invention in the order of construction process.
FIG. 3 is a schematic longitudinal sectional view showing a first embodiment of a method for adding and reinforcing seismic reinforcement of a building according to the present invention in the order of construction process.
FIG. 4 is a schematic longitudinal sectional view showing a first embodiment of a method for adding and reinforcing seismic reinforcement of a building according to the present invention in the order of construction process.
FIG. 5 is a schematic longitudinal sectional view showing a first embodiment of a method for adding a seismic reinforcement of a building according to the present invention in the order of construction process.
FIG. 6 is a schematic longitudinal sectional view showing a method for reinforcing an existing pile in the first embodiment of the method for reinforcing a building for earthquake resistance according to the present invention.
FIG. 7 is a plan view showing a state before construction of the method according to the present invention.
FIG. 8 is a plan view showing an intermediate stage of a construction process of the method for adding a seismic reinforcement of a building according to the present invention.
FIG. 9 is a plan view showing a state after renovation of an existing middle-rise building.
FIG. 10 is a schematic longitudinal sectional view showing a second embodiment of a method for adding and reinforcing seismic reinforcement of a building according to the present invention in the order of construction process.
FIG. 11 is a schematic longitudinal sectional view showing a second embodiment of the method for adding a seismic reinforcement of a building according to the present invention in the order of construction process.
FIG. 12 is a schematic vertical sectional view showing a second embodiment of the method for adding and reinforcing a building according to the present invention in the order of construction process.
FIG. 13 is a schematic longitudinal sectional view showing a third embodiment of a method for adding a seismic reinforcement of a building according to the present invention in the order of construction process.
FIG. 14 is a schematic longitudinal sectional view showing a third embodiment of a method for adding and reinforcing a building according to the present invention in the order of construction process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Middle-rise building 2 Dwelling unit 3 Entrance 4 Outdoor stairs 5 Seismic isolation foundation 6 Support member 7 Beam 8 New floor 9 Existing pile foundation 9a Footing of existing pile foundation 10 New living floor 11 New hallway 12 Elevator 13 Evacuation stairs 14 New entrance 15 New living space 16 Beam 17 Ventilation space 18 Reinforcement concrete

Claims

A new seismic isolation base for high-rise buildings is provided outside the foundation of the existing middle-rise building, and a support member is erected on the newly provided seismic isolation foundation. A method for expanding a middle-rise building to a high-rise building by forming a new living floor above a building, wherein after the completion of the new living-floor, the existing middle-rise building has a ground section. A method of building seismic retrofitting, characterized by sequentially renovating each floor and reinforcing existing pile foundations.

The building of claim 1, wherein the reinforcing of the existing pile foundation increases the cross-sectional area of the footing by excavating around the existing pile foundation and filling concrete around the footing. Seismic reinforcement extension method.

A new seismic isolation foundation for a high-rise building is provided outside the foundation of an existing middle-rise building, a support member is erected on the newly provided seismic isolation foundation, and then the support member is used. A method for expanding a middle-rise building to a high-rise building by forming a new living floor above an existing building, wherein after the completion of the new living-floor, a ground portion of the existing middle-rise building Is dismantled and removed, and a beam is erected between the support members in the space formed to construct a floor of two or more floors, and then the floor of the first floor is provided on top of the existing pile foundation, and thereafter A seismic retrofit expansion method for a building characterized by forming a new living space on the floor of each floor formed.

A new seismic isolation base for high-rise buildings is provided outside the foundation of the existing middle-rise building, and a support member is erected on the newly provided seismic isolation foundation. A method of expanding a middle-rise building to a high-rise building by forming a new living floor above a building, wherein after the completion of the new living-floor, the existing middle-rise building is an upper floor. And dismantling and renovating the remaining floors one after another.

A seismic isolation foundation for a high-rise building is provided outside the foundation of an existing middle-rise building, and a support member is erected on the seismic isolation foundation, and a new member is provided above the existing building using the support member. And an existing middle-rise building, wherein each floor of the above-ground portion is sequentially arranged and an existing pile foundation is reinforced. Building.

A seismic isolation foundation for a high-rise building is provided outside the foundation of an existing middle-rise building, and a support member is erected on the seismic isolation foundation, and a new member is provided above the existing building using the support member. A living floor is formed, and a beam is provided between the support members in a space formed by dismantling and removing the above-ground part of the existing middle-rise building. A seismic retrofit building, wherein a floor is constructed, a floor on the first floor is provided on an existing pile foundation, and a new living space is formed on the floor on each floor.

A seismic isolation foundation for a high-rise building is provided outside the foundation of an existing middle-rise building, and a support member is erected on the seismic isolation foundation, and a new member is provided above the existing building using the support member. An existing middle-rise building, wherein an upper floor is dismantled and removed and each of the remaining floors is renovated.