JP4228308B2 - Reinforcement method for existing floors and seismic isolation method for existing buildings - Google Patents

Reinforcement method for existing floors and seismic isolation method for existing buildings Download PDF

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JP4228308B2
JP4228308B2 JP2004179526A JP2004179526A JP4228308B2 JP 4228308 B2 JP4228308 B2 JP 4228308B2 JP 2004179526 A JP2004179526 A JP 2004179526A JP 2004179526 A JP2004179526 A JP 2004179526A JP 4228308 B2 JP4228308 B2 JP 4228308B2
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floor
seismic isolation
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reinforcing
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JP2006002428A (en
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義人 本多
泰造 川端
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Shimizu Corp
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Description

本発明は、最下階の床が土間コンクリートにより形成されている既存建物を対象として、その既存建物における土間コンクリートの既存床を補強するための補強工法、およびその既存建物全体を免震建物に改修するための免震化工法に関する。   The present invention is directed to an existing building in which the floor of the lowermost floor is formed of soil-concrete, a reinforcement method for reinforcing the existing floor of soil-concrete in the existing building, and the entire existing building as a seismic isolation building It relates to the seismic isolation method for repair.

老朽化した既存建物を補強し免震化するための工法として、たとえば特許文献１に示されるものが提案されている。これは煉瓦造や石造等の組積造による歴史的建造物を対象とするもので、既存基礎の周囲にコンクリートを増し打ちして緊張材により一体化せしめることで基礎を補強することを主眼とし、そのようにして補強した基礎を積層ゴム等の免震装置により支持することで既存建物全体を免震化するというものである。
特開平１１−１４８２３１号公報 As a construction method for reinforcing an old building and making it seismic isolation, for example, one disclosed in Patent Document 1 has been proposed. This is intended for historical buildings such as masonry such as bricks and stones, and the main purpose is to reinforce the foundation by adding concrete around the existing foundation and integrating it with a tension material. The existing building is seismically isolated by supporting the reinforced foundation with a seismic isolation device such as laminated rubber.
JP-A-11-148231

ところで、過去に建造された建物では最下階（接地階）の床が構造スラブではなく単なる土間コンクリートにより形成されている場合も多く、特許文献１に示されるような工法で免震化する際にはそのような土間コンクリートの強度が問題となる場合が多いことから、そのような場合には土間コンクリートを解体して新たに構造スラブを施工して床面での水平剛性を確保することが従来一般的である。   By the way, in the building constructed in the past, the floor of the lowest floor (grounding floor) is often formed not by structural slab but by simple soil concrete. In such cases, the strength of such concrete is often a problem. In such cases, it is necessary to dismantle the concrete and construct a new structural slab to ensure horizontal rigidity on the floor. Conventionally common.

一方、既存建物を補強したり改修する場合には、その建物をそのまま使用しながら工事を行いたいという要請も多いが、上記のように既存の土間コンクリートを解体して新たに構造スラブを施工することでは当然に建物を使用しながらの工事は不可能であり、そのような要請には応じられないものであった。   On the other hand, when reinforcing or refurbishing an existing building, there are many requests to perform the construction while using the building as it is, but dismantling the existing soil concrete and constructing a new structural slab as described above Of course, construction using the building was impossible, and such a request could not be met.

上記事情に鑑み、本発明は既存建物を使用しながらでも既存床としての土間コンクリートを補強することのできる有効適切な補強工法、およびその既存建物を使用しながらでも免震化することのできる有効適切な免震化工法を提供することを目的としている。   In view of the above circumstances, the present invention is an effective and effective reinforcement method that can reinforce the soil concrete as an existing floor even while using an existing building, and an effective seismic isolation even while using the existing building. The purpose is to provide an appropriate seismic isolation method.

請求項１の発明は、既存建物の最下階に土間コンクリートにより形成されている既存床を補強するための補強工法であって、既存床である土間コンクリートの支持地盤を溝状に掘削し、その掘削溝に設置した支柱により根太を介して既存床を支持しつつ掘削溝を周囲に拡大しては支柱を周囲に増設していって既存床の下方に作業空間を確保し、その作業空間内での作業により既存基礎の周囲に補強基礎を一体に設けるとともに、前記既存床の下面側にそれを支持する補強構造体としての構造スラブを前記補強基礎により支持して該補強基礎間に形成して、既存床を支持していた根太をその構造スラブ中に埋設して残置することを特徴とする。 The invention of claim 1 is a reinforcing method for reinforcing an existing floor formed of soil concrete on the lowest floor of an existing building, excavating a support ground of the soil concrete that is the existing floor into a groove shape, While supporting the existing floor via joists using the pillars installed in the excavation groove, the excavation groove is expanded to the surroundings, and the work space is secured below the existing floor by expanding the pillars around it. A reinforcing foundation is integrally provided around the existing foundation by the work inside, and a structural slab as a reinforcing structure supporting the existing floor is supported on the lower surface side of the existing floor by the reinforcing foundation and formed between the reinforcing foundations. Then, the joist supporting the existing floor is buried and left in the structural slab .

請求項２の発明は、最下階の床が土間コンクリートにより形成されている既存建物を対象として免震建物に改修するための免震化工法であって、請求項１記載の補強工法によって土間コンクリートの既存床を補強するとともに補強構造体としての構造スラブによって最下階での水平剛性を確保し、作業空間での作業によって既存基礎および補強基礎の下方をさらに掘削してそこに免震装置を設置し、既存建物全体を免震装置により免震支持するとともに作業空間を免震ピットとして残置することを特徴とする。 A second aspect of the present invention, a seismic sinkers method for lowest floor of the bed to repair the seismic isolation building as for existing buildings that are formed by the earth floor concrete, earth floor by the reinforcing method according to claim 1, wherein Reinforce the existing concrete floor and secure horizontal rigidity at the lowest floor by the structural slab as a reinforcing structure, and further excavate the existing foundation and the reinforcement foundation below by working in the work space, and seismic isolation device there The seismic isolation device supports the entire existing building and the work space remains as a seismic isolation pit.

本発明の既存床の補強工法によれば、既存床としての土間コンクリートの支持地盤を掘削してその下方に作業空間を確保し、その作業空間内での作業によって既存床を下面側から支持する補強構造体としての構造スラブを施工するので、既存床を解体撤去することなくそれを有効に補強してそのまま残置できるし、そのような工事を既存建物を使用しながら実施することが可能となる。その際、作業空間での作業により既存基礎に対する補強も行うので、基礎補強も建物を使用しながら行うことが可能である。 According to the reinforcement method of the existing floor of the present invention, excavating the supporting ground of soil concrete as the existing floor to secure a work space below it, and supporting the existing floor from the lower surface side by work in the work space Since the structural slab is constructed as a reinforced structure, the existing floor can be effectively reinforced and left without being dismantled, and such construction can be carried out while using the existing building. . At that time, since the existing foundation is reinforced by the work in the work space, the foundation can be reinforced while using the building.

また、土間コンクリートを支持する補強構造体として構造スラブを採用してそれを土間コンクリートの下面側に形成することにより、その構造スラブによって根太を介して土間コンクリートを支持して優れた補強効果が得られるし、根太をそのまま構造スラブ中に埋設して残置するので施工性にも優れる。 Also, by adopting a structural slab as the reinforcing structure that supports the soil concrete and forming it on the lower surface side of the soil concrete, the structural slab supports the soil concrete through the joists and has an excellent reinforcing effect. In addition, the joist is buried in the structural slab as it is and left, so it is excellent in workability .

本発明の免震化工法によれば、上記の補強工法により既存建物を使用しながら既存床の下方に設けた作業空間での作業により既存床および既存基礎を補強して最下階での水平剛性を確保でき、かつ同じく作業空間での作業によって免震装置を設置して建物全体を免震支持することにより、既存建物を使用しながらそれを免震化することができるし、作業空間を残置してそのまま免震ピットとして利用できるので合理的である。 According to seismic sinker method of the present invention, the horizontal at the lowest floor to reinforce the existing floor and existing foundation by working in the work space provided below the existing floor while using existing buildings by the reinforcing method of the By installing seismic isolation devices and supporting the entire building with seismic isolation by working in the work space, it is possible to make it seismically isolated while using an existing building. It is reasonable because it can be left and used as a seismic isolation pit.

本発明の補強工法の一実施形態を図１〜図４に示す。図１は補強対象である老朽化した煉瓦造の既存建物の最下階（地上１階）を示すものであって、この既存建物の既存基礎１は無筋コンクリート２上に煉瓦を積み上げた構造とされ、最下階の既存床３は支持地盤４上に土間コンクリートとして直接形成したものとなっている。本実施形態ではこの既存建物を使用しながら既存基礎１および既存床３を補強するべく、以下の工法を採用する。   One embodiment of the reinforcing method of the present invention is shown in FIGS. Fig. 1 shows the lowest floor (the first floor above ground) of an old brick building to be reinforced, and the existing foundation 1 of this existing building is a structure in which bricks are stacked on unreinforced concrete 2 The existing floor 3 on the lowest floor is formed directly on the supporting ground 4 as soil concrete. In this embodiment, the following construction method is adopted to reinforce the existing foundation 1 and the existing floor 3 while using this existing building.

まず、図２に示すように適宜位置に設けた開口部（図示せず）から既存基礎１の周囲を溝状に掘削して掘削溝５を形成する。その際、掘削溝５の形成によりその部分では既存床３（土間コンクリート）に対する支持力が失われるので、掘削溝５の溝幅は既存床３に悪影響が及ばない程度に制限し、それを越える場合には支柱６を設けてその支柱６により根太７を介して既存床３を支持する。   First, as shown in FIG. 2, an excavation groove 5 is formed by excavating the periphery of the existing foundation 1 into a groove shape from an opening (not shown) provided at an appropriate position. At this time, since the support force for the existing floor 3 (concrete concrete) is lost in the portion due to the formation of the excavation groove 5, the groove width of the excavation groove 5 is limited to the extent that the existing floor 3 is not adversely affected and exceeds that In this case, the support 6 is provided and the existing floor 3 is supported by the support 6 via the joist 7.

図３に示すように、そのような支柱６を所定ピッチで設置していって既存床３を支持しながら掘削溝５を周囲に漸次拡大していくことにより、支持地盤４を掘削して既存床３全体の下方に作業空間８を確保し、以降はその作業空間８での作業により既存基礎１の補強と既存床３の補強を行う。   As shown in FIG. 3, the supporting ground 4 is excavated by gradually expanding the excavation groove 5 around the support floor 4 while supporting the existing floor 3 by installing such columns 6 at a predetermined pitch. A work space 8 is secured below the entire floor 3, and thereafter, the existing foundation 1 and the existing floor 3 are reinforced by work in the work space 8.

すなわち、図４に示すように既存基礎１の両側に鉄筋コンクリート造の補強基礎９を設け、それら補強基礎９と既存基礎１とを貫通するように緊張材１０を設け、その緊張材１０を緊張して定着することで補強基礎９を既存基礎１に緊結して一体化することにより既存基礎１を補強する。そのような既存基礎１に対する補強工法としては上述した特許文献１に示されている工法が好適に採用可能である。   That is, as shown in FIG. 4, reinforced concrete reinforcement foundations 9 are provided on both sides of the existing foundation 1, tension members 10 are provided so as to penetrate the reinforcement foundation 9 and the existing foundation 1, and the tension members 10 are tensioned. The existing foundation 1 is reinforced by tightening and integrating the reinforcing foundation 9 with the existing foundation 1. As such a reinforcing method for the existing foundation 1, the method described in Patent Document 1 described above can be suitably employed.

そして同じく図４に示しているように、補強基礎９の上部に鉄筋コンクリート造の構造スラブ１１を一体に設けることにより、その構造スラブ１１を既存床３の下面側に形成する。構造スラブ１１は補強基礎９により支持されてそれら補強基礎９間に設けられることで既存床３を支持するための補強構造体として機能し、同時にこの既存建物の１階床面レベルにおける水平剛性を確保するためのものであり、そのような機能を発揮し得るように強度や版厚を設計すれば良い。なお、構造スラブ１１の施工に際しては根太７はそのまま構造スラブ１１内に埋め殺してしまって構造スラブ１１に対して固定することにより、新設した構造スラブ１１を既存床３の下面に密着させずとも根太７を介して既存床３を確実に支持することができる。支柱６は補強構造体の一部としてそのまま残置することでも良いが、後述するように免震化するような場合には後段で撤去すれば良い。   Then, similarly as shown in FIG. 4, the structural slab 11 made of reinforced concrete is integrally provided on the upper portion of the reinforcing foundation 9, so that the structural slab 11 is formed on the lower surface side of the existing floor 3. The structural slab 11 is supported by the reinforcing foundation 9 and is provided between the reinforcing foundations 9 to function as a reinforcing structure for supporting the existing floor 3, and at the same time, the horizontal rigidity at the first floor level of the existing building is increased. The strength and the plate thickness may be designed so that such functions can be exhibited. In the construction of the structural slab 11, the joist 7 is buried in the structural slab 11 as it is and fixed to the structural slab 11, so that the newly constructed structural slab 11 does not adhere to the lower surface of the existing floor 3. The existing floor 3 can be reliably supported through the joists 7. The support column 6 may be left as it is as a part of the reinforcing structure, but it may be removed later in the case of seismic isolation as will be described later.

上記の補強工法によれば、既存床３としての土間コンクリートの支持地盤４を掘削してそこに作業空間８を確保し、そこからの作業のみで既存床３に対する補強を行うことが可能であることから、従来のように土間コンクリートとしての既存床３を解体することなくそれをそのまま残置することが可能となり、したがって既存建物を使用しながらでも補強工事を支障なく実施することが可能となり、補強工事の工期短縮と工費削減を実現することが可能である。   According to the above-described reinforcement method, it is possible to excavate the supporting ground 4 of the soil concrete as the existing floor 3 to secure the work space 8 there, and to reinforce the existing floor 3 only by the work from there. Therefore, it is possible to leave the existing floor 3 as soil concrete without dismantling it as before, so that it is possible to carry out the reinforcement work without any trouble even while using the existing building. It is possible to reduce the construction period and cost.

以上で本発明の補強工法の実施形態を説明したが、次に本発明の免震化工法の実施形態を図５を参照して説明する。本実施形態の免震化工法は、上記の補強工法によって図１〜図４に示したように既存基礎１および既存床３に対して補強を行った後、同じく作業空間８での作業によって免震装置１７を設置して既存建物全体を免震化するものである。 The embodiment of the reinforcing method of the present invention has been described above. Next, the embodiment of the seismic isolation method of the present invention will be described with reference to FIG . The seismic isolation method according to the present embodiment is relieved by the work in the work space 8 after reinforcing the existing foundation 1 and the existing floor 3 as shown in FIGS . The seismic device 17 is installed to make the existing building seismic isolation.

すなわち、図４に示した状態から、図５に示すように作業空間８をさらに掘削し、既存基礎１とその両側に設けた補強基礎９の底部にさらに補強基礎１５を新設して一体化する。また、作業空間８の底部には基礎底盤１６を新設し、その基礎底盤１６と補強基礎１５との間に積層ゴム等の免震装置１７を設置する。補強基礎１５や基礎底盤１６の施工、免震装置１７の設置には、上述した特許文献１に示されている工法が好適に採用可能である。 That is, from the state shown in FIG. 4 , the work space 8 is further excavated as shown in FIG. 5 , and the reinforcement foundation 15 is newly installed and integrated at the bottom of the existing foundation 1 and the reinforcement foundation 9 provided on both sides thereof. . A base bottom 16 is newly installed at the bottom of the work space 8, and a seismic isolation device 17 such as laminated rubber is installed between the base bottom 16 and the reinforcing base 15. Construction of reinforced foundation 15 and underlying bottom plate 16, the installation of the seismic isolation device 17, can be suitably employed method disclosed in Patent Document 1 described above.

このような免震化工法によれば、作業空間８での作業のみで既存床３や既存基礎１に対する補強を行ったうえで、補強後の各基礎の下部に免震装置１７を順次設置していくことにより、既存建物を使用しながら免震化することが可能である。そして、その作業のために確保した作業空間８は、免震装置１７の設置スペースかつその保守点検スペースとしての免震ピットとしてそのまま残置すれば良いから、極めて合理的にして有効である。   According to such a seismic isolation method, the existing floor 3 and the existing foundation 1 are reinforced only by the work in the work space 8, and the seismic isolation device 17 is sequentially installed at the lower part of each foundation after the reinforcement. By doing so, it is possible to make seismic isolation while using existing buildings. The work space 8 secured for the work may be left as it is as an installation space for the seismic isolation device 17 and as a seismic isolation pit as a maintenance and inspection space, which is extremely rational and effective.

なお、本発明は上記各実施形態に限定されるものでは勿論なく、本発明の要旨を逸脱しない範囲で様々な変形、応用が可能であることは言うまでもない。   Of course, the present invention is not limited to the above embodiments, and various modifications and applications can be made without departing from the scope of the present invention.

たとえば、上記各実施形態は老朽化した煉瓦造の建物を対象としたが、本発明は煉瓦造に限らず様々な構造の既存建物に対しても同様に適用可能であることは言うまでもない。 For example, each of the above embodiments is directed to an old brick building, but it goes without saying that the present invention is not limited to brick building but can be applied to existing buildings having various structures .

本発明の補強工法の実施形態を示すもので、補強対象の既存基礎および既存床である土間コンクリートを示す図である。The embodiment of the reinforcement construction method of the present invention is shown, and it is a figure showing soil concrete which is an existing foundation and an existing floor to be reinforced. 同、土間コンクリートの支持地盤の一部を溝状に掘削した状態を示す図である。It is a figure which shows the state which excavated a part of support ground of soil concrete in the shape of a groove | channel similarly. 同、作業空間を確保した状態を示す図である。It is a figure which shows the state which secured the work space similarly. 同、補強構造体としての構造スラブを設置した状態を示す図である。It is a figure which shows the state which installed the structural slab as a reinforcement structure same as the above. 本発明の免震化工法の実施形態を示すもので、上記補強工法により既存床おAn embodiment of the seismic isolation method of the present invention is shown. よび既存基礎を補強したうえで免震装置を設置した状態を示す図である。It is a figure which shows the state which installed the seismic isolation apparatus, after reinforcing the existing foundation.

符号の説明Explanation of symbols

１ 既存基礎
２ 無筋コンクリート
３ 既存床（土間コンクリート）
４ 支持地盤
５ 掘削溝
６ 支柱
７ 根太
８ 作業空間（免震ピット）
９ 補強基礎
１０ 緊張材
１１ 構造スラブ（補強構造体）
１５ 補強基礎
１６ 基礎底盤
１７ 免震装置 1 Existing foundation 2 Unreinforced concrete 3 Existing floor (concrete concrete)
4 Support ground 5 Excavation groove 6 Strut 7 Jota 8 Work space (Seismic isolation pit)
9 Reinforcement foundation 10 Tensile material 11 Structural slab (reinforcement structure)
15 Reinforcement foundation 16 Foundation bottom 17 Seismic isolation device

Claims (2)

既存建物の最下階に土間コンクリートにより形成されている既存床を補強するための補強工法であって、
既存床である土間コンクリートの支持地盤を溝状に掘削し、その掘削溝に設置した支柱により根太を介して既存床を支持しつつ掘削溝を周囲に拡大しては支柱を周囲に増設していって既存床の下方に作業空間を確保し、その作業空間内での作業により既存基礎の周囲に補強基礎を一体に設けるとともに、前記既存床の下面側にそれを支持する補強構造体としての構造スラブを前記補強基礎により支持して該補強基礎間に形成して、既存床を支持していた根太をその構造スラブ中に埋設して残置することを特徴とする既存床の補強工法。 Reinforcement method to reinforce the existing floor formed of soil concrete on the lowest floor of an existing building,
Excavated concrete support ground, which is an existing floor, is excavated into a groove shape, and the excavation groove is expanded to the surroundings while supporting the existing floor via joists using the struts installed in the excavated grooves, and pillars are added to the surroundings. ensuring the working space below the existing floor I, provided with integrally reinforcing foundation around the existing foundation by working within the working space, as a reinforcing structure for supporting the lower surface side of the existing floor A structural slab is supported by the reinforcing foundation, formed between the reinforcing foundations, and the joist supporting the existing floor is buried and left in the structural slab . 最下階の床が土間コンクリートにより形成されている既存建物を対象として免震建物に改修するための免震化工法であって、
請求項１記載の補強工法によって土間コンクリートの既存床を補強するとともに補強構造体としての構造スラブによって最下階での水平剛性を確保し、作業空間での作業によって既存基礎および補強基礎の下方をさらに掘削してそこに免震装置を設置し、既存建物全体を免震装置により免震支持するとともに作業空間を免震ピットとして残置することを特徴とする既存建物の免震化工法。 It is a seismic isolation method for renovating an existing building whose bottom floor is made of soil concrete to a seismic isolation building,
The existing floor of the soil concrete is reinforced by the reinforcing method according to claim 1 , and the horizontal rigidity at the lowermost floor is secured by the structural slab as the reinforcing structure, and the lower part of the existing foundation and the reinforcing foundation is lowered by the work in the work space. A seismic isolation method for existing buildings, characterized by further excavating and installing seismic isolation devices there, supporting the entire existing building with seismic isolation devices and leaving the work space as seismic isolation pits.
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JP4786973B2 (en) * 2005-09-01 2011-10-05 株式会社竹中工務店 Construction method to renovate the floor part around the column base of the existing structure
JP2008156930A (en) * 2006-12-25 2008-07-10 Takenaka Komuten Co Ltd Base-isolating and repairing method for existing building having earthen floor
JP2009155794A (en) * 2007-12-25 2009-07-16 Shimizu Corp Base isolation construction method
CN103741963B (en) * 2014-01-06 2015-09-09 北京筑福国际工程技术有限责任公司 A kind of workshop foundation reinforcement means
JP6326279B2 (en) * 2014-04-30 2018-05-16 大成建設株式会社 Seismic isolation repair method for pile foundation structures
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CN102704705A (en) * 2012-06-06 2012-10-03 河北省建筑科学研究院 Building long-stroke redescending-free multi-point synchronous jacking method
CN102704705B (en) * 2012-06-06 2014-08-06 河北省建筑科学研究院 Building long-stroke redescending-free multi-point synchronous jacking method

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