JP3728654B2 - Building dismantling and construction methods - Google Patents

Building dismantling and construction methods Download PDF

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Publication number
JP3728654B2
JP3728654B2 JP2000118578A JP2000118578A JP3728654B2 JP 3728654 B2 JP3728654 B2 JP 3728654B2 JP 2000118578 A JP2000118578 A JP 2000118578A JP 2000118578 A JP2000118578 A JP 2000118578A JP 3728654 B2 JP3728654 B2 JP 3728654B2
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building
lower structure
floor slab
dismantling
existing building
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JP2001303599A (en
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康弘 秋江
幸雄 小山
俊二 佐波
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Shimizu Corp
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Shimizu Corp
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【０００１】
【発明の属する技術分野】
本発明は、既存建物を解体し、その後に同じ場所に新たに建物を構築するための建物の解体・構築方法に関するものである。
【０００２】
【従来の技術】
周知のように、既存建物を解体し、その後に同じ場所に新たに建物を構築する際には、既存建物を上部構造および下部構造を含めて解体し、解体に伴い発生した解体材を除去するとともに、その後に同じ場所に、山留め等の仮設支保工を設置して、そこに新たに構築すべき建物の下部構造を施工し、さらに、下部構造の施工終了後に、下部構造上に上部構造を構築するといった方法が通常用いられる。
また、いうまでもなく、このような建物の施工終了後には、仮設支保工は撤去される。
【０００３】
【発明が解決しようとする課題】
しかしながら、上述の建物の解体・構築方法においては、建物の解体、解体材の除去、仮設支保工の設置、下部構造の施工、上部構造の施工等の各工事が順次、行われることとなるために、これらのうち一つの工事に作業上の不都合等が生じると全体の工期が遅れてしまうという問題点がある。
【０００４】
また、このように、既存建物の存在していた場所に新たに建物を構築する際には、当然に、建物自体の建築材料費に加え、解体費用、仮設費用等が別個に発生するため、これらの費用をできる限り低減することのできる技術が求められている。
【０００５】
本発明は、このような事情に鑑みなされたものであり、工期を短縮することが可能であり、なおかつ低コストで実現できるような建物の解体・構築方法を提供することを課題とする。
【０００６】
【課題を解決するための手段】
上記課題を解決するために本発明においては以下の手段を採用した。
すなわち、請求項１記載の発明は、既存建物を、その下部構造を残して解体し、
該下部構造を山留めとして利用しつつ、該下部構造の内側に、新たに構築すべき建物の下部構造を新設する一方、新たに構築すべき建物の上部構造を前記既存建物の下部構造の上方位置に新設する建物の解体・構築方法であって、
前記既存建物の下部構造を山留めとして利用する際には、新たに構築すべき建物の床スラブを前記既存建物の下部構造の内部に設置して該床スラブを切り梁として利用し、
前記既存建物を解体する際には、発生した解体材を前記既存建物の下部構造の内部に集積させ、集積させた解体材の上面を前記床スラブを構築する際の作業床として利用し、
前記床スラブを構築する際には、集積させた前記解体材の上面から、前記既存建物の下部構造を貫通してその下方の地盤にまで到達するような掘削孔を形成するとともに、該掘削孔内に基礎杭を構築しておき、該基礎杭の杭頭に支持材を立設し、該支持材を介して前記床スラブの荷重を前記基礎杭から支持させることを特徴としている。
【０００７】
このような構成により、山留め設置に係る仮設費用を省略することができる。また、新たに設置した下部構造を既存躯体の下部構造と一体化させれば、仮設除去に係る費用をも省略することができる。
【０００９】
また、このような構成により、切り梁設置に係る仮設費用を省略するとともに、本設構造を利用して信頼性の高い切り梁を実現できる。
【００１３】
さらに、このような構成により、床スラブの構築作業を容易に行うことができる。
【００１５】
加えて、このような構成により、基礎杭の施工と同時に、床スラブを支持するための支持材を設置することができ、これにより、床スラブの下方の解体材を除去する作業を、基礎杭の設置後すぐに行うことができる。
【００１８】
【発明の実施の形態】
以下、本発明の実施の形態を、図面に基づいて説明する。
図１は、本発明の一実施の形態である建物１を、その地下躯体（下部構造）２を中心に示したものである。この建物１は既存建物を解体し、それと同位置に新設されたものであり、その地下躯体２が、上部構造が解体された既存躯体の下部構造３の内側に、下部構造３と一体的に形成されている。
【００１９】
また、この地下躯体２は、その下面を構成するマットスラブ４と、既存建物の下部構造３の側壁部３ａを補強するためのバットレス補強体５と、バットレス補強体５の内側に形成された側壁部６と、側壁部６およびバットレス補強体５間に充填されたコンクリートグラウト７とにより概略構成されている。
【００２０】
この地下躯体２は既存建物の下部構造３の底面３ｂを貫通して、その下方の地盤Ｇに至るように設けられた基礎杭８，８，…により支持される構成となっている。基礎杭８は、場所打ちコンクリート杭として形成されたものであり、その杭頭部８ａには構真柱（支持材）９が一体的に立設されている。また、その構真柱９は、その上端部９ａが建物１の１階床スラブ１０に接続されており、これにより、構真柱９，９，…を介して１階床スラブ１０が基礎杭８，８，…側から支持された構成となっている。
【００２１】
次に、既存建物を解体してこのような建物１を構築するための方法について説明する。
これには、まず、図２に示すように、既存建物の上部構造１２を解体する。この際、予め、既存建物の下部構造３の側壁部３ａを補強するためのバットレス補強体５を形成しておくとともに、下部構造３の底面３ｂの二重ピット１３内にコンクリートグラウト１４を施しておく。そして、既存建物をその下部構造３を残して解体する。この際、発生した解体材１５は、下部構造３内部に集積させて敷き詰めておく。
【００２２】
次に、図３に示すように、集積した解体材１５の上面１５ａを作業床として利用しつつ、解体材１５の上面１５ａから地盤Ｇに向けて掘削孔１６を形成し、この掘削孔１６内に基礎杭８を構築する。この場合、基礎杭８の杭頭部８ａの上面が下部構造３の底面３ｂと略同一レベルに位置するようにする。
また、基礎杭８の施工と同時に、基礎杭８の杭頭部８ａから解体材１５の上面１５ａと同一レベルにまで至るように構真柱９を設置する。
【００２３】
次に、図４に示すように、集積した解体材１５の上面１５ａ上に、建物１の１階床スラブ１０を構真柱９に支持させた状態に形成する。この場合、１階床スラブ１０の一部には、図示しない開口部を設けておく。
【００２４】
さらに、１階床スラブ１０の構築が終了したら、１階床スラブ１０の下方に位置する解体材１５を１階床スラブ１０に設けられた開口部を通じて撤去し、さらに、地下躯体２の底面となるマットスラブ４を既存躯体の下部構造３の底面の上方に一体的に形成する。
【００２５】
そして、図６に示すように、１階床スラブ１０の下方に位置する地下躯体２の側壁部６その他の施工作業を行い、また、この施工作業と同時に、１階床スラブ１０の上方に位置することとなる新たに構築すべき建物１の上部構造１８を構築していく。これにより建物１を完成させることができる。
【００２６】
以上述べた建物の解体・構築方法においては、既存建物を解体する際に、その下部構造３を一部を残すこととし、さらに、この下部構造３を山留めとして利用しつつ、下部構造３の内側に新たに建物１の地下躯体２を新設し、さらに、新たに構築すべき建物１の上部構造１８を既存建物の下部構造３の上方位置に新設するようになっている。これにより、新たに構築すべき建物１の地下躯体２を施工する際に、山留め設置に係る仮設費用を省略することができ、低コストでの施工が可能となる。また、新たに設けた地下躯体２を既存建物の下部構造３と一体化させるようにすることにより、従来と比較した場合、仮設除去に係る費用を省略することができ、より一層低コスト化に貢献することが可能となる。
【００２７】
また、この建物の解体・構築方法においては、既存建物の下部構造３を山留めとして利用する際に、新たに構築すべき建物１の１階床スラブ１０を既存建物の下部構造３内部に設置し、この１階床スラブ１０を切り梁として利用するようにしたため、切り梁設置に係る仮設費用を省略することができ、より一層のコスト削減を図ることが可能となる。さらに、切り梁として本設構造を利用することができるために、その信頼性が高く、安全な施工を行うことが可能となる。
【００２８】
また、上述の建物の解体・構築方法においては、１階床スラブ１０を構築した後に、新たに構築すべき建物の上部構造１８および地下躯体２を１階床スラブ１０の上下において同時に施工することできるために、新たに設置すべき建物１の工事工程を短縮化することができ、建物の解体・構築作業全体の短工期化を図ることが可能となる。
【００２９】
さらに、上述の建物の解体・構築方法においては、既存建物を解体する際に発生した解体材１５を既存建物の下部構造３の内部に集積させ、集積させた解体材１５の上面１５ａを新たに構築すべき建物１の１階床スラブ１０を構築する際の作業床として利用するようにしたために、１階床スラブ１０の型枠設置・配筋等を含めた構築作業を容易に行うことができ、施工性がよい。
【００３０】
さらに、上述の建物の解体・構築方法においては、１階床スラブ１０を構築する際に集積させた解体材１５の上面１５ａから既存建物の下部構造３を貫通してその下方の地盤Ｇにまで到達するような掘削孔１６を形成するとともに、掘削孔１６内に基礎杭８を構築しておき、さらに、基礎杭８の杭頭部８ａに立設した構真柱９により、１階床スラブ１０の荷重を基礎杭８側から支持させるようにしたために、１階床スラブ１０を構築すると同時にその荷重を支持することができ、これによって、１階床スラブ１０の下方に位置する解体材１５の除去作業を、仮設設置などを要することなく、１階床スラブ１０の設置後に速やかに行うことができ、施工期間が短縮されることとなる。
【００３１】
また、上述の建物１においては、上部構造１２が解体された既存建物の下部構造３の内側に地下躯体２が設置され、この地下躯体２が既存建物の下部構造３を貫通して地盤Ｇに至るように設置された基礎杭８により支持された構成とされるとともに、この基礎杭８の杭頭部８ａ上に立設された構真柱９により１階床スラブ１０が基礎杭８側から支持された構成となっているために、施工時に既存建物の下部構造３を地下躯体２設置時の山留め壁として利用することができるとともに、１階床スラブ１０を山留め壁を支持するための切り梁として用いることができ、これにより、従来に比較して仮設費用を大幅に削減することができ、建設コストの大幅な削減を図ることができる。また山留め壁や切り梁などの仮設支保工が必要とならず、なおかつ、上部構造１８および地下躯体２を同時施工できるために、大きく工期を短縮することが可能となる。
以上により、既存建物を解体した場所に低コストかつ短工期で新たな建物１を構築することが可能となる。
【００３２】
【発明の効果】
以上説明したように、請求項１に係る建物の解体・構築方法においては、既存建物を解体する際に、その下部構造を一部を残すこととし、さらに、この下部構造を山留めとして利用しつつ、下部構造の内側に新たに建物の下部構造を新設し、さらに、新たに構築すべき建物の上部構造を既存建物の下部構造の上方位置に新設するようになっているために、新たに構築すべき建物の下部構造を施工する際に、山留め設置に係る仮設費用を省略することができ、これにより低コストでの施工が可能となる。また、新たに設けた下部構造を既存建物の下部構造と一体化することにより、従来と比較した場合、仮設除去に係る費用を省略することができ、より一層低コスト化に貢献することが可能となる。
【００３３】
また、請求項１に係る建物の解体・構築方法においては、既存建物の下部構造を山留めとして利用する際に、新たに構築すべき建物の床スラブを既存建物の下部構造内部に設置し、この床スラブを切り梁として利用するようにしたため、切り梁設置に係る仮設費用を省略することができ、より一層のコスト削減を図ることが可能となる。さらに、切り梁として本設構造を利用することができるために、その信頼性が高く、安全な施工を行うことが可能となる。
【００３５】
さらに、請求項１に係る建物の解体・構築方法においては、既存建物を解体する際に発生した解体材を既存建物の下部構造の内部に集積させ、集積させた解体材の上面を新たに構築すべき建物の床スラブを構築する際の作業床として利用するようにしたために、床スラブの構築作業を容易に行うことができ、施工性がよい。
【００３６】
加えて、請求項１に係る建物の解体・構築方法においては、床スラブを構築する際に、集積させた解体材の上面から既存建物の下部構造を貫通してその下方の地盤にまで到達するような掘削孔を形成するとともに、掘削孔内に基礎杭を構築しておき、さらに、基礎杭の杭頭に立設した支持材により、床スラブの荷重を基礎杭側から支持させるようにしたために、床スラブを構築すると同時にその荷重を支持させることができ、これによって、床スラブの下方に位置する解体材の除去作業を、仮設設置などを要することなく、床スラブ設置後に速やかに行うことができ、施工期間が短縮されることとなる。
【図面の簡単な説明】
【図１ 】 本発明の一実施の形態である建物をその地下躯体を中心に示した立断面図である。
【図２ 】 既存建物を解体して、それと同位置に図１に示した建物を構築する際の工程を示す図であって、既存建物を解体した場合の状況を示す立断面図である。
【図３ 】 図２の次工程を示す立断面図である。
【図４ 】 図３の次工程を示す立断面図である。
【図５ 】 図４の次工程を示す立断面図である。
【図６ 】 図５の次工程を示す立断面図である。
【符号の説明】
１ 建物
２ 地下躯体（下部構造）
３ （既存建物の）下部構造
８ 基礎杭
８ａ 杭頭部
９ 構真柱（支持材）
１０ １階床スラブ
１２ （既存建物の）上部構造
１５ 解体材
１５ａ 上面
１６ 掘削孔
１８ （新設建物の）上部構造[0001]
BACKGROUND OF THE INVENTION
The present invention is to dismantle the existing building, is relates to the subsequent dismantling and construction how the building for the newly constructed building in the same location.
[0002]
[Prior art]
As is well known, when dismantling an existing building and then building a new building at the same location, dismantle the existing building, including the superstructure and substructure, and remove the dismantling material generated by the dismantling At the same time, install a temporary support such as a mountain stop in the same place, and construct the lower structure of the building to be newly constructed there. Furthermore, after the construction of the lower structure is completed, the upper structure is built on the lower structure. A method such as construction is usually used.
Needless to say, the temporary support is removed after the construction of such a building is completed.
[0003]
[Problems to be solved by the invention]
However, in the building demolition / construction method described above, each work such as building demolition, removal of demolition materials, installation of temporary support works, construction of the substructure, construction of the superstructure, etc. will be performed sequentially. In addition, there is a problem that if one of these works causes inconvenience in work, the entire construction period is delayed.
[0004]
In addition, in this way, when building a new building in the place where the existing building existed, naturally, in addition to the building material cost of the building itself, dismantling cost, temporary cost, etc. will occur separately, There is a need for a technique that can reduce these costs as much as possible.
[0005]
The present invention has been made in view of such circumstances, it is possible to shorten the construction period, yet it is an object to provide a dismantling-building how the building as realized at a lower cost.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
That is, the first aspect of the present invention, the existing building, disassembled leaving the substructure,
The lower structure of the building to be newly constructed is newly installed inside the lower structure while the lower structure is used as a mountain retaining, while the upper structure of the building to be newly constructed is positioned above the lower structure of the existing building. Is a method of dismantling and building a new building,
When using the lower structure of the existing building as a mountain stop, install the floor slab of the building to be newly constructed inside the lower structure of the existing building and use the floor slab as a cut beam,
When dismantling the existing building, the generated dismantling material is accumulated in the lower structure of the existing building, and the upper surface of the accumulated dismantling material is used as a work floor when constructing the floor slab,
When constructing the floor slab, the excavation hole is formed from the upper surface of the accumulated demolition material so as to penetrate the lower structure of the existing building and reach the ground below the excavation hole. A foundation pile is built in, a support material is erected on the pile head of the foundation pile, and the load of the floor slab is supported from the foundation pile via the support material .
[0007]
With such a configuration, it is possible to omit a temporary cost related to the installation of the mountain mount. Moreover, if the newly installed lower structure is integrated with the lower structure of the existing housing, the cost for temporary removal can be omitted.
[0009]
Further, with such a configuration , it is possible to realize a highly reliable beam using the main structure while omitting the temporary cost for installing the beam.
[0013]
Furthermore, the construction work of the floor slab can be easily performed by such a configuration.
[0015]
In addition, with such a configuration, a support material for supporting the floor slab can be installed simultaneously with the construction of the foundation pile, thereby removing the dismantling material below the floor slab. Can be done immediately after installation.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a building 1 according to an embodiment of the present invention centering on an underground structure (lower structure) 2 thereof. This building 1 was constructed by dismantling an existing building and newly installed at the same position. The underground structure 2 is integrated with the lower structure 3 inside the lower structure 3 of the existing structure from which the upper structure was disassembled. Is formed.
[0019]
In addition, the underground skeleton 2 includes a mat slab 4 constituting the lower surface thereof, a buttress reinforcement body 5 for reinforcing the side wall portion 3a of the lower structure 3 of the existing building, and a side wall formed inside the buttress reinforcement body 5. It is roughly constituted by a portion 6 and a concrete grout 7 filled between the side wall portion 6 and the buttress reinforcement 5.
[0020]
This underground frame 2 is configured to be supported by foundation piles 8, 8,... That pass through the bottom surface 3 b of the lower structure 3 of the existing building and reach the ground G below. The foundation pile 8 is formed as a cast-in-place concrete pile, and a built-up column (support material) 9 is erected integrally with the pile head 8a. In addition, the upper end 9a of the structural pillar 9 is connected to the first floor slab 10 of the building 1, so that the first floor slab 10 is connected to the foundation pile via the structural pillars 9, 9,. It is the structure supported from the 8, 8, ... side.
[0021]
Next, a method for dismantling an existing building and constructing such a building 1 will be described.
For this, first, as shown in FIG. 2, the superstructure 12 of the existing building is dismantled. At this time, a buttress reinforcement 5 for reinforcing the side wall 3a of the lower structure 3 of the existing building is formed in advance, and a concrete grout 14 is applied in the double pit 13 on the bottom surface 3b of the lower structure 3. deep. Then, the existing building is dismantled leaving the lower structure 3. At this time, the generated dismantling material 15 is accumulated and spread inside the lower structure 3.
[0022]
Next, as shown in FIG. 3, the excavation hole 16 is formed from the upper surface 15 a of the dismantling material 15 toward the ground G while using the upper surface 15 a of the accumulated dismantling material 15 as a work floor. The foundation pile 8 is constructed. In this case, the upper surface of the pile head 8a of the foundation pile 8 is positioned substantially at the same level as the bottom surface 3b of the lower structure 3.
Simultaneously with the construction of the foundation pile 8, the structural pillar 9 is installed so as to reach the same level as the upper surface 15 a of the dismantling material 15 from the pile head 8 a of the foundation pile 8.
[0023]
Next, as shown in FIG. 4, the first-floor slab 10 of the building 1 is formed on the upper surface 15 a of the accumulated dismantling material 15 so as to be supported by the construction pillar 9. In this case, an opening (not shown) is provided in a part of the first floor slab 10.
[0024]
Further, when the construction of the first floor slab 10 is completed, the dismantling material 15 located below the first floor slab 10 is removed through the opening provided in the first floor slab 10, and further, The mat slab 4 is integrally formed above the bottom surface of the lower structure 3 of the existing housing.
[0025]
And as shown in FIG. 6, the side wall part 6 of the underground frame 2 located under the 1st floor slab 10 and other construction work are performed, and simultaneously with this construction work, it is located above the 1st floor slab 10 The superstructure 18 of the building 1 to be newly constructed is to be constructed. Thereby, the building 1 can be completed.
[0026]
In the building dismantling / construction method described above, when the existing building is dismantled, a part of the lower structure 3 is left, and further, the lower structure 3 is used as a mountain retaining, The basement 2 of the building 1 is newly established, and the upper structure 18 of the building 1 to be newly constructed is newly installed above the lower structure 3 of the existing building. Thereby, when constructing the underground skeleton 2 of the building 1 to be newly constructed, it is possible to omit the temporary cost related to the installation of the mountain retaining, and it is possible to construct at a low cost. Further, by integrating the newly installed underground structure 2 with the lower structure 3 of the existing building, the cost for temporary removal can be omitted when compared with the conventional structure, and the cost can be further reduced. It is possible to contribute.
[0027]
Further, in this building demolition and construction method, when the lower structure 3 of the existing building is used as a mountain stop, the first floor slab 10 of the building 1 to be newly constructed is installed inside the lower structure 3 of the existing building. Since the first floor slab 10 is used as a cut beam, a temporary cost for installing the cut beam can be omitted, and further cost reduction can be achieved. Further, since the main structure can be used as a cutting beam, its reliability is high and safe construction can be performed.
[0028]
Moreover, in the above-mentioned building dismantling / construction method, after constructing the first floor slab 10, the upper structure 18 and the underground skeleton 2 of the building to be newly constructed are simultaneously constructed above and below the first floor slab 10. Therefore, it is possible to shorten the construction process of the building 1 to be newly installed, and to shorten the construction period of the entire building demolition / construction work.
[0029]
Furthermore, in the above-mentioned building dismantling / construction method, the dismantling material 15 generated when dismantling the existing building is accumulated in the lower structure 3 of the existing building, and the accumulated upper surface 15a of the dismantling material 15 is newly added. Since the first floor slab 10 of the building 1 to be constructed is used as a work floor when the first floor slab 10 is constructed, it is possible to easily perform the construction work including the formwork installation and the bar arrangement of the first floor slab 10. Yes, workability is good.
[0030]
Further, in the building demolition / construction method described above, from the upper surface 15a of the demolition material 15 accumulated when constructing the first floor slab 10, the lower structure 3 of the existing building is penetrated to the ground G below it. In addition to forming a drilling hole 16 to reach, a foundation pile 8 is constructed in the drilling hole 16, and a first-floor slab is further formed by a built-up column 9 erected on a pile head 8 a of the foundation pile 8. Since the load of 10 is supported from the foundation pile 8 side, the load can be supported at the same time that the first-floor slab 10 is constructed, and thereby the dismantling material 15 positioned below the first-floor slab 10. The removal work can be performed promptly after the installation of the first floor slab 10 without requiring temporary installation and the construction period is shortened.
[0031]
Moreover, in the above-mentioned building 1, the underground frame 2 is installed inside the lower structure 3 of the existing building where the upper structure 12 is dismantled, and this underground frame 2 penetrates the lower structure 3 of the existing building to the ground G. It is set as the structure supported by the foundation pile 8 installed so that the 1st-floor slab 10 may be supported from the foundation pile 8 side by the construction pillar 9 standing on the pile head 8a of this foundation pile 8. Because of the supported structure, the lower structure 3 of the existing building can be used as a retaining wall when installing the underground skeleton 2 during construction, and the first floor slab 10 is cut to support the retaining wall. It can be used as a beam, and as a result, the temporary cost can be greatly reduced as compared with the conventional case, and the construction cost can be greatly reduced. In addition, temporary support work such as a retaining wall or a cutting beam is not required, and the superstructure 18 and the underground frame 2 can be simultaneously constructed, so that the construction period can be greatly shortened.
As described above, a new building 1 can be constructed at a low cost and in a short construction period in a place where an existing building is demolished.
[0032]
【The invention's effect】
As described above, in the building dismantling / construction method according to claim 1, when dismantling the existing building, a part of the lower structure is left, and the lower structure is used as a mountain stop. New construction of the lower structure of the building inside the lower structure, and further construction of the upper structure of the building to be newly constructed above the lower structure of the existing building When constructing the lower structure of a building to be constructed, temporary costs related to the installation of mountain retaining can be omitted, thereby enabling construction at a low cost. In addition, by integrating the newly installed substructure with the substructure of the existing building, the cost of temporary removal can be omitted compared to the conventional structure, which can contribute to further cost reduction. It becomes.
[0033]
Further, in the building dismantling / construction method according to claim 1 , when the lower structure of the existing building is used as a mountain stop, the floor slab of the building to be newly constructed is installed inside the lower structure of the existing building. Since the floor slab is used as a cut beam, the temporary cost for installing the cut beam can be omitted, and the cost can be further reduced. Further, since the main structure can be used as a cutting beam, its reliability is high and safe construction can be performed.
[0035]
Furthermore, in the building demolition / construction method according to claim 1 , the demolition material generated when demolishing the existing building is accumulated inside the lower structure of the existing building, and the upper surface of the accumulated demolition material is newly constructed. Since it is used as a work floor when building a floor slab of a building to be built, the building work of the floor slab can be easily performed and the workability is good.
[0036]
In addition, in the building demolition / construction method according to claim 1, when building the floor slab, it penetrates the lower structure of the existing building from the upper surface of the accumulated demolition material to reach the ground below it. The foundation pile was built in the excavation hole, and the load of the floor slab was supported from the foundation pile side by the support material standing on the pile head of the foundation pile. In addition, the load can be supported at the same time that the floor slab is constructed, so that the dismantling material located below the floor slab can be removed quickly after the floor slab is installed without requiring temporary installation. The construction period will be shortened.
[Brief description of the drawings]
FIG. 1 is an elevational sectional view showing a building according to an embodiment of the present invention centering on an underground skeleton.
FIG. 2 is a vertical sectional view showing a process when the existing building is dismantled and the building shown in FIG. 1 is constructed at the same position, and the existing building is dismantled.
FIG. 3 is an elevational sectional view showing a step subsequent to that in FIG. 2;
FIG. 4 is an elevational sectional view showing a step subsequent to that in FIG. 3;
FIG. 5 is an elevational sectional view showing a next process of FIG. 4;
6 is an elevational sectional view showing a step subsequent to FIG. 5. FIG.
[Explanation of symbols]
1 Building 2 Underground frame (substructure)
3 Substructure 8 (existing building) Foundation pile 8a Pile head 9 Construction column (support material)
10 First floor slab 12 Superstructure (for existing building) 15 Demolition material 15a Top surface 16 Excavation hole 18 Superstructure (for new building)

Claims (1)

既存建物を、その下部構造を残して解体し、
該下部構造を山留めとして利用しつつ、該下部構造の内側に、新たに構築すべき建物の下部構造を新設する一方、新たに構築すべき建物の上部構造を前記既存建物の下部構造の上方位置に新設する建物の解体・構築方法であって、
前記既存建物の下部構造を山留めとして利用する際には、新たに構築すべき建物の床スラブを前記既存建物の下部構造の内部に設置して該床スラブを切り梁として利用し、
前記既存建物を解体する際には、発生した解体材を前記既存建物の下部構造の内部に集積させ、集積させた解体材の上面を前記床スラブを構築する際の作業床として利用し、
前記床スラブを構築する際には、集積させた前記解体材の上面から、前記既存建物の下部構造を貫通してその下方の地盤にまで到達するような掘削孔を形成するとともに、該掘削孔内に基礎杭を構築しておき、該基礎杭の杭頭に支持材を立設し、該支持材を介して前記床スラブの荷重を前記基礎杭から支持させることを特徴とする建物の解体・構築方法。The existing building, dismantled, leaving the lower structure,
The lower structure of the building to be newly constructed is newly installed inside the lower structure while the lower structure is used as a mountain retaining, while the upper structure of the building to be newly constructed is positioned above the lower structure of the existing building. Is a method of dismantling and building a new building,
When using the lower structure of the existing building as a mountain stop, install the floor slab of the building to be newly constructed inside the lower structure of the existing building and use the floor slab as a cut beam,
When dismantling the existing building, the generated dismantling material is accumulated in the lower structure of the existing building, and the upper surface of the accumulated dismantling material is used as a work floor when constructing the floor slab,
When constructing the floor slab, the excavation hole is formed from the upper surface of the accumulated demolition material so as to penetrate the lower structure of the existing building and reach the ground below the excavation hole. Building demolition characterized in that a foundation pile is built in, a support material is erected on the pile head of the foundation pile, and the load of the floor slab is supported from the foundation pile via the support material -Construction method.
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