JP3816183B2

JP3816183B2 - How to add a base-isolated building and how to build a base-isolated building

Info

Publication number: JP3816183B2
Application number: JP10053397A
Authority: JP
Inventors: 康夫塚田
Original assignee: Taisei Corp
Current assignee: Taisei Corp
Priority date: 1997-04-17
Filing date: 1997-04-17
Publication date: 2006-08-30
Anticipated expiration: 2017-04-17
Also published as: JPH10292643A

Description

【０００１】
【発明の属する技術分野】
この発明は、免震建物の増築方法及び免震建物の新築方法に関する。
【０００２】
【従来の技術】
図６及び図７は免震建物の増築途中を示すものである。図中符号２は既存の免震建物であり、免震装置セット用基礎４に複数の免震装置６をセットし、免震装置６上に建物基礎８を設置し、この建物基礎８上に上部躯体１０の施工を行って構築されている。
【０００３】
そして、既存の免震建物２の増築を行うには、先ず、既存の免震建物２と隣接する地盤を掘削して免震装置セット用基礎１２を形成し、その免震装置セット用基礎１２上に複数の免震装置６を設置する。そして、免震装置６上に既存の免震建物２の建物基礎８と連結した建物基礎１４を設置し、さらに、その建物基礎１４上に図７の二点鎖線で示す増築用の上部躯体１６を順次施工していく。
【０００４】
【発明が解決しようとする課題】
ところで、図６及び図７で示した免震建物は、増築が完成した時点の建物挙動を想定して免震設計を行っており、若し、増築の途中に地震力を受けると既存の免震建物２に影響を与えるおそれがある。
【０００５】
すなわち、増築用の上部躯体１６を構築する前に水平Ｙ方向の地震力を受けると、互いに連結した建物基礎８、１４下部の免震装置６、２０で構成される免震層の剛心Ｐ₁と上部躯体１０の重心Ｐ₂が一致していないので、免震層の一体化により建物に捩じれ振動が発生するおそれがある。
【０００６】
また、水平Ｘ方向の地震力を受けると、免震層の水平剛性に対して上部躯体１０の重量が完成時に比べて軽すぎるため、上部躯体１０と建物基礎８、１４及び免震装置６で構成される建物の固有周期が完成時より短くなる。このため、増築前の上部躯体１０の免震性能が低下してしまう。
【０００７】
また、免震建物を増築する場合に限らず、例えば１棟の免震建物を複数の工期に分けて構築する場合にも同様の問題が発生する。すなわち、第１工期の第１免震建物を構築し、第２工期の第２免震建物を構築するに際し、基礎から含めて第１免震建物と一体的に構築していくと、構築途中で地震が発生した際に建物にねじり振動が発生したり、工期途中の免震建物の固有周期が完成時より短くなるため、第１免震建物の免震効果が薄れる。
【０００８】
この発明は、上記事情に鑑みてなされたものであり、免震建物を増築する場合、或いは１棟の免震建物を複数の工期に分けて構築する場合に、構築途中に地震が発生しても免震動作を確実に発揮することが可能な免震建物の増築方法及び免震建物の新築方法を提供することを目的とする。
【０００９】
【課題を解決するための手段】
本発明の請求項１記載の免震建物の増築方法は、既存の免震建物に隣接する免震装置セット用基礎に免震装置を設置し、次いで、前記免震装置上に第１建物基礎を設置し、この第１建物基礎上に第１上部躯体を施工して前記既存の免震建物と独立した増築免震建物を構築し、次いで、前記既存の免震建物の建物基礎と前記第１建物基礎との間を第２建物基礎で連結し、次いで、前記第２建物基礎上に第２上部躯体を施工し、且つこの第２上部躯体を前記既存の免震建物の上部躯体及び前記増築免震建物の第１上部躯体に一体化する方法である。
【００１０】
また、請求項２記載の免震建物の新築方法は、１棟の免震建物を複数の工期に分けて新築する方法であって、各工期に、それぞれ複数の免震建物を所定の間隔をあけて独立して構築し、全ての免震建物の構築が完了した後に、隣接する免震建物の建物基礎どうしを連結建物基礎で連結していき、それら連結建物基礎上に上部躯体を施工して１棟の免震建物を構築することを特徴とする方法である。
【００１１】
【発明の実施の形態】
以下、本発明に係わる免震建物の増築方法について、図面に基づいて説明する。なお、図６及び図７と同一構成部分には、同一符号を付して説明を省略する。
【００１２】
先ず、図１に示すように、既存の免震建物２の免震装置セット用基礎４と連続するように免震装置セット用基礎１８を形成する。そして、免震装置セット用基礎１８上に、増築建物用の免震装置２０を複数設置する。
【００１３】
次いで、図２に示すように、増築建物用の免震装置２０上に第１建物基礎２２を設置する。ここで、この第１建物基礎２２は、既存免震建物２の建物基礎８に対して所定の間隔Ｓをあけて設置している。そして、第１建物基礎２２上に第１上部躯体２４を施工することにより、既存の免震建物２と独立した増築用免震建物２６を構築する。
【００１４】
次いで、図３に示すように、既存免震建物２の建物基礎８と、増築用免震建物２６の第１建物基礎２２とを第２建物基礎２８により連結する。
次いで、図４に示すように、第２建物基礎２８上に第２上部躯体３０を施工していき、既存の免震建物２の上部躯体１０及び第１上部躯体２４と一体化することにより、既存の免震建物２の増築が完了する。
【００１５】
上述した免震建物の増築方法によると、図２に示す構築段階では、既存免震建物２及び増築用免震建物２６をそれぞれ独立して構築しているので、地震が発生しても、免震装置６が上部躯体１０の揺れを減少し、免震装置２０が第１上部躯体２４の揺れを減少して免震性能を充分に発揮する。
【００１６】
図５は図３の構築段階を平面視で示したものであるが、このような施工手順をとることで各構築段階で上部躯体の重心と免震層の剛心をほぼ一致させながら施工することができ、施工中における水平Ｙ方向の地震力を受けても建物に捩じれ振動が発生しない。
【００１７】
また、既存免震建物２と分離施工することで施工途中で大きな地震に遭遇しても既存免震建物２は当初の免震効果を発揮できる。
一方、上記実施形態では、既存の免震建物２を増築する方法について説明したが、１棟の免震建物を複数の工期に分けて新築する場合にも本発明を適用すると、構築途中で地震が発生しても免震動作を確実に発揮することができる。
【００１８】
すなわち、１棟の免震建物を複数の工期に分けて構築する場合には、図１で示した既存の免震建物２を第１工期に構築する免震建物とし、第２工期以降の免震建物を、図２で示した増築用免震建物２６のように独立して構築していく。そして、第１工期から最後の工期まで独立して免震建物を構築した後、各免震建物の建物基礎間を、図３で示した第２建物基礎２８と同一構造とした連結建物基礎で連結していく。そして、連結建物基礎上に上部躯体を施工することにより、１棟の免震建物を構築する。
【００１９】
上記方法により１棟の免震建物を新築すると、構築途中に地震が発生しても、独立して構築した免震建物は確実に免震動作を発揮することができる。
【００２０】
【発明の効果】
以上説明したように、請求項１記載の免震建物の増築方法によると、既存の免震建物と独立して増築免震建物を構築した後、既存の免震建物の建物基礎と増築免震建物の第１建物基礎との間を第２建物基礎で連結しているので、増築途中に地震が発生しても、既存の免震建物の上部躯体、増築免震建物の第２上部躯体に対して確実に免震動作を発揮することができる。
【００２１】
また、請求項２記載の免震建物の新築方法によると、各工期に、それぞれ複数の免震建物を所定の間隔をあけて独立して構築し、全ての免震建物の構築が完了した後に、隣接する免震建物の建物基礎どうしを連結建物基礎で連結しているので、新築途中に地震が発生しても、各免震建物の上部躯体に対して確実に免震動作を発揮することができる。
【図面の簡単な説明】
【図１】既存の免震建物に隣接する免震装置セット用基礎に免震装置を設置した構築段階を示す図である。
【図２】既存の免震建物に独立して増築免震建物を構築した構築段階を示す図である。
【図３】既存の免震建物の建物基礎と増築免震建物の第１建物基礎との間を、第２建物基礎で連結した構築段階を示す図である。
【図４】第２建物基礎上に第２上部躯体を施工して免震建物の増築が完了した状態を示す図である。
【図５】図３で示した構築段階を平面視で示した図である。
【図６】従来の免震建物の増築方法を平面視で示した図である。
【図７】従来の免震建物の構築方法を側面視で示した図である。
【符号の説明】
２既存の免震建物
４、１８免震装置セット用基礎
６、２０免震装置
８建物基礎
１０上部躯体
２２第１建物基礎
２４第１上部躯体
２６増築用免震建物
２８第２建物基礎
３０第２上部躯体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an extension method for a base-isolated building and a new method for building a base-isolated building.
[0002]
[Prior art]
6 and 7 show the expansion of the seismic isolation building. Reference numeral 2 in the figure denotes an existing seismic isolation building. A plurality of seismic isolation devices 6 are set on a base 4 for seismic isolation devices, and a building foundation 8 is installed on the seismic isolation device 6. It is constructed by constructing the upper housing 10.
[0003]
In order to add the existing seismic isolation building 2, first, the base 12 for the seismic isolation device set is formed by excavating the ground adjacent to the existing seismic isolation building 2, and the base 12 for the seismic isolation device set. A plurality of seismic isolation devices 6 are installed on the top. Then, the building foundation 14 connected to the building foundation 8 of the existing seismic isolation building 2 is installed on the seismic isolation device 6, and the extension upper frame 16 indicated by a two-dot chain line in FIG. Will be constructed sequentially.
[0004]
[Problems to be solved by the invention]
By the way, the seismic isolation building shown in FIG. 6 and FIG. 7 is designed for seismic isolation assuming the behavior of the building when the extension is completed. The earthquake building 2 may be affected.
[0005]
That is, when receiving the seismic force in the horizontal Y direction before constructing the upper housing 16 for extension, the rigid core P of the seismic isolation layer composed of the seismic isolation devices 6 and 20 below the building foundations 8 and 14 connected to each other. the center of gravity P ₂ ₁ and the upper skeleton 10 do not match, there is a risk that twisting the building vibrations are generated by integration of the seismic isolation layer.
[0006]
In addition, when receiving the seismic force in the horizontal X direction, the weight of the upper housing 10 is too light for the horizontal rigidity of the seismic isolation layer compared to the completed case, so the upper housing 10 and the building foundations 8 and 14 and the seismic isolation device 6 The natural period of the constructed building is shorter than when completed. For this reason, the seismic isolation performance of the upper housing 10 before the extension is deteriorated.
[0007]
Moreover, the same problem occurs not only when the base isolation building is added, but also when, for example, one base isolation building is divided into a plurality of construction periods. In other words, when the first seismic isolated building of the first construction period is constructed and the second seismic isolated building of the second construction period is constructed, if it is built integrally with the first seismic isolated building including the foundation, When an earthquake occurs in the building, torsional vibrations are generated in the building, and the natural period of the seismic isolation building during the construction period is shorter than when completed, so that the seismic isolation effect of the first seismic isolation building is weakened.
[0008]
The present invention has been made in view of the above circumstances, and when a seismic isolation building is added or when a seismic isolation building is constructed by dividing it into a plurality of construction periods, an earthquake occurs during the construction. Another object of the present invention is to provide an extension method of a seismic isolation building and a new construction method of a seismic isolation building that can reliably exhibit the seismic isolation operation.
[0009]
[Means for Solving the Problems]
In the method for extending a base-isolated building according to claim 1 of the present invention, a base-isolation device is installed on a base for a base-isolation device adjacent to an existing base-isolation building, and then the first building foundation is placed on the base-isolation device. The first base frame is constructed on the first building foundation to construct an extension seismic isolation building independent of the existing seismic isolation building, and then the building base of the existing seismic isolation building and the first The first building foundation is connected with the second building foundation, and then the second upper frame is constructed on the second building foundation, and the second upper frame is used as the upper frame of the existing base-isolated building and the It is a method of integrating with the first upper frame of the extension seismic isolation building.
[0010]
In addition, the method for constructing a base-isolated building according to claim 2 is a method for constructing a base-isolated building by dividing it into a plurality of construction periods, and each seismic building has a predetermined interval for each construction period. Opened and constructed independently, and after the construction of all seismic isolated buildings is completed, the building foundations of adjacent seismic isolated buildings are connected with the connected building foundation, and the upper frame is constructed on these connected building foundations. This is a method characterized by constructing one seismic isolation building.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the extension method of the seismic isolation building concerning this invention is demonstrated based on drawing. Note that the same components as those in FIGS. 6 and 7 are denoted by the same reference numerals and description thereof is omitted.
[0012]
First, as shown in FIG. 1, the base 18 for seismic isolation devices is formed so as to be continuous with the base 4 for seismic isolation devices of the existing base isolation building 2. Then, a plurality of seismic isolation devices 20 for extension buildings are installed on the base 18 for the seismic isolation device set.
[0013]
Next, as shown in FIG. 2, the first building foundation 22 is installed on the seismic isolation device 20 for the extension building. Here, the first building foundation 22 is installed at a predetermined interval S with respect to the building foundation 8 of the existing seismic isolation building 2. Then, by constructing the first upper frame 24 on the first building foundation 22, the extension seismic isolation building 26 independent of the existing seismic isolation building 2 is constructed.
[0014]
Next, as shown in FIG. 3, the building foundation 8 of the existing seismic isolation building 2 and the first building foundation 22 of the extension seismic isolation building 26 are connected by the second building foundation 28.
Next, as shown in FIG. 4, by constructing the second upper housing 30 on the second building foundation 28 and integrating with the upper housing 10 and the first upper housing 24 of the existing seismic isolation building 2, Extension of the existing seismic isolation building 2 is completed.
[0015]
According to the extension method of the seismic isolation building described above, the existing seismic isolation building 2 and the extension seismic isolation building 26 are independently constructed at the construction stage shown in FIG. The seismic device 6 reduces the shaking of the upper housing 10, and the seismic isolation device 20 reduces the shaking of the first upper housing 24 and sufficiently exhibits seismic isolation performance.
[0016]
FIG. 5 shows the construction stage of FIG. 3 in a plan view. By taking such construction procedures, construction is performed with the center of gravity of the upper frame and the seismic isolation layer's rigid center substantially matched in each construction stage. The torsional vibration is not generated in the building even if it receives the seismic force in the horizontal Y direction during construction.
[0017]
Moreover, even if it encounters a big earthquake in the middle of construction by separating from the existing base-isolated building 2, the existing base-isolated building 2 can exhibit the initial base isolation effect.
On the other hand, in the above embodiment, the method for extending the existing seismic isolation building 2 has been described. However, when the present invention is applied to a new seismic isolation building divided into a plurality of construction periods, Even if this occurs, the seismic isolation operation can be reliably performed.
[0018]
In other words, when one seismic isolation building is constructed by dividing it into multiple construction periods, the existing seismic isolation building 2 shown in FIG. The seismic building is constructed independently like the seismic isolation building 26 shown in FIG. And after building the seismic isolation building independently from the 1st construction period to the last construction period, the building foundation between the building foundations of each seismic isolation building is the same structure as the second building foundation 28 shown in FIG. Connect. Then, one seismic isolation building is constructed by constructing the upper frame on the foundation of the connected building.
[0019]
When one seismic isolation building is newly constructed by the above method, even if an earthquake occurs during the construction, the independently constructed seismic isolation building can reliably exhibit the seismic isolation operation.
[0020]
【The invention's effect】
As described above, according to the extension method of the base-isolated building according to claim 1, after building the extension base-isolated building independently of the existing base-isolated building, the building base of the existing base-isolated building and the extension base-isolated Since the second building foundation is connected to the first building foundation of the building, even if an earthquake occurs during the extension, the upper structure of the existing seismic isolation building, the second upper structure of the extension seismic isolation building In contrast, seismic isolation can be performed reliably.
[0021]
Moreover, according to the new construction method of the seismic isolation building according to claim 2, after each construction period, a plurality of seismic isolation buildings are independently constructed at predetermined intervals, and the construction of all the seismic isolation buildings is completed. Because the building foundations of adjacent seismic isolation buildings are connected to each other with a linked building foundation, even if an earthquake occurs in the middle of a new construction, the seismic isolation operation must be reliably performed on the upper frame of each seismic isolation building Can do.
[Brief description of the drawings]
FIG. 1 is a diagram showing a construction stage in which a base isolation device is installed on a base for a base isolation device set adjacent to an existing base isolation building.
FIG. 2 is a diagram showing a construction stage in which an extension seismic isolation building is constructed independently of an existing base isolation building.
FIG. 3 is a diagram showing a construction stage in which a building foundation of an existing base isolation building and a first building foundation of an extension base isolation building are connected by a second building foundation.
FIG. 4 is a diagram showing a state in which the extension of the base-isolated building is completed by constructing the second upper frame on the second building foundation.
FIG. 5 is a diagram showing the construction stage shown in FIG. 3 in a plan view.
FIG. 6 is a diagram showing a conventional method for extending a base-isolated building in plan view.
FIG. 7 is a side view of a conventional method of building a base-isolated building.
[Explanation of symbols]
2 Existing seismic isolation buildings 4 and 18 Bases for seismic isolation devices 6 and 20 Seismic isolation devices 8 Building foundations 10 Upper frame 22 First building foundation 24 First upper frame 26 Extension base isolation building 28 Second building foundation 30 2 Upper housing

Claims

The seismic isolation device is installed on the base for the seismic isolation device adjacent to the existing base isolation building, then the first building foundation is installed on the base isolation device, and the first upper frame is installed on the first building foundation. Constructing an extension seismic isolation building that is independent from the existing seismic isolation building, and then connecting the building foundation of the existing seismic isolation building and the first building foundation with a second building foundation; The second upper frame is constructed on the second building foundation, and the second upper frame is integrated with the upper frame of the existing base-isolated building and the first upper frame of the extension base-isolated building. How to extend the base-isolated building.

This is a method of constructing a new base-isolated building by dividing it into multiple construction periods, and constructing all the base-isolated buildings by constructing multiple base-isolated buildings independently at predetermined intervals in each construction period. After the construction is completed, the building foundations of adjacent seismic isolated buildings are connected with the connected building foundations, and the upper frame on these connected building foundations is constructed to construct one seismic isolated building. New construction method of seismic isolation building.