JP2013124511A - Building foundation structure, and building foundation construction method - Google Patents

Building foundation structure, and building foundation construction method Download PDF

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JP2013124511A
JP2013124511A JP2011274667A JP2011274667A JP2013124511A JP 2013124511 A JP2013124511 A JP 2013124511A JP 2011274667 A JP2011274667 A JP 2011274667A JP 2011274667 A JP2011274667 A JP 2011274667A JP 2013124511 A JP2013124511 A JP 2013124511A
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foundation
building
ground
piles
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Makoto Toriihara
誠 鳥井原
Fujio Harada
富士雄 原田
Takeshi Yamane
健 山根
Takeshi Nakamura
中村  剛
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Obayashi Corp
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PROBLEM TO BE SOLVED: To suppress costs and effectively prevent the settlement of a building.SOLUTION: A building foundation structure 10 includes plural wood piles 14 put into a ground 2 subjected to liquefaction countermeasures under a small building 1, and a foundation board 12 formed of lightweight cement-solidified soil on the plural wood piles 14. The specific gravity of the whole foundation structure 10 including the plural wood piles 14 and the foundation board 12 is less than 2.

Description

本発明は、建物の基礎構造及び建築物の基礎の構築方法に関する。   The present invention relates to a building foundation structure and a building foundation construction method.

一般的な液状化対策工法としては、密度増大工法、間隙水圧消散工法、固化工法、地下水位低下工法等が知られているが、これらの工法は大掛かりで高コストであるため、小規模建築物の液状化対策において採用されることは少なく、小規模建築物の液状化対策工法としては簡易なものが提案されている(例えば、非特許文献1参照)。非特許文献1に記載の小規模建築物の液状化対策工法は、小規模建築物の下の地盤の液状化を防止するというものではなく、液状化が発生しても小規模建築物の不同沈下を防止することを目標としているものである。   Common methods for liquefaction prevention include density increase method, pore water pressure dissipation method, solidification method, groundwater level lowering method, etc., but these methods are large and expensive, so small-scale buildings As a countermeasure for liquefaction of small-scale buildings, a simple method has been proposed (for example, see Non-Patent Document 1). The liquefaction countermeasure method for small-scale buildings described in Non-Patent Document 1 does not prevent the liquefaction of the ground under the small-scale building, but the small-scale buildings are not affected even if liquefaction occurs. The goal is to prevent settlement.

社団法人 日本建築学会 編集・著作・発行,「小規模建築物基礎設計指針」,2008年2月25日 第1版第1刷発行,p92The Architectural Institute of Japan Editorial, Publication, Publication, “Small Building Basic Design Guidelines”, February 25, 2008 First Edition, First Edition, p92

上述したように、小規模建築物の液状化対策工法は提案されてはいるが、如何にすればコストを抑えたうえで効果的に建物の沈下を抑えることができるかという段階まで検討されているわけではない。   As mentioned above, a liquefaction countermeasure method for small-scale buildings has been proposed, but it has been studied to the stage of how to effectively reduce the settlement of the building while reducing costs. I don't mean.

本発明は、上記事情に鑑みてなされたものであり、コストを抑えたうえで効果的に建物の沈下を抑えることを課題とするものである。   This invention is made | formed in view of the said situation, and makes it a subject to suppress the settlement of a building effectively, after suppressing cost.

上記課題を解決するために、本発明に係る建物の基礎構造は、建物下部の液状化対策の対象の地盤に打設された複数の杭と、前記複数の杭の上に構築された基礎盤とを備える建物の基礎構造であって、前記複数の杭は木杭であり、前記基礎盤は、軽量セメント固化土で構築され、前記複数の木杭と前記基礎盤とを含む基礎構造全体の比重が、液状化された地盤の比重未満であることを特徴とする。   In order to solve the above-mentioned problems, a foundation structure of a building according to the present invention includes a plurality of piles placed on a ground subject to liquefaction countermeasures at the bottom of the building, and a foundation foundation constructed on the plurality of piles. The plurality of piles are wooden piles, the foundation board is constructed of lightweight cement solidified soil, and the foundation structure as a whole includes the plurality of wooden piles and the foundation board. The specific gravity is less than the specific gravity of the liquefied ground.

前記建物の基礎構造は、前記複数の木杭の頭部を連結する連結材を備えてもよい。   The foundation structure of the building may include a connecting material that connects the heads of the plurality of wooden piles.

また、本発明に係る建物の基礎の構築方法は、建物下部の液状化対策の対象の地盤に杭を打設し、杭の上に基礎盤を構築する建物の基礎構造の構築方法であって、前記複数の杭を木杭とし、前記基礎盤を、軽量セメント固化土で構築し、前記複数の木杭と前記基礎盤とを含む基礎構造全体の比重を、液状化された地盤の比重未満とすることを特徴とする。   Further, the building foundation construction method according to the present invention is a building foundation construction method in which a pile is placed on the ground subject to liquefaction countermeasures at the bottom of the building, and the foundation board is constructed on the pile. The plurality of piles are wooden piles, the foundation is constructed of light cement solidified soil, and the specific gravity of the entire foundation structure including the plurality of wooden piles and the foundation is less than the specific gravity of the liquefied ground It is characterized by.

本発明によれば、コストを抑えたうえで効果的に建物の沈下を抑えることができる。   According to the present invention, it is possible to effectively suppress the settlement of a building while suppressing cost.

一実施形態に係る小規模建築物の基礎構造を示す立面図である。It is an elevation view which shows the basic structure of the small-scale building which concerns on one Embodiment. 基礎構造を構築する手順を示す図である。It is a figure which shows the procedure which builds a foundation structure. 基礎構造を構築する手順を示す図である。It is a figure which shows the procedure which builds a foundation structure. 基礎構造を構築する手順を示す図である。It is a figure which shows the procedure which builds a foundation structure. 液状化の発生時の作用を示す立面図である。It is an elevation which shows the effect | action at the time of generation | occurrence | production of liquefaction.

以下、本発明の一実施形態を、図面を参照しながら説明する。図1は、本発明の一実施形態に係る小規模建築物1の基礎構造10を示す立面図である。この図に示すように、基礎構造10は、小規模建築物1の下の液状化対策の対象の地盤2に構築される。ここで、小規模建築物とは、地上3階以下、建物高さ13m以下、軒高9m以下、及び延べ面積500m以下の条件を満足する比較的小規模な建築物をいう(上記非特許文献1のp1参照)。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevation view showing a foundation structure 10 of a small-scale building 1 according to an embodiment of the present invention. As shown in this figure, the foundation structure 10 is constructed on the ground 2 to be subjected to liquefaction countermeasures under the small-scale building 1. Here, the small-scale building means a relatively small-scale building that satisfies the conditions of 3 floors or less above the ground, a building height of 13 m or less, an eave height of 9 m or less, and a total area of 500 m 2 or less (the above non-patent document). (Refer p1 of literature 1).

基礎構造10は、地表面から約1mの深さに約0.4mの厚さで構築された基礎盤12と、基礎盤12の下の地盤に打設された長さ約4m、直径約18cmの複数の木杭14と、複数の木杭14の頭部を連結する連結材16とを備えている。基礎盤12の上に小規模建築物1が建てられており、基礎盤12及び複数の木杭14は小規模建築物1の荷重を受けている。また、地盤2の地下水位は、地表面から0.5m(GL−0.5m)の深さであり、基礎盤12は、地下水位よりも低位に構築されている。   The foundation structure 10 includes a foundation board 12 constructed at a depth of about 0.4 m at a depth of about 1 m from the ground surface, and a length of about 4 m and a diameter of about 18 cm placed on the ground below the foundation board 12. And a connecting member 16 that connects the heads of the plurality of wooden piles 14. The small-scale building 1 is built on the foundation board 12, and the foundation board 12 and the plurality of wooden piles 14 receive the load of the small-scale building 1. The groundwater level of the ground 2 is 0.5 m (GL-0.5 m) deep from the ground surface, and the foundation 12 is constructed lower than the groundwater level.

基礎盤12は、軽量セメント固化土で構築された平板である。ここで、軽量セメント固化土としては、例として、原料土(砂質土)とセメントと水と気泡を混合した気泡混合軽量土を用いて生成されたもの(FCB工法:気泡混合軽量盛土工法)が挙げられる。また、その他の例としては、EPSブロック、発泡ビーズ混合軽量土、気泡混合土、石炭灰・水砕スラグ、火山灰土等の軽量盛土材をセメントで固化させたものが挙げられる。なお、基礎盤12は、平版に限らず、井桁形状のものでもよい。   The base plate 12 is a flat plate constructed of lightweight cement solidified soil. Here, as light-weight cement solidified soil, as an example, it was generated using raw material soil (sandy soil), a bubble-mixed lightweight soil mixed with cement, water and bubbles (FCB method: bubble-mixed lightweight embankment method) Is mentioned. Other examples include light-weight embankment materials such as EPS blocks, foamed bead-mixed lightweight soil, bubble-mixed soil, coal ash / water granulated slag, volcanic ash soil, etc., solidified with cement. The foundation board 12 is not limited to a lithographic plate, but may have a cross-girder shape.

複数の木杭14は、約1.5mの間隔で縦横に配され、頭部は基礎盤12に埋設されている。   The plurality of wooden piles 14 are arranged vertically and horizontally at intervals of about 1.5 m, and the heads are embedded in the foundation board 12.

連結材16は、鉄筋であり、縦横に配された複数の木杭14の頭部を縦方向、横方向のみならず対角線方向にも連結する。また、連結材16は、木杭14の頭部と共に基礎盤12に埋設されている。なお、連結材16は、鉄筋に限らず、番線や金網等の複数の木杭14を一体化させることができるものであればよい。   The connecting material 16 is a reinforcing bar, and connects the heads of the plurality of wooden piles 14 arranged in the vertical and horizontal directions not only in the vertical and horizontal directions but also in the diagonal direction. Further, the connecting material 16 is embedded in the foundation board 12 together with the head of the wooden pile 14. The connecting member 16 is not limited to a reinforcing bar, and any connecting member 16 may be used as long as it can integrate a plurality of wooden piles 14 such as a wire or a wire mesh.

図2〜図4は、基礎構造10を構築する手順を示す図である。基礎構造10を構築する際には、まず、図2に示すように、地盤2を約1m掘削してから複数の木杭14をその頭部が掘削底面から突出するように打設する。そして、図3に示すように、複数の木杭14の頭部を連結材16で連結し、図4に示すように、木杭14の頭部及び連結材16が埋設されるように軽量セメント固化土を掘削底面上に約0.4mの厚さで打設する。   2-4 is a figure which shows the procedure which builds the foundation structure 10. As shown in FIG. When constructing the foundation structure 10, first, as shown in FIG. 2, after excavating the ground 2 by about 1 m, a plurality of wooden piles 14 are driven so that the heads protrude from the bottom of the excavation. Then, as shown in FIG. 3, the heads of the plurality of wooden piles 14 are connected by a connecting material 16, and the heads of the wooden piles 14 and the connecting material 16 are embedded as shown in FIG. Solidified soil is cast on the bottom of the excavation with a thickness of about 0.4 m.

ところで、上記非特許文献1には、小規模建築物を対象とした液状化判定では、200gal以下のL1地震(レベル1地震:住宅などの建築物の利用期間中に遭遇する可能性の高い地震)に対して地表面から5m(GL−5m)の深さまでを考慮すればよい旨、記載されている。そこで、本実施形態では、小規模建築物1の下の地盤2における地表面から約5mの範囲に、液状化対策を目的とした基礎構造10を構築している。   By the way, in the said nonpatent literature 1, in the liquefaction determination for small buildings, the L1 earthquake of 200 gal or less (level 1 earthquake: earthquake that is likely to be encountered during the period of use of buildings such as houses) ) To the depth of 5 m (GL-5 m) from the ground surface. Therefore, in this embodiment, the foundation structure 10 for the purpose of liquefaction countermeasures is constructed in a range of about 5 m from the ground surface in the ground 2 under the small-scale building 1.

ここで、「設計要領 第一集 土工編」(東日本高速道路株式会社、中日本高速道路株式会社、西日本高速道路株式会社 編集,株式会社高速道路総合技術研究所 発行,平成18年7月 初版発行)の1−43頁の表1−16に記載されているように、自然の砂地盤の単位体積重量が20kN/mであるのに対し、水の単位体積重量は10kN/mであることから、液状化した砂地盤は比重2程度の液体の性質を示すことになる。なお、砂が密実でなかったり、砂に礫が混じっていたり、密実でない砂質土であったりすると、砂地盤の単位体積重量が17〜21kN/mの範囲で変動することから、液状化した砂地盤の比重は1.7〜2.1というように変動する。また、液状化した地盤の比重については、1.7より小さくなる場合もある等、諸説がある。 Here, “Design Guideline 1st Earthwork” (Edited by East Japan Expressway Co., Ltd., Central Japan Expressway Co., Ltd., West Japan Expressway Co., Ltd., Expressway Technical Research Institute Co., Ltd., July 2006, first edition issued. ), The unit volume weight of natural sand ground is 20 kN / m 3 , whereas the unit volume weight of water is 10 kN / m 3 . Therefore, the liquefied sand ground exhibits a liquid property having a specific gravity of about 2. If the sand is not solid, if the sand is mixed with gravel, or if it is sandy soil that is not solid, the unit volume weight of the sand ground will fluctuate in the range of 17-21 kN / m 3 , The specific gravity of the liquefied sand ground varies from 1.7 to 2.1. There are various theories about the specific gravity of the liquefied ground, such as being less than 1.7.

そこで、本実施形態では、液状化した地盤が比重2程度の液体の性質を示すことに鑑み、図5に示すように、基礎構造10全体の比重を2未満として、基礎構造10に浮力Pを作用させ、小規模建築物1から地盤2に伝わる荷重Wを減少させることで、地盤2に液状化が発生した際の小規模建築物1の沈下を抑制する。以下、この点について実施例を挙げて説明する。   Therefore, in the present embodiment, considering that the liquefied ground exhibits the property of liquid having a specific gravity of about 2, as shown in FIG. By acting and reducing the load W transmitted from the small-scale building 1 to the ground 2, the settlement of the small-scale building 1 when liquefaction occurs in the ground 2 is suppressed. Hereinafter, this point will be described with reference to examples.

一実施例に係る小規模建築物1の平面の縦横の寸法、単位面積当たりの荷重、及び、全体の荷重は、夫々、7m×7m、10kN/m、490kNである。これに対して、基礎盤12の平面の縦横及び高さの寸法、比重、及び単位体積重量は、夫々、10m×10m×0.4m、1.0、10kN/mであり、49本の木杭14の寸法、比重、及び単位体積重量は、夫々、φ18cm×長さ4m、0.5、5kN/mである。また、液状化した砂地盤の比重、単位体積重量は、夫々、2.0、20kN/mである。 The vertical and horizontal dimensions of the plane of the small-scale building 1 according to an embodiment, the load per unit area, and the entire load are 7 m × 7 m, 10 kN / m 2 , and 490 kN, respectively. On the other hand, the vertical and horizontal dimensions and height dimensions, specific gravity, and unit volume weight of the base plate 12 are 10 m × 10 m × 0.4 m, 1.0, and 10 kN / m 3 , respectively. The size, specific gravity, and unit volume weight of the wooden pile 14 are φ18 cm × length 4 m, 0.5, and 5 kN / m 3 , respectively. The specific gravity and unit volume weight of the liquefied sand ground are 2.0 and 20 kN / m 3 , respectively.

当該実施例において、基礎盤12に作用する浮力P1は、400kN(=10m×10m×0.4m×(20kN/m−10kN/m))、49本の木杭14に作用する浮力P2は、74.8kN(=0.09m×0.09m×3.14×4m×(20kN/m−5kN/m)×49)であり、これらの合計(浮力P)は、474.9kNである。これに対して、小規模建築物1の荷重Wは490kNであるため、液状化の発生時に地盤2に対する上載荷重(W−P)は、15.2kN(=490kN−474.8kN)となる。 In this embodiment, the buoyancy P1 acting on the foundation 12 is 400 kN (= 10 m × 10 m × 0.4 m × (20 kN / m 3 −10 kN / m 3 )), the buoyancy P2 acting on the 49 wooden piles 14. Is 74.8 kN (= 0.09 m × 0.09 m × 3.14 × 4 m × (20 kN / m 3 −5 kN / m 3 ) × 49), and the sum of these (buoyancy P) is 474.9 kN. It is. On the other hand, since the load W of the small-scale building 1 is 490 kN, the load on the ground 2 (WP) when the liquefaction occurs is 15.2 kN (= 490 kN-474.8 kN).

以上説明したように、杭を木杭14とし、基礎盤12をセメント軽量固化土で構築することにより、基礎構造10全体の比重を、液状化した地盤2の比重(約2)よりも小さくすることで、液状化した地盤2から基礎構造10に浮力Pを作用させ、小規模建築物1から地盤2に伝わる荷重を減少させることで、地盤2に液状化が発生した際の小規模建築物1の沈下を抑制することができる。   As described above, the specific gravity of the entire foundation structure 10 is made smaller than the specific gravity (about 2) of the liquefied ground 2 by using the wooden pile 14 as the pile and constructing the foundation 12 with cement lightweight solidified soil. Therefore, the buoyancy P is applied to the foundation structure 10 from the liquefied ground 2 and the load transmitted from the small-scale building 1 to the ground 2 is reduced, so that the small-scale building when the liquefaction occurs in the ground 2 1 subsidence can be suppressed.

また、本実施形態に係る基礎構造10では、多数の木杭14を地盤2に打設し、それらの頭部に強固な基礎盤12を構築することにより、小規模建築物1の下の地盤2の一体性を高めることができ、地震時の地盤2のせん断変形を抑制することができる。従って、地盤2の液状化を抑制することができる。   In the foundation structure 10 according to the present embodiment, a large number of wooden piles 14 are placed on the ground 2, and a solid foundation 12 is built on the heads of the foundations 10. 2 can be enhanced, and shear deformation of the ground 2 during an earthquake can be suppressed. Therefore, liquefaction of the ground 2 can be suppressed.

また、剛性の高い基礎盤12が存在することにより、地盤2に液状化が発生した際の小規模建築物1の不同沈下を抑制することができる。   Further, the presence of the highly rigid foundation 12 can suppress the uneven settlement of the small-scale building 1 when the ground 2 is liquefied.

以上、本発明を実施するための形態について説明したが、上記実施形態は本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。本発明はその趣旨を逸脱することなく変更、改良され得るとともに、本発明にはその等価物も含まれる。   As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

また、上述の実施形態では、小規模建築物1の液状化対策を例に挙げて本発明を説明したが、上述の小規模建築物の条件に当てはまらない建築物の液状化対策にも本発明を適用できる。また、複数の杭の頭部を連結材で連結することは必須ではない。   In the above-described embodiment, the present invention has been described by taking the liquefaction countermeasure of the small-scale building 1 as an example. However, the present invention is also applied to the liquefaction countermeasure of the building that does not apply to the above-mentioned condition of the small-scale building. Can be applied. Moreover, it is not essential to connect the heads of a plurality of piles with a connecting material.

1 小規模建築物(建物)、2 地盤、10 基礎構造、12 基礎盤、14 木杭、16 連結材 1 Small building (building), 2 ground, 10 foundation structure, 12 foundation board, 14 wooden pile, 16 connecting material

Claims (3)

建物下部の液状化対策の対象の地盤に打設された複数の杭と、前記複数の杭の上に構築された基礎盤とを備える建物の基礎構造であって、
前記複数の杭は木杭であり、前記基礎盤は、軽量セメント固化土で構築され、
前記複数の木杭と前記基礎盤とを含む基礎構造全体の比重が、液状化された地盤の比重未満であることを特徴とする建物の基礎構造。
A foundation structure of a building comprising a plurality of piles placed on the ground subject to liquefaction measures at the bottom of the building, and a foundation board constructed on the plurality of piles,
The plurality of piles are wooden piles, and the foundation board is constructed of lightweight cement solidified soil,
The foundation structure of a building, wherein the specific gravity of the entire foundation structure including the plurality of wooden piles and the foundation board is less than the specific gravity of the liquefied ground.
前記複数の木杭の頭部を連結する連結材を備えることを特徴とする請求項1に記載の建物の基礎構造。   The building foundation structure according to claim 1, further comprising a connecting member that connects the heads of the plurality of wooden piles. 建物下部の液状化対策の対象の地盤に杭を打設し、杭の上に基礎盤を構築する建物の基礎構造の構築方法であって、
前記複数の杭を木杭とし、前記基礎盤を、軽量セメント固化土で構築し、
前記複数の木杭と前記基礎盤とを含む基礎構造全体の比重を、液状化された地盤の比重未満とすることを特徴とする建物の基礎の構築方法。
A method for constructing the foundation structure of a building by placing a pile on the ground subject to liquefaction measures at the bottom of the building and constructing a foundation on the pile,
The plurality of piles are wooden piles, and the foundation board is constructed of lightweight cement solidified soil,
A method for constructing a foundation of a building, wherein the specific gravity of the entire foundation structure including the plurality of wooden piles and the foundation is less than the specific gravity of the liquefied ground.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5494880B1 (en) * 2013-09-26 2014-05-21 株式会社タケウチ建設 Liquefaction countermeasure basic structure and liquefaction countermeasure construction method
JP5947929B1 (en) * 2015-01-29 2016-07-06 株式会社小野田産業 Completely disaster-prevented detached house

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6483716A (en) * 1987-09-24 1989-03-29 Serufuoomu Kenkyusho Kk Foundation work for building
JP2002105951A (en) * 2000-10-04 2002-04-10 Minoru Kureko Wooden pile structure
JP2002180476A (en) * 2000-12-11 2002-06-26 Yamax Corp Reinforcing structure for soft ground
JP2008101379A (en) * 2006-10-18 2008-05-01 Railway Technical Res Inst Supporting structure and construction method for structure foundation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6483716A (en) * 1987-09-24 1989-03-29 Serufuoomu Kenkyusho Kk Foundation work for building
JP2002105951A (en) * 2000-10-04 2002-04-10 Minoru Kureko Wooden pile structure
JP2002180476A (en) * 2000-12-11 2002-06-26 Yamax Corp Reinforcing structure for soft ground
JP2008101379A (en) * 2006-10-18 2008-05-01 Railway Technical Res Inst Supporting structure and construction method for structure foundation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5494880B1 (en) * 2013-09-26 2014-05-21 株式会社タケウチ建設 Liquefaction countermeasure basic structure and liquefaction countermeasure construction method
JP2015063866A (en) * 2013-09-26 2015-04-09 株式会社タケウチ建設 Base structure for counteracting liquefaction and construction method for counteracting liquefaction
JP5947929B1 (en) * 2015-01-29 2016-07-06 株式会社小野田産業 Completely disaster-prevented detached house

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