JP4657759B2 - Building pile foundation structure - Google Patents

Building pile foundation structure Download PDF

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JP4657759B2
JP4657759B2 JP2005051252A JP2005051252A JP4657759B2 JP 4657759 B2 JP4657759 B2 JP 4657759B2 JP 2005051252 A JP2005051252 A JP 2005051252A JP 2005051252 A JP2005051252 A JP 2005051252A JP 4657759 B2 JP4657759 B2 JP 4657759B2
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foundation
underground
building
footings
frame portion
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JP2006233630A (en
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晃三 服部
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Okumura Corp
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本発明は、掘削や土止めなどの工事において、排土量の削減、コストの低減、および工期短縮を図ることが可能な建物の杭基礎構造に関する。   The present invention relates to a pile foundation structure of a building capable of reducing the amount of soil removal, reducing the cost, and shortening the work period in construction such as excavation and earth retaining.

従来、建物の基礎構造の一部などにフーチングと呼ばれる拡大部あるいは板状の下部構造が用いられている。上方からの応力は、このフーチングを介して下方の地中などへ拡散されて伝達される。例えば、杭基礎の建物においては、基礎杭の杭頭上端面と１階柱の柱脚部との間、あるいは杭頭上端面と基礎梁の下端部との間の接合部分などにフーチングが設けられる。   Conventionally, an enlarged portion called a footing or a plate-like lower structure is used for a part of the basic structure of a building. The stress from above is diffused and transmitted to the ground below through this footing. For example, in a pile foundation building, a footing is provided between a pile head upper end surface of a foundation pile and a column base portion of a first-floor column, or a joint portion between a pile head upper end surface and a lower end portion of a foundation beam.

特許文献１に開示された技術は、軟弱地盤における建物の基礎工法に関するものであって、軟弱地盤の地表面から、基礎杭の上端に設けるフーチングの上面までの深さが、将来予想される地盤沈下量以上となるように、軟弱地盤から下層の硬質地盤に基礎杭を打設し、基礎杭の上端にフーチングを設けて、フーチングの上に柱を立設し、かつ、フーチングの上方を除く軟弱地盤の地表面にコンクリートを打設し、さらにフーチングの上方の埋設空間を除去可能な埋め込み材で埋めている。
特開２００１−３４８８８６号公報 The technology disclosed in Patent Document 1 relates to a foundation method for a building on soft ground, and the depth from the ground surface of the soft ground to the upper surface of the footing provided at the upper end of the foundation pile is expected in the future. Place the foundation pile from the soft ground to the lower hard ground so that the amount of subsidence will be more than it, provide the footing at the upper end of the foundation pile, stand the pillar on the footing, and exclude the upper part of the footing Concrete is cast on the ground surface of soft ground, and the buried space above the footing is buried with a removable material.
JP 2001-348886 A

ところで従来、図２に示すように、建物Ｂの地下に付設的に、例えば受水槽Ｒのような設備を設置するための地下空間Ｓが構築される場合があった。図２は、基礎杭９０ａ〜９０ｄによる杭基礎構造の建物Ｂであって、地下空間Ｓを区画形成する躯体部分（以下、地下躯体部分という）９１は、その四隅に立設される基礎柱９２と、基礎柱９２同士の間に構築されて地下空間Ｓの四方を囲繞する外壁を形成する基礎梁９３と、地下空間Ｓの底面をなす底版９４とから一体的に構成される。これら基礎柱９２や基礎梁９３、および底版９４は建物Ｂの構造躯体としても機能している。   Conventionally, as shown in FIG. 2, an underground space S for installing a facility such as a water receiving tank R, for example, may be constructed in the basement of a building B. FIG. 2 shows a building B having a pile foundation structure composed of foundation piles 90a to 90d. And a foundation beam 93 that is constructed between the foundation pillars 92 and forms an outer wall that surrounds the four sides of the underground space S, and a bottom plate 94 that forms the bottom surface of the underground space S. The foundation pillar 92, the foundation beam 93, and the bottom slab 94 also function as a structural frame of the building B.

また、地下躯体部分９１の四隅には、フーチング９５ｂ、９５ｃが付設されている。これら地下躯体部分９１に設けられるフーチング９５ｂ、９５ｃは、基礎柱９２の下部と基礎杭９０ｂ、９０ｃの杭頭との間の部分に構築され、その下面側は基礎杭９０ｂ、９０ｃの杭頭と、互いに接合されており、上部は基礎柱９２や基礎梁９３、底版９４と一体的に構築されている。これらのフーチング９５ｂ、９５ｃは、基礎柱９２や基礎杭９０ｂ、９０ｃの水平断面より大きな断面積を有する。   In addition, footings 95 b and 95 c are attached to the four corners of the underground frame portion 91. The footings 95b and 95c provided in these underground frame parts 91 are constructed in the part between the lower part of the foundation pillar 92 and the pile heads of the foundation piles 90b and 90c, and the lower surface side is the pile heads of the foundation piles 90b and 90c. The upper part is constructed integrally with the foundation column 92, the foundation beam 93, and the bottom plate 94. These footings 95b and 95c have a larger cross-sectional area than the horizontal cross section of the foundation pillar 92 and the foundation piles 90b and 90c.

また、建物Ｂの、地下空間Ｓが構築される根切りした部分以外の地盤Ｇに打設される基礎杭９０ａ、９０ｄの杭頭上面にも、上記と同様のフーチング９５ａ、９５ｄが設けられ、これらのフーチング９５ａ、９５ｄの上部には１階柱９６ａ、９６ｄが一体的に立設される。また、各基礎柱９２の上端にも１階柱が一体的に立設される。また、地下空間Ｓが構築される部分以外の地盤Ｇ上、および地下空間Ｓの天井部分には１階床スラブ９７が構築される。また、地下躯体部分９１の底版９４の上面には逆梁式の基礎小梁９８が４本設けられる。これらの基礎小梁９８は、建物Ｂの構造躯体としても機能する一方で、地下空間Ｓに設けられた受水槽Ｒを、架台Ｋを介して支持する受水槽基礎としても兼用されている。   In addition, footings 95a and 95d similar to the above are also provided on the pile head upper surfaces of the foundation piles 90a and 90d to be placed on the ground G other than the rooted portion where the underground space S is constructed. First floor pillars 96a and 96d are erected integrally with the upper portions of these footings 95a and 95d. In addition, a first-floor pillar is erected integrally at the upper end of each foundation pillar 92. Further, a first floor slab 97 is constructed on the ground G other than the part where the underground space S is constructed and on the ceiling part of the underground space S. Also, four reverse beam-type foundation beam 98 are provided on the upper surface of the bottom slab 94 of the underground frame portion 91. These foundation beams 98 also function as a structural frame of the building B, and are also used as a water receiving tank foundation that supports the water receiving tank R provided in the underground space S via the gantry K.

ところがこのような従来の技術にあっては、地下躯体部分９１に設けられるフーチング９５ｂ、９５ｃは、地下躯体部分９１から突出していた。すなわち、フーチング９５ｂ、９５ｃの底面は、底版９４の下面よりも下方に位置していた。その結果、地下空間Ｓを構築する施工の際、フーチング９５ｂ、９５ｃが設けられる箇所においては、地下躯体部分９１の底面レベルよりも深く、すなわちフーチング９５ｂ、９５ｃの底面レベルまで掘削を行う必要があり、かつまた土止め壁の構築を行う必要があった。その結果、掘削時の排土量も増大し、土止め壁構築のためのコストも大きくなり、かつまたそれらの施工にかかる工期も長くなってしまうという課題があった。   However, in such a conventional technique, the footings 95 b and 95 c provided in the underground skeleton part 91 protrude from the underground skeleton part 91. That is, the bottom surfaces of the footings 95b and 95c are located below the bottom surface of the bottom plate 94. As a result, when constructing the underground space S, it is necessary to perform excavation deeper than the bottom surface level of the underground frame portion 91, that is, to the bottom surface level of the footings 95b and 95c, at locations where the footings 95b and 95c are provided. And again, it was necessary to construct a retaining wall. As a result, there has been a problem that the amount of soil discharged during excavation increases, the cost for constructing the retaining wall increases, and the construction period for the construction becomes longer.

本発明は上記従来の課題に鑑みて創案されたものであって、掘削や土止めなどの工事において、排土量の削減、コストの低減、および工期短縮を図ることが可能な建物の杭基礎構造を提供することを目的とする。   The present invention was devised in view of the above-described conventional problems, and is a building pile foundation capable of reducing the amount of soil removal, cost, and construction period in construction such as excavation and earth retaining. The purpose is to provide a structure.

本発明にかかる建物の杭基礎構造は、基礎梁や基礎柱、底版を備えて地下空間を区画形成する地下躯体部分に、フーチングが付設された建物の杭基礎構造において、上記フーチングは、底面が上記地下躯体部分の底面をなす上記底版の下面と面一に、かつ外側面が該地下躯体部分の外壁を形成する上記基礎梁の外側面と面一に、当該地下躯体部分と一体的に構築されると共に、上記地下空間に設けられる設備の支持位置に対応させて上記地下躯体部分より内方へ突出されることを特徴とする。 The pile foundation structure of a building according to the present invention is a pile foundation structure of a building in which a footing is attached to an underground frame portion that forms a basement space with a foundation beam, a foundation column, and a bottom slab. Constructed integrally with the underground frame part, flush with the bottom surface of the bottom slab forming the bottom of the underground frame part, and with the outer surface flush with the outer surface of the foundation beam forming the outer wall of the underground frame part And projecting inward from the underground frame portion in correspondence with the support position of the equipment provided in the underground space .

また、前記地下躯体部分は、逆梁式の基礎小梁を有し、該基礎小梁に前記設備が支持されることを特徴とする。   In addition, the underground frame portion has an inverted beam-type foundation beam, and the facility is supported by the foundation beam.

本発明にかかる建物の杭基礎構造にあっては、掘削や土止めなどの工事において、排土量の削減、施工コストの低減、および工期短縮を図ることが可能である。具体的には、フーチングが設けられる箇所においても、地下躯体部分の底面レベルよりも深い位置まで、そしてまた、地下躯体部分の外側面よりも外方まで、掘削や土止め壁の構築を行う必要がないため、それらの工事が容易であるとともに、掘削時の排土量の削減や、土止め壁にかかるコストの低減、および工期短縮を図ることが可能である。また、フーチングは、地下空間に設けられる設備の支持位置に対応させて、これを支持するように地下躯体部分より内方へ突出されることとしたので、設備の基礎として兼用することができる。その結果、基礎小梁などにかかるコストの低減を図ることが可能であるとともに、比較的重量の大きい設備に対する、より強固な基礎を構築することが可能となる。
In the pile foundation structure of a building according to the present invention, it is possible to reduce the amount of soil removal, the construction cost, and the work period in construction such as excavation and earth retaining. Specifically, at locations where footings are provided, it is necessary to excavate and construct earth retaining walls to a position deeper than the bottom surface level of the underground skeleton part and to the outside of the outer surface of the underground skeleton part. Therefore, it is easy to carry out such work, and it is possible to reduce the amount of soil discharged during excavation, reduce the cost of the retaining wall, and shorten the construction period. Moreover, since the footing is made to protrude inward from the underground skeleton part so as to support the support position of the equipment provided in the underground space, it can also be used as the basis of the equipment. As a result, it is possible to reduce the cost for the foundation beam, and to construct a stronger foundation for a relatively heavy facility.

以下に、本発明にかかる建物の杭基礎構造の好適な一実施形態を、添付図面を参照して詳細に説明する。本実施形態にかかる建物Ｂの杭基礎構造は、図１にその要部を示すように、地中に打設される基礎杭１ａ〜１ｄや、各基礎杭１ａ〜１ｄの上方に立設される１階柱２ａ〜２ｄや、これら基礎杭１ａ〜１ｄや１階柱２ａ〜２ｄを水平方向に一体化するように地盤Ｇ上に打設される１階床スラブ３などから構成されている。地盤Ｇの一部は掘削され根切りされて、そこには地下空間Ｓを区画形成するための地下躯体部分４が構築されている。   EMBODIMENT OF THE INVENTION Below, suitable one Embodiment of the pile foundation structure of the building concerning this invention is described in detail with reference to an accompanying drawing. The pile foundation structure of the building B according to this embodiment is erected above the foundation piles 1a to 1d and the foundation piles 1a to 1d that are placed in the ground, as shown in FIG. The first floor pillars 2a to 2d, and the foundation piles 1a to 1d and the first floor pillars 2a to 2d are composed of a first floor slab 3 placed on the ground G so as to be integrated in the horizontal direction. . A part of the ground G is excavated and rooted, and an underground frame portion 4 for partitioning the underground space S is constructed there.

地下空間Ｓを形成すべく根切りされた部分の地盤Ｇの四隅には基礎杭１ｂ、１ｃが打設されており、地下躯体部分４は、これら根切り部分の基礎杭１ｂ、１ｃの上方に立設される基礎柱５と、基礎柱５同士の間に構築されて地下空間Ｓの四方を囲繞する外壁を形成する基礎梁６と、地下空間Ｓの底面をなす底版７とから一体的に構成される。これら基礎柱５や基礎梁６、および底版７は建物Ｂの構造躯体としても機能している。なおここで「基礎柱」とは、建築物の構造体の地中部分に立設されて、基礎梁と接合される柱をいう。   Foundation piles 1b and 1c are placed in the four corners of the ground G of the part that has been rooted to form the underground space S, and the underground frame part 4 is located above the foundation piles 1b and 1c of the root part. From the standing pillar 5, the foundation beam 6 that is constructed between the foundation pillars 5 and forms an outer wall surrounding the four sides of the underground space S, and the bottom plate 7 that forms the bottom surface of the underground space S Composed. These foundation columns 5, foundation beams 6, and bottom slab 7 also function as a structural frame of the building B. Here, the “foundation pillar” means a pillar that is erected in the underground part of the structure of the building and joined to the foundation beam.

底版７の上面には、逆梁式の基礎小梁８が、それぞれ基礎梁６間に渡して立設されている。これら基礎小梁８の上面は、互いにおよそ同一レベルに形成されており、その上に、鉄骨材などからなる架台Ｋを介し、地下空間Ｓに設けられる設備としての受水槽Ｒが載置されている。すなわちこれら基礎小梁８は、建物Ｂの構造躯体として機能する一方で、受水槽Ｒの基礎としても兼用されている。   On the upper surface of the bottom slab 7, reverse beam-type foundation beam 8 is erected between the foundation beams 6. The upper surfaces of the foundation beam 8 are formed at approximately the same level, and a water receiving tank R as a facility provided in the underground space S is placed thereon via a gantry K made of steel frame or the like. Yes. That is, these foundation beam 8 functions as a structural frame of the building B, and is also used as a foundation of the water receiving tank R.

各基礎杭１ａ〜１ｄの杭頭にはいずれも、基礎柱５や基礎杭１ａ〜１ｄの水平断面より断面積の大きい拡大部であるフーチング９ａ〜９ｄが構築されている。建物Ｂの上方からの応力は、これらのフーチング９ａ〜９ｄを介して下方の地中などへ拡散されて伝達される。根切り部分以外の地盤Ｇに打設された基礎杭１ａ、１ｄの杭頭には、互いに接合されてフーチング９ａ、９ｄが構築されており、これらのフーチング９ａ、９ｄの上部には１階柱２ａ、２ｄの柱脚部が一体的に立設されている。他方、根切り部分の四隅の地中に打設された基礎杭１ｂ、１ｃの杭頭にもフーチング９ｂ、９ｃが構築されるが、これら地下躯体部分４に設けられるフーチング９ｂ、９ｃは、基礎柱５や基礎梁６、および底版７と一体的に構築されている。   Footings 9a to 9d, which are enlarged portions having a larger cross-sectional area than the horizontal cross sections of the foundation pillar 5 and the foundation piles 1a to 1d, are constructed on the pile heads of the foundation piles 1a to 1d. Stress from above the building B is diffused and transmitted to the ground below through these footings 9a to 9d. The pile heads of the foundation piles 1a and 1d placed on the ground G other than the root cutting portion are joined to each other to form footings 9a and 9d, and the first floor pillars are located above these footings 9a and 9d. The column base portions 2a and 2d are erected integrally. On the other hand, footings 9b and 9c are also built on the pile heads of foundation piles 1b and 1c that are placed in the ground at the four corners of the root cutting part. The footings 9b and 9c provided in these underground frame parts 4 are the foundations. The column 5, the foundation beam 6, and the bottom plate 7 are integrally formed.

後者の、地下躯体部分４に付設されるフーチング９ｂ、９ｃの底面は、底版７の下面、すなわち地下躯体部分４の底面と面一に構築されている。他方、これらのフーチング９ｂ、９ｃの上面は、底版７の上面よりも上方へ突出しており、基礎小梁８の上面と略同一レベルに形成されている。   The bottom surfaces of the latter footings 9b, 9c attached to the underground frame portion 4 are constructed flush with the bottom surface of the bottom plate 7, that is, the bottom surface of the underground frame portion 4. On the other hand, the upper surfaces of these footings 9 b and 9 c protrude upward from the upper surface of the bottom plate 7, and are formed at substantially the same level as the upper surface of the foundation beam 8.

また、これらのフーチング９ｂ、９ｃの外側面は、基礎梁６の外側面、すなわち地下躯体部分４の外側面と面一に構築されている。他方、これらのフーチング９ｂ、９ｃの内側は、受水槽Ｒの支持位置に対応させて、すなわち受水槽Ｒが載置される架台Ｋを支持すべく、地下躯体部分４の内方へ突出されており、その結果、建物Ｂの構造躯体としても機能する一方で、基礎小梁８とともに受水槽Ｒの基礎として兼用されている。   The outer surfaces of these footings 9b, 9c are constructed flush with the outer surface of the foundation beam 6, that is, the outer surface of the underground frame portion 4. On the other hand, the inner side of these footings 9b and 9c is projected inward of the underground frame portion 4 so as to correspond to the support position of the water receiving tank R, that is, to support the gantry K on which the water receiving tank R is placed. As a result, while functioning as a structural frame of the building B, it is also used as the foundation of the water receiving tank R together with the foundation beam 8.

次に、本実施形態にかかる建物Ｂの杭基礎構造の施工方法について説明する。本実施形態の建物Ｂを構築するには、まず地下空間Ｓを区画形成する地下躯体部分４を設ける箇所（根切り部分）の地盤の四隅、および根切り部分以外の地盤Ｇに基礎杭１ａ〜１ｄを打設し、全ての基礎杭１ａ〜１ｄの杭頭にフーチング９ａ〜９ｄを構築する。次に、根切り部分の周囲に土止め壁（図示省略）を構築する。次に、根切り部分を掘削（根切り）し、その後、根切り部分のフーチング９ｂ、９ｃの上部に一体的に、基礎柱５、基礎梁６、および底版７が構築される。底版７の上面には逆梁式の基礎小梁８が２本構築される。   Next, the construction method of the pile foundation structure of the building B concerning this embodiment is demonstrated. In order to construct the building B of the present embodiment, first, the foundation piles 1a to 4a are formed at the four corners of the ground where the underground frame portion 4 that forms the underground space S is provided (root cutting portion) and the ground G other than the root cutting portion. 1d is placed, and footings 9a to 9d are constructed on the pile heads of all foundation piles 1a to 1d. Next, a retaining wall (not shown) is constructed around the root cutting portion. Next, the root cutting part is excavated (root cutting), and then the foundation column 5, the foundation beam 6, and the bottom plate 7 are built integrally on the upper part of the footings 9b and 9c of the root cutting part. On the upper surface of the bottom plate 7, two reverse beam-type foundation beam 8 are constructed.

基礎小梁８の上面、および地下躯体部分４のフーチング９ｂ、９ｃの上面には、架台Ｋを介して受水槽Ｒが載置される。また、地盤Ｇ上には１階床スラブ３が打設され、根切り部分以外のフーチング９ａ、９ｄの上部、および基礎柱５の上部には１階柱２ａ〜２ｄの柱脚部が一体的に立設される。   A water receiving tank R is placed on the upper surface of the base beam 8 and the upper surfaces of the footings 9b and 9c of the underground frame portion 4 via the gantry K. Further, the first floor slab 3 is placed on the ground G, and the column bases of the first floor columns 2a to 2d are integrated with the upper portions of the footings 9a and 9d other than the root cutting portion and the upper portion of the foundation column 5. Established.

以上説明したように、本実施形態にかかる建物Ｂの杭基礎構造にあっては、基礎梁６や基礎柱５、底版７を備えて地下空間Ｓを区画形成する地下躯体部分４に付設されるフーチング９ｂ，９ｃは、底面が地下躯体部分４の底面をなす底版７の下面と面一に、かつ外側面が地下躯体部分４の外壁を形成する基礎梁６の外側面と面一に、当該地下躯体部分４と一体的に構築されることとしたので、これらのフーチング９ｂ、９ｃが地下躯体部分４よりも下方に突出しない構造となっている。その結果、フーチング９ｂ、９ｃが設けられる箇所においても、地下躯体部分４の底面レベルよりも深い位置まで、掘削や土止め壁の構築を行う必要がないため、掘削時の排土量の削減や、土止め壁にかかるコストの低減、および工期短縮を図ることが可能である。
As explained above, in the pile foundation structure of the building B according to the present embodiment, it is attached to the underground frame portion 4 that includes the foundation beam 6, the foundation pillar 5, and the bottom slab 7 and forms the underground space S. The footings 9b, 9c are flush with the lower surface of the bottom plate 7 whose bottom surface forms the bottom surface of the underground frame portion 4, and the outer surface is flush with the outer surface of the foundation beam 6 forming the outer wall of the underground frame portion 4. Since it is constructed integrally with the underground skeleton part 4 , these footings 9 b and 9 c have a structure that does not protrude below the underground skeleton part 4. As a result, it is not necessary to perform excavation or construction of a retaining wall to a position deeper than the bottom surface level of the underground frame portion 4 even at the location where the footings 9b and 9c are provided. It is possible to reduce the cost for the earth retaining wall and shorten the construction period.

他方、地下空間Ｓの水平方向について見てみると、本実施形態にかかる建物Ｂの杭基礎構造では、フーチング９ｂ、９ｃが地下躯体部分４の外側面と面一に構築されることとしたので、フーチング９ｂ、９ｃの箇所においても、地下躯体部分４の外側面よりも外方まで掘削や土止め壁の構築を行う必要がないため、それらの工事が容易であるとともに、掘削時の排土量の削減や、土止めにかかるコストの低減、および工期短縮を図ることが可能である。   On the other hand, looking at the horizontal direction of the underground space S, in the pile foundation structure of the building B according to this embodiment, the footings 9b and 9c are constructed to be flush with the outer surface of the underground frame portion 4. In addition, since it is not necessary to perform excavation and construction of a retaining wall outside the outer surface of the underground frame portion 4 at the locations of the footings 9b and 9c, the construction is easy and the earth excavation during excavation is performed. It is possible to reduce the amount, reduce the cost of the earth retaining, and shorten the construction period.

また、フーチングは、地下空間Ｓに設けられる設備である受水槽Ｒの支持位置に対応させて、これを支持するように地下躯体部分４より内方へ突出されることとしたので、受水槽Ｒの基礎として兼用することができる。その結果、基礎小梁８などにかかるコストの低減を図ることが可能であるとともに、比較的重量の大きい設備である受水槽Ｒに対する、より強固な基礎を構築することが可能となる。   Moreover, since the footing was made to protrude inward from the underground frame part 4 so as to support the water receiving tank R, which is a facility provided in the underground space S, so as to support it, the water receiving tank R It can also be used as a basis for As a result, it is possible to reduce costs for the foundation beam 8 and the like, and it is possible to construct a stronger foundation for the water receiving tank R which is a relatively heavy facility.

また、地下躯体部分４は、底版７の上面に逆梁式の基礎小梁８を有し、基礎小梁８に受水槽Ｒが支持されることとしたので、構造躯体である基礎小梁８を受水槽Ｒの基礎として兼用することができる。その結果、図２に示したような従来技術に比して、コストを増大させることなく、比較的重量の大きい設備である受水槽Ｒに対する、遜色のない強固な基礎を構築することが可能となる。   Further, the underground frame portion 4 has the reverse beam-type foundation beam 8 on the upper surface of the bottom slab 7, and the water receiving tank R is supported by the foundation beam 8, so the foundation beam 8 which is a structural frame. Can also be used as the foundation of the water receiving tank R. As a result, it is possible to construct a solid foundation that is comparable to the water receiving tank R, which is a relatively heavy facility, without increasing the cost as compared with the prior art as shown in FIG. Become.

本発明の一実施形態を示す、建物Ｂの杭基礎構造の要部縦断面図である。It is a principal part longitudinal cross-sectional view of the pile foundation structure of the building B which shows one Embodiment of this invention. 従来の建物Ｂの杭基礎構造を示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows the pile foundation structure of the conventional building B.

符号の説明Explanation of symbols

４ 地下躯体部分
５ 基礎柱
６ 基礎梁
７ 底版
８ 基礎小梁
９ｂ、９ｃ フーチング
Ｂ 建物
Ｒ 受水槽
Ｓ 地下空間 4 Base frame part 5 Foundation column 6 Foundation beam 7 Bottom plate 8 Foundation beam 9b, 9c Footing B Building R Receiving tank S Underground space

Claims (2)

基礎梁や基礎柱、底版を備えて地下空間を区画形成する地下躯体部分に、フーチングが付設された建物の杭基礎構造において、
上記フーチングは、底面が上記地下躯体部分の底面をなす上記底版の下面と面一に、かつ外側面が該地下躯体部分の外壁を形成する上記基礎梁の外側面と面一に、当該地下躯体部分と一体的に構築されると共に、上記地下空間に設けられる設備の支持位置に対応させて上記地下躯体部分より内方へ突出されることを特徴とする建物の杭基礎構造。 In the pile foundation structure of a building where footings are attached to the underground frame part that forms the underground space with foundation beams, foundation columns, and bottom plates,
The footing is arranged such that the bottom surface is flush with the lower surface of the bottom slab forming the bottom surface of the underground frame portion, and the outer surface is flush with the outer surface of the foundation beam forming the outer wall of the underground frame portion. A pile foundation structure for a building which is constructed integrally with a portion and protrudes inward from the underground frame portion in correspondence with a support position of equipment provided in the underground space . 前記地下躯体部分は、逆梁式の基礎小梁を有し、該基礎小梁に前記設備が支持されることを特徴とする請求項１に記載の建物の杭基礎構造。 2. The pile foundation structure of a building according to claim 1, wherein the underground frame portion has a reverse beam-type foundation beam, and the facility is supported by the beam.
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