JP3690496B2

JP3690496B2 - Foundation structure of building and construction method of foundation

Info

Publication number: JP3690496B2
Application number: JP2000337304A
Authority: JP
Inventors: 佐藤　　一郎; 吉隆外狩; 和彦小林
Original assignee: Shimizu Corp
Current assignee: Shimizu Corp
Priority date: 2000-11-06
Filing date: 2000-11-06
Publication date: 2005-08-31
Anticipated expiration: 2020-11-06
Also published as: JP2002138496A

Description

【０００１】
【発明の属する技術分野】
本発明は、主に単層（平屋建て）ないし２〜３階建て程度の低層建築物の基礎構造および基礎の施工方法に関する。
【０００２】
【従来の技術】
建築物の基礎構造として、杭の上端部にフーチングを介して柱を接合して立設し、それら柱間に梁を架設し、かつ杭の上端部同士をつなぎ梁により連結するものが一般的であるが、より簡略で合理的な構造として、杭と柱とを直接的に接合してつなぎ梁およびフーチングを省略することが近年こころみられるようになった。この場合、柱としては主に鉄骨製のものが用いられていた。
【０００３】
【発明が解決しようとする課題】
上述した杭と柱とを直接的に接合する建築物の基礎構造は、施工性に優れておりコストも安価であるといった特徴を持っているが、柱がＲＣ構造のものへの適用は行われていなかった。柱がＲＣ構造の場合の上述した合理的な建築物の基礎構造の適用が求められていた。
【０００４】
【課題を解決するための手段】
請求項１の発明は、地中に鋼管杭を打ち込み、打ち込んだ鋼管杭の頭部に同軸状となるよう一体的に設けた鋼管の内部に柱の下端面の位置が鋼管杭と鋼管との接合面からずれるように柱用の鉄筋を配設し、次いで柱の下端面の位置が鋼管杭と鋼管との接合面からずれるように鋼管内にコンクリートを打設して鋼管杭の上部に一体的に接合された柱脚部を有する柱を立設することを特徴としている。
【０００５】
請求項２の発明は、地中に打ち込んだ鋼管杭の頭部に同軸状となるように鋼管が一体的に設けられ、柱の下端面の位置が鋼管杭と鋼管との接合面からずらされるように、該鋼管の内部に柱用の鉄筋が組み込まれた状態でコンクリートが打設されて、前記鋼管杭の頭部の上部と一体的に接合された柱脚部を有する柱が立設されてなることを特徴としている。
【０００６】
請求項３の発明は、請求項２記載の建築物の基礎構造において、前記鋼管の内周面にはスパイラル状のリブが形成されていることを特徴としている。
【０００７】
請求項４の発明は、請求項２また３記載の建築物の基礎構造において、前記鋼管の内側には該鋼管の円周面に沿って割裂防止筋が配設されていることを特徴としている。
【０００８】
【発明の実施の形態】
図１は本発明に係る建築物の実施形態を示す。図中、符号１は杭、３は柱である。図１から明らかなように、本実施形態の建築物では各杭１がそれぞれ独立に設けられていて、従来一般には各杭同士を連結するように設けられるつなぎ梁が省略されている。また、各杭１の上端部に各柱３が直接的に接合されており、従来一般には設けられるフーチングが省略されたものとなっている。
【０００９】
図２〜図３は要部の詳細を示すものである。図２に示すように杭１として中空鋼管杭２の上部には該中空鋼管杭２と同軸状に中空鋼管杭２と同径の筒体５が溶接等の適宜固定手段で一体的に設けられている。
【００１０】
また、ここでは筒体５として、例えば内周面にスパイラル状のリブ６が形成された、いわゆるスパイラル鋼管が用いられているが、必ずしもスパイラル鋼管に限られるものでなく、単なる鋼管であってもよい。さらには、杭１として用いた前記中空鋼管杭２の上部を利用してもよい。
【００１１】
筒体５の内部には、柱用の鉄筋９が配設されている。柱用の鉄筋９は、主筋とそのまわりのフープ筋からなっているが、図２ではフープ筋が省略されている。柱用の鉄筋９は筒体５の上部開口部７から上方へ突出して、所定高さまで伸びている。
【００１２】
前記筒体５の内側には、割裂防止筋１０が筒体５の円周面に沿って配設されている。さらに、これら筒体５内に柱用の鉄筋９および割裂防止筋１０が配設された状態で、筒体５内下部に図示しないコンクリート止めを設けてコンクリート８が打設されることにより、柱脚部４を杭１の頭部と一体的に接合された前記柱３が立設されている。
【００１３】
次に本発明の施工方法を示す。まず、地中に杭１を構成する中空鋼管杭２を打ち込む。次いで、中空鋼管杭２の上端部に筒体５を中空鋼管杭２と同軸状に接合する。また、筒体５は、中空鋼管杭２を打ち込む前に予め同中空鋼管杭２に接合しても良い。筒体５の内周部に沿って割裂防止筋１０を配設した上で、柱用の鉄筋９の下端部を筒体５の中空部に配置し、コンクリート８を打設して、筒体５と柱用の鉄筋を固定する。この後、図示せぬ柱用の他の鉄筋及び型枠を組み立てコンクリートを打設する。
【００１４】
上述の構成によれば、杭１と同径の筒体５を中空鋼管杭２と同軸状に接合し、筒体内の中空部に筒体５の略下半部まで至るようにコンクリート８を打設しているから、つまり中空鋼管杭２と筒体５との接合面１１を一致しないようにずらしているから、杭１と筒体５の接合部に生じやすい応力集中を回避して十分な接合強度を確保することができる。
【００１５】
また、筒体５の上端部に柱用の鉄筋９の下端部を配置するとともにコンクリート８を筒体５内に打設充填し、筒体５を介して杭１と柱３を直接的に接合しているから、杭１と柱３の十分な接合強度を確保することができる。
【００１６】
また、筒体５の内周面にスパイラル状のリブ６を形成しているため、該筒体５自体の強度が高まるのは勿論、その他筒体５と杭１、および柱３内にそれぞれ打設されるコンクリート８の定着強度を高めることができ、これにより杭１と柱３との接合強度を高めることができる。
【００１７】
さらに、筒体５の内周部に割裂防止筋１０を配置しているから、柱３から伝わる建築物の鉛直荷重により作用される筒体５の圧縮歪等の変形を防ぐことができる。
【００１８】
また、図３において柱３は角形となっているが、形状は角形および円形のいずれもが採用可能である。
【００１９】
【発明の効果】
請求項１の建築物の基礎の施工方法によれば、地中に鋼管杭を打ち込み、打ち込んだ鋼管杭の頭部に同軸状となるよう一体的に設けた鋼管の内部に柱用の鉄筋を配設し、次いで鋼管内にコンクリートを打設して鋼管杭の上部に一体的に接合された柱脚部を有する柱を接合するものであるから、いずれも簡略かつ合理的な構造で施工性に優れているため工費削減、工期短縮に大きく寄与するものであり、きわめて有効である。また、柱の下端面の位置が鋼管杭と鋼管との接合面からずれるように柱用の鉄筋を配設するとともに柱のコンクリートを打設するものであるから、鋼管杭と鋼管との接合部に生じやすい応力集中を回避して十分な接合強度を確保することができる。
【００２０】
請求項２の建築物の基礎構造によれば、地中に打ち込んだ鋼管杭の頭部に同軸状となるように鋼管が一体的に設けられ、柱の下端面の位置が鋼管杭と鋼管との接合面からずらされるように、該鋼管の内部に柱用の鉄筋が組み込まれた状態でコンクリートが打設されて、前記鋼管杭頭部の上部に一体的に接合された柱脚部を有する柱を構築されてなるから、鋼管杭と鋼管との接合部に生じやすい応力集中を回避して鋼管杭と柱との間に十分なる接合強度を確保できるため、柱にＲＣ構造のものを用いた場合についても鋼管杭と柱とを直接的に接合する建築物の基礎構造の適用が可能となった。
【００２１】
請求項３の建築物の基礎構造によれば、前記鋼管の内周面にはスパイラル状のリブが形成されていることから、鋼管自体の強度が高まるほか前記鋼管とコンクリートの充分なる定着強度が高まり、簡略な構造でＲＣ構造の柱と鋼管杭との応力伝達はスムーズに行われる。
【００２２】
請求項４の建築物の基礎構造によれば、前記鋼管の内側には該鋼管の円周面に沿って割裂防止筋が配筋されることから、建築物の柱等より鉛直荷重がかかることにより作用する該鋼管への圧縮歪等の変位を最小限にとどめ、鋼管の早期劣化を抑制することができる。
【図面の簡単な説明】
【図１】本発明に係る建築物の基礎構造を有する建築物の実施形態を示す概略構成図である。
【図２】本発明に係る建築物の基礎構造の実施形態を示す図である。
【図３】本発明に係る建築物の基礎構造の実施形態を示す断面図である。
【符号の説明】
１杭
２中空鋼管杭
３柱
４柱脚部
５筒体
６リブ
７上部開口部
８コンクリート
９柱用の鉄筋
１０割裂防止筋
１１接合面[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a basic structure of a single-layer (one-story building) or a low-rise building having about two to three floors and a construction method of the foundation.
[0002]
[Prior art]
As a basic structure of a building, it is common to connect a pillar to the upper end of a pile via a footing, build a beam between the pillars, and connect the upper end of the pile to each other by a beam However, in recent years, as a simpler and more rational structure, it has become an effort to join the piles and columns directly and omit the connecting beams and footings. In this case, steel columns were mainly used.
[0003]
[Problems to be solved by the invention]
The basic structure of a building that directly joins the above-mentioned piles and pillars is characterized by excellent workability and low cost. However, it is applied to pillars with RC structures. It wasn't. The application of the above-mentioned rational building foundation structure in the case where the column is an RC structure has been demanded.
[0004]
[Means for Solving the Problems]
In the invention of claim 1, the steel pipe pile is driven into the ground, and the position of the lower end surface of the column is formed between the steel pipe pile and the steel pipe inside the steel pipe integrally provided so as to be coaxial with the head of the driven steel pipe pile . Placing the reinforcing bars for the pillars so that they deviate from the joint surface , and then place concrete in the steel pipe so that the position of the lower end of the pillar deviates from the joint surface between the steel pipe pile and the steel pipe, and integrate it with the upper part of the steel pipe pile It is characterized in that a column having column bases joined together is erected.
[0005]
In the invention of claim 2, the steel pipe is integrally provided so as to be coaxial with the head of the steel pipe pile driven into the ground, and the position of the lower end surface of the column is shifted from the joint surface between the steel pipe pile and the steel pipe. as concrete in a state in which reinforcing bars are embedded in the internal pillar of the steel pipe is pouring, posts having a columnar leg portion top and integrally joined in a head of the steel pipe pile is erected It is characterized by.
[0006]
According to a third aspect of the present invention, there is provided the building basic structure according to the second aspect, wherein spiral ribs are formed on the inner peripheral surface of the steel pipe .
[0007]
A fourth aspect of the present invention, the basic structure of claim 2 or 3 buildings according to the inside of the steel pipe is characterized in that splitting prevent muscle along the circumferential surface of the steel pipe is arranged .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a building according to the present invention. In the figure, reference numeral 1 is a pile, and 3 is a pillar. As is clear from FIG. 1, each pile 1 is provided independently in the building of this embodiment, and conventionally, a connecting beam provided so as to connect the piles is omitted. Moreover, each pillar 3 is directly joined to the upper end part of each pile 1, The footing generally provided conventionally is abbreviate | omitted.
[0009]
2 to 3 show details of main parts. As shown in FIG. 2, a cylindrical body 5 having the same diameter as that of the hollow steel pipe pile 2 is integrally provided on the upper portion of the hollow steel pipe pile 2 as a pile 1 by an appropriate fixing means such as welding. ing.
[0010]
Further, here, for example, a so-called spiral steel pipe in which spiral ribs 6 are formed on the inner peripheral surface is used as the cylindrical body 5, but it is not necessarily limited to the spiral steel pipe, and may be a simple steel pipe. Good. Furthermore, you may utilize the upper part of the said hollow steel pipe pile 2 used as the pile 1. FIG.
[0011]
A column reinforcing bar 9 is disposed inside the cylinder 5. The column reinforcing bars 9 are composed of main bars and hoop bars around the main bars, but the hoop bars are omitted in FIG. The column reinforcing bars 9 protrude upward from the upper opening 7 of the cylinder 5 and extend to a predetermined height.
[0012]
Inside the cylinder 5, splitting prevention muscles 10 are arranged along the circumferential surface of the cylinder 5. Furthermore, in the state in which the reinforcing bars 9 and the splitting reinforcing bars 10 for the pillars are disposed in the cylinders 5, the concrete stoppers (not shown) are provided in the lower part in the cylinders 5 and the concrete 8 is driven, whereby the columns The column 3 in which the leg 4 is integrally joined to the head of the pile 1 is erected.
[0013]
Next, the construction method of the present invention is shown. First, a hollow steel pipe pile 2 constituting the pile 1 is driven into the ground. Next, the cylindrical body 5 is joined to the hollow steel pipe pile 2 coaxially with the upper end portion of the hollow steel pipe pile 2. Further, the cylindrical body 5 may be joined to the hollow steel pipe pile 2 in advance before the hollow steel pipe pile 2 is driven. After disposing the splitting reinforcing bars 10 along the inner peripheral part of the cylinder 5, the lower end of the column reinforcing bars 9 is arranged in the hollow part of the cylinder 5, and the concrete 8 is placed, and the cylinder 5 and rebar for the column are fixed. Thereafter, other reinforcing bars and molds for pillars (not shown) are assembled and concrete is placed.
[0014]
According to the above-described configuration, the cylinder 5 having the same diameter as the pile 1 is joined coaxially with the hollow steel pipe pile 2, and the concrete 8 is driven into the hollow portion of the cylinder so as to reach the substantially lower half of the cylinder 5. Since it has installed, that is, since the joining surface 11 of the hollow steel pipe pile 2 and the cylinder 5 is shifted so as not to coincide, it is sufficient to avoid stress concentration that tends to occur at the joint between the pile 1 and the cylinder 5. Bonding strength can be ensured.
[0015]
Further, the lower end portion of the column reinforcing bar 9 is disposed at the upper end portion of the cylindrical body 5 and the concrete 8 is cast and filled in the cylindrical body 5, and the pile 1 and the column 3 are directly joined via the cylindrical body 5. Therefore, sufficient joint strength between the pile 1 and the pillar 3 can be ensured.
[0016]
Further, since the spiral rib 6 is formed on the inner peripheral surface of the cylindrical body 5, not only the strength of the cylindrical body 5 itself is increased, but also the cylindrical body 5, the pile 1 and the pillar 3 are respectively struck. The fixing strength of the concrete 8 to be installed can be increased, whereby the bonding strength between the pile 1 and the column 3 can be increased.
[0017]
Furthermore, since the splitting prevention muscles 10 are arranged on the inner peripheral portion of the cylinder 5, it is possible to prevent deformation such as compressive strain of the cylinder 5 that is acted on by the vertical load of the building transmitted from the pillar 3.
[0018]
Further, in FIG. 3, the pillar 3 has a square shape, but any of a square shape and a circular shape can be adopted.
[0019]
【The invention's effect】
According to the construction method for a foundation of a building of claim 1, a steel pipe pile is driven into the ground, and a reinforcing bar for a column is provided inside the steel pipe integrally provided so as to be coaxial with the head of the driven steel pipe pile. Since the concrete is placed in the steel pipe and then the concrete is placed in the steel pipe pile to join the pillars with the column base part integrally joined to the upper part of the steel pipe pile , both work with a simple and rational structure. It is extremely effective because it greatly contributes to reducing the construction cost and shortening the construction period. Also, because the column rebar is placed so that the position of the lower end surface of the column deviates from the joint surface between the steel pipe pile and the steel pipe, and the concrete of the column is placed, the joint between the steel pipe pile and the steel pipe It is possible to avoid a stress concentration that is likely to occur in the film and to secure a sufficient bonding strength.
[0020]
According to the basic structure of the building of claim 2, the steel pipe is integrally provided so as to be coaxial with the head of the steel pipe pile driven into the ground, and the position of the lower end surface of the column is the steel pipe pile and the steel pipe. as offset from the joint surface of the concrete is pouring in a state in which reinforcing bars are embedded for pillars in the interior of the steel pipe, having a pedestal portion integrally joined to an upper portion of the steel pipe pile head Since the column is constructed, it is possible to avoid the stress concentration that tends to occur at the joint between the steel pipe pile and the steel pipe, and to ensure sufficient joint strength between the steel pipe pile and the column. It was also possible to apply building foundations that directly connect steel pipe piles and columns.
[0021]
According to the substructure of the building according to claim 3, since the an inner peripheral surface of the steel pipe is formed form the spiral ribs, sufficient Naru fixing strength of other said steel pipe and concrete strength of the steel pipe itself increases the The stress transmission between the RC structure column and the steel pipe pile is smoothly performed with a simple structure.
[0022]
According to the substructure of the building according to claim 4, inside the steel pipe from the splitting prevent muscle along the circumferential surface of the steel pipe is Haisuji, it takes a vertical load than the pillar or the like of a building minimizing displacement such as a compression strain to the steel pipe acting, it is possible to suppress premature deterioration of the steel pipe.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a building having a building foundation structure according to the present invention.
FIG. 2 is a diagram showing an embodiment of a building foundation structure according to the present invention.
FIG. 3 is a cross-sectional view showing an embodiment of a building foundation structure according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile 2 Hollow steel pipe pile 3 Column 4 Column base part 5 Tubular body 6 Rib 7 Upper opening part 8 Concrete 9 Reinforcing bar 10 Splitting prevention bar 11 Joint surface

Claims

The steel pipe pile is driven into the ground, and the column is placed inside the steel pipe that is integrally provided so as to be coaxial with the head of the driven steel pipe pile so that the position of the lower end surface of the column is displaced from the joint surface between the steel pipe pile and the steel pipe. The column base is placed on the top of the steel pipe pile by placing concrete in the steel pipe so that the position of the bottom end of the column is shifted from the joint surface between the steel pipe pile and the steel pipe. The construction method of the foundation of the building characterized by erecting the pillar which has a part.

Steel pipe is provided integrally so as to be coaxial to the head of the implanted's steel pipe pile into the ground, so that the position of the lower end surface of the column is displaced from the junction surface of the steel pipe pile and the steel pipe, the interior of the steel pipe The building is characterized in that concrete is cast in a state in which a reinforcing bar for a column is incorporated in the column, and a column having a column base part integrally joined to the upper part of the pile head is erected. Foundation structure.

The building foundation structure according to claim 2, wherein spiral ribs are formed on an inner peripheral surface of the steel pipe .

In basic structure according to claim 2 or 3 buildings according, substructure of a building that the inside of the steel pipe is characterized in that splitting prevent muscle along the circumferential surface of the steel pipe is disposed.