JP2016061118A - Joint structure between pile and column - Google Patents

Joint structure between pile and column Download PDF

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JP2016061118A
JP2016061118A JP2014191935A JP2014191935A JP2016061118A JP 2016061118 A JP2016061118 A JP 2016061118A JP 2014191935 A JP2014191935 A JP 2014191935A JP 2014191935 A JP2014191935 A JP 2014191935A JP 2016061118 A JP2016061118 A JP 2016061118A
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pile
column
head
reinforcing bar
joint structure
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JP6412754B2 (en
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考文 熊谷
Takafumi Kumagai
考文 熊谷
西崎 隆氏
Takashi Nishizaki
隆氏 西崎
信行 柳澤
Nobuyuki Yanagisawa
信行 柳澤
邦江 池内
Kunie Ikeuchi
邦江 池内
一高 小島
Kazutaka Kojima
一高 小島
浩司 田渕
Koji Tabuchi
浩司 田渕
史朗 大須賀
Fumiaki Osuga
史朗 大須賀
知宏 九里
Tomohiro Kuri
知宏 九里
伊藤 剛
Takeshi Ito
伊藤  剛
愛三 西松
Aizo Nishimatsu
愛三 西松
良一 鶴田
Ryoichi Tsuruta
良一 鶴田
直子 葛山
Naoko Katsurayama
直子 葛山
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Takenaka Komuten Co Ltd
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Takenaka Komuten Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To resolve a problem with conventional joint structures between a pile and a column for enhancing workability, the conventional joint structures including one that connects a pile head part and a column head part with a footing in between, where the footing encloses many types of reinforcing bars such as a pile head reinforcing bar, a main column reinforcing bar, a main tension reinforcing bar, and a shear reinforcing bar that are arranged densely or intersect in a complicated way, as a result making construction processes burdensome.SOLUTION: A joint structure 10 between a pile and a column includes a pile 12 buried in a ground 16, and a concrete column 14 having a main column reinforcing bar 22 arranged to surround a head part 26 of the pile and connected with the pile by having the head part of the pile embedded in a leg part 28 of the column.SELECTED DRAWING: Figure 1

Description

本発明は、杭と柱の接合構造に関する。   The present invention relates to a joint structure between a pile and a column.

杭と柱の接合構造として、フーチングを介して杭頭部と柱脚部を接合する構造がある。例えば、特許文献1には、主鉄筋を介して場所打ちRC杭にフーチングが接合された接合構造が開示されている。   As a joint structure between a pile and a column, there is a structure in which a pile head and a column base are joined through a footing. For example, Patent Document 1 discloses a joint structure in which a footing is joined to a cast-in-place RC pile via a main reinforcing bar.

しかし、フーチングには、杭頭補強筋、柱主筋、梁主筋、せん断補強筋等の鉄筋が混在し、これらの鉄筋が密に配置されたり、複雑に交錯して配置されたりするために、施工手間がかかる。また、杭が正規の平面位置からずれて施工されてしまった場合、これらの配筋作業がさらに困難になる。   However, in the footing, reinforcing bars such as pile head reinforcing bars, column main bars, beam main bars and shear reinforcing bars are mixed, and these reinforcing bars are arranged densely or in a complicated manner. It takes time and effort. Moreover, when the pile has been constructed with a deviation from the regular plane position, these bar arrangement work becomes more difficult.

特開2006−299760号公報JP 2006-299760 A

本発明は係る事実を考慮し、杭と柱を接合する接合構造の施工性を向上させることを課題とする。   This invention considers the fact which concerns, and makes it a subject to improve the workability of the joining structure which joins a pile and a column.

第1態様の発明は、地盤に埋設された杭と、前記杭の頭部を取り囲むように柱主筋が配置され、前記杭の頭部が脚部に埋設されて前記杭と接合されたコンクリート製の柱と、を有する杭と柱の接合構造である。   The invention of the first aspect is a concrete product in which a pillar embedded in a ground and a column main bar are arranged so as to surround the head of the pile, and the head of the pile is embedded in a leg and joined to the pile. It is the joining structure of a pile and a pillar which has no pillar.

第1態様の発明では、柱の脚部における杭の頭部を取り囲む部分と、杭の頭部を取り囲むように配置された柱主筋とによって、柱に生じるせん断力を杭へ伝達し、杭と柱を接合することができる。   In the first aspect of the invention, the portion surrounding the head of the pile in the leg of the column and the column main reinforcement arranged so as to surround the head of the pile transmit the shearing force generated in the column to the pile, Columns can be joined.

また、杭の頭部を柱の脚部に埋設した接合構造により、柱の脚部をピン接合として建物の上部構造を設計し、杭の頭部をピン接合として杭の設計を行うことができる。これにより、杭と柱の接合部に曲げモーメントが生じることを抑制でき、杭と柱の接合部はせん断力の伝達を主に担えばよくなる。よって、杭と柱の接合部に、柱の柱主筋及びせん断補強筋以外の鉄筋を配置する必要がなくなり、簡単な接合構造によって杭と柱を接合することができるので、杭と柱を接合する接合構造の施工性を向上させることができる。   Also, with the joint structure in which the head of the pile is embedded in the leg of the column, the upper structure of the building can be designed with the leg of the column as the pin joint, and the pile can be designed with the head of the pile as the pin joint . Thereby, it can suppress that a bending moment arises in the junction part of a pile and a column, and the junction part of a pile and a column will have to mainly bear transmission of shearing force. Therefore, it is not necessary to arrange reinforcing bars other than the column main reinforcement and shear reinforcement of the column at the joint between the pile and the column, and the pile and the column can be bonded with a simple bonding structure. The workability of the joint structure can be improved.

第2態様の発明は、第1態様の杭と柱の接合構造において、前記杭の頭部から上方へ突出して設けられた杭頭補強筋が前記柱の脚部に埋設されている。   According to a second aspect of the invention, in the joint structure of a pile and a column according to the first aspect, a pile head reinforcing bar provided so as to protrude upward from the head of the pile is embedded in a leg portion of the column.

第2態様の発明では、杭頭補強筋によって、柱に生じる引張力を杭へ伝達することができる。   In the invention of the second aspect, the tensile force generated in the column can be transmitted to the pile by the pile head reinforcing bar.

第3態様の発明は、第1又は第2態様の杭と柱の接合構造において、前記柱の脚部と接合される基礎梁がない。   In the invention of the third aspect, there is no foundation beam to be joined to the leg portion of the column in the pile-column connection structure of the first or second aspect.

第3態様の発明では、柱の脚部と接合される基礎梁がないので、柱の脚部の固定度を小さくすることができる。これにより、杭と柱の接合部に曲げモーメントが生じることをより抑制することができる。   In the invention of the third aspect, since there is no foundation beam joined to the leg portion of the column, the fixing degree of the column leg portion can be reduced. Thereby, it can suppress more that a bending moment arises in the junction part of a pile and a pillar.

本発明は上記構成としたので、杭と柱を接合する接合構造の施工性を向上させることができる。   Since this invention set it as the said structure, the workability of the joining structure which joins a pile and a pillar can be improved.

本発明の実施形態に係る杭と柱の接合構造を示す正面断面図である。It is a front sectional view showing the joining structure of a pile and a pillar concerning an embodiment of the present invention. 図1のA−A断面図である。It is AA sectional drawing of FIG. 本発明の実施形態に係る杭と柱の接合構造のバリエーションを示す正面断面図である。It is front sectional drawing which shows the variation of the joining structure of the pile which concerns on embodiment of this invention, and a column. 図3のB−B断面図である。It is BB sectional drawing of FIG.

図を参照しながら、本発明の実施形態を説明する。まず、本発明の実施形態に係る杭と柱の接合構造について説明する。   Embodiments of the present invention will be described with reference to the drawings. First, the joint structure of a pile and a column according to an embodiment of the present invention will be described.

図1の正面断面図には、本実施形態の杭と柱の接合構造10が示されている。杭と柱の接合構造10は、杭12と柱14を有して構成されている。   In the front cross-sectional view of FIG. 1, a pile-column joining structure 10 of the present embodiment is shown. The pile-column connection structure 10 includes a pile 12 and a column 14.

図1、及び図1のA−A断面図である図2に示すように、杭12は、円筒状の既製プレテンション方式遠心力高強度プレストレストコンクリート杭(所謂、既製PHC杭)であり、地盤16中に埋設されている。   As shown in FIG. 1 and FIG. 2, which is a cross-sectional view taken along line AA in FIG. 1, the pile 12 is a cylindrical pre-tensioned centrifugal high-strength prestressed concrete pile (so-called pre-made PHC pile). 16 is embedded.

柱14は、角柱状の鉄骨鉄筋コンクリート製の部材であり、コンクリートによって形成された柱本体18中に角形鋼管20、柱主筋22、及びせん断補強筋24が埋設されている。角形鋼管20は、柱本体18の略中央部に配置され、柱主筋22は、角形鋼管20を取り囲むように複数配置されている。また、せん断補強筋24は、複数の柱主筋22を取り囲むようにして上下方向へ複数配置されている。   The column 14 is a member made of prismatic steel reinforced concrete, and a square steel pipe 20, a column main bar 22, and a shear reinforcement bar 24 are embedded in a column main body 18 formed of concrete. The square steel pipe 20 is arranged at a substantially central portion of the column main body 18, and a plurality of column main bars 22 are arranged so as to surround the square steel pipe 20. A plurality of shear reinforcement bars 24 are arranged in the vertical direction so as to surround the plurality of column main bars 22.

柱14は、杭12の頭部としての杭頭部26を取り囲むように柱主筋22が配置されるようにして、柱14の脚部としての柱脚部28の略中心部に杭頭部26を埋設することにより、杭12と接合されている。以下、地盤16に埋設されている柱脚部28の部分を支圧部30とする。   The pillar 14 is arranged so that the column main reinforcement 22 is disposed so as to surround the pile head 26 as the head of the pile 12, and the pile head 26 is provided at a substantially central portion of the column base part 28 as the leg part of the column 14. Is buried with the pile 12. Hereinafter, the portion of the column base portion 28 embedded in the ground 16 is referred to as a bearing portion 30.

支圧部30の平断面は、支圧部30以外の柱14の部位の平断面よりも大きくなっている。支圧部30の平断面の大きさ、杭頭部26の外周面から支圧部30の外周面までの距離R、支圧部30の高さH、柱脚部28に対する杭頭部26の埋設長S、及び杭頭部26に対する柱主筋22の下端部のラップ長Lは、柱14に生じるせん断力を杭12へ伝達できる値になっている。   The plane cross section of the bearing section 30 is larger than the plane section of the column 14 other than the bearing section 30. The size of the flat section of the bearing section 30, the distance R from the outer circumferential surface of the pile head 26 to the outer circumferential surface of the bearing section 30, the height H of the bearing section 30, and the pile head 26 relative to the column base 28. The wrap length L and the wrap length L of the lower end portion of the column main reinforcement 22 with respect to the pile head 26 are values that can transmit the shearing force generated in the column 14 to the pile 12.

柱脚部28には、一般的なフーチングとは異なり、基礎梁が接合されていない。すなわち、杭と柱の接合構造10には、柱脚部28と接合される基礎梁がない。また、杭12には、杭頭部26から上方へ突出する杭頭筋は設けられていない。   Unlike the general footing, the foundation beam is not joined to the column base part 28. That is, the pile-column joint structure 10 does not have a foundation beam joined to the column base 28. Further, the pile 12 is not provided with a pile head muscle protruding upward from the pile head 26.

次に、本発明の実施形態に係る杭と柱の接合構造の作用と効果について説明する。   Next, the action and effect of the joint structure between the pile and the column according to the embodiment of the present invention will be described.

本実施形態の杭と柱の接合構造10では、図1及び図2に示すように、柱14の支圧部30と、杭頭部26を取り囲むように配置された柱主筋22とによって、柱14に生じるせん断力を杭12へ伝達し、杭12と柱14を接合することができる。   In the pile-column joint structure 10 of this embodiment, as shown in FIGS. 1 and 2, the column 14 includes a column supporting portion 30 and a column main reinforcement 22 arranged so as to surround the pile head 26. The shear force generated in 14 can be transmitted to the pile 12, and the pile 12 and the column 14 can be joined.

また、本実施形態の杭と柱の接合構造10では、杭頭部26を柱脚部28に埋設した接合構造により、柱脚部28をピン接合として建物の上部構造を設計し、杭頭部26をピン接合として杭12の設計を行うことができる。これにより、杭12と柱14の接合部に曲げモーメントが生じることを抑制でき、杭12と柱14の接合部はせん断力の伝達を主に担えばよくなる。よって、杭12と柱14の接合部に、柱14の柱主筋及びせん断補強筋以外の鉄筋を配置する必要がなくなり、簡単な接合構造によって杭12と柱14を接合することができるので、杭12と柱14を接合する接合構造の施工性を向上させることができる。   Moreover, in the pile-column joint structure 10 of the present embodiment, the upper structure of the building is designed with the column base portion 28 as a pin joint by the joint structure in which the pile head portion 26 is embedded in the column base portion 28, and the pile head portion The pile 12 can be designed with 26 as a pin joint. Thereby, it can suppress that a bending moment arises in the junction part of the pile 12 and the pillar 14, and the junction part of the pile 12 and the pillar 14 should just bear transmission of a shearing force mainly. Therefore, it is not necessary to arrange reinforcing bars other than the column main reinforcement and shear reinforcement of the column 14 at the joint between the pile 12 and the column 14, and the pile 12 and the column 14 can be joined with a simple joining structure. The workability of the joining structure for joining 12 and the column 14 can be improved.

さらに、本実施形態の杭と柱の接合構造10では、柱脚部28と接合される基礎梁がないので、柱脚部28の固定度を小さくすることができる。これにより、杭12と柱14の接合部に曲げモーメントが生じることをより抑制することができる。   Furthermore, in the pile-column joint structure 10 of the present embodiment, since there is no foundation beam to be joined to the column base 28, the fixing degree of the column base 28 can be reduced. Thereby, it can suppress more that a bending moment arises in the junction part of the pile 12 and the pillar 14. FIG.

また、本実施形態の杭と柱の接合構造10では、フーチングを介して杭と柱を接合する従来の接合構造に比べて、杭12の天端レベルを上げることができる。これにより、掘削土量を削減することができる。   Moreover, in the joint structure 10 of a pile and a column of this embodiment, the top end level of the pile 12 can be raised compared with the conventional joint structure which joins a pile and a column via footing. Thereby, the amount of excavated soil can be reduced.

さらに、本実施形態の杭と柱の接合構造10では、杭12の施工誤差(平面配置の誤差)に対しては、柱主筋22に追加補強筋を配筋することで施工誤差による偏心曲げを処理することができる。   Furthermore, in the pile-column joint structure 10 of the present embodiment, for the construction error (planar layout error) of the pile 12, eccentric bending due to the construction error is performed by arranging additional reinforcing bars on the column main bars 22. Can be processed.

以上、本発明の実施形態について説明した。   The embodiment of the present invention has been described above.

なお、本実施形態では、柱14を鉄骨鉄筋コンクリート製の部材とした例を示したが、柱14は、柱主筋を有する柱であればよく、例えば、鉄筋コンクリート製の部材であってもよい。   In this embodiment, an example in which the column 14 is a member made of steel reinforced concrete has been shown. However, the column 14 may be a column having a column main reinforcement, and may be a member made of reinforced concrete, for example.

また、本実施形態では、杭12を既製プレテンション方式遠心力高強度プレストレストコンクリート杭とした例を示したが、杭12は、鋼製杭、鉄筋コンクリート杭、プレストレストコンクリート杭、高強度コンクリート杭等のさまざまな構造の既製杭や場所打ち杭を用いることができる。例えば、杭12を、鋼管杭、H形鋼杭、外殻鋼管付きコンクリート杭(所謂、SC杭)、遠心力プレストレスト鉄筋コンクリート杭(所謂、PRC杭)としてもよい。杭12としては、高い支持力を有する細径の既製杭が好ましい。   Moreover, in this embodiment, although the pile 12 was shown as the ready-made pre-tension type centrifugal force high-strength prestressed concrete pile, the pile 12 was made of steel pile, reinforced concrete pile, prestressed concrete pile, high-strength concrete pile, etc. Various types of ready-made piles and cast-in-place piles can be used. For example, the pile 12 may be a steel pipe pile, an H-shaped steel pile, a concrete pile with a shell steel pipe (so-called SC pile), or a centrifugal prestressed reinforced concrete pile (so-called PRC pile). The pile 12 is preferably a small-diameter ready-made pile having a high supporting force.

さらに、本実施形態では、杭12に、杭頭部26から上方へ突出する杭頭筋が設けられていない例を示したが、図3の正面断面図、及び図3のB−B断面図である図4に示す、杭と柱の接合構造32のように、杭頭部26から上方へ突出して設けられた杭頭補強筋34を柱脚部28に埋設するようにしてもよい。   Furthermore, in this embodiment, although the example in which the pile head muscle which protrudes upwards from the pile head 26 was shown in the pile 12 was shown, front sectional drawing of FIG. 3, and BB sectional drawing of FIG. A pile head reinforcing bar 34 protruding upward from the pile head 26 may be embedded in the column base 28 as shown in FIG.

杭頭補強筋34は、上端部が外側へ広がるように根元部分で曲げられており、角形鋼管20を取り囲むように配置されている。また、杭頭補強筋34は、柱主筋22によって取り囲まれている。すなわち、杭頭補強筋34は、角形鋼管20と柱主筋22の間に配置されている。   The pile head reinforcing bar 34 is bent at the base portion so that the upper end portion spreads outward, and is disposed so as to surround the square steel pipe 20. In addition, the pile head reinforcement 34 is surrounded by the column main reinforcement 22. That is, the pile head reinforcing bars 34 are disposed between the square steel pipe 20 and the column main bars 22.

このようにすれば、杭頭補強筋34によって、柱14に生じる引張力を杭12へ伝達することができる。   In this way, the tensile force generated in the column 14 can be transmitted to the pile 12 by the pile head reinforcing bar 34.

以上、本発明の実施形態について説明したが、本発明はこうした実施形態に何等限定されるものでなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。   As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10、32 杭と柱の接合構造
12 杭
14 柱
16 地盤
22 柱主筋
26 杭頭部(杭の頭部)
28 柱脚部(柱の脚部)
34 杭頭補強筋
10, 32 Joint structure of pile and column 12 Pile 14 Column 16 Ground 22 Column main reinforcement 26 Pile head (head of pile)
28 Column base (column leg)
34 Pile head reinforcement

Claims (3)

地盤に埋設された杭と、
前記杭の頭部を取り囲むように柱主筋が配置され、前記杭の頭部が脚部に埋設されて前記杭と接合されたコンクリート製の柱と、
を有する杭と柱の接合構造。
A pile buried in the ground,
Column main bars are arranged so as to surround the head of the pile, and a concrete column in which the head of the pile is embedded in a leg and joined to the pile,
Pile-column connection structure with
前記杭の頭部から上方へ突出して設けられた杭頭補強筋が前記柱の脚部に埋設されている請求項1に記載の杭と柱の接合構造。   The pile-column joining structure according to claim 1, wherein a pile head reinforcing bar provided so as to protrude upward from the head of the pile is embedded in a leg portion of the column. 前記柱の脚部と接合される基礎梁がない請求項1又は2に記載の杭と柱の接合構造。   The pile-column connection structure according to claim 1 or 2, wherein there is no foundation beam to be bonded to the leg portion of the column.
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