JP2009167602A - Structure of h-shaped steel pile - Google Patents
Structure of h-shaped steel pile Download PDFInfo
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- JP2009167602A JP2009167602A JP2008003925A JP2008003925A JP2009167602A JP 2009167602 A JP2009167602 A JP 2009167602A JP 2008003925 A JP2008003925 A JP 2008003925A JP 2008003925 A JP2008003925 A JP 2008003925A JP 2009167602 A JP2009167602 A JP 2009167602A
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Abstract
Description
本発明は施工性を改善し、先端支持力を大きくしたH型鋼杭の構造に関する。 The present invention relates to the structure of an H-shaped steel pile with improved workability and increased tip support force.
建築構造物や仮設構造物の基礎に使用されているH型鋼杭は、地震などによる水平方向に作用する曲げモーメントに対する杭の耐力が、フランジと平行な軸回りのモーメントに対しては強く、ウエブと平行な軸回りモーメントに対しては弱く、水平荷重作用方向に対する耐力の差が大きい。そこで、H型鋼杭の頭部や先端部の側面フランジ端部間にウエブと平行に補強鋼板を設けることで、水平荷重作用方向に対する耐力の差を少なくし、ソイルセメント工法などで施工した際、補強鋼板とフランジとで杭先端部が閉断面を構成するようにして鉛直支持力を向上させるようにしたものが提案されている(特許文献1)。 The H-shaped steel piles used for the foundations of building structures and temporary structures are strong against bending moments acting in the horizontal direction due to earthquakes, etc., against the moments around the axis parallel to the flange. Is weak against the moment around the axis parallel to the horizontal axis, and the difference in yield strength with respect to the direction of horizontal load action is large. Therefore, by providing a reinforced steel plate in parallel with the web between the head of the H-shaped steel pile and the side flange end of the tip, the difference in the proof stress with respect to the horizontal load acting direction is reduced. There has been proposed a structure in which a vertical support force is improved by a reinforcing steel plate and a flange so that a pile front end portion forms a closed cross section (Patent Document 1).
また、H型鋼杭の先端部にワイヤにより開閉可能な開閉部を有する面積拡大部材を取付け、杭の打設中は開閉部を閉じて貫入抵抗を小さくし、所定深さまで打設したときワイヤを僅かに牽引することで開閉部を開くと、貫入抵抗により開閉部が全開し、面積拡大部材により杭の底面積が拡大して先端支持力を強化するようにしたものも提案されている(特許文献2)。
特許文献1では、H型鋼杭の先端部の側面フランジ端部間にウエブと平行に補強鋼板を設けることで、水平荷重作用方向に対する耐力の差を少なくし、ソイルセメント工法などで施工した際、補強鋼板とフランジとで杭先端部が閉断面を構成するようにして鉛直支持力(引き抜き力に対する反力)を向上させているが、H型鋼杭の先端支持力(荷重に対する反力)は、その鋼板の面積でしか評価されないため、補強鋼板の厚み分だけしか増加しない。 In Patent Document 1, by providing a reinforced steel plate in parallel with the web between the side flange end portions of the tip of the H-shaped steel pile, the difference in the proof stress with respect to the horizontal load acting direction is reduced. The vertical support force (reaction force against pull-out force) is improved so that the pile tip portion forms a closed section with the reinforcing steel plate and flange, but the tip support force (reaction force against load) of the H-shaped steel pile is Since only the area of the steel plate is evaluated, it is increased only by the thickness of the reinforcing steel plate.
特許文献2では、H型鋼杭の先端部に開閉可能な面積拡大部材を取り付け、杭を設置したとき杭先端部の面積を拡大させて先端支持力を強化させているが、H型鋼杭先端に開閉可能な面積拡大部材を取り付けて貫入抵抗により全開させるという複雑な構成であるため、コストアップになるとともに、面積拡大部材の開閉部材がうまく開かない場合も起こり得る可能性もあり、その場合は先端支持力の向上を図ることができない。 In patent document 2, the area expansion member which can be opened and closed is attached to the front-end | tip part of an H-shaped steel pile, and when a pile is installed, the area of a pile front-end | tip part is expanded and the tip support force is strengthened. Since it is a complicated configuration that attaches an openable and closable area expansion member and fully opens it by penetration resistance, it increases costs, and there is a possibility that the opening and closing member of the area expansion member may not open well, in which case The tip support force cannot be improved.
本発明は上記課題を解決しようとするものであり、簡単な構成で、施工性に優れるとともに、先端支持力を向上させて本設構造物の基礎杭等にも使用可能なH型鋼杭の構造を提供することを目的とする。
本発明は、H型鋼杭の先端中央部に開口を設けてフランジ間にプレートを取付けたことを特徴とする。
また、本発明は、H型鋼杭の各フランジの先端角部から内側へ所定高さまで斜めに切断し、各斜め切断面の間のフランジとウエブとを切断除去し、フランジの各斜め切断面間にプレートを取り付けたことを特徴とする。
また、本発明は、H型鋼杭の各フランジの先端中央部を残して先端角部を斜めに切断除去し、各切断面間にプレートを取り付けたことを特徴とする。
The present invention is intended to solve the above-mentioned problems, and has a simple structure, excellent workability, and a structure of an H-shaped steel pile that can be used for a foundation pile or the like of a main structure by improving the tip support force. The purpose is to provide.
The present invention is characterized in that an opening is provided at the center of the tip of the H-shaped steel pile and a plate is attached between the flanges.
Moreover, this invention cuts diagonally from the front-end | tip corner | angular part of each flange of a H-shaped steel pile to inner side to predetermined height, cuts and removes the flange and web between each diagonal cut surface, and between each diagonal cut surface of a flange It is characterized by attaching a plate to.
In addition, the present invention is characterized in that the corner of the tip is cut and removed obliquely while leaving the center of the tip of each flange of the H-shaped steel pile, and a plate is attached between the cut surfaces.
本発明は、H型鋼杭の先端部に開口を設けてプレートを取り付けるようにしたので、杭先端部の面積を拡大して先端支持力の強化を図ることができ、簡単な構造で経済性に優れ、開口により建込み時の抵抗を小さくして施工性を向上させることができる。 In the present invention, since the plate is attached by providing an opening at the tip of the H-shaped steel pile, the area of the tip of the pile can be enlarged to enhance the tip support force, and a simple structure is economical. It is excellent, and the opening can reduce the resistance at the time of building and improve the workability.
以下、本発明の実施の形態について説明する。
H型鋼杭の建て込みには、オーガーにより削孔してセメントミルク等を充填した後にH型鋼杭を建込むプレボーリング工法が使用されているが、H型鋼杭が開断面のため施工精度が十分ではないため先端の品質を所定のとおり確保しにくい。また、ソイルセメントで先端強度は確保されるものの先端支持力は十分ではないので仮設構造物用の杭としてしか使用されていない。そこで、本発明はH型鋼杭の先端中央部に開口を設けてフランジ間にプレートを取付ける構造とすることで先端閉断面形状として施工精度を改善し、H型鋼の辺×辺の面積で先端支持力を発揮できる構成を採用する。
Embodiments of the present invention will be described below.
The pre-boring method in which the H-shaped steel pile is built after drilling with an auger and filling with cement milk, etc. is used for the construction of the H-shaped steel pile. Therefore, it is difficult to ensure the tip quality as prescribed. Moreover, although the tip strength is ensured with soil cement, the tip supporting force is not sufficient, so it is used only as a pile for temporary structures. Therefore, the present invention has a structure in which an opening is provided in the center of the tip of the H-shaped steel pile and a plate is attached between the flanges, thereby improving the construction accuracy as a closed cross-sectional shape of the tip, and supporting the tip with the area of the side of the H-shaped steel. Adopt a configuration that can demonstrate its power.
図1はH型鋼杭の一実施例を説明する図であり、図1(a)はフランジ面に垂直な側断面図、図1(b)は杭先端の平面図である。
H型鋼杭10は、ウエブ11の両側部にフランジ12,13を有しており、その先端部には中央部に開口を設けて2枚のプレート20,21を取り付けた構造を有している。すなわち、フランジ12の先端角部12a,12b、フランジ13の先端角部13a,13bから内側へ所定高さまで斜めにフランジを切り込み、さらにフランジ12、13の各斜め切断面の間のフランジ部とウエブとを切断除去し、フランジ12,13の各斜め切断面間に鋼製のプレート20,21を取り付けた構造で、プレート20,21の間の中央部は開口している。
FIG. 1 is a view for explaining one embodiment of an H-shaped steel pile, FIG. 1 (a) is a side sectional view perpendicular to the flange surface, and FIG. 1 (b) is a plan view of the tip of the pile.
The H-
この杭先端構造によれば、オーガーにより削孔してセメントミルク等を充填した後、H型鋼杭を建込む際に、プレート20、21の先端が外側に向かって斜めに食い込み、セメントミルク等の充填物が中央部の開口を通して逃げるため施工性に優れ、プレート20、21があるため先端閉断面形状が形成されて施工精度が改善する。さらに、杭建込み後、ソイルセメントが固化した状態では中央部に開口があるとは言え、フランジの幅をS、ウエブ幅をLとしたとき、杭先端底面積がS×Lに拡大して先端支持力を強化することができ、本設構造物の基礎杭として使用可能となる。なお、フランジの先端角部から内側へ所定高さまで斜めに切り込む角度は、例えば、30°、45°、60°等任意であり、状況に応じて選択すればよい。
According to this pile tip structure, when the H-shaped steel pile is built after drilling with an auger and filling with cement milk or the like, the tips of the
図2はH型鋼杭の他の実施例を説明する図であり、図2(a)はフランジ面に垂直な側断面図、図2(b)は杭先端の平面図である。
この例においても、H型鋼杭10の先端中央部に開口を設けて2枚のプレート30,31を取り付けた構造を有している。すなわち、フランジ12の先端角部12a,12b、フランジ13の先端角部13a,13bの部分を、フランジの先端中央部を残してその外側を斜めに切断除去し、各プレートの切断面間に鋼製のプレート30,31を取り付けた構造で、プレート30,31の間の中央部は開口している。
FIG. 2 is a view for explaining another embodiment of the H-shaped steel pile, FIG. 2 (a) is a sectional side view perpendicular to the flange surface, and FIG. 2 (b) is a plan view of the tip of the pile.
In this example as well, an opening is provided in the center of the tip of the H-
この杭先端構造によれば、オーガーにより削孔してセメントミルク等を充填した後、H型鋼杭を建込む際に、プレート30、31の先端が中央部に向かって斜めのため、プレートの外面でセメントミルク等の充填物を外側に排除しながら、中央部の開口を通して充填物が逃げるため施工性に優れ、プレート30、31があるため先端閉断面形状が形成されて施工精度が改善する。さらに、杭建込み後、ソイルセメントが固化した状態では中央部に開口があるとは言え、フランジの幅をS、ウエブ幅をLとしたとき、杭先端底面積がS×Lに拡大して先端支持力を発揮することができ、本設構造物の基礎杭として使用可能となる。フランジの先端角部を切断する角度は、例えば、30°、45°、60°等任意であり、状況に応じて選択すればよい。
According to this pile tip structure, when the H-shaped steel pile is built after drilling with an auger and filling with cement milk or the like, the tips of the
なお、上記の例においては、施工性を考慮してH型鋼杭先端部のフランジやウエブの一部を切断してプレートを取り付けるようにしたが、状況に応じて杭先端部の一部を特に切断せず、杭先端部に2枚のプレートを中央部に開口を設けるようにしてフランジ間に取り付けるようにしてもよい。 In the above example, considering the workability, the flange and the web at the tip of the H-shaped steel pile were partly cut and the plate was attached. You may make it attach between flanges so that it may provide an opening in the center part with two plates in a pile tip part, without cutting.
10…H型鋼杭、11…ウエブ、12,13…フランジ、20,21,30,31…プレート。 10 ... H-shaped steel pile, 11 ... Web, 12, 13 ... Flange, 20, 21, 30, 31 ... Plate.
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Cited By (1)
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JP5300163B1 (en) * | 2012-12-03 | 2013-09-25 | 株式会社オーク | Steel pile rooting method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6286225A (en) * | 1985-10-14 | 1987-04-20 | Eijiro Kurahashi | Pile |
JPH05321253A (en) * | 1992-05-22 | 1993-12-07 | Hitachi Constr Mach Co Ltd | Boring device |
JP2007085043A (en) * | 2005-09-21 | 2007-04-05 | Tekken Constr Co Ltd | Pile driven in ground |
JP2007239369A (en) * | 2006-03-10 | 2007-09-20 | Marubeni Construction Material Lease Co Ltd | Pile driving construction method |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6286225A (en) * | 1985-10-14 | 1987-04-20 | Eijiro Kurahashi | Pile |
JPH05321253A (en) * | 1992-05-22 | 1993-12-07 | Hitachi Constr Mach Co Ltd | Boring device |
JP2007085043A (en) * | 2005-09-21 | 2007-04-05 | Tekken Constr Co Ltd | Pile driven in ground |
JP2007239369A (en) * | 2006-03-10 | 2007-09-20 | Marubeni Construction Material Lease Co Ltd | Pile driving construction method |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5300163B1 (en) * | 2012-12-03 | 2013-09-25 | 株式会社オーク | Steel pile rooting method |
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