JP6253916B2 - Pile head joint structure - Google Patents

Pile head joint structure Download PDF

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JP6253916B2
JP6253916B2 JP2013161218A JP2013161218A JP6253916B2 JP 6253916 B2 JP6253916 B2 JP 6253916B2 JP 2013161218 A JP2013161218 A JP 2013161218A JP 2013161218 A JP2013161218 A JP 2013161218A JP 6253916 B2 JP6253916 B2 JP 6253916B2
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pile head
pile
plate
foundation
joint structure
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JP2015031052A (en
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理揮 中原
理揮 中原
濱田　聡
聡 濱田
剛 東口
剛 東口
森　武史
武史 森
行孝 太田
行孝 太田
遼 白井
遼 白井
仁 本多
仁 本多
宏幸 平井
宏幸 平井
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Toda Corp
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本発明は、例えば、ＳＣ杭（外殻鋼管付き遠心力コンクリート杭：鋼管で被覆した既成コンクリート杭、以下単に鋼管コンクリート杭と称することもある）、鋼管杭、場所打ち鋼管巻杭等における、基礎部に対する杭頭部の接合構造に関するものである。   The present invention includes, for example, foundations in SC piles (centrifugal concrete piles with shell steel pipes: precast concrete piles covered with steel pipes, hereinafter sometimes simply referred to as steel pipe concrete piles), steel pipe piles, cast-in-place steel pipe wound piles, etc. It is related with the joint structure of the pile head with respect to a part.

従来、ＳＣ杭などの高強度杭においては、技術開発に伴い次第に径の縮小化が進行している。その結果、図７に示すように、ＳＣ杭５の杭頭部５ａに溶接手段で固着される杭頭補強筋２が、周方向に密に配筋される。それにより、図８（Ａ）に示すように、基礎梁主筋３の縦・横に配筋される位置と、前記杭頭補強筋２の周方向の配筋位置とが干渉してしまうおそれがある。このように、杭径の縮小化により杭頭補強筋と基礎梁主筋との交差部の収まりが非常に困難となる。   Conventionally, in high-strength piles such as SC piles, the diameter is gradually reduced along with technological development. As a result, as shown in FIG. 7, the pile head reinforcing bars 2 fixed to the pile head 5a of the SC pile 5 by welding means are densely arranged in the circumferential direction. Thereby, as shown to FIG. 8 (A), there exists a possibility that the position arrange | positioned vertically and horizontally of the foundation beam main reinforcement 3 and the reinforcement arrangement position of the circumferential direction of the said pile head reinforcement 2 may interfere. is there. Thus, the reduction of the pile diameter makes it very difficult to fit the intersection between the pile head reinforcement and the foundation beam main reinforcement.

前記杭頭補強筋の干渉を避けるために必要数の補強筋が確保されないと、杭頭固定時に生じる曲げモーメントを杭頭補強筋だけで処理できなくなり、図８（Ｂ）に示すように、基礎部１２への杭の飲み込み長さを深くして、基礎梁への応力伝達を図る必要がある。その結果、根切り底が下がるので、山留め壁などの設置、基礎フーチングの平面寸法の拡大となり、更に工事コストが嵩むことになる。   If the necessary number of reinforcing bars is not secured to avoid interference with the pile head reinforcing bars, the bending moment generated at the time of fixing the pile head cannot be processed by the pile head reinforcing bars alone, as shown in FIG. It is necessary to deepen the swallowing length of the pile into the portion 12 and to transmit the stress to the foundation beam. As a result, the root cutting bottom is lowered, and installation of mountain retaining walls and the like, expansion of the plane dimensions of the foundation footing, and the construction cost increase.

そこで、特許文献１に記載されているような、杭頭部の接合構造が提案されている。これは、杭の中心から放射状に複数の鉛直リブを杭頭部の外周面に溶接し、隣接する鉛直リブの先端部同士に鋼板を溶接し、平面視で八角形状の外鋼管を形成してその外周面に複数のアンカー筋が溶接されている。そして、前記外鋼管と杭頭部との間にコンクリートなどの充填材が充填されてなるものが知られている。   Therefore, a pile head joint structure as described in Patent Document 1 has been proposed. This consists of welding a plurality of vertical ribs radially from the center of the pile to the outer peripheral surface of the pile head, welding steel plates to the ends of adjacent vertical ribs, and forming an octagonal outer steel pipe in plan view. A plurality of anchor bars are welded to the outer peripheral surface. And what is filled with fillers, such as concrete, between the said outer steel pipe and a pile head is known.

特開２００６−８３６０９号公報JP 2006-83609 A

しかし、従来の杭頭部の接合構造においては、この場合でも、アンカー筋と基礎梁主筋との干渉が問題となり、充填コンクリートによる接合のため、曲げ応力時の圧縮側の応力伝達が不明確であるという課題がある。本発明に係る杭頭部の接合構造は、このような課題を解決するために提案されたものである。   However, in the conventional pile head joint structure, even in this case, the interference between the anchor bar and the main beam of the foundation beam is a problem. There is a problem that there is. The pile head joint structure according to the present invention has been proposed in order to solve such a problem.

本発明に係る杭頭部の接合構造の上記課題を解決して目的を達成するための要旨は、外殻鋼管付き遠心力コンクリート杭を構造物の基礎に接合するための杭頭部の接合構造において、杭頭部の周囲に鉛直方向に配筋される複数の杭頭補強筋は、水平方向で縦横に格子状に配筋される基礎梁主筋に対して互いに干渉しないで配筋され、且つ、前記構造物の基礎の杭を平面視して該杭の周囲に略四角形状にして前記杭頭補強筋が均等に間隔を置いて配置されて、杭頭部における曲げ抵抗に有効な杭頭補強筋を増やすことで基礎部の曲げモーメント負担率が低下するように、前記杭頭部の鋼管外周面に、平板状の鋼製プレートの側端部が固着されるとともに、少なくとも４箇所で前記杭の半径方向に向けて前記鋼製プレートが突出され、且つ、前記1箇所の鋼製プレートの形状が一枚若しくは複数枚の鋼製プレートによって上下方向から側面視して三角形状、半円形状、半楕円形状、Ｌ字型形状のいずれか一つの形状にされてなる補強筋プレートが前記杭頭部に突設され、
前記突設されている補強筋プレートの平坦面に杭頭補強筋の下端部が固着されていること、である。 The gist for solving the above-mentioned problems of the pile head joint structure according to the present invention is to achieve the purpose of the pile head joint structure for joining a centrifugal concrete pile with a shell steel pipe to the foundation of a structure. A plurality of pile head reinforcement bars arranged in the vertical direction around the pile head are arranged without interfering with each other with respect to the main beam main reinforcement bars arranged in a grid pattern in the horizontal and vertical directions , and The pile head effective for bending resistance at the pile head is obtained by making the pile of the foundation of the structure in a plan view in a substantially rectangular shape around the pile and arranging the pile head reinforcing bars at even intervals. The side end of the flat steel plate is fixed to the outer peripheral surface of the steel pipe of the pile head so that the bending moment burden rate of the foundation portion is reduced by increasing the reinforcing bars, and at least at four places The steel plate protrudes in the radial direction of the pile, and the 1 The shape of the steel plate at the location is made into one of a triangular shape, a semicircular shape, a semi-elliptical shape, and an L-shape when viewed from the side in the vertical direction by one or a plurality of steel plates. Reinforcing bar plates project from the pile head,
The lower end portion of the pile head reinforcing bar is fixed to the flat surface of the protruding reinforcing bar plate .

前記補強筋プレートの上下方向における上下端面のそれぞれに直交するようにフランジプレートの平坦面を当接させるとともに前記フランジプレートの基部端面を杭頭部の外周面に当接させて、前記上下のフランジプレートに発生する偶力を前記杭頭部へ確実に伝達するため、前記補強筋プレートと前記フランジプレートとが一体化されて杭頭部に固着されていることを含むものである。 The flat surface of the flange plate is brought into contact with each of the upper and lower end surfaces in the vertical direction of the reinforcing bar plate, and the base end surface of the flange plate is brought into contact with the outer peripheral surface of the pile head, so that the upper and lower flanges In order to reliably transmit the couple generated in the plate to the pile head, the reinforcing bar plate and the flange plate are integrated and fixed to the pile head .

本発明の杭頭部の接合構造によれば、杭頭補強筋を円形状ではなく略四角形状にして均等に間隔を置いて配置することができるようになり、基礎梁主筋との干渉が無くなり、収まりが容易となって施工性が向上する。
また、曲げ抵抗に有効な杭頭補強筋を増やすことができるので、フーチングへの杭の飲み込み長さを短くすることができる。その結果、基礎部のコストダウンを図ることができる。
更に、杭頭の曲げ応力を求める際、前記杭頭補強筋を四角形の輪郭を形成するように配置できるので、ＲＣ柱評価式で代替えでき、簡便な評価手法で外殻鋼管付き遠心力コンクリート杭の杭頭処理ができると言う優れた効果を奏するものである。 According to the pile head joint structure of the present invention, it becomes possible to arrange the pile head reinforcing bars in a substantially rectangular shape instead of a circular shape and arrange them at regular intervals, and there is no interference with the foundation beam main bars. , It is easy to fit and the workability is improved.
Moreover, since the pile head reinforcement which is effective for bending resistance can be increased, the swallowing length of the pile to a footing can be shortened. As a result, the cost of the foundation can be reduced.
Furthermore, when determining the bending stress of the pile head, the pile head reinforcement can be arranged to form a quadrilateral contour, so it can be replaced by the RC column evaluation formula, and a centrifugal force concrete pile with a shell steel tube can be replaced with a simple evaluation method. There is an excellent effect that the pile head can be processed.

本発明に係る杭頭部の接合構造１を示す斜視図である。It is a perspective view which shows the joining structure 1 of the pile head which concerns on this invention. 同本発明の杭頭部の接合構造１の平面図である。It is a top view of the joining structure 1 of the pile head of the same invention. 本発明に係る杭頭部の接合構造１による杭頭補強筋と、基礎梁主筋との配筋による干渉位置関係を示す平面図である。It is a top view which shows the interference positional relationship by the reinforcement arrangement | positioning with the pile head reinforcement and the foundation beam main reinforcement by the pile head joint structure 1 which concerns on this invention. 同本発明の他の実施例に係る杭頭部の接合構造１ａを示す斜視図である。It is a perspective view which shows the pile head joint structure 1a which concerns on the other Example of the same invention. 本発明に係る杭頭部の接合構造１と、従来例に係る杭頭部の接合構造１１とにおける、杭頭補強筋の曲げ抵抗に有効な鉄筋の本数の相違を比較して示す概念図（Ａ），（Ｂ）である。The conceptual diagram which compares and shows the difference of the number of the reinforcing bars effective in the bending resistance of a pile head reinforcement in the pile head joining structure 1 which concerns on this invention, and the pile head joining structure 11 which concerns on a prior art example ( A) and (B). 本発明に係る杭頭部の接合構造１と従来例に係る杭頭部の接合構造１１とにおける、許容曲げモーメントを比較した特性曲線図である。It is the characteristic curve figure which compared the allowable bending moment in the joining structure 1 of the pile head which concerns on this invention, and the joining structure 11 of the pile head which concerns on a prior art example. 従来の杭頭部の接合構造１１を示す平面図である。It is a top view which shows the joining structure 11 of the conventional pile head. 従来の杭頭部の接合構造１１における基礎梁主筋との配筋による干渉位置関係を示す平面図（Ａ）、同ＳＣ杭５による基礎部１２への食い込み長さを示す断面図（Ｂ）である。The top view (A) which shows the interference positional relationship by the reinforcement arrangement | positioning with the foundation beam main reinforcement in the joining structure 11 of the conventional pile head, and sectional drawing (B) which shows the biting length to the foundation part 12 by the SC pile 5 is there.

本発明に係る杭頭部の接合構造１は、図１乃至図３に示すように、杭頭補強筋２の配置が、基礎梁主筋３と干渉しない配置となるようにするため、補強筋プレート４をＳＣ杭５の杭頭部５ａに設けたものである。   As shown in FIGS. 1 to 3, the pile head joint structure 1 according to the present invention has a reinforcing bar plate so that the arrangement of the pile head reinforcing bars 2 does not interfere with the foundation beam main bars 3. 4 is provided on the pile head 5 a of the SC pile 5.

前記杭頭部の接合構造１は、図１乃至図３に示すように、外殻鋼管付き遠心力コンクリート杭（ＳＣ杭等）５を、構造物の基礎部１２（図８（Ｂ）参照）に接合するための杭頭部の接合構造において、杭頭部５ａの周囲に鉛直方向に配筋される複数の杭頭補強筋２が、水平方向で縦横に格子状に配筋される基礎梁主筋３に対して互いに干渉しないで配筋されるように、鋼管の杭頭部５ａにコーナー部用の補強筋プレート４を固着して設けるとともに、前記補強筋プレート４に杭頭補強筋２の下端部２ａを固着して配筋する。   As shown in FIG. 1 to FIG. 3, the pile head joint structure 1 includes a centrifugal concrete pile (SC pile, etc.) 5 with a shell steel pipe, and a foundation 12 of the structure (see FIG. 8B). In the joint structure of the pile heads for joining to each other, a foundation beam in which a plurality of pile head reinforcing bars 2 arranged in the vertical direction around the pile head 5a are arranged in a grid in the vertical and horizontal directions in the horizontal direction The reinforcing bar plate 4 for the corner portion is fixedly provided on the pile head portion 5a of the steel pipe so that the main reinforcing bars 3 are arranged without interfering with each other, and the pile head reinforcing bar 2 is provided on the reinforcing bar plate 4. The lower end 2a is fixed and arranged.

前記補強筋プレート４は、図２に示すように、鋼管コンクリート杭５を平面視して、少なくとも４箇所に前記鋼管コンクリート杭５の半径方向に突出して設けられる。また、この補強筋プレート４は、図２に示す例では、平板で２枚の鋼製プレート４ａ，４ｂの側端部を杭頭部５ａの鋼管に隅肉溶接し、該鋼製プレート４ａ，４ｂの板先端部同士を組み合わせて三角形状にして固着している。 As shown in FIG. 2, the reinforcing bar plate 4 is provided so as to protrude in the radial direction of the steel pipe concrete pile 5 in at least four places in plan view of the steel pipe concrete pile 5. Further, in the example shown in FIG. 2, the reinforcing bar plate 4 is a flat plate, and the side ends of the two steel plates 4a and 4b are fillet welded to the steel pipe of the pile head 5a, and the steel plates 4a, The plate tip portions of 4b are combined and fixed in a triangular shape.

前記補強筋プレート４は、前述のように２枚の平板を組み合わせるだけでなく、例えば、１枚の板を曲げ加工などして、側面視して三角形状、半円形状、半楕円形状、Ｌ字型形状のいずれか一つの形状にして、杭頭部５ａにプレートの両側端部を隅肉溶接して固着することができる。１枚板であれば、板先端部同士の溶接を省略することができるからである。   The reinforcing bar plate 4 not only combines two flat plates as described above, but also has a triangular shape, a semicircular shape, a semi-elliptical shape, L as viewed from the side, for example, by bending one plate. Any one of the letter-shaped shapes can be fixed to the pile head 5a by fillet welding the both side ends of the plate. This is because, if a single plate is used, it is possible to omit welding between the plate tip portions.

他の実施例に係る接合構造１ａは、図４に示すように、補強筋プレート４ａ，４ｂを、当該補強筋プレートの上下方向における上下端面のそれぞれに直交するようにフランジプレートの平坦面を当接させるとともに前記フランジプレートの基部端面を杭頭部５ａの外周面に当接させて、当該フランジプレート６と一体化させ、前記三角形状の補強筋プレート４ａ，４ｂと前記上下のフランジプレート６とを杭頭部５ａの鋼管に固着するものである。接合構造１ａは接合構造１と同様に杭頭補強筋２の下端部２ａを固着して配筋する。接合構造１ａは、補強筋プレート４ａ，４ｂをフランジプレート６と一体化させることで、接合構造と比較して、上下のフランジプレート６に発生する偶力を杭頭部５ａへ確実に伝達することができる。 As shown in FIG. 4, in the joining structure 1a according to another embodiment, the reinforcing plate 4a, 4b is made to contact the flat surface of the flange plate so as to be orthogonal to the upper and lower end surfaces in the vertical direction of the reinforcing plate. The base end face of the flange plate is brought into contact with the outer peripheral surface of the pile head 5a and integrated with the flange plate 6, and the triangular reinforcing bar plates 4a and 4b and the upper and lower flange plates 6 Is fixed to the steel pipe of the pile head 5a. The joint structure 1 a is arranged by fixing the lower end portion 2 a of the pile head reinforcement 2 similarly to the joint structure 1. By joining reinforcing bar plates 4a and 4b with flange plate 6, joint structure 1a can reliably transmit the couple generated in upper and lower flange plates 6 to pile head 5a as compared with the joint structure. Can do.

前記補強筋プレート４は、その縦・横の大きさや板厚の厚さなどに関しては、杭頭部に要求される曲げ抵抗力に対応して、鋼材の許容応力度以下となるように適宜に設計される設計事項である。この補強筋プレート４は、構造物の建築現場のサイト等において、ＳＣ杭５への固着作業が行われて取付けられるものである。   The reinforcing bar plate 4 has a vertical and horizontal size, a thickness of the plate thickness, etc., corresponding to the bending resistance required for the pile head so as to be less than the allowable stress level of the steel material. Design items to be designed. The reinforcing bar plate 4 is attached by performing an adhering operation to the SC pile 5 at a site of a construction site of a structure.

補強筋プレート４は、杭の建込前に固着させることも、また、杭設置後、周辺を掘り出した後、固着させることも可能である。杭建込前に設置する場合には、前記ＳＣ杭５に前記補強筋プレート４が取り付けられた後に、このＳＣ杭５を現場の地盤に、例えば、打込み工法、埋込み工法、圧入工法などのいずれかの適宜な工法にて、貫入させて設置する。   The reinforcing bar plate 4 can be fixed before the pile is built, or can be fixed after excavating the periphery after the pile is installed. When installing before pile erection, after the reinforcing bar plate 4 is attached to the SC pile 5, the SC pile 5 is placed on the ground of the site, for example, any of the driving method, the embedding method, the press-fitting method, etc. Install with the appropriate method.

そして、前記補強筋プレート４が露呈するまで掘削し、図１に示すように、この補強筋プレート４に杭頭補強筋２の下端部２ａを溶接手段で隅肉溶接して固着する。その後、前記ＳＣ杭５の杭頭部５ａ周囲を埋め戻す。その後、図３に示すように、基礎梁主筋３の配筋と基礎梁用型枠の設置を行い、コンクリートを型枠内に打設して基礎部１２を構築するものである。   Then, excavation is performed until the reinforcing bar plate 4 is exposed, and the lower end portion 2a of the pile head reinforcing bar 2 is fixed to the reinforcing bar plate 4 by fillet welding with welding means, as shown in FIG. Thereafter, the periphery of the pile head 5a of the SC pile 5 is backfilled. Thereafter, as shown in FIG. 3, the reinforcement of the foundation beam main reinforcement 3 and the foundation beam formwork are installed, and concrete is placed in the formwork to construct the foundation portion 12.

前記基礎梁主筋３の配筋においては、図３に示すように、前記杭頭補強筋２が、基礎梁主筋３の間を縫うように、全体として平面視で四角形状になるように配筋されたので、干渉が無く配筋作業に支障を来すことが無い。よって、基礎梁主筋３の配筋作業がやりやすくなって作業能率が向上するものである。なお、杭頭補強筋２の配置は、四角形状だけに限るのではなく、要は、格子状に配筋される基礎梁主筋３と干渉しない位置に配筋されれば良いのである。   In the bar arrangement of the foundation beam main bar 3, as shown in FIG. 3, the bar head reinforcement 2 is arranged in a square shape in plan view as a whole so as to sew between the bar beam main bars 3. As a result, there is no interference and there is no hindrance to the bar arrangement work. Therefore, it is easy to perform the bar arrangement work of the foundation beam main reinforcement 3 and the work efficiency is improved. In addition, arrangement | positioning of the pile head reinforcement 2 is not restricted only to square shape, In short, it should just be arranged in the position which does not interfere with the foundation beam main reinforcement 3 arranged by the grid | lattice form.

また、図５（Ａ）に示すように、曲げ応力に対する四角形状配列の杭頭補強筋２の曲げモーメント負担率は大きくなる。例えば一事例として、最も曲げモーメントが大きくなるａ範囲内に、曲げて抵抗に有効な鉄筋（Ｄ３８）の杭頭補強筋２が９本あり、図５（Ｂ）に示すように、従来例の周方向の配筋では、ｂ範囲内で５本である。これにより、曲げモーメント負担率が低下する基礎部１２においては、その負担率低下した分だけ配筋・断面が削減できるものである。   In addition, as shown in FIG. 5A, the bending moment burden rate of the square-shaped pile head reinforcing bars 2 with respect to the bending stress increases. For example, as one example, there are nine pile head reinforcing bars 2 of the reinforcing bars (D38) that are bent and effective in the range a in which the bending moment becomes the largest, as shown in FIG. In the circumferential bar arrangement, the number is 5 within the range b. As a result, in the base portion 12 where the bending moment burden ratio is lowered, the bar arrangement / cross section can be reduced by the amount of the lowered burden ratio.

また、図６に示すように、杭頭接合部の２例の仮想断面（１２００□、１２００φ）全体の許容曲げモーメントを比較すると、１２００□の方が大きいのが判る。こうして、前記杭頭尾補強筋２により、杭頭に発生する曲げモーメント・せん断力が、確実に基礎部１２へ伝達されるものである。 Moreover, as shown in FIG. 6, when the allowable bending moments of the entire virtual section (1200 □, 1200φ) of the two examples of the pile head joint are compared, it can be seen that 1200 □ is larger. In this way, the bending head / shearing force generated in the pile head is reliably transmitted to the foundation portion 12 by the pile head / tail reinforcement 2.

本発明に係る杭頭部の接合構造は、鋼管巻きの既成コンクリート杭に広く適用できるほかに、場所打ち鋼管巻杭にも適用できるものである。   The joint structure of the pile head according to the present invention can be widely applied to a precast concrete pile wound with a steel pipe, and can also be applied to a cast-in-place steel pipe wound pile.

１ 杭頭部の接合構造、 １ａ 杭頭部の接合構造、
２ 杭頭補強筋、 ２ａ 下端部、
３ 基礎梁主筋、
４ 補強筋プレート、
５ 外殻鋼管付き遠心力コンクリート（ＳＣ）杭、
５ａ 杭頭部、
６ フランジプレート、
１１ 従来の杭頭部の接合構造、
１２ 基礎部。 1 Pile head joint structure, 1a Pile head joint structure,
2 pile head reinforcement, 2a lower end,
3 foundation beam main reinforcement,
4 Reinforcing bar plate,
5 Centrifugal concrete (SC) pile with outer shell steel pipe,
5a pile head,
6 Flange plate,
11 Conventional pile head joint structure,
12 Foundation.

Claims (2)

外殻鋼管付き遠心力コンクリート杭を構造物の基礎に接合するための杭頭部の接合構造において、
杭頭部の周囲に鉛直方向に配筋される複数の杭頭補強筋は、
水平方向で縦横に格子状に配筋される基礎梁主筋に対して互いに干渉しないで配筋され、且つ、前記構造物の基礎の杭を平面視して該杭の周囲に略四角形状にして前記杭頭補強筋が均等に間隔を置いて配置されて、杭頭部における曲げ抵抗に有効な杭頭補強筋を増やすことで基礎部の曲げモーメント負担率が低下するように、
前記杭頭部の鋼管外周面に、平板状の鋼製プレートの側端部が固着されるとともに、少なくとも４箇所で前記杭の半径方向に向けて前記鋼製プレートが突出され、且つ、前記1箇所の鋼製プレートの形状が一枚若しくは複数枚の鋼製プレートによって上下方向から側面視して三角形状、半円形状、半楕円形状、Ｌ字型形状のいずれか一つの形状にされてなる補強筋プレートが前記杭頭部に突設され、
前記突設されている補強筋プレートの平坦面に杭頭補強筋の下端部が固着されていること、
を特徴とする杭頭部の接合構造。 In the joint structure of the pile head for joining the centrifugal concrete pile with outer shell steel pipe to the foundation of the structure,
Multiple pile head reinforcements that are arranged vertically around the pile head
It is arranged without interfering with each other with respect to the main beam of the foundation beam that is arranged in a grid in the horizontal and vertical directions , and the pile of the foundation of the structure is made into a substantially square shape around the pile in plan view. The pile head reinforcing bars are evenly spaced, so that the bending moment burden rate of the foundation is reduced by increasing the pile head reinforcing bars effective for bending resistance in the pile head,
A side end portion of a flat steel plate is fixed to the steel pipe outer peripheral surface of the pile head, and the steel plate protrudes in the radial direction of the pile at at least four locations, and the 1 The shape of the steel plate at the location is made into one of a triangular shape, a semicircular shape, a semi-elliptical shape, and an L-shape when viewed from the side in the vertical direction by one or a plurality of steel plates. Reinforcing bar plates project from the pile head,
The lower end of the pile head reinforcement is fixed to the flat surface of the reinforcing reinforcement plate that is projected,
A pile head joint structure characterized by 補強筋プレートの上下方向における上下端面のそれぞれに直交するようにフランジプレートの平坦面を当接させるとともに前記フランジプレートの基部端面を杭頭部の外周面に当接させて、前記上下のフランジプレートに発生する偶力を前記杭頭部へ確実に伝達するため、前記補強筋プレートと前記フランジプレートとが一体化されて杭頭部に固着されていること、
を特徴とする請求項１に記載の杭頭部の接合構造。 The upper and lower flange plates are brought into contact with the flat surface of the flange plate so as to be orthogonal to the upper and lower end surfaces in the vertical direction of the reinforcing bar plate and the base end face of the flange plate is brought into contact with the outer peripheral surface of the pile head. In order to reliably transmit the couple generated in the pile head, the reinforcing bar plate and the flange plate are integrated and fixed to the pile head,
The pile head joint structure according to claim 1.
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