JP5608311B2 - Pile head joint structure of winged steel pipe pile and its construction method - Google Patents
Pile head joint structure of winged steel pipe pile and its construction method Download PDFInfo
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- JP5608311B2 JP5608311B2 JP2012113880A JP2012113880A JP5608311B2 JP 5608311 B2 JP5608311 B2 JP 5608311B2 JP 2012113880 A JP2012113880 A JP 2012113880A JP 2012113880 A JP2012113880 A JP 2012113880A JP 5608311 B2 JP5608311 B2 JP 5608311B2
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Description
本発明は、鋼管杭の先端に翼(羽根)を取付けた翼付鋼管杭の杭頭接合構造とその構築方法に関する。 The present invention relates to a pile head joint structure of a winged steel pipe pile in which a wing (blade) is attached to the tip of the steel pipe pile, and a construction method thereof.
従来鋼管杭の杭頭接合構造において、上部構造物からフーチングに伝達される引抜荷重及び押込荷重に対して杭頭の引抜方向支持力及び押込方向支持力を高くするため、杭頭の外周にリング状のフランジを取付けてフーチング内に埋設する構造のものが提案されている（特許文献１参照）。
図４により従来の鋼管杭の杭頭接合構造について説明する。
図４（ａ）は、杭頭接合構造の側面図（地盤、フーチングは断面図）、図４（ｂ）は、図４（ａ）のＡ１−Ａ１部分の矢印方向の断面図、図４（ｃ）は、図４（ａ）のフランジの平面図である。
鋼管杭１１は、地盤２２に埋設され、その杭頭は、フーチング２１に埋設されている。鋼管杭１１の杭頭には、リング状（ドーナツ状）のフランジ１２を取付けてある。フランジ１２は、開口部１２１を鋼管杭１１に嵌め込み、開口部１２１の内周に沿って鋼管杭１１に溶接してある。１３は、溶接により形成された溶接部である。
フランジ１２の開口部１２１の口径は、鋼管杭１１の外径よりも大きく形成しなければならないが、あまり大きくすると鋼管杭１１とフランジ１２の溶接が困難になり、小さいと鋼管杭１１に嵌め込む作業が難しくなる。
In the conventional pile head joint structure of steel pipe piles, a ring is attached to the outer periphery of the pile head in order to increase the pulling direction supporting force and the pushing direction supporting force of the pile head against the pulling load and pushing load transmitted from the superstructure to the footing. There has been proposed a structure in which a flange is attached and embedded in a footing (see Patent Document 1).
A conventional pile head joint structure for steel pipe piles will be described with reference to FIG.
4A is a side view of the pile head joint structure (the ground and the footing are cross-sectional views), and FIG. 4B is a cross-sectional view of the A1-A1 portion of FIG. c) is a plan view of the flange of FIG.
The steel pipe pile 11 is embedded in the ground 22, and the pile head is embedded in the footing 21. A ring-shaped (doughnut-shaped) flange 12 is attached to the pile head of the steel pipe pile 11. The flange 12 has the opening 121 fitted into the steel pipe pile 11 and is welded to the steel pipe pile 11 along the inner periphery of the opening 121. Reference numeral 13 denotes a welded portion formed by welding.
The diameter of the opening 121 of the flange 12 must be formed larger than the outer diameter of the steel pipe pile 11, but if it is too large, welding of the steel pipe pile 11 and the flange 12 becomes difficult, and if it is small, it fits into the steel pipe pile 11. Work becomes difficult.
またフーチング２１を構築するとき、鋼管杭１１の杭頭にフランジ１２を取付けてコンクリートを打設するから、フランジ１２の下面に空気が滞留して空気滞留部２１１が生成する。空気滞留部２１１の空気は、抜く（放出する）ことが困難であるためフーチング２１内に空洞が生成してフーチング２１の強度が低下する。空気滞留部２１１は、フランジ１２の面積（鋼管杭の杭軸（長手方向）に直交する面の面積）が大きいほど大きくなるが、杭先端に翼を取付けた鋼管杭（翼付鋼管杭）の杭頭接合構造にフランジ１２を用いると、フランジ１２の面積が大きくなり、空気滞留部２１１も大きくなる。即ち翼付鋼管杭は、杭先端の翼により杭に引抜方向支持力及び押込方向支持力が付加されるから、上部構造物の引抜荷重及び押込荷重によりフーチング２１が破壊する、或いは杭頭から抜けるのを防止するためには、フランジ１２の面積をその付加された引抜方向支持力及び押込方向支持力に対応する引抜方向支持力及び押込方向支持力を奏することができる大きさにしなければならないから、空気滞留部２１１も大きくなる。 Further, when the footing 21 is constructed, since the flange 12 is attached to the pile head of the steel pipe pile 11 and the concrete is placed, the air stays on the lower surface of the flange 12 and the air retaining portion 211 is generated. Since it is difficult to remove (release) the air in the air retention part 211, a cavity is generated in the footing 21 and the strength of the footing 21 is reduced. The air retention part 211 becomes larger as the area of the flange 12 (area of the surface orthogonal to the pile axis (longitudinal direction) of the steel pipe pile) is larger, but the steel pipe pile (winged steel pipe pile) with a blade attached to the tip of the pile is larger. When the flange 12 is used for the pile head joint structure, the area of the flange 12 is increased, and the air retention part 211 is also increased. That is, in the steel pipe pile with wings, the pulling direction supporting force and the pushing direction supporting force are added to the pile by the blade at the tip of the pile, so that the footing 21 is broken or pulled out from the pile head by the pulling load and pushing load of the upper structure. In order to prevent this, the area of the flange 12 must be sized so as to exhibit the pulling direction supporting force and the pushing direction supporting force corresponding to the added drawing direction supporting force and the pushing direction supporting force. Moreover, the air retention part 211 also becomes large.
本発明は、翼付鋼管杭の杭頭接合構造にフランジを用いた場合の上記問題点に鑑み、製造、加工、杭への取付けが容易で、杭先端の翼により付加された引抜方向支持力及び押込方向支持力に対応する引抜方向支持力及び押込方向支持力を奏することができる大きさの杭頭支圧金具を用いて、フーチングのコンクリート打設時に杭頭支圧金具の下面に空気滞留部が生成しない構造の翼付鋼管杭の杭頭接合構造とその杭頭接合構造の構築方法を提供することを目的とする。 In view of the above problems when a flange is used for a pile head joint structure of a winged steel pipe pile, the present invention is easy to manufacture, process and attach to the pile, and the drawing direction supporting force added by the wing at the tip of the pile Using a pile head support fitting with a size capable of exhibiting a drawing direction support force and an indentation direction support force corresponding to the pushing direction support force, air stays on the bottom surface of the pile head support fitting when placing the footing in concrete. It aims at providing the construction method of the pile head joint structure of the winged steel pipe pile of the structure which a part does not produce, and the pile head joint structure.
本発明は、その目的を達成するため、請求項１に記載の翼付鋼管杭の杭頭接合構造は、翼付鋼管杭の杭頭の外周に、２個以上の弧状の鋼板からなる杭頭支圧金具を各杭頭支圧金具と隣接する杭頭支圧金具の間に隙間を設けてリング状に配置し杭軸と直交する方向へ鍔状に突出するように取付け、杭頭をコンクリートに埋設してある翼付鋼管杭の杭頭接合構造であって、前記杭頭支圧金具は、鋼板を型抜きして製造したものであり、前記杭頭支圧金具の有効面積（Ｍ２）は、少なくとも、翼の有効面積（Ｍ１）の「地盤の支圧の強さ（Ｑ１）／フーチングの支圧の強さ（Ｑ２）」倍であることを特徴とする。
請求項２に記載の翼付鋼管杭の杭頭接合構造の構築方法は、翼付鋼管杭の杭頭の外周に、２個以上の弧状の鋼板からなる杭頭支圧金具を各杭頭支圧金具と隣接する杭頭支圧金具の間に隙間を設けてリング状に配置し杭軸と直交する方向へ鍔状に突出するように取付け、杭頭をコンクリートに埋設する翼付鋼管杭の杭頭接合構造の構築方法であって、前記杭頭支圧金具は、鋼板を型抜きして製造したものであり、杭頭支圧金具の有効面積（Ｍ２）は、少なくとも、翼の有効面積（Ｍ１）の「地盤の支圧の強さ（Ｑ１）／フーチングの支圧の強さ（Ｑ２）」倍であることを特徴とする。
In order to achieve the object of the present invention, the pile head joint structure of a winged steel pipe pile according to claim 1 is a pile head composed of two or more arc-shaped steel plates on the outer periphery of the pile head of the winged steel pipe pile. The bearing head is attached in a ring shape with a gap between each pile head bearing bracket and the adjacent pile head bearing bracket so that it protrudes like a hook in the direction perpendicular to the pile axis. A pile head joint structure of a winged steel pipe pile embedded in the pile head supporting metal fitting is manufactured by punching a steel plate, and the effective area (M2) of the pile head supporting metal fitting Is at least times the effective area of the wing (M1) times the strength of the ground bearing pressure (Q1) / the strength of the footing bearing pressure (Q2) .
The method for constructing a pile head joint structure of a winged steel pipe pile according to claim 2 is characterized in that a pile head support fitting made of two or more arc-shaped steel plates is attached to each pile head support on the outer periphery of the pile head of the winged steel pipe pile. A winged steel pipe pile with a gap between the pressure fitting and the adjacent pile head support fitting, which is arranged in a ring shape and mounted so as to protrude like a hook in the direction perpendicular to the pile axis, and the pile head is buried in concrete . A method for constructing a pile head joint structure, wherein the pile head support fitting is manufactured by punching a steel plate, and an effective area (M2) of the pile head support fitting is at least an effective area of a blade. (M1) times “the strength of the bearing pressure of the ground (Q1) / the strength of the bearing pressure of the footing (Q2)” .
本発明の杭頭接合構造は、２個以上の弧状の杭頭支圧金具を用いるから、工事現場において杭頭に杭頭支圧金具を容易に取付けることができる。また本発明の杭頭支圧金具は、２個以上に分割した弧状の鋼板からなるから、鋼板を型抜きして製造するとき、無駄な鋼板を少なくすることができる。
本発明の杭頭接合構造は、杭頭の外周に２個以上の杭頭支圧金具を隙間を設けて配置し取付けてあるから、フーチングの構築時にコンクリートを打設すると、空気は杭頭支圧金具の下面に滞留することなくその隙間から放出され、フーチング内に空洞が生成することはない。したがって本発明の杭頭接合構造は、鋼管杭の先端の翼により付加された引抜方向支持力及び押込方向支持力に対応する引抜方向支持力及び押込方向支持力を奏する大きさの杭頭支圧金具を用いても、杭頭支圧金具の下面に空気が滞留することはない。
本発明の杭頭接合構造は、杭頭支圧金具の有効面積（Ｍ２）を、翼の有効面積（Ｍ１）の「地盤の支圧の強さ（Ｑ１）／フーチングの支圧の強さ（Ｑ２）」倍に設定してあるから、上部構造物の引抜荷重及び押込荷重によりフーチングが破壊する、或いは杭頭から抜けることがない。
Since the pile head joint structure of the present invention uses two or more arc-shaped pile head support fittings, the pile head support fitting can be easily attached to the pile head at a construction site. Moreover, since the pile head supporting metal fitting of this invention consists of an arc-shaped steel plate divided | segmented into two or more, when manufacturing a steel plate by die-cutting, it can reduce a useless steel plate.
In the pile head joint structure of the present invention, since two or more pile head support fittings are arranged and attached on the outer periphery of the pile head, when concrete is placed during the construction of the footing, the air is pile head support. It is discharged from the gap without staying on the lower surface of the press fitting, and no cavity is generated in the footing. Therefore, the pile head joint structure of the present invention is a pile head bearing pressure of a size that exerts a drawing direction supporting force and a pushing direction supporting force corresponding to the drawing direction supporting force and the pushing direction supporting force added by the blade at the tip of the steel pipe pile. Even if the bracket is used, air does not stay on the lower surface of the pile head bearing bracket.
In the pile head joint structure of the present invention, the effective area (M2) of the pile head bearing bracket is calculated by dividing the effective area (M1) of the wing by “the strength of the ground bearing pressure (Q1) / the strength of the bearing pressure of the footing ( Since Q2) "is set, the footing is not broken or pulled out from the pile head by the pull-out load and push-in load of the superstructure.
図１〜３により本発明の実施例に係る翼付鋼管杭の杭頭接合構造を説明する。 The pile head joint structure of the winged steel pipe pile which concerns on the Example of this invention with FIGS. 1-3 is demonstrated.
図１において、図１（ａ）は、地盤に埋設した翼付鋼管杭と杭頭接合構造の側面図（地盤とフーチングは断面図）である。図１（ｂ１）は、図１（ａ）のＡ２，Ａ２部分の矢印方向の断面図、図１（ｂ２）は、図１（ａ）の杭頭支圧金具の平面図、図１（ｃ）は、図１（ａ）のＡ３，Ａ３部分の矢印方向の断面図である。
翼付鋼管杭３１の杭頭には、その外周に杭頭支圧金具３３１，３３２をリング状に配置し溶接してある。３４１，３４２は、溶接により形成された溶接部である。杭頭支圧金具３３１，３３２は、ドーナツ状の鋼板を２分割したのと同じ形状の弧状（三日月状）鋼板からなり、翼付鋼管杭３１の杭軸と直交する方向へ鍔状に突出している。
1, FIG. 1 (a) is a side view of a winged steel pipe pile and a pile head joint structure embedded in the ground (the ground and the footing are sectional views). 1 (b1) is a cross-sectional view of the A2 and A2 portions in FIG. 1 (a) in the arrow direction, FIG. 1 (b2) is a plan view of the pile head supporting metal fitting in FIG. 1 (a), and FIG. ) Is a cross-sectional view of the A3 and A3 portions in FIG.
Pile head supporting metal fittings 331 and 332 are arranged on the outer periphery of the pile head of the winged steel pipe pile 31 and welded. Reference numerals 341 and 342 denote welds formed by welding. The pile head support fittings 331 and 332 are made of arc-shaped (crescent-shaped) steel plates having the same shape as a donut-shaped steel plate divided into two, and project in a hook shape in a direction perpendicular to the pile axis of the winged steel pipe pile 31. Yes.
杭頭支圧金具３３１，３３２の翼付鋼管杭３１の外周に接触する部分（内側の外周）３３４の曲率半径は、翼付鋼管杭３１の外周の曲率半径とほぼ同じ（外周の曲率半径と同じか少し大きい）である。翼付鋼管杭３１の外周に取付けた杭頭支圧金具３３１，３３２は、両杭頭支圧金具の端部３３５(内側の外周３３４と直交する端面)の間に隙間３３３(例えば１０ｍｍ程度)を設けてある。即ち杭頭支圧金具３３１，３３２は、隙間３３３を設けて翼付鋼管杭３１の杭頭の外周にリング状に配置して取付けてある。
また翼付鋼管杭３１の先端には、２個の翼３２１、３２２を取付けてある。
The curvature radius of the portion (inner outer periphery) 334 that contacts the outer periphery of the winged steel pipe pile 31 of the pile head bearing brackets 331 and 332 is substantially the same as the curvature radius of the outer periphery of the winged steel pipe pile 31 (the curvature radius of the outer periphery) Same or a little bigger). Pile head bearing fittings 331 and 332 attached to the outer periphery of the winged steel pipe pile 31 have a gap 333 (for example, about 10 mm) between the end portions 335 (end surfaces orthogonal to the inner outer circumference 334) of both pile head bearing fittings. Is provided. In other words, the pile head supporting metal fittings 331 and 332 are arranged in a ring shape on the outer periphery of the pile head of the winged steel pipe pile 31 with a gap 333.
Two wings 321 and 322 are attached to the tip of the winged steel pipe pile 31.
杭頭支圧金具３３１，３３２の端部３３５は、隙間３３３離れて対向するから、フーチング２１を構築するときコンクリートを打設すると、杭頭支圧金具３３１，３３２の下面部２１２の空気は、隙間３３３から放出され、下面部２１２に滞留することがない。即ち隙間３３３は、空気放出部となる。また杭頭支圧金具３３１，３３２は、２個に分かれているから、内側の外周３３４を翼付鋼管杭３１の外周に接触させて溶接するのみで取り付けることができ、従来のリング状フランジのように翼付鋼管杭３１に嵌め込む必要がないから、翼付鋼管杭３１の外周に容易に取付けることができる。 Since the end portions 335 of the pile head bearing members 331 and 332 face each other apart from the gap 333, when concrete is placed when the footing 21 is constructed, the air on the lower surface portion 212 of the pile head bearing members 331 and 332 is It is discharged from the gap 333 and does not stay on the lower surface portion 212. That is, the gap 333 becomes an air discharge portion. Moreover, since the pile head bearing fittings 331 and 332 are divided into two parts, they can be attached simply by bringing the outer periphery 334 on the inner side into contact with the outer periphery of the winged steel pipe pile 31 and welding. Thus, since it is not necessary to fit in the winged steel pipe pile 31, it can be easily attached to the outer periphery of the winged steel pipe pile 31.
図２は、図１において、杭頭支圧金具３３１，３３２の取付け位置を杭軸の上下方向にずらした例で、他の構成は、図１と同じである。なお図２は、図１の一部を省略してある。
図１の杭頭支圧金具３３１，３３２は、杭軸（長手方向）と直交する面上にリング状に配置して隙間３３３を設けてあるが、図２の杭頭支圧金具３３１，３３２は、杭軸の上下方向にずらして図２のようにリング状に配置し、両杭頭支圧金具の間に隙間３３６を設けてある。即ち杭頭支圧金具３３１，３３２は、図１も図２も、杭頭から杭軸方向を見てリング状に配置してある。隙間３３６は、隙間３３３と同様に、フーチング２１の構築時にコンクリートを打設すると、空気放出部として作用する。
FIG. 2 is an example in which the mounting position of the pile head supporting metal fittings 331 and 332 is shifted in the vertical direction of the pile shaft in FIG. 1, and the other configuration is the same as FIG. In FIG. 2, a part of FIG. 1 is omitted.
The pile head support fittings 331 and 332 of FIG. 1 are arranged in a ring shape on a surface orthogonal to the pile axis (longitudinal direction) and provided with a gap 333, but the pile head support fittings 331 and 332 of FIG. Is arranged in a ring shape as shown in FIG. 2 while being shifted in the vertical direction of the pile shaft, and a gap 336 is provided between both pile head support fittings. That is, the pile head supporting metal fittings 331 and 332 are arranged in a ring shape when viewed from the pile head in the pile axis direction in both FIGS. Similar to the gap 333, the gap 336 acts as an air discharge portion when concrete is placed when the footing 21 is constructed.
杭頭支圧金具３３１，３３２や従来のフランジ１２は、図３のように鋼板５１，５２を型抜きして形成するが、その際従来のフランジ１２の場合、図３（ｂ）のように鋼板５２の円板部５２１（直径は鋼管杭の外径に相当する）の部分が無駄になるが、杭頭支圧金具３３１，３３２の場合、図３（ａ）のように双方の杭頭支圧金具が噛み合うように型抜きできるから、鋼板５１の無駄が少なくなる。 The pile head supporting metal fittings 331 and 332 and the conventional flange 12 are formed by punching the steel plates 51 and 52 as shown in FIG. 3. In this case, in the case of the conventional flange 12, as shown in FIG. Although the part of the disc part 521 (the diameter corresponds to the outer diameter of the steel pipe pile) of the steel plate 52 is wasted, in the case of the pile head bearing members 331 and 332, both pile heads as shown in FIG. Since the die can be punched so that the support metal fittings mesh with each other, the waste of the steel plate 51 is reduced.
次に翼３２１，３２２の引抜方向支持力と杭頭支圧金具３３１，３３２の引抜方向支持力について説明する。
なお以下引抜方向支持力について説明するが、押込方向支持力についても同じである。
翼３２１，３２２の引抜方向支持力ｔＲａ１（ｋＮ）は、次式で表すことができる。
ｔＲａ１＝（２／３）ｋ１・Ｎｔ１・Ｍ１＋Ｗｐ＝Ｑ１・Ｍ１＋Ｗｐ・・・・（１）
ここで、ｋ１：地盤の杭先端の抵抗係数
Ｎｔ１：地盤の平均Ｎ値（平均打撃回数）
Ｍ１：翼３２１，３２２の有効面積（両翼合計の有効面積）（ｍ2）
Ｗｐ：杭の自重（ｋＮ）
Ｑ１：地盤の支圧の強さ＝（２／３）ｋ１・Ｎｔ１
なお翼３２１，３２２の有効面積Ｍ１は、翼３２１，３２２の翼付鋼管杭３１の外周より外側の部分の面積である。
Next, the drawing direction support force of the blades 321 and 322 and the drawing direction support force of the pile head supporting metal fittings 331 and 332 will be described.
The drawing direction supporting force will be described below, but the same applies to the pushing direction supporting force.
The drawing direction support force tRa1 (kN) of the blades 321 and 322 can be expressed by the following equation.
tRa1 = (2/3) k1 · Nt1 · M1 + Wp = Q1 · M1 + Wp (1)
Here, k1: resistance coefficient of the pile tip of the ground Nt1: average N value of the ground (average hitting frequency)
M1: Effective area of blades 321 and 322 (total effective area of both blades) (m 2 )
Wp: Weight of the pile (kN)
Q1: Strength of ground support = (2/3) k1 · Nt1
The effective area M1 of the blades 321 and 322 is the area of the portion outside the outer periphery of the bladed steel pipe pile 31 of the blades 321 and 322.
一方フーチング２１内の杭頭支圧金具３３１，３３２の引抜方向支持力ｔＲａ２（ｋＮ）は、次式で表すことができる。
ｔＲａ２＝（２／３）ｋ２・Ｎｔ２・Ｍ２＋Ｗｐ＝Ｑ２・Ｍ２＋Ｗｐ・・・・（２）
ここで、ｋ２：フーチング（コンクリート）の杭先端の抵抗係数
Ｎｔ２：フーチング（コンクリート）の平均Ｎ値（平均打撃回数）
Ｍ２：杭頭支圧金具３３１，３３２の有効面積（両杭頭支圧金具合計の有効面積）（ｍ2）
Ｗｐ：杭の自重（ｋＮ）
Ｑ２：フーチング（コンクリート）の支圧の強さ＝（２／３）ｋ２・Ｎｔ２
なお杭頭支圧金具３３１，３３２の有効面積Ｍ２は、翼付鋼管杭３１の杭軸と直交する面の面積であり、隙間３３３の面積は含まない。
On the other hand, the pulling direction supporting force tRa2 (kN) of the pile head supporting metal fittings 331 and 332 in the footing 21 can be expressed by the following equation.
tRa2 = (2/3) k2 / Nt2 / M2 + Wp = Q2 / M2 + Wp (2)
Here, k2: resistance coefficient of foot of pile of footing (concrete) Nt2: average N value of footing (concrete) (average hitting frequency)
M2: Effective area of pile head bearing brackets 331, 332 (total effective area of both pile head bearing brackets) (m 2 )
Wp: Weight of the pile (kN)
Q2: Footing (concrete) bearing strength = (2/3) k2 / Nt2
In addition, the effective area M2 of the pile head supporting metal fittings 331 and 332 is an area of the surface orthogonal to the pile axis of the winged steel pipe pile 31, and does not include the area of the gap 333.
翼３２１，３２２の引抜方向支持力がｔＲａ１の場合、フーチング２１が上部構造物の引抜荷重により破壊しない、或いは杭頭から抜けないようにするには、
ｔＲａ２＝ｔＲａ１・・・・・・・・・・・・・・・・・・・・・・（３）
となるように杭頭支圧金具３３１，３３２の有効面積Ｍ２を設定すればよい。
式（１）、（２）において杭の自重Ｗｐを省略すると、（３）式は、
Ｑ２・Ｍ２ ＝ Ｑ１・Ｍ１・・・・・・・・・・・・・・・・・・（４）
となり、そのときの杭頭支圧金具３３１，３３２の有効面積Ｍ２は、
Ｍ２＝（Ｑ１／Ｑ２）・Ｍ１・・・・・・・・・・・・・・・・・（５）
となる。
したがって杭頭支圧金具３３１，３３２の有効面積Ｍ２を、少なくとも翼３２１，３２２の有効面積Ｍ１の（Ｑ１／Ｑ２）倍に設定すると、フーチング２１は上部構造物の引抜荷重により破壊する或いは杭頭から抜けることはない。即ち杭頭支圧金具３３１，３３２の有効面積Ｍ２は、（Ｑ１／Ｑ２）・Ｍ１に設定するか、或いはＱ１／Ｑ２）・Ｍ１よりも大きく設定する。
In order to prevent the footing 21 from being broken by the pulling load of the upper structure or coming out of the pile head when the supporting force in the pulling direction of the blades 321 and 322 is tRa1,
tRa2 = tRa1 (3)
What is necessary is just to set the effective area M2 of the pile head support metal fittings 331,332 so that it may become.
If the weight Wp of the pile is omitted in the equations (1) and (2), the equation (3) is
Q2 / M2 = Q1 / M1 (4)
The effective area M2 of the pile head supporting metal fittings 331 and 332 at that time is
M2 = (Q1 / Q2) ・ M1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ (5)
It becomes.
Therefore, if the effective area M2 of the pile head supporting metal fittings 331 and 332 is set to at least (Q1 / Q2) times the effective area M1 of the blades 321 and 322, the footing 21 breaks due to the pulling load of the superstructure or the pile head Never get out of it. That is, the effective area M2 of the pile head supporting metal fittings 331 and 332 is set to (Q1 / Q2) · M1, or is set larger than Q1 / Q2) · M1.
なお通常、地盤の支圧の強さＱ１＜コンクリートの支圧の強さＱ２となるから、杭頭支圧金具３３１，３３２は、翼３２１，３２２に比べて面積を小さくすることができる。
また本実施例の杭頭接合構造は、杭頭支圧金具３３１，３３２の端部３３５の間に隙間３３３、又は隙間３３６を設けてあるから、鋼管杭の先端の翼により付加された引抜方向支持力に対応する引抜方向支持力を奏する大きさの杭頭支圧金具を杭頭の周囲に鍔状に取付けても、フーチング２１のコンクリート打設時に杭頭支圧金具３３１，３３２の下面に空気が滞留することはない。
Usually, since the ground bearing pressure Q1 <the concrete bearing strength Q2, the pile head bearing brackets 331 and 332 can have a smaller area than the blades 321 and 322.
Moreover, since the gap head 333 or the gap 336 is provided between the end portions 335 of the pile head bearing members 331 and 332 in the pile head joint structure of the present embodiment, the pulling direction added by the blade at the tip of the steel pipe pile Even if a pile head supporting metal fitting having a size that provides a supporting force in the pulling direction corresponding to the supporting force is attached in a bowl shape around the pile head, the pile head supporting metal fittings 331 and 332 are placed on the lower surface of the footing 21 when the concrete is placed. Air does not stay.
前記実施例は、２個の杭頭支圧金具３３１，３３２を用いる例について説明したが、杭頭支圧金具の個数は、２個に限らず２個以上でよい。
また翼３２１，３２２の形状は、図１の形状に限らず、従来提案されている種々の形状の翼であっても良い。
Although the said Example demonstrated the example using the two pile head bearing metal fittings 331 and 332, the number of pile head bearing metal fittings is not restricted to two, Two or more may be sufficient.
The shape of the wings 321 and 322 is not limited to the shape shown in FIG.
２１ フーチング
２２ 地盤
３１ 翼付鋼管杭
３２１，３２２ 杭先端の翼
３３１，３３２ 杭頭支圧金具
３３３ 隙間３３４ 杭頭支圧金具の内側の外周（翼付鋼管杭３１の外周に接触する部分）
３３５ 杭頭支圧金具３３１，３３２の端部
３３６ 隙間
３４１，３４２ 溶接部
５１，５２ 鋼板
21 Footing 22 Ground 31 Winged steel pipe piles 321 and 322 Wings 331 and 332 at the tip of the pile Pile head bearing fitting 333 Clearance 334 The outer circumference inside the pile head bearing fitting (the part in contact with the outer circumference of the winged steel pipe pile 31)
335 Ends 336 of pile head bearing fittings 331 and 332 Clearances 341 and 342 Welded portions 51 and 52 Steel plate
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