JP4828307B2 - Pile head joint structure and joint material used therefor - Google Patents

Pile head joint structure and joint material used therefor Download PDF

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JP4828307B2
JP4828307B2 JP2006151367A JP2006151367A JP4828307B2 JP 4828307 B2 JP4828307 B2 JP 4828307B2 JP 2006151367 A JP2006151367 A JP 2006151367A JP 2006151367 A JP2006151367 A JP 2006151367A JP 4828307 B2 JP4828307 B2 JP 4828307B2
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治克 角屋
貴章 平山
亨 渡辺
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岡部株式会社
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Description

本発明は、杭頭接合構造及びそれに用いる接合材に関する。   The present invention relates to a pile head joint structure and a joint material used therefor.

杭基礎には支持杭形式と摩擦杭形式とがあり、前者は、良質な支持層が地下深くにある場合に該支持層まで打ち込んだ杭の上に上部構造物を構築することによって、構造物重量を支持層で安定支持する形式であり、後者は、良質な支持層がない場合に周辺地盤との摩擦力によって上部構造物を支持する形式の基礎形式である。   There are two types of pile foundations: a support pile type and a friction pile type. When the good quality support layer is deep underground, the former is constructed by constructing an upper structure on the pile driven to the support layer. This is a form in which the weight is stably supported by the support layer, and the latter is a basic form in which the superstructure is supported by the frictional force with the surrounding ground when there is no good quality support layer.

これらの杭は、その杭頭にて上部構造物の基礎スラブや基礎梁に接合されるが、かかる接合部においては、長期荷重として圧縮力が作用するほか、地震時には、上部構造物の転倒モーメントに起因する引抜き力、水平力に起因するせん断力あるいは曲げモーメントが作用する。   These piles are joined to the foundation slab or foundation beam of the superstructure at the head of the pile. At such joints, a compressive force acts as a long-term load. Pull-out force due to, shear force or bending moment due to horizontal force acts.

そして、上部構造物がきわめて大きな地震に遭遇した場合には、杭頭に過大なせん断力や曲げモーメントが作用し、杭の破壊ひいては上部構造物の倒壊といった不測の事態を招くおそれがある。   When the superstructure encounters an extremely large earthquake, an excessive shearing force or bending moment acts on the pile head, which may lead to an unexpected situation such as destruction of the pile and eventually collapse of the superstructure.

また、杭頭接合部を設計する際、一般的には剛接とみなすことが多いが、杭の頭部と上部構造物とを完全に剛接合にすることは困難であって実際の接合度は１未満、例えば０．８〜０．９程度になることが多いため、杭頭接合部が本来負担すべき曲げモーメントが杭頭に流れ、結果として設計時に想定したよりも大きな曲げモーメントが杭頭に作用することがあり、上述した大地震時の過大な曲げモーメントと相まって、杭の破壊や上部構造物の倒壊といった懸念がさらに増加する。   Also, when designing pile head joints, it is generally considered to be a rigid joint, but it is difficult to make the pile head and the upper structure completely rigid joints. Is often less than 1, for example, about 0.8 to 0.9. Therefore, the bending moment that should be borne by the pile head joint flows to the pile head, resulting in a larger bending moment than assumed at the time of design. It may act on the head, and coupled with the excessive bending moment at the time of the large earthquake described above, the concerns such as the destruction of the pile and the collapse of the superstructure are further increased.

そこで、最近では、杭頭で発生する曲げモーメントを低減すべく、杭頭の端板に立設された異形スタッドの一部を切削加工したり、杭頭鉄筋の一部を筒体（シース管、スリーブ）内に配置したり、アンカーボルトにアスファルトを塗布したりすることで、基礎スラブを構成するコンクリートと異形スタッドや杭頭鉄筋あるいはアンカーボルトとの付着力を弱めあるいは付着を切る、いわゆるアンボンド処理が行われるようになってきた。   Therefore, recently, in order to reduce the bending moment generated at the pile head, a part of the deformed stud standing on the end plate of the pile head is cut or a part of the pile head rebar is a cylinder (sheath tube). , Sleeve) or by applying asphalt to the anchor bolts to weaken or cut the adhesion between the concrete constituting the foundation slab and deformed studs, pile head reinforcement or anchor bolts. Processing has come to be performed.

かかるアンボンド処理を行うことにより、杭頭に発生する曲げモーメントを低減することが可能となる。   By performing such an unbonding process, it is possible to reduce the bending moment generated at the pile head.

特開２０００−１４４７６３JP2000-144663

特開２００２−３１７４５４JP 2002-317454 A

しかしながら、このようなアンボンド処理によって杭頭接合部の固定度を緩和し発生曲げモーメントを低減することができたとしても、固定度を算出するにあたっては、アンカーの本数、径、定着板の形状その他様々な条件を考慮せねばならないため、その手順は複雑となり、それゆえ適切な設計手法が未だ確立できていないのが現状である。   However, even if the unbonding process eases the fixation of the pile head joint and reduces the generated bending moment, the number of anchors, the diameter, the shape of the fixing plate, etc. Since various conditions must be taken into consideration, the procedure is complicated, and therefore, an appropriate design method has not yet been established.

また、上述したアンボンド処理は、異形スタッドを切削加工したり筒体を配置したりするのに手間とコストがかかり、経済的な観点で改善の余地があった。そして何より、異形スタッド、鉄筋あるいはアンカーボルトといった鋼棒がコンクリートの中性化等によって経年的に腐食膨張するとともに該腐食膨張に起因してコンクリートとの付着が生じ、その結果、アンボンド状態を長期間維持することが困難であるという問題も生じていた。   In addition, the above-described unbonding process requires labor and cost to cut a deformed stud or dispose a cylindrical body, and there is room for improvement from an economical viewpoint. Above all, steel rods such as deformed studs, reinforcing bars or anchor bolts corrode and expand over time due to the neutralization of concrete and the like, resulting in adhesion to concrete due to the corrosion expansion. There was also a problem that it was difficult to maintain.

本発明は、上述した事情を考慮してなされたもので、アンボンド処理を行わずとも杭頭接合部の固定度を低減させることが可能な杭頭接合構造及びそれに用いる接合材を提供することを目的とする。   The present invention has been made in consideration of the above-described circumstances, and provides a pile head joint structure capable of reducing the fixing degree of the pile head joint portion without performing an unbonding process, and a joint material used therefor. Objective.

上記目的を達成するため、本発明に係る接合材は請求項１に記載したように、杭の頭部に設けられた端板に接合される固定度低減用平板と、該固定度低減用平板に立設され前記杭で支持される上部構造物の基礎部材に埋設されるアンカーボルトとを備え、地震時水平力が前記上部構造物から前記杭の頭部に作用したとき、前記固定度低減用平板が面外に曲げ変形して前記杭の頭部が回転するように構成した接合材であって、
前記固定度低減用平板を円環状に形成するとともに内側縁部から半径方向外側に向かって延びるスリットを複数形成して構成し、該スリットで挟まれた舌状体に前記アンカーボルトを立設したものである。 In order to achieve the above object, the bonding material according to the present invention, as described in claim 1, is a fixed degree reducing flat plate joined to an end plate provided on the head of the pile, and the fixed degree reducing flat plate. Anchor bolts embedded in the foundation member of the upper structure that is erected on and supported by the pile, and when the horizontal force during an earthquake acts on the head of the pile from the upper structure, the fixing degree is reduced. It is a joining material configured such that the flat plate for bending is deformed out of plane and the head of the pile rotates.
The fixing degree reducing flat plate is formed in an annular shape, and a plurality of slits extending radially outward from the inner edge are formed, and the anchor bolt is erected on a tongue-like body sandwiched between the slits. Is.

また、本発明に係る接合材は、前記杭の断面中心から前記杭の中空内面までの距離をｒ 1 としたとき、前記杭の断面中心から前記アンカーボルトの材軸までの距離Ｒが、
Ｒ＜ｒ 1
となるように、前記アンカーボルトを前記固定度低減用平板に立設したものである。 Further, the bonding material according to the present invention, when the distance from the cross-sectional center of the pile to the hollow inner surface of the pile and the r 1, the distance R from the center of the cross section of the said pile to a timber axis of the anchor bolt,
R <r 1
Thus, the anchor bolt is erected on the flatness for reducing the fixing degree.

また、本発明に係る接合材は請求項３に記載したように、杭の頭部に設けられた端板に剛接合される固定度低減用平板と、該固定度低減用平板に立設され前記杭で支持される上部構造物の基礎部材に埋設されるアンカーボルトとを備え、地震時水平力が前記上部構造物から前記杭の頭部に作用したとき、前記固定度低減用平板が面外に曲げ変形して前記杭の頭部が回転するように構成した接合材であって、Further, as described in claim 3, the bonding material according to the present invention is erected on the fixing degree reducing flat plate rigidly joined to the end plate provided on the head of the pile, and the fixing degree reducing flat plate. Anchor bolts embedded in the foundation member of the upper structure supported by the pile, and when the horizontal force during an earthquake acts on the head of the pile from the upper structure, the fixing degree reducing flat plate is a surface. It is a joining material configured to bend and deform outward and the head of the pile to rotate,
前記杭の断面中心から前記杭の中空内面までの距離をｒ  The distance from the cross-sectional center of the pile to the hollow inner surface of the pile is r 11 、前記杭の外面までの距離をｒ, R is the distance to the outer surface of the pile 22 としたとき、前記杭の断面中心から前記アンカーボルトの材軸までの距離Ｒが、When the distance R from the cross-sectional center of the pile to the material axis of the anchor bolt,
Ｒ＜ｒ    R <r 11 又は ｒ  Or r 22 ＜Ｒ<R
となるように、前記アンカーボルトを前記固定度低減用平板に立設するとともに、前記固定度低減用平板を、全体が円環状でそれぞれ扇状をなす複数の分割片で構成し該分割片のそれぞれに前記アンカーボルトを立設したものである。The anchor bolt is erected on the fixing degree reducing flat plate, and the fixing degree reducing flat plate is configured by a plurality of divided pieces each having an annular shape and a fan shape, and each of the divided pieces. The anchor bolt is installed upright.

また、本発明に係る接合材は請求項４に記載したように、杭の頭部に設けられた端板に剛接合される固定度低減用平板と、該固定度低減用平板に立設され前記杭で支持される上部構造物の基礎部材に埋設されるアンカーボルトとを備え、地震時水平力が前記上部構造物から前記杭の頭部に作用したとき、前記固定度低減用平板が面外に曲げ変形して前記杭の頭部が回転するように構成した接合材であって、Further, as described in claim 4, the bonding material according to the present invention is erected on the fixing degree reducing flat plate rigidly joined to the end plate provided on the head of the pile, and the fixing degree reducing flat plate. Anchor bolts embedded in the foundation member of the upper structure supported by the pile, and when the horizontal force during an earthquake acts on the head of the pile from the upper structure, the fixing degree reducing flat plate is a surface. It is a joining material configured to bend and deform outward and the head of the pile to rotate,
前記杭の断面中心から前記杭の中空内面までの距離をｒ  The distance from the cross-sectional center of the pile to the hollow inner surface of the pile is r 11 、前記杭の外面までの距離をｒ, R is the distance to the outer surface of the pile 22 としたとき、前記杭の断面中心から前記アンカーボルトの材軸までの距離Ｒが、When the distance R from the cross-sectional center of the pile to the material axis of the anchor bolt,
Ｒ＜ｒ    R <r 11 又は ｒ  Or r 22 ＜Ｒ<R
となるように、前記アンカーボルトを前記固定度低減用平板に立設するとともに、前記固定度低減用平板を複数の舌片で構成し該各舌片に前記アンカーボルトを立設したものである。The anchor bolt is erected on the fixing degree reducing flat plate, the fixing degree reducing flat plate is constituted by a plurality of tongue pieces, and the anchor bolt is erected on each tongue piece. .

また、本発明に係る接合材は、前記距離Ｒが、Further, in the bonding material according to the present invention, the distance R is
Ｒ＜ｒ    R <r 11
となるように、前記アンカーボルトを前記固定度低減用平板に立設したものである。Thus, the anchor bolt is erected on the flatness for reducing the fixing degree.

また、本発明に係る接合材は、前記杭の頭部を前記基礎部材に埋設したものである。Moreover, the joining material which concerns on this invention embeds the head of the said pile in the said base member.

また、本発明に係る杭頭接合構造は請求項７に記載したように、請求項１乃至請求項６のいずれか一記載の接合材の固定度低減用平板を前記杭の頭部に設けられた端板に接合するとともに該接合材を構成するアンカーボルトが前記杭で支持される上部構造物の基礎部材に埋設されるようにしたものである。   Moreover, the pile head joining structure which concerns on this invention is provided with the flat plate for fixed degree reduction of the joining material as described in any one of Claim 1 thru | or 6 in the head of the said pile, as described in Claim 7. The anchor bolts that are joined to the end plate and that constitute the joining material are embedded in the foundation member of the upper structure supported by the pile.

本発明に係る杭頭接合構造及びそれに用いる接合材は、地震時水平力が上部構造物から杭の頭部に作用したとき、該杭頭に設けられた端板に接合してある固定度低減用平板が面外に曲げ変形して杭頭が回転するように接合材を構成してある。   The pile head joint structure according to the present invention and the joint material used therefor are reduced in the degree of fixation that is joined to an end plate provided on the pile head when a horizontal force during an earthquake acts on the head of the pile from the upper structure. The joining material is configured so that the flat plate for bending bends out of the plane and the pile head rotates.

このようにすると、杭頭の回転変形に対する発生曲げモーメント、換言すれば回転剛性は、固定度低減用平板の面外曲げ剛性として評価することができるため、平面形状、厚み及び鋼材種類や、変形拘束位置、すなわち、アンカーボルトの設置位置といった固定度低減用平板に関する諸データだけで杭頭の回転剛性を算出することが可能となり、かくして杭頭における固定度低減の程度を容易に把握することができる。   In this way, the generated bending moment with respect to the rotational deformation of the pile head, in other words, the rotational rigidity can be evaluated as the out-of-plane bending rigidity of the flatness for reducing the degree of fixation. It is possible to calculate the rotational rigidity of the pile head only with various data related to the fixing position reduction plate such as the restraint position, that is, the installation position of the anchor bolt, and thus it is possible to easily grasp the degree of fixing degree reduction at the pile head. it can.

ここで、前記杭の断面中心から前記杭の中空内面までの距離をｒ1、前記杭の外面までの距離をｒ2としたとき、前記杭の断面中心から前記アンカーボルトの材軸までの距離Ｒが、
Ｒ＜ｒ1 又は ｒ2＜Ｒ
となるように、前記アンカーボルトを前記固定度低減用平板に立設したならば、固定度低減用平板の面外曲げ変形は、杭の中空内部又は外側で生じることとなり、その変形量を大きくとることができる。 Here, when r 1 a distance from the cross-sectional center of the pile to the hollow inner surface of the pile, the distance to the outer surface of the pile was r 2, the distance from the cross-sectional center of the pile to the timber axis of the anchor bolt R is
R <r 1 or r 2 <R
If the anchor bolt is erected on the fixed degree reducing flat plate, the out-of-plane bending deformation of the fixed degree reducing flat plate occurs inside or outside the pile, and the amount of deformation is increased. Can take.

固定度低減用平板は上述したように、面外に曲げ変形して杭頭が回転するように構成するが、さらに、全体が円環状でそれぞれ扇状をなす複数の分割片で構成し、円環状に形成するとともに内側縁部から半径方向外側に向かって延びるスリットを複数形成して構成し、又は複数の舌片で構成することにより、アンカーボルトが立設される分割片、スリット間の舌状体及び舌片がそれぞれ個別に面外曲げ変形するため、固定度低減用平板の曲げ変形が生じやすくなり、接合度の低減が容易になるとともに、個別に変形するがゆえに面外曲げ挙動が把握しやすくなり、杭頭の曲げ剛性をより正確に把握することが可能となる。 As described above, the fixing degree reducing flat plate is configured to be bent and deformed out of the plane so that the pile head rotates , and further, it is configured by a plurality of divided pieces each having an annular shape and a fan shape. And a plurality of slits extending radially outward from the inner edge, or a plurality of tongue pieces, so that the anchor bolt is erected, and the tongue shape between the slits. Since the body and tongue are individually bent out-of-plane, it is easy to cause bending deformation of the flat plate for reducing the degree of fixation, and it is easy to reduce the degree of bonding, and because of the individual deformation, grasp the out-of-plane bending behavior. This makes it easier to grasp the bending rigidity of the pile head.

以下、本発明に係る杭頭接合構造及びそれに用いる接合材の実施の形態について、添付図面を参照して説明する。なお、従来技術と実質的に同一の部品等については同一の符号を付してその説明を省略する。   Hereinafter, an embodiment of a pile head joint structure according to the present invention and a joint material used therefor will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

図１及び図２は、本実施形態に係る杭頭接合構造及びそれに用いる接合材を示した図である。同図でわかるように、本実施形態に係る接合材１は、固定度低減用平板２と該固定度低減用平板に立設されたアンカーボルト３とを備えるとともに、本実施形態に係る杭頭接合構造４は、固定度低減用平板２を、ＰＨＣ杭である杭５の頭部６（以下、杭頭６）に設けられた端板７に重ねた状態でボルト１０で該端板に接合してあるとともに、杭５で支持される上部構造物８の基礎部材である基礎梁９にアンカーボルト３を埋設して構成してある。   FIG.1 and FIG.2 is the figure which showed the pile head junction structure which concerns on this embodiment, and the joining material used for it. As can be seen from the figure, the bonding material 1 according to the present embodiment includes a fixing degree reducing flat plate 2 and anchor bolts 3 erected on the fixing degree reducing flat plate, and a pile head according to the present embodiment. The joining structure 4 joins the fixing plate 2 to the end plate with bolts 10 in a state where the fixing plate 2 is overlapped with an end plate 7 provided on a head 6 (hereinafter referred to as a pile head 6) of a pile 5 which is a PHC pile. In addition, the anchor bolt 3 is embedded in the foundation beam 9 which is the foundation member of the upper structure 8 supported by the pile 5.

固定度低減用平板２は、外径Ｒ2が杭５の外径ｒ2（図ではそれぞれ半径をなしている）と等しく、内径Ｒ1が杭５の内径ｒ1（図ではそれぞれ半径をなしている）よりも小さな円環状の鋼材で形成してあり、杭５のＰＣ鋼線設置位置に対応する箇所に穿孔された挿通孔１１にボルト１０を挿通し端板２に形成されたボルト孔１２にねじ込むことで、端板７に固定できるようになっている。 The fixing degree reducing flat plate 2 has an outer diameter R 2 equal to the outer diameter r 2 of the pile 5 (in the figure, each has a radius), and an inner diameter R 1 has an inner diameter r 1 of the pile 5 (in the figure, each has a radius). Bolt hole formed in the end plate 2 by inserting the bolt 10 into the insertion hole 11 drilled in the place corresponding to the PC steel wire installation position of the pile 5. It can be fixed to the end plate 7 by being screwed into 12.

固定度低減用平板２には、アンカーボルト３が挿通されるボルト孔１３を設けてあり、該ボルト孔にアンカーボルト３を挿通してナット１４，１４を螺合することでアンカーボルト３を固定度低減用平板２に立設できるようになっている。   The fixing degree reduction flat plate 2 is provided with a bolt hole 13 through which the anchor bolt 3 is inserted, and the anchor bolt 3 is fixed by inserting the anchor bolt 3 into the bolt hole and screwing the nuts 14 and 14 together. It is possible to stand on the flat plate 2 for reducing the degree.

ここで、ボルト孔１３は、杭５の断面中心からの距離、換言すればアンカーボルト３の取付け半径Ｒが杭５の内径ｒ1よりも小さくなるように位置決めしてある。そして、かかる構成により、アンカーボルト３の立設位置は、杭５の内周面よりも内側となる。 Here, the bolt hole 13 is positioned so that the distance from the cross-sectional center of the pile 5, in other words, the mounting radius R of the anchor bolt 3 is smaller than the inner diameter r 1 of the pile 5. With this configuration, the standing position of the anchor bolt 3 is on the inner side of the inner peripheral surface of the pile 5.

本実施形態に係る杭頭接合構造４及びそれに用いる接合材１は、上述した構成により、地震時水平力が上部構造物９から杭頭６に作用したとき、杭頭６の端板７に重ねて接合してある固定度低減用平板２は、図３に示すように面外に曲げ変形するとともに、それに伴って杭頭６に回転変形が生じる。   The pile head joint structure 4 according to the present embodiment and the joining material 1 used for the pile head are overlapped on the end plate 7 of the pile head 6 when the earthquake horizontal force acts on the pile head 6 from the upper structure 9 by the above-described configuration. As shown in FIG. 3, the fixed degree reducing flat plate 2 joined together is bent and deformed out of the plane, and accordingly, the pile head 6 undergoes rotational deformation.

したがって、基礎梁９に対する杭頭６の接合度は緩和され、いわゆる半剛接合となる。加えて、杭頭６の回転角θに対する発生曲げモーメントＭ、換言すれば杭頭６における回転剛性は、固定度低減用平板２の面外曲げ剛性として評価することが可能となる。   Therefore, the joint degree of the pile head 6 to the foundation beam 9 is relaxed, and a so-called semi-rigid joint is obtained. In addition, the generated bending moment M with respect to the rotation angle θ of the pile head 6, in other words, the rotational rigidity of the pile head 6 can be evaluated as the out-of-plane bending rigidity of the fixing degree reducing flat plate 2.

以上説明したように、本実施形態に係る杭頭接合構造４及びそれに用いる接合材１によれば、従来のような複雑で手間のかかるアンボンド処理を行わなくても、基礎梁９に対する杭頭６の接合度が従来よりも大幅に緩和され、いわゆる半剛接合を実現することが可能となる。   As described above, according to the pile head joint structure 4 and the bonding material 1 used therefor according to the present embodiment, the pile head 6 with respect to the foundation beam 9 can be obtained without performing a complicated and troublesome unbonding process as in the prior art. The degree of joining is greatly relaxed compared to the prior art, and so-called semi-rigid joining can be realized.

また、本実施形態に係る杭頭接合構造４及びそれに用いる接合材１によれば、杭頭６の回転角θに対する発生曲げモーメントＭ、換言すれば杭頭６における回転剛性は、固定度低減用平板２の面外曲げ剛性として評価することが可能となる。   Moreover, according to the pile head joint structure 4 and the bonding material 1 used therefor according to the present embodiment, the generated bending moment M with respect to the rotation angle θ of the pile head 6, in other words, the rotational rigidity of the pile head 6 is for fixing degree reduction. It becomes possible to evaluate as the out-of-plane bending rigidity of the flat plate 2.

そのため、固定度低減用平板２の平面形状、厚み及び鋼材種類や、変形拘束位置、すなわち、アンカーボルト３の取付け位置といった固定度低減用平板２に関する諸データだけで杭頭６の回転剛性を算出することが可能となり、かくして杭頭６における固定度低減の程度を容易に把握することができる。   Therefore, the rotational rigidity of the pile head 6 is calculated only from various data relating to the flatness 2 for fixing degree reduction, such as the planar shape, thickness and steel material type of the fixing degree reducing flat plate 2 and the deformation restraint position, that is, the mounting position of the anchor bolt 3. Thus, it is possible to easily grasp the degree of fixing degree reduction in the pile head 6.

本実施形態では、ナット１４，１４を用いたボルト接合でアンカーボルト３を固定度低減用平板２に立設するようにしたが、これに代えて、アンカーボルト３の下端を固定度低減用平板２の上面に溶接することでアンカーボルト３を固定度低減用平板２に立設するようにしてもかまわない。   In this embodiment, the anchor bolt 3 is erected on the fixing degree reducing flat plate 2 by bolt joining using the nuts 14, 14, but instead, the lower end of the anchor bolt 3 is connected to the fixing degree reducing flat plate. The anchor bolt 3 may be erected on the flat plate 2 for fixing degree reduction by welding to the upper surface of 2.

また、本実施形態では、固定度低減用平板２を端板７にボルト接合するようにしたが、ボルト接合に代えて溶接により接合するようにしてもかまわない。   In the present embodiment, the fixing degree reducing flat plate 2 is bolted to the end plate 7. However, the fixing degree reducing flat plate 2 may be welded instead of the bolt.

また、本実施形態では、アンカーボルト３の立設位置を、杭５の内周面よりも内側に設定したが、これに代えて杭５の外周面よりも外側に設定してもかまわない。すなわち、アンカーボルト３が挿通されるボルト孔１３を、杭５の断面中心からの距離、換言すればアンカーボルト３の取付け半径Ｒが杭５の外径の半径ｒ2よりも大きくなるように位置決めする。 Moreover, in this embodiment, although the standing position of the anchor bolt 3 was set inside the inner peripheral surface of the pile 5, it may be set outside the outer peripheral surface of the pile 5 instead. That is, the bolt hole 13 through which the anchor bolt 3 is inserted is positioned so that the distance from the center of the cross section of the pile 5, in other words, the mounting radius R of the anchor bolt 3 is larger than the radius r 2 of the outer diameter of the pile 5. To do.

図４は、このようにボルト孔１３が位置決めされた固定度低減用平板４２がどのように面外曲げ変形を生じるかを示した図である。同図でわかるように変形例であっても、杭頭６における回転剛性は、固定度低減用平板４２の面外曲げ剛性として評価することが可能であり、上述の実施形態と同様、固定度低減用平板４２に関する諸データだけで杭頭６の回転剛性を算出し、杭頭６における固定度低減の程度を容易に把握することができる。   FIG. 4 is a diagram showing how the fixing degree reducing flat plate 42 with the bolt holes 13 positioned in this way undergoes out-of-plane bending deformation. As can be seen from the figure, even in the modified example, the rotational rigidity of the pile head 6 can be evaluated as the out-of-plane bending rigidity of the flatness 42 for fixing degree reduction. The rotational rigidity of the pile head 6 can be calculated only with various data relating to the reduction flat plate 42, and the degree of reduction of the fixing degree in the pile head 6 can be easily grasped.

また、本実施形態では特に言及しなかったが、固定度低減用平板２は一枚板である必要はなく、例えば図５及び図６に示すように、全体が円環状でそれぞれが扇状をなす４枚の分割片５３で固定度低減用平板５２を構成するとともに、各分割片５３のそれぞれにアンカーボルト３を立設するようにしてもかまわない。   Further, although not particularly mentioned in the present embodiment, the fixing degree reducing flat plate 2 does not have to be a single plate. For example, as shown in FIGS. 5 and 6, the whole is circular and each has a fan shape. The fixing degree reducing flat plate 52 may be constituted by the four divided pieces 53, and the anchor bolts 3 may be erected on each of the divided pieces 53.

かかる構成においても、上述した実施形態と同様の作用効果を奏するほか、各分割片５３が個別に面外曲げ変形を生じるため、全体の面外曲げ変形を把握しやすくなり、杭頭６における接合度の低減評価がさらに容易になる。   Even in such a configuration, in addition to the same effects as the above-described embodiment, each split piece 53 individually generates out-of-plane bending deformation, so that it becomes easy to grasp the entire out-of-plane bending deformation, and the joining at the pile head 6 The degree reduction evaluation becomes easier.

また、本実施形態では特に言及しなかったが、例えば図７に示すように、円環状に形成され内側縁部から半径方向外側に向かって延びるスリット７３を９０゜ごとに４カ所形成して固定度低減用平板７２を構成し、該スリットで挟まれた４つの舌状体７４にアンカーボルト３をそれぞれ立設するようにしてもかまわない。   Although not particularly mentioned in the present embodiment, for example, as shown in FIG. 7, four slits 73 formed in an annular shape and extending radially outward from the inner edge are formed at 90 ° positions and fixed. The degree reducing flat plate 72 may be configured, and the anchor bolts 3 may be erected on the four tongues 74 sandwiched between the slits.

かかる構成においても、上述した実施形態と同様の作用効果を奏するほか、各舌状体７４が個別に面外曲げ変形を生じるため、全体の面外曲げ変形を把握しやすくなり、杭頭６における接合度の低減評価が容易になる。   Even in such a configuration, the same effects as the above-described embodiment can be obtained, and each tongue-like body 74 individually generates out-of-plane bending deformation, so that it becomes easy to grasp the entire out-of-plane bending deformation, and in the pile head 6 The reduction evaluation of the degree of joining becomes easy.

同様に図８に示すように、それぞれを矩形部の短手縁部に半円部を延設して形成した４つの舌片８３で固定度低減用平板８２を構成するとともにこれら４つの舌片８３を９０゜ごとに端板７に重ねて接合し、該各舌片の半円部にアンカーボルト３をそれぞれ立設するようにしてもかまわない。   Similarly, as shown in FIG. 8, a fixing degree reducing flat plate 82 is constituted by four tongue pieces 83 each formed by extending a semicircular portion to a short edge portion of a rectangular portion, and these four tongue pieces. 83 may be overlapped and joined to the end plate 7 every 90 °, and the anchor bolts 3 may be erected on the semicircular portions of the respective tongue pieces.

かかる構成においても、上述した実施形態と同様の作用効果を奏するほか、各舌片８３が個別に面外曲げ変形を生じるため、全体の面外曲げ変形を把握しやすくなり、杭頭６における接合度の低減評価が容易になる。   Even in such a configuration, the same effects as the above-described embodiment can be obtained, and each tongue piece 83 individually generates out-of-plane bending deformation, so that it becomes easy to grasp the entire out-of-plane bending deformation, and the joining at the pile head 6 The degree reduction evaluation becomes easy.

本実施形態に係る接合材の分解斜視図。The disassembled perspective view of the joining material which concerns on this embodiment. 本実施形態に係る杭頭接合構造の図であり、(a)は平面図、(b)はＡ−Ａ線に沿う鉛直断面図。It is a figure of the pile head junction structure concerning this embodiment, (a) is a top view and (b) is a vertical sectional view which meets an AA line. 本実施形態に係る杭頭接合構造４及びそれに用いる接合材１の作用を示した図。The figure which showed the effect | action of the pile head junction structure 4 which concerns on this embodiment, and the joining material 1 used for it. 変形例に係る杭頭接合構造の作用を示した図。The figure which showed the effect | action of the pile head junction structure which concerns on a modification. 変形例に係る接合材の分解斜視図。The disassembled perspective view of the joining material which concerns on a modification. 変形例に係る杭頭接合構造の図であり、(a)は平面図、(b)はＢ−Ｂ線に沿う鉛直断面図。It is a figure of the pile head junction structure concerning a modification, (a) is a top view, (b) is a vertical sectional view which meets a BB line. 変形例に係る杭頭接合構造の図であり、(a)は平面図、(b)はＣ−Ｃ線に沿う鉛直断面図。It is a figure of the pile head junction structure concerning a modification, (a) is a top view, (b) is a vertical sectional view which meets a CC line. 変形例に係る杭頭接合構造の図であり、(a)は平面図、(b)はＤ−Ｄ線に沿う鉛直断面図。It is a figure of the pile head junction structure concerning a modification, (a) is a top view, (b) is a perpendicular sectional view which meets a DD line.

符号の説明Explanation of symbols

１ 接合材
２，４２，５２，７２，８２ 固定度低減用平板
３ アンカーボルト
５ 杭
６ 杭頭
７ 端板
８ 上部構造物
９ 基礎梁（基礎部材）
５３ 分割片
７３ スリット
７４ 舌状体
８３ 舌片
DESCRIPTION OF SYMBOLS 1 Joining material 2,42,52,72,82 Flatness reduction plate 3 Anchor bolt 5 Pile 6 Pile head 7 End plate 8 Superstructure 9 Foundation beam (base member)
53 Divided piece 73 Slit 74 Tongue 83 Tongue piece

Claims (7)

杭の頭部に設けられた端板に接合される固定度低減用平板と、該固定度低減用平板に立設され前記杭で支持される上部構造物の基礎部材に埋設されるアンカーボルトとを備え、地震時水平力が前記上部構造物から前記杭の頭部に作用したとき、前記固定度低減用平板が面外に曲げ変形して前記杭の頭部が回転するように構成した接合材であって、
前記固定度低減用平板を円環状に形成するとともに内側縁部から半径方向外側に向かって延びるスリットを複数形成して構成し、該スリットで挟まれた舌状体に前記アンカーボルトを立設したことを特徴とする接合材。 A fixing degree reducing flat plate joined to an end plate provided at the head of the pile, and an anchor bolt embedded in a foundation member of an upper structure that is erected on the fixing degree reducing flat plate and supported by the pile A joint configured such that when a horizontal force during an earthquake acts on the head of the pile from the superstructure, the flatness-reducing plate is bent and deformed out of plane and the head of the pile rotates. Material,
The fixing degree reducing flat plate is formed in an annular shape, and a plurality of slits extending radially outward from the inner edge are formed, and the anchor bolt is erected on a tongue-like body sandwiched between the slits. A bonding material characterized by that. 前記杭の断面中心から前記杭の中空内面までの距離をｒ 1 としたとき、前記杭の断面中心から前記アンカーボルトの材軸までの距離Ｒが、
Ｒ＜ｒ 1
となるように、前記アンカーボルトを前記固定度低減用平板に立設した請求項１記載の接合材。 When the distance from the cross-sectional center of the pile to the hollow inner surface of the pile and the r 1, the distance R from the center of the cross section of the said pile to a timber axis of the anchor bolt,
R <r 1
The joining material according to claim 1, wherein the anchor bolt is erected on the flatness for reducing the fixing degree. 杭の頭部に設けられた端板に剛接合される固定度低減用平板と、該固定度低減用平板に立設され前記杭で支持される上部構造物の基礎部材に埋設されるアンカーボルトとを備え、地震時水平力が前記上部構造物から前記杭の頭部に作用したとき、前記固定度低減用平板が面外に曲げ変形して前記杭の頭部が回転するように構成した接合材であって、
前記杭の断面中心から前記杭の中空内面までの距離をｒ1、前記杭の外面までの距離をｒ2としたとき、前記杭の断面中心から前記アンカーボルトの材軸までの距離Ｒが、
Ｒ＜ｒ1 又は ｒ2＜Ｒ
となるように、前記アンカーボルトを前記固定度低減用平板に立設するとともに、前記固定度低減用平板を、全体が円環状でそれぞれ扇状をなす複数の分割片で構成し該分割片のそれぞれに前記アンカーボルトを立設したことを特徴とする接合材。 A fixing degree reduction flat plate rigidly joined to an end plate provided at the head of the pile, and an anchor bolt embedded in a foundation member of an upper structure that is erected on the fixing degree reduction flat plate and supported by the pile. When the horizontal force at the time of earthquake acts on the head of the pile from the upper structure, the fixing degree reducing flat plate is bent out of plane and the head of the pile is rotated. A bonding material,
When r 1 a distance from the cross-sectional center of the pile to the hollow inner surface of the pile, the distance to the outer surface of the pile was r 2, the distance R from the center of the cross section of the said pile to a timber axis of the anchor bolt,
R <r 1 or r 2 <R
The anchor bolt is erected on the fixing degree reducing flat plate, and the fixing degree reducing flat plate is configured by a plurality of divided pieces each having an annular shape and a fan shape, and each of the divided pieces. The above-mentioned anchor bolt is erected on the joint material. 杭の頭部に設けられた端板に剛接合される固定度低減用平板と、該固定度低減用平板に立設され前記杭で支持される上部構造物の基礎部材に埋設されるアンカーボルトとを備え、地震時水平力が前記上部構造物から前記杭の頭部に作用したとき、前記固定度低減用平板が面外に曲げ変形して前記杭の頭部が回転するように構成した接合材であって、
前記杭の断面中心から前記杭の中空内面までの距離をｒ1、前記杭の外面までの距離をｒ2としたとき、前記杭の断面中心から前記アンカーボルトの材軸までの距離Ｒが、
Ｒ＜ｒ1 又は ｒ2＜Ｒ
となるように、前記アンカーボルトを前記固定度低減用平板に立設するとともに、前記固定度低減用平板を複数の舌片で構成し該各舌片に前記アンカーボルトを立設したことを特徴とする接合材。 A fixing degree reduction flat plate rigidly joined to an end plate provided at the head of the pile, and an anchor bolt embedded in a foundation member of an upper structure that is erected on the fixing degree reduction flat plate and supported by the pile. When the horizontal force at the time of earthquake acts on the head of the pile from the upper structure, the fixing degree reducing flat plate is bent out of plane and the head of the pile is rotated. A bonding material,
When r 1 a distance from the cross-sectional center of the pile to the hollow inner surface of the pile, the distance to the outer surface of the pile was r 2, the distance R from the center of the cross section of the said pile to a timber axis of the anchor bolt,
R <r 1 or r 2 <R
The anchor bolt is erected on the fixing degree reducing flat plate so that the fixing degree reducing flat plate is composed of a plurality of tongue pieces, and the anchor bolt is erected on each tongue piece. Joining material. 前記距離Ｒが、
Ｒ＜ｒ1
となるように、前記アンカーボルトを前記固定度低減用平板に立設した請求項３又は請求項４記載の接合材。 The distance R is
R <r 1
The joining material according to claim 3 or 4, wherein the anchor bolt is erected on the fixing degree reducing flat plate so that 前記杭の頭部を前記基礎部材に埋設した請求項５記載の接合材。 The bonding material according to claim 5, wherein a head portion of the pile is embedded in the foundation member. 請求項１乃至請求項６のいずれか一記載の接合材の固定度低減用平板を前記杭の頭部に設けられた端板に接合するとともに該接合材を構成するアンカーボルトが前記杭で支持される上部構造物の基礎部材に埋設されるようにしたことを特徴とする杭頭接合構造。 The flat plate for reducing the degree of fixation of the joining material according to any one of claims 1 to 6 is joined to an end plate provided on a head portion of the pile, and an anchor bolt constituting the joining material is supported by the pile. Pile head joint structure characterized by being embedded in the foundation member of the superstructure to be made.
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