JP5052396B2 - Pile head joint structure and temporary tool for pile head joint used in its construction - Google Patents

Pile head joint structure and temporary tool for pile head joint used in its construction Download PDF

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JP5052396B2
JP5052396B2 JP2008112785A JP2008112785A JP5052396B2 JP 5052396 B2 JP5052396 B2 JP 5052396B2 JP 2008112785 A JP2008112785 A JP 2008112785A JP 2008112785 A JP2008112785 A JP 2008112785A JP 5052396 B2 JP5052396 B2 JP 5052396B2
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JP2009263926A (en
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治克 角屋
亨 渡辺
信博 荒木
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岡部株式会社
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本発明は、地盤に埋設された杭と該杭が支持する上部構造物との接合箇所における杭頭接合構造及びその構築に用いる杭頭接合用仮設具に関する。   The present invention relates to a pile head joint structure at a joint portion between a pile embedded in the ground and an upper structure supported by the pile, and a temporary tool for pile head joint used for the construction thereof.

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 support layer.

これらの杭の頭部は、上部構造物の基礎スラブ、フーチングあるいは基礎梁といった基礎部材に埋め込まれ、該基礎部材を介して長期荷重である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や、水平力に起因する曲げモーメントが作用する。   The heads of these piles are embedded in foundation members such as foundation slabs, footings or foundation beams of the upper structure, and a compressive force acting as a long-term load acts on the foundation members. Pulling force due to the overturning moment and bending moment due to the horizontal force act.

そのため、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。   Therefore, when the superstructure encounters an extremely large earthquake, an excessive bending moment acts on the pile head, which may lead to an unexpected situation such as the destruction of the pile and the collapse of the superstructure.

そこで、最近では、例えば杭頭の端板に立設されたアンカー鉄筋にアンボンド処理を施すことによって、杭頭接合部の固定度を小さくする、いわば半剛接合工法の研究開発が行われるようになってきた。   Therefore, recently, for example, the R & D of the semi-rigid joint method has been carried out to reduce the degree of fixation of the pile head joint by unbonding the anchor reinforcing bars standing on the end plate of the pile head. It has become.

特許第3438108号公報Japanese Patent No. 3438108 特開2002−356861号公報Japanese Patent Laid-Open No. 2002-356861 特許第3825795号公報Japanese Patent No. 3825795 特開2004−44303公報JP 2004-44303 A 特開2006−193904公報JP 2006-193904 A

かかる半剛接合工法によれば、杭頭接合部の固定度が小さくなるため、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。   According to such a semi-rigid joining method, since the fixing degree of the pile head joint portion is reduced, the bending moment generated at the pile head can be reduced.

しかしながら、従来の半剛接合工法においては、基礎部材への固定度が杭頭に作用する軸力によって変化し、それに伴って、杭頭に発生する曲げモーメントも変化する。   However, in the conventional semi-rigid joining method, the degree of fixation to the foundation member changes depending on the axial force acting on the pile head, and accordingly, the bending moment generated on the pile head also changes.

一方、杭頭に作用する軸力は、杭ごとに異なるのが通常である。   On the other hand, the axial force acting on the pile head is usually different for each pile.

そのため、半剛接合工法で杭頭接合部の固定度を小さくすることができたとしても、その低減の程度は杭ごとに異なることになり、結果として非常に複雑かつ煩雑な設計作業を強いられるという問題を生じていた。   Therefore, even if the fixing degree of the pile head joint can be reduced by the semi-rigid joining method, the degree of reduction will be different for each pile, resulting in a very complicated and complicated design work. It was causing the problem.

本発明は、上述した事情を考慮してなされたもので、基礎部材への固定度が軸力に依存しないようにすることが可能な杭頭接合構造及びその構築に用いる杭頭接合用仮設具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 a pile head joint structure capable of preventing the degree of fixing to the foundation member from depending on the axial force and a pile head joint temporary tool used for the construction thereof. The purpose is to provide.

上記目的を達成するため、本発明に係る杭頭接合構造は請求項1に記載したように、杭の頭部を上部構造物の基礎部材に埋め込んでなる杭頭接合構造において、
前記杭の頭部に設けられた端板に杭頭接合用ロッドを立設して前記基礎部材に埋設し、前記杭の頭部が埋め込まれた前記基礎部材の埋込み凹部の内面のうち、凹部天井面を、前記上部構造物からの鉛直荷重が前記杭頭接合用ロッドのみを介して前記杭に伝達されるように前記端板の上面から離間させたものである。
In order to achieve the above object, the pile head joint structure according to the present invention is the pile head joint structure according to claim 1, wherein the pile head is embedded in the foundation member of the upper structure.
Of the inner surface of the embedding recessed portion of the foundation member in which the pile head connecting rod is erected on the end plate provided on the head of the pile and embedded in the foundation member, The ceiling surface is separated from the upper surface of the end plate so that a vertical load from the upper structure is transmitted to the pile only through the pile head joining rod .

また、本発明に係る杭頭接合構造は、前記杭頭接合用ロッドを、前記端板に立設されたロッド部材と該ロッド部材の所定位置に取り付けられた定着板とで構成したものである。   Moreover, the pile head joining structure which concerns on this invention comprises the said rod for pile head joining by the rod member standingly arranged by the said end plate, and the fixing board attached to the predetermined position of this rod member. .

また、本発明に係る杭頭接合構造は、前記ロッド部材が挿通されるシース管を前記杭頭接合用ロッドに備えたものである。   Moreover, the pile head joining structure which concerns on this invention equips the rod for pile head joining with the sheath pipe | tube through which the said rod member is penetrated.

また、本発明に係る杭頭接合用仮設具は請求項4に記載したように、杭の頭部に設けられる端板に立設された杭頭接合用ロッドを前記杭の頭部が埋め込まれる上部構造物の基礎部材に埋設してなる杭頭接合構造に用いる杭頭接合用仮設具であって、前記杭頭接合用ロッドが挿通される挿通孔が形成された円形天板及び該円形天板の周縁に垂設された円筒体からなる被冠部材を備えるとともに、該被冠部材を、前記円形天板に形成された前記挿通孔に前記杭頭接合用ロッドが挿通された状態で前記杭の頭部に被せることができるように構成してなり、前記被冠部材は、前記基礎部材の形成時にフレッシュコンクリートを打設する際、前記円形天板と前記端板との離間状態が保持されるようにかつ前記円形天板と前記杭の頭部との間にフレッシュコンクリートが流入しないように構成してあるとともに、フレッシュコンクリート硬化後は、前記上部構造物からの鉛直荷重が前記杭頭接合用ロッドのみを介して前記杭に伝達されるようにすることで前記基礎部材が前記杭の頭部に回転拘束を及ぼさないように構成したものである。 Moreover, the temporary tool for pile head joining which concerns on this invention is as described in Claim 4, and the head of the said pile is embedded in the rod for pile head joining standingly installed in the end plate provided in the head of a pile. A pile head joining temporary tool for use in a pile head joint structure embedded in a foundation member of an upper structure, wherein the circular top plate is formed with an insertion hole through which the pile head joint rod is inserted, and the circular ceiling A crown member comprising a cylindrical body suspended from the periphery of the plate, and the crown member is inserted into the insertion hole formed in the circular top plate with the pile head joining rod inserted therethrough. The crown member is configured so that it can be put on the head of the pile, and the crown member is kept in a separated state between the circular top plate and the end plate when placing the fresh concrete when forming the foundation member. And fresh between the circular top plate and the head of the pile Nkurito together is configured so as not to flow into the foundation by so after the fresh concrete curing, vertical load from the superstructure is transferred to the pile via only rod for the pile joint It is comprised so that a member may not exert rotation restrictions on the head of the said pile.

また、本発明に係る杭頭接合用仮設具は、前記円形天板と前記杭の頭部との間に充填又は配置されるコンクリート流入防止材を備えたものである。   Moreover, the temporary installation tool for pile head joining which concerns on this invention is equipped with the concrete inflow prevention material with which it fills or arrange | positions between the said circular top plate and the head of the said pile.

また、本発明に係る杭頭接合用仮設具は請求項6に記載したように、杭の頭部に設けられる端板に立設された杭頭接合用ロッドを前記杭の頭部が埋め込まれる上部構造物の基礎部材に埋設してなる杭頭接合構造に用いる杭頭接合用仮設具であって、前記杭頭接合用ロッドが挿通される挿通孔が形成された円形天板及び該円形天板の周縁に垂設された円筒体からなる被冠部材を備えるとともに、該被冠部材を、前記円形天板に形成された前記挿通孔に前記杭頭接合用ロッドが挿通された状態で前記杭の頭部に被せることができるように構成してなり、前記被冠部材は、前記基礎部材の形成時にフレッシュコンクリートを打設する際、前記円形天板と前記端板との離間状態が保持されるようにかつ前記円形天板と前記杭の頭部との間にフレッシュコンクリートが流入しないように構成してあるとともに、フレッシュコンクリート硬化後は、前記基礎部材が前記杭の頭部に回転拘束を及ぼさないように構成してあり、前記円形天板と前記杭の頭部との間に介装されそれらの離間状態を保持するスペーサを備えたものである。   Moreover, the temporary tool for pile head joining which concerns on this invention is as described in Claim 6, The head of the said pile is embedded with the rod for pile head joining standingly installed in the end plate provided in the head of a pile. A pile head joining temporary tool for use in a pile head joint structure embedded in a foundation member of an upper structure, wherein the circular top plate is formed with an insertion hole through which the pile head joint rod is inserted, and the circular ceiling A crown member comprising a cylindrical body suspended from the periphery of the plate, and the crown member is inserted into the insertion hole formed in the circular top plate with the pile head joining rod inserted therethrough. The crown member is configured so that it can be put on the head of the pile, and the crown member is kept in a separated state between the circular top plate and the end plate when placing the fresh concrete when forming the foundation member. And fresh between the circular top plate and the head of the pile In addition, the foundation member is configured not to exert rotational restraint on the head of the pile after hardening of the fresh concrete, and the circular top plate and the head of the pile. Are provided with spacers that are interposed between the two and holding the separated state.

基礎スラブ、基礎梁、フーチングといった基礎部材への杭の固定度は、剛接に近いほど杭頭の回転剛性が大きくなり、地震時において発生する曲げモーメントも増加する。   As the piles are fixed to the foundation members such as foundation slabs, foundation beams, and footings, the closer to the rigid connection, the greater the rotational rigidity of the pile head and the greater the bending moment generated during an earthquake.

かかる状況下、従来技術で述べたように、固定度を落とす半剛接合工法が数多く検討されてきたが、それらのほとんどは、軸力によって固定度が変化する。すなわち、軸力が大きいと、杭頭接合部の回転剛性が大きくなって発生曲げモーメントは大きくなり、軸力が小さいと、杭頭接合部の回転剛性が小さくなって発生曲げモーメントも小さくなる。   Under such circumstances, as described in the prior art, many semi-rigid joining methods for reducing the fixing degree have been studied, but most of them change the fixing degree depending on the axial force. That is, when the axial force is large, the rotational rigidity of the pile head joint is increased and the generated bending moment is increased. When the axial force is small, the rotational rigidity of the pile head bonded portion is decreased and the generated bending moment is also decreased.

つまり、各杭に作用する軸力は一般的には杭ごとに異なり、それに伴って回転剛性も杭ごとに異なるため、半剛接合工法によって曲げモーメントの大きさを全般的に小さくすることはできても、その大きさは杭ごとに異なる。   In other words, the axial force acting on each pile generally varies from pile to pile, and the rotational stiffness also varies from pile to pile.Accordingly, the magnitude of the bending moment cannot be reduced generally by the semi-rigid joint method. However, the size varies from pile to pile.

本出願人は、かかる状況に鑑み、半剛接合にしても回転剛性が軸力に依存しないようにするにはどうすればよいか研究開発を行った結果、杭頭に生じる曲げモーメントを、杭頭の端板に立設されたアンカー鉄筋の引張力と鉄筋コンクリートである基礎部材の圧縮力で支持するというそれまでの設計思想を捨て去り、圧縮力についてもアンカー鉄筋で支持する新規な設計思想を導入することにより、杭頭部における回転剛性を軸力に依存させないようにすることに成功したものである。   In view of this situation, the present applicant conducted research and development on how to make the rotational rigidity independent of axial force even in semi-rigid joints. Abandoning the previous design philosophy of supporting with the tensile force of anchor reinforcing bars erected on the end plate and the compressive force of foundation members made of reinforced concrete, and introducing a new design philosophy that supports compressive force with anchor reinforcing bars. Thus, the rotation rigidity at the pile head is not made dependent on the axial force.

すなわち、従来の杭頭接合構造では、基礎部材に埋め込まれた状態において、杭頭の上面と基礎部材との間に隙間は形成されないが、本発明に係る杭頭接合構造においては、杭の頭部が埋め込まれる基礎部材の埋込み凹部の内面のうち、凹部天井面を、上部構造物からの鉛直荷重が杭頭接合用ロッドのみを介して杭に伝達されるように端板の上面から離間させる構成であり、結果として、杭頭の上面と基礎部材との間に中空空間が形成される。 That is, in the conventional pile head joint structure, no gap is formed between the upper surface of the pile head and the foundation member in a state embedded in the foundation member, but in the pile head joint structure according to the present invention, the pile head Of the inner surface of the embedded concave portion of the foundation member in which the portion is embedded, the concave ceiling surface is separated from the upper surface of the end plate so that the vertical load from the upper structure is transmitted only to the pile head connecting rod . As a result, a hollow space is formed between the upper surface of the pile head and the foundation member.

このようにすると、地震時水平力が上部構造物から杭の頭部に作用しても、杭の頭部は、基礎部材から回転拘束を受けなくなるとともに、杭頭で発生する曲げモーメントは、圧縮側も引張側も杭頭接合用ロッドが負担することになる。 In this way, even if the horizontal force during the earthquake acts on the pile head from the superstructure, the pile head is not subject to rotational restraint from the foundation member, and the bending moment generated at the pile head is compressed. The pile head joint rod bears both the side and the tension side.

換言すれば、杭の頭部は、杭頭接合用ロッドを介した圧縮力及び引張力で回転拘束を受けるが、基礎部材との間の圧縮力伝達による回転拘束は受けないため、本願発明における杭頭の回転拘束は、軸力に依存しない回転拘束となる。   In other words, the head of the pile is subjected to rotational restraint due to compressive force and tensile force via the pile head joining rod, but is not subject to rotational restraint due to compressive force transmission with the base member. The rotation constraint of the pile head is a rotation constraint that does not depend on the axial force.

そのため、杭頭の回転剛性、すなわち杭頭における回転変形角と杭頭に生じる曲げモーメントとの関係は軸力に依存しなくなり、設計プロセスを簡略化することが可能となる。   Therefore, the rotational rigidity of the pile head, that is, the relationship between the rotational deformation angle at the pile head and the bending moment generated at the pile head does not depend on the axial force, and the design process can be simplified.

杭の頭部は、基礎スラブ、基礎梁、フーチングといった基礎部材に所定深さだけ埋め込まれるが、本発明においては、基礎部材に形成された埋込み凹部の凹部天井面を端板から離間配置するため、杭頭の埋込み深さと埋込み凹部の深さは、離間距離の分だけ異なる。   The head of the pile is embedded in a foundation member such as a foundation slab, foundation beam, or footing by a predetermined depth, but in the present invention, the recessed ceiling surface of the embedding recess formed in the foundation member is disposed away from the end plate. The embedding depth of the pile head and the embedding recess are different by the distance.

なお、杭頭の埋込み深さは、上部構造物の基礎部材と杭頭との間でせん断力が伝達される一方、曲げモーメントについては、杭頭接合用ロッドが負担する曲げモーメントよりも十分小さくなるよう、あるいは実質的に伝達されないように適宜設定する。   The pile head embedding depth is such that shear force is transmitted between the foundation member of the superstructure and the pile head, while the bending moment is sufficiently smaller than the bending moment borne by the pile head connecting rod. It sets suitably so that it may become or it may not be transmitted substantially.

基礎部材と端板との圧縮力伝達による回転拘束が生じない限り、凹部天井面を端板の上面から離間させるためにどのような手段を採用するかは任意であり、例えば杭頭接合構造を構築する際、杭の頭部に被せることが可能な被冠部材を備えた杭頭接合用仮設具を用いることが可能である。   As long as rotation restraint due to transmission of compressive force between the base member and the end plate does not occur, what means is adopted to separate the recessed ceiling surface from the upper surface of the end plate is arbitrary. When constructing, it is possible to use a pile head joining temporary tool provided with a crowned member that can be put on the head of the pile.

被冠部材は、杭頭接合用ロッドが挿通される挿通孔が形成された円形天板及び該円形天板の周縁に垂設された円筒体からなり、円形天板に形成された挿通孔に杭頭接合用ロッドが挿通された状態で杭の頭部に被せることができるように構成してある。なお、円形天板と円筒体とを一体成形するか、それとも別体で形成して両者を適宜接合するかは任意であり、接合の仕方も、仮設部材ゆえ、必ずしも溶着等で接合する必要はなく、例えば耐水性テープや接着剤で足りる場合も考えられる。   The crowned member is composed of a circular top plate formed with an insertion hole through which the pile head joining rod is inserted, and a cylindrical body suspended from the periphery of the circular top plate, and is inserted into the insertion hole formed in the circular top plate. It is comprised so that it can cover the head of a pile in the state by which the rod for pile head joining was penetrated. It is optional to form the circular top plate and the cylindrical body integrally, or to form them separately and to join them appropriately. The joining method is also a temporary member, so it is not always necessary to join them by welding or the like. In some cases, for example, a water-resistant tape or an adhesive is sufficient.

加えて、被冠部材は、基礎部材の形成時にフレッシュコンクリートを打設する際、円形天板と端板との離間状態が保持されるようにかつ円形天板と杭の頭部との間にフレッシュコンクリートが流入しないように構成してあるとともに、フレッシュコンクリート硬化後は、上部構造物からの鉛直荷重が杭頭接合用ロッドのみを介して杭に伝達されるようにすることで基礎部材が杭の頭部に回転拘束を及ぼさないように構成してある。 In addition, the crown member is placed between the circular top plate and the head of the pile so that the state of separation between the circular top plate and the end plate is maintained when fresh concrete is placed when the foundation member is formed. It is configured so that fresh concrete does not flow in. After the fresh concrete is hardened , the foundation member is piled by allowing the vertical load from the superstructure to be transmitted to the pile only through the pile head joining rod. The head is not restricted rotationally.

かかる被冠部材を備えた杭頭接合用仮設具によれば、被冠部材は、円形天板と杭頭の端板との間にフレッシュコンクリートを流入させないためのいわば型枠部材として作用する。なお、フレッシュコンクリート硬化後は、被冠部材が基礎部材に一体化し、被冠部材を構成する円筒体の内周面は、杭頭接合構造における埋込み凹部の内面のうち、凹部側面の一部又は全部となり、円形天板の下面は、凹部天井面となる。   According to the pile head joining temporary tool provided with such a crowned member, the crowned member functions as a so-called formwork member for preventing fresh concrete from flowing between the circular top plate and the end plate of the pile head. After the fresh concrete is hardened, the crown member is integrated with the foundation member, and the inner peripheral surface of the cylindrical body constituting the crown member is a part of the side surface of the recess among the inner surfaces of the embedded recesses in the pile head joint structure or The bottom surface of the circular top plate becomes the concave ceiling surface.

被冠部材を杭頭に被せるにあたっては、円筒体の内周面が杭頭の周面に重なるように被せてもよいし、円筒体の外周面と杭頭の周面とがほぼ面一となるように該円筒体の下端を杭頭の端板周縁に載せるように被せてもかまわない。   When covering the crown member on the pile head, it may be covered so that the inner peripheral surface of the cylindrical body overlaps the peripheral surface of the pile head, or the outer peripheral surface of the cylindrical body and the peripheral surface of the pile head are substantially flush. The lower end of the cylindrical body may be covered so as to be placed on the periphery of the end plate of the pile head.

円筒体を杭頭の周面に重ねるように被せる場合、例えば円筒体と杭頭とを接着剤で仮固定することで、円形天板と端板との離間状態を保持してもかまわないが、円形天板と杭の頭部との間にスペーサを介装するようにすれば、両者の離間状態を確実に保持することが可能となる。   When covering the cylindrical body so as to overlap the circumferential surface of the pile head, for example, the cylindrical body and the pile head may be temporarily fixed with an adhesive to maintain the separated state between the circular top plate and the end plate. If a spacer is interposed between the circular top plate and the head of the pile, it is possible to reliably maintain the separated state of both.

スペーサは、フレッシュコンクリート硬化後において基礎部材と杭の頭部との間に相対回転変形が作用したときに弾性変形若しくは塑性変形し、又は脆性破壊するように、その弾塑性特性を適宜設定しておく。   The spacer has its elasto-plastic characteristics set appropriately so that it undergoes elastic deformation or plastic deformation or brittle fracture when relative rotational deformation acts between the foundation member and the head of the pile after setting the fresh concrete. deep.

かかる構成によれば、基礎部材が杭の頭部に回転拘束を及ぼさないようにすることができる。   According to this configuration, the foundation member can be prevented from exerting rotational restraint on the head of the pile.

スペーサの形態は任意であり、例えば波板状スペーサ、又は杭頭接合用ロッドが挿通される管状スペーサとすることができる。   The form of the spacer is arbitrary, and for example, it can be a corrugated spacer or a tubular spacer through which a pile head joining rod is inserted.

一方、円筒体の外周面と杭頭の周面とがほぼ面一となるように該円筒体の下端を杭頭の端板周縁に載せる場合、被冠部材自体がフレッシュコンクリートの圧力を支持することで円形天板と端板との離間状態が確保されるが、フレッシュコンクリート硬化後においては、スペーサと同様、基礎部材と杭の頭部との相対回転変形によって弾性変形若しくは塑性変形し又は脆性破壊することによって、基礎部材が杭の頭部に回転拘束を及ぼさないように、被冠部材の弾塑性特性を適宜設定しておく。   On the other hand, when the lower end of the cylindrical body is placed on the periphery of the end plate of the pile head so that the outer peripheral surface of the cylindrical body and the peripheral surface of the pile head are substantially flush, the crowned member itself supports the pressure of fresh concrete In this way, the separation between the circular top plate and the end plate is ensured, but after hardening the fresh concrete, it is elastically deformed or plastically deformed or brittle due to the relative rotational deformation of the foundation member and the head of the pile, like the spacer. The elasto-plastic characteristics of the crowned member are set as appropriate so that the foundation member does not rotationally restrain the head of the pile by breaking.

円形天板と杭の頭部との間にフレッシュコンクリートが流入しないようにするには、例えば円筒体の下端縁部と杭頭周面とを跨ぐように耐水性テープを巻回してもよいが、円形天板と杭の頭部との間にコンクリート流入防止材を充填又は配置する構成とすることも可能である。   In order to prevent fresh concrete from flowing between the circular top plate and the head of the pile, for example, a water-resistant tape may be wound so as to straddle the lower end edge of the cylindrical body and the peripheral surface of the pile head. It is also possible to adopt a configuration in which a concrete inflow prevention material is filled or arranged between the circular top plate and the head of the pile.

コンクリート流入防止材は、フレッシュコンクリート硬化後、基礎部材が杭の頭部に回転拘束を及ぼさないように、弾性変形し、収縮し、又は脆性破壊する材料、例えばスポンジや、発泡スチロール、発泡ウレタンその他の発泡系材料で構成することができる。   The concrete inflow prevention material is a material that elastically deforms, shrinks or brittlely breaks so that the foundation member does not constrain the head of the pile after rotation of fresh concrete, such as sponge, foamed polystyrene, foamed urethane, etc. It can be made of a foam material.

コンクリート流入防止材を発泡系材料で構成した場合、円形天板と杭の端板との離間状態を保持するスペーサとしての役割も果たす。   When the concrete inflow preventing material is made of a foam material, it also serves as a spacer for maintaining the separated state between the circular top plate and the end plate of the pile.

杭頭接合用ロッドは、杭頭の曲げモーメントを圧縮力及び引張力で支持できる限り、どのように構成するかは任意であり、例えば、端板に立設されたアンカー鉄筋等のロッド部材と該ロッド部材の所定位置に取り付けられた定着板とで構成することができる。   The rod for connecting the pile head is arbitrary as long as the bending moment of the pile head can be supported by the compressive force and the tensile force, for example, a rod member such as an anchor reinforcing bar erected on the end plate It can be constituted by a fixing plate attached to a predetermined position of the rod member.

ここで、ロッド部材が挿通されるシース管を杭頭接合用ロッドに備えたならば、ロッド部材についてアンボンド処理を行うことが可能となり、杭頭の回転剛性を小さく設定することが可能となる。   Here, if the sheath tube through which the rod member is inserted is provided in the pile head joining rod, the rod member can be unbonded, and the rotational rigidity of the pile head can be set small.

以下、本発明に係る杭頭接合構造及びその構築に用いる杭頭接合用仮設具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。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pile head joint structure according to the present invention and a pile head joint temporary tool used for the construction 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は、本実施形態に係る杭頭接合構造及びその構築に用いる杭頭接合用仮設具を示した断面図、図2は、杭頭接合用仮設具を示した斜視図である。これらの図でわかるように、本実施形態に係る杭頭接合構造21は、杭2の頭部3(以下、杭頭3)を上部構造物5の基礎部材である基礎スラブ6に埋め込むとともに、杭頭3に設けられた端板4に杭頭接合用ロッドとしてのアンカー鉄筋7を立設して基礎スラブ6に埋設し、杭頭3が埋め込まれた基礎スラブ6の埋込み凹部の内面のうち、凹部天井面11を端板4の上面から離間させてなる。   FIG. 1 is a cross-sectional view showing a pile head joining structure according to this embodiment and a pile head joining temporary tool used for the construction, and FIG. 2 is a perspective view showing the pile head joining temporary tool. As can be seen from these drawings, the pile head joint structure 21 according to the present embodiment embeds the head 3 of the pile 2 (hereinafter, the pile head 3) in the foundation slab 6 that is the foundation member of the upper structure 5, Among the inner surfaces of the embedded recesses of the foundation slab 6 in which the anchor rebar 7 as a pile head joining rod is erected on the end plate 4 provided on the pile head 3 and embedded in the foundation slab 6 The concave ceiling surface 11 is separated from the upper surface of the end plate 4.

アンカー鉄筋7は、溶着、螺着といった公知の固着方法によって端板4に立設してある。   The anchor rebar 7 is erected on the end plate 4 by a known fixing method such as welding or screwing.

かかる杭頭接合構造21を構築するには、図1及び図2に示す杭頭接合用仮設具1を用いればよい。杭頭接合用仮設具1は、アンカー鉄筋7が挿通される挿通孔12が形成された円形天板8及び該円形天板の周縁に垂設された円筒体9からなる被冠部材10を備える。   In order to construct such a pile head joining structure 21, the pile head joining temporary tool 1 shown in FIGS. 1 and 2 may be used. The pile head joining temporary tool 1 includes a crowned member 10 including a circular top plate 8 formed with an insertion hole 12 through which an anchor reinforcing bar 7 is inserted, and a cylindrical body 9 suspended from the periphery of the circular top plate. .

挿通孔12は、円形天板8とアンカー鉄筋7とが非固着となるよう、かつ後述するフレッシュコンクリートが被冠部材10内に流入しないよう、その孔径を適宜定めておく。   The hole diameter of the insertion hole 12 is appropriately determined so that the circular top plate 8 and the anchor reinforcing bar 7 are not fixed, and fresh concrete described later does not flow into the crowned member 10.

被冠部材10は図1でよくわかるように、円形天板8に形成された挿通孔12にアンカー鉄筋7が挿通された状態で、円形天板8が端板4の上面からΔhだけ離間した状態で杭頭3に被せることができるようになっている。   As can be clearly seen in FIG. 1, the crown member 10 is separated from the upper surface of the end plate 4 by Δh in a state where the anchor reinforcing bars 7 are inserted into the insertion holes 12 formed in the circular top plate 8. It can be put on the pile head 3 in a state.

ここで、被冠部材10は、
i) 基礎スラブ6を形成するためのフレッシュコンクリートを打設する際、円形天板8と端板4との離間状態が保持されるように、
ii) 円形天板8と杭頭3との間にフレッシュコンクリートが流入しないように、
iii) フレッシュコンクリートが硬化した後は、基礎スラブ6が杭頭3に回転拘束を及ぼさないようにするように、
適宜構成する。
Here, the crown member 10 is
i) When placing fresh concrete for forming the foundation slab 6, so that the separated state between the circular top plate 8 and the end plate 4 is maintained.
ii) To prevent fresh concrete from flowing between the circular top plate 8 and the pile head 3,
iii) After the fresh concrete has hardened, make sure that the foundation slab 6 does not impose rotational restraints on the pile head 3.
Configure as appropriate.

かかる要件を満たすためには、例えば、被冠部材10を構成する円筒体9の内径を杭2の外径に一致させるとともに、該円筒体の内周面を杭頭3の周面に重ねて接着剤で両者を仮止めすればよい。   In order to satisfy such requirements, for example, the inner diameter of the cylindrical body 9 constituting the crowned member 10 is matched with the outer diameter of the pile 2, and the inner peripheral surface of the cylindrical body is overlapped with the peripheral surface of the pile head 3. What is necessary is just to temporarily fix both with an adhesive agent.

接着剤の種類や塗布厚は、フレッシュコンクリートを打設する際にはその圧力を支持することで円形天板8と端板4との離間状態を保持するとともに、フレッシュコンクリートが硬化した後は、地震動その他の相対強制変形によって接着が切れるように適宜定めればよい。   The type and application thickness of the adhesive are such that when the fresh concrete is placed, the pressure is supported to maintain the separation between the circular top plate 8 and the end plate 4, and after the fresh concrete is cured, What is necessary is just to determine suitably so that adhesion | attachment may be cut | disconnected by seismic motion and other relative forced deformation.

杭頭接合用仮設具1を用いて杭頭接合構造21を構築するには、端板4に立設されたアンカー鉄筋7が円形天板8に挿通されるようにかつ円形天板8の下面が端板4の上面からΔhだけ離間するように被冠部材10を杭頭3に被せ、かかる状態で被冠部材10の周囲にフレッシュコンクリートを打設することで、杭頭3の周囲に基礎スラブ6を形成するとともに、該基礎スラブにアンカー鉄筋7を埋設する。   In order to construct the pile head joining structure 21 using the temporary tool 1 for pile head joining, the anchor rebar 7 erected on the end plate 4 is inserted into the circular top plate 8 and the bottom surface of the circular top plate 8 The crown member 10 is placed on the pile head 3 so as to be separated from the upper surface of the end plate 4 by Δh, and fresh concrete is placed around the crown member 10 in this state, so that the foundation around the pile head 3 is provided. While forming the slab 6, the anchor reinforcement 7 is embed | buried in this foundation | substrate slab.

なお、被冠部材10の周囲に打設されたフレッシュコンクリートが硬化した後は、結果として、基礎スラブ6に埋込み凹部が形成され、該埋込み凹部に杭頭3が深さDだけ埋め込まれることになるとともに、被冠部材10は、基礎スラブ6に一体化し、円筒体9の内周面は、埋込み凹部の内面のうち、凹部側面の一部となり、円形天板8の下面は、凹部天井面11となって端板4の上面からΔhだけ離間配置される。   In addition, after the fresh concrete placed around the crown member 10 is hardened, as a result, an embedded recess is formed in the foundation slab 6, and the pile head 3 is embedded in the embedded recess by a depth D. At the same time, the crowned member 10 is integrated with the basic slab 6, the inner peripheral surface of the cylindrical body 9 is a part of the side surface of the concave portion of the inner surface of the embedded concave portion, and the lower surface of the circular top plate 8 is the concave ceiling surface. 11 and spaced from the upper surface of the end plate 4 by Δh.

ちなみに、埋込み凹部の深さは図1に示すようにD′であり、埋込み深さDは、Δhだけ埋込み凹部の深さD′よりも浅くなる。埋込み深さDは、基礎スラブ6と杭2とのせん断力伝達との関係で適宜設定すればよい。   Incidentally, the depth of the embedded recess is D ′ as shown in FIG. 1, and the embedded depth D is shallower than the depth D ′ of the embedded recess by Δh. What is necessary is just to set the embedding depth D suitably by the relationship with the shearing force transmission of the foundation slab 6 and the pile 2. FIG.

Δhは、設計地震動による杭頭3の回転量を想定し、該回転量でも円形天板8と杭頭3とが接触しないように、かつアンカー鉄筋7が円形天板8と杭頭3との間で座屈しないように適宜定める。   Δh assumes the amount of rotation of the pile head 3 due to the design seismic motion, the circular top plate 8 and the pile head 3 are not in contact with each other, and the anchor rebar 7 is Set appropriately so as not to buckle between.

本実施形態に係る杭頭接合構造21及びそれを用いる杭頭接合用仮設具1においては、杭頭3が埋め込まれる基礎スラブ6の埋込み凹部の内面のうち、凹部天井面となる円形天板8の下面11が端板4の上面から離間配置される。   In the pile head joining structure 21 and the pile head joining temporary tool 1 using the same according to the present embodiment, the circular top plate 8 serving as a recessed ceiling surface among the inner surfaces of the recessed recessed portions of the foundation slab 6 in which the pile heads 3 are embedded. The lower surface 11 is spaced from the upper surface of the end plate 4.

このようにすると図3に示すように、地震時水平力が上部構造物5から杭頭3に作用したとき、基礎スラブ6に形成された埋込み凹部の凹部天井面である円形天板8の下面11と杭頭3とが非接触状態であるため、杭頭3は、基礎スラブ6から回転拘束を受けなくなるとともに、杭頭3で発生する曲げモーメントMは、圧縮側も引張側もアンカー鉄筋7が負担することになる。   In this way, as shown in FIG. 3, when a horizontal force during an earthquake acts on the pile head 3 from the upper structure 5, the bottom surface of the circular top plate 8 that is the recessed ceiling surface of the embedded recess formed in the foundation slab 6. 11 and the pile head 3 are in a non-contact state, the pile head 3 is not subjected to rotational restraint from the foundation slab 6, and the bending moment M generated in the pile head 3 is an anchor rebar 7 on both the compression side and the tension side. Will bear.

すなわち、圧縮側のアンカー鉄筋7には圧縮力Cが発生するとともに、引張側のアンカー鉄筋7には引張力Tが発生し、これらの力が曲げモーメントMと釣り合う。なお、図3に示した曲げモーメントは杭頭に発生しているモーメントであるため、釣り合いを考える場合の端板4に作用する曲げモーメントとは方向が逆となる。   That is, a compressive force C is generated in the compression-side anchor reinforcing bar 7, and a tensile force T is generated in the tensile-side anchor reinforcing bar 7, and these forces are balanced with the bending moment M. Since the bending moment shown in FIG. 3 is a moment generated at the pile head, the direction is opposite to the bending moment acting on the end plate 4 when considering the balance.

上述したように、円形天板8の下面11と杭頭3とが非接触状態となって基礎スラブ6からの杭頭3への回転拘束がなくなるため、杭頭3で発生する曲げモーメントMは、圧縮側も引張側もアンカー鉄筋7が負担することになる。換言すれば、杭頭3は、アンカー鉄筋7を介した圧縮力C及び引張力Tで回転拘束を受けるが、基礎スラブ6との間の圧縮力伝達による回転拘束は受けないため、杭頭3の回転拘束は、軸力に依存しない回転拘束となる。   As described above, since the lower surface 11 of the circular top plate 8 and the pile head 3 are in a non-contact state and the rotation restraint from the foundation slab 6 to the pile head 3 is eliminated, the bending moment M generated at the pile head 3 is The anchor rebar 7 bears both the compression side and the tension side. In other words, the pile head 3 is rotationally restrained by the compressive force C and the tensile force T via the anchor rebar 7, but is not subject to rotational restraint due to compressive force transmission with the foundation slab 6. This rotation constraint is a rotation constraint that does not depend on the axial force.

図4は、杭頭3における弾性範囲内での変形状態を示した模式図である。まず、軸力が比較的大きい場合((a))、その軸力で生じる圧縮ひずみをδ1、曲げモーメントMによる圧縮側のひずみをδc、曲げモーメントMによる引張側のひずみをδtとすると、回転角R1は、
1={(δc+δ1)+(δt−δ1)}/(2・r)
=(δc+δt)/(2・r)
r;杭中心からアンカー鉄筋7までの距離
となる。次に、軸力が比較的小さい場合((b))、その軸力で生じる圧縮ひずみをδ2とすると、回転角R2は、
2={(δc+δ2)+(δt−δ2)}/(2・r)
=(δc+δt)/(2・r)
となる。次に、引抜き力が作用する場合((c))、その軸力で生じる引張ひずみをδ3とすると、回転角R3は、
3={(δt+δ3)+(δc−δ3)}/(2・r)
=(δc+δt)/(2・r)
となる。
FIG. 4 is a schematic diagram showing a deformed state of the pile head 3 within the elastic range. First, when the axial force is relatively large ((a)), the compressive strain caused by the axial force is δ 1 , the compressive strain due to the bending moment M is δ c , and the tensile strain due to the bending moment M is δ t . Then, the rotation angle R 1 is
R 1 = {(δ c + δ 1 ) + (δ t −δ 1 )} / (2 · r)
= (Δ c + δ t ) / (2 · r)
r: Distance from the center of the pile to the anchor reinforcement 7 Next, when the axial force is relatively small ((b)), assuming that the compressive strain caused by the axial force is δ 2 , the rotation angle R 2 is
R 2 = {(δ c + δ 2 ) + (δ t −δ 2 )} / (2 · r)
= (Δ c + δ t ) / (2 · r)
It becomes. Next, when the pulling force is applied ((c)), if the tensile strain generated by the axial force is δ 3 , the rotation angle R 3 is
R 3 = {(δ t + δ 3 ) + (δ c −δ 3 )} / (2 · r)
= (Δ c + δ t ) / (2 · r)
It becomes.

ここで、曲げモーメントMが同じであれば、δc、δtも一定だから、回転角R1,R2,R3は同じ値となり、所定の曲げモーメントMに対する回転角R、すなわち回転剛性は軸力の大きさに依存しないことがわかる。 Here, if the bending moment M is the same, since δ c and δ t are also constant, the rotation angles R 1 , R 2 , and R 3 have the same value, and the rotation angle R with respect to the predetermined bending moment M, that is, the rotation rigidity is It can be seen that it does not depend on the magnitude of the axial force.

以上説明したように、本実施形態に係る杭頭接合構造21及びその構築に用いる杭頭接合用仮設具1によれば、杭頭3の回転剛性は軸力に依存しなくなり、設計プロセスを簡略化することが可能となる。   As described above, according to the pile head joining structure 21 and the pile head joining temporary tool 1 used for the construction according to the present embodiment, the rotational rigidity of the pile head 3 does not depend on the axial force, and the design process is simplified. Can be realized.

本実施形態では、被冠部材10を杭頭3に被せるにあたり、円筒体9の内周面が杭頭3の周面に重なるように被せたが、これに代えて図5に示すように、円筒体9の外周面と杭頭3の周面とがほぼ面一となるように該円筒体の下端を杭頭3の端板4周縁に載せるように被せてもかまわない。   In this embodiment, when covering the crowned member 10 on the pile head 3, it was covered so that the inner peripheral surface of the cylindrical body 9 overlapped with the peripheral surface of the pile head 3, but instead of this, as shown in FIG. The lower end of the cylindrical body may be placed on the periphery of the end plate 4 of the pile head 3 so that the outer peripheral surface of the cylindrical body 9 and the peripheral surface of the pile head 3 are substantially flush with each other.

また、本実施形態では、基礎部材に形成された埋込み凹部の凹部天井面を端板の上面から離間させる構成として、被冠部材10を用いた例を説明したが、上述した構成を実現するにあたっては、かかる構成に限定されるものではなく、基礎部材と端板との圧縮力伝達による回転拘束が生じない限り、いかなる構成でもかまわない。   Further, in this embodiment, the example using the crowned member 10 has been described as the configuration in which the recessed ceiling surface of the embedded recessed portion formed in the base member is separated from the upper surface of the end plate, but in realizing the above-described configuration However, the present invention is not limited to such a configuration, and any configuration may be used as long as rotation restraint due to transmission of compressive force between the base member and the end plate does not occur.

すなわち、被冠部材10は、埋込み凹部の凹部天井面と端板との離間を確保するとともに、それらの間にフレッシュコンクリートが流入するのを防止するいわば型枠部材として機能するものであり、その意味では、被冠部材10に代えて、現場で型枠を適宜配置するようにしてもかまわない。   That is, the crown member 10 functions as a so-called formwork member that secures the separation between the recessed ceiling surface of the recessed recessed portion and the end plate and prevents fresh concrete from flowing between them. In terms of meaning, instead of the crowned member 10, a formwork may be appropriately arranged at the site.

さらには、型枠部材を省略し、図6に示すように、杭頭3を、その埋込み深さがDとなるように深さD′の埋込み凹部に埋め込むことで、埋込み凹部の凹部天井面11′を杭頭3に設けられた端板4の上面から離間させるようにしてもかまわない。   Furthermore, the formwork member is omitted, and as shown in FIG. 6, the pile head 3 is embedded in the embedded concave portion having a depth D ′ so that the embedded depth is D. 11 'may be separated from the upper surface of the end plate 4 provided on the pile head 3.

また、本実施形態では、被冠部材10を杭頭3に被せる際、該被冠部材を構成する円筒体9の内周面と杭頭3の周面とを重ねた上、両者を接着剤で仮固定することで、被冠部材10の円形天板8と端板4との離間状態を保持するようにしたが、これに代えて図7に示すように、アンカー鉄筋7に予め管状のスペーサ61を嵌め入れ、かかる状態で被冠部材10を杭頭3に被せるようにしてもよい。   Moreover, in this embodiment, when covering the crowned member 10 on the pile head 3, after overlapping the inner peripheral surface of the cylindrical body 9 and the peripheral surface of the pile head 3 which comprise this crowned member, both are adhesives However, instead of this, as shown in FIG. 7, the anchor rebar 7 has a tubular shape in advance. The spacer 61 may be fitted and the crown member 10 may be placed on the pile head 3 in such a state.

かかる構成においては、本発明の杭頭接合用仮設具は、被冠部材10に加えて、スペーサ61をあらたに備えることになる。   In such a configuration, the pile head joining temporary tool of the present invention newly includes the spacer 61 in addition to the crowned member 10.

円筒状のスペーサ61は、その高さがΔhとなるように製作しておくとともに、コンクリート打設時はフレッシュコンクリートの圧力を支持して円形天板8と端板4との離間状態をΔhに保持する一方、コンクリート硬化後は、基礎スラブ6が杭頭3に回転拘束を及ぼさないよう、その弾塑性特性を適宜設定しておく。   The cylindrical spacer 61 is manufactured so that the height thereof is Δh, and when placing the concrete, the pressure of the fresh concrete is supported and the separation state between the circular top plate 8 and the end plate 4 is set to Δh. On the other hand, after the concrete is hardened, its elasto-plastic characteristics are appropriately set so that the foundation slab 6 does not constrain the pile head 3 from rotating.

例えば、フレッシュコンクリートの圧力は支持するが、地震時に発生する基礎スラブ6と杭頭3との強制回転変形によって脆性破壊するように構成しておけばよい。   For example, the pressure of fresh concrete is supported, but the brittle fracture may be caused by the forced rotational deformation of the foundation slab 6 and the pile head 3 generated during an earthquake.

なお、スペーサは、円筒状のスペーサ61に限定されるものではなく、上述の機能を有するものであればその構成は任意である。例えば、波板状に形成された環状スペーサを端板4の上面と円形天板8との間に配置するようにしてもかまわない。   The spacer is not limited to the cylindrical spacer 61, and the configuration thereof is arbitrary as long as it has the above-described function. For example, an annular spacer formed in a corrugated plate shape may be arranged between the upper surface of the end plate 4 and the circular top plate 8.

また、本実施形態では特に言及しなかったが、上述した構成によってもなおフレッシュコンクリートが円形天板8と端板4との間に流入する懸念があるのであれば、図8に示すように被冠部材10を構成する円筒体9の下方縁部に沿って耐水性テープ71を貼着することで、杭頭3との隙間を塞ぐようにしてもかまわない。   Although not particularly mentioned in the present embodiment, if there is a concern that the fresh concrete may still flow between the circular top plate 8 and the end plate 4 even with the above-described configuration, as shown in FIG. You may make it block | close the clearance gap with the pile head 3 by sticking the water-resistant tape 71 along the lower edge part of the cylindrical body 9 which comprises the crown member 10. FIG.

また、耐水性テープ71に代えて図9に示すように、円形天板8と杭頭3との間にコンクリート流入防止材81を充填又は配置するようにしてもよい。   Further, instead of the water-resistant tape 71, as shown in FIG. 9, a concrete inflow prevention material 81 may be filled or disposed between the circular top plate 8 and the pile head 3.

かかるコンクリート流入防止材81は、フレッシュコンクリート硬化後、基礎スラブ6が杭頭3に回転拘束を及ぼさないように、弾性変形し、収縮し、又は脆性破壊する材料、例えばスポンジや、発泡スチロール、発泡ウレタンその他の発泡系材料で構成することができる。   The concrete inflow preventing material 81 is a material that elastically deforms, contracts, or brittlely breaks so that the foundation slab 6 does not restrain the rotation of the pile head 3 after the fresh concrete is cured, for example, sponge, foamed polystyrene, foamed urethane. It can be composed of other foam materials.

コンクリート流入防止材81を発泡系材料で構成した場合、円形天板8と杭2の端板4との離間状態を保持するスペーサとしての役割も果たす。   When the concrete inflow prevention material 81 is made of a foam material, it also serves as a spacer for maintaining a separated state between the circular top plate 8 and the end plate 4 of the pile 2.

なお、かかる構成においては、本発明の杭頭接合用仮設具は、被冠部材10に加えて、コンクリート流入防止材81をあらたに備えることになる。   In this configuration, the pile head joining temporary tool of the present invention newly includes the concrete inflow preventing material 81 in addition to the crowned member 10.

また、本実施形態では、アンカー鉄筋7で杭頭接合用ロッドを構成したが、本発明に係る杭頭接合用ロッドは、杭頭の曲げモーメントを圧縮力及び引張力で支持できる限り、どのように構成してもかまわない。   Moreover, in this embodiment, the pile head joining rod was comprised with the anchor reinforcing bar 7, However, As long as the pile head joining rod which concerns on this invention can support the bending moment of a pile head with a compressive force and a tensile force, how It may be configured as follows.

図10及び図11は、端板4に立設されたロッド部材93と該ロッド部材の上端近傍に取り付けられた定着板92とロッド部材93が挿通されるシース管91とで杭頭接合用ロッド94を構成したものである。   10 and 11 show a rod head joint rod comprising a rod member 93 erected on the end plate 4, a fixing plate 92 attached in the vicinity of the upper end of the rod member, and a sheath tube 91 through which the rod member 93 is inserted. 94 is constructed.

シース管91は、ロッド部材93の変形を拘束しないよう、可撓性チューブで構成するのが望ましい。   The sheath tube 91 is preferably composed of a flexible tube so as not to restrain the deformation of the rod member 93.

定着板92は、円形又は多角形状に形成することが可能であり、想定地震動における引抜き力に対して余裕をもって該引抜き力を支持できるように構成しておく。   The fixing plate 92 can be formed in a circular shape or a polygonal shape, and is configured to support the pulling force with a margin with respect to the pulling force in the assumed earthquake motion.

ロッド部材93は、定着板92を螺着するための雄ネジが上端に切られたネジ鉄筋を採用してあるが、これに代えて通常の異形鉄筋を採用してもかまわない。かかる場合には、異形鉄筋にネジを切るか、又は異形鉄筋に定着板92を溶着すればよい。   The rod member 93 employs a screw rebar in which a male screw for screwing the fixing plate 92 is cut at the upper end, but a normal deformed rebar may be employed instead. In such a case, a screw may be cut into the deformed reinforcing bar, or the fixing plate 92 may be welded to the deformed reinforcing bar.

かかる変形例によれば、ロッド部材93がアンボンド処理されるため、ロッド部材93の伸びが大きくなって杭頭3の回転剛性を小さく設定することが可能になり、杭頭の固定度を小さくすることができる。   According to such a modification, since the rod member 93 is unbonded, the elongation of the rod member 93 is increased, and the rotational rigidity of the pile head 3 can be set small, and the fixing degree of the pile head is reduced. be able to.

なお、図10及び図11は、ロッド部材93のほぼ全長をシース管91で覆ってあるため、定着板92のみが定着部となり、ロッド部材93はいわば非定着部となるが、これに代えて、シース管91の長さを短くしロッド部材93の一部を露出させるようにすれば、露出されたロッド部材93の部分があらたな定着部となる。   10 and 11, since almost the entire length of the rod member 93 is covered with the sheath tube 91, only the fixing plate 92 serves as a fixing portion, and the rod member 93 serves as a non-fixing portion. If the length of the sheath tube 91 is shortened and a part of the rod member 93 is exposed, the exposed portion of the rod member 93 becomes a new fixing portion.

さらに言えば、シース管91を省略してもかまわない。かかる変形例によれば、定着板92が定着部として機能するのみならず、ロッド部材93がその全長にわたって定着部として機能する。   Furthermore, the sheath tube 91 may be omitted. According to such a modification, not only the fixing plate 92 functions as a fixing unit, but also the rod member 93 functions as a fixing unit over the entire length thereof.

本実施形態に係る杭頭接合構造及びその構築に用いる杭頭接合用仮設具の断面図。Sectional drawing of the pile head joining structure used for the pile head joining structure which concerns on this embodiment, and its construction. 本実施形態に係る杭頭接合用仮設具の斜視図。The perspective view of the temporary tool for pile head joining which concerns on this embodiment. 本実施形態の作用を示す概念図。The conceptual diagram which shows the effect | action of this embodiment. 同じく作用を示す模式図。The schematic diagram which similarly shows an effect | action. 変形例に係る杭頭接合構造を示した断面図。Sectional drawing which showed the pile head junction structure which concerns on a modification. 被冠部材を省略した杭頭接合構造の断面図。Sectional drawing of the pile head junction structure which abbreviate | omitted the crowned member. スペーサを備えた杭頭接合用仮設具及びそれを用いた杭頭接合構造の断面図。Sectional drawing of the pile head joining structure using the temporary tool for pile head joining provided with the spacer. 耐水性テープでコンクリートの流入防止を図った杭頭接合構造の断面図。Sectional drawing of the pile head joint structure which aimed at the inflow prevention of concrete with water-resistant tape. 収縮性充填材を備えた杭頭接合用仮設具及びそれを用いた杭頭接合構造の断面図。Sectional drawing of the temporary tool for pile head joining provided with the shrinkable filler, and a pile head joined structure using the same. ロッド部材、定着板及びシース管で杭頭接合用ロッドを構成した変形例に係る杭頭接合用仮設具の斜視図。The perspective view of the temporary tool for pile head joining which concerns on the modification which comprised the rod for pile head joining with the rod member, the fixing board, and the sheath pipe | tube. 同じく杭頭接合用仮設具及びそれを用いた杭頭接合構造を示した断面図。Sectional drawing which similarly showed the temporary tool for pile head joining, and the pile head joint structure using the same.

符号の説明Explanation of symbols

1 杭頭接合用仮設具
2 杭
3 頭部、杭頭
4 端板
5 上部構造物
6 基礎スラブ(基礎部材)
7 アンカー鉄筋(杭頭接合用ロッド)
8 円形天板(被冠部材)
9 円筒体(被冠部材)
10 被冠部材
11,11′ 凹部天井面
21 杭頭接合構造
61 スペーサ
81 コンクリート流入防止材
91 シース管
92 定着板
93 ロッド部材
94 杭頭接合用ロッド
1 Temporary tool for pile head joint 2 Pile 3 Head, pile head 4 End plate 5 Upper structure 6 Foundation slab (foundation member)
7 Anchor rebar (Pile head joint rod)
8 Circular top plate (crown member)
9 Cylindrical body (crown member)
DESCRIPTION OF SYMBOLS 10 Crowned member 11, 11 'Recessed ceiling surface 21 Pile head joining structure 61 Spacer 81 Concrete inflow prevention material 91 Sheath pipe 92 Fixing plate 93 Rod member 94 Pile head joining rod

Claims (6)

杭の頭部を上部構造物の基礎部材に埋め込んでなる杭頭接合構造において、
前記杭の頭部に設けられた端板に杭頭接合用ロッドを立設して前記基礎部材に埋設し、前記杭の頭部が埋め込まれた前記基礎部材の埋込み凹部の内面のうち、凹部天井面を、前記上部構造物からの鉛直荷重が前記杭頭接合用ロッドのみを介して前記杭に伝達されるように前記端板の上面から離間させたことを特徴とする杭頭接合構造。
In the pile head joint structure in which the head of the pile is embedded in the foundation member of the superstructure,
Of the inner surface of the embedding recessed portion of the foundation member in which the pile head connecting rod is erected on the end plate provided on the head of the pile and embedded in the foundation member, The pile head joint structure characterized in that the ceiling surface is separated from the upper surface of the end plate so that a vertical load from the upper structure is transmitted to the pile only through the pile head joint rod .
前記杭頭接合用ロッドを、前記端板に立設されたロッド部材と該ロッド部材の所定位置に取り付けられた定着板とで構成した請求項1記載の杭頭接合構造。 The pile head joining structure according to claim 1, wherein the pile head joining rod is composed of a rod member erected on the end plate and a fixing plate attached to a predetermined position of the rod member. 前記ロッド部材が挿通されるシース管を前記杭頭接合用ロッドに備えた請求項2記載の杭頭接合構造。 The pile head joint structure according to claim 2, wherein a sheath pipe through which the rod member is inserted is provided in the pile head joint rod. 杭の頭部に設けられる端板に立設された杭頭接合用ロッドを前記杭の頭部が埋め込まれる上部構造物の基礎部材に埋設してなる杭頭接合構造に用いる杭頭接合用仮設具であって、前記杭頭接合用ロッドが挿通される挿通孔が形成された円形天板及び該円形天板の周縁に垂設された円筒体からなる被冠部材を備えるとともに、該被冠部材を、前記円形天板に形成された前記挿通孔に前記杭頭接合用ロッドが挿通された状態で前記杭の頭部に被せることができるように構成してなり、前記被冠部材は、前記基礎部材の形成時にフレッシュコンクリートを打設する際、前記円形天板と前記端板との離間状態が保持されるようにかつ前記円形天板と前記杭の頭部との間にフレッシュコンクリートが流入しないように構成してあるとともに、フレッシュコンクリート硬化後は、前記上部構造物からの鉛直荷重が前記杭頭接合用ロッドのみを介して前記杭に伝達されるようにすることで前記基礎部材が前記杭の頭部に回転拘束を及ぼさないように構成してあることを特徴とする杭頭接合用仮設具。 Pile head joint temporary construction used for a pile head joint structure in which a pile head joint rod erected on an end plate provided at the head of the pile is buried in a foundation member of an upper structure in which the pile head is embedded A circular top plate with an insertion hole through which the rod for joining the pile heads is inserted, and a crowned member made of a cylindrical body suspended from the periphery of the circular top plate, The member is configured to be able to cover the head of the pile in a state where the pile head joining rod is inserted through the insertion hole formed in the circular top plate, When placing the fresh concrete during the formation of the foundation member, the fresh concrete is placed between the circular top plate and the head of the pile so that the separated state of the circular top plate and the end plate is maintained. It is configured not to flow in and is fresh After Nkurito curing, said base member by a vertical load from the superstructure is to be transmitted to the pile via only the pile head joint rod does not exert a rotational restraint to the head of the pile It is comprised as follows. The temporary tool for pile head joining characterized by the above-mentioned. 前記円形天板と前記杭の頭部との間に充填又は配置されるコンクリート流入防止材を備えた請求項4記載の杭頭接合用仮設具。 The temporary tool for pile head joining of Claim 4 provided with the concrete inflow prevention material filled or arrange | positioned between the said circular top plate and the head of the said pile. 杭の頭部に設けられる端板に立設された杭頭接合用ロッドを前記杭の頭部が埋め込まれる上部構造物の基礎部材に埋設してなる杭頭接合構造に用いる杭頭接合用仮設具であって、前記杭頭接合用ロッドが挿通される挿通孔が形成された円形天板及び該円形天板の周縁に垂設された円筒体からなる被冠部材を備えるとともに、該被冠部材を、前記円形天板に形成された前記挿通孔に前記杭頭接合用ロッドが挿通された状態で前記杭の頭部に被せることができるように構成してなり、前記被冠部材は、前記基礎部材の形成時にフレッシュコンクリートを打設する際、前記円形天板と前記端板との離間状態が保持されるようにかつ前記円形天板と前記杭の頭部との間にフレッシュコンクリートが流入しないように構成してあるとともに、フレッシュコンクリート硬化後は、前記基礎部材が前記杭の頭部に回転拘束を及ぼさないように構成してあり、前記円形天板と前記杭の頭部との間に介装されそれらの離間状態を保持するスペーサを備えたことを特徴とする杭頭接合用仮設具。 Pile head joint temporary construction used for a pile head joint structure in which a pile head joint rod erected on an end plate provided at the head of the pile is buried in a foundation member of an upper structure in which the pile head is embedded A circular top plate with an insertion hole through which the rod for joining the pile heads is inserted, and a crowned member made of a cylindrical body suspended from the periphery of the circular top plate, The member is configured to be able to cover the head of the pile in a state where the pile head joining rod is inserted through the insertion hole formed in the circular top plate, When placing the fresh concrete during the formation of the foundation member, the fresh concrete is placed between the circular top plate and the head of the pile so that the separated state of the circular top plate and the end plate is maintained. It is configured not to flow in and is fresh After hardening, the foundation member is constructed so as not to restrain rotation of the head of the pile, and is interposed between the circular top plate and the head of the pile to maintain the separated state. A temporary tool for joining a pile head, characterized by comprising a spacer to be used.
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JP3825795B2 (en) * 2002-03-18 2006-09-27 岡部株式会社 Pile head joint structure
JP4111262B2 (en) * 2002-07-15 2008-07-02 三谷セキサン株式会社 Connection structure between foundation pile and superstructure, pile head joint, connection method between foundation pile and superstructure

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