JP5233796B2 - Pile-to-body joint structure, pile-to-body joint method, PC member, steel pipe - Google Patents
Pile-to-body joint structure, pile-to-body joint method, PC member, steel pipe Download PDFInfo
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本発明は、鉄筋コンクリート造の杭と躯体との接合部における曲げ剛性を低下させた接合構造に関する。 The present invention relates to a joint structure in which bending rigidity is reduced at a joint portion between a reinforced concrete pile and a frame.
基礎躯体又は建物の躯体の下部に、杭が接合されてなる建物に水平力が作用すると、躯体と杭の接合部に大きな曲げ荷重が作用する。従来はこのような曲げ荷重に抵抗するべく、鉄筋を多数配筋する方法や杭の断面を大きくする方法を用いていたが、前者の方法では鉄筋量が増えるとともに配筋に手間がかかるという問題が、また、後者の方法では杭の断面が大きくなるため、コスト高になるという問題があった。 When a horizontal force acts on a building in which a pile is joined to the lower part of the foundation frame or the building frame, a large bending load acts on the joint between the frame and the pile. Conventionally, in order to resist such bending load, a method of arranging a large number of reinforcing bars or a method of enlarging the cross section of the pile was used, but the former method increases the amount of reinforcing bars and takes time to arrange the bars. However, the latter method has a problem that the cross-section of the pile becomes large, which increases the cost.
これに対して、例えば、特許文献１には、躯体と杭とを間をあけて構築し、この躯体と杭との間を杭よりも断面が小さいコンクリート部材（以下、小径部という）を介して接合する方法が記載されている。かかる方法によれば、躯体と杭との接合部に作用する曲げ荷重を低下させるとともに、躯体と杭との接合部における鉄筋を減らし、配筋の手間を削減することができ、また、杭の断面を小さくし、コストを削減できる。 On the other hand, for example, in Patent Document 1, a frame and a pile are constructed with a gap between them, and a concrete member (hereinafter referred to as a small diameter portion) having a smaller cross section than the pile is formed between the frame and the pile. The method of joining is described. According to this method, the bending load acting on the joint between the frame and the pile can be reduced, the reinforcing bars at the joint between the frame and the pile can be reduced, and the labor for arranging the bars can be reduced. The cross section can be reduced, and the cost can be reduced.
本願発明者らは、後に詳述するようにこのように躯体と杭との間に小径部を設けた場合、杭に大きな圧縮力が作用すると小径部の下部に楔状の破壊局面が形成され、杭を外側に向かって押し広げるように破壊が起こることを実験により見出した。 As described in detail later, the present inventors have provided a small-diameter portion between the frame and the pile in this way, and when a large compressive force acts on the pile, a wedge-shaped fracture phase is formed at the lower portion of the small-diameter portion, Experiments have found that fracture occurs as the piles are pushed outward.
本発明の目的は、杭と躯体との間に小径部を設ける場合に、杭の小径部の下方に生じる破壊を防止するとともに、小径部において軸力及びせん断力を伝達できるようにすることである。 The purpose of the present invention is to prevent breakage that occurs below the small-diameter portion of the pile when the small-diameter portion is provided between the pile and the frame, and to transmit axial force and shear force in the small-diameter portion. is there.
本発明は、コンクリート造の杭と躯体の接合構造であって、前記杭と前記躯体との間に、その径が杭の径に比べて小さくなるように形成された小径部が介在されてなり、前記杭は、その外周に沿うように埋設された外部鉄筋かごと、前記外部鉄筋かごの内周側に前記小径部の下方の少なくとも一部のコンクリートを囲むように埋設されることで、前記小径部の下方のコンクリートの逆円錐状の破断を抑える杭内部拘束部材とを備えることを特徴とする。 The present invention is a joint structure between a concrete pile and a frame, and a small-diameter portion formed such that the diameter thereof is smaller than the diameter of the pile is interposed between the pile and the frame. the pile includes an external reinforcement cage embedded along the outer periphery thereof, by the is embedded as the inner peripheral side of the outer reinforcement cage surrounds at least a portion of the concrete below the small diameter portion, wherein and a stake inner restraining member to suppress the reverse conical fracture of the concrete below the small-diameter portion and said Rukoto.
上記の杭と躯体の接合構造において、前記小径部は、周囲を取り囲む小径部拘束部材を備えてもよい。
また、前記杭内部拘束部材は、前記小径部の下方の少なくとも一部のコンクリートを囲むように設けられたフープ筋を有してもよい。
In the joint structure of the pile and the frame, the small diameter portion may include a small diameter portion restraining member surrounding the periphery.
Moreover, the said pile internal restraint member may have a hoop reinforcement provided so that at least one part concrete below the said small diameter part may be enclosed.
また、前記杭内部拘束部材は、前記小径部の直径をＤとした場合に、その上下方向の長さが（Ｄ／２）×（１／ｔａｎ２２．５°）以上であってもよい。また、前記杭内部拘束部材は、前記小径部の直下のコンクリートを囲うように配されていてもよい。 Moreover, when the diameter of the said small diameter part is set to D as for the said pile internal restraint member, the length of the up-down direction may be more than (D / 2) x (1 / tan22.5 degrees). Moreover, the said pile internal restraint member may be distribute | arranged so that the concrete directly under the said small diameter part may be enclosed.
また、本発明は、コンクリート造の杭と躯体の接合方法であって、前記杭と前記躯体との間に、その径が杭の径に比べて小さくなるように形成された小径部を介在させ、前記杭に、その外周に沿うように外部鉄筋かごを埋設し、前記杭における前記外部鉄筋かごの内周側に、前記小径部の下方の少なくとも一部のコンクリートを囲むことで、前記小径部の下方のコンクリートの逆円錐状の破断が抑えられるように杭内部拘束部材を埋設しておくことを特徴とする。 Further, the present invention is a method for joining a concrete pile and a frame, and a small-diameter portion formed such that the diameter thereof is smaller than the diameter of the pile is interposed between the pile and the frame. , the pile, the external reinforcement cage embedded along its outer periphery, the inner periphery of the outer reinforcement cage in the pile, at least a portion of the concrete below the small diameter portion in enclosed Mukoto, the small The pile internal restraint member is embedded so that the reverse conical breakage of the concrete below the portion can be suppressed .
また、本発明は、外周に沿うように外部鉄筋かごが埋設されたコンクリート造の杭と躯体との間に、その径が杭の径に比べて小さくなるように形成された小径部が介在されてなる杭と躯体の接合構造を構築する際に用いられるプレキャストコンクリート部材であって、前記小径部を構成し、前記杭における前記外部鉄筋かごの内周側に前記小径部の下方の少なくとも一部のコンクリートを囲むことで、前記小径部の下方のコンクリートの逆円錐状の破断を抑えるように埋設されるべき杭内部拘束部材が一体化されたことを特徴とする。 Further, according to the present invention, a small-diameter portion formed such that its diameter is smaller than the diameter of the pile is interposed between the concrete pile and the frame in which the external rebar cage is embedded along the outer periphery. Is a precast concrete member used when constructing a joint structure between a pile and a frame, wherein the small-diameter portion is configured, and at least a part below the small-diameter portion on the inner peripheral side of the external rebar cage in the pile concrete at circumference Mukoto, wherein the reverse conical pile internal constraining member to be embedded so as to suppress breakage of the concrete below the small diameter portion are integrated.
また、本発明は、外周に沿うように外部鉄筋かごが埋設されたコンクリート造の杭と躯体との間に、その径が杭の径に比べて小さくなるように形成された小径部が介在されてなる杭と躯体の接合構造において前記小径部を取り囲むように設けられるべき鋼管であって、前記杭における前記外部鉄筋かごの内周側に前記小径部の下方の少なくとも一部のコンクリートを囲むことで、前記小径部の下方のコンクリートの逆円錐状の破断を抑えるように埋設されるべき杭内部拘束部材が一体化されたことを特徴とする。 Further, according to the present invention, a small-diameter portion formed such that its diameter is smaller than the diameter of the pile is interposed between the concrete pile and the frame in which the external rebar cage is embedded along the outer periphery. wherein a steel tube to be provided to surround the small diameter portion in the joining structure of the pile and the frame comprising Te, at least a part of concrete enclose below said small-diameter portion on the inner peripheral side of the outer reinforcing bar cage in the pile Thus, the pile internal restraint member to be embedded so as to suppress the reverse conical breakage of the concrete below the small diameter portion is integrated.
本発明によれば、杭の小径部の下方のコンクリートを囲繞するように杭内部拘束部材が埋設されているため、小径部の下方に楔状の破壊局面が形成され、この楔状の部分が周囲のコンクリートを押し広げるような力が作用しても、杭内部拘束部材がこれに抵抗し、破壊が生じるのを防止できる。 According to the present invention, since the pile internal restraining member is embedded so as to surround the concrete below the small-diameter portion of the pile, a wedge-shaped fracture phase is formed below the small-diameter portion, and this wedge-shaped portion is surrounded by Even if a force that spreads concrete acts, the pile internal restraining member resists this and can prevent destruction.
まず、本願発明者らは、建物の躯体と杭の間に小径部が介在してなる接合構造に圧縮力が作用した際の破壊状況を調べるため、上記の接合構造を模した試験体を用いて圧縮実験を行ったので説明する。 First, the inventors of the present application use a test body that imitates the above-mentioned joint structure in order to investigate the breaking situation when compressive force is applied to the joint structure in which a small-diameter portion is interposed between the building frame and the pile. A compression experiment was performed and will be described.
図１は、本実験で用いた試験体１１０を示す図である。同図に示すように、本実験で用いた試験体１１０は、杭の上部を模した直径２００ｍｍ（実物の約１／８スケール）、高さ３００ｍｍの円柱状のコンクリート部材（以下、杭部１３０という）と、杭部１３０の上部に一体に構築され、小径部を模した直径１２０ｍｍ、高さ２５ｍｍの円柱状のコンクリート部材（以下、小径部という）１４０とにより構成される。杭部１３０の上部４０ｍｍ及び小径部１４０は設計強度４８Ｎ／ｍｍ２のコンクリートが用いられ、杭部１３０の残り部分は２７Ｎ／ｍｍ２のコンクリートが用いられている。
本実験では、この試験体１１０に上下の載荷台により荷重を作用させて、破壊状況を調べた。
FIG. 1 is a view showing a test body 110 used in this experiment. As shown in the figure, a test body 110 used in this experiment is a columnar concrete member (hereinafter referred to as a pile portion 130) having a diameter of 200 mm (about 1/8 scale of the actual size) and a height of 300 mm, which imitates an upper portion of a pile. And a columnar concrete member (hereinafter referred to as a small diameter portion) 140 having a diameter of 120 mm and a height of 25 mm, which is constructed integrally with the upper portion of the pile portion 130 and imitates the small diameter portion. Top 40mm and the small-diameter portion 140 of the pile section 130 is used concrete design strength 48N / mm 2, the remainder of the pile 130 concrete 27N / mm 2 is used.
In this experiment, a load was applied to the test body 110 by the upper and lower loading platforms, and the fracture state was examined.
図２は、圧縮破壊した試験体を示す図である。同図に示すように、試験体１１０に圧縮荷重を作用させると、杭部１３０の小径部１４０の下部に相当する位置に楔状（逆円錐状）の破断面（図中、破線を付して示す）が生じ、この楔状の部分の周囲のコンクリートが剥がれ落ちて破壊した。なお、楔状の破断面は頂角が約４５°であった。 FIG. 2 is a diagram showing a test specimen that has undergone compression fracture. As shown in the figure, when a compressive load is applied to the test body 110, a wedge-shaped (inverted conical) fracture surface (indicated by a broken line in the figure) is provided at a position corresponding to the lower portion of the small-diameter portion 140 of the pile portion 130. The concrete around this wedge-shaped part peeled off and was destroyed. The wedge-shaped fracture surface had an apex angle of about 45 °.
このように、本実験から、小径部を介して杭と躯体とが接合された接合部に圧縮荷重が作用すると、図３に示すように、杭３０を構成するコンクリートにおいて小径部４０の下部に頂角が約４５°となるような逆円錐状の面において破断することがわかり、この逆円錐状の部分（以下、楔部という）の周囲のコンクリートには、この楔部を構成するコンクリートにより外側へ向かって押し広げられるような応力が作用すると考えられる。 In this way, from this experiment, when a compressive load acts on the joint where the pile and the housing are joined via the small diameter portion, as shown in FIG. It can be seen that the fracture occurs on an inverted conical surface having an apex angle of about 45 °, and the concrete surrounding the inverted conical portion (hereinafter referred to as a wedge portion) is made by the concrete constituting the wedge portion. It is considered that a stress that spreads outward acts.
上記の実験結果をふまえ、本実施形態の躯体２０と杭３０との接合構造１０は以下のような構成とした。
図４は、本実施形態の接合構造１０を示す鉛直断面図であり、（Ａ）は鉛直断面図、（Ｂ）は（Ａ）におけるＩ−Ｉ´断面図である。同図に示すように、本実施形態の接合構造１０は、建物の躯体２０と、場所打ちコンクリート杭からなる杭３０とを接合するための構造であり、杭３０と躯体２０との間に小径部４０が介在してなる。小径部４０は、躯体２０及び杭３０にその上部及び下部が夫々埋入されている。
Based on the above experimental results, the joint structure 10 of the frame 20 and the pile 30 of the present embodiment has the following configuration.
4A and 4B are vertical cross-sectional views showing the joint structure 10 of the present embodiment, in which FIG. 4A is a vertical cross-sectional view and FIG. 4B is a cross-sectional view taken along line II ′ in FIG. As shown in the figure, the joint structure 10 of the present embodiment is a structure for joining a building frame 20 and a pile 30 made of cast-in-place concrete piles, and has a small diameter between the pile 30 and the frame 20. Part 40 is interposed. The upper and lower portions of the small-diameter portion 40 are embedded in the housing 20 and the pile 30, respectively.
躯体２０は、建物（不図示）の下部に一体に構築されており、建物から鉛直荷重及び水平力が作用する。躯体２０は、鉄筋コンクリート造であり、建物の荷重が作用する。 The housing 20 is integrally constructed at the lower part of a building (not shown), and a vertical load and a horizontal force act from the building. The frame 20 is a reinforced concrete structure, and the load of the building acts on it.
小径部４０は、円筒状の鋼管４１と、この鋼管４１内に打設されたコンクリート４２とにより構成される。鋼管４１の外周には、後述する杭３０を構成する内部鉄筋かご５０の上端が溶接接続されている。なお、鋼管４１及び内部鉄筋かご５０としては、これらを予め工場等において鋼管４１に内部鉄筋かご５０を溶接接続したものを製作し、現場に搬入して用いることができる。 The small diameter portion 40 is constituted by a cylindrical steel pipe 41 and concrete 42 placed in the steel pipe 41. On the outer periphery of the steel pipe 41, an upper end of an internal rebar cage 50 constituting a pile 30 described later is welded. In addition, as the steel pipe 41 and the internal rebar cage 50, those obtained by welding and connecting the internal rebar cage 50 to the steel pipe 41 in advance in a factory or the like can be manufactured and carried to the site for use.
杭３０は、地盤に円柱状に形成されたコンクリート３２と、このコンクリート３２の外周に沿うように埋設された円筒状に組まれた外部鉄筋かご３１と、小径部４０を構成する鋼管４１に上端が溶接接続された内部鉄筋かご５０と、により構成される。 The pile 30 has a concrete 32 formed in a columnar shape on the ground, a cylindrical outer reinforcing steel bar 31 embedded along the outer periphery of the concrete 32, and a steel pipe 41 constituting the small diameter portion 40 at the upper end. And an internal rebar cage 50 connected by welding.
内部鉄筋かご５０は、円周状に間隔をあけて配置された複数の縦筋５１と、これら複数の縦筋５１の外周を囲繞するように上下方向に間隔をあけて配置されたフープ筋５２とにより構成される。内部鉄筋かご５０は、上下方向の長さが、小径部４０の直径を底辺とし、頂角が４５°の二等辺三角形の高さよりも長くなるように形成されている。なお、この二等辺三角形の高さＬは、小径部４０の直径をＤとした場合に、（Ｄ／２）×（１／ｔａｎ２２．５°）となる。杭３０を構成するコンクリート３２の上部及び小径部４０を構成するコンクリート４１には、上記の試験体１１０と同様に周囲に比べて設計基準強度が高いコンクリートが用いられている。なお、縦筋５１は、フープ筋５２を保持できればよく、鉄筋以外の鋼材を用いてもよいし、また、その本数は問わない。 The internal rebar cage 50 includes a plurality of vertical bars 51 arranged circumferentially at intervals, and hoop bars 52 arranged at intervals in the vertical direction so as to surround the outer circumferences of the plurality of vertical bars 51. It consists of. The internal rebar cage 50 is formed such that its vertical length is longer than the height of an isosceles triangle having a base of the diameter of the small diameter portion 40 and an apex angle of 45 °. The height L of the isosceles triangle is (D / 2) × (1 / tan 22.5 °), where D is the diameter of the small diameter portion 40. For the concrete 41 constituting the upper part of the concrete 32 constituting the pile 30 and the small-diameter portion 40, concrete having a higher design standard strength than the surroundings is used as in the case of the test body 110. The vertical bars 51 may be any steel material other than reinforcing bars as long as the hoop bars 52 can be held, and the number of the bars does not matter.
躯体２０から小径部４０に鉛直荷重が作用すると、杭３０を構成するコンクリート３２には、小径部４０の下部の楔部から、その周囲の部分を押し広げるような応力が作用する。これに対して、本実施形態では、図４に示すように、コンクリート３２の小径部４０の下方に内部鉄筋かご５０が埋設されているため、内部鉄筋かご５０のフープ筋５２がコンクリート３２を拘束することにより、楔部から作用する力に対して抵抗する。さらに、上記の実験からわかるように、楔部は上下方向の長さが、小径部４０の直径を底辺とし、頂角が４５°の二等辺三角形の高さと略等しいが、上記のように内部鉄筋かご５０がこの長さよりも長く形成されているため、確実にフープ筋５２により楔部から作用する力に対して抵抗することができる。 When a vertical load acts on the small-diameter portion 40 from the housing 20, stress is applied to the concrete 32 constituting the pile 30 from the wedge portion at the lower part of the small-diameter portion 40 so as to spread the surrounding portion. On the other hand, in this embodiment, as shown in FIG. 4, since the internal rebar cage 50 is embedded below the small diameter portion 40 of the concrete 32, the hoop bars 52 of the internal rebar cage 50 restrain the concrete 32. This resists the force acting from the wedge portion. Further, as can be seen from the above experiment, the wedge portion has a vertical length that is substantially the same as the height of an isosceles triangle having a base of the diameter of the small diameter portion 40 and an apex angle of 45 °. Since the reinforcing bar 50 is formed longer than this length, the hoop bar 52 can surely resist the force acting from the wedge part.
本実施形態によれば、杭３０と躯体２０との間に小径部４０を介在させることにより、杭３０と躯体２０との接合構造１０における曲げ剛性を低下させることができる。 According to this embodiment, the bending rigidity in the joining structure 10 of the pile 30 and the housing 20 can be reduced by interposing the small diameter portion 40 between the pile 30 and the housing 20.
また、かかる構成の接合構造１０に鉛直荷重が作用すると、杭３０の小径部４０の下方の楔部から、その周囲のコンクリートに外側へ向けて押し広げるような荷重が作用するが、本実施形態では杭３０の小径部４０の下方に円筒状に組まれた内部鉄筋かご５０を埋設することとしたため、内部鉄筋かご５０のフープ筋５２がこの荷重に対して抵抗するため、破壊が防止され、鉛直耐力を確保でき、躯体２０と杭３０との間で十分なせん断力及び軸力の伝達が可能となる。 In addition, when a vertical load acts on the joint structure 10 having such a configuration, a load that spreads outward from the wedge portion below the small-diameter portion 40 of the pile 30 to the surrounding concrete acts. Then, since it was decided to embed the internal rebar cage 50 assembled in a cylindrical shape below the small-diameter portion 40 of the pile 30, the hoop bar 52 of the internal rebar cage 50 resists this load, thereby preventing breakage, The vertical proof stress can be ensured, and sufficient shearing force and axial force can be transmitted between the frame 20 and the pile 30.
なお、本実施形態では、小径部４０の下方に縦筋５１及びフープ５２筋からなる内部鉄筋かご５０を埋設する構成としたが、これに限らず、スパイラルフープを埋設することとしてもよい。また、内部鉄筋かごに代えてフープ状のＦＲＰ、鋼線、金網、スパイラル筋などを埋設することとしてもよい。 In addition, in this embodiment, although it was set as the structure which embeds the internal rebar cage | basket | car 50 which consists of the vertical reinforcement 51 and the hoop 52 reinforcement below the small diameter part 40, it is good also as embedding not only this but a spiral hoop. Further, a hoop-like FRP, a steel wire, a wire mesh, a spiral bar, or the like may be embedded instead of the internal reinforcing bar cage.
また、本実施形態では、小径部４０をコンクリート部材により構成したが、これに限らず、周囲を鋼管又はＦＲＰなどの拘束部材により囲繞したコンクリート部材により構成してもよい。このようにコンクリート部材の周囲を拘束部材により囲繞することで、拘束効果によりコンクリート部材の圧縮強度を向上させることができる。また、本実施形態では、鋼管４１に内部鉄筋かご５０の上部を接続するものとしたが、これに限らず、内部鉄筋かご５０を鋼管４１と間隔をあけて別体として設けることとしてもよい。 Moreover, in this embodiment, although the small diameter part 40 was comprised with the concrete member, you may comprise not only this but the concrete member surrounded by restraint members, such as a steel pipe or FRP. Thus, by surrounding the concrete member with the restraining member, the compressive strength of the concrete member can be improved due to the restraining effect. In the present embodiment, the upper part of the internal rebar cage 50 is connected to the steel pipe 41. However, the present invention is not limited to this, and the internal rebar cage 50 may be provided separately from the steel pipe 41.
また、本実施形態では、杭３０を構成するコンクリート３２の上部及び小径部４０を構成するコンクリート４２として周囲に比べて設計基準強度が高いものが用いたが、これに限らず、周囲と同程度の設計基準強度のコンクリートを用いてもよい。この場合、杭３０の上部を囲繞するように鋼管を設けるとよい。
また、本実施形態では、小径部４０の周囲を鋼管４１により囲繞するものとしたが、これに限らず、図５に示すように鋼管４１を省略してもよい。
In the present embodiment, the upper part of the concrete 32 constituting the pile 30 and the concrete 42 constituting the small-diameter portion 40 having higher design standard strength than the surroundings are used. Concrete with a design standard strength of may be used. In this case, it is good to provide a steel pipe so that the upper part of the pile 30 may be surrounded.
Moreover, in this embodiment, the circumference | surroundings of the small diameter part 40 shall be surrounded by the steel pipe 41, However, Not only this but the steel pipe 41 may be abbreviate | omitted as shown in FIG.
また、本実施形態では、小径部４０を構成するコンクリート４２を現場打ちするものとしたが、ＰＣ部材を用いてもよい。かかる場合には、小径部４０を構成するＰＣ部材と内部鉄筋かご５０とを予め一体に形成しておくことで、施工性を向上することができる。 Moreover, in this embodiment, although the concrete 42 which comprises the small diameter part 40 shall be hit on the spot, you may use a PC member. In such a case, the workability can be improved by forming the PC member constituting the small diameter portion 40 and the internal rebar cage 50 integrally in advance.
また、本実施形態では、小径部４０の上下を夫々躯体２０及び杭３０に埋め込むものとしたが、これに限らず、図６に示すように、小径部４０の上下を夫々躯体２０の下端及び杭３０の上端に接続するものとしてもよい。また、小径部４０の上下何れか一方のみを躯体２０又は杭３０に埋め込むこととしてもよい。 Moreover, in this embodiment, although the upper and lower sides of the small diameter part 40 shall be embedded in the housing 20 and the pile 30, respectively, it is not restricted to this, As shown in FIG. It is good also as what connects to the upper end of the pile 30. FIG. Further, only one of the upper and lower sides of the small diameter portion 40 may be embedded in the frame 20 or the pile 30.
また、本実施形態では、小径部４０と略同径な円筒状の内部鉄筋かご５０を用いるものとしたが、これに限らず、図７に示すように、小径部４０よりも大径の内部鉄筋かご５０を用いてもよく、また、図８に示すように、小径部４０よりも小径の内部鉄筋かご５０を用いてもよい。要するに、内部鉄筋かご５０を、杭３０を構成するコンクリート３２の小径部４０の下方の少なくとも一部を囲むように埋設すれば、本実施形態と同様の効果が得られる。なお、小径部４０と異なる径の内部鉄筋かご５０を用いる場合には、その径が小径部４０の径に近い方が、杭３０の小径部４０の下方の楔部から、その周囲のコンクリートに外側へ向けて押し広げるような荷重に確実に抵抗できる。 In the present embodiment, the cylindrical internal reinforcing bar 50 having the same diameter as that of the small-diameter portion 40 is used. However, the present invention is not limited to this, and as shown in FIG. A rebar cage 50 may be used, or an internal rebar cage 50 having a smaller diameter than the small diameter portion 40 may be used as shown in FIG. In short, if the internal rebar cage 50 is embedded so as to surround at least a part of the small diameter portion 40 of the concrete 32 constituting the pile 30, the same effect as in the present embodiment can be obtained. In addition, when using the internal rebar basket 50 of a different diameter from the small diameter part 40, the direction close | similar to the diameter of the small diameter part 40 is from the wedge part below the small diameter part 40 of the pile 30 to the surrounding concrete. It can reliably resist the load that spreads outward.
１０ 接合構造
２０ 躯体
３０ 杭
３１ 外部鉄筋かご
３２ コンクリート
４０ 小径部
４１ 鋼管
４２ コンクリート
５０ 内部鉄筋かご
５１ 縦筋
５２ フープ筋
DESCRIPTION OF SYMBOLS 10 Joining structure 20 Body 30 Pile 31 External rebar cage 32 Concrete 40 Small diameter part 41 Steel pipe 42 Concrete 50 Internal rebar cage 51 Longitudinal reinforcement 52 Hoop reinforcement
Claims (8)
前記杭と前記躯体との間に、その径が杭の径に比べて小さくなるように形成された小径部が介在されてなり、
前記杭は、その外周に沿うように埋設された外部鉄筋かごと、前記外部鉄筋かごの内周側に前記小径部の下方の少なくとも一部のコンクリートを囲むように埋設されることで、前記小径部の下方のコンクリートの逆円錐状の破断を抑える杭内部拘束部材とを備えることを特徴とする杭と躯体の接合構造。 It is a joint structure between a concrete pile and a frame,
Between the pile and the frame, a small-diameter portion formed such that its diameter is smaller than the diameter of the pile is interposed,
The pile includes an external reinforcement cage embedded along the outer periphery thereof, said by being embedded so as to surround at least a portion of the concrete below the small diameter portion on the inner peripheral side of the outer reinforcement cage, the small junction structure of piles and the frame, characterized in Rukoto a pile internal restraining member to suppress the reverse conical fracture of parts of the lower concrete.
前記小径部は、周囲を取り囲む小径部拘束部材を備えることを特徴とする杭と躯体の接合構造。 The joint structure according to claim 1,
The said small diameter part is equipped with the small diameter part restraining member surrounding the circumference | surroundings, The joining structure of a pile and a housing | casing characterized by the above-mentioned.
前記杭内部拘束部材は、前記小径部の下方の少なくとも一部のコンクリートを囲むように設けられたフープ筋を有することを特徴とする杭と躯体の接合構造。 The joint structure according to claim 1 or 2,
The pile internal restraining member has a hoop bar provided so as to surround at least a part of concrete below the small diameter portion.
前記杭内部拘束部材は、前記小径部の直径をＤとした場合に、その上下方向の長さが（Ｄ／２）×（１／ｔａｎ２２．５°）以上であることを特徴とする杭と躯体の接合構造。 It is the junction structure according to any one of claims 1 to 3,
The pile internal restraining member has a vertical length of (D / 2) × (1 / tan 22.5 °) or more when the diameter of the small diameter portion is D, The joint structure of the frame.
前記杭内部拘束部材は、前記小径部の直下のコンクリートを囲うように配されていることを特徴とする杭と躯体の接合構造。The pile internal constraining member is arranged so as to surround the concrete directly under the small diameter portion.
前記杭と前記躯体との間に、その径が杭の径に比べて小さくなるように形成された小径部を介在させ、
前記杭に、その外周に沿うように外部鉄筋かごを埋設し、
前記杭における前記外部鉄筋かごの内周側に、前記小径部の下方の少なくとも一部のコンクリートを囲むことで、前記小径部の下方のコンクリートの逆円錐状の破断が抑えられるように杭内部拘束部材を埋設しておくことを特徴とする杭と躯体の接合方法。 A method for joining a concrete pile and a frame,
Between the pile and the frame, interpose a small diameter portion formed so that its diameter is smaller than the diameter of the pile,
In the pile, embed an external rebar cage along the outer periphery,
The inner peripheral side of the outer reinforcing bar cage in the pile, with enclosed Mukoto at least a portion of the concrete below the small diameter portion, pile inside as inverse conical fracture of the concrete beneath the small-diameter portion is suppressed A method for joining a pile and a frame, characterized in that a restraining member is buried.
前記小径部を構成し、前記杭における前記外部鉄筋かごの内周側に前記小径部の下方の少なくとも一部のコンクリートを囲むことで、前記小径部の下方のコンクリートの逆円錐状の破断を抑えるように埋設されるべき杭内部拘束部材が一体化されたことを特徴とするプレキャストコンクリート部材。 Between the pile and the frame of the concrete structure in which the external rebar cage is embedded along the outer circumference, the small diameter part formed so that the diameter is smaller than the diameter of the pile is interposed. A precast concrete member used when constructing a joint structure,
Constitutes the small diameter portion, at least a portion of the concrete below the small diameter portion on the inner peripheral side of the outer reinforcing bar cage in the pile in enclosed Mukoto, an inverted conical fracture of the concrete beneath the small-diameter portion A precast concrete member in which a pile internal restraint member to be embedded so as to be suppressed is integrated.
前記杭における前記外部鉄筋かごの内周側に前記小径部の下方の少なくとも一部のコンクリートを囲むことで、前記小径部の下方のコンクリートの逆円錐状の破断を抑えるように埋設されるべき杭内部拘束部材が一体化されたことを特徴とする鋼管。 Between the pile and the frame of the concrete structure in which the external rebar cage is embedded along the outer circumference, the small diameter part formed so that the diameter is smaller than the diameter of the pile is interposed. A steel pipe to be provided so as to surround the small diameter portion in the joint structure,
In enclosed Mukoto at least a portion of the concrete below the small diameter portion on the inner peripheral side of the outer reinforcing bar cage in the pile, to be embedded so as to suppress reverse conical fracture of the concrete beneath the small-diameter portion A steel pipe in which a pile internal restraint member is integrated.
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