JP2000080648A - Ready-made concrete pile provided with reinforced cage on lower end part, reinforced cage, foundation pile structure and construction method for foundation pile - Google Patents
Ready-made concrete pile provided with reinforced cage on lower end part, reinforced cage, foundation pile structure and construction method for foundation pileInfo
- Publication number
- JP2000080648A JP2000080648A JP11164943A JP16494399A JP2000080648A JP 2000080648 A JP2000080648 A JP 2000080648A JP 11164943 A JP11164943 A JP 11164943A JP 16494399 A JP16494399 A JP 16494399A JP 2000080648 A JP2000080648 A JP 2000080648A
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- Prior art keywords
- ready
- concrete pile
- pile
- made concrete
- cage
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、杭穴内に埋設設
置される既製コンクリート杭であって、下端部に鉄筋か
ごを設けた既製コンクリート杭、その鉄筋かご、下端部
に鉄筋かごを設けた既製コンクリート杭を杭穴内に沈設
してなる基礎杭構造、及び基礎杭の構築方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ready-made concrete pile buried and installed in a pile hole, which is provided with a reinforcing cage at the lower end, a reinforcing cage, and a reinforcing cage at the lower end. The present invention relates to a foundation pile structure in which a concrete pile is laid in a pile hole, and a method for constructing a foundation pile.
【０００２】[0002]
【従来の技術】従来、図７に示すように、杭穴３９を掘
削し、杭穴３９内にセメントミルク４１等を充填し、該
杭穴３９内に、既製コンクリート杭３６を埋設する工法
が各種試みられている。この場合、既製コンクリート杭
３６の製造技術の発展や、高強度のセメントミルクの開
発により、これらを組合わせることにより高強度の基礎
杭の構築が期待されている。2. Description of the Related Art Conventionally, as shown in FIG. 7, a method of excavating a pile hole 39, filling a cement hole 41 with cement milk 41 or the like, and burying a ready-made concrete pile 36 in the pile hole 39 is known. Various attempts have been made. In this case, the development of the manufacturing technology of the ready-made concrete pile 36 and the development of high-strength cement milk are expected to construct a high-strength foundation pile by combining these.
【０００３】[0003]
【発明が解決しようとする課題】前記従来の技術では、
既製コンクリート杭３６の口径に見合った強度は発揮で
きるが、既製コンクリート杭３６と杭穴３９内のセメン
トミルク４１との一体化が不十分のため、掘削した杭穴
３９の径に見合った強度が得られなかった。In the above prior art,
Although the strength corresponding to the diameter of the ready-made concrete pile 36 can be exhibited, the strength corresponding to the diameter of the excavated pile hole 39 is insufficient due to insufficient integration of the ready-made concrete pile 36 and the cement milk 41 in the pile hole 39. Could not be obtained.
【０００４】例えば、セメントミルク４１が充填された
杭穴３９内に既製コンクリート杭（ストレート杭）３６
を埋設する。既製コンクリート杭３６に垂直荷重が作用
した際に、既製コンクリート杭３６の下面３７で、パン
チング抜けと称する亀裂４２、４２が生じて、固化した
セメントモルタルミルク４１の破壊が生じていた。For example, a ready-made concrete pile (straight pile) 36 is placed in a pile hole 39 filled with cement milk 41.
Buried. When a vertical load was applied to the ready-made concrete pile 36, cracks 42, 42 called punching-out occurred on the lower surface 37 of the ready-made concrete pile 36, and the solidified cement mortar milk 41 was broken.
【０００５】これは、既製コンクリート杭３６に垂直荷
重が作用した場合、既製コンクリート杭３６の外周縁
で、せん断力が伝搬して、鉛直方向と角θ（０°〜６０
°程度の範囲）の角度で、円錐状の底面に相当する部分
で支圧力を生じることによる剪断破壊により亀裂４２が
発生すると考えられる（図７（ａ））。[0005] When a vertical load is applied to the ready-made concrete pile 36, a shear force propagates at the outer peripheral edge of the ready-made concrete pile 36, and the angle θ (0 ° to 60 °)
It is considered that a crack 42 is generated due to shear fracture caused by generation of a supporting pressure at a portion corresponding to the conical bottom surface at an angle of about (° degree) (FIG. 7A).
【０００６】また、ストレート杭と同様に、節部を有す
る既製コンクリート杭３６を使用した場合においては、
底面３７のみならず各節部３８、３８の外周縁におい
て、同様に亀裂４２、４２が生じていた（図７
（ｂ））。Further, similarly to the case of a straight pile, when a ready-made concrete pile 36 having a node is used,
Cracks 42 were also formed not only on the bottom surface 37 but also on the outer peripheral edges of the joints 38, 38 (FIG. 7).
(B)).
【０００７】従って、必要な強度を満たすためには、既
製コンクリート杭３６の口径を必要以上に大きくしなけ
ればならず、費用的・工期的に無駄が生じる問題点があ
った。Therefore, in order to satisfy the required strength, the diameter of the ready-made concrete pile 36 must be made larger than necessary, and there is a problem that waste occurs in cost and construction period.
【０００８】また、既製コンクリート杭の下方で、杭穴
のソイルセメント内にリング等を配置する支持力増強方
法も提案されている（特開平７−７６８３０号）が、パ
ンチ破壊やスプリット破壊に対しては所定の効果を奏す
ることができるが、既製コンクリート杭との一体性を図
った発明ではなく、前記のような既製コンクリート杭の
周縁で生じるセメントミルクのせん断力負担の点では十
分でなく、パンチング抜け防止には有効に作用できなか
った。[0008] A method of increasing a supporting force by arranging a ring or the like in soil cement of a pile hole below a ready-made concrete pile has also been proposed (Japanese Patent Laid-Open No. 7-76830). Although it is possible to achieve a predetermined effect, it is not an invention aiming at integration with a ready-made concrete pile, and it is not sufficient in terms of the shearing force burden of cement milk generated at the periphery of the ready-made concrete pile as described above, It could not work effectively to prevent punching through.
【０００９】また、既製杭の先端に鉄筋かごや鋼管を取
り付けた既製杭の提案もなされているが（特開昭６２−
３７４１５号）、既製杭の下方にしか鉄筋かごが位置せ
ず、あるいは、変形し易い鉄筋を使用したり、各鉄筋相
互の接合が弱かったりして、鉄筋かご自身が変形し易い
構造のため、パンチング抜け防止には有効に作用でき
ず、既製杭と杭穴内のセメントミルク類とが一体となっ
た基礎杭構造は得られず、たかだか杭の最下端面の面積
分の耐荷重強度しか得られなかった。[0009] There has also been proposed a ready-made pile in which a reinforcing basket or a steel pipe is attached to the tip of the ready-made pile (Japanese Patent Laid-Open No. Sho 62-62).
No. 37415), because the rebar cage is located only below the ready-made pile, or the rebar which is easily deformed is used because the rebar is weakly connected and the rebar cage itself is easily deformed. It does not work effectively to prevent punching through, so a foundation pile structure in which the ready-made pile and the cement milk in the pile hole are not integrated is obtained, and only the load-bearing strength of the area of the lowest end face of the pile is obtained. Did not.
【００１０】[0010]
【課題を解決するための手段】然るにこの発明は、既製
コンクリート杭本体の下端部外壁に既製コンクリート杭
の外径より大径の外径を有する鉄筋かごを嵌装したの
で、前記問題点を解決した。However, the present invention solves the above-mentioned problem by fitting a steel cage having an outer diameter larger than the outer diameter of the ready-made concrete pile on the outer wall at the lower end of the ready-made concrete pile body. did.
【００１１】即ちこの発明は、既製コンクリート杭本体
の下端部外壁に、前記既製コンクリート杭本体の外径よ
り大径の外径を有する保形された鉄筋かごを、水平垂直
方向の移動を拘束して嵌装係止し又は連結して取り付け
たことを特徴とする下端部に鉄筋かごを設けた既製コン
クリート杭である。また、前記において、鉄筋かごは既
製コンクリート杭本体の下端部外周を覆うと共に、前記
鉄筋かごの下端は、既製コンクリート杭本体の下端より
も所定長さ下方に突出させた既製コンクリート杭であ
る。また、前記において、既製コンクリート杭本体を節
部を有する構造とし、１の節部又は上下に位置する異な
る節部に鉄筋かごを嵌装係止して、前記鉄筋かごを前記
既製コンクリート杭本体に水平垂直方向の移動を拘束し
て一体に取り付けたことを特徴とする既製コンクリート
杭である。That is, according to the present invention, a shape-retained reinforcing cage having an outer diameter larger than the outer diameter of the ready-made concrete pile body is restrained on the outer wall at the lower end portion of the ready-made concrete pile body by restricting horizontal and vertical movement. It is a ready-made concrete pile provided with a reinforcing cage at its lower end, which is fitted and locked or connected and attached. Further, in the above description, the reinforcing cage covers the outer periphery of the lower end portion of the ready-made concrete pile main body, and the lower end of the reinforcing steel cage is a ready-made concrete pile projecting a predetermined length below the lower end of the ready-made concrete pile main body. Further, in the above, the ready-made concrete pile main body has a structure having a knot portion, and a reinforcing bar cage is fitted and locked to one knot portion or a different knot portion located above and below, and the reinforcing bar cage is attached to the ready-made concrete pile main body. A ready-made concrete pile characterized by being attached integrally while restraining horizontal and vertical movements.
【００１２】また、鉄筋かごの発明は、取付け予定の既
製コンクリート杭より大径の平面円周上に略等間隔で、
縦に配置した縦鉄筋に内接又は外接して、所定ピッチで
配置した螺旋鉄筋または所定間隔で上下に並列したリン
グ状鉄筋群を固定してかご本体を形成し、該かご本体の
上部内側は前記既製コンクリート杭を嵌挿できる空間部
を有し、前記かご本体に、前記既製コンクリート杭に取
り付ける為の取付鉄筋を固着したことを特徴とする鉄筋
かごである。また、かご本体をコンクリート内で変形し
ない保形された形状としたことを特徴とする鉄筋かごで
ある。Further, the invention of a reinforcing cage is provided at substantially equal intervals on a plane circumference having a larger diameter than a ready-made concrete pile to be mounted.
A car body is formed by inscribing or circumscribing a vertically arranged vertical reinforcing bar, and fixing a spiral reinforcing bar arranged at a predetermined pitch or a ring-shaped reinforcing bar group vertically arranged at a predetermined interval. A reinforcing bar cage having a space in which the ready-made concrete pile can be inserted, and a reinforcing bar for attaching the ready-made concrete pile to the car body. Further, there is provided a rebar cage wherein the car body has a shape which is not deformed in concrete and is kept in a shape.
【００１３】また、基礎杭構造の発明は、セメントミル
クが充填された杭穴内に既製コンクリート杭を埋設して
なる杭構造において、前記既製コンクリート杭の下端部
外周に保形された鉄筋かごを、水平垂直方向の移動を拘
束して一体に嵌装固定し、該鉄筋かごを拡底掘削した杭
穴の拡底部に位置させたことを特徴とする基礎杭構造で
ある。前記において、既製コンクリート杭を上下に並列
した節部を有する構造とし、少なくとも下端に位置する
節部を覆うように、鉄筋かごを嵌装固定した基礎杭構造
である。[0013] Further, the invention of the foundation pile structure is a pile structure in which a ready-made concrete pile is buried in a pile hole filled with cement milk. A foundation pile structure characterized in that horizontal and vertical movements are restrained to be fitted and fixed integrally, and the rebar cage is positioned at an enlarged bottom portion of a pile hole excavated. In the above, there is provided a foundation pile structure in which a ready-made concrete pile has a node portion vertically arranged in parallel, and a reinforcing steel cage is fitted and fixed so as to cover at least the node portion located at the lower end.
【００１４】また、基礎杭の構築方法の発明は、既製コ
ンクリート杭を杭穴内に埋設して基礎杭を構築する方法
であって、上下に並列した節部を有する既製コンクリー
ト杭の下端部であって、下端に位置する節部を含む位置
に、前記既製コンクリート杭の外周面及び下端面を覆う
ことができる、保形された鉄筋かごを、水平垂直方向の
移動を拘束して予め嵌挿係止して一体に取り付け、次に
前記既製コンクリート杭を、セメントミルクを注入しな
がらあるいはセメントミルクを注入した杭穴内に、埋設
することを特徴とする基礎杭の構築方法である。Further, the invention of a method for constructing a foundation pile is a method for constructing a foundation pile by embedding a ready-made concrete pile in a pile hole. The shape-retained reinforcing cage capable of covering the outer peripheral surface and the lower end surface of the ready-made concrete pile at a position including the joint located at the lower end is inserted in advance by engaging horizontal and vertical movements while restricting the movement. A method of constructing a foundation pile, characterized in that the concrete pile is stopped and integrally attached, and then the ready-made concrete pile is buried while injecting cement milk or in a pile hole into which cement milk is injected.
【００１５】[0015]
【実施の態様】取付け予定の既製コンクリート杭本体よ
り大径の平面円周上に等間隔で、縦に配置した縦鉄筋に
内接して、所定ピッチで配置した上下に並列したリング
状鉄筋群を固着して、保形され変形しない、かご本体と
する。かご本体を既製コンクリート杭本体の下端部外周
を覆うように、嵌装する。かご本体に、既製コンクリー
ト杭本体を挟持するように、リング状鉄筋に対して弦状
の取付鉄筋を固着して、かご本体を既製コンクリート杭
本体に、水平垂直方向の移動を拘束して固定し、既製コ
ンクリート杭を構成する。かご本体と取付鉄筋とで鉄筋
かごを構成する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A ring-shaped reinforcing bar group arranged vertically at a predetermined pitch is inscribed in a vertical reinforcing bar arranged at equal intervals on a plane circumference having a larger diameter than a ready-made concrete pile body to be mounted. It is a car body that sticks, keeps its shape and does not deform. The car body is fitted so as to cover the outer periphery of the lower end of the ready-made concrete pile body. A string-shaped mounting reinforcing bar is fixed to the ring-shaped reinforcing bar so that the ready-made concrete pile main body is sandwiched between the cage main body and the cage main body is fixed to the ready-made concrete pile main body by restraining horizontal and vertical movement. , Constitute a ready-made concrete pile. A reinforced car is constituted by the car body and the mounting rebar.
【００１６】次に、拡底掘削した杭穴内に、セメントミ
ルクを充填すると共に、鉄筋かご付の既製コンクリート
杭を、杭穴内に沈設する。セメントミルクが固化すれ
ば、拡底部に鉄筋かごが配置された既製コンクリート杭
を埋設して一体化した基礎杭構造を構築する。従って、
この基礎杭構造の面積に見合う耐荷重強度が得られる。Next, cement milk is filled in the pile hole excavated to the bottom, and a ready-made concrete pile with a reinforcing cage is laid in the pile hole. When the cement milk solidifies, a precast concrete pile with a steel cage placed in the expanded bottom is buried to build an integrated foundation pile structure. Therefore,
The load bearing strength corresponding to the area of the foundation pile structure can be obtained.
【００１７】[0017]
【実施例１】図１〜３、６に基づきこの発明の既製コン
クリート杭及び鉄筋かごの実施例について説明する。Embodiment 1 An embodiment of a ready-made concrete pile and a reinforcing cage of the present invention will be described with reference to FIGS.
【００１８】この発明に使用する既製コンクリート杭本
体１は、軸部２の外径Ｄ1 、節部３、４の外径Ｄ2 に形
成されている。The pre-cast concrete pile body 1 to be used in this invention, the outer diameter D 1 of the shaft portion 2, is formed on the outer diameter D 2 of the knuckles 3,4.
【００１９】径Ｄ3 の円周に沿って、縦鉄筋７、７を等
間隔円周状に配置し、該縦鉄筋７、７の内周に環状鉄筋
８、８を上下に並列して配置し、縦鉄筋７、７と環状鉄
筋８、８とを固着して、かご本体９とする。前記かご本
体９の下部に、取付け予定の既製コンクリート杭本体１
の軸部２を挟むことができるように、井桁状の下取付部
１０を固着する。前記下取付部１０は、井桁状を構成す
る棒状の取付鉄筋１１、１１が、前記環状鉄筋８に対し
て弦状に配置されている。Along the circumference of the diameter D 3 , the vertical reinforcing bars 7, 7 are arranged at equal intervals around the circumference, and annular reinforcing bars 8, 8 are vertically arranged side by side on the inner circumference of the vertical reinforcing bars 7, 7. Then, the vertical reinforcing bars 7 and 7 and the annular reinforcing bars 8 and 8 are fixed to each other to form a car main body 9. At the lower part of the car body 9, the ready-made concrete pile body 1 to be attached
The lower mounting portion 10 is fixed so that the shaft portion 2 can be sandwiched. In the lower mounting portion 10, bar-shaped mounting reinforcing bars 11, 11 forming a cross-girder shape are arranged in a chord shape with respect to the annular reinforcing bar 8.
【００２０】また、前記かご本体９に、取付け予定の既
製コンクリート杭本体１を取り付けた際に、取付け予定
の既製コンクリート杭本体１の底面から所定距離宛て下
方に位置するように、環状鉄筋８に棒状の鉄筋を格子状
に固着してなる補強鉄筋１３を取り付ける（図２、図１
（ｂ））。Further, when the ready-made concrete pile body 1 to be mounted is attached to the car body 9, the annular reinforcing bar 8 is so positioned as to be located a predetermined distance below the bottom surface of the ready-made concrete pile body 1 to be mounted. A reinforcing reinforcing bar 13 in which a bar-shaped reinforcing bar is fixed in a grid shape is attached (FIGS. 2 and 1).
(B)).
【００２１】既製コンクリート杭本体１の下端部１ａ
に、前記鉄筋かご本体９を、下方から嵌装する。この
際、下取付部１０は、既製コンクリート杭本体１の軸部
２に嵌装し、下端に位置する節部４の下縁４ｂに当接す
る。また、かご本体（環状鉄筋８）９の中心に既製コン
クリート杭本体１が位置するように、かご本体９を配置
する。Lower end 1a of ready-made concrete pile body 1
Then, the rebar cage main body 9 is fitted from below. At this time, the lower mounting part 10 is fitted on the shaft part 2 of the ready-made concrete pile main body 1 and abuts on the lower edge 4b of the node part 4 located at the lower end. The car body 9 is arranged so that the ready-made concrete pile body 1 is located at the center of the car body (annular reinforcing bar 8) 9.
【００２２】続いて、前記かご本体９に、前記下端に位
置する節部４の上下縁４ａ、４ｂを挟むように、かつ前
記節部４の上端４ａに当接するように、同様に、取付鉄
筋１１、１１を井桁状に配置して、上取付鉄筋１２とし
て、該上取付部１２を前記かご本体９に固着する。ま
た、前記下端に位置する節部４の、上方に位置する節部
３の下縁３ｂに当接するように、かつ、既製コンクリー
ト杭本体１の軸部２を挟むように、取付鉄筋１１、１１
を井桁状に配置して上取付部１２とし、該上取付部１２
をかご本体９に固着する。Subsequently, the reinforcing rod is similarly mounted on the car body 9 so as to sandwich the upper and lower edges 4a and 4b of the joint 4 located at the lower end and to abut on the upper end 4a of the joint 4. The upper mounting portion 12 is fixed to the car main body 9 as an upper mounting reinforcing bar 12 by arranging 11 and 11 in a cross-girder shape. In addition, the mounting rebars 11, 11 are arranged so as to abut on the lower edge 3 b of the node 3 located above the node 4 located at the lower end and to sandwich the shaft 2 of the precast concrete pile body 1.
Are arranged in a cross-girder shape to form an upper mounting portion 12, and the upper mounting portion 12
To the car body 9.
【００２３】以上のようにして、この発明の鉄筋かご付
の既製コンクリート杭１７を構成する（図１（ａ）
（ｂ））。ここで、かご本体９に井桁状の取付部１０、
１２、補強鉄筋１３を固着した構成からこの発明の鉄筋
かご１４を構成する。As described above, the ready-made concrete pile 17 with the reinforcing cage of the present invention is constructed (FIG. 1 (a)).
(B)). Here, the car body 9 has a double-girder attachment portion 10,
12. The reinforcing cage 14 of the present invention is constituted by the structure in which the reinforcing reinforcing bar 13 is fixed.
【００２４】また、前記において、鉄筋かご１４の下端
１５は、既製コンクリート杭本体１の底面（下端）５よ
りＬ1 だけ下方に突出してある（図１（ａ））。ここ
で、Ｌ 1 は、５０ｃｍ程度としてあるが、既製コンクリ
ート杭本体１に作用する各種荷重を支持地盤に確実に伝
えるべく、支持地盤の性質、セメントミルクの強度、既
製コンクリート杭本体１の径などにより２０〜２００ｃ
ｍの範囲で種々選択する。In the above, the lower end of the reinforcing cage 14
15 is the bottom (lower end) 5 of the ready-made concrete pile body 1
L1 Only downward (FIG. 1 (a)). here
And L 1 Is about 50 cm, but the ready-made concrete
Various loads acting on the pile body 1 are reliably transmitted to the supporting ground.
To improve the properties of the supporting ground, the strength of the cement milk,
20 to 200c depending on the diameter of the concrete pile body 1
Various selections are made in the range of m.
【００２５】また、前記において、鉄筋かご１４の上部
及び中間部は既製コンクリート杭本体１の下端からＬ2
の長さだけ、既製コンクリート杭本体１の外周部を覆っ
ている（図１（ａ））。ここで、Ｌ2 は、少なくとも
最下端に位置する節部４を覆う程度（または節杭・スト
レート杭で、既製コンクリート杭本体１の外径程度）で
あれば、杭穴２１内で、コンクリート杭本体１との構造
的な一体性が図られ、後述する拡底部内のセメントミル
ク２３に生じるせん断力を有効に負担できる。また、Ｌ
2 は、好ましくは節杭では、下端側の節部の２〜３個
分を覆い、あるいは杭径に換算すれば（節杭又はストレ
ート杭で）、既製コンクリート杭本体１の外径の２〜４
倍程度が望ましい。In the above, the upper and middle portions of the reinforcing cage 14 are L 2 from the lower end of the ready-made concrete pile body 1.
(See FIG. 1 (a)). Here, if L 2 is at least an extent covering the node 4 located at the lowermost end (or approximately an outer diameter of the ready-made concrete pile main body 1 with a node pile / straight pile), the concrete pile Structural integrity with the main body 1 is achieved, and a shear force generated in the cement milk 23 in the expanded bottom portion described later can be effectively borne. Also, L
2 is preferably a knotted pile, which covers two to three knots on the lower end side or, when converted to a pile diameter (knotted pile or straight pile), has an outer diameter of 2 to 2 of the ready-made concrete pile main body 1. 4
About double is desirable.
【００２６】また、前記において、鉄筋かご１４は、縦
鉄筋７、７と環状鉄筋８、８とからかご本体９を構成し
ており、鉄筋かご１４自体は伸縮変形せず、保形され
る。Further, in the above description, the rebar cage 14 constitutes the car body 9 from the vertical rebars 7, 7 and the annular rebars 8, 8, and the rebar cage 14 itself is not deformed by expansion and contraction, but is kept in shape.
【００２７】また、前記において、図１（ａ）（ｂ）
（ｃ）に示すように、既製コンクリート杭本体１の下端
に位置する節部４を、上取付部１２、下取付部１０の取
付鉄筋１１、１１で上下から挟んで係止し、かつ、取付
鉄筋１１、１１で、既製コンクリート杭本体１の軸部２
を挟んで、前記鉄筋かご１４は嵌装係止されている。従
って、鉄筋かご１４は、既製コンクリート本体１に対し
て多少の回転は許容されるが、水平方向及び垂直方向に
拘束され、既製コンクリート杭本体１と構造的に一体に
形成される。よって、既製コンクリート杭本体１を上下
方向に作用する応力が作用した場合、取付鉄筋１１、１
１を介して、鉄筋かご１４に直接伝達できる構造となっ
ている。In the above, FIGS. 1 (a) and 1 (b)
As shown in (c), the joint 4 located at the lower end of the ready-made concrete pile main body 1 is interposed between the upper and lower mounting parts 12 and 11, and is locked and attached. The shaft 2 of the ready-made concrete pile body 1 is
, The rebar cage 14 is fitted and locked. Therefore, the rebar cage 14 is allowed to rotate slightly with respect to the ready-made concrete body 1 but is restrained in the horizontal and vertical directions, and is structurally formed integrally with the ready-made concrete pile body 1. Therefore, when a stress acting on the ready-made concrete pile main body 1 in the vertical direction acts, the mounting reinforcing bars 11, 1
1 and can be directly transmitted to the reinforcing cage 14.
【００２８】また、前記において、既製コンクリート杭
本体１に鉄筋かご１４を嵌装係止する際に、節部４
（３）が案内となって、節部４に取付鉄筋１１、１１で
挟んで取付けることができるので、取り付けるべき位置
に正確に容易に設定することができる。従って、予め工
場で鉄筋かご１４をコンクリート杭本体１に取付ること
はもちろん、施工現場で鉄筋かご１４を取付ける際に
も、作業性が良く、正確な位置に嵌装係止して固定する
ことができる。In the above, when the reinforcing steel cage 14 is fitted to the ready-made concrete pile main body 1 and locked, the joint 4
(3) serves as a guide, and can be attached to the joint portion 4 with the attachment reinforcing bars 11, 11, so that the position to be attached can be accurately and easily set. Therefore, not only is the steel cage 14 attached to the concrete pile body 1 at the factory in advance, but also when the steel cage 14 is installed at the construction site, workability is good, and it is necessary to fit and lock it at an accurate position and fix it. Can be.
【００２９】次に、前記実施例の鉄筋かご付きの既製コ
ンクリート杭１７の使用、即ちこの発明の基礎杭の施工
方法及び基礎杭構造について説明する。Next, the use of the ready-made concrete pile 17 with a reinforcing cage of the above embodiment, that is, the method of constructing the foundation pile of the present invention and the foundation pile structure will be described.
【００３０】通常の方法により、「軸部１９の口径Ｄ
4 、拡底部２０の口径Ｄ5 」の杭穴２１を掘削する。続
いて、通常の既製コンクリート杭本体１に対応した杭打
ち機に、この発明の既製コンクリート杭１７を装着し
て、予めセメントミルク２３が充填されたあるいはセメ
ントミルク２３を充填しながら、既製コンクリート杭１
７を杭穴２１内に沈設する。前記におけるセメントミル
クは、支持地盤の強度に応じて調整するが、固化強度１
００〜４００ｋｇ／ｃｍ2 程度とする。According to the usual method, the "diameter D of the shaft portion 19
4. Excavate the pile hole 21 having the diameter D 5 of the expanded bottom 20. Subsequently, the ready-made concrete pile 17 of the present invention is mounted on a pile driving machine corresponding to the ordinary ready-made concrete pile main body 1, and the pre-filled concrete pile 17 is filled with the cement milk 23 or filled with the cement milk 23 in advance. 1
7 is sunk in the pile hole 21. The cement milk in the above is adjusted according to the strength of the supporting ground, but has a solidification strength of 1
It is set to about 00 to 400 kg / cm 2 .
【００３１】この際、鉄筋かご１４の外径Ｄ3 は、杭穴
２１の軸部１９の口径Ｄ4 と同径又は小さい径で形成し
てあるので、既製コンクリート杭１７の下降に際して鉄
筋かご１４が邪魔になることはない。また、鉄筋かご１
４が、杭穴２１の軸部１９の穴壁に沿って既製コンクリ
ート杭１７が沈設されるので、既製コンクリート杭１７
を杭穴２１の芯に案内できる（図１（ｃ））。At this time, since the outer diameter D 3 of the reinforcing cage 14 is formed to be the same as or smaller than the diameter D 4 of the shaft portion 19 of the pile hole 21, the lower reinforcing cage 14 is lowered when the ready-made concrete pile 17 is lowered. Is not in the way. In addition, rebar basket 1
4, the ready-made concrete pile 17 is laid down along the hole wall of the shaft portion 19 of the pile hole 21.
Can be guided to the core of the pile hole 21 (FIG. 1C).
【００３２】沈設された既製コンクリート杭１７は、鉄
筋かご１４が杭穴２１の拡底部２０内に位置して、かつ
鉄筋かご１４が杭穴２１の底２２に載置された状態にな
る。また、鉄筋かごの周囲には、少なくとも杭穴の拡底
径分だけのセメントミルクの「かぶり」が形成されるの
で、鉄筋かご１４を保護できる。The laid concrete pile 17 is in a state where the reinforcing cage 14 is located in the enlarged bottom portion 20 of the pile hole 21 and the reinforcing cage 14 is placed on the bottom 22 of the pile hole 21. In addition, since the “fogging” of the cement milk is formed around the reinforcing bar at least by the diameter of the enlarged bottom of the pile hole, the reinforcing bar 14 can be protected.
【００３３】以上のようにして、既製コンクリート杭１
７を沈設すると共に、セメントミルク２３が固化後に、
この発明の基礎杭構造２５を構成する（図１（ｃ））。As described above, the ready-made concrete pile 1
7, and after the cement milk 23 has solidified,
The foundation pile structure 25 of the present invention is configured (FIG. 1C).
【００３４】また、前記において使用する既製コンクリ
ート杭本体１の軸部２ 外径Ｄ1 ＝６０ｃｍ 程度とし
た場合、例えば、 既製コンクリート杭本体１の節部３、４ 外径Ｄ2 ＝７０〜９０ｃｍ程度 掘削する杭穴２１の軸部１９ 口径Ｄ4 ＝８０〜１２０ｃｍ程度 掘削する杭穴２１の拡底部２０ 口径Ｄ5 ＝１００〜１６０ｃｍ程度 とする。Further, when the shaft portion 2 outer diameter D 1 = 60cm approximately prefabricated concrete pile body 1 to be used in the, for example, burls 3,4 outside diameter of the pre-cast concrete pile body 1 D 2 = 70~90cm Depth Shaft part 19 of pile hole 21 to be excavated Diameter D 4 = about 80 to 120 cm Enlarged bottom part 20 of pile hole 21 to be excavated Diameter D 5 = about 100 to 160 cm.
【００３５】前記実施例により施工された基礎杭構造２
５は、鉄筋かご１４が構造体として、杭穴２１の拡底部
２０内の固化したセメントミルク２３を補強し、セメン
トミルク２３と既製コンクリート杭本体１との一体性を
確保できる。鉄筋かごが、杭下端部を強固に覆い、コン
クリートと一体化しているために、かご面積分の強度が
発現できている。The foundation pile structure 2 constructed according to the above embodiment
5, the reinforcing cage 14 serves as a structure to reinforce the solidified cement milk 23 in the expanded bottom portion 20 of the pile hole 21, and to ensure the integrity of the cement milk 23 and the ready-made concrete pile main body 1. Since the reinforcing steel cage firmly covers the lower end of the pile and is integrated with concrete, the strength corresponding to the area of the cage can be realized.
【００３６】また、基礎杭構造２５に、パンチング抜け
を発生させるような垂直荷重が作用した場合、これに対
抗して、鉄筋かご１４の縦鉄筋７、環状鉄筋８、井桁状
の取付鉄筋１１、１１、格子状の補強鉄筋１３等によ
り、拡底部２０内のセメントミルク２３に生じるせん断
力を負担できる。取り分け、既製コンクリート杭本体１
の外周縁では、井桁状の取付鉄筋１１、補強鉄筋１３の
格子状の鉄筋等により補強される。従って、従来のよう
に、既製コンクリート杭本体１の周縁で生じる亀裂２４
ａ、２４ａはもとより、鉄筋かご１４を強化すれば、鉄
筋かご１４の周縁で発生する亀裂２４、２４の発生をも
防止できる（図３）。When a vertical load causing punching-out is applied to the foundation pile structure 25, the vertical reinforcing bar 7, the ring-shaped reinforcing bar 8, the cross-bar-shaped mounting reinforcing bar 11 of the reinforcing bar 14 are opposed to the vertical load. 11, the shearing force generated in the cement milk 23 in the expanded bottom portion 20 can be borne by the lattice-shaped reinforcing reinforcing bar 13 and the like. In particular, ready-made concrete pile body 1
Is reinforced by a grid-shaped reinforcing bar of the reinforcing steel bars 13 and the like. Therefore, as in the conventional case, the crack 24 generated at the periphery of the ready-made concrete pile main body 1 is formed.
If the reinforcing bars 14a are strengthened as well as the reinforcing bars 14a and 24a, it is possible to prevent the occurrence of cracks 24, 24 generated at the periphery of the reinforcing bar cage 14 (FIG. 3).
【００３７】また、過度の荷重によりたとえ亀裂が生じ
る場合であっても、亀裂２４、２４は、鉄筋かご１４の
外周縁から生じ、亀裂２４、２４発生後においても、杭
穴の拡底部２０の口径Ｄ5 に相当する外径の既製コンク
リート杭としての強度を発揮できる（図３）。Further, even if a crack is caused by an excessive load, the cracks 24, 24 are formed from the outer peripheral edge of the reinforcing cage 14, and even after the cracks 24, 24 are formed, the enlarged bottom portion 20 of the pile hole is formed. the strength of the pre-cast concrete pile with an outer diameter corresponding to the diameter D 5 can be exhibited (Figure 3).
【００３８】即ち、杭穴２１の拡底部２０（拡底根固め
部）の固化したセメントミルクの面積は、拡底部２０の
外径Ｄ5 比の２乗に比例して大きくなり、それに見合っ
た節部３、４を有する既製コンクリート杭１７の耐垂直
荷重が従来に比べ２〜５倍に大きくなる。また、節部
３、４を有する既製コンクリート杭１７では、既製コン
クリート杭１７に作用する垂直荷重が節部３、４に係止
した上下取付部１０、１２の取付鉄筋１１、１１を通し
て、鉄筋かご１４に直接に伝達されるので、より確実に
安定した高い垂直荷重に耐えうる基礎杭構造が形成でき
る。That is, the area of the solidified cement milk at the expanded portion 20 (the expanded root compaction portion) of the pile hole 21 increases in proportion to the square of the ratio of the outer diameter D 5 of the expanded portion 20 to a node corresponding thereto. The vertical load resistance of the ready-made concrete pile 17 having the portions 3 and 4 is increased by 2 to 5 times as compared with the related art. Further, in the ready-made concrete pile 17 having the nodes 3 and 4, the vertical load acting on the ready-made concrete pile 17 passes through the reinforcing bars 11 and 11 of the upper and lower mounting portions 10 and 12 locked on the nodes 3 and 4 and the reinforcing cage. Since it is directly transmitted to the base 14, a foundation pile structure that can withstand a high vertical load that is more stable and stable can be formed.
【００３９】前記実施例において、鉄筋かご１４の取付
に際して、下端に位置する節部４の下縁４ｂを下取付部
１０の取付鉄筋１１、１１を当接して、節部４の上縁４
ａ及び節部３の下縁３ｂに、上取付部１２の取付鉄筋１
１、１１を当接して、挟んで係止したが、鉄筋かご１４
の上下の動きを拘束できれば良いので、節部３の下縁３
ｂへの上取付部１２の取付鉄筋１１、１１は省略するこ
ともできる（図示していない）。また、節部４の上縁４
ａ及び節部３の下縁３ｂへの取付鉄筋１１、１１の配置
に代え、節部４の上縁３ａにのみ上取付部１２の取付鉄
筋１１、１１を配置することもできる（図示していな
い）。In the above embodiment, when the reinforcing bar cage 14 is mounted, the lower edge 4b of the node 4 located at the lower end is brought into contact with the mounting rebars 11, 11 of the lower mounting portion 10, and the upper edge 4 of the node 4
a on the lower edge 3b of the joint 3
1 and 11 were abutted and sandwiched and locked.
The lower edge 3 of the joint 3
The reinforcing bars 11, 11 of the upper mounting portion 12 to b can be omitted (not shown). Also, the upper edge 4 of the node 4
Instead of the arrangement of the reinforcing bars 11, 11 on the lower edge 3 b of the node 3, the mounting bars 11, 11 of the upper mounting portion 12 can be arranged only on the upper edge 3 a of the node 4 (shown in the figure). Absent).
【００４０】また、前記実施例の鉄筋かご１４の構成に
おいて、縦鉄筋７と環状鉄筋８とを固着して、かご本体
９としたが、環状鉄筋８、８に代えて、連続した又は断
続した螺旋鉄筋を使用することもできる（図示していな
い）。また、前記縦鉄筋７、７に内接して環状鉄筋８、
８を固着したが、従来の他の鉄筋かごにあるように、縦
鉄筋７、７に外接して環状鉄筋８、８を固着することも
できる（図示していない）。Further, in the configuration of the reinforcing cage 14 of the above embodiment, the vertical reinforcing bar 7 and the annular reinforcing bar 8 are fixed to each other to form the car body 9, but instead of the annular reinforcing bars 8, 8 are connected continuously or intermittently. Spiral rebar can also be used (not shown). Further, an annular reinforcing bar 8, inscribed in the vertical reinforcing bars 7, 7,
Although the fixing bars 8 are fixed, the annular reinforcing bars 8, 8 can be fixed to the vertical reinforcing bars 7, 7 by circumscribing them, as in other conventional reinforcing bars (not shown).
【００４１】また、前記実施例の鉄筋かご１４の構成に
おいて、井桁状の上下取付部１０、１２を使用したが、
既製コンクリート杭１７の沈設時から杭穴２１内のセメ
ントミルク２３の固化までの間、既製コンクリート杭本
体１と鉄筋かご１４との位置がずれなければ（回転は許
容）、他の構造とすることもできる。例えば、上下取付
部１０、１２は、３本あるいは５本以上の棒状の取付鉄
筋１１、１１を既製コンクリート杭本体１の軸部２に沿
って環状鉄筋８の弦状に配置して構成することもできる
（図６（ａ）（ｂ））。Further, in the configuration of the reinforcing cage 14 of the above embodiment, the upper and lower mounting portions 10 and 12 in the shape of a girder are used.
If the position of the precast concrete pile main body 1 and the reinforced basket 14 is not displaced (allowing rotation) between the time when the ready-cast concrete pile 17 is laid and the time when the cement milk 23 in the pile hole 21 is solidified, use another structure. Can also. For example, the upper and lower mounting portions 10 and 12 are configured by arranging three or five or more bar-shaped mounting reinforcing bars 11 and 11 in a chord shape of the annular reinforcing bar 8 along the shaft portion 2 of the ready-made concrete pile main body 1. (FIGS. 6A and 6B).
【００４２】また、環状鉄筋８の内周に既製コンクリー
ト杭本体１の軸部が挿通できる環状の取付鉄筋１６を配
置して、環状鉄筋８と固着して、下取付部１０とするこ
ともできる（図６（ｃ））。また、軸部２の外径に応じ
た半円等の部分円状の取付鉄筋１１、１１をかご本体９
に固定して上下取付部１０、１２とすることもできる
（図６（ｄ））。また、かご本体９と既製コンクリート
杭本体１の端板とに適当な鉄筋片（取付鉄筋）を固着し
て、かご本体９を既製コンクリート杭本体１に取り付け
ることもできる（図示していない）。Further, an annular mounting reinforcing bar 16 through which the shaft of the ready-made concrete pile main body 1 can be inserted is arranged on the inner periphery of the annular reinforcing bar 8, and is fixed to the annular reinforcing bar 8 to form the lower mounting portion 10. (FIG. 6 (c)). Further, the car main body 9 is provided with a partially circular mounting reinforcing bar 11, such as a semicircle, corresponding to the outer diameter of the shaft 2.
And the upper and lower mounting portions 10 and 12 (FIG. 6D). Further, an appropriate reinforcing bar piece (attachment reinforcing bar) may be fixed to the car body 9 and the end plate of the ready-made concrete pile main body 1 to attach the car main body 9 to the ready-made concrete pile main body 1 (not shown).
【００４３】[0043]
【実施例２】図４、５、６に基づきこの発明の他の実施
例を説明する。Embodiment 2 Another embodiment of the present invention will be described with reference to FIGS.
【００４４】この発明の既製コンクリート杭１は、軸部
２が外径Ｄ0 に形成されている。The pre-cast concrete pile 1 of the present invention, the shaft portion 2 is formed on the outer diameter D 0.
【００４５】実施例１と同様に、径Ｄ3 の円周に沿っ
て、縦鉄筋７、７を等間隔円周状に配置し、該縦鉄筋
７、７の内周に環状鉄筋８、８を上下に並列して配置
し、縦鉄筋７、７と環状鉄筋８、８とを固着して、かご
本体９とする。As in the first embodiment, the vertical reinforcing bars 7, 7 are arranged at equal intervals along the circumference of the diameter D 3 , and annular reinforcing bars 8, 8 are provided on the inner periphery of the vertical reinforcing bars 7, 7. Are arranged side by side up and down, and the vertical reinforcing bars 7 and 7 and the annular reinforcing bars 8 and 8 are fixed to form a car main body 9.
【００４６】前記かご本体９に、取付け予定の既製コン
クリート杭本体１の軸部２を挟むことができるように、
井桁状の取付部２６、２６を夫々固着する。前記取付部
２６は、井桁状を構成する棒状の取付鉄筋１１、１１
が、環状鉄筋８に対して弦状に配置されている。また、
前記かご本体９の環状鉄筋８で、取付け予定の既製コン
クリート杭本体１の底面から所定距離宛て下方に位置す
るように、棒状の鉄筋を格子状に固着してなる補強鉄筋
１３を取り付ける（図２、図４（ｂ））。また、最下端
の取付部２６に、取付け予定の既製コンクリート杭本体
１の下端板２８に当接できる縦取付鉄筋（短い棒状の鉄
筋）２９、２９を固着して、この発明の鉄筋かご３０を
構成する。In order that the shaft portion 2 of the ready-made concrete pile body 1 to be attached can be sandwiched between the car body 9 and
The cross-girder attachment portions 26 are fixedly attached. The mounting portion 26 includes a bar-shaped mounting rebar 11, 11
Are arranged chordally with respect to the annular reinforcing bar 8. Also,
A reinforcing reinforcing bar 13 in which bar-shaped reinforcing bars are fixed in a grid pattern is attached to the annular reinforcing bar 8 of the car main body 9 so as to be located at a predetermined distance below the bottom surface of the ready-made concrete pile main body 1 to be mounted (FIG. 2). 4 (b)). In addition, vertically mounted reinforcing bars (short bar-shaped reinforcing bars) 29, 29 capable of abutting on the lower end plate 28 of the ready-made concrete pile main body 1 to be mounted are fixed to the lowermost mounting portion 26, and the reinforcing steel basket 30 of the present invention is fixed. Constitute.
【００４７】既製コンクリート杭本体１の下端部１ａ
に、鉄筋かご３０の芯に既製コンクリート杭本体１の芯
が位置するように、前記鉄筋かご３０を下方から嵌装し
て、縦取付鉄筋２９、２９の先端部を、既製コンクリー
ト杭本体１の下端板２８に固着する。ここで、取付鉄筋
１１、１１により鉄筋かご３０のぶれが防止され、取付
鉄筋２９、２９により鉄筋かご３０の水平方向及び垂直
方向の移動が規制され、前記実施例１の鉄筋かご１４、
既製コンクリート杭１７と同様に、鉄筋かご３０は既製
コンクリート杭本体１に嵌装係止して、構造的に一体に
固定される。The lower end 1a of the ready-made concrete pile body 1
Then, the reinforcing steel cage 30 is fitted from below so that the core of the ready-made concrete pile main body 1 is positioned at the core of the reinforcing steel cage 30, and the end portions of the vertical mounting reinforcing bars 29, 29 are attached to the pre-cast concrete pile main body 1. It is fixed to the lower end plate 28. At this point, the mounting rebars 11 and 11 prevent the rebar cage 30 from being shaken, and the mounting rebars 29 and 29 restrict the horizontal and vertical movement of the rebar cage 30.
Similar to the ready-made concrete pile 17, the reinforcing steel cage 30 is fitted and locked to the ready-made concrete pile main body 1 and is structurally fixed integrally.
【００４８】以上のようにして、この発明の鉄筋かご付
の既製コンクリート杭３２を構成する。前記において、
鉄筋かご３０の下端３１は、既製コンクリート杭本体１
の底面（下端）５よりＬ1 だけ下方に突出してある。As described above, the ready-made concrete pile 32 with the reinforcing cage of the present invention is constructed. In the above,
The lower end 31 of the reinforced basket 30 is the ready-made concrete pile body 1
From only L 1 of the bottom surface (lower end) 5 are protruded downward.
【００４９】次に、前記実施例の鉄筋かご付きの既製コ
ンクリート杭３２の使用について説明する。実施例１と
同様に、通常の方法により、「軸部１９の口径Ｄ4 、拡
底部２０の口径Ｄ5 」で杭穴２１を掘削する。続いて、
この発明の既製コンクリート杭３２を、予めセメントミ
ルク２３が充填されたあるいはセメントミルク２３を充
填しながら、杭穴２１内に沈設する。Next, the use of the ready-made concrete pile 32 with a reinforcing cage of the above embodiment will be described. As in Example 1, by a conventional method, drilling Kuiana 21 "diameter D 4 of the shaft portion 19, the diameter D 5 of拡底portion 20". continue,
The ready-made concrete pile 32 of the present invention is sunk in the pile hole 21 while being previously filled with the cement milk 23 or while being filled with the cement milk 23.
【００５０】この際、実施例１と同様に、鉄筋かご３０
の外径Ｄ3 は杭穴の軸部口径Ｄ4 と同径又は小さい径で
形成してあるので、既製コンクリート杭３２の下降に際
して、鉄筋かご３０が邪魔になることはく、また、鉄筋
かご３０を案内として、既製コンクリート杭３２を杭穴
２１の芯に沈設できる。沈設された既製コンクリート杭
は、鉄筋かご３０が拡底部２０内に位置して、鉄筋かご
３０が杭穴２１の底２２に載置された状態の基礎杭構造
３３を構成する（図４（ｃ））。At this time, as in the first embodiment,
Since the outer diameter D 3 of the same diameter or a shank diameter D 4 of Kuiana is formed with a small diameter, upon the descent of the pre-cast concrete piles 32, it is Ku the rebar cage 30 gets in the way, also, rebar cage By using 30 as a guide, the ready-made concrete pile 32 can be laid in the core of the pile hole 21. The sunk ready-made concrete pile constitutes a foundation pile structure 33 in a state in which the reinforcing cage 30 is located in the enlarged bottom portion 20 and the reinforcing cage 30 is placed on the bottom 22 of the pile hole 21 (FIG. 4 (c)). )).
【００５１】前記実施例１と同様に、基礎杭構造３３は
鉄筋かご３０により拡底部２０内のセメントミルク２３
を補強して、セメントミルク２３と既製コンクリート杭
本体１との一体性を確保できる。また、鉄筋かごが、杭
下端部を強固に覆い、コンクリートと一体化しているた
めに、かご面積分の強度が発現できている。従って、実
施例１と同様に、基礎杭構造３３に垂直荷重が作用した
場合であっても、既製コンクリート杭本体１の外周縁の
セメントミルク２３における亀裂２４ａの発生はもとよ
り、鉄筋かご３０の周縁で発生する亀裂２４、２４をも
防止できる（図５）。In the same manner as in the first embodiment, the foundation pile structure 33 is provided with the reinforcing milk
And the cement milk 23 and the ready-made concrete pile main body 1 can be integrated. In addition, since the reinforcing cage strongly covers the lower end of the pile and is integrated with concrete, the strength corresponding to the cage area can be realized. Therefore, similarly to the first embodiment, even when a vertical load is applied to the foundation pile structure 33, not only the generation of cracks 24a in the cement milk 23 on the outer peripheral edge of the ready-made concrete pile main body 1 but also the peripheral edge of the reinforcing steel cage 30 is performed. The cracks 24, 24 generated in the step can also be prevented (FIG. 5).
【００５２】前記実施例の鉄筋かご３０の構成におい
て、鉄筋かご３０と既製コンクリート杭本体１との固定
を縦取付鉄筋２９を使用したが、既製コンクリート杭３
２の沈設時から杭穴２１内のセメントミルク２３の固化
までの間、既製コンクリート杭本体１と鉄筋かご３０と
の位置がずれなければ（回転は許容）、他の構造とする
こともできる。例えば、前記取付鉄筋１１と同様に、水
平棒状の取付鉄筋を既製コンクリート杭本体１の底面位
置に合わせて、かご本体９に固着することもできる（図
示していない）。この場合には、水平棒状の取付鉄筋を
既製コンクリート杭本体１の下端板２８に固着する。In the configuration of the reinforcing steel cage 30 of the above embodiment, the vertical mounting reinforcing steel 29 is used to fix the reinforcing steel cage 30 to the precast concrete pile main body 1.
If the position of the ready-made concrete pile main body 1 and the reinforced car 30 is not shifted (rotation is allowed) between the time of the setting of 2 and the time when the cement milk 23 in the pile hole 21 is solidified, another structure can be adopted. For example, similarly to the mounting rebar 11, a horizontal bar-shaped mounting rebar can be fixed to the car main body 9 in accordance with the bottom surface position of the ready-made concrete pile main body 1 (not shown). In this case, a horizontal bar-shaped mounting rebar is fixed to the lower end plate 28 of the ready-made concrete pile main body 1.
【００５３】また、前記実施例の鉄筋かご３０の構成に
おいて、井桁状の取付部２６に代わる他の取付部２６の
構成は、前記実施例１の取付部１０、１２の他の構成と
同様である（図６（ａ）〜（ｄ））。また、その他の鉄
筋かご３０の構成も前記実施例１の鉄筋かご１４の構成
と同様である。Further, in the configuration of the rebar cage 30 of the above-described embodiment, the configuration of another mounting portion 26 instead of the cross-girder-shaped mounting portion 26 is the same as the other configurations of the mounting portions 10 and 12 of the first embodiment. (FIGS. 6A to 6D). Further, the configuration of the other rebar cage 30 is the same as the configuration of the rebar cage 14 of the first embodiment.
【００５４】更に、既製コンクリート杭本体１の軸部を
挿通できる環状の取付鉄筋１６を、平面で前記かご本体
９の環状鉄筋８の中心に配置して、該環状鉄筋１６を、
放射状の取付鉄筋３４、３４で、かご本体９に固着する
こともできる（図６（ｅ））。この場合には、取付鉄筋
３４、３４の内端が既製コンクリート杭本体１の外面に
押圧され、あるいは、取付鉄筋３４、３４の内端を既製
コンクリート杭本体１の下端板２８に固着して、鉄筋か
ご３０を既製コンクリート杭本体１に取り付ける。Further, an annular mounting reinforcing bar 16 through which the shaft portion of the ready-made concrete pile main body 1 can be inserted is disposed at the center of the annular reinforcing bar 8 of the car body 9 in a plane, and the annular reinforcing bar 16 is
The radial mounting rebars 34, 34 can also be fixed to the car body 9 (FIG. 6 (e)). In this case, the inner ends of the mounting reinforcing bars 34, 34 are pressed against the outer surface of the ready-made concrete pile main body 1, or the inner ends of the mounting reinforcing bars 34, 34 are fixed to the lower end plate 28 of the ready-made concrete pile main body 1, The reinforcing steel basket 30 is attached to the ready-made concrete pile main body 1.
【００５５】[0055]
【発明の効果】この発明は、既製コンクリート杭の下端
部外周に鉄筋かごを嵌装係止して固定したので、埋設し
た既製コンクリート杭の鉄筋かご、即ち基礎杭構造は、
杭穴内のセメントミルクを補強できる。従って、既製コ
ンクリート杭に大きな垂直荷重が作用した場合であって
も、既製コンクリート杭の下端部では、鉄筋かごに沿っ
てせん断力が伝搬して、杭穴内のセメントミルクに亀裂
が発生することを防止できる。よって、固化したセメン
トミルクの外径に応じた既製コンクリート杭としての機
能を発揮できる。According to the present invention, since a reinforcing steel cage is fitted and locked on the outer periphery of the lower end portion of the ready-made concrete pile, the reinforcing concrete cage of the buried ready-made concrete pile, that is, the foundation pile structure,
Reinforce cement milk in pile holes. Therefore, even when a large vertical load is applied to the ready-made concrete pile, at the lower end of the ready-made concrete pile, the shear force propagates along the reinforcing cage and cracks occur in the cement milk in the pile hole. Can be prevented. Therefore, the function as a ready-made concrete pile according to the outer diameter of the solidified cement milk can be exhibited.
【００５６】とりわけ、節部を有する既製コンクリート
杭を使用した場合には、節部の上下縁を利用し、鉄筋か
ごが一体に固定された既製コンクリート杭を構築できる
ので、杭穴拡底部の固化したセメントミルクは既製杭の
下端部と一体に作用するので、既製コンクリート杭１７
の耐垂直荷重は、杭穴拡底部の面積に比例した量とし
て、従来に比べ２〜５倍に大きくできる効果がある。ま
た、既製コンクリート杭に作用する垂直荷重が節部か
ら、鉄筋かごの上下取付部を通して、鉄筋かごに直接に
伝達されるので、より確実に安定した高い垂直荷重に耐
えうる基礎杭構造が形成できる効果がある。In particular, when a ready-made concrete pile having a knot is used, the upper and lower edges of the knot can be used to construct a ready-made concrete pile in which a reinforcing steel cage is integrally fixed. Since the cement milk that has worked acts integrally with the lower end of the ready-made pile, the ready-mixed concrete pile 17
Has an effect that it can be increased by 2 to 5 times as compared with the related art as an amount proportional to the area of the pile hole expanded bottom. In addition, since the vertical load acting on the ready-made concrete pile is transmitted directly from the node to the reinforcing bar through the upper and lower mounting parts of the reinforcing bar, a foundation pile structure that can withstand a stable and high vertical load more reliably can be formed. effective.
【００５７】また、鉄筋かごにより既製コンクリート杭
が杭穴の中心に案内され、施工を簡略化できると共に、
既製コンクリート杭の施工精度を向上できる効果があ
る。Further, the ready-made concrete pile is guided to the center of the pile hole by the reinforcing cage, so that the construction can be simplified and
This has the effect of improving the construction accuracy of ready-made concrete piles.
【００５８】総じて、既製コンクリート杭とセメントミ
ルクとの一体化が図られ、１本の基礎杭構造で支持でき
る耐力の増加を図られ、逆に同一耐力であれば、杭穴や
既製コンクリート杭の口径を小さくできる効果がある。In general, the ready-made concrete pile and cement milk are integrated, and the strength that can be supported by one foundation pile structure is increased. Conversely, if the strength is the same, the pile hole and the ready-made concrete pile can be used. This has the effect of reducing the caliber.
【００５９】また、節部を有する既製コンクリート杭を
使用した場合には、節部を使用して鉄筋かごを係止でき
るので、既製コンクリート杭本体への鉄筋かごの嵌装係
止が容易かつ確実に行うことができ、作業性を高めるこ
とができる。When a ready-made concrete pile having a knot is used, the reinforcing cage can be locked by using the knot, so that the reinforcing cage can be easily and securely fitted to the ready-made concrete pile main body. Operability can be improved.
【図１】この発明の実施例の既製コンクリート杭で、
（ａ）は一部縦断面図、（ｂ）は（ａ）のＡ−Ａ線にお
ける断面図、（ｃ）は杭穴内に埋設した状態の概略した
正面図である。FIG. 1 shows a ready-made concrete pile according to an embodiment of the present invention;
(A) is a partial vertical cross-sectional view, (b) is a cross-sectional view taken along the line AA of (a), and (c) is a schematic front view of a state where it is embedded in a pile hole.
【図２】図１（ａ）のＢ−Ｂ線における断面図である。FIG. 2 is a cross-sectional view taken along line BB of FIG.
【図３】この発明の実施例の既製コンクリート杭を穴内
に埋設した状態の概略した正面図である。FIG. 3 is a schematic front view showing a state in which the ready-made concrete pile according to the embodiment of the present invention is buried in a hole.
【図４】この発明の他の実施例の既製コンクリート杭
で、（ａ）は一部縦断面図、（ｂ）は（ａ）のＢ−Ｂ線
における断面図、（ｃ）は杭穴内に埋設した状態の概略
した正面図である。4 (a) is a partial longitudinal sectional view, FIG. 4 (b) is a sectional view taken along the line BB of FIG. 4 (a), and FIG. It is the schematic front view of the state buried.
【図５】この発明の他の実施例の既製コンクリート杭を
穴内に埋設した状態の概略した正面図である。FIG. 5 is a schematic front view showing a state in which a ready-made concrete pile according to another embodiment of the present invention is embedded in a hole.
【図６】（ａ）乃至（ｅ）はこの発明の実施に使用する
取付鉄筋の他の実施例である。FIGS. 6A to 6E show another embodiment of the mounting rebar used in the embodiment of the present invention.
【図７】（ａ）（ｂ）は、従来例の既製コンクリート杭
を穴内に埋設した状態の概略した正面図である。FIGS. 7 (a) and 7 (b) are schematic front views of a conventional example of a ready-made concrete pile embedded in a hole.
１ 既製コンクリート杭本体 １ａ 既製コンクリート杭本体の下端部 ２ 既製コンクリート杭本体の軸部 ３ 既製コンクリート杭本体の節部 ３ａ 節部３の上縁 ３ｂ 節部３の下縁 ４ 既製コンクリート杭本体の節部（下端に位置す
る） ４ａ 節部４の上縁 ４ｂ 節部４の下縁 ５ 底面（下端） ９ かご本体 １０ 下取付部 １２ 上取付部 １４ 鉄筋かご １７ 既製コンクリート杭 １９ 杭穴の軸部 ２０ 杭穴の拡底部 ２１ 杭穴 ２２ 杭穴の底 ２３ セメントミルク ２４ 亀裂 ２５ 基礎杭構造 ２６ 取付部 ３０ 鉄筋かご ３２ 既製コンクリート杭 ３３ 基礎杭構造 ３４ 取付鉄筋 ３６ 既製コンクリート杭（従来例） ３９ 杭穴（従来例） ４１ セメントミルク（従来例） ４２ 亀裂（従来例）DESCRIPTION OF SYMBOLS 1 Ready-made concrete pile main body 1a Lower end of ready-made concrete pile main body 2 Shaft part of ready-made concrete pile main body 3 Node of ready-made concrete pile main body 3a Upper edge of node 3b 3b Lower edge of node 3 4 Node of ready-made concrete pile main body Part (located at lower end) 4a Upper edge of node 4 4b Lower edge of node 4 5 Bottom (lower end) 9 Car body 10 Lower mounting part 12 Upper mounting part 14 Reinforced basket 17 Precast concrete pile 19 Shaft of pile hole Reference Signs List 20 Expansion part of pile hole 21 Pile hole 22 Pile hole bottom 23 Cement milk 24 Crack 25 Foundation pile structure 26 Mounting part 30 Reinforced basket 32 Precast concrete pile 33 Foundation pile structure 34 Mounting reinforcement 36 Precast concrete pile (conventional example) 39 pile Hole (conventional example) 41 Cement milk (conventional example) 42 Crack (conventional example)
Claims (8)
に、前記既製コンクリート杭本体の外径より大径の外径
を有する保形された鉄筋かごを、水平垂直方向の移動を
拘束して嵌装係止し又は連結して取り付けたことを特徴
とする下端部に鉄筋かごを設けた既製コンクリート杭。1. A shape-retained reinforcing cage having an outer diameter larger than the outer diameter of the ready-made concrete pile body is fitted to an outer wall at a lower end portion of the ready-made concrete pile body while restraining horizontal and vertical movements. A ready-made concrete pile provided with a reinforcing cage at the lower end, which is fixed or connected.
端部外周を覆うと共に、前記鉄筋かごの下端は、既製コ
ンクリート杭本体の下端よりも所定長さ下方に突出させ
た請求項１記載の下端部に鉄筋かごを設けた既製コンク
リート杭。2. The lower end portion according to claim 1, wherein the reinforcing cage covers an outer periphery of a lower end portion of the precast concrete pile main body, and a lower end of the reinforcing steel cage projects a predetermined length below the lower end of the precast concrete pile main body. A ready-made concrete pile with a reinforced basket.
構造とし、１の節部又は上下に位置する異なる節部に鉄
筋かごを嵌装係止して、前記鉄筋かごを前記既製コンク
リート杭本体に水平垂直方向の移動を拘束して一体に取
り付けたことを特徴とする請求項１記載の既製コンクリ
ート杭。3. The precast concrete pile main body has a structure having a node, and a reinforcing steel cage is fitted and locked to one of the nodes or upper and lower different nodes, and the reinforcing steel cage is attached to the precast concrete pile main body. 2. The ready-made concrete pile according to claim 1, wherein the pile is attached integrally while restraining horizontal and vertical movements.
径の平面円周上に略等間隔で、縦に配置した縦鉄筋に内
接又は外接して、所定ピッチで配置した螺旋鉄筋または
所定間隔で上下に並列したリング状鉄筋群を固定してか
ご本体を形成し、該かご本体の上部内側は前記既製コン
クリート杭を嵌挿できる空間部を有し、前記かご本体
に、前記既製コンクリート杭に取り付ける為の取付鉄筋
を固着したことを特徴とする鉄筋かご。4. A spiral reinforcing bar which is inscribed or circumscribed at a substantially equal interval on a plane circumference having a diameter larger than that of a ready-made concrete pile to be attached, and which is disposed at a predetermined pitch or at a predetermined interval. A car body is formed by fixing a ring-shaped reinforcing bar group arranged vertically, and an upper inner side of the car body has a space portion into which the ready-made concrete pile can be inserted, and is attached to the car body, to the ready-made concrete pile. Reinforcing cage with an attached reinforcing bar for fixing.
保形された形状としたことを特徴とする請求項４記載の
鉄筋かご。5. The reinforced car according to claim 4, wherein the car body has a shape which is not deformed in concrete and is kept in a shape.
製コンクリート杭を埋設してなる杭構造において、前記
既製コンクリート杭の下端部外周に保形された鉄筋かご
を、水平垂直方向の移動を拘束して一体に嵌装固定し、
該鉄筋かごを拡底掘削した杭穴の拡底部に位置させたこ
とを特徴とする基礎杭構造。6. In a pile structure in which a ready-made concrete pile is buried in a pile hole filled with cement milk, a reinforcing cage held around the lower end of the ready-made concrete pile is restrained from moving in the horizontal and vertical directions. And fitted and fixed together,
A foundation pile structure, wherein the reinforcing cage is located at the bottom of a pile hole excavated at the bottom.
部を有する構造とし、少なくとも下端に位置する節部を
覆うように、鉄筋かごを嵌装固定した請求項６記載の基
礎杭構造。7. The foundation pile structure according to claim 6, wherein the precast concrete pile has a structure having nodes vertically arranged in parallel, and a reinforcing steel cage is fitted and fixed so as to cover at least a node located at a lower end.
基礎杭を構築する方法であって、上下に並列した節部を
有する既製コンクリート杭の下端部であって、下端に位
置する節部を含む位置に、前記既製コンクリート杭の外
周面及び下端面を覆うことができる、保形された鉄筋か
ごを、水平垂直方向の移動を拘束して予め嵌挿係止して
一体に取り付け、次に前記既製コンクリート杭を、セメ
ントミルクを注入しながらあるいはセメントミルクを注
入した杭穴内に、埋設することを特徴とする基礎杭の構
築方法。8. A method for constructing a foundation pile by embedding a ready-made concrete pile in a pile hole, wherein the lower end part of the ready-made concrete pile having vertically arranged nodes is located at the lower end. At a position including the outer peripheral surface and the lower end surface of the ready-made concrete pile, a shape-preserved reinforcing cage is restrained in the horizontal and vertical directions to be fitted and locked in advance and integrally attached. A method of constructing a foundation pile, characterized in that the ready-made concrete pile is buried while injecting cement milk or in a pile hole into which cement milk is injected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16494399A JP4389093B2 (en) | 1998-06-26 | 1999-06-11 | Ready-made concrete piles with reinforcing bars at the lower end, reinforcing bar cages, foundation pile structures, construction methods for foundation piles |
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| Application Number | Priority Date | Filing Date | Title |
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| JP18081998 | 1998-06-26 | ||
| JP10-180819 | 1998-06-26 | ||
| JP16494399A JP4389093B2 (en) | 1998-06-26 | 1999-06-11 | Ready-made concrete piles with reinforcing bars at the lower end, reinforcing bar cages, foundation pile structures, construction methods for foundation piles |
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| Publication Number | Publication Date |
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| JP2000080648A true JP2000080648A (en) | 2000-03-21 |
| JP4389093B2 JP4389093B2 (en) | 2009-12-24 |
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| JP16494399A Expired - Lifetime JP4389093B2 (en) | 1998-06-26 | 1999-06-11 | Ready-made concrete piles with reinforcing bars at the lower end, reinforcing bar cages, foundation pile structures, construction methods for foundation piles |
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| KR20060042370A (en) * | 2004-11-09 | 2006-05-12 | 송기용 | Pile with an extended head reinforced cement paste or concrete |
| CN103205965A (en) * | 2013-04-28 | 2013-07-17 | 何春林 | Root pressure grouting pile and construction method thereof |
| CN103485334A (en) * | 2013-09-18 | 2014-01-01 | 上海嘉实（集团）有限公司 | Bi-layer plastic-bushing inverted-arch cambered hollow special-shaped pile and construction method |
| CN105155519A (en) * | 2015-09-29 | 2015-12-16 | 中国一冶集团有限公司 | Rotary-excavating under-reamed bored pile constructing method |
| CN105887814A (en) * | 2016-04-19 | 2016-08-24 | 成都四海岩土工程有限公司 | Rotary excavating rock-embedded pedestal pile construction method |
| CN110144885A (en) * | 2019-04-09 | 2019-08-20 | 中铁大桥局集团有限公司 | A kind of three-stage large diameter bored pile structure |
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| CN106192999A (en) * | 2016-08-18 | 2016-12-07 | 王继忠 | The construction method of uplift pile |
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- 1999-06-11 JP JP16494399A patent/JP4389093B2/en not_active Expired - Lifetime
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|---|---|---|---|---|
| KR20060042370A (en) * | 2004-11-09 | 2006-05-12 | 송기용 | Pile with an extended head reinforced cement paste or concrete |
| CN103205965A (en) * | 2013-04-28 | 2013-07-17 | 何春林 | Root pressure grouting pile and construction method thereof |
| CN103485334A (en) * | 2013-09-18 | 2014-01-01 | 上海嘉实（集团）有限公司 | Bi-layer plastic-bushing inverted-arch cambered hollow special-shaped pile and construction method |
| CN103485334B (en) * | 2013-09-18 | 2015-07-15 | 上海嘉实（集团）有限公司 | Bi-layer plastic-bushing inverted-arch cambered hollow special-shaped pile and construction method |
| CN105155519A (en) * | 2015-09-29 | 2015-12-16 | 中国一冶集团有限公司 | Rotary-excavating under-reamed bored pile constructing method |
| CN105887814A (en) * | 2016-04-19 | 2016-08-24 | 成都四海岩土工程有限公司 | Rotary excavating rock-embedded pedestal pile construction method |
| CN110144885A (en) * | 2019-04-09 | 2019-08-20 | 中铁大桥局集团有限公司 | A kind of three-stage large diameter bored pile structure |
| CN111649849A (en) * | 2020-05-08 | 2020-09-11 | 兰州大学 | Combined pile end pressure monitoring device and assembling and testing method thereof |
| CN113931175A (en) * | 2021-10-22 | 2022-01-14 | 中铁隧道集团二处有限公司 | Anti-pulling and grabbing lock device suitable for bottom of water-rich huge-thick-sand-layer full-rotation sleeve piling reinforcement cage |
| CN113931175B (en) * | 2021-10-22 | 2023-06-09 | 中铁隧道集团二处有限公司 | Pulling-resistant grabbing and locking device suitable for bottom of pile forming reinforcement cage of water-rich huge-thickness sand layer full-rotation sleeve |
| CN114182828A (en) * | 2021-12-03 | 2022-03-15 | 湖北理工学院 | Embedded part for assembly type building |
| CN114922019A (en) * | 2022-06-30 | 2022-08-19 | 重庆科技学院 | Slope pavement construction method |
| CN114922019B (en) * | 2022-06-30 | 2023-04-28 | 重庆科技学院 | Slope pavement construction method |
| CN115870313A (en) * | 2023-01-09 | 2023-03-31 | 泸州历程机械有限公司 | Building pile foundation reinforcement cage recycling method |
| CN115870313B (en) * | 2023-01-09 | 2023-09-26 | 湖南志成建设工程有限公司 | Recycling method of building pile foundation reinforcement cage |
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