JP3543229B2

JP3543229B2 - Construction method of ready-made concrete pile and foundation

Info

Publication number: JP3543229B2
Application number: JP14664094A
Authority: JP
Inventors: 好伸木谷; 正登渡辺
Original assignee: Mitani Sekisan Co Ltd
Current assignee: Mitani Sekisan Co Ltd
Priority date: 1993-06-30
Filing date: 1994-06-28
Publication date: 2004-07-14
Anticipated expiration: 2019-07-14
Also published as: JPH0771032A

Description

【０００１】
【産業上の利用分野】
この発明は、既製杭及び既製杭を杭穴内に設置する基礎の構築方法に関する。
【０００２】
【従来の技術】
埋設した杭と、その杭の上方に構築予定のフーチングとを一体に連結する必要があった。この為、従来、既製コンクリート杭では、杭頭の掛止部に回転ロッドに設置した掛止具を連結して、杭を回転しながら杭穴内に設置し、設置完了後に杭頭部のコンクリートを所定長さだけ破壊して鉄筋を露出させ、露出させた鉄筋とフーチングの鉄筋とを連結していた。また、鋼管杭では同様に杭穴内に設置した後、杭頭部に連結用の鉄筋を溶接し、該鉄筋とフーチングの鉄筋とを連結していた。
【０００３】
【発明が解決しようとする課題】
前記従来の技術では、杭埋設後の杭頭部のコンクリートの破壊、あるいは連結用の鉄筋の溶接に手間が掛り、工事遅延の要因の一つとなる問題点があった。
【０００４】
【課題を解決するための手段】
然るにこの発明は、杭頭部に連結鉄筋を突出させたので、前記問題点を解決した。
【０００５】
即ちこの発明は、コンクリートを打設して形成する杭本体の主構造体に、異形鉄筋からなる連結鉄筋の下端部を固定し、該連結鉄筋の上部を前記杭本体の肉厚内に位置させると共に、前記連結鉄筋の先端部を、前記杭本体の杭端板の透孔を通して杭頭から所定長さだけ上方に突出し、前記連結鉄筋と前記端板の透孔との間にパッキングを嵌装したことを特徴とする既製コンクリート杭である。また、コンクリートを打設して形成する杭本体を構成する異形鉄筋からなる軸方向の構造鉄筋を、前記杭本体の杭端板の透孔を通して、杭頭から所定長さだけ上方に突出して連結鉄筋を構成し、前記連結鉄筋と前記端板の透孔との間にパッキングを嵌装したことを特徴とする既製コンクリート杭である。また、杭本体の端板に掛止突起を連設して、該掛止突起は端板の中空側に突出するように設けたことを特徴とする特徴とする既製コンクリート杭である。また、杭頭に連結鉄筋を覆うことができる保護カバーを被冠してなり、該保護カバーは、前記連結鉄筋に嵌装できるパイプから保護カバーを構成し、又は、前記各パイプを保護筒の内面に固定して保護カバーを構成したことを特徴とする既製コンクリート杭である。
【０００６】
また、以下のように形成したことを特徴とする基礎の構築方法である。即ち、コンクリートを打設して形成する杭本体の主構造体に連結した異形鉄筋からなる連結鉄筋の先端部を、前記杭本体の杭端板の透孔を通して杭頭から所定長さだけ上方に突出し、前記連結鉄筋と前記端板の透孔との間にパッキングを嵌装して既製コンクリート杭を構成する。回転ロッドの下端部に少なくとも連結鉄筋の長さと同等以上の長さの支持部を有する掛止具を連結する。前記掛止具を、前記連結鉄筋が突出した既製コンクリート杭に嵌合し、前記掛止具の支持部を前記既製コンクリート杭の中空部側に突出した杭頭掛止部に掛止した後、前記回転ロッドを回転しつつ前記既製コンクリート杭を杭穴内に設置し、その後前記掛止具を前記既製コンクリート杭から取り外す。続いて、基礎鉄筋を組み、該基礎鉄筋と前記連結鉄筋と連結固定し、型枠を設置して、次にコンクリートを打設して、前記基礎と前記既製コンクリート杭とを一体に構築することを特徴とする基礎の構築方法である。
【０００７】
更に、以下のように形成したことを特徴とする基礎の構築方法である。即ち、コンクリートを打設して形成する杭本体を構成する異形鉄筋からなる軸方向の構造鉄筋を、前記杭本体の杭端板の透孔を通して、杭頭から所定長さだけ上方に突出して連結鉄筋を構成し、前記連結鉄筋と前記端板の透孔との間にパッキングを嵌装して既製コンクリート杭を構成する。前記連結鉄筋に、前記連結鉄筋に嵌装できるパイプからなる保護カバー又は、前記各パイプを保護筒の内面に固定してなる保護カバーを被冠する。回転ロッドの下端部に少なくとも前記連結鉄筋の長さと同等以上の長さの支持部を有する掛止具を連結する。前記掛止具を前記既製コンクリート杭に嵌合し、前記掛止具の支持部を前記既製コンクリート杭の中空部側に突出した杭頭掛止部に掛止した後、前記回転ロッドを回転しつつ前記既製杭を杭穴内に設置し、その後前記掛止具及び前記保護カバーを前記既製コンクリート杭から取り外す。続いて、基礎鉄筋を組み、該基礎鉄筋と前記連結鉄筋と連結固定し、型枠を設置して、次にコンクリートを打設して、前記基礎と前記既製コンクリート杭とを一体に構築することを特徴とする基礎の構築方法である。
【０００８】
【作用】
連結鉄筋を杭頭部から突出させたので、この状態で杭が埋設され、基礎との連結の際に、杭頭部を破壊する作業、あるいは連結用の鉄筋を杭頭部に溶接する作業を省略できる。また、連結鉄筋の長さと同等以上の長さの支持部を有する掛止具を使用したので、回転ロッドの回転力及び押込み力を既製杭に伝えることができる。また、杭頭部に保護カバーを被冠すれば、使用中に連結鉄筋を屈曲し、汚すおそれがない。
【０００９】
【実施例１】
図１乃至図３に基づきこの発明の実施例を説明する。
【００１０】
鋼管からなる杭本体１の内面に、連結鉄筋２、２の基端部３を溶接し、該連結鉄筋２の上部は杭の肉厚内に位置させると共に、上方に突出させる。前記杭本体１に端板４を装着固定し、所定の配筋（図示していない）後、コンクリート５を打設して成形、養生してコンクリートが固化した後、前記端板４に掛止突起６を連設して、既製杭７を構成する（図１（ａ）（ｂ））。前記において、端板４の上方に突出した連結鉄筋２の長さＬは杭上方に構築すべき基礎の形状などにより種々選択する。また、図中８は連結鉄筋２と端板の透孔の間に嵌装したパッキングであり、成形時に該部からセメントペ−ストが漏れることを防止する。
【００１１】
次に、基板９の上部に回転ロッドとの連結部１２を固定し、前記基板９の下面に前記既製杭７に嵌装でき、かつ前記既製杭７の掛止突起６に係合できる掛止爪１０を有する支持部１１を突設して掛止具１３を構成する（図２（ａ））。前記掛止具１３の連結部１２を回転ロッド１４の下端部に取り付け、前記掛止具１３を前記既製杭７の上方から近付け（図２（ａ））、杭頭部７ａに嵌装し、回転ロッド１４を回動して、前記掛止具１３の掛止爪１０、１０を前記掛止突起６、６に掛止する（図１（ａ））。
【００１２】
この状態で、既製杭７を杭穴１５内に嵌挿し、回転ロッド１４を回転しつつ、既製杭７を所定位置に設置する。その後回転ロッド１４を逆回転して、前記掛止爪１０、１０と掛止突起６、６との係合を外し、回転ロッド１４、掛止具１３を引き上げる。ここで、必要ならば掛止突起６、６を取り外す。
【００１３】
次に、所定の基礎構築の為に、必要ならば地面１６を所定深さで根切りし、所定の基礎鉄筋１７、１８を組み、該基礎鉄筋１７、１８と既製杭７の連結鉄筋２、２とを溶接その他の方法で連結固定する（図１（ｃ））。次に、所定の型枠を設置後コンクリートを打設して、基礎を前記既製杭７と一体に構築する（図示していない）。
【００１４】
前記実施例において、連結鉄筋２、２は４本設けたが、既製杭７の口径や所望の強度に応じて３本以下あるいは５本以上とすることもできる。
【００１５】
また、前記実施例において、掛止突起６は端板４の外側に突出させて既製杭７を構成したが、掛止突起６を端板４の中空１９側に突出するように設けて、既製杭２０を構成することもできる（図２（ｂ））。この場合、掛止具２３は基板９に、既製杭２０の端板４の中空１９に嵌挿でき、かつ前記既製杭２０の掛止突起に係合できる掛止爪２１を有する支持部２２を突設してある（図２（ｂ））。
【００１６】
また、前記実施例において、杭本体として鉄筋コンクリート杭を使用した場合には、杭本体２５の鉄筋２６、２７に連結鉄筋２８の基端部２９を固定して、コンクリートを打設、成形、養生してコンクリートが固化した後、端板３０に掛止突起３１を連設して、既製杭３２を構成する（図３（ａ）（ｂ））。この場合も掛止突起３１を端板３０の中空部３３側に突出させることもできる（図示していない）。
【００１７】
【実施例２】
図４乃至図７に基づきこの発明の他の実施例を説明する。この実施例は、鉄筋コンクリート杭の軸方向の構造鉄筋を連結鉄筋として使用し、あるいは保護カバーを使用した実施例である。
【００１８】
杭本体３５を構成する軸方向の構造鉄筋（異形鉄筋）３６、３６の杭頭側を所定長さ上方に突出させて、該構造鉄筋３６、３６の突出した部分を連結鉄筋３７、３７とする。実施例１と同様に杭本体３５の端板３８に、掛止突起６、６を連設して既製杭３９を構成する（図４（ａ））。
【００１９】
次に、前記既製杭３９の設置方法について説明する。
【００２０】
前記既製杭３９の連結鉄筋３７、３７に嵌装できるパイプ４０、４０を、前記連結鉄筋３７、３７の位置に合わせて配置し、該パイプを連結できる保護筒４１を前記パイプ４０、４０の外側に配置し、保護筒４１の内面４１ａにパイプ４０、４０を固定して保護カバー４２を構成する（図５（ａ）（ｂ））。前記既製杭３９の杭頭部に、前記保護カバー４２を、パイプ４０、４０が連結鉄筋３７、３７に嵌装するように被冠する（図４（ｂ））。
【００２１】
前記実施例１と同様の掛止具１３を回転ロッド１４に取り付け、回転ロッド１４を回動して、前記掛止具１３の掛止爪１０、１０を前記掛止突起６、６に掛止して、杭穴１５内に挿入する（図７（ａ））。
【００２２】
所定深さに既製杭３９を設置したならば、回転ロッド１４を逆回転して、前記実施例１と同様に、回転ロッド１４、掛止具１３を引き上げ、必要ならば所定深さ根切りをし、保護カバー４２を取り外す（図７（ｂ））。次に、実施例１と同様に、必要ならば掛止突起６、６を取り外した後、基礎鉄筋１７、１８を組み、該基礎鉄筋１７、１８と既製杭３９の連結鉄筋３７、３７とを溶接その他の方法で連結固定する（図７（ｃ））。次に、所定の型枠を設置後コンクリートを打設して、基礎を前記既製杭３９と一体に構築する（図示していない）。
【００２３】
前記において、既製杭３９には保護カバーを被冠したので、運搬、施工等において、連結鉄筋３７、３７に土砂等の汚れが付着したり、外力により変形したりすることを防止できる。また、前記において、保護カバー４２を構成するパイプ４０及び保護筒４１の材質は、鋼管とすることが望ましいが、適度の剛性を有して連結鉄筋３７を保護できれば他の金属、紙、樹脂その他のものでも可能である。
【００２４】
前記実施例において、既製杭３９に予め保護カバー４２を被冠した状態で、既製杭３９ａとすることもできる（図４（ｂ））。この際、既製杭３９と保護カバー４２とを仮止めすることもできる。
【００２５】
また、前記実施例において、掛止具１３及び掛止突起６の他の実施例は前記実施例１と同様である。
【００２６】
また、前記実施例において、保護カバー４２は、パイプ４０、４０と保護筒４１から構成したが、パイプ４０、４０のみから構成することもできる（図示していない）。
【００２７】
また、保護カバー４２は連結鉄筋３７、３７を保護できれば、他の構成とすることもできる。例えば、前記保護筒４１と同程度の口径の筒体４３の下端部に、段部４４を介して既製杭３９の中空部４５と同程度の口径からなる細径部４６とし、該細径部４６の下端側に鍔部４７を形成する。前記段部４４及び鍔部４７に既製杭３９の連結鉄筋３７を挿通できる透孔４８、４９を夫々穿設する（図６（ｂ））と共に、前記鍔部４７に既製杭３９の端板の螺孔に連通する透孔５０を穿設して（図６（ａ））、保護カバー５１を構成することもできる（図６（ａ）（ｂ））。この保護カバー５１は、透孔５０に挿入したボルト５２を端板の螺穴に螺合締結して、既製杭３９に固定する。
【００２８】
また、この保護カバー４２、５２は前記実施例１の各既製杭７、２０、３２を設置する際に同様に被冠することもでき（図１（ａ）、図３（ａ）で鎖線図示４２）、各既製杭７、２０、３２に保護カバー４２を予め被冠したものを既製杭とすることもできる（図示していない）。
【００２９】
【発明の効果】
連結鉄筋の先端部を杭本体の杭頭から所定長さだけ上方に突出したので、杭設置後、構築現場での杭頭を破壊する作業を省き、あるいは杭頭に連結用の鉄筋を溶接する作業を省くことができるので、工期の短縮をはかることができる効果がある。また、連結鉄筋の長さと同等以上の長さの支持部を有する掛止具を使用して連結鉄筋を有する既製杭を設置したので、連結鉄筋が杭穴に当たるなど邪魔にならず、効率良く既製杭の設置ができる効果がある。
【図面の簡単な説明】
【図１】（ａ）はこの発明の実施例の既製杭の縦断面図、（ｂ）は同じく平面図、（ｃ）は同じく設置状態の縦断面図である。
【図２】（ａ）は使用状態の斜視図、（ｂ）は他の使用状態の斜視図である。
【図３】他の実施例の既製杭で、（ａ）は縦断面図、（ｂ）は平面図である。
【図４】（ａ）（ｂ）はこの発明の他の実施例の縦断面図である。
【図５】この発明の実施に使用する保護カバーで、（ａ）は平面図、（ｂ）は正面図である。
【図６】この発明の他の保護カバーで、（ａ）は縦断面図、（ｂ）は（ａ）とは別の位置で切断した縦断面図である。
【図７】この発明の実施例の設置方法を説明する縦断面図で、（ａ）は設置途中、（ｂ）は設置完了後、（ｃ）は基礎構築中を夫々表す。
【符号の説明】
１杭本体
２連結鉄筋
３（連結鉄筋）基端部
４端板
６掛止突起
７既製杭
１０掛止爪
１１支持部
１３掛止具
１４回転ロッド
２０既製杭
２１掛止爪
２２支持部
２３掛止具
２５杭本体
２８連結鉄筋
２９（連結鉄筋）基端部
３１掛止突起
３２既製杭
３５杭本体
３６構造鉄筋
３７連結鉄筋
３９既製杭
４２保護カバー
５１保護カバー[0001]
[Industrial applications]
The present invention relates to a method for constructing a prefabricated pile and a foundation for installing the prefabricated pile in a pile hole.
[0002]
[Prior art]
It was necessary to integrally connect the buried pile and the footing to be constructed above the pile. For this reason, conventionally, in the case of ready-made concrete piles, the hooks installed on the rotating rod are connected to the hooks on the pile head, and the pile is rotated and installed in the pile holes. The rebar was exposed by breaking it by a predetermined length, and the exposed rebar and footing rebar were connected. In the case of a steel pipe pile, similarly, after being installed in a pile hole, a connecting reinforcing bar is welded to the pile head, and the reinforcing bar and the footing reinforcing bar are connected.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional technique, there is a problem that it takes time to break concrete at the pile head after the pile is buried or to weld a reinforcing bar for connection, which is one of factors of delay in construction.
[0004]
[Means for Solving the Problems]
However, the present invention has solved the above-mentioned problem because the connecting rebar is projected from the pile head.
[0005]
That is, according to the present invention, the lower end portion of the connecting reinforcing bar made of deformed reinforcing bars is fixed to the main structure of the pile main body formed by casting concrete , and the upper portion of the connecting reinforcing bar is positioned within the thickness of the pile main body. fitted with a tip portion of the connecting reinforcing bars, wherein projecting from the pile through hole of the pile end plate of the pile body upward by a predetermined length, the packing between the connection reinforcing bars and holes of said end plate It is a ready-made concrete pile characterized by the following. Further, an axial structural reinforcing bar composed of deformed reinforcing bars constituting a pile main body formed by casting concrete is connected by projecting upward from the pile head by a predetermined length through a through hole of a pile end plate of the pile main body. A ready-made concrete pile comprising a reinforcing bar, wherein a packing is fitted between the connecting reinforcing bar and a through hole of the end plate . Further, the present invention is a ready-made concrete pile characterized in that a hooking projection is continuously provided on an end plate of a pile body, and the hooking projection is provided so as to protrude toward the hollow side of the end plate. Further, the pile head is covered with a protective cover capable of covering the connecting rebar , and the protective cover is formed of a pipe that can be fitted to the connecting rebar, or the protective cover is formed of a pipe that can be fitted to the connecting rebar. It is a ready-made concrete pile characterized by comprising a protective cover fixed to an inner surface .
[0006]
Also, there is provided a method for building a foundation characterized by being formed as follows. That is, the tip of the connection reinforcing bar made of deformed reinforcing bar connected to the main structure of the pile body formed by casting concrete is moved upward by a predetermined length from the pile head through the through hole of the pile end plate of the pile body. A projecting and packing is fitted between the connecting reinforcing bar and the through hole of the end plate to form a ready-made concrete pile. The lower end of the rotating rod connect the locking member having at least the length and the supporting portion of equal or greater length of the connecting reinforcement. After the hooking member fits prefabricated concrete pile of the connecting reinforcement is protruded, and engaging the support portion of the locking member to the pile engaging portion projecting into the hollow portion of the pre-cast concrete pile, The ready-made concrete pile is installed in the pile hole while rotating the rotating rod, and then the latch is removed from the ready-made concrete pile . Subsequently, assembling a base reinforcing bar, connecting and fixing the base reinforcing bar and the connecting reinforcing bar, installing a formwork, and then casting concrete, thereby integrally constructing the foundation and the ready-made concrete pile. This is a method for building a foundation characterized by the following .
[0007]
Further, there is provided a method for constructing a foundation characterized by being formed as follows. That is, an axial structural reinforcing bar composed of deformed reinforcing bars constituting a pile body formed by casting concrete is connected by projecting upward from the pile head by a predetermined length through a through hole in a pile end plate of the pile body. A reinforcing bar is formed, and a packing is fitted between the connecting reinforcing bar and the through hole of the end plate to form a ready-made concrete pile . The connecting rebar is covered with a protective cover made of a pipe that can be fitted to the connecting rebar or a protective cover in which each pipe is fixed to an inner surface of a protective cylinder. Connecting the locking member having at least the connection support portion of the length equal to or greater than the length of the reinforcing bars at the lower end portion of the rotating rod. It fitted the locking member in the pre-cast concrete pile, after the supporting portion of the engaging member and engaging the pile head hooking portion which projects into the hollow portion of the pre-cast concrete pile, rotate the rotating rod Then, the ready-made pile is installed in the pile hole, and then the hook and the protective cover are removed from the ready-made concrete pile . Subsequently, assembling a base reinforcing bar, connecting and fixing the base reinforcing bar and the connecting reinforcing bar, installing a formwork, and then casting concrete, thereby integrally constructing the foundation and the ready-made concrete pile. This is a method for building a foundation characterized by the following .
[0008]
[Action]
Since the connecting rebar is projected from the pile head, the pile is buried in this state, and when connecting to the foundation, work to destroy the pile head or work to weld the reinforcing bar for connection to the pile head. Can be omitted. In addition, since the hook having a support portion having a length equal to or longer than the length of the connecting rebar is used, the rotating force and the pushing force of the rotating rod can be transmitted to the ready-made pile. In addition, if the protective cover is covered on the pile head, there is no danger of bending the connecting rebar during use and soiling.
[0009]
Embodiment 1
An embodiment of the present invention will be described with reference to FIGS.
[0010]
The base ends 3 of the connecting rebars 2 and 2 are welded to the inner surface of the pile main body 1 made of a steel pipe, and the upper portion of the connecting rebar 2 is positioned within the thickness of the pile and protrudes upward. The end plate 4 is mounted and fixed to the pile main body 1, and after a predetermined reinforcing arrangement (not shown), concrete 5 is cast and formed, cured, and concrete is solidified. The projections 6 are connected to form a ready-made pile 7 (FIGS. 1A and 1B). In the above description, the length L of the connecting rebar 2 projecting above the end plate 4 is variously selected depending on the shape of the foundation to be constructed above the pile. In the drawing, reference numeral 8 denotes a packing fitted between the connecting reinforcing bar 2 and the through hole of the end plate to prevent the cement paste from leaking from the portion during molding.
[0011]
Next, the connecting portion 12 for connecting to the rotating rod is fixed on the upper part of the base plate 9, and can be fitted to the ready-made stake 7 on the lower surface of the base plate 9 and can be engaged with the locking projection 6 of the ready-made stake 7. The support 13 having the claws 10 is protruded to form the hook 13 (FIG. 2A). The connecting portion 12 of the hook 13 is attached to the lower end of the rotating rod 14, the hook 13 is approached from above the ready-made pile 7 (FIG. 2A), and fitted to the pile head 7a. By rotating the rotating rod 14, the hooks 10, 10 of the hook 13 are hooked on the hooks 6, 6 (FIG. 1 (a)).
[0012]
In this state, the ready-made pile 7 is inserted into the pile hole 15, and the ready-made pile 7 is installed at a predetermined position while rotating the rotating rod 14. Thereafter, the rotating rod 14 is rotated in the reverse direction to disengage the engaging claws 10, 10 from the engaging projections 6, 6, and the rotating rod 14 and the engaging member 13 are pulled up. Here, if necessary, the hooking projections 6, 6 are removed.
[0013]
Next, in order to construct a predetermined foundation, if necessary, the ground 16 is cut off at a predetermined depth, and predetermined foundation rebars 17 and 18 are assembled, and the connection rebars 2 of the foundation rebars 17 and 18 and the ready-made pile 7 are formed. 2 is fixed by welding or other method (FIG. 1 (c)). Next, concrete is cast after setting a predetermined formwork, and a foundation is constructed integrally with the ready-made pile 7 (not shown).
[0014]
In the above embodiment, four connecting reinforcing bars 2 are provided, but three or less or five or more can be used according to the diameter of the ready-made pile 7 and a desired strength.
[0015]
Further, in the above-described embodiment, the hanging projection 6 is formed to protrude to the outside of the end plate 4 to form the ready-made pile 7. However, the hanging projection 6 is provided so as to protrude toward the hollow 19 side of the end plate 4. The pile 20 can also be comprised (FIG. 2B). In this case, the hook 23 is provided on the base plate 9 with the support portion 22 having a hook 21 which can be inserted into the hollow 19 of the end plate 4 of the ready-made stake 20 and can be engaged with the hook projection of the ready-made stake 20. It is protruded (FIG. 2B).
[0016]
In the above embodiment, when a reinforced concrete pile is used as the pile body, the base end portion 29 of the connecting reinforcing bar 28 is fixed to the reinforcing bars 26 and 27 of the pile body 25, and concrete is poured, formed, and cured. After the concrete is solidified, the hooking projections 31 are connected to the end plate 30 to form the ready-made pile 32 (FIGS. 3A and 3B). Also in this case, the hooking projection 31 can be projected toward the hollow portion 33 of the end plate 30 (not shown).
[0017]
Embodiment 2
Another embodiment of the present invention will be described with reference to FIGS. This embodiment is an embodiment in which a structural reinforcing bar in the axial direction of a reinforced concrete pile is used as a connecting reinforcing bar, or a protective cover is used.
[0018]
The pile head side of the structural reinforcing bars (deformed reinforcing bars) 36, 36 in the axial direction constituting the pile main body 35 is projected upward by a predetermined length, and the protruding portions of the structural reinforcing bars 36, 36 are used as connecting reinforcing bars 37, 37. . As in the first embodiment, the hooking projections 6 and 6 are continuously provided on the end plate 38 of the pile main body 35 to form a ready-made pile 39 (FIG. 4A).
[0019]
Next, a method of installing the ready-made pile 39 will be described.
[0020]
The pipes 40, 40 that can be fitted to the connecting rebars 37, 37 of the ready-made pile 39 are arranged in accordance with the positions of the connecting rebars 37, 37, and the protection cylinder 41 that can connect the pipes is placed outside the pipes 40, 40. And the pipes 40, 40 are fixed to the inner surface 41a of the protective cylinder 41 to form the protective cover 42 (FIGS. 5A and 5B). The protection cover 42 is put on the pile head of the ready-made pile 39 so that the pipes 40, 40 are fitted to the connecting reinforcing bars 37, 37 (FIG. 4B).
[0021]
A hook 13 similar to that of the first embodiment is attached to a rotating rod 14, and the rotating rod 14 is rotated to hook the hooks 10, 10 of the hook 13 on the hook projections 6, 6. Then, it is inserted into the pile hole 15 (FIG. 7A).
[0022]
When the ready-made pile 39 is installed at a predetermined depth, the rotating rod 14 is rotated in the reverse direction, and the rotating rod 14 and the hook 13 are pulled up as in the first embodiment. Then, the protective cover 42 is removed (FIG. 7B). Next, similarly to the first embodiment, if necessary, the hooking projections 6, 6 are removed, and the base reinforcing bars 17, 18 are assembled, and the base reinforcing bars 17, 18 and the connecting reinforcing bars 37, 37 of the ready-made pile 39 are connected. It is connected and fixed by welding or other methods (FIG. 7 (c)). Next, concrete is cast after setting a predetermined formwork, and a foundation is constructed integrally with the ready-made pile 39 (not shown).
[0023]
In the above, since the protective cover is covered on the ready-made pile 39, it is possible to prevent dirt such as earth and sand from adhering to the connecting reinforcing bars 37, 37 and to be deformed by external force during transportation and construction. In the above description, it is desirable that the material of the pipe 40 and the protective cylinder 41 constituting the protective cover 42 be a steel pipe, but other metals, paper, resin, and the like, as long as they have appropriate rigidity and can protect the connecting reinforcing bar 37. It is also possible.
[0024]
In the above-described embodiment, the ready-made pile 39a may be used in a state where the protective cover 42 is previously covered with the ready-made pile 39 (FIG. 4B). At this time, the ready-made pile 39 and the protective cover 42 can be temporarily fixed.
[0025]
In the above embodiment, other embodiments of the hook 13 and the hook protrusion 6 are the same as those of the first embodiment.
[0026]
Further, in the above embodiment, the protective cover 42 has been constituted pipes 40, 40 from the protective tube 41, may be composed of only pipes 40, 40 (not shown).
[0027]
Further, the protective cover 42 may have another configuration as long as it can protect the connecting reinforcing bars 37, 37. For example, a small-diameter portion 46 having the same diameter as the hollow portion 45 of the ready-made stake 39 is provided at the lower end portion of the cylindrical body 43 having the same diameter as the protective cylinder 41 via the step portion 44. A collar portion 47 is formed at the lower end of 46. Through holes 48 and 49 through which the connecting reinforcing bar 37 of the ready-made pile 39 can be inserted are respectively formed in the step portion 44 and the flange portion 47 (FIG. 6B), and the end plate of the ready-made pile 39 is provided in the flange portion 47. The protective cover 51 may be formed by forming a through-hole 50 communicating with the screw hole (FIG. 6A) (FIGS. 6A and 6B). The protective cover 51 is fixed to the ready-made pile 39 by screwing a bolt 52 inserted into the through hole 50 into a screw hole of the end plate.
[0028]
Further, the protective covers 42, 52 can be similarly covered when the ready-made piles 7, 20, 32 of the first embodiment are installed (shown by chain lines in FIGS. 1 (a) and 3 (a)). 42), each of the ready-made piles 7, 20, 32 in which the protective cover 42 is covered in advance can be used as the ready-made pile (not shown).
[0029]
【The invention's effect】
Since the tip of the connecting bar protrudes upward from the pile head of the pile body by a predetermined length, the work of destroying the pile head at the construction site after installing the pile is omitted, or the reinforcing bar for connection is welded to the pile head. Since the work can be omitted, there is an effect that the construction period can be shortened. In addition, since a ready-made stake with a connecting rebar was installed using a hook with a support part with a length equal to or longer than the length of the connecting rebar, the connecting rebar hits the pile hole without disturbing it and efficiently There is an effect that a pile can be installed.
[Brief description of the drawings]
1A is a longitudinal sectional view of a ready-made pile according to an embodiment of the present invention, FIG. 1B is a plan view of the same, and FIG. 1C is a longitudinal sectional view of an installed state.
2A is a perspective view in a use state, and FIG. 2B is a perspective view in another use state.
3 (a) is a longitudinal sectional view and FIG. 3 (b) is a plan view of a ready-made pile according to another embodiment.
FIGS. 4A and 4B are longitudinal sectional views of another embodiment of the present invention.
5 (a) is a plan view and FIG. 5 (b) is a front view of a protective cover used in the embodiment of the present invention.
6A and 6B are longitudinal sectional views of another protective cover according to the present invention, in which FIG. 6A is a longitudinal sectional view, and FIG. 6B is a longitudinal sectional view cut at a different position from FIG.
FIGS. 7A and 7B are longitudinal sectional views illustrating an installation method according to an embodiment of the present invention, wherein FIG. 7A shows installation, FIG. 7B shows installation completion, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile main body 2 Connecting rebar 3 (connecting rebar) base end part 4 End plate 6 Hanging projection 7 Ready made pile 10 Hanging claw 11 Supporting part 13 Hanging tool 14 Rotating rod 20 Ready made pile 21 Hanging claw 22 Supporting part 23 Hanging Stopper 25 Pile body 28 Connecting rebar 29 (Connecting rebar) Base end 31 Latch projection 32 Prefabricated pile 35 Pile body 36 Structural rebar 37 Connecting rebar 39 Prefabricated pile 42 Protective cover 51 Protective cover

Claims

A lower end portion of a connecting reinforcing bar made of deformed reinforcing bars is fixed to a main structure of a pile main body formed by casting concrete , and an upper portion of the connecting reinforcing bar is positioned within the thickness of the pile main body, and the connecting reinforcing bar is formed. A projecting portion of the pile body projecting upward from the pile head through a through hole of the pile end plate of the pile body by a predetermined length , and a packing is fitted between the connecting reinforcing bar and the through hole of the end plate. And ready-made concrete piles.

An axial structural reinforcing bar consisting of deformed reinforcing bars constituting a pile body formed by casting concrete is projected upward from the pile head by a predetermined length through a through hole in a pile end plate of the pile body to form a connecting reinforcing bar. A ready-made concrete pile , wherein a packing is fitted between the connecting reinforcing bar and the through hole of the end plate .

3. A ready-made concrete pile according to claim 1, wherein a hooking projection is continuously provided on the end plate of the pile body, and the hooking projection is provided so as to project toward the hollow side of the end plate. .

The pile head is covered with a protective cover capable of covering the connecting rebar , and the protective cover forms a protective cover from a pipe that can be fitted to the connecting rebar, or each pipe is provided on the inner surface of a protective cylinder. The ready-made concrete pile according to claim 1 or 2, wherein the protective cover is fixed .

(1) The tip of the connecting reinforcing bar made of deformed reinforcing bar connected to the main structure of the pile main body formed by casting concrete is raised a predetermined length from the pile head through the through hole of the pile end plate of the pile main body. And a packing is fitted between the connecting rebar and the through hole of the end plate to form a ready-made concrete pile.
(2) connected the locking device having at least the length and the supporting portion of equal or greater length of the connecting reinforcing bars to the lower end of the rotating rod.
(3) the locking device, fitted to the pre-cast concrete pile the coupling reinforcing bars is projected, engaging the supporting portion of the locking member to the pile engaging portion projecting into the hollow portion of the prefabricated concrete pile Then, the ready-made concrete pile is installed in the pile hole while rotating the rotating rod, and then the hook is removed from the ready-made concrete pile .
(4) Subsequently, assembling the foundation rebar, connecting and fixing the foundation rebar and the connecting rebar, installing a formwork, then pouring concrete, and integrally joining the foundation and the ready-made concrete pile. A foundation building method characterized by building.

(1) An axial structural reinforcing bar composed of deformed reinforcing bars constituting a pile body formed by casting concrete is projected upward by a predetermined length from a pile head through a through hole of a pile end plate of the pile body. A connecting reinforcing bar is formed, and a packing is fitted between the connecting reinforcing bar and the through hole of the end plate to form a ready-made concrete pile . The connecting rebar is covered with a protective cover made of a pipe that can be fitted to the connecting rebar or a protective cover in which each pipe is fixed to an inner surface of a protective cylinder.
(2) connecting the locking member having at least the connection length and the support portion of equal or greater length of the rebar in the lower end portion of the rotating rod.
(3) the locking device fitted to the pre-cast concrete pile, after the supporting portion of the engaging member and engaging the pile head hooking portion which projects into the hollow portion of the pre-cast concrete pile, the rotating rod Then, the ready-made pile is installed in the pile hole while rotating, and then the hook and the protective cover are removed from the ready-made concrete pile .
(4) Subsequently, assembling the foundation rebar, connecting and fixing the foundation rebar and the connecting rebar, installing a formwork, then pouring concrete, and integrally joining the foundation and the ready-made concrete pile. method for constructing a foundation, characterized in that to build.