JP2004176385A

JP2004176385A - Reaction receiving member for press-fitting device detachably fixed to outer periphery of columnar structure

Info

Publication number: JP2004176385A
Application number: JP2002343219A
Authority: JP
Inventors: Akira Amano; 明天野; Hiroshi Yokoyama; 広横山
Original assignee: Sho Bond Corp; Shiraishi Co Ltd
Current assignee: Sho Bond Corp; Shiraishi Co Ltd
Priority date: 2002-11-27
Filing date: 2002-11-27
Publication date: 2004-06-24
Anticipated expiration: 2022-11-27
Also published as: JP4061359B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reaction receiving member easily installable and applicable even in a narrow space to receive the reaction of a jack device in press-fitting or jacking up a member to the outer periphery of a columnar structure by the jack device. <P>SOLUTION: The reaction receiving member for the jack device detachably fixed to the outer periphery of the columnar structure is composed of two divided reaction receiving blocks, and two divided reaction receiving blocks are combined to form a similar cross section slightly larger than the cross section of the columnar structure. A plurality of horizontal ribs of prescribed thickness are formed on the outer peripheries of the reaction receiving blocks at prescribed spaces in the axial direction of the reaction receiving blocks, and two divided reaction receiving blocks are arranged at the outer periphery of the columnar structure. An epoxy resin adhesive is filled in a clearance between the outer periphery of the columnar structure and the inner periphery of the reaction receiving block, and solidified for fixing. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、橋脚、杭基礎、煙突等の柱状構造物の外側に補強部材等を設置するための圧入装置を、柱状構造物に着脱自在に固定するために使用する柱状構造物に設置される反力受け部材に関する。
【０００２】
【従来の技術】
（従来例１）
高架橋の橋脚、建物の杭基礎、煙突その他の柱状構造物において、柱状構造物の補強を目的として、柱状構造物の外側に補強部材を設置する柱状構造物の補強方法が実施される。例えば、建物の基礎としての基礎杭等の柱状構造物の外側に補強部材を設置する補強方法において、２つに分割された補強鋼板ブロックを、柱状構造物の外周に組立て配置し、組立てられた補強鋼板を、柱状構造物に沿って圧入装置により地中に圧入する補強方法が提案されている。その際、圧入装置を、基礎杭の上部構造物と圧入される補強部材との間に配置し、上部構造物を反力受けとして利用する柱状構造物の補強方法が、特開平１０−１３１１７６号公報に開示されている。
【０００３】
（従来例２）
また、本件出願人の出願である特開２０００−３３６９４６号公報において、別の柱状構造物の補強方法が提案されている。従来例２を図７及び図８により説明する。
橋桁１０２を支持する橋脚１０３を補強するため、２つに分割された断面半円形状の鋼板ブロックを橋脚１０３の外周に配置する。２つの断面半円形状の鋼板ブロックをボルト又は溶接により接合して橋脚１０３の断面形状と相似の断面形状の補強用鋼板１０５とする。橋脚１０３の外周に圧入装置１０４を着脱自在に固定する。圧入装置１０４は、圧入反力受け用上部チャック１０６と圧入力付勢用（兼上昇用）下部チャック１０７と、上下部チャック１０６，１０７間を連結する圧入用ジャッキ１１０とから構成される。上部チャック１０６と下部チャック１０７は同一構成であるので、以下では、上部チャック１０６について説明し、下部チャック１０７については上部チャック１０６と同一要素に同一符号を付して説明を省略する。上部チャック１０６は、左右に分割された円弧状の分割フレーム１１１，１１１の一端が連結軸１１２により蝶番式に連結されており、各分割フレーム１１１，１１１の他端に設けた両ブラケット１１３，１１３に両分割フレーム１１１，１１１間を緊締，開放自在なチャック用ジャッキ１１４が連結ピン１１５を介して両ブラケット１１３，１１３に対し、着脱自在に設けられている。したがって、連結ピン１１５をピン孔から脱嵌し、左右の分割フレーム１１１，１１１の円弧先端部間を切り離し、十分に開いて橋脚１０３の外面に当てがい、連結ピン１１５を再びピン孔に挿入し、その後、チャック用ジャッキ１１４を伸縮作動させることで、分割フレーム１１１，１１１で橋脚１０３の外面を緊締して固定し、または緊締を開放して橋脚１０３に対しフリーな状態にすることができる。これは、下部チャック１０７についても同様である。上部チャック１０６における各分割フレーム１１１，１１１の中間部下面側には、圧入用ジャッキ１１０のシリンダー側が連結ピン１１６で結合されており、下部チャック１０７における各分割フレーム１１１，１１１の中間部上面側には、圧入用ジャッキ１１０の作動杆側が連結ピン１１７で結合されている。したがって、前記チャック用ジャッキ１１４の伸縮動作と、前記圧入用ジャッキ１１０の伸縮動作を所定のタイミングで行わせることにより、圧入装置１０４を橋脚１０３に沿って所定の範囲で、尺取虫的に上下動させ、これの繰り返しで所定長さの複数の補強用鋼板１０５を順次押下げて、橋脚１０３の上下方向全長に亘り被覆するものである。
【０００４】
【特許文献１】
特開平１０−１３１１７６号公報
【特許文献２】
特開２０００−３３６９４６号公報
【０００５】
【発明が解決しようとする課題】
しかし、従来例１の補強工法は、基礎杭の上部に建造物の下部構造が存在することを前提としたものであり、柱状構造物の上部に反力受けとなる構造物が存在しない場合や、反力受けとなる構造物と補強部材の圧入位置との間隔が大きい場合は適用できないものであり、さらに、反力受けとなる構造物に損害を与えることがあるという問題点を有するものであった。
また、従来例２の補強工法は、前記従来例１の補強工法の問題点については解決しているが、圧入装置１０４の反力受け用上部チャック１０６を、直接橋脚１０３の外面に緊締して固定するものであるため、上部チャック１０６を強い力で橋脚１０３の外周に緊締しないと、補強用鋼板１０５を圧入する際、上部チャック１０６自体が上方向に移動してしまい、補強用鋼板１０５を地中に圧入できない状態が生じたり、あまり強い力で橋脚１０３の外面に緊締したりアンカーボルトなどで緊結すると、橋脚１０３自体に損害を与えるという問題点を有するものであった。
さらにまた、橋脚１０３自体に損害を与えるという問題は、その程度が極めて短時間であっても、極めて僅少であっても、橋脚１０３の強度低下に確実に起因する重要な問題を包含しているため、活線工事における本例の採用は難しいと言わざるを得ない。
【０００６】
本願発明は、前記従来の柱状構造物の補強工法の問題点を解決することを目的とする。
【０００７】
【問題を解決するための手段】
前記の目的を達成するため、本願発明の第１発明は、柱状構造物の外周に着脱自在に固定される圧入装置の反力受け部材において、該反力受け部材を２つに分割された反力受けブロックで構成し、２つに分割された反力受けブロックを組み合せることにより、前記柱状構造物の断面形状より若干大きい相似形の断面形状となるようにし、前記反力受けブロックの外周に所定厚の水平リブを前記ブロックの軸方向に所定間隔で複数形成し、２つに分割された前記反力受けブロックを前記柱状構造物の外周に配置し、前記柱状構造物の外周と前記反力受けブロックの内周との環状間隙にエポキシ樹脂系接着剤を注入し固化させることにより反力受け部材を柱状構造物に固定することを特徴とする。
【０００８】
本願第２発明は、本願第１発明の柱状構造物の外周に着脱自在に固定される反力受け部材において、柱状構造物の外周に沿って部材を設置するための圧入装置を柱状構造物外周に着脱自在に固定するため、前記ジャッキ装置の固定手段の内周に設けた環状溝と前記反力受け部材の水平リブとが係合することを特徴とする。
【０００９】
本願第３発明は、本願第１又は第２発明の柱状構造物の外周に着脱自在に固定される反力受け部材において、柱状構造物に反力受け部材を固定することで、該反力受け部材自体が柱状構造物の補強手段となることを特徴とする。
【００１０】
【作用】
上記のように構成された本願発明においては、柱状構造物の外周に該柱状構造物の断面形状と相似の断面形状を有する反力受け部材をエポキシ系接着剤で固定することにより、反力受け部材は１０Ｎ／ｍｍ^２以上の引張せん断強度が得られ、該反力受け部材の表面に所定厚の水平リブを該反力受け部材の軸方向に所定間隔で複数形成さるものであるので、圧入装置の固定手段の内周に形成した環状溝と、前記反力受け部材の外周に形成した帯状リブとが係合し、それ程強い力で圧入装置の固定手段を緊締しなくとも、圧入装置の補強部材圧入又は押し上げ時の反力を、反力受け部材の水平リブと圧入装置の固定手段の環状溝との係合部が負担し、柱状構造物自体に圧縮力等の負荷を与えることがないので、柱状構造物に損害を与えることがない。また、水平リブが、軸方向に所定間隔で複数形成されているため、圧入装置の固定位置を変えることにより、軸方向に長い作動可能領域を得ることができる。
さらにまた、該反力受け部材は、強固に柱状構造物に固着されることから、柱状構造物が要求する補強部分が反力受け部材を固定する位置にまでおよぶ場合でも撤去を要さず、該反力受け部材自体を補強部材の一構成要素として取扱うことができる。
【００１１】
【発明の実施の形態】
本願発明の柱状構造物の外周に着脱自在に固定される圧入装置の反力受け部材の構成を図１〜４により説明する。図１に示されるように、柱状構造物の外周に着脱自在に固定される圧入装置の反力受け部材１は、２つに分割された反力受けブロック２，３により構成される。図１では、反力受けブロック２，３は、断面形状が半円形のものが示されているが、柱状構造物の断面形状に応じて、例えば柱状構造物の断面が矩形である場合は、反力受けブロック２，３の断面形状はコ字状というように、２つに分割された反力受けブロック２，３を組み合わせた断面形状は、反力受け部材１の設置される柱状構造物の断面形状より若干大きい相似の断面形状となるようにされ、柱状構造物の外周と反力受け部材１の内周との間には接着剤を充填するための環状間隙が形成される。
【００１２】
反力受けブロック２，３は、鋼板、ステンレススチール等の金属で形成され、軸方向に所定の長さを有する。反力受けブロック２，３の外周には、軸方向に所定の間隔をおいて、互いに平行な所定厚さの水平リブ４が設置される。水平リブ４も鋼板、ステンレススチール等の金属で形成され、図３に示されるように反力受けブロック２，３の表面に溶接などの手段により固定される。また、水平リブ４を反力受けブロック２，３の本体と一体に形成してもよい。
【００１３】
図２は、柱状構造物５の外周に反力受け部材１が設置された状態を示すものである。柱状構造物５の外周に、２つに分割された反力受けブロック２、３を組み合わせて配置し、柱状構造物５と反力受けブロック２，３との環状間隙に液状のエポキシ樹脂系接着剤７を充填する。環状間隙に充填されたエポキシ樹脂系接着剤７は固化して、反力受け部材１は、柱状構造物５の外周にしっかり固定される。柱状構造物外面と反力受け部材の内面は、エポキシ樹脂系接着剤７との接着性を考慮して、それぞれの表面を粗面とするなど接着剤と被接着材の性質を考慮することが望ましい。
【００１４】
図４，５により、反力受け部材１の使用状態を説明する。図４，５は、断面円形の柱状構造物５の外周に補強部材６を下向きに圧入する場合の実施例を示すものである。柱状構造物５の外周に補強部材６設置するための圧入装置８は、上部チャック９と下部チャック１０を有し、上部チャック９と下部チャック１０とが押圧ジャッキ１１により連結されて構成される。
【００１５】
先ず、上部チャック９について説明する。上部チャック９は、左右に分割された円弧状の分割フレーム１２，１２の一端が連結軸１３により蝶番式に連結されており、各分割フレーム１２，１２の他端に設けたブラケット１４，１４に両分割フレーム１２，１２間を緊締、開放自在なチャック用ジャッキ１５が連結ピン１６を介して両ブラケット１４，１４に対し、着脱自在に設けられる。上部チャック９の分割されたフレーム１２，１２の内周には、環状溝１７が設けられる。環状溝１７の幅は、前記柱状構造物５の外周に設置された反力受け部材１の外周に形成された水平リブ４の幅より若干大きくされ、環状溝１７の深さは、前記反力受け部材１の外周に形成された水平リブ４の厚さと同等か、若干深くされる。
【００１６】
したがって、連結ピン１６をピン孔から脱嵌し、左右の分割フレーム１２，１２の先端部間を切り離し、十分開いた状態で柱状構造物５の外周に設置された反力受け部材１の外面の水平リブ４に、分割フレーム１２，１２の内周に形成した環状溝１７が係合するように当てがい、連結ピン１６を再びピン孔に挿入し、その後、チャック用ジャッキ１５を伸縮作動させることで、分割フレーム１２，１２で、柱状構造物５の外周に設置された反力受け部材１に緊締固定する。
【００１７】
下部チャック１０は、上部チャック９と同一構成のものとしても良い。上下部チャック９，１０を同一構成とした場合、柱状構造物５の外周に下向きに部材を圧入する場合には、上部チャック９が反力受け用、下部チャック１０が押圧力付勢用となり、柱状構造物５の外周に上向きに部材をジャッキアップする場合には、下部チャック１０が反力受け用、上部チャック９が押圧力付勢用となる。上部チャック９を圧入時の反力受け専用とし、下部チャック１０を押圧力付勢専用とする場合には、下部チャック１０の分割フレームの内周に環状溝１７を形成しなくても良い。但し、柱状構造物５の外周に沿って上向きに部材を押し上げる場合は、圧入装置８の上部チャック９を下側に、下部チャック１０を上側というように、互いの位置関係を逆にして柱状構造物５の外周に設置する必要がある。
【００１８】
上下部チャック９，１０との間を連結する押圧ジャッキ１１は、シリンダー１８とピストン１９により構成され、それぞれ上下部チャック９，１０に連結軸２０，２１により蝶番式に連結される。
【００１９】
柱状構造物５の外周に設置される補強部材６は、２つに分割された補強ブロック２２，２２により構成され、２つの分割された補強ブロック２２，２２を組み合わせることにより、被補強部材である柱状構造物５の断面形状と相似の断面形状となるように構成される。各補強ブロック２２の両側縁には、複数のボルト挿入孔を有する接合フランジ２３が形成され、２つの補強ブロック２２，２２を柱状構造物の外周で組み合わせ、接合フランジ２３同士をボルト２４で連結して補強部材６とする。また、接合フランジ２３は、溶接などの固着手段をもって補強部材６とすることでも構わない。先端補強部材６ａは、地中への圧入を容易とするために、その先端にテーパーガイド部２５を形成するのが好ましい。さらに、先端補強部材６ａのテーパーガイド部２５の内側には、柱状構造物５の外周面をブラッシングするためのワイヤーブラシまたはワイヤーメッシュ等の研磨材を配置したり、テーパーガイド部２５の先端から高圧水を噴射して、補強部材６の地中への圧入時の摩擦の低減と、テーパーガイド部２５からの土砂の進入を防止を図るようにするのが好ましい。
【００２０】
次に、本願発明の反力受け部材１を用いて、柱状構造物５の外周に補強部材６を圧入する施工手順を説明する。
（１）柱状構造物５の外周に、分割された反力受けブロック２，３を組み合わせて反力受け部材１を配置し、柱状構造物５の外周と反力受け部材１の内周との間隙にエポキシ樹脂系接着剤７を充填し固化させ、反力受け部材１を柱状構造物５の外周に固定する。
（２）柱状構造物５の外周に、圧入装置８の上部チャック９の分割フレーム１２，１２を、上部チャック９の分割フレーム１２，１２の内周に形成した環状溝１７と反力受け部材１の外周に形成した水平リブ４とを係合させ、チャック用ジャッキ１５により緊締固定する。
（３）柱状構造物５で外周に２つに分割された補強ブロック２２，２２を配置し、接合フランジ２３同士をボルト２４で連結し、先端補強部材６ａを組立てる。
（４）圧入装置８の下部チャック１０を柱状構造物５の先端補強部材６ａの上端に位置させ、下部チャック１０が柱状構造物５に沿って移動可能なようにチャック用ジャッキ１５を調節する。
（５）圧入装置８の押圧ジャッキ１１のピストン１９を伸長し、下部チャック１０の下端で、先端補強部材６ａの上端部を押圧し、先端補強部材６ａを地中に圧入する。
（６）圧入装置８の下部チャック１０を上昇させ、所定位置で下部チャック１０をチャック用ジャッキ１５で固定する。
（７）圧入装置の上部チャック９のチャック用ジャッキ１５を開放し、上部チャック９を、反力受け部材１の外周の今まで係合していた水平リブ４の下方の水平リブ４と反力受け部材１の内周の環状溝１７が係合する位置まで下降させ、チャック用ジャッキ１５により緊締固定する。
（８）先端補強部材６ａの上部に、補強部材６ｂを組立て、先端補強部材６ａの上端部と補強部材６ｂの下端部を、溶接又はボルト等の固定手段で固定する。
（９）以下前記（４）〜（８）の工程を繰り返す。
【００２１】
（試験例）
外径５００ｍｍの鋼管杭の外周に反力受け部材１を実際に設置し、耐力試験をした試験例を紹介する。反力受け部材１は、２つに分割された鋼板製の断面半円形の反力受けブロック２，３で構成され、分割された反力受けブロックは、肉厚９ｍｍ、軸方向の長さ１５００ｍｍ、２つに分割された反力受けブロックを組み合わせて円筒形状の反力受け部材１とした時の円筒形の内径を５２０ｍｍとした。反力受けブロック２，３の外周面には、上から３００ｍｍの間隔を置いて、幅１００ｍｍ、肉厚１９ｍｍの鋼板製の水平リブ４を三段溶接により固定した。２つに分割された反力受けブロック２，３を、外径５００ｍｍの鋼管杭の外周で組み合わせ、内径５２０ｍｍの円筒形状の反力受け部材１とし、鋼管杭と円筒形状の反力受け部材１とに生じる１０ｍｍ一定間隔の環状空隙の下端部をシール部材によりシールし、反力受け部材１の下部に設けた注入口より液状のエポキシ樹脂系接着剤７を注入し、前記環状空隙の上端までエポキシ樹脂系接着剤７を充填し固化させ、反力受け部材１を鋼管杭の外周に固定した。この反力受け部材１の外周の水平リブ４に圧入装置８の固定手段の内周に形成した環状溝１７を係合させ緊締し、圧入装置８の押圧ジャッキ１１を作動させ、反力受け部材１の耐久試験をした結果、反力受け部材は、１０Ｎ／ｍｍ^２以上の引張せん断強度を有し、地中に補強部材を圧入する際の圧入装置の反力受け部材として十分な機能を有することが証明された。
【００２２】
次に、柱状構造物に補強部材を設置した後の反力受け部材の取扱いについて述べる。柱状構造物の老朽化や耐震基準の向上などにより補強部材の設置が必要となるが、その必要補強長さは既設柱状構造物の性状により異なり、柱状構造物の下手部の補強で十分な場合や柱状構造物全体まで補強を必要とする場合がある。本発明の反力受け部材は、前述のように柱状構造物に強固に固定されるものであるから、この特徴をさらに活用し、該反力受け部材自体を補強部材の構成要素の一つとして設計に加味することや、該反力部材のさらに外周に補強部材を覆設することで柱状構造物の補強を可能とする。勿論、該反力受け部材の撤去が必要な場合は、カッタ切断や火器による溶断など公知の技術で容易に対応できる。
【００２３】
【発明の効果】
本願発明によれば、柱状構造物の外周に該柱状構造物の断面と相似の断面を有する反力受け部材をエポキシ系接着剤で固定することにより、反力受け部材は１０Ｎ／ｍｍ^２以上の引張せん断強度が得られ、該反力受け部材の表面に所定厚の水平リブを該反力受け部材の軸方向に所定間隔で複数形成さるものであるので、圧入装置の固定手段の内周に形成した環状溝と、前記反力受け部材の外周に形成した帯状リブとが係合し、それ程強い力で圧入装置の固定手段を緊締しなくとも、圧入装置の補強部材圧入又はジャッキアップ時の反力を、反力受け部材の水平リブと圧入装置の固定手段の環状溝との係合部が負担し、柱状構造物自体に過度の圧縮力等の負荷を与えることがないので、柱状構造物に損害を与えることがない。また、水平リブが、軸方向に所定間隔で複数形成されているため、圧入装置の固定位置を変えることにより、軸方向に長い作動可能領域を得ることができる。さらにまた、該反力受け部材は強固に柱状構造物に固定されるため、該反力受け部材自体が柱状構造物の補強手段となり得る。
【図面の簡単な説明】
【図１】本願発明の反力受け部材を示す概略図
【図２】本願発明の反力受け部材を柱状構造物に固定した状態を示す概略図
【図３】本願発明の反力受け部材の一部拡大図
【図４】本願発明の反力受け部材にジャッキ装置を着脱自在とする一例を示す概略図
【図５】図４のＡ−Ａ線の断面図
【図６】柱状構造物の外周に設置される補強部材の概略図
【図７】従来の圧入装置を示す図
【図８】従来の圧入装置の一部断面図
【符号の説明】
１：反力受け部材
２：反力受けブロック
３：反力受けブロック
４：水平リブ
５：柱状構造物
６：補強部材
６ａ：先端補強部材
７：エポキシ樹脂系接着剤
８：圧入装置
９：上部チャック
１０：下部チャック
１１：押圧ジャッキ
１２：分割フレーム
１３：連結軸
１４：ブラケット
１５：チャック用ジャッキ
１６：連結ピン
１７：環状溝
１８：シリンダー
１９：ピストン
２０：上部チャックとジャッキ装置との連結軸
２１：下部チャックとジャッキ装置の連結軸
２２：補強ブロック
２３：接合フランジ
２４：ボルト
２５：先端補強部材のテーパーガイド部[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, a press-fitting device for installing a reinforcing member or the like on the outside of a columnar structure such as a pier, a pile foundation, a chimney or the like is installed on a columnar structure used for detachably fixing the columnar structure. The present invention relates to a reaction force receiving member.
[0002]
[Prior art]
(Conventional example 1)
2. Description of the Related Art In a bridge pier, a pile foundation of a building, a chimney, and other columnar structures, a reinforcing method of a columnar structure in which a reinforcing member is installed outside the columnar structure is implemented for the purpose of reinforcing the columnar structure. For example, in a reinforcing method in which a reinforcing member is installed outside a columnar structure such as a foundation pile as a foundation of a building, a reinforced steel plate block divided into two is assembled and arranged on the outer periphery of the columnar structure and assembled. A reinforcing method has been proposed in which a reinforced steel plate is pressed into the ground along a columnar structure by a press-fitting device. At that time, a method for reinforcing a columnar structure using a press-fitting device disposed between an upper structure of a foundation pile and a reinforcing member to be press-fitted and using the upper structure as a reaction force receiver is disclosed in JP-A-10-131176. It is disclosed in the gazette.
[0003]
(Conventional example 2)
In addition, Japanese Patent Application Laid-Open No. 2000-336946 filed by the present applicant proposes another method of reinforcing a columnar structure. Conventional Example 2 will be described with reference to FIGS.
In order to reinforce the pier 103 supporting the bridge girder 102, a steel plate block having a semicircular cross section divided into two is disposed on the outer periphery of the pier 103. The two steel plate blocks having a semicircular cross section are joined by bolts or welding to form a reinforcing steel plate 105 having a cross sectional shape similar to the cross sectional shape of the pier 103. A press fitting device 104 is detachably fixed to the outer periphery of the pier 103. The press-fitting device 104 includes an upper chuck 106 for receiving a press-fitting reaction force, a lower chuck 107 for urging (and ascending) for press-fitting, and a jack 110 for press-fitting which connects the upper and lower chucks 106 and 107. Since the upper chuck 106 and the lower chuck 107 have the same configuration, only the upper chuck 106 will be described below, and the same elements of the lower chuck 107 as those of the upper chuck 106 will be denoted by the same reference numerals and description thereof will be omitted. The upper chuck 106 has one end of an arc-shaped divided frame 111, which is divided into right and left, hingedly connected by a connecting shaft 112, and both brackets 113, 113 provided at the other end of each divided frame 111, 111. Further, a chuck jack 114 for freely tightening and releasing between the two divided frames 111, 111 is provided detachably with respect to both brackets 113, 113 via a connecting pin 115. Therefore, the connecting pin 115 is disengaged from the pin hole, the left and right divided frames 111 and 111 are separated from each other at the arc tip end, sufficiently opened and applied to the outer surface of the pier 103, and the connecting pin 115 is inserted into the pin hole again. After that, the outer surface of the pier 103 is tightened and fixed by the divided frames 111, 111, or the tightening is released to make the pier 103 free, by expanding and contracting the chuck jack 114. This is the same for the lower chuck 107. The cylinder side of the press-fitting jack 110 is connected to the lower surface of the intermediate portion of each of the divided frames 111, 111 in the upper chuck 106 by a connecting pin 116, and the upper surface of the intermediate portion of each of the divided frames 111, 111 in the lower chuck 107 is connected. The operating rod side of the press-fitting jack 110 is connected by a connecting pin 117. Therefore, by causing the expansion and contraction operation of the chuck jack 114 and the expansion and contraction operation of the press-in jack 110 to be performed at a predetermined timing, the press-in device 104 is moved up and down in a predetermined range along the pier 103 in the form of a worm. By repeating this, a plurality of reinforcing steel plates 105 having a predetermined length are sequentially pushed down to cover the entire length of the pier 103 in the vertical direction.
[0004]
[Patent Document 1]
JP-A-10-131176 [Patent Document 2]
JP 2000-336946 A
[Problems to be solved by the invention]
However, the reinforcement method of Conventional Example 1 is based on the premise that the lower structure of the building exists above the foundation pile, and there is no structure that receives the reaction force above the columnar structure. However, it is not applicable when the distance between the reaction receiving structure and the press-fitting position of the reinforcing member is large, and furthermore, there is a problem that the reaction receiving structure may be damaged. there were.
The reinforcing method of Conventional Example 2 solves the problem of the reinforcing method of Conventional Example 1, but the reaction force receiving upper chuck 106 of the press-fitting device 104 is directly tightened to the outer surface of the pier 103. Since the upper chuck 106 is not fastened to the outer periphery of the pier 103 with a strong force because it is fixed, the upper chuck 106 itself moves upward when the reinforcing steel plate 105 is press-fitted. There is a problem that the pier 103 itself may be damaged if it cannot be pressed into the ground or if it is tightened to the outer surface of the pier 103 with too much force or if it is tightened with an anchor bolt or the like.
Furthermore, the problem of damaging the pier 103 itself, even if the degree is extremely short or extremely small, includes an important problem definitely caused by the decrease in the strength of the pier 103. Therefore, it must be said that it is difficult to adopt this example in live line construction.
[0006]
An object of the present invention is to solve the problem of the conventional columnar structure reinforcing method.
[0007]
[Means to solve the problem]
In order to achieve the above object, a first invention of the present invention is directed to a reaction force receiving member of a press-fitting device which is detachably fixed to an outer periphery of a columnar structure, wherein the reaction force receiving member is divided into two parts. It is constituted by a force receiving block, and by combining the reaction force receiving block divided into two, a sectional shape similar to the sectional shape of the columnar structure is slightly larger than that of the columnar structure. A plurality of horizontal ribs having a predetermined thickness are formed at predetermined intervals in the axial direction of the block, and the reaction force receiving block divided into two is disposed on the outer periphery of the columnar structure. The reaction force receiving member is fixed to the columnar structure by injecting and solidifying an epoxy resin-based adhesive into an annular gap with the inner periphery of the reaction force receiving block.
[0008]
The second invention of the present application is a reaction force receiving member detachably fixed to the outer periphery of the columnar structure of the first invention of the present application, wherein a press-fitting device for installing the member along the outer periphery of the columnar structure is provided. In order to detachably fix the jack device, an annular groove provided on the inner periphery of the fixing means of the jack device and a horizontal rib of the reaction force receiving member are engaged.
[0009]
The third invention of the present application is directed to a reaction force receiving member detachably fixed to an outer periphery of the columnar structure of the first or second invention of the present application, wherein the reaction force receiving member is fixed to the columnar structure. The member itself serves as reinforcing means for the columnar structure.
[0010]
[Action]
In the present invention configured as described above, a reaction force receiving member having a cross-sectional shape similar to the cross-sectional shape of the columnar structure is fixed to the outer periphery of the columnar structure with an epoxy-based adhesive, so that the reaction force receiving member is fixed. The member has a tensile shear strength of 10 N / mm ² or more, and a plurality of horizontal ribs having a predetermined thickness are formed on the surface of the reaction force receiving member at predetermined intervals in the axial direction of the reaction force receiving member. The annular groove formed on the inner periphery of the fixing means of the device and the band-shaped rib formed on the outer periphery of the reaction force receiving member engage with each other, so that the fixing means of the press-fitting device is not tightened with such a strong force. The engaging force between the horizontal rib of the reaction force receiving member and the annular groove of the fixing means of the press-fitting device bears the reaction force at the time of press-fitting or pushing up the reinforcing member, and a load such as a compressive force is applied to the columnar structure itself. There is no damage to the columnar structure. No. In addition, since a plurality of horizontal ribs are formed at predetermined intervals in the axial direction, an operable region that is long in the axial direction can be obtained by changing the fixing position of the press-fitting device.
Furthermore, since the reaction force receiving member is firmly fixed to the columnar structure, even if the reinforcing portion required by the columnar structure extends to the position where the reaction force receiving member is fixed, removal is not required, The reaction force receiving member itself can be handled as one component of the reinforcing member.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The structure of the reaction force receiving member of the press-fitting device which is detachably fixed to the outer periphery of the columnar structure of the present invention will be described with reference to FIGS. As shown in FIG. 1, the reaction force receiving member 1 of the press-fitting device which is detachably fixed to the outer periphery of the columnar structure is constituted by reaction force receiving blocks 2 and 3 divided into two. In FIG. 1, the reaction force receiving blocks 2 and 3 have a semicircular cross-sectional shape. However, according to the cross-sectional shape of the columnar structure, for example, when the cross section of the columnar structure is rectangular, The cross-sectional shape of the reaction force receiving blocks 2 and 3 is a columnar structure in which the reaction force receiving member 1 is installed. The cross-sectional shape is slightly larger than the cross-sectional shape of the columnar structure, and an annular gap for filling the adhesive is formed between the outer periphery of the columnar structure and the inner periphery of the reaction force receiving member 1.
[0012]
The reaction force receiving blocks 2 and 3 are formed of a metal such as a steel plate or stainless steel, and have a predetermined length in the axial direction. Horizontal ribs 4 having a predetermined thickness parallel to each other are provided on the outer periphery of the reaction force receiving blocks 2 and 3 at predetermined intervals in the axial direction. The horizontal rib 4 is also formed of a metal such as a steel plate or stainless steel, and is fixed to the surfaces of the reaction force receiving blocks 2 and 3 by welding or the like as shown in FIG. Further, the horizontal rib 4 may be formed integrally with the main body of the reaction force receiving blocks 2 and 3.
[0013]
FIG. 2 shows a state in which the reaction force receiving member 1 is installed on the outer periphery of the columnar structure 5. Two divided reaction force receiving blocks 2 and 3 are arranged in combination on the outer periphery of the columnar structure 5, and a liquid epoxy resin-based adhesive is attached to the annular gap between the columnar structure 5 and the reaction force receiving blocks 2 and 3. The agent 7 is filled. The epoxy resin adhesive 7 filled in the annular gap is solidified, and the reaction force receiving member 1 is firmly fixed to the outer periphery of the columnar structure 5. The outer surface of the columnar structure and the inner surface of the reaction force receiving member may take into consideration the properties of the adhesive and the material to be bonded, such as making each surface rough, in consideration of the adhesiveness with the epoxy resin adhesive 7. desirable.
[0014]
The use state of the reaction force receiving member 1 will be described with reference to FIGS. FIGS. 4 and 5 show an embodiment in which the reinforcing member 6 is pressed down to the outer periphery of the columnar structure 5 having a circular cross section. The press-fitting device 8 for installing the reinforcing member 6 on the outer periphery of the columnar structure 5 has an upper chuck 9 and a lower chuck 10, and the upper chuck 9 and the lower chuck 10 are connected by a pressing jack 11.
[0015]
First, the upper chuck 9 will be described. The upper chuck 9 has one end of an arc-shaped divided frame 12, which is divided into right and left, hingedly connected by a connection shaft 13 to a bracket 14, 14 provided at the other end of each divided frame 12, 12. A chuck jack 15 which can tighten and release between the two divided frames 12, 12 is provided on the brackets 14 via a connecting pin 16 so as to be detachable. An annular groove 17 is provided on the inner periphery of the divided frames 12, 12 of the upper chuck 9. The width of the annular groove 17 is slightly larger than the width of the horizontal rib 4 formed on the outer periphery of the reaction force receiving member 1 installed on the outer periphery of the columnar structure 5, and the depth of the annular groove 17 is The thickness is equal to or slightly deeper than the thickness of the horizontal rib 4 formed on the outer periphery of the receiving member 1.
[0016]
Accordingly, the connecting pin 16 is disengaged from the pin hole, the left and right divided frames 12, 12 are separated from each other at the tip end, and the reaction force receiving member 1 installed on the outer periphery of the columnar structure 5 in a sufficiently opened state is formed. An annular groove 17 formed on the inner periphery of the divided frames 12 and 12 is engaged with the horizontal rib 4 so that the connecting pin 16 is inserted into the pin hole again, and then the chuck jack 15 is extended and contracted. Then, the divided frames 12 are tightly fixed to the reaction force receiving member 1 installed on the outer periphery of the columnar structure 5.
[0017]
The lower chuck 10 may have the same configuration as the upper chuck 9. When the upper and lower chucks 9 and 10 have the same configuration, when a member is pressed down into the outer periphery of the columnar structure 5, the upper chuck 9 is for receiving a reaction force, and the lower chuck 10 is for biasing a pressing force. When the member is jacked upward on the outer periphery of the columnar structure 5, the lower chuck 10 is for receiving a reaction force, and the upper chuck 9 is for urging a pressing force. When the upper chuck 9 is dedicated to receiving the reaction force at the time of press-fitting and the lower chuck 10 is dedicated to biasing the pressing force, the annular groove 17 may not be formed on the inner periphery of the divided frame of the lower chuck 10. However, when the member is pushed upward along the outer periphery of the columnar structure 5, the positional relationship between the columnar structure and the upper chuck 9 of the press-fitting device 8 is set to the lower side, and the lower chuck 10 is set to the upper side. It must be installed on the outer periphery of the object 5.
[0018]
The pressing jack 11 that connects the upper and lower chucks 9 and 10 includes a cylinder 18 and a piston 19, and is hingedly connected to the upper and lower chucks 9 and 10 by connecting shafts 20 and 21, respectively.
[0019]
The reinforcing member 6 installed on the outer periphery of the columnar structure 5 is composed of two divided reinforcing blocks 22, and is a member to be reinforced by combining the two divided reinforcing blocks 22. It is configured to have a cross-sectional shape similar to the cross-sectional shape of the columnar structure 5. A joining flange 23 having a plurality of bolt insertion holes is formed on both side edges of each reinforcing block 22. The two reinforcing blocks 22 are combined on the outer periphery of the columnar structure, and the joining flanges 23 are connected to each other by bolts 24. To form a reinforcing member 6. Further, the joining flange 23 may be formed as the reinforcing member 6 by a fixing means such as welding. It is preferable to form a tapered guide portion 25 at the tip of the tip reinforcing member 6a in order to facilitate press-fitting into the ground. Further, an abrasive such as a wire brush or a wire mesh for brushing the outer peripheral surface of the columnar structure 5 is disposed inside the tapered guide portion 25 of the distal end reinforcing member 6a. It is preferable to inject water to reduce the friction at the time of press-fitting the reinforcing member 6 into the ground and to prevent earth and sand from entering from the tapered guide portion 25.
[0020]
Next, a procedure for press-fitting the reinforcing member 6 to the outer periphery of the columnar structure 5 using the reaction force receiving member 1 of the present invention will be described.
(1) The reaction force receiving member 1 is disposed on the outer periphery of the columnar structure 5 by combining the divided reaction force receiving blocks 2 and 3, and the outer periphery of the columnar structure 5 and the inner periphery of the reaction force receiving member 1 are arranged. The gap is filled with an epoxy resin adhesive 7 and solidified, and the reaction force receiving member 1 is fixed to the outer periphery of the columnar structure 5.
(2) On the outer periphery of the columnar structure 5, the divided frames 12, 12 of the upper chuck 9 of the press-fitting device 8, the annular groove 17 formed on the inner periphery of the divided frames 12, 12, of the upper chuck 9, and the reaction force receiving member 1 Is engaged with the horizontal rib 4 formed on the outer periphery of the device, and tightened and fixed by the chucking jack 15.
(3) The reinforcing blocks 22, 22 divided into two around the columnar structure 5 are arranged, the joining flanges 23 are connected to each other with bolts 24, and the tip reinforcing member 6 a is assembled.
(4) The lower chuck 10 of the press-fitting device 8 is positioned at the upper end of the distal end reinforcing member 6a of the columnar structure 5, and the chuck jack 15 is adjusted so that the lower chuck 10 can move along the columnar structure 5.
(5) The piston 19 of the pressing jack 11 of the press-fitting device 8 is extended, and the lower end of the lower chuck 10 presses the upper end of the tip reinforcing member 6a to press-fit the tip reinforcing member 6a into the ground.
(6) The lower chuck 10 of the press-fitting device 8 is raised, and the lower chuck 10 is fixed at a predetermined position with the chuck jack 15.
(7) The chuck jack 15 of the upper chuck 9 of the press-fitting device is opened, and the upper chuck 9 reacts with the horizontal rib 4 on the outer periphery of the reaction force receiving member 1 below the horizontal rib 4 which has been engaged so far. It is lowered to a position where the annular groove 17 on the inner periphery of the receiving member 1 is engaged, and is tightened and fixed by the chuck jack 15.
(8) The reinforcing member 6b is assembled on the top of the tip reinforcing member 6a, and the upper end of the tip reinforcing member 6a and the lower end of the reinforcing member 6b are fixed by welding or fixing means such as bolts.
(9) The above steps (4) to (8) are repeated.
[0021]
(Test example)
A test example in which the reaction force receiving member 1 is actually installed on the outer circumference of a steel pipe pile having an outer diameter of 500 mm and a proof test is performed will be introduced. The reaction force receiving member 1 is composed of two reaction force receiving blocks 2 and 3 made of a steel plate and having a semicircular cross section, and the divided reaction force receiving block has a thickness of 9 mm and an axial length of 1500 mm. When the reaction force receiving block divided into two was combined to form a cylindrical reaction force receiving member 1, the inner diameter of the cylindrical shape was 520 mm. Horizontal ribs 4 made of a steel plate having a width of 100 mm and a thickness of 19 mm were fixed to the outer peripheral surfaces of the reaction force receiving blocks 2 and 3 at a distance of 300 mm from the top by three-step welding. The reaction force receiving blocks 2 and 3 divided into two parts are combined on the outer periphery of a steel pipe pile having an outer diameter of 500 mm to form a cylindrical reaction force receiving member 1 having an inner diameter of 520 mm, and the steel pipe pile and the cylindrical reaction force receiving member 1 are combined. Is sealed with a seal member at the lower end of the annular gap at a constant interval of 10 mm, and a liquid epoxy resin-based adhesive 7 is injected from an injection port provided at a lower portion of the reaction force receiving member 1 to the upper end of the annular gap. The epoxy resin adhesive 7 was filled and solidified, and the reaction force receiving member 1 was fixed to the outer periphery of the steel pipe pile. The annular groove 17 formed on the inner periphery of the fixing means of the press-fitting device 8 is engaged with the horizontal rib 4 on the outer periphery of the reaction-force receiving member 1 and tightened, and the pressing jack 11 of the press-fitting device 8 is actuated. As a result of the durability test of No. 1, the reaction force receiving member has a tensile shear strength of 10 N / mm ² or more, and has a sufficient function as a reaction force receiving member of a press-fitting device when the reinforcing member is pressed into the ground. It was proved.
[0022]
Next, handling of the reaction force receiving member after the reinforcing member is installed on the columnar structure will be described. Installation of reinforcing members is required due to aging of columnar structures or improvement of seismic standards, but the required reinforcement length depends on the properties of existing columnar structures, and it is sufficient to reinforce the lower part of columnar structures And the entire columnar structure may need to be reinforced. Since the reaction force receiving member of the present invention is firmly fixed to the columnar structure as described above, this feature is further utilized, and the reaction force receiving member itself is used as one of the components of the reinforcing member. It is possible to reinforce the columnar structure by taking into account the design and covering the outer periphery of the reaction member with a reinforcing member. Of course, when the reaction force receiving member needs to be removed, it can be easily dealt with by a known technique such as cutting with a cutter or fusing with a firearm.
[0023]
【The invention's effect】
According to the present invention, a reaction force receiving member having a cross section similar to the cross section of the columnar structure is fixed to the outer periphery of the columnar structure with an epoxy-based adhesive, so that the reaction force receiving member has a force of 10 N / mm ² or more. Tensile shear strength is obtained, and a plurality of horizontal ribs having a predetermined thickness are formed on the surface of the reaction force receiving member at predetermined intervals in the axial direction of the reaction force receiving member. The formed annular groove and the band-shaped rib formed on the outer periphery of the reaction force receiving member are engaged with each other. The reaction force is borne by the engaging portion between the horizontal rib of the reaction force receiving member and the annular groove of the fixing means of the press-fitting device, and a load such as an excessive compressive force is not applied to the columnar structure itself. There is no damage to things. In addition, since a plurality of horizontal ribs are formed at predetermined intervals in the axial direction, an operable region long in the axial direction can be obtained by changing the fixing position of the press-fitting device. Furthermore, since the reaction force receiving member is firmly fixed to the columnar structure, the reaction force receiving member itself can be a reinforcing means for the columnar structure.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a reaction force receiving member of the present invention; FIG. 2 is a schematic view showing a state where the reaction force receiving member of the present invention is fixed to a columnar structure; FIG. FIG. 4 is a schematic view showing an example in which the jack device is detachably attached to the reaction force receiving member of the present invention. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 4 FIG. FIG. 7 is a schematic view of a conventional press-fitting device. FIG. 8 is a partial cross-sectional view of the conventional press-fitting device.
1: reaction force receiving member 2: reaction force receiving block 3: reaction force receiving block 4: horizontal rib 5: columnar structure 6: reinforcing member 6a: tip reinforcing member 7: epoxy resin adhesive 8: press-fitting device 9: upper part Chuck 10: Lower chuck 11: Pressing jack 12: Split frame 13: Connecting shaft 14: Bracket 15: Jack for chuck 16: Connecting pin 17: Annular groove 18: Cylinder 19: Piston 20: Connecting shaft between upper chuck and jack device 21: Connecting shaft of lower chuck and jack device 22: Reinforcing block 23: Joint flange 24: Bolt 25: Tapered guide portion of tip reinforcing member

Claims

In a reaction force receiving member of a press-fitting device detachably fixed to an outer periphery of a columnar structure, the reaction force receiving member is constituted by a reaction force receiving block divided into two, and a reaction force divided into two is formed. By combining the receiving blocks, a similar cross-sectional shape is slightly larger than the cross-sectional shape of the columnar structure, and a horizontal rib having a predetermined thickness is formed around the reaction force receiving block in the axial direction of the reaction force receiving block. A plurality of the reaction force receiving blocks are formed at predetermined intervals, and the reaction force receiving blocks divided into two are combined and arranged on the outer periphery of the columnar structure. A reaction force receiving member of a press-fitting device detachably fixed to an outer periphery of a columnar structure, wherein the reaction force receiving member is fixed to the columnar structure by filling and solidifying an epoxy resin-based adhesive.

An annular groove provided on an inner periphery of a fixing means of the press-fitting device and the reaction force receiving member for detachably fixing the press-fitting device for pushing down or pushing up the member along the outer periphery of the columnar structure to the outer periphery of the columnar structure; The reaction force receiving member of the press-fitting device detachably fixed to the outer periphery of the columnar structure according to claim 1, wherein the horizontal rib is engaged with the horizontal rib.

The reaction force receiving member itself serves as reinforcing means for the columnar structure by fixing the reaction force receiving member to the columnar structure, and is detachably attached to the outer periphery of the columnar structure according to claim 1 or 2. The reaction force receiving member of the press-fitting device fixed to the.