WATER CUT-OFF METHOD OF COFFERDAM STRUCTURE USED WITH BRIDGE PIER REPAIR/REINFORCEMENT WORK: Fid-Bau Portal

WATER CUT-OFF METHOD OF COFFERDAM STRUCTURE USED WITH BRIDGE PIER REPAIR/REINFORCEMENT WORK

SATO YUUKI / MURAKAMI KOJI / KASUGA HIDEFUMI

PROBLEM TO BE SOLVED: To provide a water cut-off method for a cofferdam structure used with bridge pier repair/reinforcement work that enables a cofferdam structure with a wide work space to be constructed.SOLUTION: A cofferdam structure 3 is constructed at an upper part of a bridge pier 1, the cofferdam structure being installed to surround an outer periphery of the bridge pier 1, having a through-hole part 4 provided at a bottom part through which the bridge pier 1 may penetrate and be disposed, and having a foundation mounting part 5 provided around the through-hole part 4 that may be mounted on a top surface of a wide foundation part 2 at a lower part of the bridge pier 1. An undersurface of the foundation mounting part 5 is brought in press-contact with and mounted on a top surface of the wide foundation part 2 for water cut-off, by submerging the cofferdam structure 3 underwater below the bridge, fixing a strut support bracket 6 on the bridge pier 1 above the cofferdam structure 3, spanning a strut member 7 between the strut support bracket 6 and a top surface of the foundation mounting part 5 at an inner bottom part of the cofferdam structure 3, and pressing the foundation mounting part 5 downward by extending the strut member 7.SELECTED DRAWING: Figure 1

【課題】広い作業スペースの仮締切り構造体を構築可能となる橋脚補修・補強工事に用いる仮締切り構造体の止水工法を提供すること。【解決手段】橋脚１の上方で、橋脚１の外周を囲むように設置され底部に橋脚１を貫通配設可能な貫通孔部４が設けられると共に貫通孔部４の周囲に橋脚１下部の幅広基礎部２の上面に載置可能な基礎載置部５が設けられる仮締切り構造体３を構築し、仮締切り構造体３を橋下の水中に降下させ、仮締切り構造体３より上方の橋脚１に突っ張り支持ブラケット６を固定し、突っ張り支持ブラケット６と仮締切り構造体３内底部の基礎載置部５の上面との間に突っ張り部材７を架設し、突っ張り部材７を伸長して基礎載置部５を下方へ押し下げることにより、基礎載置部５の下面を幅広基礎部２の上面に圧接載置し止水する。【選択図】図１

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