| 摘要 |
A construction method of a channel bridge for correcting sag is provided to construct the channel bridge securely and accurately by longitudinally prestressing U-shaped segments in restricting subsidence of the U-shaped segments supported in a temporary beam. Temporary beams(320) are longitudinally and successively installed on a temporary lower structure(310) with temporary bents spaced longitudinally, and a rail member(323) is mounted in the temporary beam. A lifting unit(400) with a hydraulic jack is installed in an upper part of a trolley(330) moving along the rail member, and a U-shaped segment(100) is loaded in the trolley and directly supported in the lifting unit. Plural U-shaped segments are integrally connected by pushing the trolley forward along the temporary beam, and sag of the U-shaped segment is corrected by operating the lifting unit. A tendon(500) penetrating the U-shaped segments is strained and fixed to support a lower bridge structure with the U-shaped segments. The U-shaped segment is supported in the lifting unit, and moved along the rail member of the temporary beam with the trolley. |
