Divisiontension type represtressed preflex composite bridge by steel I-type girder having uniform section

摘要

The present invention relates to a leaf restraint preflex composite girder bridge, which has been conventionally vulnerable because of welding a segmented steel I-girder.;The present invention is a skeleton of a preflex composite beam or a repreflex composite beam 10 in which steel I type girder 7, reinforced concrete (4) (6) and P.C.strand 5 are combined as shown in FIG. The upper flange 7a and the lower flange 7c of the steel I type girder 7 having the structure are composed of one sheet of steel sheet over the entire length of the beam 10, and then divided into three segments 701, 702, and 703. After fabrication by dividing, the joints of each segment 701, 702, and 703 are mechanically jointed as the respective joint plates 700a, 700b, 700c and the bolt 9, and the welding joints 100 are all In order to avoid residual stress caused by welding, and to combine steel I type girder (7), lower flange concrete (4) and P. C. strand (5) as described above, The middle part constant length of the slab is located in the cross section of the lower flange concrete 4, and the predetermined lengths at both ends thereof are arranged to penetrate the inside of the cross section of the abdominal concrete 6b. After pouring the concrete curing abdomen (6b) it will have to settle the tension.