| 摘要 |
PROBLEM TO BE SOLVED: To provide a box girder bridge structure and its construction method capable of easily and quickly constructing an upper floor slab and a lower floor slab at a low cost at need only with a form supported by a simple form supporting device by utilizing a truss girder. SOLUTION: In the box girder bridge, a girder used as a web by a box girder is used as the truss girder 17 using a plurality of pre-cast concrete-made web units 2 of a truss structure equipped with a pre-cast concrete member 1, a plurality of truss girders 17 are used to erect over piers or abutments 23 adjoining them in the direction of a bridge axis, the upper floor slab 41 and the lower floor slab 40 at need are integrally constructed of a cast-in-place concrete between both adjoining truss girders 17 at an interval in the direction intersecting the direction of the bridge axis, outside cable 36 are arranged. The outside cables 36 is anchored in a tension state over girders 31 of both end sections in the direction of the bridge axis provided to the truss girders 17 or over these end sections to introduce a tensile force. COPYRIGHT: (C)2005,JPO&NCIPI
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