| 摘要 |
PROBLEM TO BE SOLVED: To provide a main girder structure of a truss bridge allowing the assembly of members at an assembly factory and capable of shortening construction term and improving machining precision. SOLUTION: This main girder structure of the truss bridge having the three- dimensional truss structure is constituted such that a main girder supporting a floor slab 1 is composed of a pair of top chords 3a, 3b fixed to a lower face of the floor slab 1 at a fixed interval in the direction of width of the floor slab 1 and connected by a top chord horizontal linking member 2, a pair of bottom chords 5a, 5b arranged below a pair of top chords 3a, 3b in such a way that its interval becomes narrower than the interval of a pair of top chords 3a, 3b and connected by a bottom chord horizontal linking member 4, and a plurality of diagonal members 6 connecting the top chords and the bottom chords mutually.
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