To provide a rational composite segment of expanding an interval between main girders.
This composite segment forms a composite structure of a steel shell 15 and concrete 4, by filling the concrete 4 in the steel shell 15 formed of the main girder 1, a joint plate 2 and a skin plate 3. The composite segment has a dislocation stopper 12 inside at least an inside surface side flange 5a in the main girder 1, by arranging two main girders having at least on the tunnel inside surface side the flange 5a projecting in the segment inside direction from a web 15 of the main girder 1 in the vertical direction to a web 16 of the main girder 1, joining the respective joint plates 2 arranged at the right-angled direction to the main girder 1 to both end parts in the longitudinal direction of the main girder, fixing the skin plate 3 to the respective main girders 1 and the joint plates 2 so as to block up the natural ground side of the respective main girders 1 and the joint plates 2, and fixing a long size steel material 13 such as a reinforcement or a steel plate to the respective main girders 1 so as to extend the mutual main girders 1 to at least any one of the natural ground side or the inside surface side.
COPYRIGHT: (C)2008,JPO&INPIT
ISHIDA MUNEHIRO
MIYAKE MASATO
NAKAJIMA MASANARI
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Yasuhiko