| 摘要 |
PROBLEM TO BE SOLVED: To install a crossing viaduct mainly exclusive for a light-weight car to a railroad crossing, a road intersection, a small river or sections near to the crossing, intersection and small river, in which there is severe traffic congestion, and to form constitution, which is simple, is small-sized and is easy to resist load and is hard to collapse even in an earthquake. SOLUTION: Left-right bent and lowered sections are pinched and inserted to cutting sections or cutting ribs formed to the left and the right of the upper sections of plate steel surfaces 5 fixed onto steel columns in piers or plate steel surfaces 4 covering the opposed internal surfaces of the piers, the central sections of several strips of parallel beam steel (two or one vertical surface) stretched to the left-right piers are heightened, or joints are used to the left and the light for heightening, supporting steel is pinched and inserted to the internal surfaces of the apices of the left-right vertical surfaces of beam steel, plate-steel surfaces or angle steel is pinched and inserted into the opening sections of beam steel and the plate- steel surfaces, vertical sections are formed to the undersides of angle steel and pinching-holding sections or the like to top faces, and beam steel bent down to the left and the right by such treatment or the bent and lowered sections by heat treatment are supported by splice-plate steel, lifting steel, vertical reinforcements, in which intermediate sections are thickened, or the like.
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