| 摘要 |
PROBLEM TO BE SOLVED: To provide an expansion device of a bridge joint section capable of easily corresponding also to a large amount of expansion of earthquake motion level 2 by a comparatively simple expansion device at a low cost, having the excellence in a joint performance such as durability, workability, maintenance, reduced noise, low vibration and perfect cut-off efficiency or the like and making available for the time of peace as well even if an expansion spacing is furthermore greatly opened in the case of big earthquake in the cantilever beam finger joint type expansion device. SOLUTION: The expansion device of the bridge joint section is so constituted that the expansible spacing 16 is formed between a surface member 11 consisting of a pair of comb face plates 20 and 20 and a pair of substratum members 12 and 12 installed by holding the expansion spacing 2 in the notched bottom, a sandwich construction is formed by holding an intermediate member 13 consisting of a beam-like high-strength fiber reinforced concrete or the like continued in the direction at right angles to a widening bride axis having sliding surfaces in up and down, and an expansion gap 17 in both sides of the intermediate member 13 is closed by an elastic sealing member 15, and that the intermediate member 13 always supports a finger section of the surface member 11 to the expansion of a main girder. COPYRIGHT: (C)2007,JPO&INPIT
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