| 摘要 |
PROBLEM TO BE SOLVED: To provide an expansion device 4 for a highway bridge having high strength against load and large allowable expansion amount. SOLUTION: This expansion device 4 for the road bridge is provided with a pair of horizontal plates 5, 5 extending in the longitudinal direction of joint of the road bridge and a pair of vertical plates 6, 6 supporting each horizontal plate 5, respectively, and extending in the longitudinal direction of joint. The horizontal plates 5, 5 are formed into recessed and projecting shapes in which mutually opposing one sides come in and out in the direction of bridge length, and mutual recessed parts 11 and projecting parts 12 oppose so as to form a play clearance 9 allowing the expansion and shrinkage of a road bridge main body 1. The vertical plates 6 are connected with a lower face of an intermediate part of the projecting part 12 so as to support the intermediate part of each projecting part 12 of the horizontal plates 5 and are extended in the longitudinal direction of joint. |
