| 摘要 |
A method of erecting a new elevated roadway (41) above an existing roadway (21) in order to increase traffic capacity of bridge roadway (23) with minimal disruption of existing traffic. Roadway (41), which comprises a plurality of interconnected ramp units and bridging units, is erected in multiple steps by initially erecting entrance/exit ramp unit (46) and moveable ramp unit (45) with their uppermost ends facing each other, then intermittently, during periods of off-peak traffic, creating a gap in a previously erected portion of roadway (41) by moving ramp unit (45) along roadway (21), erecting a bridging unit in the gap, and opening an extended portion of roadway (41) to traffic in time for the next period of peak traffic. This method can be used for reconstructing different types of bridges and highways.
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