| 摘要 |
A method of rebuilding a viaduct without interrupting service on the old structure by over topping it with a new, higher viaduct well above existing traffic, includes the following: Erecting new span supporting columns arrayed along either side of the old viaduct. New columns are temporarily connected to old viaduct to strengthen it for a temporary scaffold role transporting heavy subassemblies into position atop the new columns. The subassemblies or their components would typically arrive at a staging area alongside the old viaduct for preparation and hoisting the subassemblies onto a high dolly atop the old viaduct. The subassemblies are assembled into spans on the high dolly atop the old viaduct roadbed surface to transport and position the spans sequentially onto respective columns beginning with columns at extreme ends of the old viaduct and successively hoisting and transporting more subassemblies until a new higher viaduct roadbed is assembled well over the still functioning old viaduct.
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