Incremental Launching of Structures
Publication: Journal of Structural Engineering
Volume 109, Issue 2
Abstract
The incremental launching method for concrete structures was first developed in the early 1960'S. Since then it has spread all over the world. Bridges constructed by this method are cast in segments behind an abutment in a stationary form against a previously cast segment of the bridge girder. The whole superstructure is then longitudinally jacked forward incrementally to make room for the next segment in the stationary form. This method combines the advantages of precasting with those of cast‐in‐place methods, resulting in a high concrete quality and low costs. Remarkable achievements of incrementally launched bridges the to data are: Longest continuous superstructure [3,809 ft (1,161 m)]; longest span in final stage [551 ft (168 m)]; longest span during launching with auxiliary stays on top [436 ft (133 m)]; and a strongly curved bridge superstructure in plan with a radius of 492 ft (150 m). The incremental launching method has also been applied to buildings; e.g. across railway tracks. A new potential application is the construction of underwater tunnels. The main savings are achieved by the reduced labor and equipment expenditure.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 109 • Issue 2 • February 1983
Pages: 520 - 537
Copyright
Copyright © 1983 ASCE.
History
Published online: Feb 1, 1983
Published in print: Feb 1983
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