Incremental Launching Method
Producing a cycle in the stationary production facility and launching the entire superstructure
The individual section of the superstructure 15 to 30 m long, are cast in a stationary production facility (casting yard) behind the abutment. When the concrete hardens, the new section and the existing superstructure are post-tensioned together with tendons. Then the entire superstructure is advanced across the piers by one cycle length, pushed forward by hydraulic shifting devices and moving on temporary slide bearings (Teflon-coated plates). To reduce the cantilever moments while the superstructure is being launched, a launching nose made of steel is attached to the lead section so that it is already supported by the next pier.
Highlights
- reinforcing, forming, casting and advancing in the stationary production facility: process-oriented completion of the sections for high efficiency and quality
- the piers are constructed in advance
- work steps are separated: the trough is cast first, followed by casting of the deck slab
- economical for repeat cycles and repositioning processes
- bridging valleys, rivers, sea straits, nature conservation areas
- nothing to obstruct traffic (road, rail, shipping) underneath the structure
Principle
- Reinforcing, forming and casting in the stationary production facility
- Post-tenstioning of the new cycle and the existing superstructure with tendons
- Lowering of the casting yard; the superstructure is advanced by the hydraulic lifting/launching unit
- Next cycle is produced
Formwork Systems & Services
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