The critical path method and path-time analysis, conventionally used for work preparation for formwork activities, only use average activity times per square meter for stripping and erecting formwork as planning parameter without considering the specific geometrical and structural project conditions. Considerable uncertainty therefore surrounds activity times and resource usage and sometimes results in serious financial deviations. To resolve these uncertainties ETH Zurich has developed a new geometrical-path-velocity-time-model (GPVT-model) in cooperation with the scaffolding/formwork manufacturer DOKA. This GPVT-model determines the realistic and optimized path-velocity-time-relation of all major works related to formwork activities under consideration of the real geometrical and structural dimensions of the building based on data empirically collected on different sites. The optimal crew size and the realistic activity duration are then determined as input for the newly developed formwork-selection-process-model. Construction companies can now select the optimal formwork system for the specific project and optimize their manpower resources and minimize their operation costs.
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