Balanced cantilever erection with lifting frames
VSL continuously develops new lifting solutions applicable to balanced cantilever erection. VSL strand lifting units, incorporating multiple safety features, are utilised for these solutions, providing a large range of lifting capacities, whilst allowing precise placing of segments. The delivery of segments to the place of installation basically influences the selection of cantilever erection method. For projects with considerable delivery constraints, VSL has successfully started to use the balanced cantilever erection with lifting frames.
Following assembly, installation and commissioning by suitable cranes, VSL lifting frames can operate independently. They are equipped with work platforms providing unlimited access to all necessary erection fronts. Furthermore, they incorporate two primary hydraulic systems providing both lifting of segments and moving of the frame itself during construction. When high lifting speeds are required, generally greater than 20 m/h, tandem lifting units or winch systems are utilised on lifting frames. VSL technical centres typically work with engineers to incorporate limiting aspects given by the lifting system into the permanent structure design, to ensure suitable load introduction into the permanent structure and also provide the structure analysis, geometry control and pre-camber calculation in all phases of construction. VSL regularly achieves erection cycle of two pairs of segments per shift.