Sports arena, with playing field, uses buoyancy drives at field corners below to raise field to roof level by drives connected to field supporting structure

摘要

The playing field (1) can be raised to roof (4) level by submounted drive (8) composed of a lifting body (10) in a liquid buoyancy medium, the body connected to the playing field. Four drives (8) are allocated to the field corners at a specified distance below the field surface. As vertically projected onto the adjoining long field edge, the drive in question is spaced from the field surface by 10-30% of the field longside length. The drive has a vertical shaft below the field containing drive body medium and the field has its own supporting structure (26) connected to the drive body (5) by jack leg (18).