Construction substructure

摘要

A substructure for a sports field of the type which can be shifted on glide pads or rollers on a track of a foundation and in which the frame supporting the sports field can be lifted by pairs of hydraulic cylinders to facilitate inspection and maintenance of the structure beneath the frame. A track bridging the inspection and maintenance space can have a wedge-shaped section covering an opening for this space and hydraulically displaceable into and out of position.