Twisted reinforced concrete support beam - has beam torsionally twisted or drilled during hardening period until fully set

摘要

The system for production of a twisted type support or beam of pre-stressed concrete. The beam is partic. for use in the tracks of an air cushion type vehicles. A straight beam is twisted by its ends until the requisite degree of twist is achieved. - The concrete beam is drilled or twisted during the hardening off phase of the concrete during a specific time period. The resultant requisite shape is developed after the necessary tensioning forces have been widened during deformation.