PERFECCIONAMIENTOS EN LOS ELEMENTOS DE HORMIGON PRETENSADO MEDIANTE ARMADURAS TENDIDAS ANTES DE HORMIGONAR, ESPECIAL- MENTE TRAVIESAS DE FERROCARRIL.

摘要

A long concrete unit, prestressed by tendons tensioned before concreting, at least one section of which, near the end of the said unit, is submitted to maximum loads, characterized by the fact that at least one improved-bond prestressing tendon is surrounded by spirals located on either side of the zone of maximum tensile stress.