ABSTRACT
A project by Eduardo Torroja made for Orense station platform roofs is presented. This project was never built. The proposed structure employs thin concrete slabs. The arrangement of the structure makes the main mechanism to balance actions that of an isostatic frame with one pillar and a beam. This beam has a section formed by two arches and curved thin sections joined in a thicker central rib. As in other projects for laminar roofs made from 1939 on, small ribs are incorporated on the upper face of the sheets in order to stiffen them. The project is described from the data that is preserved. It is shown that the solution allowed the roof to be made with a reduced amount of material, although more than was the case in the structure that was finally built, which was much less ambitious.
