Prefabricated reinforced-concrete shell

摘要

The invention relates to a prefabricated reinforced-concrete shell which is rectangular in outline, is curved in the form of an arc in longitudinal section and, in cross-section, is curved symmetrically in the form of a channel or in the form of a V, with respect to the longitudinal axis, having curved V-legs. The shell is reinforced with reinforcing mats and tensioning elements which run, with a predetermined tensioning force, from shell end side to shell end side and are embedded in the reinforced-concrete body. The reinforced-concrete body is set up and designed to be mounted, in the region of the shell end sides, on bearing means which are to be arranged. The reinforced-concrete bodies are prefabricated, with the embedded tensioning elements in the form of non-interconnected individual tensioning members, as reinforced-concrete bodies which have untensioned reinforcement and a predetermined longitudinal curvature corresponding to the shuttering. The individual tensioning members each comprise a tension member and a sheath which is embedded in the reinforced-concrete body and in which the tension member can be displaced. The tensioning is, however, such that the reinforced-concrete body is excessively curved, with respect to the longitudinal curvature predetermined by the shuttering, by the tensioning force of the individual tensioning members. Excessive curvature is intended to mean an arcuate curvature, the curvature radius of which is smaller than the curvature radius of the longitudinal curvature corresponding to the shuttering. <IMAGE>