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CONSISTE EN UNA VIGA EN FORMA DE CANAL, PREFERENTEMENTE DE PERFIL EN "U", CONSTRUIDA DE MORTERO DE CEMENTO U HORMIGON, ARMADO PRETENSADO, CON ESTRIBOS PARA SU COLOCACION Y AMARRE
Procedimento per la realizzazione del rivestimento di gallerie mediante lastre curve prefabbricate in cemento armato con cordonature laterali di difesa