Large culverts made with precast concrete arch-shape elements connected with cast-in-place concrete

摘要

This paper deals with a new constructive system for large culverts using precast concrete elements.rnThe proposed system includes arch-shaped elements for the main structure and wall elements tornretain the earth over this main structure, being all those precast elements connected by cast-in-placernconcrete. The region of arch crowning receives a layer of cast-in-place concrete to providerntransversal distribution of the vehicles concentrated loads and also to increase the cross sectionrnheight. This paper presents the application of the constructive system for a single span of about 11rnmeters. It is a crossing over the railway line, with a total length of 25 meters, in the city of Teresina,rnNorth-eastern part of Brazil. The thickness of the precast arch is 180mm, reaching 300mm in thernregion of the arch crowning. The main features and hypotheses used in the structural design arernpresented. The procedures used for the manufacture of the precast elements and onsite constructionrnare also described.