C.M. Vila Franca de Xira
Castanheira do Ribatejo, Portugal
The assessment of a bridge on the Vala do Carregado, regarding its final design project, was developed for the Vila Franca de Xira City Council. This structure will replace the existing bridge at approximately the same location, in the Castanheira do Ribatejo area.
The main reasons for the construction of this structure are the following:
- Widening, in about 10m, of the Vala do Carregado in order to reduce the constraints in the discharge capacity of the river. This requirement is included in the preliminary design of the fluvial regularization of the river stream and it led to an increase of the span for the existing bridge.
- An expected substantial increment of the heavy freight traffic in medium term, as a result of the construction and subsequent operation of the North Lisbon Logistic Centre, in Castanheira do Ribatejo.
The proposed solution for the bridge consists of a single span structure, with a total length of 30m, consisting of two WARREN lattice girders spaced 10,4m apart. These girders are the support of a lower deck with a composite structure 13,8m wide.