Franca de Xira

closed

This project aims to recover 2 sections, belonging to the Vila Franca de Xira Aductor - Telheiras, identified as:SECTION 2-SIDE OF THE BAIRRO DA MATA AND ALHANDRA TUNNELThis section has a total length of 1,600 m divided into 1,380 m to be developed within a gallery and 220m in an open conduit supported by concrete blocks.This section currently suffers from two types of pathologies, one at the level of concrete degradation (tunnel lining and foundations) and another at the level of corrosion existing in the DN 1500 mm steel pipe. We highlight the following main activities to develop in Section 2:Inside the Alhandra tunnel:Slope of the Bairro da Mata:SECTION 3-SÃO JOÃO DOS MONTES STREET:This section has a total length of 620m, currently consisting of a DN 1500 mm conduit in prestressed reinforced concrete. The duct crosses two differentiated zones, a gutter zone (with a visible part and another buried) and a buried duct zone. The stabilization of the gutter is ensured through anchors. However, due to the pathologies that the concrete pipe presents (reduction of coating, efflorescence, oxidation) and the instability of the land in the area of ​​the ditch due to the slope of the slope on which it is located, greater than 20%, the The project considered the replacement of the existing pipeline and the passive stabilization of slopes using micropiles.

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