ABSTRACT
This paper aims to present the solutions for excavation, peripheral earth retaining walls and centenary facades underpinning of a future residential building, located in Estoril, Cascais, Portugal. Firstly, to preserve the building´s facades, a temporary structural system was installed, allowing the facades bracing, ensured by the execution of horizontal steel distribution beams and vertical steel frames, founded on vertical micropiles. Secondly, the facades were underpinned through the execution of two twin underpinning beams, connected by pre-stressed bars, founded also on vertical micropiles. For the execution of the underground floors, it was necessary to excavate a maximum of 9 m under the original building´s foundations, using the king post walls earth retaining technique braced horizontally by steel props, ensuring the compatibility of the underpinning and the retaining facades solutions. Lastly, the monitoring and observation of the peripheral retaining structure and facades is also pointed out, encompassing detailed analyses and comparisons with the initially estimated values from the design phase.
