TITLE TEXT HERE 4 - 6 Stanhope Gate Basement Demolition and Reconstruction Owing to the sensitive nature and location of the project, Erith produced a hybrid approach of top-down and bottom-up construction methodologies that would allow for the most efficient programme. This was combined with the ability to drive all site vehicles onto and through the site via a top drive-through system to ensure minimal community and environmental disruption. Transport safety was improved by ensuring vehicles did not need to reverse onto the site, but instead follow a drive-in/load/drive out route at ground level. The design, once completed to accommodate these factors, was timed to lap seamlessly in the programme from the completion of the demolition works previously undertaken by Erith. Phase one consisted of piling works involving the installation of: With large diameter piles and depths of up to 5m, works were prepared to install these with a 96t Abi Rotary Rig and 70t Crawler Service Crane. Waterproofing was installed as a CDP incorporating Xypex concrete, FIS bentonite membranes and a cavity wall drainage system. The works involved the maintaining and eventual integration of the Grade 2 Listed façade picked up on new reinforced concrete upstands of the transfer beam, which in turn picks up the new vertical structure at the underside of the lower ground floor level. This was designed to integrate the temporary works capping beams by incorporating them within the reinforcement cage. A considerable amount of temporary works, designed by Erith’s in-house design team Swanton Consulting was also undertaken involving over 50No. separate temporary works designs integrated and managed to ensure the successful completion of the final permanent works for the client. Part of the design work included the design of a steel grillage built atop of the 4 plunge columns to support the tower crane. Given the nature and position of the structure, situated between the Dorchester Apartments and neighbouring Mayfair Properties, Erith undertook a full monitoring and management approach to ensure full monitoring and control was maintained throughout the works. A full logistics package was put in place which, owing to the restricted nature of the project, was implemented to ensure minimal waste, controlled storage of materials on-site and co-ordinated deliveries and traffic management under the CLOCS scheme, with a focus on Just-In-Time management of deliveries to maximise construction efficiency, improving both programme delivery and streamlined use of resources on-site. • 235No. Hard/Soft 750mm Secant Piles • 17No. 900mm Tension Piles • 6No. 1500mm Bearing Piles • 23No. 1500mm & 1800mm Plunge Piles • 17No. Hard/Soft 450mm Restricted access Secant Piles (below façade) Location: Mayfair, London W1K