Located in a busy area of west London, 375 Kensington High Street was a residential scheme carried out in two phases by Carey Group companies Scudder Demolition and Careys Civil Engineering. The first phase of works entailed demolition of Charles House, after which Careys undertook construction of a two-storey underground car park. A major rail line ran along the western boundary of the site, requiring close liaison with Network Rail throughout the project.
The busy urban environment of the site, situated on the corner of Kensington High Street and Warwick Road, presented a significant challenge to the project team during the planning stages of the project. The 12,000m2 site would require excavation of more than 100,000m3 of earth for the new car park, in addition to the material removed after demolition works were completed.
Consequently, our team deployed number measures on site, including a detailed traffic management plan, to prevent disruption to local stakeholders from site congestion.
In addition to this, the presence of a major, live rail line along one boundary of the site required extensive liaison and reviews with Network Rail to obtain permissions to conduct work. Our team worked closely with one of the company’s asset protection project managers who provided specialist advice on the technical and administrative issues related to working alongside a rail asset, requiring extensive planning to ensure compliance with stringent safety and engineering criteria.
Works began on site with set-up operations, a complete soft strip of the structure and the erection of scaffolding by Scudder, followed by demolition of the existing sub and superstructures. To mitigate the effects of the demolition work, the building was encased with monarflex sheeting to reduce the effects of noise and dust on the surrounding community. In addition to this, we installed a vibration monitoring system with audiovisual early warning alarms to ensure the gas and water mains were safeguarded at all times.
With the successful completion of Phase 1, Careys Civil Engineering was awarded the second phase of works which entailed the demolition of a vacant stand-alone public house (The Radnor Arms) on the Warwick road elevation of the site, installation of sheet piling to the north of the site to enable excavation and formation of piling mats for both the sheet piling subcontractor and the secant piling subcontractor.
In addition to this, our team undertook excavation of the new two-storey basement, forming the raft slab which included embedded site drainage at the same time to reduce overall programme time. Our team also complete 35, 400m3 concrete pours under restricted working hours and installed an electronic zoning system on site cranes to prevent lifts being undertaken directly above the rail line.
Once excavation works were completed, our team formed a reinforced concrete liner wall around the secant pile and constructed the lift, stairs and stairs cores between the ground floor and bottom of the basement.
The presence of a live gas main on Warwick Road also presented a challenge, with the team using a specialist piling rig to reduce ground vibration and prevent damage to the asset.
This second phase works commenced early, demonstrating the benefits of the Carey Group approach to managing the interface between demolition and civil engineering packages. The early commencement of these works ensured the client could realise ambitious target handover dates for sales release of the apartments.