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CONSTRUCTION


Looking down from the original basement level of the Harley Street house, one can appreciate the 7000 m3


of soil that was removed from site.


props were used to brace the piles and retain the earth either side of the excavations.


To mitigate the scheme’s impact upon our neighbours in Devonshire Mews West, the majority of deliveries and all excavated material came in and out of the site via Harley Street. This strategy was executed by removing the window sashes at the front and rear of the first floor of 141 Harley Street, and removing the door leaves of the existing opening between the rooms.


All frames, architraves, and shutters, remained in place, and were protected


‘‘


during this time. A series of lifting beams connected the gantry and hoarding on Harley Street through to the rear for deliveries. Some 7,000 m3


of excavated


material was removed via over 70 linear metres of interlinked conveyor belts. These belts were very narrow (only 600 mm wide) due to the constraints of the building, and transferred out via the ground floor hallways and though the bay window of the front reception room. During construction, the contractor’s team arranged the excavation process superbly. During this phase an average of 14-15 lorries took around 12-15 m3


of spoil


Dry-packed high-density modular concrete blocks with overlapping joints will prevent protons and neutrons passing through, and will be installed during the fit-out stage


Piling at sub-basement level in order to support the 600 mm thick floor slab, and excavation of the beam transfer level 15.5 m below Harley Street.


away from site each day. This was all carried out within Westminster City Council’s stipulated hours for noisy working on a 2 hours on/2 hours off basis.


Shielding staff and patients Jonathan Farr, Advanced Oncotherapy’s Chief Clinical Officer, said: “The LIGHT system is a linear accelerator comprised of a series of modular accelerating structures and associated power systems. “This means that the particles are accelerated to higher speeds the further they travel along the beam line, and allows for less energy to be generated should the tumour be located in a shallower part of the body. For example, eye treatment only requires about 70 MeV, so would only use the first five or so units, which in turn means that less energy is required, and less energy is ‘dumped’ pre-treatment. The efficiency means that the radiation shielding for the


September 2020 Health Estate Journal 89


©Andy Catterall Photography and Motion


©Andy Catterall Photography and Motion


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