23rd February 2021
Ideally situated in the centre of York, just 10 minutes from York St John University amid the mini-metropolis of York City Centre, Grays Wharf offers students stylishly designed, luxury studios.
The seven-storey development houses 223 studios and associated communal areas which included a study area and bike storage. The development achieved a BREEAM ‘Very Good’ rating.
The building was constructed on Continuous Flight Auguring piles with an in situ concrete frame and finished with a masonry envelope. All materials were offloaded from the adjacent highway as there was no plant access to the other three sides. The ground floor was raised above the recommended flood level with a void beneath the ground floor acting as attenuation during times of flooding.
The site was a former bus depot and as a consequence the ground was heavily contaminated with localised hot spots. Tolent employed specialist environmental consultants to identify the hotspots and assist in managing the removal of contaminated areas from site, without risk of contaminating the adjacent waterway.
The multi-storey project was situated just metres away from the canal. Sheet piling was provided under a previous enabling package, however, upon commencement of substructure works the piling was found to be faulty and began to fail. To mitigate this, Tolent worked in collaboration with the client to engage and appoint a piling specialist who removed and replaced the faulty sheet piles whilst works to the new building’s substructures and superstructures took place.
Access was heavily restricted to the area which required piling as works to the main building had already commenced. Tolent worked with the piling specialists to configure a solution to remove and replace piles from a floating pontoon situated in the canal.
Pontoons were lifted into the water via our on-site tower crane, then propelled into the working location using towboats. ‘Spud legs’ (metal poles) were forced downwards into the bed of the waterway, as a means of anchoring, to prevent general movement and drifting of the floating work platforms. Through this method the sheet piles were removed and replaced successfully with no impact on the planned programmes.