Fugro has announced that it saved time, cost and congestion during recent overwater ground investigation schemes on the Tideway project for Ferrovial Agroman and Laing O’Rourke.
The company has said that adaptations to its Skate 2D jack-up platform enabled these savings to be delivered on the scheme despite it involving 55 bridge manoeuvres.
The seven month long project involved drilling boreholes to 80m with insitu testing and downhole geophysics to provide ground risk and engineering data over a 10km stretch of the Thames.
According to Fugro, efficiency in cycle-time and river transit in tidal waters was crucial in delivering information to suit the phasing of planning and design and this demand led to the platform innovation.
The conventional method when passing under bridges involves a support barge and crane to install, remove and transport the platform legs. Reconfiguring the deck to accommodate a crane enabled Fugro to carry out the handling and storage of platform legs on the vessel, eliminating the need for an additional barge. A full suite of geotechnical drilling, sampling and testing equipment, that could be mechanically folded, was also carried.
Fugro’s self-removing leg system, with the addition of the onboard storage cradle, is believed to be a first for a modular jack-up platform undertaking geotechnical work on the river.
Fugro nearshore site investigation specialist Matt Chappell said: “Our uniquely designed platform simplified logistical and health and safety management risks for the complex transits and bridge manoeuvres, improving efficiency and reducing supply chain risk. It also reduced the cost to the client by eliminating the need for a support barge together with associated standing time incurred from tidal delays.”