CBS have been engaged by The National Waterways Museum to raise a number of historic boats that had been sunk for over 30 years. These historic craft, many over a hundred years old, require very specialist handling to initially raise them then lift them for onward transportation for storage ashore.
Mossdale was a particularly challenging project taking months to plan and get approval from the engineers and specialist surveyors who are responsible for the conservation of this important vessel.
CBS designed a specialist lifting frame that was certified by LOLER, which consisted of fixing 5 internal RSJ beams, lifted by 5 external RSJ beams, connected by 10 lever hoists with 10 load cells, that allowed the CBS team to make sure that the weight during the lift on each beam was the same. The 5 overhead beams were lifted by wires from a further 3 overhead spreader beams and a further wire from the hook of the 750t mobile crane.
Once Mossdale was lifted, it was then positioned into the 5 A frame supports that the 5 overhead RSJ beams had been made to sit on, on top of the A frames. These were bolted together and Mossdale was then blocked and chocked under its keel to support it until the next phase was developed for its final resting place.
CBS managed the whole process and the National Waterways Museum were delighted that Mossdale was now ashore and securely at rest.