Precast Components For Government Project
Modernising and strengthening the existing middle slip jetty at Portsmouth Naval Base which will be capable of mooring the Royal Navy’s new flagship, HMS Queen Elizabeth required a special solution.
Main contractor Volker Stevin has demolished the old 1920s jetty – comprising 1m thick concrete supported on a complex lattice frame.
The new precast jetty is being constructed on reinforced tubular piles driven into the bed of the dock basin. It comprises a number of custom-designed precast components, produced by Kijlstra’s UK factory using moulds made for the purpose by specialist suppliers in the Netherlands.
The cruciform and transverse beams support the 205 reinforced concrete planks which complete the upper surface of the jetty. There are also 24 precast concrete pile-caps, some of which, says Rupert, are among the most complex components he has ever had to produce.
There are 16 fender pile-caps comprising two types. The smaller ones weigh 32 tonnes; the larger ones weigh 50.2 tonnes.
says Kijlstra’s production manager, Rupert Treadaway.
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