Amazing Structure Spinnaker Tower
The Spinnaker Tower is a £35million, UK Millennium Commission sponsored project aimed at transforming the waterfront of Portsmouth and Gosport. It forms the focal point of a £200M regeneration of the Portsmouth Harbour area and adds a new international landmark to the South Coast of Britain.
Overview
- Spinnaker Tower is a concrete, steel and composite structure that rises 170m from the sea adjacent to Gunwharf Quays. It has three tourist viewing platforms at heights of 100, 105 and 110m that offer extensive views over Portsmouth harbour and beyond.
- It is constructed upon a 3m thick pile cap and founded on 84 piles, and comprises two inclined slip-formed hexagonal concrete shafts, of 6m across, which merge into a single shaft at 70m. One shaft contains an internal express lift and the other shaft carries a panoramic external lift up the seaward face.
- Two elegant crossed bows, fabricated from 10.8m long and 1.5m wide structural steel box sections, rise from the ground, cross between the shafts at 35m and rise to connect with the shaft at 120m. The bow dimensions vary from 10-12m in depth at the base and top of the tower, reducing to 2.5m wide in the central region. Aerofoil shaped ribs span between the bows to give the distinctive ‘Spinnaker’ sail appearance.
- A composite spire forms the needle-like top to the concrete A-frame.
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