Poole Bridge Approach Spans
The project comprises the replacement of approach spans to Poole Bridge, which crosses Poole Harbour. The bridge is a bascule lifting bridge, constructed in 1927, and crosses Poole Harbour SPA, SSSI, RAMSAR site, and is locally listed and adjacent to a conservation zone, and is in a PSPA site (Proposed Special Protection Area). The existing approach spans have previously been modified. The replacement approach spans will be supported on new piles, with new abutments constructed.
The bridge is approximately 92m long comprising of a double leaf rolling bascule bridge built in 1927 spanning the main channel. Approach spans are located either side.
Twin trusses made up of rolled steel sections form the lifting leaves which each have 5 transverse cross girders which carries the steel deck troughing. The ends of the lifting spans are supported on a grillage of plate girders (track spans) with these bearing onto the main caissons. A steel cantilever footway measuring between 1.8m and 3.7m wide is fixed to the end of each transverse cross girder.
The approach spans are constructed from insitu concrete beams and integral slabs in the Hennebique style. They are supported at intermediate positions on universal steel beam sections which span between concrete filled steel piles. The steel beams and piles are later modifications carried out in response to deterioration of the original concrete substructure and later assessment of the deck. A 1.5m wide concrete cantilever footway either side completes the approach spans.
The works involve:-
• Demolition and removal of the existing approach spans, which comprise a concrete slab supported on structural steel work
• Demolition of the existing concrete abutments.
• Removal of existing cantilevered footways from lifting leaves and track spans
• New abutments, tying into existing quayside walling
• New Replacement piles
• New cantilevered footways on the lifting leaves
• Relocation of existing International Association of Lighthouse Authorities
• (IALA) Lights
• New pedestrian and vehicular wig wags.
• New vehicle restraint system on approach spans.
• New lighting scheme.
• An option to install a new control system
Works on behalf of the RNLI are also included as an option. These works
comprise removal of existing piles and installing new piles for a new floating bearth for life boats.
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