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Technical challenges during design and construction
of the bridges included:
■ The foundations are independent of the railway bridge, and during
construction London Underground became concerned about the
threat from undiscovered unexploded bombs. Special precautions
including hand dug foundations were required to minimise the risk
to Underground tunnels;
■ In the absence of any code guidance to determine the design loads
for ship impact, the foundations, which are independent of the
railway bridge, were designed to withstand the impact of ships
up to 3,000 t;
■ Pedestrian-induced vibration was another concern, highlighted
by severe problems recently experienced on another high-profile
pedestrian bridge across the Thames.The Hungerford bridges
were checked by calculation and by vibration measurements
on site to ensure no such problems would occur;
■ Site management was complicated by the requirement to keep
a pedestrian route open at all times during construction, a
stipulation made by the client from the outset, and achieved
through skilful logistical management.
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