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After considering site environments, the Pneumatic caisson
method which did not require a temporary cofferdam was used
to construct foundations of main towers. For piers of the
truss bridge and the steel box girder bridge, Cast-in-place
concrete piles with diameter of 1500mm and 1000mm were used
in combination with temporary cofferdam. Depending on the
sites, steel pipe sheet pile method, steel caisson cofferdam
method, sheet pile method was used to construct the cofferdam.
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Concrete of main towers and
piers was cast using a batcher plant(B/P) ship. For some expansive
foundations, a pipe-cooling system was employed to regulate
the heat of hydration. To prevent damage of concrete by salt,
sulfur resting cement and salt proof coating was applied.
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