Key Construction Technology and Design of Large-size Pile Foundation Cap and Steel Sleeve Box Cofferdam
Aiming at the problems of complex hydrological conditions of deep foundation and poor precision of conventional underwater construction of Beichengzi River Bridge,we put forward the structural safety design method of water pressure resistance of steel coffer-dam assembly,and researched the construction methods of precise installation and positioning of underwater steel cofferdam and con-crete drainage pouring,etc.The research shows that:the use of 8 mm-thickness steel plate combined with[10 channel steel reinfor-cing rib structural system can ensure the capacity of the cofferdam water pressure resistance;and the use of hierarchical numbering and positioning method of underwater steel cofferdam installation ensures that the error of the underwater installation can be controlled with-in±20 mm.
construction of cushion capsteel boxed cofferdamforce analysisconstruction safety
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