Construction Technology of Steel Strand Backtension Preloading for Long-span Continuous Rigid-frame Bridge 0# and 1# Block Brackets
It is more common for the 0# and 1# blocks of the continuous rigid-frame bridge to be constructed by the bracket method,and the 0# and 1# blocks are the foundation sections of the whole bridge construction.The main characteristics are high cross-section and large weight,so the bracket must be preloaded after erected in order to verify its safety.And the deformation data of the bracket are obtained so as to set the precamber.Combined with the engineering examples,the construction technology of steel strand backtension preloading for the continuous rigid-frame bridge 0# and 1# block brackets is introduced,and the focus is on the selection of steel strands and finished rolled rebar,the installation of the backtension preloading system of steel strands,and the measures of tension and compression,load holding and unloading of steel strands.The scientific and effective bracket deformation data are obtained,which provides a basis for the setting of the precamber of the bridge and a reference for the construction of similar bridge projects in the future.
continuous rigid frame0# and 1# blocksbracketsteel strand backtensionpreload
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