Key Technology of Construction of the Substructure of the Main Pier Slant Legged Y-Shaped Structure of the Half-Through Tied Arch Bridge
The main bridge of the Dongsheng Bridge construction project in Tongnan District,Chongqing adopts a(59+258+59)m half-through type tied arch bridge,consisting of a diagonal leg'Y'shaped rigid frame system with two main piers and a middle basket tied arch.The slant legged'Y'-shaped structure includes an outward leaning pier body,an approximate inverted trapezoidal gemstone shaped lower crossbeam,an inward leaning multi-dimensional space front and rear cantilever beam(including concrete and steel structural sections),an end crossbeam and upper crossbeam,a composite beam steel main beam,and side span tie bars.The structural design is novel and the construction difficulty is extremely high.This article focuses on the selection and optimization of construction plans as well as key process control measures for the lower crossbeam and front and rear cantilever concrete section structures,hoping to providing reference for similar bridge construction.
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