Bridge engineering safety risk assessment scheme
*****The bridge project starts at K0+168 and ends at 0+522. The bridge and approach road works are located in ******. The bridge crosses the river. The main span is 83m+150m+83m prestressed continuous rigid frame. The approach bridge is 1-25m prestressed concrete box girder. The bridge is 354m long and 9m wide. 1 # and 2 # main piers are double thin-walled piers, with the pier height resolution of 53m/50m, and 3 # transition pier is cylindrical pier, with the pier height of 19m. The foundation adopts the pile group structure, in which 1 # and 2 # piers are designed as 5 piles with a diameter of 2.5m, and the pile foundation is 25m long. 3 # transition piers are designed as 4 piles with a diameter of 1.8m, and the pile foundation is 20m long. Gravity U-shaped abutments are used for the abutments on both banks. The pile foundation adopts rock socketed pile, and 3 # transition pier is required to be embedded in moderately weathered bedrock for no less than 8m. The pile foundation of 1 # and 2 # piers shall be embedded in the moderately weathered bedrock for not less than 15m, and the saturated ultimate compressive strength of the bedrock shall not be less than 4.5MPa, and the bedrock shall be complete. The pile foundation concrete is designed as C30, and the underwater pouring method is adopted for concrete pouring.
