Key Technologies Of High Pier Long-span Continuous Rigid Frame Construction Under The Complex Environment

At present,domestic and international long-span continuous rigid frame bridge construction technology has been very mature,and many of this type of bridge,but Hunan Province Zhang Expressway(Triangle Rock Bridge)132.9m larger span curves ultra thin wall section Hollow Bricks continuous Rigid Frame Bridge rare in Highway Bridges,Railway Bureau in our construction also is the first bridge was built.Therefore,in order to solve the ultra-long-span curved pier continuous rigid frame bridge construction technical problems,such rich reserves of bridge construction technology,combined with the engineering characteristics of our ministry triangular rock Main Bridge,using theoretical analysis,field practice,monitoring testing and other methods of scientific research.The results of this study successfully applied Triangle Rock Bridge project,to fill our two limbs become ultra flexible thin-walled hollow section piers and long-span continuous rigid frame construction technology curve blank,social,economic,environmental efficiency significantly,the overall outcome of the application to the domestic advanced level.The major achievements made by this topic including:(1)Studied 1800m~3 bulky caps Concrete Temperature Control technology to solve the problem of massive concrete construction technology temperature control,crack measures;(2)Studied 132.9m high,variable cross-section,hollow thin-walled,flexible pier construction technology,the introduction and development of high pier construction technology of hydraulic climbing form sets and processes to solve the variable section Hollow High Pier Construction Control technical problems,to ensure that the construction quality and safety of structures,high-rise buildings and improved construction techniques;(3)Ultra-high tower crane research foundation displacement technology,saving construction costs,with some innovation;(4)Study design and the use of high-bay pier plus strand jack preload technology to ensure the reliability of load,while improving construction efficiency and reduce construction costs;(5)Study the long-span continuous rigid frame curved linear construction control technology,through numerical simulation analysis,formulation of strict construction monitoring plan and construction program closure section,to ensure the continuous rigid frame alignment system meet the design requirements,etc.The results of this study successfully applied Triangle Rock Bridge project,to fill our two limbs become ultra flexible thin-walled hollow section piers and long-span continuous rigid frame construction technology curve blank,social,economic,environmental efficiency significantly,the overall outcome of the application to the domestic advanced level.