大风区大跨高墩现浇支架方案比选与设计及研究

Comparison on Cast-in-place Support Scheme of Large-span High-pier in Windy Area and Its Design

平潭海峡公铁两用大桥(D0~D23)处于大练岛的山凹之间,受穿堂风的影响,大跨高墩支架现浇梁施工安全风险大、施工工效低、工期紧、成本高。为了克服大风条件造成的现浇梁施工困难,本文通过三种方案综合工期安排、施工工艺、经济性等多方面对比分析进行方案比选,并从理论分析、数值模拟、现场试验对大跨高墩现浇支架研究分析论证,确保大跨高墩现浇梁的顺利建设,为以后类似工程提供经验。

The Pingtan Strait highway and railway combined bridge (DO ~ D23) locates between the cove of Dalian Island, affected by the draught wind, some problems were occurred to the large-span high pier support cast-in-place beam construction, such as high safety risk, low construction efficiency, tight schedule and big cost. In order to overcome construction difficulties of cast-in-place beam caused by the windy conditions, in this paper, three kinds of schemes were compared, in light of the schedule arrangement, construction technology and economy. And, it was demonstrated for large-span high pier cast-in- place support from theoretical analysis, numerical simulation and field test to ensure the successful completing of large-span high-pier cast-in-place beam, which could provide experience for future simitar projects.