青盐铁路淮河入海水道特大桥主桥桥式方案研究

Study on Main Bridge Type Scheme of Huaihe River Sea-Entering Channel Super Bridge of Qingdao-Yancheng Railway

青盐铁路淮河入海水道特大桥跨淮河入海水道、苏北灌溉总渠、省道S328,考虑防洪、通航、立交要求的同时兼顾淮河入海水道二期规划等控制因素,从技术特点及施工难度、可维护性、环保、景观、工期、经济性等方面对桥式方案进行对比分析,结果表明主桥采用(73+2×128+73)m连续梁+(73+4×128+73)m连续梁方案最优。推荐采用的长联大跨混凝土连续梁,具有传力构造简单、整体性好,施工工艺成熟、施工干扰少、后期维护少及经济性佳等优点,为类似跨度桥梁在相同区域或类似地质条件下的应用提供借鉴及参考。

The Huaihe River Sea-entering Channel Super Major Bridge of Qingdao-Yancheng Railway across the Huaihe River Sea-entering Channel,North Jiangsu Irrigation Canal and S328 provincial highway,considering the requirements of flood control,navigation,overpass and it is necessary to take into account the control factors such as the second phase planning of Huaihe River seaward waterway.It is comparatively analyzed in the paper that the bridge type scheme from the aspects of technical characteristics,engineering construction and maintainability,environmental protection,landscape,construction period,economy and so on,and the results show that the scheme of(73+2×128+73)m continuous beam+(73+4×128+73)m continuous beam is the best for the main bridge.The recommended long-span concrete continuous beam has the advantages of simple force transmission structure,good integrity,mature construction technology,less construction interference,less late maintenance and good economy,which provides reference for the application of similar span bridges in the same area or under similar geological conditions.