【摘要】 厦漳跨海大桥北汊南引桥为海中长引桥,结合桥位处地震烈度高、地质情况复杂等特点对桥梁结构体系、桩基类型、上部结构设计施工方案进行比选。通过比选研究,桥梁选用整体性能好、结构刚度大、变形小、抗震性能好的预应力混凝土连续梁桥。由于桥位为典型的球状风化花岗岩地质,且水深较浅,不宜采用打桩船施工混凝土管桩,因而桩基类型选用钻孔灌注桩。上部结构设计施工比选方案为:移动模架法施工50m连续箱梁、短线法节段预制拼装施工70m连续箱梁、前两种方案组合,综合考虑工期、景观效果、施工难易程度,确定采用短线法节段预制拼装施工70m连续箱梁+移动模架法施工50m连续箱梁方案。更多还原

【Abstract】 The south approach of the north bridge of Xiazhang Sea-Crossing Bridge is designed as a long approach bridge standing in the sea.Given the high seismic intensity and complex geological conditions at the bridge site,the structural system of the bridge,pile foundation forms and the design and construction schemes for the superstructure were compared and selected.Based on the study,the type of prestressed concrete continuous girder bridge which exhibits sound overall performance,excellent structural stiffness,minor deformation and good anti-seismic performance was chosen.The typical spherical decomposed granites can be found at the bridge site and the water level there is low,the floating pile-driver is not applicable to the construction of the concrete tubular piles.Therefore,the bored piles are chosen for the pile foundations.The two design and construction schemes for the superstructure were compared,including the application of movable formwork to construct the 50mlong continuous box girder segments and the short-line method to prefabricate and the segmental assembling method to assemble the 70mlong continuous box girder segments as well as the combined application of the former and the latter.Based on the combined consideration of construction schedule,landscape effect,and degree of complexity in construction,it was determined to adopt the scheme of using short-line method to prefabricate and the segmental assembling method to assemble the 70mlong continuous box girder segments and the movable formwork to construct the 50mlong continuous box girder segments.更多还原