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广东江番高速公路与高压电塔部分共线段因受外界因素限制,下部采用倒T大悬臂盖梁结构(以下简称大悬臂盖梁),此结构既满足了高压电塔桩基与桥梁桩基最小桩间净距的要求,同时能满足中山市北二环在桥下共线并行的要求。大悬臂盖梁标准悬臂尺寸11.325m,最大悬臂尺寸达12.654m,超过此悬臂尺寸盖梁额外增加了辅助墩。施工过程中预应力钢束须分多批次张拉,对于加设辅助墩的盖梁尤其注意避免负反力的出现。
Due to external factors, the common section of Guangdong Jiangfan Expressway and high-voltage electric tower is limited by the external factors, and the inverted T large cantilever cover beam structure (hereinafter referred to as the large cantilever cover beam) is adopted in the lower part. This structure not only meets the requirements of high- Pile spacing between the minimum clearance between the piles at the same time to meet the Zhongshan City, North Second Ring collinear parallel under the bridge requirements. Large cantilever beam standard cantilever beam size 11.325m, the maximum cantilever size of 12.654m, beyond the cantilever size additional additional pier beam cover. During the construction process, the prestressing tendons should be tensioned in multiple batches, with special attention to avoiding the appearance of negative reaction force for the girder with additional abutment.