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介绍沪宁高速软土地基地区,桥梁拼接加宽施工技术。沪宁高速沿线软基路段较长,桥梁基础沉降量是新、旧桥梁横向拼接的关键,对此采用桩底压浆措施,控制新、旧桥梁基础沉降差值在5 mm以内;上部结构拼接通过植筋满足结构受力传递要求;拼接部位采用UEA膨胀剂配制的补偿收缩混凝土,对解决速裂、抗裂、防渗起到了很好的效果,科学合理的接长桥头斜伸缩缝等措施,保证了新老桥梁的拼接效果。
Introducing Shanghai-Nanjing high-speed soft foundation area, bridge splicing widening construction technology. The soft foundation sections along the Shanghai-Nanjing Expressway are long, and the settlement of the bridge foundation is the key to the new splicing of new and old bridges. For this, the pile bottom grouting measures are adopted to control the settlement difference of new and old bridges within 5 mm. The superstructure splicing Through the anchorage to meet the requirements of the structure of the transmission of force; splicing site using UEA expansion agent prepared by the shrinkage of concrete, to solve the crack, crack, seepage has played a very good effect, scientific and reasonable measures such as the Diagonal expansion joints , To ensure that the new old bridge splicing effect.