The Yongjiang grand bridge, which is a pivotal project in Nanning is constructed near the existing line. The "weir before pile" method is used in water pier construction. In treatment of cofferdam river bedrock, instead of the conventional underwater blasting method, a simple and practical method is adopted, which provides new options for handling similar problems.%南宁枢纽工程邕江特大桥临近既有线施工，在水中墩进行“先堰后桩”法施工中，围堰河床基岩的处理中，摒弃常规的水下爆破方法，采用一种简单实用的方法，为我们处理类似问题又多了一个新选项。
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