下穿铁路顶进框架桥基坑管井降水施工工艺

Construction technique of tube well dewatering of foundation pit for jacking frame-bridge in under-cross railway

结合具体实例，介绍了试验场地参数的设置，以及管井的水量计算，阐述了降水井管径的选择方法及水泵泵量的确定，分析了管井降水工艺的施工效果，显示其效果良好。

Combined with practical engineering, the article introduces the setting of test ground＇s parameter and the calculation of tube well＇ s water quantity, illustrates methods to select pipe diameter of dewatering well and to set pump delivery of water pump, and analyzes construction result of dewatering technique of tube well to show its well effect.