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上海铁路局杭州工程段为适应软土桥基的施工,学习了铁道部第四设计院软土队用水冲法打砂井的施工经验,自制了二套冲砂井机具,
In order to adapt to the construction of soft soil bridge abutment, Shanghai Railway Bureau Hangzhou Engineering Section learned the construction experience of soft soil water sand blasting of the Fourth Design Institute of the Ministry of Railways, and made two sets of red sand well machines,