近日，中铁上海局“采用顶拉结合在软土中铺设大直径管道”施工方法获国家发明专利授权。该技术运用了水平定向钻机的回拖力给敞开式、部分敞开式顶管的工具管提供牵引力，引导工具管沿设计轴线前进；顶管工作坑中的千斤顶为管道沿着工具管形成的轴线前进提供顶力，使管道往前延伸，可减少支护材料，降低施工机械费用，施工中的工具管还可重复利用。
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