span by span construction method
... 皱纹套管||spirally wound sheath 逐跨施工法||span by span construction method 主槽||main channel ...
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移动支架逐跨施工法 span by span method
每跨50米，纵横向预应力体系；采用移动模架法自南向北逐跨施工。
Each span is 50 metres long, which was constructed with span by span method from south to north.
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