求翻译：2）超前长管棚施工是什么意思？

2) ahead of a long pipe roof construction

2) long tube scaffolding works ahead

2) in advance long tube awning construction

2) advance long pipe roof construction

The ductule extrapolates in advance the angle according to the design construction, the logical circuit median line direction becomes certain angle arrangement approximately.Kong Weizuan supposes the deviation not to surpass 10cm, the perforation coarsening is long in the ductule, the steel crown en