无工作室管棚
pipe roof installed without working chamber
construction technology
管棚环向间距
space in the circumferential direction
管棚超前支护
the pipeline shed advance timbering
大管棚
Shed
large piep shed
Big pipe shed
big pipe fence
large pipe roof
huge pipe roof reinforcement
leading steel pipeline shed
large pipe shed
Large Pipe-roof
big tube cote
large pipe
steel sheet pile
steel tube shed
big size shed-pipe
超前管棚支护
leading shed-pipe supporting
advance fore poling
Advance pipe-roofing
超前管棚预支护
shed-pipe advanced support