Municipal engineering and construction: civic buried water (rain or sewage) drainage, utility tunnel, cable protection, checking well, tower crane cofferdam, vertical pile shell.
Usage:
Municipal engineering and construction: civic buried water (rain or sewage) drainage, utility tunnel, cable protection, checking well, tower crane cofferdam, vertical pile shell.
Road and Railway: culvert, passage, bridge, tunnel overhaul, temporary road, leakage well, etc.
Coal mine: minerals transferring pipes, passages for persons and machines, mine shaft, etc.
Public construction: power plan flue pipes, granary, cement bin, gasometer, fermentor, wind, turbine corrugated steel sleeve pipe, etc.
Martial use: military channel, air defence channel, exit channel.
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