A buried steel pipe is mostly to blame for stopping the giant tunnel-boring machine Bertha, which has been stuck since Dec. 6 along the Seattle waterfront near South Main Street. The long pipe was an ...
State officials revealed Friday that the mystery object blocking tunnel machine Bertha is a long steel pipe, left buried in 2002 by one of the Highway 99 project’s own research crews. The tunnel drill ...
Long-distance conveyors are a reliable and energy-efficient method of bulk material transport. Pipe conveyors—fully enclosed material handling systems—offer additional environmental protection and ...
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