The two gantry cranes on I-481 are an engineering solution to a tricky construction dilemma. Picture two existing 2,100-foot ...
Crews used a boat with a large crane to lift the drill out of the water Jan. 28, ending a seven-month long dig, Clackamas County spokesperson Scott Anderson said in a press release Tuesday.
Enter the gantry cranes. These cranes have wheels taller than a person. Two cranes will roll over the lanes with one wheel on ...
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