How Mechanical SPIDERS SPIN Bay Bridge Cables

1930년대 완공된 San Francisco-Oakland Bay Bridge의 케이블 시공 방법.

This article describes in simple language how a wire long enough to encircle the world three times is carried back and forth across San Francisco Bay by traveling wheels to spin the suspension cables of the world’s longest structure, the mammoth San Francisco-Oakland Bay Bridge.

BY FAR the most spectacular operation in the construction of a suspension bridge is the spinning of the mighty cables which loop gracefully from tower to tower, supporting a roadway hung far below. How are these mile-long cables, each weighing 9,500 tons and containing 17,464 strands of steel, being stretched from tower to tower for the San Francisco-Oakland Bay suspension bridge?