This occupation is included in the larger group of pipelayingfitters, pipefitters, and plumbers.. The median wage for this groupis $4,781 per month ($27.58 per hour). Half of all of these workersearn between $3,602 and $5,651 per month ($20.78 and $32.60per hour).
When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on.
For the suspension bridge design, the main span was to be 1,750 feet, flanked by side spans of 719 feet. For the cantilever bridge design, the main span was also to be 1,750 feet, but was to be flanked by shorter side spans of 500 feet. Both bridges were to have mid-span clearances of 135 feet over mean high water. By 1922, Modjeski's suspension design was approved by the Delaware River Bridge Joint Commission.