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Giant `mole' speeds mangla's five diversion tunnels
Five 36-ft diam tunnels spaced 75 ft apart, center to center, and splaying to 130 ft apart at power house portal driven 1650 ft through hill, making up left abutment of 75 million cu yd Mangla Dam; speedy completion of tunnels before monsoon rain run-off made possible with specially designed machine; self-propelled jumbo with 36 ft 8 in. diam cutting disk revolved slowly by electric motors; cutters on cutter head abraid tunnel facing, muck is simultaneously picked up by head, then discharged through jumbo conveyor; mole is so designed and constructed to install ring beam tunnel supports as tunneling progresses; ten 100 hp Electric-Dynamic three-speed motors rotate cutter head; each motor drives through double planetary gear, permitting smooth exertion of million foot-pounds of torque as cutter head rotates at 1 rpm.
Giant `mole' speeds mangla's five diversion tunnels
Five 36-ft diam tunnels spaced 75 ft apart, center to center, and splaying to 130 ft apart at power house portal driven 1650 ft through hill, making up left abutment of 75 million cu yd Mangla Dam; speedy completion of tunnels before monsoon rain run-off made possible with specially designed machine; self-propelled jumbo with 36 ft 8 in. diam cutting disk revolved slowly by electric motors; cutters on cutter head abraid tunnel facing, muck is simultaneously picked up by head, then discharged through jumbo conveyor; mole is so designed and constructed to install ring beam tunnel supports as tunneling progresses; ten 100 hp Electric-Dynamic three-speed motors rotate cutter head; each motor drives through double planetary gear, permitting smooth exertion of million foot-pounds of torque as cutter head rotates at 1 rpm.
Giant `mole' speeds mangla's five diversion tunnels
World Construction
Harder, P.B. (author)
World Construction ; 17
1964
2 pages
Article (Journal)
English
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