SOLUTION

To complete the investigation of the counterweight system, WJE documented the number and location of concrete blocks, cored the counterweights to determine void locations, performed instrumentation of the operating rope turnbuckles and pinion shafts to measure span imbalance, and inspected the live load bearings and guide rollers to verify operation and condition. WJE recommended removal of some concrete blocks to adjust the counterweight balance. WJE engaged a local mobile welding service and certified welder to complete weld repairs to the damaged columns. To prevent future guide wheel binding or derailment, shims behind the guide rails were adjusted under WJE's direction to maintain even guide wheel contact the full height of the tower. Through high-precision laser alignment checks of the lift span shafts, drums and operating ropes, WJE concluded that regular lubrication of all mechanical system and operating ropes components would reduce wear and recommended repairs for the damaged and aging breaks, pinions, couplings, deflector sheaves, and ropes. WJE also developed a fitness for purpose evaluation of the existing sheave/trunnion assemblies using ultrasonic test methods so that these fracture critical elements can be routinely inspected.