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Printed on:Wednesday 11/29/2023 01:00 PM 29C0219/AABF/113489Pageof5 <br />Department of Transportation - Division of Maintenance Structure Maintenance & Investigations <br />7 <br />602 <br />603 <br />604 <br />Alignment (Mechanical) <br />Balance System - Structural <br />Balance System - Mechanical <br />Wear(Electrical) <br />Drive System - Mechanical <br />Wear(Electrical) <br />2 <br />2 <br />2 <br />2 <br />2 <br />2 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />ea. <br />ea. <br />ea. <br />ea. <br />ea. <br />ea. <br /> 0 <br /> 1 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 1 <br /> 0 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br /> 0 <br />MECHANICAL/ELECTRICAL ELEMENT INSPECTION RATINGS AND NOTES <br />9003 <br />9002 <br />9002 <br />MECHANICAL/ELECTRICAL <br />(601) Support System - Mechanical <br />(601-9003) Alignment (Mechanical) <br />(602) Balance System - Structural <br />(603) Balance System - Mechanical <br />(603-9002) Wear(Electrical) <br />(604) Drive System - Mechanical <br />(604-9002) Wear(Electrical) <br />Element DescriptionElem <br />No. <br />Env Total <br />Qty <br />Units <br />CS 1 CS 2 CS 3 CS 4 <br />Qty in each Condition StateDefect/ <br />Prot Defect <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />Non-Routine Inspection Element Notes: <br />The mechanical support system consists of four components: Center Pivot Bearing, End Wedges, Centering Pins, and the Center <br />Wedges. <br />The center bearing consists of a pivot base casting, upper pivot casting, upper bearing disc, lower bearing disc, and retainer ring. All <br />the weight of the swing span is supported by the center bearing during operation. <br />There are two end wedges with live load shoes at each end of the swing span to support the bridge for traffic. Each set of wedges <br />is driven by the gasoline engine. The wedges are pulled and driven via a series of gears, shafts, and cam linkages. <br /> Each centering pin is moved vertically in a guide system by a lever and cable mechanism located in the operator¿s house. The <br />latches are counterweighted and return to the down (engaged) position manually by the operator. Both centering latch systems <br />functioned normally during the inspection. <br />Center wedges are located at the center pier and are driven by the gasoline engine. The wedges are pulled and driven via a series <br />of gears, shafts, and cam linkages. <br />(06/03/2021) All four end wedges have mis-adjusted cranks and connecting rods resulting in poor clearance of the wedges when fully <br />retracted. The south east wedge is rubbing against the wedge seat mounting bolts. The two center wedges have mis-adjusted <br />cranks and connecting rods resulting in poor clearance of the wedges when fully retracted. ** Update (05/10/23) Condition still <br />present. <br />(05/10/23) The end jack gearbox at the center pier has a leaking seal. <br /> Could not remove drain plug at the time of inspection to verify fluid level. <br />(05/10/23) The east wedge drive shaft coupling is misaligned causing the coupler to pinch at the top and open at the bottom during <br />rotation. The output shaft from the gear reducer and it mating shaft need to be realigned. <br />(05/10/23) The southeast wedge rubs on the north east seat during operation. <br />The balance system consists of center pivot pier the balance wheels and track assemblies. No structural defects were observed. <br />(06/03/2021) Balance system consists of six balance wheels (AASHTO a minimum of 8 in current design standards), and track on the <br />pivot pier. <br />(06/03/2021) The mounting plate below the track assembly is bent and deformed throughout the full length of the track. There <br />appears to be pack rust and grout failure under the track mounting plate. This condition has possibly resulted in an untrue balance <br />wheel rail height. The balance wheel track mounting plate should be replaced and the track releveled. **Update (05/10/23) Condition <br />still present <br />Mech/Elect (06/03/2021) The bridge mechanical drive machinery consists of a single gear drive system. Power to the system is <br />provided by a V8 internal combustion engine. Power is transmitted to the turning machinery gearing through a lever operated clutch <br />system that has two positions, forward and reverse. When the clutch is engaged, a bevel gear and pinion set transmit torque from <br />the engine output shaft to the turning machinery. Additionally, there is one more set of bevel gears, three sets of spur gears, and one <br />main drive pinion mating up to the rack gear. The rack is fixed to the pivot pier structure. As the main drive pinion turns about the ring <br />gear, the swing span is opened. All four end wedges and both center wedges are actuated by a common gear and shaft system that <br />connects to the gasoline engine by a lever operated clutch. At the end of the drive lines, each wedge has a crank shaft and <br />connecting rod. Rotation of the wedge crank shafts withdraw or engage the end and center wedges. All four end wedges and the two <br />center wedges engage steel support pedestals fixed to the end and center piers. The end centering pins