29C0108_AABF_2025-APR - Laserfiche WebLink

Home Browse Search

Printed on:Wednesday 05/28/2025 06:29 AM 29C0108/AABF/149448Pageof8 Department of Transportation - Division of Maintenance Structure Maintenance & Investigations 11 601 602 603 604 Support System - Mechanical Lubrication Balance System - Structural Balance System - Mechanical Drive System - Mechanical Lubrication 2 2 2 2 2 2 1 1 1 1 1 1 ea. ea. ea. ea. ea. ea. 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 MECHANICAL/ELECTRICAL ELEMENT INSPECTION RATINGS AND NOTES 9001 9001 MECHANICAL/ELECTRICAL (601) Support System - Mechanical (601-9001) Lubrication (602) Balance System - Structural (603) Balance System - Mechanical (604) Drive System - Mechanical Element DescriptionElem No. Env Total Qty Units CS 1 CS 2 CS 3 CS 4 Qty in each Condition StateDefect/ Prot Defect Non-Routine Inspection Element Notes: Non-Routine Inspection Element Notes: Non-Routine Inspection Element Notes: Non-Routine Inspection Element Notes: Non-Routine Inspection Element Notes: The mechanical support system consists of a center bearing, center wedges, end jacks, bridge seats, and end locks. The center bearing assembly consists of a 4¿ square concrete base, lower pivot casing, lower bearing disc, upper bearing disc, and upper bearing casing. Centering wedges for supporting live loads are located on each side of the pivot pier. Each center wedge assemblies consists of a self-contained hydraulic power unit that drives a piston that operates a bell crank to pull and push the wedge. There are three hydraulically driven end jacks at each end of the swing span that raise the bridge so the sliding bearings seats can retract. There are three hydraulically driven bearing seats or support bars with live load shoes at each end of the swing span to support the bridge for traffic. These bearing are retracted prior to swinging the bridge. Centering locks are located at the middle of each rest pier. The center locks are hydraulically driven and engage a receiver on each end of the swing span. Mech/Elect (06/01/2021) There is no indication when the center bearing oil was last replaced. Drain the oil and have it analyzed. Refill the bearing with new oil and note the replacement date. There is no site glass to visually check oil level, center bearing may be empty. (5/8/23) Condition still present. The West end support bars are not moving into position smoothly, they hang up then move quickly and slam into the limit switches. Lubricate the support bar yokes until the support bars move continuously. (5/8/23) Condition still present. The balance system consists of center pivot pier the balance wheels and track assemblies. The mechanical balance system consists of eight, 15¿ balance wheels and track on the pivot pier. The mechanical drive systems consist of three types: The main bridge swing drive system, located on the center pivot pier, the end jack hydraulic drive system that operates the bridge jacks, seats, and center locks located on the west and east fixed spans, and the hydraulic center wedge drives. The east rack drive pinion may have slipped down 1/2". The shaft is shinny and the pinion and rack gear do not align. Monitor to see if condition worsens. If the pinion continues to slip, replace pillow block bearings and realign pinion. The main drive motor is a 25 HP 1175 RPM 326TDZ frame, with Eaton Variable Speed Drive. The gear reducer is Brad Foote Gear Works size 3PH1200-DF, 1100 RPM input, 38.6:1 gear reduction. The machinery brake is drum type affixed to the highspeed output side of the parallel gear reducer. The brake is thruster actuated by a Mondel 10MSY/E-ED23/5S actuator. The right-angle gear reducers are Brad Foote Gear Works size 2 RV1200-D, 28.5 input RPM, 7.79:1 ratio. The gearboxes transfer power from the main gear reducer through input shafts and out at 90-degree angles to the main drive pinions on opposite sides of the ring gear. There are two drive shafts that transfer power from the main gear reducer to the right-angle reducers. There are two output shafts from the right-angle reducers to the main drive pinions. There are two drive pinions that rotate the bridge around a center ring gear. The center wedges are each driven by a self-contained Sheffer Powr-Pak Model 35S01-82 1.5 HP hydraulic motor and drive piston. The end jack hydraulic system is the same on each side of the swing span. The system consists of the hydraulic pump and reservoir tank, control and pressure relief valves, and the hydraulic piping. The pump is a 10 HP 1745 RPM