IMC is sharing this new Buy America Supplier Scouting opportunity to help the U.S. Department of Transportation (DOT) Federal Highway Administration (FHWA) find U.S. manufacturers who are either currently making this (or similar) item, or who have the capabilities and capacity to make this (or similar) item in response to DOT FHWA needs.
If interested, contact IMC at 800-326-9467. Submissions are due by COB May 21, 2012.
DOT ITEM OPPORTUNITY SYNOPSIS: Federal Highway Administration
Item Designation and Description:
16-inch diameter motor brake, 340lb-weight
13-inch diameter machinery brake, 251lb weight
Transportation System Application:
Moveable Highway Bridge; Vertical Lift Bridge with a lift span of 200 feet that rises 75 feet for a total clearance of 135 feet high tide
Item Class: Mechanical and electromechanical iron and steel components
Item Material(s): Iron and steel components of Motor and Machinery brakes
Item Size: 16” diameter motor brakes, 340lb weight. 13” diameter machinery brakes, 251lb weight
- Brakes shall be spring-set, thruster-reversed, shoe-type brakes with corrosion-resisting fittings
- Thruster motor shall be with built in adjustable time delays for setting; 460 volt, 3-phase, 60 Hertz squirrel cage motor
- Each of the machinery brakes shall be factory set at 4500 feet-pound intermittent
- Motor brakes shall be factory set at 600 foot-pounds intermittent
Likely Manufacturing Processes:
The manufacture of these items involves metal working, including for the item casings, disks, shafts, etc., as well as electromechanical applications associated with the item brakes. Metalworking processes may include machining, including finishing processes; and possibly also casting, forming, and joining.
Technical Data Summary:
- The motor and machinery brakes are used for vertical lift of bridge span to provide a clearance of 135 feet for marine use of the waterways. Bridge design was in accordance with the AASHTO LRFD Moveable Highway Bridge Design specifications.
- The estimated design life of these structures is 75-100 years and in many cases, the actual recorded service life may be in the range of 75 – 160 years.
- The design of the bridge mechanical systems is unique to each structure. This is dependent on the type of moveable structure, the span length, bridge geometry and a number of other factors. Thus the braking system will generally be designed to the unique characteristics of that structure. The bearings, gears, gear reducers, motor brakes, machinery brakes, etc. are very unique mechanical components that are integrated into the design of specific structures.
- Items must be factory manufactured and calibrated to specific size, capacity, and torque.
Potential Future Procurement:
- There are 839 known moveable bridges in the U.S., and many of these are in the planning stages for rehabilitation and would require motor and machinery brake replacements.
- FHWA previously approved Buy America waivers for motor/machinery brakes for: Florida DOT 2008 and 2010,
North Carolina DOT 2008, New York State DOT 2008, Illinois 2011
- Some public agencies may elect to replace the moveable bridge with a high level fixed-span structure when considering rehabilitation or replacement options. The cost of operating a moveable bridge is very high compared to the operational / maintenance costs of other structure types.
- In some instances, public agencies may consider replacing the existing braking systems with hydraulic brakes if appropriate.
- The cost of the mechanical and brake systems may exceed the 0.1% of contract value Buy America threshold but are relatively low in comparison with other bridge construction costs (sample costs are included below).
- The lead-time for manufacturing and furnishing the mechanical system components for movable bridges is frequently very short. Many of these bridges are in urban locations and the construction contracts typically are on an accelerated schedule.