Mechanical Engineering, bridge bearings, structural engineering Specialists In Structural Movement Control
Mechanical Engineers Specialising In Structural Movement Control
Supplied: Fixed Spherical G Series Bearings
Pintle Bearings For Swing Bridges
In year 2000, British Waterways engineers approached Ekspan to discuss and review the options available to them for replacement of their swing bridge pintle bearings. Historically, prior to this, the design originally adopted by British Waterways incorporated the use of highly expensive large bearings made from forged steel or iron castings. The design also incorporated the use of roller and tapered roller races that can be susceptible to the development of surface flats thereby increasing the risk of point loading. This type of bearing also required re-lubrication throughout its life. Any type of roller bearing is also sensitive to the ingress of dirt, so the bearings also required extensive sealing.
Job Brief
Background Information
Project Team
Client: British Waterways
Engineer: British Waterways,
Contractors: Various
Projects: Bells Lane Swing Bridge, Glovers Swing Bridge, Bradley Swing Bridge
Marsh Meadow Swing Bridge, Bethells Bridge, Brigham Bridge, Rimmers Swing Bridge
Start Date: 2000 onwards
Completion Date: Ongoing
Bearings
Ekspan proposed the use of their G series spherical fixed bearings that provide the following advantages:
1. Significant reduction in cost C In most cases, for the required load, the equivalent bearing can be 20 to 30% of the cost of the historic design.
2. Reduced size of bearing C Generally no greater than 40% of the size of the historic original.
3. Reduced maintenance C No re-lubrication is necessary in most situations.
4. Dimpled and greased PTFE is used against a nickel plated male spherical sliding surface to minimize friction and reduce maintenance.
5. Ease of installation C The bearing supplied is a simpler 2-part construction with transit brackets that are removed after installation.
6. No restriction on load capacity C The design principle can be scaled to requirements.
7. Reduced number of designs C Reduced engineering input holds costs to a minimum.
Ekspan's Solution