Case Studies / Bann River Bridge Bearing Replacement - Coleraine to Londonderry Rail Track

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The Bann River Bridge is a single-track railway bridge, composed of 11 steel girder sections resting on reinforced concrete piers. Constructed in the 1920’s, the bridge has served for nearly 100 years carrying the Coleraine to Derry/ Londonderry line over the River Bann. Innovatively, the bridge features a large bascule type lifting span to allow for the passage of ships below en route to Coleraine Port.

Project Summary

SDG tendered for the design and supply of the replacement

bridge bearings, with Main Contractor and long standing partner,

FP McCann. To date, this has been one of our most technically

demanding projects to work on, due to the shear level of bespoke

design involved in the production of the bearings.

Our Solution

SDG worked closely with Manufacturer GUMBA based in

Germany to design and supply a total of 36 Guided and Free Pot

Bearings in accordance with EN 1337-5.

Pot Bearings are a proven bearing type, their industry standing

has been achieved through the combination of a non-reinforced

elastomeric bearing (Natural Rubber) confined within a closed

steel housing.

With a Pot Bearing, it is possible to transmit high

vertical loads on a very small area, in the case of the bearings

supplied to the River Bann Project, over 1600kN.

The Results

Key Benefits Include:

• Pot Bearings have negligible vertical deflection under load

• Pot Bearings have uniform vertical deflection under load

• Pot Bearings have high vertical and horizontal load capacity

• Pot Bearings cause relatively low stress on the bearing


For more information on GUMBA Bridge Bearings and projects we have worked on across UK and Ireland, please contact our technical team on +44 (28) 3752 8999 or [email protected]

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