tower bridge, london - cast iron welding...

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Tower Bridge, London Structural problems were evident externally but stripping the balustrades and lamp stands down revealed more serious damage Each component was removed with utmost care, broken pieces were collected together ready for reconstruction at the factory. Temporary lamp bases were manufactured and installed whilst the originals were restored. Tower Bridge is one of London’s most famous landmarks and probably the most photographed bridge in the world. Having stood for over a century, some of its cast-iron components are showing signs of decay. Cast Iron Welding Services were asked by London City Council to restore the balustrades and lamp stands that illuminate the bridges northern approach.

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Page 1: Tower Bridge, London - Cast Iron Welding Servicescastironwelding.co.uk/wp-content/uploads/2013/11/Tower-Bridge-Re… · Tower Bridge, London Structural problems were evident externally

Tower Bridge, London

Structural problemswere evident externallybut stripping thebalustrades and lampstands down revealedmore serious damage

Each component was removedwith utmost care, broken pieceswere collected together ready forreconstruction at the factory.

Temporary lamp baseswere manufacturedand installed whilst theoriginals were restored.

Tower Bridge is one of London’s most famouslandmarks and probably the most photographedbridge in the world. Having stood for over acentury, some of its cast-iron components areshowing signs of decay. Cast Iron WeldingServices were asked by London City Council to restore the balustrades and lamp stands that illuminate the bridges northern approach.

Page 2: Tower Bridge, London - Cast Iron Welding Servicescastironwelding.co.uk/wp-content/uploads/2013/11/Tower-Bridge-Re… · Tower Bridge, London Structural problems were evident externally

Back at the factory, the componentswere reassembled and carefullymeasured before being stripped ofover twenty layers of paint!

Stripping back a century of paintrevealed the crisp detail of theoriginal mouldings, some of whichhad to be re-attached due tocracking and corrosion.

Broken lugs werefound, re-welded anddrilled to accept theoriginal tie-rods.

Page 3: Tower Bridge, London - Cast Iron Welding Servicescastironwelding.co.uk/wp-content/uploads/2013/11/Tower-Bridge-Re… · Tower Bridge, London Structural problems were evident externally

The repaired componentsare bolted together and ifnecessary machined true.Finally each component isprimed, rebuilt andmeasured for fit.

Gas fusion welding requires the composition ofthe iron in the damaged component to beanalysed, enabling bespoke filler rods to be castto achieve the repair. A custom-built furnace isconstructed around the component within whichthe welding takes place. Heat is appliedgradually to allow the furnace to reach atemperature of 5800c at which point the metalaround the repair is melted and the filler rods fillthe damaged area. The component is cooledgradually and the repair evaluated.

The damaged areas are ground outready for gas fusion welding. The

repair is then cleaned up ready forfinal machining and painting.

Page 4: Tower Bridge, London - Cast Iron Welding Servicescastironwelding.co.uk/wp-content/uploads/2013/11/Tower-Bridge-Re… · Tower Bridge, London Structural problems were evident externally

Samson Road, Hermitage Industrial Estate, Coalville, Leicestershire, England LE67 3FP

Tel: +44 (0)1530 811308 Fax: +44 (0)1530 835724Email: [email protected]: www.castironwelding.co.uk

The restored lampstand was carefullylifted back into place.

The balustrades are slotted into positionfollowed by the capping rail.

The restored balustrade and lamp stand ready for final painting.

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