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Leiper delighted with 2006 historic bridges competition

ICE news

'AS MY first formal engagement as President, I think it is fortuitous to celebrate the excellence we have seen in these awards, ' declared Quentin Leiper at the Historic Bridge & Infrastructure Awards last week at the ICE.

Leiper said he was 'absolutely delighted' that the key things he wanted to celebrate in his year were represented in the awards: 'Knowledge, legacy and sustainability.' Run by the ICE's Panel for Historic Engineering Works, the awards aim to 'recognise and encourage excellence and innovation in the conservation of English and Welsh bridges and infrastructure more than 30 years old, ' added Leiper.

Professor Roland Paxton chairs the adjudication panel.

The awards are sponsored by the ICE, English Heritage, Network Rail, British Waterways and the CSS Bridges Group, and supported by NCE.

Award: Eigenvalue Extraction Analysis Conventional simple analysis of metallic girder bridges often underestimates the true capacity of a structure because there is a lack of quanti able restraint to lateral torsional buckling.

Eigenvalue Extraction Analysis is described by Pell Frischmann as 'essentially a 'simple' linear buckling technique that is used to assess the lateral torsional buckling capacity'.

Its practical application makes effective use of all material in a bridge and has enabled major strengthening work to be avoided on several railway over bridges that had previously been considered under strength.

Historic bridges can be passed fit for purpose with a minimum intervention to the original structural members and the way in which they carry loading. One example of its use is Doddeshall Bridge, Buckinghamshire.

This road over rail bridge was built in 1909. Capacity was improved from 7.5t to 40t by just adding bearing stiffeners and tie rods to connect the bottom anges of the beams.

Engineer: Pell Frischmann Award: Fossdyke Embankment remedial works, Lincolnshire Timber stakes retaining a coir roll and willow faggott revetment were used as a soft engineering alternative to sheet piles at the foot of a canal levee carrying a railway.

The extensive lengths of repaired bank are expected to have a longer life as well as costing half the price of the conventional piling originally proposed to stem erosion.

Lincoln's Fossdyke is one of the oldest canals in England. It became disused in about 1086, and was reopened in 1121.

Client: Network Rail Value: £650,000 Framework Contractor: May Gurney Rail Services, MG Geotechnical and MG Design Subcontractor: Salix River & Wetland Services Commendation: Derwent Mouth Lock, Derbyshire The brickwork walls and invert of James Brindley's lock, built in 1770 to join the River Trent to the Trent and Mersey Canal, were suffering from the effects of uctuating water levels.

The lock was repaired by using more than 300 horizontal soil nails stabilising the walls, plus a thin reinforced concrete slab laid on the invert and keyed into the toe of each wall. The wall anchor heads were all recessed in the brickwork and hidden by reclaimed bricks set in lime mortar.

Client: British Waterways Central Shires Value: £700,000 Engineer: Arup Contractor: Morrison Construction Services Other rms: APB Group (soil nail sub-contractor) Commendation: Publow Bridge refurbishment, Pensford, Bath Publow Bridge includes an arch dating from the 15th century with Victorian additions. The Grade II listed structure had been exposed to severe scour action and was falling apart. A spreader beam and tie bar design secured the spandrel walls without seriously disturbing ancient ll material or changing its external appearance.

Internal arch strengthening anchors remain invisible while locally sourced stone facing disguises the extensive scour protection works. Separation of the narrow carriageway to form a dedicated footway and traf signing was added with minimum visual intrusion.

Client: Bath & North East Somerset Council Engineer: Mott MacDonald Contractor: Dyer and Butler Other rms: Cintec (main arch strengthening sub-contractor) Commendation: Red Bridge strengthening & renovation, Helpringham, Lincolnshire Red Bridge was built about1825.

It lost its original brick parapets a century later when there was concern about bulging spandrel walls. Further modications included concrete parapets topped by unsightly and under strength railings, plus an external cable duct. By 1998 analysis indicated that it could only carry 10t instead of the 40t needed for local service vehicles.

The strengthening and renovation scheme invisibly reinforced the brick arch barrels; incorporating all services in the road formation; replacing the concrete parapet by dressed stone; and commissioning a geometrically-challenging, bespoke steel railing to a strong but period design.

Client: Lincolnshire County Council Technical Services Partnership Contractor: LCR Highways Other firms : Gifford (Structural analysis, assessment and design); Cintec International (project manager and manufacturer of Archtec strengthening anchors); APB Group (installation of anchors).

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