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Lord of the ring roads

CONTRACTS

A MAJOR road bridge across the Rochdale Canal has been rebuilt to minimise maintenance costs and improve traffic flow.

Peter Clapham, principal engineer (bridges) at Rochdale council's technical services department said: 'Kingsway is a principal route that forms part of the outer ring road round Rochdale and has a requirement to carry heavy vehicles and wide loads.

'Rather than undertake a considerable amount of structural repair, a decision was taken to replace the bridge.' Built in 1932, the design of the original structure was dictated by ground conditions consisting of a 3m layer of peat. The original concrete bridge has now been replaced by a shorter span - 15m as opposed to 150m - and two piled reinforced soil approach embankments.

Sections of the approach embankments were formed with vertical faces using the Tensar Wall System of geogrids and facing blocks. This solution has the dual merits of reducing land take and long-term maintenance.

Tensar International provided a complete design and supply package working with the client and the main contractor, Galliford Northern.

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