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Shuffling the deck

Roads

The most eagerly anticipated event during construction of the bypass is scheduled for October, when the existing deck of Lavenders Road bridge will be slid 10m on to new abutments.

A generous original design means that the span of the bridge will be just enough to get two extra lanes beneath it. But to use it in its existing location would mean either putting a nasty kink in the road alignment or carrying out 1km of uneconomic earthworks.

Instead, PBA came up with a better idea - shift the bridge's post-tensioned reinforced concrete deck 9m to the east.

In advance of the slide, Birse will excavate behind the east bank seat and remove the wingwalls. A new abutment will be cast and temporary props and slide beams installed between existing and new abutments. On the west side slope, material will be removed to again allow for a new abutment and temporary props and beams. Hydraulic pulling rams will then drag the deck across.

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