How Tesco intends to do it:
Tesco will keep the existing tunnel framework and use a crane to add new units where the collapsed occurred.
These units will then be used as a cast for a new reinforced concrete arch, with concrete being poured over them.
While the original panels slotted together, the new arch will be seamless with a layer of extra support to bear the weight of the store and store foundations.
Concrete will be poured from east to west towards Packhorse Road Bridge, accompanied with fill material and water–proofing.
Once the tunnel is complete, a store should take 26 weeks. The store will be the original design but the foundations will be modified.
Tesco say they will also carry out several "road improvements" by December 2009.
When Tesco intends to do it:
From now until September – agree detailed design and construction programme and gain approval from Network Rail.
February 2008 onwards – start work on tunnel, remove excess fill material from site, bring in new tunnel segments, pour concrete over arches, import more infill.
April 2009 – works to "impove" road at the front of the store.
August – November 2009 – reinstate station
September 2009 – start to construct store, second stage of road improvements.
December 2009 – complete road improvements.
March 2010 – new store opens.
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