TUNNELLING HAS fallen behind by three weeks on one of the Channel Tunnel Rail Link contracts in east London.
The first of two tunnel boring machines for the £115M Contract 250 was scheduled for launch towards Stratford from Ripple Lane near Dagenham at the end of August (GE August 2002).
Ian Galloway, Section Two operations manager for CTRL project manager Rail Link Engineering, said the hold-up was partly due to delays in getting access to the TBM launch pit to install spoil removal equipment and partly because of mechanical problems with the first 8.15m diameter Lovat TBM.
'It's a small delay, ' he said.
'If it goes on for a long time it may be a problem - but we're working on it.' Amec has been contracted by Rail Link Engineering to monitor settlement on the main London to Southend railway, known as C2C.
It runs directly above part of the 5.25km twin bore tunnel route.
Main contractor for this section is Nuttall/Wayass & Fretag/Kier joint venture.
The line will remain live throughout tunnelling work so it must be monitored constantly to ensure that tunnelling does not cause any differential settlement that could lead to costly railway closures.