The units were constructed in a formerly derelict dry dock at the Wallsend and floated the 3km down the Tyne before being sunk into a prepared trench adjacent to the existing tunnel.
We had to prepare the base of the dry dock by levelling and profiling a sand and gravel formation layer prior to laying ply boards.
Each of the 8600t tunnel sections were 90m long by 15m wide and 8.5m high and had three cavities: -
The walls and roof pours took 16 hours to complete and required specially designed cooling systems within the pours to control heat loss/gain and any subsequent cracking.
We have delivered the project on programme and within the client's specified budget.'
Key Quantities include:
The £260 million New Tyne Crossing, completed in November 2011, has taken the top civil engineering gong at the...