Crossrail C405 Paddington Station
|CONTRACTOR:||Costain Skanska JV|
|SERVICES:||Concrete cutting and controlled demolition|
The Crossrail Paddington station will take the form of an underground box that is 260m long, 25m wide and 23m deep, located directly under Departures Road and Eastbourne Terrace.
Costain Skanska JV appointed Kilnbridge as a specialist subcontractor to reduce the levels of the station diaphragm walls using specialist techniques. Works on the north diaphragm wall involved diamond drilling and bursting techniques whilst the south diaphragm wall involved plunge wire sawing, wire sawing and track sawing. This is the largest plunge wire sawing contract undertaken worldwide to date (370m²).
The south diaphragm wall had to be completed in two phases using only diamond wire cutting techniques. The initial phase involved pre-cutting the 1.2m wide diaphragm wall into sections varying in weight from 1.8 to 8.5 tonnes. The second phase involved the removal of 268 l/m of cut diaphragm wall sections and a reinforced concrete guide wall up to 1.5m thick.
The total approximate weight of concrete removed was 1,650 tonnes cut into 370 sections requiring 70 lorry movements. 1,480 resin anchors were installed and 100% tested to lift out the concrete sections.