W2D-010 Port Tunnel variation-1.txt
DEFINITIONS OF SOME TECHNICAL TERMS ON THE FOLLOWING PAGES: SURFACE ROAD:
Where a road is constructed at or near ground level.
OPEN CUT:
Refers to the situation where the road is in a trench or cutting, at a lower level than the surrounding ground.
CUT AND COVER TUNNEL:
Cut and cover tunnels are constructed by excavating a trench from the surface downwards, constructing the floor, walls, and roof of the tunnel in the trench, and then filling the trench in again, and restoring the ground surface.
BORED TUNNEL:
Bored tunnels are constructed from beneath the ground surface, by excavating and removing the material to the shape of tunnel required, and supporting the surrounding ground. Different types and methods of tunnel excavation can be used.
GRADE SEPARATED JUNCTION:
This type of junction occurs when two roads at two different levels are connected.
ROUTE A1 Route Description:
Route A1 would be in open cut at Whitehall and involve a new junction layout at Collins Avenue before continuing in open cut through the grounds of St. Mary's convent, High Park and Highfield. Bored tunnelling would be used under Griffith Avenue continuing with 'cut and cover' tunnelling behind Rosmini and St. Joseph's schools. Open cut would be used again through the grounds of St. Vincent's Hospital to Richmond Avenue, with further sections of bored tunnel and 'cut and cover' tunnel under Richmond Avenue, Annesley Bridge Road, through Fairview Park and under the railway line. The route would then cross the Tolka Estuary on a bridge and continue as a surface road into the North Port.
