North – South Line CS Tunnel
- Client City of Amsterdam
- Location Amsterdam
- Status Delivered
Description of the activities Design, engineering, preparation and execution of the transport and immersion process of the tunnel element underneath the monumental buildings and railway platforms of the Central Station in Amsterdam, which is part of the project North - South Line.
The world's first immersion operation under a historic building. A piece of world history.
For the part of the North - South Line underneath Amsterdam Central Station and under the adjacent river IJ the immersed tunnel technique has been used. Both tunnels were built inside a casting basin in the northern approach ramp of the IJ-tunnel. The tunnel elements were floated while flooding the casting basin and transported through the river IJ and the North Sea Channel, to a temporary mooring location in the Suezhaven at a distance of seven nautical miles. During transport the shipping lane could not be blocked, shipping was regulated.
Because of the limited space underneath the monumental buildings and railway platforms of Amsterdam Central Station and the relatively high water level in the river IJ, the CS-element was brought in position in several stages. A temporary cofferdam and two partitioning walls were used to create a sluice to be able to lower the water level in two steps to a total of 2.6m enabling to move the tunnel elements underneath the platforms and station building.
Today we create tomorrow
Length of immersed section: 136 meters
Total amount of elements: 1
- TE01 (LxBxH) = 136 x 21,08 x 8,05m
Depth: 16,8 meters
Achieved placing tolerances:
- vertical: +/- 10 mm
- horizontal: +/- 25 mm