Schiphol Railway Tunnel
HEIGHT: 8.05 m
WIDTH: 13.60 m
TOTAL IMMERSED LENGTH: 500 m
DEPTH AT BOTTOM OF STRUCTURE: 9 m
FABRICATION METHOD:
The casting basin made use of the adjacent cut-andcover
area. Each element consisted of six segments with
flexible joints.
WIDTH: 13.60 m
TOTAL IMMERSED LENGTH: 500 m
DEPTH AT BOTTOM OF STRUCTURE: 9 m
FABRICATION METHOD:
The casting basin made use of the adjacent cut-andcover
area. Each element consisted of six segments with
flexible joints.
Amsterdam,
Netherlands
Dutch Railway
KSS, Consortium of Hollandsche Beton en Waterbouw and Structon
Holland Rail Consult
125m
500m
9m
Project construction
1995-04-30
4
One tube; two tracks
8.05m
13.60m
The railway tracks under the airport were doubled (from two to four). The new tunnel
was constructed directly adjacent to the existing tunnel. Most of the 5.7 km of the
railroad tunnels were constructed by cut-and-cover; however, a section 500 m long
passing under a runway was constructed as an immersed tunnel. This was done so
that the closure of the runway could be reduced to the minimum time possible.
was constructed directly adjacent to the existing tunnel. Most of the 5.7 km of the
railroad tunnels were constructed by cut-and-cover; however, a section 500 m long
passing under a runway was constructed as an immersed tunnel. This was done so
that the closure of the runway could be reduced to the minimum time possible.
The casting basin made use of the adjacent cut-andcover
area. Each element consisted of six segments with
flexible joints.
area. Each element consisted of six segments with
flexible joints.
The casting basin consisted
of a cross-braced sheetpile
cofferdam. The elements
were fully outfitted in the
basin.
of a cross-braced sheetpile
cofferdam. The elements
were fully outfitted in the
basin.
After the dock was filled with groundwater, the elements were floated to a freeboard of
15 cm and pulled by winches under the bracing to their position. The elements were
lowered from hoists on beams which spanned across the top of the cofferdam as they
were ballasted with water.
15 cm and pulled by winches under the bracing to their position. The elements were
lowered from hoists on beams which spanned across the top of the cofferdam as they
were ballasted with water.
GIna and Omega gaskets
were used.
were used.
No exterior waterproofing membrane was used.
Sand-flow method
1 m of compacted layers under the runway pavement
B35