Grouw Tunnel
HEIGHT: 7.05 m
WIDTH: 31.75 m
TOTAL IMMERSED LENGTH: 68 m
DEPTH AT BOTTOM OF STRUCTURE: 11.5 m
FABRICATION METHOD: The element was constructed in the approach. It was cast in four sections without flexible joints. Reinforcement was continuous and the tunnel was permanently prestressed.
WIDTH: 31.75 m
TOTAL IMMERSED LENGTH: 68 m
DEPTH AT BOTTOM OF STRUCTURE: 11.5 m
FABRICATION METHOD: The element was constructed in the approach. It was cast in four sections without flexible joints. Reinforcement was continuous and the tunnel was permanently prestressed.
Grouw,
Netherlands
Ministry of Transport, Public Works and Water Management; Rijkswaterstaat
Ballast Nedam Beton en Waterbouw b.v.
Civil Engineering Division (former Locks and Weirs Division) of Rijkswaterstaat
68m
68m
11.5m
Project construction
1992-04-30
1
Two tubes with two lanes each for the highway and one tube for bidirectional local road.
7.05m
31.75m
Supported on the abutments
The element was constructed in the approach. It was cast
in four sections without flexible joints. Reinforcement was
continuous and the tunnel was permanently prestressed.
in four sections without flexible joints. Reinforcement was
continuous and the tunnel was permanently prestressed.
After the approach structure
was flooded, the element
was pulled through it across
the channel. Water ballast
tanks were in river retaining
structures on top of the
element.
was flooded, the element
was pulled through it across
the channel. Water ballast
tanks were in river retaining
structures on top of the
element.
The river retaining structures were designed to eliminate the need for additional
equipment. Water ballasting was sufficient.
equipment. Water ballasting was sufficient.
An inflatable rubber gasket
and an Omega gasket.
and an Omega gasket.
There was no separate exterior waterproofing membrane.
The element was supported on both abutments like a bridge. No sand was provided
under the tunnel.
under the tunnel.
10 cm of concrete.
B35