Noord Tunnel
HEIGHT: 8.03 m
WIDTH: 29.95 m
TOTAL IMMERSED LENGTH: 492 m
DEPTH AT BOTTOM OF STRUCTURE: 16 m
FABRICATION METHOD:
The elements were constructed together in a graving
dock, at the same time that the elements for the
Willemspoor Tunnel were under construction. Three
elements were cast in five 26.15 m segments; one
element was cast in four 24.85 m segments. A cooling
system was installed.
WIDTH: 29.95 m
TOTAL IMMERSED LENGTH: 492 m
DEPTH AT BOTTOM OF STRUCTURE: 16 m
FABRICATION METHOD:
The elements were constructed together in a graving
dock, at the same time that the elements for the
Willemspoor Tunnel were under construction. Three
elements were cast in five 26.15 m segments; one
element was cast in four 24.85 m segments. A cooling
system was installed.
Alblasserdam,
Netherlands
Ministry of Transport, Public Works, and Water Management, Rijkswaterstaat
Kombinatie Tunnelbouw (KTB), a consortium of four firms: Ballast Nedam, Van Hattum & Blankevoort, Hollandsche Beton & Waterbouw, and Dirk Verstoep.
Civil Engineering Division of Rijkswaterstaat
3 - 130 m 1 - 100 m
492m
16m
Project construction
1992-04-30
4
Two tubes; three lanes each tube
8.03ù
29.95m
To avoid dredging of the river to allow transport of the elements, the roofs of the
elements were only partially cast. This reduced the draft of the elements enough to tow
them to the site. The roofs were then completed.
elements were only partially cast. This reduced the draft of the elements enough to tow
them to the site. The roofs were then completed.
The elements were constructed together in a graving
dock, at the same time that the elements for the
Willemspoor Tunnel were under construction. Three
elements were cast in five 26.15 m segments; one
element was cast in four 24.85 m segments. A cooling
system was installed.
dock, at the same time that the elements for the
Willemspoor Tunnel were under construction. Three
elements were cast in five 26.15 m segments; one
element was cast in four 24.85 m segments. A cooling
system was installed.
The elements were
deballasted, floated, and
prepared for a two-day tow
over tidal waters and rivers.
After the elements arrived
at the site, the remaining
portions of the roof were
cast, as well as a portion of
the ballast concrete on the
bottom slab. This was used
as added weight for placing
deballasted, floated, and
prepared for a two-day tow
over tidal waters and rivers.
After the elements arrived
at the site, the remaining
portions of the roof were
cast, as well as a portion of
the ballast concrete on the
bottom slab. This was used
as added weight for placing
Four small pontoons with hoisting and mooring winches were hoisted on top of the
tunnel. Conventional placing methods were used. The closure joint was made in the
river between the last two elements.
tunnel. Conventional placing methods were used. The closure joint was made in the
river between the last two elements.
Gina/Omega
No exterior waterproofing was used. Concrete segments were sized and designed to
avoid cracking. Concrete was designed to reduce thermal cracking and produce highdensity
impermeable segments.
avoid cracking. Concrete was designed to reduce thermal cracking and produce highdensity
impermeable segments.
Sand-flow method
1.0 m of sand protection