Söderströmstunneln
HEIGHT: 9.2m
WIDTH: 20m
TOTAL IMMERSED LENGTH: 300m
DEPTH AT BOTTOM OF STRUCTURE: 13m to 22m
ENVIRONMENTAL CONDITIONS:
Situated in the Lake Mälaran in the central part of Stockholm and the water is brackish water.
The tunnel is placed half buried in the existing seabed. The tunnel is placed in an area with
extremely soft soil and therefore founded on isolated pile groups.
FABRICATION METHOD:
Outer steel shell fabricated in a ship yard and transported on
barges to Lake Mälaran where the concrete was cast while
floating using the steel shell as a outer formwork.
WIDTH: 20m
TOTAL IMMERSED LENGTH: 300m
DEPTH AT BOTTOM OF STRUCTURE: 13m to 22m
ENVIRONMENTAL CONDITIONS:
Situated in the Lake Mälaran in the central part of Stockholm and the water is brackish water.
The tunnel is placed half buried in the existing seabed. The tunnel is placed in an area with
extremely soft soil and therefore founded on isolated pile groups.
FABRICATION METHOD:
Outer steel shell fabricated in a ship yard and transported on
barges to Lake Mälaran where the concrete was cast while
floating using the steel shell as a outer formwork.
Stockholm,
Sweden
Trafikverket
JVS Söderströmstunneln HB (Züblin and Pihl A/S)
COWI A/S
2 elements@ 107.5.m 1 element@ .85.m
300m
13m to 22m
Project construction
3
Two tubes. One 12m wide railway tube for two tracks and a 5m wide service tube
9.2m
20m
The three tunnel elements are connected to each other without movement joints.
The tunnel is connected to rock tunnels in the southern and to a joint house structure in the
northern end where all longitudinal movements take place.
Two elements are straight and one curved.
There are permanent longitudinal post tension cables in the entire tunnel.
The tunnel is supported on piles groups located with a of c-c distance of approximately 54 m.
The tunnel is connected to rock tunnels in the southern and to a joint house structure in the
northern end where all longitudinal movements take place.
Two elements are straight and one curved.
There are permanent longitudinal post tension cables in the entire tunnel.
The tunnel is supported on piles groups located with a of c-c distance of approximately 54 m.
Outer steel shell fabricated in a ship yard and transported on
barges to Lake Mälaran where the concrete was cast while
floating using the steel shell as a outer formwork.
barges to Lake Mälaran where the concrete was cast while
floating using the steel shell as a outer formwork.
Alignment towers, access
shafts and water tanks
installed while floating on site
of immersion.
shafts and water tanks
installed while floating on site
of immersion.
Situated in the Lake Mälaran in the central part of Stockholm and the water is brackish water.
The tunnel is placed half buried in the existing seabed. The tunnel is placed in an area with
extremely soft soil and therefore founded on isolated pile groups.
The tunnel is placed half buried in the existing seabed. The tunnel is placed in an area with
extremely soft soil and therefore founded on isolated pile groups.
GINA seals used for temporary
purposes, outside the tunnel
profile allowing full concreted
sections inside the seals. The
permanent tunnel is continues
and all movements are taken
in the northern end.
purposes, outside the tunnel
profile allowing full concreted
sections inside the seals. The
permanent tunnel is continues
and all movements are taken
in the northern end.
Black steel shell below the bottom slab and on the walls. A combination of steel and bitumen
membrane on top slab with protection concrete on top. Secondary sealing by water stops in
outer construction joint.
Allowance for 5mm corrosion during the lifetime of the structure has been taken into account.
membrane on top slab with protection concrete on top. Secondary sealing by water stops in
outer construction joint.
Allowance for 5mm corrosion during the lifetime of the structure has been taken into account.
The tunnel is supported on 4 pile groups and 1 direct foundation with sliding bearings that
allows for relatively free movements
allows for relatively free movements
1 m of protection
stones placed on top of tunnel
stones placed on top of tunnel
C35/45. Swedish codes used.
1.03 for temporary situations and 1.06/1.10 in permanent situations