Drogden Tunnel

t106-oresund
Oresund, Denmark
HEIGHT: 8.50 m
WIDTH: 42 m
TOTAL IMMERSED LENGTH: 3,510 m
DEPTH AT BOTTOM OF STRUCTURE: 22 m approx.
ENVIRONMENTAL CONDITIONS:
The flow through the Drogden Channel must not be reduced. Consequently
compensatory dredging will be adjusted after the tunnel is in place and backfilled
and the flow is measured.
FABRICATION METHOD:
The 178 m long elements are cast in segments of 22 m in
a temporary production yard in the Copenhagen North
Harbour by use of incremental launch method.
t106
θresundkonsortiet, a company set up to build and operate the link, and owned 50/50 by the Danish and Swedish governments. Owner’s Consultant: θresund Link Consultants, a joint venture of TEC (Holland), Halcrow (UK) and others.
θresund Tunnel Contractors (OTC), a joint venture of NCC (Sweden), Boskalis (Holland), Dumez-GTM (France), John Laing (UK) and Pihl and Son (Denmark). Design and build contract.
Symonds Travers Morgan.
175.2m
3510m
22m
20
Two tubes with two lanes each Two tubes with one track each Central services/escape gallery between road tubes.
8.50m
42m
The 22 meter tunnel segments will be cast in a temperature controlled factory in a single
24 hour long pour to prevent differential cracking. After casting sements will be jacked
forward similar to incrementally launched bridges. After eight segments are completed
and given 10 days of cure under cover, the element will be pushed into a lowering basin
for completion and launched. The temporary lowering basin works similar to a canal
lock system.
The 178 m long elements are cast in segments of 22 m in
a temporary production yard in the Copenhagen North
Harbour by use of incremental launch method.
Outfitting with pontoons
took place in the canal lock.
The flow through the Drogden Channel must not be reduced. Consequently
compensatory dredging will be adjusted after the tunnel is in place and backfilled
and the flow is measured.
Pontoons are used to lower the elements onto the screeded gravel bed.
Gina and Omega gaskets.
No separate membrane is provided as concrete is designed to be watertight. Early age
stresses are controlled by choice of casting sequence and environment, hence
obviating the need to artificially cool the concrete.
Gravel bed placed to level without large scale screeding