Tunnel Management |
hourglass,” continues Erik Lindgren,
project manager for tunnels. “People
from the south who work in the
north have difficulties transporting
themselves. The system is sensitive to
accidents on the north-south
Essingeleden, with significant risk of
traffic jams and no good,
alternative route.”
Twin-tube approach
Snaking through residential
areas and passing close
to Drottningholm Palace
World Heritage Site on Lovö
Island, 18km (11 miles) of the
21km (13 mile) route must be
carved out in tunnels, using
the established Swedish twintube
19
million
The metric tons of rock
that will be excavated to
create the Stockholm
design.
“A very wide, six-lane tunnel
would not be optimal and having
two tunnels satisfies evacuation
requirements,” Lindgren continues.
“Every 100m we have an escape route
to the other tunnel. 18km (11 miles) of
tunnels in each direction with ramp
access and escape tunnels makes
over 55km (34 miles) altogether.”
Some 19 million metric tons of
rock will be excavated in a
prodigious drill-and-blast offensive
to fashion horseshoeshaped
tunnels with
varying interchange
cross-sections.
Trafikverket has
procured five contracts for
the installation works in the
Stockholm Bypass, at a
combined value of
approximately SEK4.3 billion (US$465
million). Siemens secured contract
FSE901 for communications, plant
control and monitoring systems;
Bravida Sverige AB secured contract
FSE902 for electrical power, lighting
and HVAC; Assemblin ventilation
secured contract FSE903 for tunnel
ventilation; SICE secured contract
FSE904 for traffic systems, and
Bravida Sverige AB
secured contract FSE905 for
drainage and fixed
firefighting systems.
Integrated communications
Siemens Mobility US$85 million
Trafikverket contract includes
technology covering some of the
tunnel safety functions. This
encompasses an integrated
communications platform, CCTV
surveillance, cellular and radio
networks and detection systems.
Siemens will build on a track record of
systems provision for European
tunnel projects including Germany’s
Richard Strauss Tunnel, Turkey’s
Espiye-Sarp Tunnel and the San
Fedele and Lungern Tunnels in
Switzerland. Siemens is expected to
employ its Sitraffic International
Tunnel Control Center (ITCC)
platform, using standardized software
modules to create a flexible hub for
real-time traffic and tunnel systems
data. “Part of ITCC is a library of
algorithms and standard software
building-blocks,” says Miki Hegedus,
head of ITS sales at Siemens Mobility.
“We have these ‘Lego-blocks’, but the
Stockholm situation is very specific
and there are many things we must
customize or build ourselves.”
As ITS installation is scheduled
for 2021 at the earliest, the exact
software and hardware involved is
not yet finalized and may evolve in
the interim. Nevertheless, tunnel
management typically involves
several key elements, beginning with
cameras – and lots of them.
Regulations dictate that CCTV must
cover every inch of tunnel, requiring
perhaps 1,000 cameras in total. “You
tunnels
Above: Much
of the tunneling is
taking place in the
ground beneath lakes
and inlets, where
currently road bridges
serve traffic above
the surface
Stockholm is build on a number
of islands and shaped like an
hourglass. People from the south who
work in the north have difficulties
transporting themselves.
Erik Lindgren, project manager for tunnels, Trafikverket
Traffic Technology International July/August 2019
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