We are pleased to present this book which showcases ... - WSP Group

Stockholm is built on many islands.Water surrounding the city on
all sides gives it great natural beauty, but causes difficulties for city
centre communications. In rail traffic terms, Stockholm is ‘waspwaisted’,
with only two tracks approaching from the south, a situation
which has existed since the railway first reached the city back in
1871. Since then, traffic levels have soared and the two tracks now
carry 500 trains a day, causing delays at peak times.
The City Line is a project to bore a new 6 km rail tunnel under
central Stockholm between Tomteboda, northwest of the city, and
Stockholm South station. It will enable more traffic to be routed
through the narrow approach to the city centre, easing congestion
and increasing capacity by providing local commuter trains with their
own dedicated section of track through the city. City Line will also
have two central underground stations to relieve city centre rail
traffic, doubling capacity through the city from the current 24 trains
per hour in each direction to 48.
The Swedish Rail Administration has appointed WSP to project manage
the track, water and waste water installations for the entire length of
the tunnel, as well as undertaking rock investigation, geotechnical and
construction work for the northern half of the project.
Building a new rail tunnel in a city centre between 10 and 40 m
below the surface is a very complex and high-risk undertaking.
In fact, the project’s geotechnical models are the most complex ever
run in Sweden.The new tunnel intersects the existing subway in two
locations, so blasting necessitates the relocation of the subway track.
WSP’s activities include the preparation of a new prefabricated bridge
concept to carry traffic during the construction period.
The new tunnel has several interchanges with services tunnels
carrying traffic control, power supply, water, waste water, telecom
and energy lines.Access tunnels will also be required for the removal
of building materials and blast rubble.
Client:
The Swedish Rail Administration
Project value:
£7400M
Project size:
6 km rail tunnel
Status:
City Line opens in 2011
WSP services:
Permanent way design
Geotechnical engineering
Water and waste water design
Geotechnical surveys
Construction planning
Risk assessment
Environmental consultancy
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