Contractors World UK & Ireland Vol 6 No 1
At New Station
Built by Carillion Rail for clients
West Yorkshire Combined Authority and Network
Rail, the new, design-award winning, Leeds Station
Southern Entrance (LSSE) will enable greater access
to one of the busiest stations in the UK . It comprises
a concourse deck over the River Aire within a visually
eye catching enclosed building.
The addition of open link span bridges provide
direct stepped access from this concourse to the east
and west banks of the river. This was the challenge for
the contractors. Installing underwater foundation to
support to new steel and glass entrance.
Because of the situation, special attention had to be
made to the concrete mix which was supplied by Hanson
Concrete. The specification of Sika admixtures solutions
in the concrete mix ensured that the underwater con-
crete foundations offered very high resistance to wash-
out and will stand the test of time.
To form the concrete foundations of the structure,
specialist contractor Martello Piling sunk steel tubes into
the river bed in front of the bridge bases with 360m
Hanson concrete containing Sika PilePak placed into
these tubes. This ensured consistency and workability
of the concrete over a prolonged period of time, to avoid
any concrete problems at any one pile position.
Stephen Armfield, Product Development Manager,
“The environmental extremes of having to place
concrete into a river were a particular challenge
on this project. Requiring high quality concrete
and specialist kit including special pumps as well
as commercial divers ensured the critical path
of these foundations was a success.”
Pre-cast sections of concrete were then used to form
the sides and ‘nose’ of the structure protecting the brick
bases. Some 152 m
of Hanson concrete containing Sika
UCS Pak, a specialist underwater admixture, was then
placed in the middle of the structure.
This was free from the flow of water but still placed
underwater. The structure was filled up with fresh con-
crete between the pre-cast segments, which forced any
remaining water out.
The station was opened on schedule in January 2016.
Contractors World UK & Ireland