Page 17 - Contractors World -UK & Ireland Vol 2 No 4 (May 2012)

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m long boom, a 180 tonne
counter weight and took two
days to assemble on site.
I n t o t a l , t he r e a r e 24
sec t i ons wi th a max imum
length of 30 m. These are
welded to give a maximum
span 68 m over the river. As
each sect ion i s l i f ted into
pos i t i on , Hau l ot te acces s
platforms are used to release
the crane lift cables and other
works.
Phil Dilworth, Birse Civils
Site Manager, said, “Installing
the final sections of bridge
beams is always a key moment
in the del ivery of a project
like this as it emphasises the
progress being made. It is even more significant in this case as it has re-
established the connection between the north and south banks of the River
Derwent on the alignment of the original Northside Bridge.
“We have had a lot of interest from the local community and it was great
to see so many people coming to watch the beams being lifted into place.
With that operation successfully completed, we can now press ahead with
finishing the bridge and constructing the road in readiness for opening the
bridge, currently scheduled to happen this September.”
Cllr Tony Markley, Cumbria County Council’s cabinet member for
highways and economic development, said,
“This is a hugely symbolic moment for local people as they are able to see
the new bridge connecting the two sides of the river for the first time.”
The project has been funded through Department for Transport
Emergency Capital Funding earmarked as part of a wider package of support
agreed at the time of the floods in November 2009.
Cumbria County Council’s contractor carrying out the work, Birse Civils,
moved onto the site on August 15 2011 to set up new site offices and began
work on test bore holes. The ground conditions were more problematic than
expected and a revised method of pile construction was required - a more
time-consuming technique, Polymer support fluid was used to prevent the
bores collapsing prior to placing the 11 m³ C30/37 concrete mix per pile,
Using a Soilmec R-20 hydraulic rotary rig,72 piles of 600 mm diameter where installed to depths of maximum 26 m.
In January, fabrication of the beams began and the deck construction comprises 5 concrete pours between late April
and mid June. Deck base course is due to be laid in the first week of July, the running course in early August ahead of
white lining and other works required to allow the bridge to be open to traffic.
Trial cutting of the recovered stone from the former bridge has been carried out and the method to maximise the use
of the recovered stone use in the cladding of the bridge abutments and piers is now in place.”
The construction programme is scheduled to be completed in August 2012, with the new bridge expected to be open
to traffic in mid-June 2012.
The three-span structure is supported on concrete piers and will be clad in sandstone, similar to that used on the
original bridge. Where possible reclaimed stone from the original structure will be used.
Associated works include service diversions, retaining walls and roadworks to connect the new bridge to Workington’s
existing road network. Once the new permanent bridge is open to the public, the temporary road bridge that was built in
72 days and opened in April 2010 will be closed and removed by the contractors Morgan Sindall.
Page 17
Contractors World - UK & Ireland Vol 2 No 4