BACHY SOLETANCHE Cleaning Up The River Ribble With Deep
Diaphragm Wall Shafts
Specialist geotechnical contractor, Bachy Soletanche, is working
with main contractor KMI Water, a joint venture between Kier
Construction, J Murphy and Sons and Interserve Project Services, on
a project for United Utilities to treat the water that goes into the
River Ribble using a storm water shaft solution involving deep
Diaphragm wall shafts and Cased Secant Piling (CSP).
The project, which started in May of this year, is due to run until
October and is worth an estimated £4.5m for Bachy Soletanche, and
£70m in total for KMI Water. A 27m diameter shaft, adjoining 22m
deep 50x20m screening chamber and a 17m diameter shaft constructed
by Diaphragm Walling will connect with nine additional Cased CFA
shafts on the North side via a 3.5km tunnel constructed 30m below
the ground by KMI Water and will pave the way for a cleaner river.
One of the south diaphragm wall shafts is formed by 14 interlocking
panels 1m thick by 20m deep. Between each panel a CWS waterbar is
being installed to stop water leaking through the joint and ensure
maximum water tightness between adjoining panels. Panels are dug
under a bentonite suspension, then reinforcement cages are placed
and concrete is tremied into the trench. All trenches are going to
be approximately 20m deep.
The screening chamber will only be used in the case of extreme flood
conditions when the shafts can’t manage the load of the storm water
in need of treatment. The 12m deep shafts on the North side of the
River Ribble will take up the dirty water, feed it back under the
River and into the treatment works on the South side.
The Cased CFA, CSP technique forms a closed structure to act as a
barrier in water bearing soils and is ideal for a city centre
project, such as the Preston Shafts, due to its flexible and compact
operation. It brings with it the following advantages:
* Better tolerance than an uncased CFA secant wall
* Better ultimate appearance and reduced overbreak than an uncased
CFA secant wall
* Speedier operation than the more traditional ‘kelly / casing’
rotary bored pile method
* Reduced risk of ‘flighting’ in poor soils than a standard CFA
system
* As it is a cased system; it reduces the risk of distress to
adjacent structures in certain soils such as sands or gravels
Steve Mallinson, Contract Manager for Bachy Soletanche Limited,
said:
“The large southside shafts are more than 20m deep, hence the use of
the diaphragm walls which involve less construction joints than
bored pile walls. On the northside verticality has also been key
throughout this project due to the nature of the interlocking
between the male and female piles to ensure a watertight solution is
created. Water companies are heavily investing in waste water
treatments at the moment so the Preston Shaft project has been a
great one to work on and one we’re sure will make a difference to
the quality of water going into the River Ribble.”
Email:
amy@manifestcomms.co.uk
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Arundel Jones Associates Ltd Registered in England and Wales No.
07334149 Hill Farm, Linton Hill, Maidstone, Kent ME 17 4AL Tel : 01622 745333
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News Categories : Geotechnical contractors
Piling contractors Secant piling
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