Contractors World UK & Ireland Vol 3 No 6 - page 12

Naburn wastewater
works gets support
G
roundforce has supplied a range of
specialist equipment, including MP80,
Mega Brace, Maxi Brace and double-
acting Mechshore braces to install a new large-
diameter pipeline at a Yorkshire wastewater
treatment works.
The contract, at the Naburn WWTW,
involves the laying of a new 1.6 m diameter
steel pipe to carry sewage sludge across
the site to the final settlement tanks where
it is prepared for de-watering and disposal.
Improvements are being led by Black &
Veatch
as principal contractor.
The route of the 100 m long pipeline
crosses several existing services which the
new pipe must run beneath. This has meant
digging down as deep as 7 m to get enough
clearance.
“The pipeline passes through the loca-
tion of old sludge lagoons and the ground
condition here is very poor,” says Richard
Kent, section engineer with Black & Veatch.
“Approximately half of the trench had to
be supported with steel sheet piles which
needed to be heavily braced,” he added.
The shallower stretches of the 3.2 m wide
trenchs were lined with standard trench
sheets and supported with double-acting
Mechshore braces but where the pipe dived
down to clear an existing FST feed pipe
crossing the new excavation, heavier equip-
ment was required.
“The deeper section was lined with inter-
locking sheet piles and three levels of frame
Groundforce Expertise in
Support Solutions
From major infrastructures, such
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Contractors World - UK & Ireland Vol 3 No 6
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