Download Piling - Roger Bullivant

case study
Piling
Work type
Working Platform/Piling
Customer
Roger Bullivant Limited
(RBL)
Design Engineer
Rodgers Leask
Key issues/
requirements
T The early establishment of a
stabilised all-weather working platform
on construction sites provides a
safe and sufficiently durable working
surface at all times of year for trucks
and construction plant, such as piling
rigs, to operate safely.
Ground Stabilisation Contractor
T
Piling is specified in many
cases as the engineered foundation
solution because the existing soils
and substrata is considered weak or
prone to settlement. The creation of
an easily accessed, safe piling mat
is therefore essential to the piling
operation.
DNS (Midlands) Ltd
Main Contractor
MWH Treatment Ltd
Project Brief
The installation of a safe working
platform before commencing a complex
pre-cast driven piling contract to support
new structures at Clay Mills Sewage
Treatment Works, Burton on Trent. The
£42m upgrade of the sewage works was
a major project for Severn Trent Water
resulting in one of the largest treatment
works in Europe.
T The contract was for the design,
manufacture, delivery and installation
of 1,381 no. permanent pre-cast
piles to support new structures
at the sewage treatment works.
Large areas of the existing site had
been filled or built-up with spoil
from previous excavations, and
was unsuitable for the proposed
structures.
ROGER BULLIVANT LIMITED
T. 0845 838 1801
www.roger-bullivant.co.uk
T
In many cases, large quantities
of stone have to be imported to
create piling mats and unsuitable
soil removed to landfill, so soil
stabilisation was the ideal solution.
T
Utilising on-site materials, treated
with RoadCem and cement, a
working platform was created. The
resulting mat allowed very accurate
placement of piles. It was strong
enough to hold the piling rig safely,
but flexible enough to allow the precast piles to be driven right through.
This not only ensured the safety of
operatives and plant equipment, but
also eliminated the need for over
2000 lorry movements from site
across a busy rail crossing resulting
in £70k savings on project costs.
T The use of site-won material,
not only leads to significant
reductions in lorry movements,
but also significantly reduces the
environmental damage and overall
carbon footprint of the project.
And because the platform is built
from existing site material and not
imported stone, there is no additional
weight to the construction during the
piling programme.
R
Piling
Solution
RoadCem is a cement modifier
which improves soil stabilisation for
road and construction platforms. It is
a fine grain-sized additive produced
from alkali earth metals with synthetic
zeolites and a complex activator to
alter and improve the way cement
cures and binds soils.
RoadCem enhances and increases
the flexibility and tensile strength
of stabilised soils and significantly
improves the overall performance
of cement bound materials used in
construction.
The addition of RoadCem to cement
stabilisation prevents problems of
shrinkage and cracking and allows
roads, foundations, and construction
platforms to be constructed quickly
even with very soft or organic soils.
Photo: MWH Treatment
The top 3.0m of made ground
was remediated and a RoadCem
stabilised 250mm platform
constructed for the 38 tonne RBL
Quiet Hammer driven piling rig to
operate from.
RBL manufactured, delivered and
installed 1,381 no. permanent
pre-cast concrete piles to support
the new structures at the sewage
treatment works.
This displacement pile solution
eliminates the need for spoil removal.
Often low lying ground is water
bearing and a pre-formed driven
pile satisfies the need for absolute
integrity.
RBL adopted the use of the RB driven
pre-cast piles utilising 250mm x 250mm,
300mm x 300mm and 350mm x 350mm
square section piles driven to a depth
of 8m to carry safe working loads(SWL)
up to 900kN in two sections to eliminate
waste.
The main structures piled were:
• 6 no. final settlement tanks, 36m
dia (FST) and associated distribution
chambers
• ASP (activated sludge plant)
70m x 70m x 6.5m high concrete
structure
• Inter stage pump station 20 x 7 slab
foundation
Carlow Precast provided an innovative
solution for the six large 38m diameter
final settlement tank structures The
modular pre-cast structures were
designed & manufactured off-site ready
for on-site assembly. The quality of precast product ensures the delivery of a far
superior finished structure for the client
and combats the challenges normally
associated with an insitu build, especially
during poor weather conditions.
R
Roger Bullivant Ltd. Head Office, Walton Road, Drakelow, Burton-on-Trent, Staffordshire DE15 9UA
T. 0845 838 1801 F. 01283 517 704 E. [email protected] www.roger-bullivant.co.uk