Vibro Projects Limited - Back to School
 Vibro
Projects Limited went back to school recently, working on the
high profile £30M West Dunbartonshire School PPP Project in
Clydebank. The project, which is managed by HBG Construction,
involves the redevelopment of the town’s two main higher education
schools – Clydebank High School and St Peter the Apostle High School
– to provide modern, state-of-the-art facilities for the community.
It is pretty much a similar story up and down the UK; many school
facilities have become out-dated and often too small for the high
pupil intakes that many schools have to fulfil, which means they
drastically need redeveloping or redesigning. Luckily the
introduction of the government initiative, Public Private
Partnerships has given local councils and private businesses the
opportunity to work together to finance, construct and redevelop
public sector buildings, such as schools, to bring them into the
21st Century. The school redevelopment project in Clydebank is
specifically for this purpose and HBG Construction, Bam PPP and West
Dunbartonshire Council are working in partnership to fund, design
and construct these new and improved facilities.
It was discovered in the early stages of the design process that the
bearing capacity of both sites would need increasing. As a result,
Vibro Projects was awarded the ground works contract by HBG
Construction to deliver a practical ground improvement solution that
would not distract or disturb the schools’ pupils, but at the same
time would get the job done quickly and cost effectively. Vibro
Projects Contract Manager, Gerry Crawford explained:“As the two
original schools will be in use until the new schools are built, we
studied hard to design and deliver a solution that would fulfil all
the requirements. We found that the ‘top feed’ vibro stone columns
technique was the best solution as it is quick, produces no land
fill spoil – which reduces lorry movements – and utilises the
existing soils to produce a solid foundation for the future
generations of Clydebank.”
The stone columns ‘top feed’ method has the duel effect of
densifying suitable soils while also reinforcing the soil-column
matrix using a top feed method. First of all, the soil is penetrated
to the required depth by the combined effect of the Vibroflot
weight, vibration and a jetting action by air. The Vibroflot is then
lifted out so that course gravel, crushed stone or crushed aggregate
can be tipped in the hole in increments of about 500mm. The
Vibroflot is then reinserted and compaction begins. Redial forces
produced by the vibrator drive the added material horizontally out
against the in- situ soil. The Vibroflot is again removed and the
filling/compacting cycle is repeated step by step up to the surface.
With this complete, a dense column of granular material interlocking
with the surrounding ground is formed through the treatment zone to
increase bearing capacity.
Vibro Projects installed over 4000no. ‘Top Feed’ vibro stone columns
across both sites. At St Peter the Apostle, 2,500 no. 6m columns
were installed with a pre-bore into made ground and sand fill. Then
the
Vibro team went a mile down the road to complete 1,700 no. 4.5m
columns again with a pre-bore into a ground strata of lime modified
clay, burnt shale fill and sand clay at Clydebank High School. A
pre-
bore (auger drill) was required to initially penetrate the soil due
to the ground strata. Without the pre-bore, the Vibroflot would be
unable to break into the ground.
From start to finish the project was completed in nine weeks and
Gerry Crawford continued: “The ‘top feed’ stone column method proved
to be the best technique for the job as the project ran smoothly, on
schedule and caused the least disturbance for both pupils and staff
at the two schools.
We now look forward to seeing the project progress to when the
Clydebank High School and St Peter the Apostle open in the new
school year of 2009, as we know how much the current pupils and
future
generations to come will reap in the benefits of these new and
improved facilities.”
Email:
fiona@manifestcomms.co.uk
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