The TBM, whose remaining parts
are being delivered and assembled in
the next few weeks are due to start
working in the summer.
The Shieldhall Tunnel is expected to
be completed by about the end of 2017.
Towards the end of 2015, geotechnical
specialist Bachy Soletanche completed
the mammoth task of installing the pro-
ject’s 675 piles in just three-and-a-half
months. The piles play a vital part in the preparation of
the ground for the next stage of the project: the start of
the tunnel drive.
The work carried out by Bachy Soletanche included
the construction of cased secant piles (CSP) for the first
shaft of the tunnel, the service chamber and tunnel
boring machine launch chamber.
There is also 400 m of continuous flight auger (CFA)
contiguous piled walls for the cut-and-cover section of
the tunnel. The reinforcement cages placed in the piles
each weighing approximately one tonne each, were
more than 15 m long and were filled with nine cubic
metres of concrete.
As well as being technically challenging, the work
had to be carried out within a residential area and in a
The two 25 m tall piling rigs – the 100 tonne CSP and
70 tonne CFA - two huge service crawler cranes and
concrete pumps had to work in an area equivalent to
the size of just three full sized football pitches.
Brian Walker, Costain Senior Project Manager for the
Shieldhall Tunnel, was impressed with the piling
“The location and size of our site is very
challenging but with some careful planning and
collaboration with Bachy Soletanche, a major
part of this development is now complete and,
very importantly, without any issues or incidents.
“It was great to see that final pile being
completed and now we are set to begin the next
part of the project, when we connect the 150 m
long tunnel boring machine and begin
George Leslie has completed two schemes along the
route and introduced an innovative solution to minimise
(see full report -http://cwmags.co.uk/ cwuk-4-5/basic/page26.php
The company used a combination of Kijlstra’s Vario and
panel system products. The Vario CSOs were delivered
as pre-assembled units measuring up to 5 m x 3 m and
comprising a base unit, four walls, a weir wall and rise
•VINCI Construction Grands Projets
Groundforce Shorco heavy duty props used in
preparation trench works .
Contractors World International Vol 7 No 3
Contractors World International