Giant Tunnel Boring Machine For Glasgow
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.
Preliminary Works Milestone
Towards the end of 2015, geotechnical specialist Bachy Soletanche completed the mammoth task of installing the project’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 restricted workspace.
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 operation:
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 tunnelling.
Groundforce Shorco heavy duty props used in preparation trench works .
George Leslie has completed two schemes along the route and introduced an innovative solution to minimise inconvenience. (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 units.