The cutting-edge technology, called 'Printfrastructure', will be deployed by HS2 Ltd's London tunnels contractor SCS JV (Skanska Costain STRABAG Joint Venture), in a move that represents a major step forward in construction technology.
Printing concrete with computer operated robots will enable SCS JV to make structures on site, instead of transporting them as pre-cast slabs by road before being assembled and lowered into place by large cranes.
As flexible mobile technology, 3D concrete printing enables the technique to be deployed in physically-restricted areas – avoiding the need to develop complicated and potentially expensive logistical plans.
And where HS2 construction is happening besides a live railway, it offers an opportunity to deliver works without disrupting the travelling public. This is because a robot will print the reinforced concrete, enabling construction to continue and trains to run at the same time. Previously work would have taken place overnight after trains have stopped running, potentially disturbing the local community, or would have required the suspension of services to ensure safe working.
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Using a computer-controlled robot enables the reinforced concrete structures to be printed with a strengthening unique internal lattice structure, which not only significantly reduces the quantity of concrete required but also cuts waste.
But the breakthrough is underlined by technology developed by SCS JV’s Worcestershire-based partner, ChangeMaker 3D. Working with UK advanced materials specialist, Versarien, the high-tech SME’s innovation takes the 3D concrete printing process and combines it with the strongest material ever tested: graphene.
Concrete with microscopic strands of graphene only several atoms thick running through it like stripes in a stick of rock replaces traditional steel to help drive improved site safety, greater construction flexibility, shorter build time and a smaller carbon footprint.
SCS JV estimates that the process it is developing with the Midlands firm could reduce the concrete used and contribute toward reducing carbon by up to 50%. By removing steel and simplifying the construction process, which will no longer require cranes and significantly fewer delivery trucks, the carbon reduction could be even greater.
HS2 innovation manager Rob Cairns said: "The project SCS JV and ChangeMaker 3D are collaborating on is a fantastic demonstration of the kind of far-reaching innovations HS2 enables. With a build programme spanning the decade and across the country, the project is creating an ideal environment to develop technologies with the potential to transform how major infrastructure is built."
