HS2 is a new high-speed rail line that will be the backbone of the UK’s rail network. Phase One of this project will connect London to Birmingham by between 2029-2033. In April 2020 Balfour Beatty Vinci JV was awarded Contracts N1 and N2 of High Speed II project (Contract N1 and N2). Contracts N1 and N2 spans around 90km of HS2 Phase I and it consists of tunnels, bridges, viaducts, culverts and earthworks. There are two twin-bored tunnels and GZ is responsible for the independent (CAT III) checking Bromford Tunnels, associated Cross Passages and the several adits around the ventilation and intervention shaft.
Category III Design Check Services:
Gall Zeidler Consultants (GZ) have been appointed to carry out independent checking (CAT III Check) of all structural elements of 5.8km long twin-bored Bromford Tunnels, thirteen (13 no.) cross passages, eight (8 no.) adits, TBM break through D-walls and head wall inside the portal structure. GZ’s scope also includes the independent checking of the ground movement assessment, first stage concrete and walkways within the running tunnels.