NEWS |


TBM launched on second subsea bore for HRBT


Typsa/Ramboll team wins Stockholm metro contracts SWEDEN - A Typsa/Ramboll consortium has won two of the three contracts to provide preliminary and detailed design for a new underground metro line in Stockholm. The 8km-long Yellow Line from


Fridhemsplan to Älvsjö is part of the national transport infrastructure development plan, funded by the Swedish government and the municipalities in Stockholm. The metro extension project will use


Typsa and Ramboll’s experience of stations, TBMs, underground structures, and mechanical and electrical engineering, and drainage. The new metro line is to have six stations


and will run through bedrock and under an inlet of Lake Mälaren. “We are proud to continue our


Above: TBM ‘Mary’ has started the second bore of the Hampton Road Bridge Tunnel (HRBT) Expansion project PHOTO CREDIT: VDOT


US - Tunnelling is under way on the second bore of the Hampton Road- Bridge Tunnel Expansion project (HRBT) in Virginia. TBM ‘Mary’ is making the return


journey back towards South Island after breaking through at the North Island reception pit, early last year, to complete the first subsea bore. The project is Virginia’s first bored road tunnel. Following the first drive, the


variable density TBM was rotated on nitrogen skates in the reception pit and underwent extensive maintenance to prepare for the second drive. The first tunnel was excavated in


51 weeks. HRBT Expansion project director


Ryan Banas said: “Many lessons were learned during the first bore, but the most significant is how to operate the TBM slurry treatment plant, and all the logistics around both, such as muck disposal, segment delivery, consumable supply, operation of bicomponent plant, operation of water treatment plant, in harmony to maximise


6 | February 2025


production and minimise downtime and quality issues,” Banas told T&TI. “Furthermore, the team has nearly


one year of experience operating the TBM under their belt. This boots-on-the-ground experience allows them to appreciate the tendencies of the machine and how it will likely behave in specific ground conditions.” The ground conditions are


considered “soft” by geotechnical standards. The geology of the alignment mainly comprises alluvial fine-grained and coarse-grained sands with some areas of plastic and organic soils. Underneath the two islands are artificial fill and zones of ground improvement. Banas said the challenge of


boring subaqueous tunnels in soft soils was added to by the sheer weight and size of the TBM. The project is being developed


by Virginia Department of Transportation (VDOT) and built by Hampton Roads Connector Partners (HRCP), a consortium of Dragados USA, Vinci, Flatiron Constructors, and Dodin Campenon Bernard.


contribution to the sustainable growth and the urban development of Stockholm. We will bring our international experience and team of world-class TBM specialists to support Stockholm to successful completion of the Yellow Line project,” said Fredrik Lilliesköld, country director Typsa in Sweden. The Typsa/Ramboll consortium, in which


the companies are equal partners, has previously provided services and technical expertise for the extension of the Blue, Green, Red and Yellow metro lines. *Stockholm is about to host the World


Tunnel Congress (12-15 May). Prior to the event will be a training course (9-10 May) through ITACET, looking at risk, design development and sustainability.


Gamuda Ferrovial JV planning Oven Mt hydro tunnels AUSTRALIA - Gamuda Ferrovial Construction (GFJV) has signed an Early Contractor Involvement (ECI) agreement with Alinta Energy to help progress design and procurement for Oven Mountain Pumped Hydro. The ECI will last about six months for


the project to be developed on private land adjacent to the Macleay River, between Armidale and Kempsey in New South Wales. The project has yet to receive its final approvals or reach a final investment decision. Oven Mountain PS is to have upper and


lower reservoirs, an underground power plant (900MW), access tunnels, spillways, power waterway, and a transmission line upgrade.


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