DRILL & BLAST | CONVENTIONAL
The long twin tubes of Rogfast are being excavated by
drill and blast method. The ship tunnel will be shorter but still long - and
be very high and wide, big enough for a ship to slowly move through, bypassing rough waters near a headland by going through the mountain instead of around. NCA director-general Einar Vik Arset said: “The NCA
is considered a one-time constructor when it comes to such a large project as the Stad Ship Tunnel, so it is not ideal to build a large internal project organisation; that is why we have initiated a collaboration.” Several new resources are being brought in, including
project and construction management, geology, tunnel operations, health and safety, and workplace regulations, to prepare the project organisation for the start of construction.
UK Above:
Norwegian agency teamwork to advance ship tunnel plans PHOTO CREDITE: NCA
NORWAY
Stad Ship Tunnel Norway is planning an uncommon very large tunnel - for ships, on a vital part of the country’s rugged fjord coastline. The Stad Ship Tunnel project is being developed by
the Norwegian Coastal Administration (NCA). The project development for the ship tunnel has been underway for the last few years. Recently, the authority boosted its project organisation
by establishing a collaboration with Statens Vegvesen (the Norwegian Public Roads Administration, NPRA) to help take forward project development. While tunnels are uncommon for the coastal
authority they are almost the bread and butter of the roads authority, which builds many inland and at various parts of the long coastline - including subsea road tunnels. In fact, the world’s longest subsea road tunnel project - Rogfast - is currently being constructed by NPRA.
Coire Glas hydro project Exploratory tunnelling was recently completed for development of SSE Renewables’ 1.3GW Coire Glas pumped storage hydropower project, located at Loch Lochy in the Great Glen, in Scotland. Strabag UK completed the 1.2km-long exploratory
tunnel in the Scottish Highlands after beginning exploratory works in December 2022. SSE’s technical partners, Stantec and Cowi, designed and supervised the ground investigation programme. The works included building a tunnel approximately 5m high x 4.5m wide through the hillside around the proposed location of the underground powerhouse caverns complex. The tunnel will allow the project team to gather accurate information on the geological conditions to inform the detailed design for the main works. Exploratory drilling and testing will continue to
further investigate the ground in the area of the proposed powerhouse caverns. The Coire Glas pumped storage project would
create 30GWh of long duration energy storage. With a greenlight on a final investment decision, main construction could start in H2-2026.
MUMBAI MAIN TUBES START SOON
Tunnelling has progressed on inclined adit construction for the Mumbai-Ahmedabad Bullet Train Project, paving the way for main construction work on the 21km-long tunnel between Bandra Kurla Complex (BKC) and Shilphata in Maharashtra. Adit excavation began at the end of 2023. Main construction will involve both NATM and TBMs
18 | February 2025
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