Hamang Transformer Station

About the Project

The project involved extensive groundwork associated with the construction of a new, compact, gas‑insulated transformer station. The site lies primarily on bedrock, which was excavated by hydraulic breaking. An extensive pile foundation , more than 100 piles, was installed to ensure proper load transfer and long‑term stability.

The transformer section of the station stands on existing concrete piles located very close to the Bjørnegård Tunnel, requiring precise coordination of both earthworks and structural construction.

In addition, MD’s groundwork formed part of the establishment of a concrete beam‑grid structure, which acts as a load‑bearing system between the station and the tunnel infrastructure below. The work was carried out within a very confined area, requiring continuous coordination with the Norwegian Public Roads Administration (Statens vegvesen), which completed its E16 works immediately prior to the project start.

The building structure is constructed in concrete and partially clad with Cembrit panels, with insulation standards adapted to the different functional zones of the facility. The new station is divided between Statnett (420 kV) and Elvia (132 kV and 47 kV), mirroring the configuration of the electrical installations.

Work performed by MD

• Establishment of the excavation pit and terrain adjustments
• Rock breaking and handling of materials with varying quality
• Handling, temporary storage and reinstatement of masses
• Excavation and groundwork in areas with dense underground infrastructure Installation of extensive infrastructure for roads, underground cable routes and water/wastewater systems
• Foundation‑preparation works, including pile locations
• Contribution to the construction of the concrete beam‑grid forming the station’s foundation structure
• Preparation of site facilities and access routes in a highly confined work area
• Coordination with other stakeholders to ensure safe progress in challenging surroundings