Bjørvika is Europe´s biggest waterfront project and Norway´s largest ever – and it is going to be Oslo’s new business district. The old harbour on the eastern side of Oslo Fjord is being transformed into a thriving residential, cultural and commercial centre. As part of Bjørvika, property developer Oslo S Utvikling AS is developing Operakvarteret (Opera Quarter, formerly named Barcode project). It includes a row of high-rise buildings with 10,000 offices and some 500 apartments, among others for Norway‘s largest bank DnB NOR, whose headquarters will move into three bank buildings (blocks A, B, C).
Makno Teknikk, BundeBygg and MEVA
Maxbo Teknikk AS in Vøyenenga, one of MEVA´s longest standing partners and building supplier of 50 years, is supplying the entire Opera Quarter project. Together with leading Norwegian concrete contractor BundeBygg AS, they chose MEVA for all concrete works, including cores, elevator and staircase shafts, inside and outside walls, columns and slabs.
Wall formwork on climbing scaffolds
The walls and elevator shafts were poured with the multi-purpose StarTec wall formwork on KLK climbing scaffold. The first 5 floors have different heights (2.7, 2.9, 4.56, 4.1 and 4.0 m.) From the fifth floor upward, the standard height is 3.65 m. All walls were poured with 270 cm panels plus a 135 cm extension. Using the same panel combination for different wall heights considerably reduced the panel inventory on site.
Stripping corners and shaft platforms
Shaft platforms were used inside the staircases and elevator shafts. The wall formwork was placed on the platforms, together with stripping corners for easy stripping. The shaft platforms for the elevator shafts rested on platform girders with safety pawls resting safely in cast-in bearing pockets. The entire construction took only one crane lift to the next floor.
Leave the door open
Another time saving method was leaving openings in the wall formwork where the elevator shafts were going to have doors. This allowed workers to simply walk inside the shafts rather than climb over the formwork and rebars.
Climb the stairs
The staircases required a different idea because stairs from the lower floor were mounted immediately after pouring the shaft walls. Here, the platform rested on girders attached to climbing cones. After the pour, the formwork was crane-lifted out of the shaft, followed by the platform. Now the staircase was flown in and mounted. Then the platform and formwork were returned to the shaft for the next pour. Mounting the stairs on each floor directly after the pour had a double benefit: the stairs were in place soon after the shaft was ready and they helped stabilise the poured shaft. At the same time, it was a perfectly safe means of access for the workers in line with Norway’s strict safety regulations.
Steel plates of various sizes were required on the outside tower walls to weld on the steel girders of the steel skeleton after concrete works finished. This posed quite a challenge to formwork detailing, as the climbing cones for the KLK climbing scaffold had to be positioned without coming into conflict with the steel plates.
Mobile column, flexible slab solution
The columns of the underground parking were poured with the CaroFalt column formwork, which can be folded open and literally wheeled to the next position. The slabs were done using the MevaDec slab formwork. The slabs of the first three floors had some openings. Here MEP shoring towers up to 5.4 m high were used to support the MevaDec for the next higher slab above the opening.
Take the lift
To speed up work flow, an elevator was operated on the building’s outside. Workers could lift their material and work on the lower floors while pouring the floors above them was still in progress.
Planning for more on Opera Quarter
The project shows that if planned and organized in a clever way, the use of formwork to pour concrete structures on site can be time-saving and efficient. BundeBygg´s construction team was so pleased with MEVA solutions that the decision to continue Opera Quarter with MEVA came fast. And unanimously.
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