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The Skyliner II, the sister skyscraper of the office complex in the heart of the capital city’s Wola district owned by Karimpol Polska, has already got a strong foundation. This means that the foundation works have just been completed. The general contractor, Warbud SA, has just concreted the last working section of the foundation slab at a depth of 22 meters. Work on the underground section of the building is entering the next stage. The building whose foundation was built using the top-down method, will soon reach ground level and immediately afterwards, construction of the above-ground part will start.
The Skyliner II is being built in the demanding conditions of dense urban development. The use of the top-down method consists in building floor slabs on the ground and then excavating the soil beneath to the levels of subsequent floors until the target foundation level is reached. The floor slabs are supported by temporary columns and anchored in the diaphragm wall which they push aside, ensuring its stability. The building’s foundation consists of a slab with a thickness ranging from 1.9 to 4.9 metres and 4,700 m³ of low-emission concrete mix. The loads from the slab are transferred to a significant extent to the ground by means of barrettes reaching a level of almost -39 metres in relation to the site ground level. Nearly 40 people worked on the construction of the Skyliner II basement - steel fixers, carpenters, foundation slab insulation specialists and underground equipment operators.
‘The Skyliner II draws on the experience we gained during the construction of the first tower, thanks to which the modifications we introduced such as those affecting the barrettes and strutting floors, give a much better response to the challenges related to project implementation in this particular location. Each phase of this construction process requires careful planning of site logistics which includes not only deliveries but also a streamlined setup of the site facilities and the work schedule of construction teams. We are glad that the work is being carried out according to the schedule,’ commented Szymon Zduńczyk, managing director and member of the management board at Karimpol Polska.
One of the challenges caused by the proximity of the intensively used Daszyńskiego Roundabout and the presence of tenants in the first Skyliner tower, was to organize daily deliveries of materials to the construction site which takes place via Prosta Street.
‘The construction of the Skyliner II requires unique technical solutions because of its location in the vicinity of the existing development including other skyscrapers. The limited area of the construction site and the proximity of other buildings up to 195 metres high require the use of tower cranes with a tilting jib, which allows operators to perform safe manoeuvres in these conditions. We installed one of the cranes on the foundation slab, the other on the ground floor slab,’ says Marcin Hoyer, site manager at Warbud SA.
Work is now focussed on building the basement levels which will constitute the basis for further phases of the project. In the next phase, a common podium with an area of 4500 square metres will be built. It will connect the new tower with the first Skyliner complex building. Then work will begin on the construction of the repeating floors which will ultimately create a 28-storey-high structure, providing modern office space in the very centre of Warsaw. The 130-metre-high Skyliner II is scheduled for completion in late 2026.
The architectural design of the Skyliner II was prepared by APA Wojciechowski Architekci, while the project is managed by Hill International on behalf of the Investor. The CBRE Poland team are responsible for the commercialization of the second tower.