Stairwell as an eye-catcher

Class SB3 architectural concrete with Mammut XT and alkus all-plastic facing

Data & Facts

  • Project
    • The Terrace, Berlin (DE)
  • Principal
    • ANH Hausbesitz GmbH & Co. KG, Arnsberg (DE)
  • Architects
    • AHM Architekten BDA, Berlin
  • Contractor
    • ANES Bauausführungen Berlin GmbH
  • MEVA systems
  • Engineering and support
    • MEVA Schalungs-Systeme GmbH, Berlin office

Eye-catcher in SB3 architectural-concrete quality.

Lift shafts and stairwells can be more than just a means to an end. In an office building in Berlin they serve as an eye-catcher in SB3 architectural-concrete quality. ANES Bauausführungen Berlin relied on material from MEVA – not only in this area.

Directly on the bank of the Spreebogen where the River Spree meanders through the vibrant district of Charlottenburg, a stepped building, The Terrace, is coming into being. The office building in a prime location, with a slightly kinked, rectangular floor plan, consists of an underground garage, a ground floor with a food service area and seven upper floors with a height of 3.48 metres each. Large terraces and all-round, overhanging balconies serve as viewing platforms. Due to the stepped storeys, office space ranging from 200 to 700 m2 is available from top to bottom. The stairwells and lift shafts in attractive SB3 architectural concrete nicely fit in with the pleasing overall appearance.

The project team relied on the cost-effective Mammut XT wall formwork to build on a large scale, with forming areas up to 8.75 m² (350 x 250 cm). This is a convincing system solution, not only due to its high capacity for rapid concreting processes. The symmetrical, internal layout of the tie holes produces a completely homogeneous, uniform tie hole and joint pattern – whether for vertical, horizontal or combined applications. The selection of panels with heights from 350 to 125 cm and widths from 250 to 25 cm allows the formwork to be adapted to the geometry of different floor plans while also minimising the filler areas. Through meticulous work, experience and carefully selected formwork material, ANES foreman Frank Bartl created the walls in optimum SB3 architectural-concrete quality that did justice to this challenging project.

In Berlin the Mammut XT formwork demonstrated its flexibility and comfortable handling properties to the full. The clever multi-function profile made of closed steel profile with welded-in Dywidag nuts allowed attachment of all accessories such as scaffold brackets, push-pull props and alignment rails with only one single part, the flange screw. The alkus all-plastic facing fitted as standard does not absorb water, and does not swell or shrink. It can be nailed, is easy to clean and guarantees top-class concrete quality even after more than 1,000 applications. The hot-dip galvanised, closed steel profile and the clever facing are easy to clean and are quickly ready for the next cycle. A further advantage of Mammut XT is the unique combination tie hole integrated into the frame. It makes it possible to comfortably select between three tying methods in one system with a flick of the wrist.

On this construction site the single-sided tying method with XT taper ties without plastic tube was employed primarily to ensure rapid progress of the construction work with minimum manpower. It is particularly suitable for walls with uniform thickness. There was no need to use flange nuts, plastic tubes, tools and scaffolds on the initial-formwork side. It was only necessary to quickly change over to two-sided tying with DW 20 tie rod and plastic tube in corners and other constrained areas.

The underground garage was formed against the earth wall using tried-and-tested Mammut panels, partly by means of single-sided formwork. The walls were braced using STB 300 support frames. In addition, ANES used the modular Triplex SB braces for vertical load transfer. The underground garage’s entry ramps were quickly formed using the flexible Radius circular formwork. The Circo column formwork proved its worth when forming individual columns and wall closures. The easily assembled CaroFalt came into play as column formwork.

 

Photos © AHM Architekten BDA, Berlin (D)