Alexander Berlins Capital Tower – PORR Design & Engineeri

Alexander Berlins Capital Tower

A flagship project in city planning: the ABC tower. The tallest residential building in Berlin was designed by architectural practice Ortner & Ortner Baukunst, while PORR Design & Engineering was responsible for the general planning. From 2021, the tower with its glass facade will house a shopping centre, fitness areas, apartments and offices.

Client
MonArch Dritte Projektentwicklungsgesellschaft mbH & Co. KG
Project duration
11/2015 to present
Planned completion
expected for 2021
Period of service for PDE
Work phases 2–4
Dimensions
34 storeys above ground, 4 storeys below ground, height 150 m, gross floor area 42,000 m²
Certification
LEED Gold

Landmark in the heart of Berlin: The central location of the Alexander Tower has its advantages, but also presents some challenges. For instance, the traffic situation in the Alexanderplatz intersection was a major factor in the planning of this flagship project.

The Alexander Tower: Flagship project in the nation's capital city

The ABC tower is part of the comprehensive renovation of the Alexanderplatz in Berlin. Little wonder that one of the tallest residential buildings in the city places high demands in terms of design and construction implementation.

 

The design by Ortner & Ortner Baukunst features a pronounced grid pattern effect. The effect of the stacked elements is highlighted by criss-crossing lines across the facade. PORR Design & Engineering employed Building Information Modelling during Work phase 2 in order to realise this artistic vision.

 

The close proximity to an automobile tunnel and an underground railway tunnel necessitated additional professional reports and simulations, and meant that the foundations constituted one of the central challenges. This residential tower is located within the radar range of German air traffic control and, owing to its height, will throw a shadow over the radar guidance area. This means that perfect coordination of the facade planning was necessary to satisfy the requirements of the radar experts, the design specifications and the economic interests of the investors. Solution approaches were developed in the course of an intensive coordination process between the structural engineering and geotechnics teams.

 

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Roland Przybilla, project manager for planning

Top performance in a difficult location

The ABC tower is an unusually complex construction project. “The client's desire to submit the building application before the design engineering was complete - all, of course, subject to consideration of construction costs and numerous other dependencies - was definitely a challenge”, stated project manager Roland Przybilla. The non-linear planning process necessitated the most accurate estimations possible, both in object and sectoral planning and tender management. “The fact that our staff were able to achieve this feat was a tribute to their many years of experience.”

 

The project was demanding in terms of infrastructure as well: the client was obliged to guarantee, to the greatest extent possible, the uninterrupted operation of the ALEXA shopping mall during the construction phase. To this end the team had to prepare a concept for the site facilities as early as Work phase 3, and secure the agreement of both the client, MonArch, and the operators of ALEXA. “An outstanding accomplishment”, recalls Przybilla. “We all had to pull together on the planning of this project.”