Kaiser Carré Siegburg

New construction of a combined commercial and residential building on a ­constricted building site

In the heart of the German town of Siegburg, the Kaiser Carré, a combined commercial and residential building, is coming into being in the highly frequented pedestrian zone. The difficult access to the construction site and the completely built-over planning area require well-thought-out logistics solutions and the lowest possible amount of material in total and stored on-site at any one time. Efficient solutions from MEVA supported MBN Bau GmbH during the project.

The objective is to breath new life into the centre of the principal town of the Siegburg district situated near Cologne. Hence, every square metre in Siegburg’s Kaiserstraße is valuable and put to good use. After completion in 2024, the Kaiser Carré, which is being built on a 2,825 m² plot of land, will offer new opportunities – with an underground ­garage in the basement and seven upper floors (plus a three-storey plant building). The height of the individual storeys ranges from 2.80 to 4.80 m. The ground floor and the first floor together provide 4,400 m² of commercial space. The second to the sixth upper floors house a total of 69 residential units with almost 5,400 m² of living space. They have a U-shaped layout enclosing a green inner courtyard. The two top storeys are planned so that the upper storey is set back relative to the storey below. MBN Bau GmbH is erecting the building complex quickly and strictly in accordance with the time schedule.

Mammut 350 for SB2 architectural concrete

To pour the walls, the MBN team led by the construction managers Sven Sage and Lena Trienekens is relying on Mammut 350. The formwork system is playing to its strengths during the Kaiser Carré project. It is easy to set up and efficient (full-surface fresh-concrete pressure up to 100 kN/m²) and enables pouring heights up to 3.5 m without height extensions. When assembled into large panel formats, particularly short pouring cycles for wall surfaces and heights up to 4 m are achieved – and thus rapid construction progress. The standard alkus all-plastic facing is ideally suited for the SB2 architectural-concrete surface finish required and, in conjunction with the symmetrical joint and tie hole pattern of the formwork, enables a visually appealing result to be achieved.

Work safety is guaranteed by a total of 50 KAB foldable working platforms with integrated platform planking and folding railings. They can be stored in a space-saving manner and can be transported efficiently. The KAB is used directly from the stack and – without tools or loose parts – quickly assembled with a minimum of effort. If lifted by crane, the platform itself folds out and locks automatically in the open position. The formwork can be placed on the platform and also supported by it.

Columns formed using CaroFalt

The building’s columns are being formed using CaroFalt: Four identical panels are hinged together like windmill vanes. The system is thus deployed quickly and can be set up flexibly to suit the desired cross-section of the columns. Thanks to the alkus facing, architectural concrete quality is also produced here. Like the Mammut 350, CaroFalt is also able to withstand a fresh-concrete pressure of 100 kN/m² and thus enables a high rate of pouring in conjunction with high pouring heights. Integrated safety functions such as the working platform with integrated access ladder ensures that the project runs smoothly. After stripping, the complete unit is simply moved to the next place of use by means of clip-on castors or to the next storey of the building using a crane.

MevaDec and MevaFlex

The slabs were formed, depending on the requirements, using MevaDec and MevaFlex. The slabs from the basement up to the first upper floor were formed using MevaDec. Time and time again, the drop-head-beam-panel method has proved to be advantageous on confined building sites like the one in Siegburg. Large surfaces are formed quickly with very little material and low storage requirements. The primary beam and formwork panels are stripped earlier and used for the next pouring cycle, while the props still support the previously stripped slab. During the construction of the Kaiser Carré, MevaFlex is being used from the second upper floor upwards to support the filigree slabs supplied.

On the construction site in Siegburg, the modular MEP shoring tower system serves to support the high slabs in the plant building. It can be flexibly adapted to suit the building geometry, without an inconvenient “forest of props”. A stable shoring tower is simply erected using only a few basic parts and the frame. MEP enables flexible height adjustment in order to support slab formwork, slab tables, concrete beams or prefabricated components at heights up to 21 metres. In addition, the stable MT 60 shoring tower is used to reliably support the balconies.

The construction work at the Kaiser Carré is on schedule and the construction managers Sven Sage and Lena Trienekens are satisfied with the progress of the construction work.

MEVA systems:

• Mammut 350 wall formwork
• CaroFalt column formwork
• MevaDec, MevaFlex slab formwork
• MEP, MT 60 shoring tower system
• KAB foldable working platform
• EuMax propKlapparbeitsbühne KAB

Contractor:
MBN Bau GmbH, Bonn, Germany

Principal:
Kreissparkasse Köln, Germany

Project management:
PARETO GmbH, Köln

Project:
Kaiser Carré, Siegburg, Germany

Engineering and support:
MEVA Schalungs-Systeme GmbH, Rhine/Ruhr office, Schwerte, Germany