544
Schwungvoll gestaltete Fassade – Sanierung der Munich Re in München
2016 ¥ 6 ∂
J M assivbrüstungen vor Montage der Fenster K Konstruktiv entspricht die Gebäudehülle einer konventionellen Fensterbandfassade L Vertikalschnitt Regelgeschoss Maßstab 1:20 M Horizontalschnitt durch Brüstung bzw. durch Fenster Maßstab 1:20 N Innenecke mit Trockenputzbekleidung und inte grierter Wandflächenheizung im Brüstungsbereich O Außenecke mit hinterlüfteten, dunkel emaillierten Verglasungen im Brüstungsbereich
J
J Solid balustrades prior to assembly of windows K Constructionally, the outer skin of the building is a conventional strip-window facade L Vertical section through typical storey scale 1:20 M Horizontal section through balustrade and window scale 1:20 N Internal angle with dry lining and integral wall heating in balustrade area O External angle with rear-ventilated, dark enamelled glazing in balustrade area
K 1
2 3 4 5 6
7 8 9
1
2 3 4 5 6
7 8 9
Glasbekleidung ESG-H emailliert, rahmenlos rückseitig gehalten Hinterlüftung 50 mm Wärmedämmung 160 mm Stahlbeton-Halbfertigteil 180 mm Trockenputzbekleidung mit integrierter Wandflächenheizung 60 mm Stahlwinkel ∑ 250/120 mm gegen Brandüberschlag Folie diffusionssperrend auf Aluminiumblech 2 mm Zierblech Aluminium eloxiert 3 mm Blendschutz Verbundfenster Aluminium, als Drehflügel nach außen öffnend, mit Öffnungsbegrenzer auf 120 mm: Prallscheibe umlaufend mit Randbedruckung, zu Revisionszwecken öffenbar Raffstore motorisch mit Lichtlenkung Isolierverglasung Fensterbank Aluminium eloxiert Strangpressprofil ausgeschäumt seitlich geschlossen Stahlprofil tragend Verbundfenster Aluminium, als Festverglasung: Prallscheibe umlaufend mit Rand bedruckung, zu Revisionszwecken öffenbar Raffstore motorisch mit Lichtlenkung Isolierverglasung enamelled toughened glass cladding rear fixed without frame 50 mm cavity 160 mm thermal insulation 180 mm semi-precast reinforced concrete element 60 mm dry lining with integral wall heating 250/120 mm steel angle to prevent spread of flame diffusion-resistant membrane on 2 mm aluminium sheeting 3 mm decorative aluminium sheeting glare protection aluminium side-hung, double-glazed casement, outward-opening (max. 120 mm); impact pane peripherally printed, openable for maintenance motor-operated blind with light deflection double glazing foam-filled extruded anodized aluminium window sill, closed at ends load-bearing steel section aluminium double-glazed fixed casement; impact pane peripherally printed, openable for maintenance motor-operated blind with light deflection double glazing
1
2 3 4 5 6
b
b
7
a
a 1
4 L
In the 1980s, the Munich Reinsurance concern (Munich Re) acquired an office development originally erected for the Siemens Nixdorf enterprise for information systems. The Munich Re wished to use the complex as its head office. The existing building, with its high window balustrades and non-openable mirrored fenestration, represented neither a modern working environment nor a suitable corporate image. The use of the existing floor area was not efficient, and there was a lack of spatial variation. In addition, the extensive areas for data processing presented a structural problem. On the other hand, it would have been difficult to justify demolishing the building after only 25 years, not least because the structure was sound and the constructional grid lent itself to ongoing use with different divisions. A decision was made, therefore, to subject the development to a general rehabilitation and extension. In 2008, a two-phase planning competition was held which was won by the Sauerbruch Hutton office. To improve the exploitation of the floor area and to optimize the quality of the workplaces and recreational facilities, we proposed a series of measures, including the relocation of the main point of access to Berliner Strasse, which allowed the creation of a more impressive entrance situation. Other changes included the renewal of the outer skin and the construction of new atria. Atria and roof lights A partial demolition of the floors in the middle bays of the north and south wings led to the creation of covered atria that allow daylight to penetrate to the depths of the internal spaces. The atria also support natural cross ventilation. In view of the changes made to the structural system and the fact that the loadbearing capacity of the existing floor slabs was too low in some areas, reinforcement in the form of carbon/Kevlar strips was adhesive fixed to certain sections of the soffits. Based on the idea of covering the atria with a kind of saw-tooth, north-light roof construction, we found a solution with a glazing area of roughly 50 per cent that met the conditions for optimized natural lighting, thermal insula-