University of Lucerne

University of Lucerne

Enzmann & Fischer AG

Starting with the Lucerne Central Station, which was built in 1985 by the architectural bureau Ammann und Baumann and its employee at that time, Santiago Calatrava, the city of Lucerne began a radical modernization of the quarter stretching eastwards from the station to Lake Lucerne. The Culture and Congress Center designed by Jean Nouvel, with its wide overhanging roof, has stood at the lakeside since 2000, and directly next to it, the University’s new main building has recently been completed.

Instead of a new building, it is a renovation of the former post office, around which an unusual three-dimensional façade has been placed. The white shell appears to have been intricately folded from the second floor upwards around the five-story building, which commands over 290,625 square feet of usable floor space. The plasticity of the rear-ventilated façades is further developed by panoramic windows which project 95 centimeters outwards from the façade twisting in alternate directions. According to the architects, the design of the façade has historical references, such as the solar panels for satellites which Koryo Miura developed in the 1960s, inspired by the Japanese art of origami, or the art of Andreas Christen, who cast large white reliefs out of polyester in the same time. Similar angles can also be seen in the façades of Marcel Breuer’s buildings Flaine, a French ski resort. The composition of the university building’s façades also has similarities with Holabird and Roche’s Tacoma Building (1887-1889) with its angled bay windows.

A striking complete makeover of a former post office building

During the competition phase, the architects Enzmann & Fischer had planned a façade consisting of concrete curtain elements, which turned out to be too heavy for the existing frame and too expensive. Now thin carrier plates made of multi-polished, triple-polyurethane-coated, recycled glass in an aluminum frame are suspended from the restructured former post office building. The StoVerotec system was the foundation, which the architects came across while searching for a lighter alternative to concrete. Working closely with Sto AG and GKP Fassadentechnik, Enzmann & Fischer was able to develop the artistically conceived shell for the university building - including flush-set window solutions based on Reynaers CS 86-HI window and door system. This high insulated three-chamber system proved to be perfectly suited to the complex construction system. A fixed-glazed segment has been combined with two movable windows, together with measuring up to 13 x 7.5 ft. and weighing up to 1330 lbs. Standard supports are insufficient for this weight, so it was necessary to design a bespoke solution. To achieve the appearance of window surfaces made entirely of glass, silicone glazing was used on all window frames – requiring the development of another bespoke profile which is SSG anodized in the sealed areas. Without the use of high-performance building components in the façade construction, such as high insulating aluminum profiles in combination with eco-friendly energy management (heat pump and biomass energy supply) the building would not have met Minergie standards (the Swiss standard for energy-efficient building).

Ensuring that this façade construction was accurate down to the last centimeter required close collaboration from all parties - from the first idea to the installation of the final handle. The regular meetings held during the tender process increased in frequency once the executing company was chosen. In particular, the coordination of the dimensions of the façade construction and the windows required intense effort on the part of everyone involved. But it takes this level of commitment to transform a well-conceived design idea into a perfectly built reality in such a prominent location as this one in Lucerne. The precision with which the custom surfaces, sharp corners, and perfectly installed windows were constructed is nothing short of impressive. Together for Better.

Sections window element

Project solution:

System: bespoke solution based on CS 86-HI

Project Description

  • Bespoke solution based on CS 86-HI window and door system
  • Highly insulated system (Uf up to 1.4 W/m²K) to reach the buildings Minergie label (Uw ≤ 1.0 W/m²K)
  • 69965 ft² building façade of which 23680.6 ft² windows
  • Window elements were prefabricated at the workshop including glazing
  • Window elements were mounted without visible fixation
  • 3dimensional look by using inclined window setting
  • The distance between the wall and the most protruding façade parts is 37 inches

Window elements:

  • 200 elements with combination of fixed & opening parts
  • Glass weight up to 1322 lbs
  • Max. 160 x 90 inches
  • Possibility to easily replace glass
  • WKII burglary proof

Opening parts

  • 340 vents
  • Weight up to 286 lbs
  • Inside opening turn
  • Partial vents for SE (Smoke & Heat Evacuation) motorized

Glazing

  • Triple glazing
  • SSG: profiles were anodized to guarantee quality of adhesion

A-A’: vertical section opening and fixed elements
B-B’: horizontal section opening element
Fabricator: 
Surber Metallbau AG
Architects: 
Enzmann & Fischer AG
Location: 
Lucerne, Switzerland View on map
Photographer: 
Bruno Rubatscher Dany Schulthess
Other partners: 
Financial department of canton Lucerne (Rafaela Fu (Investors)
Project solutions: 
CS 86-HI/HV bespoke solution