丨德国丨Kugel Architekten

Adaptable cable canopy

Koblenz, DE

Client

University of Koblenz

Architecture

Kugel Architekten

Scope

Structural planning for all project phases

Materials

Steel, membrane

Area

120 m²

Planning period

2023

2024

Experimental construction for the optimization of retractable membrane structures.

Prototype for research

Cities are increasingly suffering from extreme heat waves due to climate change. The ongoing global warming amplifies the so-called "urban heat island" effect, where urban areas heat up significantly more than rural surroundings. Various research reports have identified adaptable membrane roofs as an effective measure for cooling urban spaces. These mobile canopies offer a significantly better cooling effect compared to stationary roofs. During the day, shading reduces heating, while at night, an open membrane allows for particularly effective cooling. According to the laws of thermodynamics, the heat exchange via radiation between the heated components and the clear night sky results in much stronger cooling than with covered components at night. Open urban spaces and courtyards at night also allow for stronger airflows, which dissipate additional heat.

The retractable textile canopy: An innovative solution

Our retractable textile canopy is a location-independent construction that serves as an experimental setup to clarify technical and aesthetic questions. With a centrally retractable membrane and an area of approximately 112 m², this solution is suitable for many urban situations.

Design and construction

The system is based on an elliptical geometry with an axially symmetrical membrane shape. The central mast functions as an air support and is tensioned with radially arranged cables. Together with the upper load-bearing cables, a pre-tensioned "spoked wheel" in an elliptical shape is created. The membrane is suspended from the upper spoke cables and can be moved via a central drive mechanism and reefing lines. This drive technology is located at the top of the air support and also serves as rain protection for the folded membrane in the open state.

Functionality and added value

The membrane roof provides a weather-protected outdoor area in close proximity to the students' workshops and workplaces. Beyond the experimental series, large experimental models can be erected and tested under the canopy as part of various courses. The weather-protected outdoor area can also be used for additional events, contributing to the attractiveness of the university campus. Furthermore, the experimental construction can be set up elsewhere and used, for example, as a mobile pavilion in an urban square to showcase the university.

Certification

During the planning process, the construction was fully certified as a "Flying Structure" according to EN 13814:2005 by TÜV. This makes the construction largely location-independent and it can be set up almost anywhere in Germany. This underscores the safety and reliability of our innovative solution.