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SL-Rasch GmbH Special & Lightweight Structures
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SL-Rasch GmbH Special & Lightweight Structures's posts

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2012 - Crowd Simulation – “Temporary Mataf Ring Structure”
In the 1980s SL Rasch started to analyze the bottlenecks that occur in the stream of pilgrims on foot during the Hajj. Mathematical models were used to calculate the capacity of the Mataf area of the al Haram Mosque in Makkah. Simulation models helped to validate proposed structural measures. The continuous further development over the years led to efficient numerical methods such as the PedFlow / PedPress software package which is well suited to assess a complete pedestrian management design. The “Temporary Mataf Ring Structure”, which was recently installed in Makkah to accommodate the growing number of pilgrims and to assure their safety, is one result of these unique development efforts.
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2012 - Tents on top of the Abraj Al Bait Towers in Makkah
In the course of planning the biggest Tower Clock on top of the middle tower, the roof designs of the whole complex gained in importance. Since the structural planning of the whole complex had already been completed, and the foundations of the towers could not take any additional load, SL Rasch was asked to develop lightweight structures that were to cover the non-symmetrical polygonal roof floor plans of the towers. White tent structures crown the roofs now, they integrate the elevator machinery, and they are able to withstand the enormous wind loads at this height. At night they appear as glowing light sculptures against the dark night sky.
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2012 - Tower Clock on the Abraj Al Bait Towers, Makkah
SL Rasch has built the biggest Tower clock of the world. It is situated on top of the middle tower of the Abraj Al Bait Towers in Makkah. When the planning of the entire complex had already been completed, SL Rasch was entrusted with this specific and challenging task both as experts in lightweight and special structures and, moreover, experienced in interdisciplinary cooperation for decades. The largest clock of the world determines Makkah Time and thereby introduces a second time standard besides Greenwich Mean Time.
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2011 - 250 umbrellas for the Piazza around the Holy Mosque in Madinah
Shading and illuminating the large Piazza outside the Mosque in Madinah was a magnificent and unique town planning project, and a big challenge for the umbrella development team at SL Rasch. Based on their umbrella design for the courtyards, the engineers worked out an innovative umbrella prototype with a new folding arm system and a new, specially developed membrane material. All in all 250 umbrellas are positioned in groups of two to fifteen units, providing shelter from sun and rain for 300,000 pilgrims. With their integrated lighting units they also serve as lighting poles, spreading a smooth light carpet over the marble floors of the piazza.
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2008 - Validation of the fluid structure simulation software
During a unique engineering study SL Rasch succeeded in validating the numerical simulation. The study was specially developed to examine all aspects of wind-loaded membrane structures on a fully deformable umbrella prototype with a side length of nearly 29 meters. Since the results of the force and deflection measurements matched the results of the numerical simulation, the fluid structure simulation can be applied as an industrial design and engineering tool for lightweight structures.
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2002 - Projects for the Holy Sites in Makkah and Madinah.
Intensive research in Islamic art, and the expertise in designing complex lightweight structures, enables SL Rasch to develop a type of architecture, that blends in with important religious buildings, and enhances their status. The great number of assigned unique projects comprising Islamic design has given SL Rasch the opportunity to gather extensive experience in the application and processing of a wide variety of different technologies and materials. For the places of pilgrimage in Makkah and Madinah, SL Rasch has developed a style which tries to generate familiarity, appealing to all pilgrims as being characteristically Islamic, wherever they come from.
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2000 - Venezuelan Pavillion Expo
As experts in the field of convertible roofs, SL Rasch were asked to realize Fruto Vivas’ idea to create a pavilion as a symbol of the landscape of Venezuela.
‘A Venezuelan flower for the world' was the motto of Venezuela’s presentation at the World Exhibition in Hannover. 
In a common studio, Frei Otto and SL Rasch worked out the concept for the movable roof that opens like a flower blossom.
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1999 - Tent City in Muna Valley
After a devastating fire during the Hajj in 1997, where 30 000 tents caught fire and hundreds of pilgrims died, a solution had to be found to prevent such disasters from ever happening again.
SL Rasch develops twelve different types of fireproof tents, which are in conformity with traditional pilgrims´ tents, and meet the demands of pilgrims´ families.
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1992 - Lighting systems for the Madinah Piazza
While plans were under way to provide the piazza around the Prophet´s Mosque with umbrellas, SL Rasch develops a lighting system – integrated into the umbrella masts – which is able to illuminate an area of 200,000 sqm. 
This project marks the beginning of SL Rasch‘s working relationship with the lighting engineers at Bartenbach LichtLabor. Their enduring collaboration has yielded a number of innovative daylight and artificial lighting systems.
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1991 - Sliding Domes for the Prophet's Mosque in Madinah
SL Rasch develops and builds 27 “sliding domes” to cover the 27 small courtyards of the Prophet´s Holy Mosque in Madinah with convertible roofs.
These constructions follow an ancient Moroccan tradition, and their design is characterized by the sensational combination of traditional crafts and industrial prefabrication with innovative use of CAD.
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