The Iconic inflatable roof of the BC Place Stadium in Vancouver, Canada – aka the “giant marshmallow” – was finally deflated last may.
The existing pneumatic dome is to be dismantled and replaced with a partially fixed, partially retractable fabric roof as well as a transparent membrane façade.
When completed, this roof will be the largest cable-supported retractable roof in the world. The projected area of the retractable portion of the roof is approximately 6,700m², requiring a total of approximately 13,400m² of membrane material.
The project’s estimated budget is $458 million, and it is scheduled for completion by summer 2011.
The new roof would cut energy costs at the stadium by one quarter, or about $350,000 per year.
A model of the new roof:
The project was designed by Stantec Architects Ltd, with structural engineering being provided by Geiger Engineers, New York, USA and Schlaich Bergermann & Partners, Stuttgart, Germany, supported by specialist consultants from Tensys.
The entire retractable roof and the fixed façade for the stadium is supplied by the Hightex GmbH in Germany – a world leader in the design and construction of retractable roof systems.
The fixed roof will be completed by FabriTec Structures, a brand of USA Shade & Fabric Structures – an award-winning full service
design/build organization specializing in tensile membrane structures.
From Hightex’s web site:
The contract will involve the fabrication and installation of the complete retractable portion of the membrane roof system in Tenara membrane, a woven, high translucency PTFE fabric, as well as the façade system to be fabricated from a transparent membrane with a light-controlling frit pattern. The design work will commence immediately, with completion planned to take place in mid 2011.
The new roof substructure consists of radial cable net and outer steel columns. The fabric roof is divided up into 36 fixed outer panels and 36 inner retractable segments. The outer fixed roof, to be the subject of a separate contract, has an area of about 34,000m². The inner roof will consist of a double layer Tenara membrane with an inflated inter-space to form “cushion” elements.
The cushions will be pre-stressed using hydraulic tensioning units and inflation via fan units. The retractable roof will be connected to the 36 radial cables by specially designed sliding and driving carriages. The deflated cushion will be stored at the centre of the roof in a membrane garage. To close the roof, the driving carriages will pull the membrane outwards radially towards the perimeter. The retractable roof is made of a highly translucent fabric which will allow the fabric to be folded without damage.
The new façade comprises some 6,000m² of transparent membrane panels using ETFE. The facade panels are pre-stressed using metal arches and are attached directly to the primary steel structure.
The deflation of the BC stadium – Time Lapse:
The deflation seen from the inside:
October 20, 2010 - 4:00 PM Comments: Closed