Posted by Bryce Hanna on February 19, 2004 at 14:44:02:
In Reply to: Theoretical glass walkway proposal--HELP!! posted by Nikki on February 18, 2004 at 13:38:17:
You should definitely consider a laminated glass system. Typically these are heat tempered sheets of glass that are glued together with a plastic-like "interlayer" (typically poly-vinyk butyl). Structural laminated glass is a bunch of layers forming a plank that can be several inches thick. A realistic solution may be to structurally subdivide the 15' width into three 5' sections so that the roof of your tunnel is a grid beams that measures 5'x3', then use 36"x60" structural glass planks on top of that. A good example is the CN tower in Toronto which has 42"x50" panels that are about 2" thick. http://www.cntower.ca/attractions/l3_att_GlassFloor.htm
Rem Koolhaas designed an academic building called the "Educatorium" in Utrech with a huge glass floor, if you do a web search I'm sure you can find pictures, it's very dramatic, with very large panels. Pilkington is a glass company that makes a product called "Planar" which is a structural glass for this sort of application - you can view their information on the web. Also check out the link below - a glass bridge with a glass floor (in this case the floor has a blue tint - but you clould make it clear). Very cool project.
Types & Styles
Library Places Building Photos Free 3D Models Archiplanet