Suspension Draw Bridge (retractable) Demo of model (Version 2)

This 1"=1' scale model demonstrates the improved design for a bridge that spans a 70' river. The total suspended weight is about 20lbs/lf (1,400lbs for this bridge). Each deck section weighs 100lbs and is held in place with only gravity. Deck platforms are 4' wide x 5' long and towers stand 18' high. Suspension cables are galvanized aircraft cable (3/8" 7x19) with a tensil strength of 14,000lbs each. Total material costs is estimated at about $7,000 or $100/lf. Assembly is simplified with completely modular components and a technique for initial construction is very easy.

Category:

Science & Technology

Tags:

• Suspension
• bridge
• demo
• model
• drawbridge
• draw
• retractable
• temporary
• seasonal
• engineering
• suspended

[gsgriffin]

More can be seen at the Facebook page called "Retractable Suspension Bridge". The actual bridge was constructed in 2008. It has since been retracted and extended twice. Each time, it took about 2 hour for 4 people to complete. Bridge is still performing well and due to the severe winter condition in northern Montana, it is expected to survive longer with the decking sections stored inside each winter.

[gsgriffin]

The actual bridge has now been built and works EXACTLY like the model...but 80' span instead of 80"

[Hotsvensk]

Really cool. 

[johnsonquiver]

Amazing, look forward to putting it back together in a few weeks!

[xbox7888iscool]

lol thats cool