I just finished this bridge a few days ago after working on it on and off for 3 months. It’s a cable stayed bridge design made with standard round toothpicks and wood glue.
The bridge is 31 inches long and just under 20 inches tall. The main road truss is 2 inches by 2 inches, constructed of beams of laminated toothpicks (3×3) and held together by individual toothpicks in a triangular truss pattern. The towers were constructed of laminated toothpick beams as well, but thicker (4×4). Then the suspension was created with 4 strands of thick string wound back and forth across the top of the towers.
I didn’t make this for any particular occasion or contest; I just wanted to see if I could make a sturdy suspension bridge. I’ve built a toothpick bridge before. It won a contest by supporting 350 lbs. over a two foot span, but obviously it was destroyed in the process. I don’t plan on testing this one, although I imagine that someday my curiosity will probably get the better of me. Besides, I really don’t think this bridge will hold nearly that much weight. I’d love any comments or pointers you guys might have. Enjoy!
There are a few more pictures of this bridge (higher resolution too) on my Flickr photostream at http://www.flickr.com/photos/razokylava/ I’d love any comments or pointers you guys might have. Enjoy!