Saturday, August 27, 2011

Doesn't get any better than this...

Raising a Town Lattice bridge truss by hand with good help... priceless! I don't know about other people but I  never get tired of looking down a row of pegs in a cambered truss. Wow!

Very nice raising. All went as planned. Even the weather cooperated!
Again the Gin Poles did their job.
How the simple Gin Poles work is a puzzle to many so I think they deserve two pictures. It is hard to see but the cable is anchored at the top of the pole. Brought down and attached to the top chord of the truss then taken back to the top of the pole and through a fixed pulley. The cable then back to the bottom and attached to the winch. Milton and his son's used 7 of these at one time to raise the 240 foot truss that they built in 1978 - 1979 in  Frankenmouth, Michigan for the Zehnder family. Tomorrow the deck.

Puzzler - Then what and how?
Tech Vocab - Fixed pulley, Movable pulley, First class lever, Second class lever 

No comments:

Post a Comment