Pennybacker Bridge

 

Ashtabula Liftbridge

 

 

 

Florida Avenue Bridge

Adjustable Wrench

-          Cannot be bent due to stress on the cables supporting the roadbed.

-          The entire bridge can be lifted from one side.

-          Lift can be sustained at three varying severities, supported by friction.

-          Lift or Draw bridge can be installed with varying degrees of axial distribution.

Vice Grips

-          Multiple-hinged mechanism makes a complex pulley system possible to divert shear stress perpendicular across the cables.

-          Multiple hinges offer multiple solutions.

-          Ex. Swing, Lift, Draw

-          Multiple hinges offer multiple solutions.

-          Ex. Swing, Lift, Draw

Tie Bar

-          All 72 cables must be kept in equilibrium/tension, not to be contorted in any way.

-          The roadbed cannot be lifted any way that is not straight up.

-          Entire bridge can be lifted from one side.

-          Simple, single-hinged mechanism.

-          Truss construction makes any lift construction simple to install and employ with ease.