DESIGN OF TRUNNION-HUB GIRDER ASSEMBLIES FOR BASCULE BRIDGES

Committed to bringing numerical methods to undergraduates

Home | Grant 1: (98-01) | Grant 2: (01-03) | Grant 3: (04-05) | Pictures | Links

Assembly Procedure 2

Trunnion, Hub and Girder

Hub fitted into Girder

Trunnion fitted into Hub-Girder

Completed THG assembly

Hub in Girder Assembly

The hub is lowered into the liquid nitrogen dewar*

The hub is taken out of the liquid nitrogen dewar after the hub reaches a temperature of below -315 F

The cold hub is being lowered into the girder hole.  The hub is shrink fit into the girder to give the hub-girder assembly

Trunnion in Hub-Girder Assembly

Heating Blankets were used to raise the temperature of the hub-girder to 200 F

The cooled trunnion is taken out of the liquid nitrogen dewar to be shrink fit into the hub-girder assembly

At steady state, the whole trunnion-hub-girder assembly was raised to show the shrink fit.