Monday, October 21, 2013

Continuous Warren through truss bridge

A few weeks ago I traveled to Kentucky for an inspection of a Continuous Warren through truss bridge. The truss was built in 1985 (same age as me!). The bridge is in good condition which is surprising since I am use to the corrosion in New England.

The bridge has a total length of 2,314.4 feet with the main span over the Ohio River spanning 740.0 feet. The deck has a width of 44 feet and carries 13th Street one way traffic northbound with three lanes.


It was my first experience with tv news crews being interested in an inspection, sure enough we made it onto the new that evening with video of our lane closure before we asked them to kindly leave our traffic pattern.

Using limited equipment the majority of the inspection was done using rope access or free climbing. The vertical members were inspected by rope with drops up to 84 feet. The top chord was inspected using a simple flip line and always remaining 100% tied off. The chord consists of built up welded members and gusset plates.