Wednesday, December 21, 2011

Layout Progress as of 12/21/2011

I have decided to go with the full length seven-span Etowah River bridge as discussed in the previous update. With the bridge length determined, I had to add support to the roadbed at the north end of the structure. Eventually, the spline roadbed will be cut away and replaced with a 42" length of aluminum channel. The deck girder bridge will then be built in place around the channel and cast plaster piers will be added below.

» Photos

This "before" photo shows the original roadbed support before the bridge length was determined:

This "after" photo shows the additional benchwork constructed, including the riser that supports the roadbed at the north end of the bridge:

The additional benchwork will also support the 1/4" plywood that will make up the river bottom.