You must be logged in and verified to contact the designer.
For a nominal 40' wide bridge deck you need this set of three cross girders to space the main girders. If you want a wider deck you can cut these apart to create single spacers, at a scale 12'-8" interval (and add additional main girders as required). You need one set per bridge pier, and you will need one set of concrete pylons to go on each outer end of the main girders. The end flange of the main girder is meant to butt up against the vertical tabs on the left and right ends of these spacers.