E.T. Techtonics brand fiberglass bridges by CPI can be assembled and installed in a variety of ways depending on the difficulty of your site. Spans can be shipped to you fully assembled, partially assembled, or in component parts:
Most fiberglass bridges are constructed with no more than a socket wrench and a few common hand tools. All components arrive precut and predrilled, and customized assembly instructions with drawings are provided to show exactly how to assemble the bridge onto foundations. Typical connections are 3/4" diameter A307 hot dipped galvanized bolts. All hardware required to assemble the span is included with the shipment. Just line up the holes, insert a bolt and tighten the nut. Most spans are designed to be assembled without any power equipment. A list of recommended tools required will be included in the assembly instructions.
Long Spans on Shallow Sites
On shallow sites the easiest method is to construct several temporary supports in the streambed using construction lumber or commercial scaffolding and then build the bridge in place. Bottom chords, posts, diagonals and top chords are sequentially added until the bridge is fully constructed on your foundations. Then supports are removed and decking is added. A step-by-step set of assembly instructions will be provided and this type of assembly is appropriate to volunteer groups with experience using hand tools. An 80’ foot span can be easily assembled by this method, with a small work crew or volunteers, in about 2-3 days.
Long Spans on Deep Sites
Installations in these locations are best done by experienced trail crews or other skilled workers. The usual method in forest locations is to assemble the trusses adjacent to the site and pull them across individually by use of “high lines” attached to nearby trees as shown below. Rigging experience is required. In other locations it may be possible to bring in a small crane to lift the assembled span into place on the foundations. On some very difficult sites a small helicopter lift may be the best method.