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The Through Truss Series is for a high or box truss bridges.

It involves the addition of sway braces and portal frames (transverse bracing) to low truss bridges which increases their span capability.

This extends their applicability to clear-span longer gaps.

In doing so, the vertical clearance above the bridge's roadway sets the truss height. 

Because of the deeper truss girders, shipping of full-depth pre-assembled sections is much more difficult and many times not available.

 The pre-assembly is usually limited to attaching gusset plates to the chord members with vertical and diagonal members being added in the field.  

This requires more planning by the contractor to assemble the truss girders and move them into position

Video - 12.9m long bridge Double Lane

shows Panel two being installed ..see above



Video below - 18.5m long Single Lane Bridge

shows panel one being installed 


Guardian prefab abutments installed before closing road;     then road closed, Pony Truss bridge removed, new prefab bridge installed in 1 day


Certified Welding Bureau

Welding Instructor

Welding Inspector

3rd Party Welding Engineer Retainer

Western University

Collaboration with Jia Xue Ph.D 



















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500 James Street South, St.Marys Ontario Canada N4X1B4
500 James Street South, St.Marys Ontario Canada N4X1B4