Jack London Square Boardwalk

Our investigation included a survey of the boardwalk on foot and by boat. We observed and concluded that:

• The plank condition created a walking hazard due to warping, shrinkage, loose nails, and large gaps
• Cantilevered steel tube beams exhibited corrosion and section loss
• Spalls and cracks in supporting cast-in-place concrete beams and precast concrete piers was attributed to reinforcement corrosion due to chloride contamination

We developed a rehabilitation program and our work included:

• Testing of repair techniques with input from in-house materials scientists
• Specifying replacement of wood planks and joists with pressure-treated lumber
• Designing a new restraint system parallel to the boardwalk to increase seismic resistance
• Estimating extent of corrosion and evaluating the remaining beam capacity at Area 8 to support design loads
• Estimating extent of beam corrosion prior to repair of Area 8 using ultrasonic testing along with destructive testing and recommending the drainage of seawater that filled the tube beams through erection holes and sealing of beams to minimize further deterioration
• Providing order-of-magnitude and detailed cost estimates
• Reviewing contractor submittals, drawings, and specifications and performing structural observations for Area 8