Case Studies

Commercial Foundations Case Studies: Mercury Lane Bridge Road Leveling

Monday, June 24th, 2019 by Franz Froehlich


In May of 2011 Saber was contacted by the City of Brea, CA department of Public Works to inspect and give recommendations to level an existing sunken roadway bridge abutment located on Mercury Street.

It was determined that the adjacent roadway had settled 1.5” below the bridge abutment and would continue to settle due to heavy vehicle traffic and poor soil conditions.

Two options for repair that were discussed: complete removal of the existing roadway and compaction of soil and replacement vs. injection of polyurethane grout below the roadway slab to fill all voids so as to raise the roadway back to the original elevation while also compacting the underlying soil. 

Polyurethane resin was selected as the preferred option, not only from an economical standpoint but the need to keep the bridge and roadway open and in service.


Using a two-man crew, a series of 5/8” holes were drilled through the existing slab for placement of injection ports. 1,050 lbs of Dual Component Structural Polyurethane was injected from a Graco E30 pump into the ports and subsequently under the roadway slab for the required 1.5" of lift and leveling.

The entire repair process was completed in less then one day while keeping roadway and bridge operational and open to traffic.

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