The vibroflot — a cylindrical steel unit weighing up to four tons with eccentric weights spinning at 1800 rpm — descends into the ground under its own mass, assisted by water jets that fluidize the surrounding soil. In Vancouver, where the Fraser River delta blankets much of the city with loose, saturated sands up to 30 metres thick, this equipment does more than compact; it rearranges the grain structure into a denser state capable of resisting seismically induced liquefaction. Our team configures probe spacing, dwell time, and amperage draw based on site-specific targets derived from CPT testing data and the city's seismic hazard model. The goal is always a uniform relative density exceeding 70%, verified by post-treatment cone penetration tests before structural loads are introduced.
Achieving 70% relative density at 18 metres depth in Fraser River sands requires probe spacing calibrated to CPT tip resistance — generic grids fail in stratified deltaic deposits.
