Remedial Base Grouting of Caissons under Artesian Conditions-Video

Video Transcription

Video Summary

A senior project manager describes remedial base grouting beneath king piles at Toronto’s Forest Hill Station, part of the Eglinton Crosstown LRT. Disturbed, relatively loose soil and artesian groundwater conditions prompted permeation grouting to stabilize the pile bases. Because of reinforced concrete, utilities, limited access, and the need to keep surface construction moving, the team worked from a nearby tunnel. They installed nine angled, multi-port grout pipes at four locations, using staged drilling and pressure grouting. Quality checks included alignment surveys, grout testing, pressure and flow monitoring, and structural monitoring. The work injected about eight cubic metres of grout and finished without delaying the contractor’s schedule.

Keywords

base grouting

king piles

permeation grouting

artesian groundwater

Eglinton Crosstown LRT