Chemical Grouting to Stop Water Seepage into Utility Chamber

Location: Guelph, ON
Sector: Utilities
Category: Chemical Grouting

Description

Due to the high water table present in the region, an underground water main chamber encountered an unavoidable inflow of water through the precast segment joints.

Working within the chamber, a series of parallel holes were drilled directly into the joints voids at a depth of 4 inches between the precast segments. Packers were installed into the drilled holes and flushed with Water/Acid solution to rid debris from holes and the voids. Chemical grout was then injected into the joints, filling the void and creating a semi-rigid foam barrier.

Chemical grout injection using Multiurethanes Universal Resin, Universal Accelerator, 3/8″ plastic packers and two chemical grout pumps were used to seal the joints between the precast chamber segments. The technique eliminated the water leakage, allowing for the chamber to be returned to service.

Cement grouting in open trench

Soil Stabilization Program for Utility Contractor

Location: Toronto, ON
Sector: Utilities
Category: Cement Grouting

Description

An underground utility contractor encountered loose fill after initial exposure of an open trench excavation. A Hydrovac was used to vacuum excavate the trench daylighting locates when fill began to collapse into the trench from beneath the sidewalk and road.

From the perimeter of the trench, parallel holes were drilled at 3-foot intervals, at alternating depths of 10 feet and 5 feet. 1/2 inch brake lines were driven into the subgrade using a hammer drill, to the correct depth. 60 litres of cement grout were injected into the drilled holes through the brake lines, permeating into the loose fill, binding with the fill to form a cement stabilized base.

Cement grout injection using Multiurethanes Microfine Cement and Superplasticizer, 1/2 inch Brake Lines, four chemical pumps, and a CG Mixer 22E were used to stabilize the backfill along the perimeter of the open trench. The stabilization program eliminated the potential for collapse of the open trench, allowing for the utility contractor to continue the excavation operation without incident.

Equipment Customization for Cement Grouting

Equipment Customization for Cement Grouting

Location: Mount Pleasant, NY
Sector: Utilities
Category: Cement Grouting, Chemical Grouting

Description

A municipal water supply organization was constructing a large water treatment facility situated on the outskirts of New York City. Construction crews encountered a leaking bypass pipe at a depth of 400 feet below the surface between two adjacent deep water supply shafts.

Multiurethanes grouting specialists supported decommissioning operations undertaken by a deep dive contractor to fill the defective bypass pipe using cement grout.  In addition, they prepared customized electrical equipment for this underwater grouting project, including a diesel generator and an electrical control panel with variable frequency drives to operate colloidal mixer, agitator tanks, and progressive cavity pumps.

fill stabilization around underground chamber

Fill stabilization around a manhole

Location: Toronto, ON
Sector: Utilities
Category: Chemical Grouting, Crack Injection

Description

Loose fill surrounding a manhole structure required stabilization. Multiurethanes technicians injected Universal Resin through vertical injection pipes to stabilize the fill prior to cutting through the structure wall.