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.

Soil Stabilization for Utility Contractor

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.

Epoxy injection on canal wall

Epoxy Injection in Canal Wall

Location: Port Colborne, ON
Sector: Industrial
Category: Chemical Grouting, Cement Grouting

Description

A restoration contractor refurbishing the canal and lock gates found a 3/8” x 40’ joint within the canal wall which needed to be sealed from infiltration of water.

Work commenced from within the trench and above the wall, where 3/8” holes were drilled into the canal wall. 80 holes were drilled in a staggered pattern atop the wall, holes were drilled every 12” straight down into the joint at a depth of 18”, and holes were drilled every 6” at a 60-degree angle to intersect the joint towards the face of the wall at a depth of 21”. 3/8” plastic packers were placed into the drilled holes and the 40’ joint was then pargeted with hydraulic cement to ensure the limited loss of injected material.

The injection process took place in 2 stages; the first stage of the injection began with the injection of epoxy into the holes which were spaced every 6” and drilled at a 60-degree angle towards the face of the canal wall, to ensure the limited loss of injected material. The epoxy cured sealing the joint towards the canal, and the hydraulic cement cured sealing the joint towards the trench, with the expectations of inclosing the epoxy for the second stage of injection. The second stage of injection then took place by injecting into the holes which were drilled every 12”, straight down into the joint at a depth of 18”. The joint was filled with epoxy, forming a rigid barrier, preventing the infiltration of water into the canal wall.

Chemical grout injection using epoxy resin (part A and B), 3/8” plastic packers, and a chemical grout pump were used to seal the joint in the canal wall. The application eliminated the possibility of future water infiltration into the canal wall.

cement grouting for LRT tunnel construction

Cement Grouting in LRT Construction Project

Location: Toronto, ON
Sector: Infrastructure
Category: Cement Grouting, Soil Stabilization

Description

Performed microfine cement grouting and water-stop operations using polyurethane resins, and provided soil stabilization in cross passage tunnels along the road in a light rail transit (LRT) line construction project.

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.

cellular grouting operation in Downtown TO

Cellular Grouting to Backfill Underground Casings

Location: Toronto, ON
Sector: Infrastructure
Category: Cellular Grouting

Description

A project to improve the electrical system in Toronto’s downtown core is currently undergoing and involves the construction of new cable chambers and concrete encased duct banks.

The contractor required a grouting solution to backfill underground casings and control ground water migration into the excavation site, adjacent to Lake Ontario’s shoreline.

Our experienced grouting specialists designed and successfully executed a cellular grouting program, using a mix of cement and foaming agent, suitable for this particular type of application and site conditions.