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.

Grouting Tunnel Cross passage

Cement Grouting to Fill Voids in Tunnel Cross Passage

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

Description

A public transportation agency encountered water infiltration into the subway system, due to voids behind the cross passage section of the tunnel.

Working within the cross passage segment of the tunnel, 15 investigative holes were drilled to identify the location of the voids which contained water. Mechanical packers with ball valve assembly were then installed into the drilled holes where the presence of water inflow was observed. Cement grout was continuously injected into the drilled holes via the mechanical packers until grout was detected resurfacing from an adjacent open valve. The resurfacing of grout indicated that the cavity had been filled, as the water had been displaced away from the cross passage section.

Cement grout injection using Multiurethanes Microfine Cement, mechanical packers and a chemical grout pump were used to fill the voids behind the cross passage section. The method eliminated the infiltration of water into the tunnel and allowed utility contractors to work safely within the cross passage.

Crack injection in underground parking garage

Chemical Injection in Underground Parking Garage

Location: Burlington, ON
Sector: Infrastructure
Category: Chemical Grouting

Description

A building and garage restoration contractor observed extensive cracks in the concrete and water infiltration through the foundation walls.

Working within the underground parking garage, 3/8 inch diameter holes, every 8 inches at a depth of 10 inches were drilled. Alternating holes were drilled on each side of the crack, at a 60 degree angle to intersect the crack at the mid-point of the foundation wall. Plastic packers were then installed into the drilled holes, and flushed with water/acid solution to rid debris from the holes and the crack itself.

Chemical grout was then injected into the drilled holes filling the fine cracks and forming a flexible foam barrier, sealing the crack, preventing further water discharge.

Chemical grout injection using Multiurethanes Flexible Resin and Flexible Accelerator, Multiurethanes Crack Flushing Agent, 3/8″ plastic packers and two chemical grout pumps were used to seal the cracks in the foundation wall.

The application eliminated the continued water seepage into the garage, allowing for the parking garage to be returned to service.

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.

Chemical Injection in Mechanical Room

Chemical Injection in Mechanical Room

Location: Toronto, ON
Sector: Residencial
Category: Chemical Grouting

Description

A building restoration contractor experienced water leakage into the mechanical room from 2” diameter holes which contained glycol lines running through them, to melt snow on a vehicle ramp.

Working within the mechanical room, 5/16” break lines were placed at a depth of 8” into the holes. These holes were then sealed with hydraulic cement, and when cured water was then introduced through the brake lines into the holes. Polyurethane resin was then injected into the holes, filling the holes and forming a semi-rigid foam barrier, preventing further water leakage.

Chemical grout injection using Universal Resin, Universal Accelerator, 5/16” brake lines, and two grout injection pumps were used to fill the holes in the wall. The technique eliminated further water leakage into the mechanical room.