cement grouting to stabilize retaining toll

Emergency Cement Grouting Operation to Stabilize a Retaining Wall

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

Description

The City of Toronto required Multiurethanes‘ technical expertise for an emergency cement grouting project to stabilize an undermined retaining wall over a 50 m length.

One of the biggest challenges was accessing the work area through heavy bush over a small muddy path. Once there, our grouting technicians drilled steel grout pipes into the bottom of the retaining wall. The grouting equipment was transported to the site by using a loader and consisted of a portable grout mixing and pumping unit with ancillary water supply.

This emergency project was completed within four days and required 500 bags of high-performance non-shrink grout. A solid foundation was created to permanently stabilize the retaining wall and adjacent embankment.

 

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.

Soil stabilization in high-rise development construction

Soil Stabilization for High-rise Development Construction

Location: Toronto, ON
Sector: Residencial
Category: Soil Stabilization

Description

While working on site at a Toronto Lakeshore high-rise development adjacent to Lake Ontario, Multiurethanes encountered a challenging situation performing water abatement and soil stabilization for the required high-rise foundation construction. With frigid January temperatures, the soil on one side of the wall became too unstable to work around. The site superintendents decided to halt all construction work while Multiurethanes stabilized the soil and stopped the flow of water.

Our grouting specialists faced with the challenge of securing the worksite to achieve these goals. Our team developed an innovative and unique solution; consisting of attaching a metal plate between perpendicular supports to strengthen the cracked wall, drilling grout equipment access holes in the metal plate, and performing cement grouting injections.

This solution proved to be very successful and our client was extremely impressed with our team’s innovation and quick thinking to de-escalate an unsafe work environment, as well as the completion of our assigned tasks. They have since asked us to perform this same solution technique to other challenging projects.

 

Chemical grouting for masonry restoration

Chemical Grouting for Masonry Restoration

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

Description

Voids within a century old church tower required a low-density fill to prevent water infiltration from migrating within the masonry structure. Multiurethanes technical team safely filled the existing voids using durable chemical grout materials.

 

 

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.

Void Filling under Factory Facility

Location: Guelph, ON
Sector: Industrial
Category: Cement Grouting

Description

Multiurethanes’ technical crew supported a cement grouting program required to fill underground voids encountered under a factory facility.

A mix of non-shrink grout and water was pumped into 1 1/2’’ holes drilled into the void until the grout started flowing from the holes. This evidence and the use of a pressure gauge determined that the voids were successfully filled.

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.

consolidation grouting for construction of a tailings dam

Consolidation Grouting in a Tailings Dam

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

Description

A large mining company required upgrades to an existing tailings storage facility to comply with current regulatory standards. The general contractor undertaking the required upgrades retained the services of Multiurethanes to supply cement grouting equipment and experienced grouting specialists for consolidation grouting of fractured rock beneath the alignment of the new tailings dam.

The grout curtain consisted of three rows of holes, drilled to a nominal depth of 10 m. Cement grouting equipment consisted of inflatable borehole packers, electromagnetic flowmeters, progressive cavity pumps, and paddle grout mixers.

Cement grouting for Bridge Rehabilitation

Cement Grouting for Bridge Rehabilitation

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

Description

Our technical staff worked with a heavy civil contractor on an important rehabilitation project performing a variety of cement grouting work to replace the rail bridge that crosses Lansdowne Ave, south of Dundas Street West in Toronto.

A section of the bridge was removed on Friday night and the new section had to be installed and operational by Monday morning. Due to the urgent nature of the work, our grouting specialists used a fast setting grout to fill voids beneath pre-cast concrete sections and grouted anchors to hold the bridge structure.

Our portion of the grouting proceeded very well even though the weather conditions (rain and snow) were less than ideal for grouting work. All of the cement grouting operation was completed on schedule, with satisfactory results.