water cut-off in hard rock tunnel

Innovative Water Cut Off Solution for a Hard Rock Tunnel

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

Description

A large tunneling contractor found itself in a difficult situation with a large flowing water leak in a new rock tunnel 20 metres underground. During tunnel construction, localized areas of bad ground conditions were encountered, characterized by heavily fractured rock.

Conventional cement grouting was used by the tunneling contractor to control water inflows in some of these areas. An evaluation of the particular site conditions by the Multiurethanes crew determined that debris and broken ground made it impossible to accurately identify the primary water-bearing fracture as experienced by the tunneling crew when initial injections were washed out by the large water inflow.

An innovative solution involving chemical grouting through single grout hole injection while isolating and identifying nearby localized leaks was successfully implemented. The specialized nature of the water cut-off grouting work required a combination of materials, equipment and experience, including Multiurethanes Universal Resin, a pneumatic chemical pump and skilled grouting techniques performed by our experienced grouting specialists.

The secret to this successful water cut-off project was the application of appropriate grouting techniques, equipment and materials for the existing site conditions.

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.

 

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.

 

 

leak sealing in underground chamber

Leak Sealing in an Underground Chamber

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

Description

A utility contractor needed a permanent solution to fix an underground chamber that was prone to repeated flooding through leaking pipe penetrations.

Multiurethanes’ technicians used chemical grout to fill the annular space around the pipe penetration and fix the source of the water inflows.

Chemical injection to repair construction joints

Chemical injection to Repair Construction Joints

Location: Russel, MB
Sector: Heavy Civil
Category: Chemical Grouting

Description

A general contractor in western Manitoba required grouting expertise to stabilize an extra-large construction joint (250 m long) on a dam rehabilitation project. The concrete had started to deteriorate, creating small voids in the joint.

We provided technical support to repair the joint using Multiurethanes Universal resin to prevent water from entering and causing further damage.

The chemical grout filled the voids, stabilized the joint and provided protection against water penetration.

Void Filling in Tunnel Liner at Eglinton Crosstown Project

Cement Grouting to Fill Voids Behind a Tunnel Liner

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

Description

We provided soil stabilization services at the Eglinton Crosstown Project in Midtown Toronto.

The scope of work involved injecting cement grout around the tunnel liner to fill voids. Our solution involved a microfine cement grout mixture delivered through vertical injection pipes installed around the tunnel.

Microfine cement is able to penetrate very small openings such as soil pores and microscopic rock fissures, in order to improve strength and reduce permeability.

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.

cellular grouting for void filling annular space

Cellular Grouting for Void Filling Annular Space

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

Description

Our skilled technicians assisted a utility contractor with a cellular grouting operation to backfill underground casings, as part of the project to upgrade the Toronto’s electrical system. A mix of cement slurry and foaming agent was successfully used to fill the annular space along the pipes in the electrical installation.

cellular grouting infrastructure project

Cellular Grouting for Infrastructure Project

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

Description

Assisted an infrastructure contractor with a cellular grouting operation to backfill relined culverts along Highway 407. A mix of cement slurry and foam agent was successfully placed using low-pressure grouting techniques to fill the annular space along the pipe.

Diaphragm pumps, static mixer, foam generator pump, chemical grout pumps were part of the equipment used to complete this operation.