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.

Soil stabilization for tunnel construction project

Soil Stabilization in Tunnel Construction Project

Location: Toronto, ON
Sector: Tunnels
Category: Soil Stabilization, Water Cut-off

Description

Multiurethanes provided soil stabilization for a complex tunnel project with several site restrictions including no drilling from surface and working in close proximity to sewer and water mains. Our solution involved sodium silicate grouting delivered through horizontal injection pipes arrayed out from inside a shaft. Injection of Universal Resin was also performed in localized areas. We specialize in projects with technical, complex grouting requirements.

Pressure grouting for railway repairs

Pressure Grouting for Railway Repair

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

Description

Our technical team developed a solution to lift train track crossings on wood ties by pressure grouting under the tracks. This new approach was fast, reliable and surprised the utility contractor, who had been looking for this solution for a long time. Multiurethanes technicians bring practical product knowledge and hands-on experience for applying proven grouting techniques to new applications.

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.

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.