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 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.

 

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.

soil stabilization Billy Bishop airport

Soil Stabilization Program using Sodium Silicate

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

Description

Loose sand presented a risk of surface voids forming during a directional drilling project beneath an active airport apron. Multiurethanes engineers designed a grouting solution using sodium silicate, delivered through sleeve pipes, to stabilize soils in the high-risk area during directional drilling.

Water cutoff in a sewer rehabilitation project

Leak Sealing in Sewer Rehabilitation Project

Location: Markham, ON
Sector: Utilities
Category: Cement Grouting, Water Cut-off

Description

We provided a specialized water cut-off solution for a municipal sewer maintenance project. The project required grouting from surface to repair leaks in a large diameter sewer pipe.

Our solution involved pumping a fast-curing cement plus sodium silicate grout mixture delivered through vertical injection pipes installed around the sewer.

This work required a customized grout plant with multiple pumps and flow meters.