Underground Division

From complex tunnel and foundation construction to utility installations, our expert team completes projects on time and on budget.

Bronte Construction offers exceptional engineering services. We are able to facilitate complex project implementation, from design to construction, for results which will enhance our communities for generations.

View our underground project portfolio below.

Excavation Shoring Services

Integral in every underground construction project, particularly in locations below the water line, is the process of shoring. Our skilled team will facilitate a custom solution that fits the needs of your specific project.

Secant/Caisson Walls

Secant or caisson walls are created by constructing intersecting concrete piles, which are then reinforced with steel rebar or beams. This shoring option is more expensive than other walls, but will ensure less movement than the alternatives.

Sheet Pile Walls

Sheet pile walls are constructed by driving prefabricated metal sheets into the ground. This lightweight option is economical and useful for construction below the water line.

Soil Nail Walls

Soil nail walls are constructed by inserted stabilizing steel bars in closely spaced, pre-drilled holes, which are then secured in place with grout or shotcrete. Soil nailing is a great option for restricted spaces or locations with obstructions.

Soldier Piles & Lagging Walls

Soldier piles and lagging walls use vertical steel piles with horizontal timber lagging to hold back soil. Piles are drilled, or driven, into the ground at regular intervals and the timber lagging is placed between them. Soldier Piles and Lagging Walls offer fast construction and are versatile, but are not suited to locations with high water table conditions without significant dewatering.

Tieback Anchors

Tieback anchors are used to reinforce and stabilize other shoring systems, such as sheet piles or secant walls. Anchors are inserted into the wall to improve lateral resistance and reduce lean, as with seawalls.

Pile Foundations

Pile foundations are created in order to transfer significant loads into the stronger soil or bedrock in an underground construction project. Our skilled team will implement the techniques that best fit the needs of your specific project.

Drilled Piles/Caissons

Drilled piles, caissons, or cast-in-place piles are constructed by drilling a hole and then placing concrete directly into it. These piles are often reinforced by casing. This is recommended for larger builds where there are very large loads.

Continuous Flight Auger (CFA) Piles

A continuous flight auger (CFA) pile or auger cast pile is constructed by drilling a hole with a hollow-stemmed auger or drill bit. A concrete, or grout mix, is then pumped down the stem of the auger and the auger is slowly removed, replacing soil with the mixture. This is ideal for soft ground and can be used to transfer loads underneath structures.

Driven Piles

Driven piles are prefabricated piles that are driven into the ground using a pile driver. They are often constructed from wood, reinforced concrete, or sheet metal. They offer a quick and inexpensive way to provide pile foundations.

Helical/Screw Piles

Helical or screw piles are round metal piles with helical screws on the leading end. They are drilled in the ground, like a screw, using heavy machinery. They are versatile and do not contribute to soil displacement.

Micropiles

Micropiles, or mini piles, are often used for creating foundations at sites with restricted access. They are typically between 60 and 300 mm in diameter, are constructed from steel, and may be reinforced with grout. They are quite durable and are best suited in areas with difficult soil makeup.

Underground Division Construction Projects

Sherman Access

Location: Hamilton, Ontario Project Value: $3,420,000.00 Owner: City of Hamilton Consultant: CoH Bronte Construction was hired by the City of Hamilton to complete a series of repairs to the [...]