Soldier piles and lagging

Secant Wall

When excavating in close proximity to an existing structure, or when excavation is close to the water table, a secant wall is usually required. Secant walls may be preferable to soldier piles and lagging when minor losses of soil, during lagging operations, might be detrimental to adjacent footings.

These walls can be used to restrict water from entering the excavation. Secant walls are more common in urban areas than sheet piling as the piles are drilled and not vibrated into place, allowing them to be more readily installed close to adjacent buildings.

Sheet Piling

Sheet piles are interlocking steel sheets typically driven into the ground with a vibratory pile driver. They are designed for work close to or within the water table. The interlocking sheets form a continuous barrier that permits excavation below the water table. The vibratory installation of sheet piles can significantly effect nearby structures and therefore is not commonly used in urban areas. Stable Ground has the expertise and equipment for more limited sheet piling projects in Toronto.

Caissons/drilled shafts

A drilled shaft filled with concrete is known as a caisson. The diameter of these shafts range in size from 16”- 48’’. The hole is drilled to a suitable bearing stratum or is drilled to a depth where there is sufficient friction to the sides of the hole. The bottom of the shaft must be pristine, prior to concrete pouring to avoid future settlement concerns. Caissons may be reinforced or unreinforced, depending on load conditions.

Stable Ground has the equipment, tooling and experience to install straight shaft caissons in both cohesive and noncohesive soils, and angled/belled caissons in cohesive soils.