what is drilled piers foundation & construction of Drilled piers

 

what is drilled piers foundation & construction of Drilled piers 

Drilled Piers

Drilled piers, also known as drilled shafts or caissons, are deep foundation systems formed by excavating a cylindrical hole and filling it with reinforced concrete, used to transfer loads from unstable soil to deeper, stable ground.

Here's a more detailed explanation:

What they are:

Drilled piers are a type of deep foundation solution that involves drilling a hole into the ground, placing reinforcing steel, and then pouring concrete to form a strong, vertical pier.

How they work:

They transfer the structural load from the upper, potentially unstable soil layers to a deeper, more stable soil or bedrock layer.

When they are used:

Unstable soil: They are particularly useful when the soil at the surface is weak or unstable, such as in areas with expansive soils or where there's a high risk of erosion.

Heavy loads: They are well-suited for supporting heavy structures, bridges, and other infrastructure projects.

Lateral loads: They can also resist lateral loads or forces, making them a good choice for areas where there are horizontal forces against the foundation.

Types of drilled piers:

Straight-shaft piers: These have a cylindrical shape without an enlarged base.

Belled piers: These have an enlarged base (or "bell") at the bottom, which helps to increase the bearing capacity and resistance to uplift.

Construction process:

A hole is drilled into the ground using a drilling rig.

Reinforcing steel (rebar) is placed in the hole.

Concrete is poured into the hole to fill it and form the pier.

Other names:

Drilled piers are also sometimes referred to as drilled shafts, caissons, bored piles, or cast-in-drilled-hole piles.