How does secant piling work?

How does secant piling work?

A Secant Piled Wall is a retaining wall constructed for ground retention prior to excavation. The wall is formed by constructing alternating primary (female) and secondary (male) piles where the secondary piles partially cut into either side of the primary piles in order to form a continuous impervious structure.

What is a secant pile?

Secant pile walls are created by drilling or augering a series of overlapping concrete piles reinforced with steel beams or rebar to form a wall. After the initial piles are installed and gain sufficient strength, the secondary piles are installed in between the initial piles to create a continuous and impervious wall.

When would you use secant piles?

Secant Pile Walls are usually installed as retaining structures and support systems for deep foundations, retaining elements and at the same time load-bearing walls and deep foundations for engineering constructions (e.g. walls and foundations of underground storeys, stand-alone and framed bridgeheads, etc.).

Are secant piles permanent?

Secant pile walls consist of reinforced and non-reinforced piles. The reinforced piles are then installed and the reinforcement can be either cages or I-beams. When deflection criteria is tight, secant pile walls can be retained by anchors or strutting systems either as temporary or permanent retention.

Are secant piles waterproof?

Secant walls are designed to be water resistant. Secant pile walls are usually installed as retaining structures and support systems for deep foundations, retaining elements and at the same time load-bearing walls for engineering constructions.

How is piling used for deep excavation sites?

Piling is the process of strengthening the deep foundation underneath your project. Piling transfers materials down to a deeper level than standard shallow foundation, as a result making the surface structure more secure.

What is the difference between contiguous piles and secant piles?

Concrete @ your Fingertips The piles may be constructed so that they virtually touch each other (contiguous). The gaps between the piles can be grouted to form a watertight retaining wall. Alternatively (secant piles) every other pile may be constructed, with their centres less than two diameters apart.

How many piles are required to support a column?

At least three capped piles are needed to ensure stability against lateral forces (with the exception of caisson piles). Capping beams are also suitable for distributing the weight of a load-bearing wall, or of close-centred columns to a line of piles.