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Secant Wall Piling

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Secant Wall Piling

Secant walls are formed by constructing overlapping reinforced concrete piles to create a continuous retaining and groundwater cut-off wall.

Typical Applications

Deep basements
Underground structures
Water-retaining excavations
Urban construction

Advantages

Excellent groundwater control
High structural stiffness
Suitable for deep excavations
Low vibration installation

Limitations

Higher construction cost
Complex sequencing
Tight tolerance requirements

Typical Execution Sequence

Set out primary pile locations
Drill and cast primary (female) piles
Allow initial curing
Drill secondary (male) piles overlapping primaries
Install reinforcement cages in secondary piles
Cast secondary piles
Excavate in stages
Install internal support systems

Quality Control

Overlap tolerance checks
Concrete testing
Verticality monitoring
Wall continuity verification

Subject To

Detailed temporary and permanent works design
Groundwater analysis
Precision surveying