Rock solid.

Slide 1

Secant Pile Walls

Secant piled walls are embedded retaining wall structures mainly utilised to allow deep excavation in water charged ground conditions.

Using CFA – Diameters from 450mm to 1200mm.

Using Bored Piles with segmental casing- Diameters from 450mm to 1500mm.

Using  Turbo Jet  - Diameters from 600mm to 1200mm.

Applications

Secant piled walls are embedded retaining wall structures mainly utilised to allow deep excavation in water charged ground conditions. The walls are constructed by installing piles in a predetermined sequence. Soft (normally un-reinforced) piles are installed first followed by hard (reinforced) piles which overlap, cutting into the two soft piles on either side. Once the wall is complete the end product is a ground and water retaining wall that can also be load bearing. 

This design is also suitable for retaining fine sands and very soft wet ground and may be used for cut-off walls such as cofferdams. The purpose of the secant piled wall is  to ensure that the ground or composition behind the wall is securely and safely held in place despite its lateral and downward pressure against the retaining  structure.

Secant pile walls can be constructed using different piling methods such as CFA, Bored Pile, Cased Secant Pile (CSP) or turbo jet (soil mixing).  

Advantages

  • Minimal ground disturbance to adjacent property.
  • Low noise and vibration.
  • Excavations kept sufficiently dry that dewatering is not essential.
  • Can be incorporated into permanent works to form part of the structural foundations.
  • Can be used as a temporary structure.

8 Oaks Avenue Dee Why

  • LRB255-02 in Cased CFA mode
  • LRB255-02 connected to a Schwing concrete pump.

Project Outline

The project is a mixed use building development with 4 basement parkings being built by Atlen Constructions Pty Ltd

Scope of Works

Avopiling was contracted to design and build the shoring wall and the foundation piles. The secant wall shall consist of 750Ø Cased CFA Piles 65No primary (Hard piles) and 66No secondary (Soft Piles) to depths averaging 18.00 meters deep. The 750Ø foundation bored piles are to be built using segmental casings to pile depths to 25.00 meters deep.

Cadia East Raisebore

  • Liebherr driiling rig LB45-02
  • Bauer drilling rig BG45-01

Project Outline

Redpath Contract Services Pty Ltd provides mine development services and tunneling.

Scope of Works

Avopiling Australia was contracted to construct bored pile secant pile wall for two shafts using segmental casings. Each shafts consists of 26No - 1000mmØ bored piles 21.00 meters to 24.00 meters deep .

Project examples

8 Oaks Avenue Dee Why

8 Oaks Avenue Dee Why

NSW
The project is a mixed use building development with 4 basement parkings being built by Atlen Constructions Pty Ltd

Project examples

Cadia East Raisebore

Cadia East Raisebore

NSW
Redpath Contract Services Pty Ltd provides mine development services and tunneling.

Project examples

Perth City Link, Perth, WA.

Perth City Link, Perth, WA.

WA

Perth City Link, formerly known as the Northbridge Link, is a collaborative project funded by three tiers of Government and led by Metropolitan Redevelopment Authority and the...

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