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
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
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
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 .
Perth City Link, Perth, WA.
Project Outline
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 Public Transport Authority (PTA).
The PTA’s $609 million ($360 million Rail and $249 million Bus stage) transport infrastructure work at and around Perth Station is the catalyst to bring Perth City Link's vision to life.
Scope of Works
Installation of 288 No. 2800mm x 1200mm rectangular Cutter Soil Mixing panels up to 9m in depth
Installation of Stage 1 during 2012 of 81 No. 1050mm & 1200mm diameter Bored Piles up to 47m in depth utilising a temporary casing system with the combination of polymer and bentonite as drilling fluid. The piles included socketing of up to 12m in the Kings Park Formation rock. Stage 2 to commence in 2013, includes 62 No. 1050mm & 1200mm diameter piles up to 45m in depth.
Installation of 330 No. of 750mm & 600mm diameter Continuous Flight Auger (CFA) Secant Pile Wall up to 16m in depth for the Pedestrian Underpass
Installation of 100 No. 450mm diameter CFA Secant Pile Wall up to 11m in depth for temporary excavation works in front of the Horse Shoe Bridge
Installation of 100 No. 750mm & 900mm diameter CFA Contiguous Wall Piles for Barrack Street East/West & The Child Care Centre
Installation of 132 No 700mm & 1200mm diameter up to 10.5m deep Jet Grouting Columns
Project examples
Project examples
Cadia East Raisebore
NSW
Redpath Contract Services Pty Ltd provides mine development services and tunneling.
Project examples
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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