Bored Piles are non-displacement piles capable of carrying large vertical loads and are particularly efficient and cost effective when boring into cohesive soils.
Pile diameters range from 300 mm to 3.0 m.
Pile lengths to a depth of 90m.
Rig weights range from 11t to 180t.
Bored Piles offer larger diameter piles than any other piling method and permit pile construction through particularly hard strata. Where unstable strata is encountered temporary or segmental casing and permanent steel liners, bentonite slurry or polymers may be used for bored piling.
Bored Piling is a popular foundation system for bridges and tall buildings. It is also applicable to retaining walls, secant, contiguous and soldier pile walls.
Bored piling is a progressive system of drilling and withdrawing the auger until the desired depth of pile is reached. In most cases excavated material is being verified and the pile base is cleaned before placing the reinforcement steel and pouring the concrete.
In order to service the new Perth Football Stadium, Belmont Park Station on the Perth to Armadale railway line is being expanded to provide dedicated platforms for event goers. This involves increasing the number of railway lines that pass through the station from two to six. In order to do this, the bridge that carries Victoria Park Drive above the station has to be expanded to accommodate the additional tracks. In addition, a pedestrian underpass is being constructed beneath Victoria Park Drive to provide access to the stadium from the station.
Avopiling was required to install a total of 247 piles forming five contiguous pile retaining walls for the new bridge abutments. In addition a further 11 piles were installed beneath load bearing piers. Pile diameters varied from 600mm to 900mm and they were installed to various depths, some exceeding 35m.
Temporary casing was vibrated through the fill materials from which the existing bridge approach embankments had been constructed. Beneath the engineered fill forming the embankment lay uncontrolled fill comprising medium to high plasticity sandy clay interbedded with layers of sand. High plasticity clayey silt known as Swan River Alluvium lay beneath the fill materials, which in turn was underlain by medium dense silty sand. The deeper piles were founded in very dense Kings Park Formation sand.
To support the pile bore in the deeper natural materials, Avopiling used a polymeric drilling fluid.
All this took place in a very confined site with live traffic running alongside the piling works and passenger trains passing beneath the existing bridge. Close collaboration with Lend Lease ensured that traffic switches between the westbound and eastbound carriageways took place with minimum disruption and maximum efficiency to the piling operations. To meet the programme constraints of the northernmost part of the bridge expansion Avopiling worked seven days per week to ensure that Lend Lease was able to meet its contractual obligations.
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.
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
Located at the heart of Brisbane’s exclusive riverfront setting and the Central Business District (CBD), this iconic and modern building is centrally located with a wide range of amenities and services, both within the building and close by as well as being on the door step of the well established Riverside Precinct.
Design and construction of Diaphragm wall (83m of guide wall and 1200m3 of diaphragm wall) total number of 27 panels 640mm x 2800mm, the max excavation depth 24m. Up to 10m of rock cutting, in excess of 220Mpa.
In order to service the new Perth Football Stadium, Belmont Park Station on the Perth to Armadale railway line is being expanded to provide dedicated platforms for event goers....
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...
Located at the heart of Brisbane’s exclusive riverfront setting and the Central Business District (CBD), this iconic and modern building is centrally located with a wide...
