Jet grouting is a soil improvement technique that employs high-speed fluid jets to erode a soil.
Diameters range from 600mm to 2500mm.
Jet grouting is a soil improvement technique that employs high-speed fluid jets to erode a soil. The resulting cavity is then filled with grout to form a composite soil/grout material that enhances the overall properties of the soil.
Ground modification/improvement of a soil by jet grouting plays an important role in the fields of foundation stability, particularly in the treatment of load bearing soils under new and existing buildings. Jet grouting should be considered in any situation where the control of underground fluids or excavation of unstable soils is required.
Jet Grouting installs fluid grouts, (air and water if necessary) at high internally controlled pressures, varying from 30 to 50 mpa (4,300 to 7,200 psi) and relies on high nozzle velocities to achieve the required diameters. As such it has proven popular for both ground improvement and in particular underpinning of existing footings on poor ground conditions.
Diaphragm Wall construction for Stage 4 (Project 145) for a fourth Dump Station and associated conveyor infrastructure at the Port Waratah Coal Services (PWCS) Kooragang Coal Terminal (KCT).
The work was carried out for Bechtel on behalf of PWCS.
The project included the following relevant elements:
A conveyor exits the base of the dump station through a tunnel which slopes up to a surface exit point about 200 m to the east and was constructed using a similar methodology to the main dump station.
All construction associated with the diaphragm wall system and supporting base plugs (jet Grouting Plug) between the walls for both the dump station and the tunnel.
Dump Station area was divided by cross DW panels into 3 cells. Tunnel area was divided by (Jet Grouting) cross cut-off walls into 4 equal cells.
Dump Station
No. of Cells: 3
No. of Diaphragm Wall Panels: 25
Size of Panels: 11nos.x800mm wide x (2800mm-7000mm) length x 20m-28m depth.
24nos.x640mm wide x (2800mm-7000mm) length x 14m-21m depth.
Tunnel
No. of Cells: 4
No. of Diaphragm Wall Panels: 48
Size of Panels: 48nos.x640mm wide x (2800mm-7000mm) length x 11.3m-17m depth.
Works include:
Concrete used: 40MPa for DW panels (volume 4,673.8m3)
25MPa for Guide Wall (volume 476.2m3)
Reinforcement: 522.75 ton
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
Diaphragm Wall construction for Stage 4 (Project 145) for a fourth Dump Station and associated conveyor infrastructure at the Port Waratah Coal Services (PWCS) Kooragang Coal...
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...
