Diaphragm Wall Construction for the proposed residential development at 330 Church Street, Parramatta, NSW. The proposed development will comprise two residential towers over a...
Diameter ranges from 90mm to 400mm.
Avopiling utilises its Soilmec SM405 drilling rig to install anchors.
The same equipment is also utilised for large dia. bored piles. Avopiling have on a number of occasions used DTHH method to create pre bores in extremely high strength rock for a large dia. bored pile. This increases efficiency through rock sockets and also creates the opportunity to use a smaller rig when platform space is of concern.
- Small footprint of machinery.
- Efficient drilling method utilised via DTHH applications.
- Used in conjunction with large dia. piles to increase efficiency in high strength rock socket drilling.
Diaphragm Wall Construction for the proposed residential development at 330 Church Street, Parramatta, NSW. The proposed development will comprise two residential towers over a common podium level and four levels of basement carparking over the main rectangular portion of the site with the footprint of the basement extending to the eastern, western and southern boundaries, and set back between about 9m and 12m from the northern site boundary. The site is located within near level terrain on the south bank of the Parramatta River. Bulk excavations to a maximum depth of about 12m below existing surface levels to be carried out following the completion of the Diaphragm wall.
The work was carried out for Karimbla Construction Services Pty Ltd (Meriton Group)
Scope of Works
Design and construction of the diaphragm wall system with two rows of temporary rock anchors through the wall, which include:
Diaphragm wall: 49 panels x 640mm wide x 2800mm-7000mm length x 12m–13m depth
Temporary anchors: 2 rows x 243 rock anchors x approx. 14m-23m length
- Design works for the diaphragm wall.
- Removal of 40 existing old reinforced concrete piles from the location of the diaphragm wall.
- Design and construct Guide Wall.
- Supply and installation of all concrete, reinforcing steel, anchor blockouts and couplers.
- Supply and installation of Inclinometer system.
- Design, install and test all anchors.
- Installation of standpipe piezometers and monitoring of groundwater levels.
- Monitoring the performance of the southern boundary shoring using the inclinometers and survey monitoring points.
- De stress the temporary anchors.
Concrete used: 50MPa for DW panels (volume 2,650m3)
25MPa for Guide Wall (volume 370m3)
Reinforcement: 200 ton
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.
Scope of Works
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.
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....