Residential Basement

10 meters.

Yes, that was the entire site width for this project. Surrounded by luxury homes, in a busy Gold Coast beachside street.

The project, 44L/M Contiguous Pile Walls for a single level residential basement was definitely a tight squeeze, but still executed brilliantly by our skilled team.

Midnight Apartments Braddon

ASP Piling NSW has been engaged by Geocon to carry out the design and construct of the retention system for Midnight Apartments, Braddon. The development consists of a 9-storey residential development, with three levels of underground basement car parking.

An anchored soldier piling solution was used on this project due to the ground conditions found in the geotechnical investigations. The stiff clay overlying weathered rock combined with the site being surrounded by roadways on three sides and a neighbouring 9-storey residential building with two levels of underground basement carparking made soldier piles the most effective option.

The soldier pile system for the project used 600mm diameter reinforced concrete piles. ASP Pilng NSW has installed approximately 320 lineal metres of soldier piles around the perimeter of the site. Once a suitable depth of excavation, shotcrete infill panels are constructed between the soldiers to prevent loss of soils between soldiers. Once excavation achieves the first row of anchor levels the ground anchors are installed. Location and orientation of the anchors are chosen to avoid any underground obstructions such as services or underground structures.

Once the ground anchors are properly installed excavation proceeded with subsequent geotechnical inspections, shotcrete and anchoring works carried out. This process will occur until final excavation is reached.

The ground anchors for this project are temporary in nature. Once the basement slabs are propping the soldier piles the anchors will be redundant and can be destressed. The maximum excavation depth on the site is 10 metres.

Cosmopolitan Cotton Tree

ASP Piling was contracted by Construction Control for the piling and dewatering of The Cosmopolitan in Cottontree at Maroochydore. The large parkland and waterfront site has a basement footprint that spreads two street frontages and adjoins the two towers being built. A total of 143 apartments will be spread over the two seven-storey residential towers.

We provided a range of options to our clients based on engineering, cost and site requirements and constraints. A combination of piling options was employed for the retention and foundation solutions, along with Australian Dewatering Systems site dewatering and environmental services.

The secant piling option was used for the section of basement perimeter with a 6-storey commercial building abutting the ‘Cosmopolitan’s’ boundary. Approximately 10-metre deep scant piles were installed with temporary anchoring. Sheet piling options were used for the remainder, a variety of depths and profiles being used based on basement requirements with the two towers having different basement depths. The sheet piles ranged from 6 metre sheets to over 10 metres long with the associated anchoring and removable whalers were used.

Foundation Piles were installed by ASP Foundation Piling across the site and for the crane base. Over 200 CFA piles were installed with our SF65 Soilmec piling rig.

Australian dewatering systems installed a perimeter spear system around the boundary of the site. The dewatering was installed and commissioned in a staged process as the site was excavated. A deep well system was installed to ensure the system would cope with the dewatering requirements as the basement level was excavated below the natural water table depth. In addition to the dewatering equipment, a filtration unit and sedimentation tank were needed and based on electricity availability a fuel cell and generator for a short period. Further, into the project, an Iron Remediation Tank was needed according to the levels indicated in the monitored discharge water. As always, the site had a dewatering management plan in place and compliance monitoring throughout the discharge process.

Mercato Byron Bay

‘Mercato’ in Byron Bay is leading the way in the area for environmentally friendly commercial space, looking to have a five-star green star rating for the retail and dining precinct. Azzura Corporation engaged Hutchinson Builders for the construction of Mercato in Byron Bay. ASP Piling was contracted to install the retention walls and foundation piling for the basement, and Australian Dewatering Systems for the dewatering of the project.

ASP Piling’s ability to use a combination of piling options to suit a variety of requirements on one site was brought to the fore at Mercato. Hutchinson builders were required to minimise disturbance to roadways and neighbours, whilst allowing the largest basement car-parking footprint possible. ASP Piling’s engineers worked with our clients to come up with a design that incorporated a section of top-down construction, foundation piles, retention piles including both secant and sheet piles, and dewatering for the most cost and time effective outcome. Click here to see the rigs in action at Mercato.

Top-down construction is effective when there is an inability to using anchoring or the ground-level slab is needed immediately. The bulk excavation can continue after the slab is poured, also limiting the need for bracing where the slab is fixed. A section of the Mercato site was needed at ground level throughout construction making top-down construction most effective. Given the overall area and ease of excavation for the remainder of the site, the more traditional bottom up retention and bulk excavation was used for the rest of the site.

Pre-existing buildings close to the site boundary meant that secant piling was used for retention where minimising ground disturbance was necessary. Sheet piling was then used where suitable to keep costs minimised. A total of over 60 lineal metres of secant piling and over 250 lineal metres of sheet piling, both ranging in depths of 7-8 metres was used for basement retention. Additional sheet piling was used for the lift pits. ASP Foundation Piling installed the foundation piles for the project.

Australian Dewatering Systems was engaged to ensure the site remained dry throughout basement construction. The installation of a spear system along with a generator, fuel cell and our environmental equipment, a dewatering management plan and compliance monitoring were all part of the services provided. In keeping with the environmental philosophy behind the Mercato project, ADS has installed a pH, Iron and Sed tank to ensure that all water discharged from site met or exceeded environmental and council standards for the duration of dewatering.

Allegra Apartments

Allegra Apartments are a 114 unit, 15-level unit complex in Southport, Queensland for Andrews Projects. The apartment complex is inspired by 5 star resorts, including rooftop terraces and club lounge, lobby and onsite management. Kyronn Projects are becoming well known as a boutique construction company with a focus on client driven outcomes and high-quality projects, particularly on the Gold Coast and Fiji. They contracted ASP Foundation Piling for the secant retention walls in this project.

Allegra was an ideal site for the use of secant piles as there were existing buildings and major roadways adjoining the site prior to piling and excavation. The client was looking to use all available land area for maximized carparking and basement area. The reduction of noise and vibration was a significant factor for the development with minimal ground disturbance giving the secant piles significant advantage over driven pile alternatives. The series of interlocking piles used also ensured that the flow of groundwater through the site was inhibited, meaning the need for on-site dewatering was not necessary throughout construction where it would have been needed if alternative retention solutions were used.

Over 140 lineal metres of reinforced secant piles were installed at varying depths and sizes according to client, site specific and engineering requirements. ASP’s Soilmec SR40 and SR65 rigs are specifically designed for their CFA capabilities in a restricted area with minimized soil disturbance and high production rates. They were mobilized to site with a variety of drilling tools, mini excavators, grout pump, compressor, cranes and miscellaneous tools needed for the installation of the cantilevered and braced piles. An internal whaler bracing system was implemented as the most practical solution to give a maximized working footprint. The basement construction could then proceed quickly and efficiently, with the removal of the bracing once sufficient internal slabs were in place to support the lateral load on the retaining wall.

The Thornton Project Penrith

The Thornton project originally covered a 40-hectare site next to the existing Penrith city centre and train station. The overall concept was to develop a diverse housing development with high density units and apartment complexes close to the retail and transportation hub with further housing and community centres further out.

Many of the housing, infrastructure and open space works are completed and the mixed use and high-density areas closer to Penrith City Centre are well under way with a number of unit and commercial projects completed or nearing completion. The next phase of the development further from the centre comprising of additional units and housing are starting, with works to continue through to 2020.

Starting in January 2016 we have completed a combination of sheet piling, anchoring and bracing, on five different sites in the high density and mixed-use areas of the development for Moits, Dasco and Urban Apartments.

The sites have all required perimeter wall sheet piling as well as lift shaft and core retention. A total of over 1200 lineal metres of sheet piles and associated anchoring have been completed to date with profiles varying site to site based on client, engineering and geotechnical requirements. Piling depths have varied from 5 metres to 8 metres across the sites.

ASP NSW has supplied and installed over 400 lineal metres of sheet piling around the perimeter and lift shafts for Urban Apartments. The depths of excavation required averaged at approximately 6.5 metres. In addition to this, the Lord Sheffield Circuit sites have required dewatering, filtration and sediment tank hire. On one of the sites a generator was also required as the electricity supply wasn’t available to run the dewatering and filtration equipment.

Thornton Central is a three stage development of mixed use lower level retail and upper level unit complexes. There will be three nine-storey buildings totaling over 300 units in total. Stage 1 of the Thornton Central development required the installation of over 450 lineal metres of sheet piling for the perimeter and lift cores. ASP Piling NSW was contracted to Dasco and undertook the mobilisation, engineering, pre-drilling, installation of sheet piling, bracing and anchoring as required.

ASP Piling undertook the mobilisation, engineering, pre-drilling and installation of over 200 lineal metres of sheet piles around the perimeter as well as for the staircase and lift cores and crane base. The sheet piles were approximately 7 metres in length with associated anchoring and bracing used on the site. The anchors were then stressed to the engineering requirements to ensure the strength of the retention walls.

5 Chester – Rawcorp

Five Chester is located in Southport, Queensland. This six-level apartment complex is positioned close to shopping and transportation as well as the Broadwater Parklands. There are 26 apartments over the six levels of construction excluding the basement.

ASP Piling provided over 120 lineal metres of sheet piling for the perimeter and lift pit, with related anchoring. Sheet lengths varied from 5-6 metres across the site using our patented interlocking sheet profile.

East Quays One, Emandar Group

Located on the waterfront at Biggera Waters on the Gold Coast, East Quays ‘One’ apartment complex was developed by Emandar Group. ASP Piling was contracted to provide over 120 lineal metres of sheet piles for this Emandar Group apartment development. The maximum depth of cut across the site was 3 metres. Australian Dewatering Systems was contracted for a block of 12 weeks for groundwater removal and environmental monitoring and management.

Brooklyn on Varsity

ASP Piling provided a design and construct service contributing a variety of expertise for Stokes Wheeler on the Brooklyn on Varsity project including foundation piling, external shoring, dewatering discharge and environmental management.

The foundation piling consisted of contiguous flight auger (CFA) piles with reinforced steel cages and concrete testing completed to ensure structural integrity. Pile diameters ranged from 450mm to 750mm. The Soilmec SF65 rig and associated drilling augers were used with mini excavator, grout tank and power pack, EWP, compressor and other miscellaneous tools and materials. Pile capping was completed by ASP Piling on this site along with additional crane base piles.

Sheet piling was utilised for shoring the site with anchoring assuring lateral support while the sheets are under load. Using our patented interlocking sheet piles the depth of excavation varied and subsequently different length sheet piles were used between 7 and 8.5 metres. The anchors were supplied, installed and stressed to the required load capacity. Our anchoring rig and stressing equipment were used on the site with additional anchors installed for anchor load testing to be undertaken. Additional bracing was used where anchoring was not a viable option due to adjacent existing buildings.

Australian dewatering systems remediated the site water and discharged off-site once environmental standards were met. A spear system was employed for Brooklyn on Varsity around the external sheet piling wall to minimize space used on site for the system. A pH filtration system and sediment tank were required for compliant discharge water. To ensure effective treatment a dewatering management plan was used including weekly environmental monitoring to ensure all discharged water was compliant with current environmental requirements. A generator was provided for a short period of time to power the pumps prior to electricity being installed onsite. ADS’s use of the Navman system ensures any changes to the output water’s pH levels notify our staff for effective management of water discharge.