Soccer City Stadium, JHB: Piling & Lateral Support
Soccer City was the main events stadium for the FIFA 2010 Soccer World Cup, upgraded at a cost of R3.2 billion to a capacity of 90 000. Verdicon was appointed by ARQ Consulting Engineers to assist with the design and supervision of lateral support on the western side of the stadium, lateral support for the three access tunnel and piling with a combined value of R110 million. This included the piling for the shafts supporting the roof structure, where individual piles were loaded up to 11MN in compression and 6MN in tension.
Gautrain Rapid Rail Link, JHB: Review Team
Staff from Verdicon formed part of the Province Geotechnical Review Team, which is responsible for reviewing all the design of the geotechnical works on the Gautrain Rapid Rail Link. In particular, these staff were involved in reviewing the design of the foundations for the viaducts, overpasses and underpasses, as well as the lateral support for the construction of the underground stations at Sandton, Rosebank and Park Station.
Kusile Power Station, Gauteng: Pile Design
Verdicon reviewed the design of the piles on this new 4800MW power station on behalf of BKS (Pty) Ltd. Massive piled bases are required under the main boiler foundations, with up to 115 x 1200mm diameter piles per base and extremely strict deflection and settlement tolerances. Verdicon was also involved in the supervision of the construction of the piles
Menlyn Reconfiguration Phase 2, PTA: Pile Design
Verdicon was responsible for the design of just over 1,200 piles installed in 2015 & 2016 for the approximately R1-billion upgrade of the Menlyn Mall, in Pretoria. Aside from being responsible for the design, staff from Verdicon profiled and approved the founding of each pile during construction.
Eastgate Mall Extension, JHB: Pile Design
To facilitate extensions to the existing shopping centre, additional capacity was required of the existing piles. As absolutely no disruption to the continuing operation of the shops was allowed, a plan was hatched to tunnel under the suspended floors at the base of the structure and install additional piles next to the original piled foundations from the 70’s. It, however, became evident that the existing piles were quite shallow, and that it would only be possible to tunnel with a headroom of 1.4m to 1.8m to avoid exposing the base of the original piles. To install piles within such limited headroom was extremely challenging, but was eventually accomplished with the help of Terrastrata, using remote controlled bobcats to dig in confined areas. The piles were installed by jacking short precast concrete sections against the existing structure, until the desired load was achieved.
N8 Airport Interchange Bridge, BFN: Pile Design
The Upgrade of the Bloemfontein Airport Interchange required construction of a new bridge over the N8, which due to the upcoming 2010 FIFA Soccer World Cup needed to be completed within an extremely tight programme. Verdicon was responsible for putting forward an alternative pile design, logging additional trial holes, supervising construction and over-seeing the five static load tests, integrity testing and base-drilling.
Port of Ngqura, Port Elizabeth: Pile Design
The Port of Ngqura is a world class deep-water port located along the Indian Ocean approximately 20km north east of Port Elizabeth. As part of the upgrades to the Port of Ngqura, a new administration building is currently under construction. Given the deep Aeolian sand deposits inherent along the coast, the administration building is supported at depth with piled foundations. Verdicon was responsible for the design of the piles and conducted regular inspections during the installation of the piles.
92 Rivonia Road, Sandton: Lateral Support and Pile Design
This basement lies opposite the Sandton City Shopping Centre, near the Sandton Gautrain Station, with vertical lateral support up to 22m deep. Verdicon was responsible for the design of the lateral support and internal load-bearing piles for the structure, both installed by Terrastrata. Verdicon also conducted additional geotechnical investigations required to better understand the highly variable and challenging soil/rock conditions on this particular site.
Menlyn Maine Time Square, PTA: Lateral Support
The Menlyn Maine development in Pretoria, once finished, will comprise a 315,000m2 precinct which includes a shopping mall, a high-end residential component, an office park and hotels. The Time Square portion of this development comprises the hotel, casino and conference venue which is being developed by Sun International. As part of the Time Square development, a 5 basement level parking structure is currently under construction. The design of the lateral support for the 14.5m deep excavation was conducted by Verdicon, who are also providing on going assistance and supervision of the installation of the 9,600m2 of lateral support.
140 West Street, Sandton: Lateral Support Design
Aside from the depth of excavation (i.e. up to 21m), what made this basement unusually challenging was the proximately and complexity of the neighbouring structures around the perimeter of the excavation. In particular, the existing basements at varying distances from the excavated face, which prevented the installation of anchors at shallow depth. This was overcome using massive cantilever piles in some areas, to allow the anchors to be installed at much greater depth.
Alice Lane, JHB: Lateral Support
The Alice Lane Phase 3 project comprises a multi-million rand development located in the heart of Sandton, the richest square mile of land on the African continent. The site is situated on the corner of Alice Lane and 5th Street, just opposite Sandton City and the Sandton Sun Hotel. The development, covers a total area of approximately 5 400m2. Once complete this will comprise an office building with 7 basement levels and a total of 20 stories above ground, with 35 000m2 of office space. Verdicon was responsible for the design and construction supervision of the lateral support, which had a maximum depth of 20.1m and a total area of 3031m2.
Joburg High Court, JHB: Lateral Support
This project comprised lateral support for a 9.0m deep vertical excavation for basement parking, excavated directly next to the existing Joburg High Court building and two other buildings. Joburg High Court is a heritage site, and is over 100 years old, 14 storeys high and full of lawyers. Verdicon was responsible for the design and detailing of the lateral support, and supervision during construction.
Rosebank Mall, JHB: Piling and Lateral Support
This project comprised 192 piles for the construction of the extension to the existing mall as well as a 9.0m deep vertical excavation for basement parking. The new section of the mall was connected to the existing mall via a bridge over Bath Avenue which was founded on piles. The total cost of the development was R920- million. Verdicon was responsible for the design, detailing & supervising the piling and lateral support.
Tunney Ext 12, JHB: Concrete Block Retaining Wall Design
The relatively steep incline of the site, coupled with the need to create a single large platform for a warehouse type structure, required fairly large cut (i.e. up to 15m) and fills (i.e. up to 13m) supported by concrete block retaining walls. The retaining walls in fill are now complete, and were constructed at 70° to a maximum height of 13m with layers of geosynthetic reinforcing tying back the blocks.
Massbuild Warehouse, Waterfall: Concrete Block Retaining Walls
Although numerous concrete block retaining walls were constructed for this development, the particularly impressive section of wall lies on the boundary of the site in cut. This retaining wall was constructed with Infraset Ridgeblok’s at 70° to a maximum height of 12m.
CTM LP9, JHB: Concrete Block Retaining Wall
Construction of the new CTM building, located on land parcel 9 of the Waterfall development, in Midrand, just south of the Alandale Road offramp, began in early 2015. Due to the steeply sloping terrain, the bottom portion of the site has been filled to provide a level platform for construction of the building. This was done utilising a 6.7m high vertical concrete block retaining wall which was designed by Verdicon. Part of the project also included construction supervision of the concrete block retaining wall.
SANBS Constantia Kloof, JHB: Gabion Structure
The SANBS Constantia Kloof project comprised the design and installation of a gabion structure to retain the banks of a tributary of the Klein Jukskei River. Early in 2012 some cracks started appearing in the buildings of the South African National Blood Service’s Constantia Kloof campus. These cracks were attributed to the erosion and movement of the river bank on top of which the campus is located. Verdicon designed and supervised the installation of a 9.0m high gabion structure which was designed to arrest the movement of the embankment and prevent any further erosion occurring, thus protecting the campus and the national’s supply of plasma.
N11, Hendrina: Geotechnical Investigation
Verdicon were appointed as the geotechnical engineers for the upgrade of National Route N11 Section 9 between Hendrina and Hendrina Power Station. Planning and supervision of the investigation, by means of rotary core drilling and test pitting, was undertaken. The project comprised the upgrade of 18.56km of roadway, extensions to two river bridges and a mine haul bridge, cuts, fills and culverts. In addition prospective borrow pits were investigated along with a potential hard rock quarry. Investigations were, also, undertaken at an existing SANRAL quarry to identify possible, additional, sources of aggregate within this existing quarry with a view to future expansion of the area being worked. A full report was compiled which included recommendations for all facets of the project. All work was carried out as per the current SANRAL requirements and all contract administration for the drilling investigation handled.
Tunney and Sunnyrock, JHB: Geotechnical Investigation
In 2013, staff from Verdicon conducted a geotechnical investigation for a new industrial township located in Germiston. The site covers an area of approximately 32Ha. The investigation involved the drilling of large diameter auger holes and rotary core boreholes. In 2015, Verdicon undertook a supplementary investigation in order to delineate the extent and depth of undermining for a proposed bridge and attenuation to be constructed on site. The supplementary investigation was conducted by drilling percussion boreholes within the footprint of the proposed structures. Geophysical surveys using seismic methods have also been conducted on certain platforms in order to determine the transition zone between shallow rock and deeply developed clays.
A geotechnical investigation was conducted at SAB Maltings, in Alrode, for the construction of multiple silos, malting plant, weigh bridge and parking areas. The investigation involved the drilling of 7 rotary core boreholes to a depth of 15m each for the larger structures as well as excavating of test pits utilising a TLB. Verdicon was responsible for assessing of the geological conditions across the site which involved logging of the borehole cores and test pits, assessing laboratory results and writing of a comprehensive report with our findings and recommendations.
Skye Mall, Geotechnical Investigation
A geotechnical investigation was conducted for the proposed Skye Mall development in Kempton Park, which involved the drilling of auger holes as well as boreholes over an area of approximately 12Ha. The development will comprise a retail structure with column loads of between 1500kN and 5000kN. During the investigation 19 large diameter auger holes were drilled over a period of 3 days and 3 boreholes to a maximum depth of 21.2m.
Irene Mall, Centurion: Dolomite Investigations
A design level dolomite stability investigation was conducted in 2015 for the proposed extensions to the north of the existing Irene Mall located in Centurion. The investigation involved the drilling and chip logging of percussion boreholes in order to determine the susceptibility of the site for sinkhole development. In addition, a near surface geotechnical investigation was conducted by excavating test pits in selected positions across the site in order to determine the founding conditions of the site.
Springs Mall, Springs: Dolomite
Verdicon conducted a design level dolomite stability investigation for the new Springs Mall and proposed realignment of the adjacent existing Jan Smuts Road. The new Springs Mall development is located south of the existing road necessitated the realignment of approximately 500m of the road. The investigation was conducted by drilling percussion boreholes over the footprint of the building and along the proposed new route. The risk of sinkholes occurring along the route was assessed and appropriate recommendations provided.
Telkom SA, Centurion: Dolomite Investigation
Verdicon has been involved in multiple dolomite stability assessments for upgrades to the Telkom Facility in Highveld Park, Centurion, since 2012. These assessments included gravity surveys, drilling of numerous percussion boreholes, logging of the boreholes and reporting on the dolomitic inherent hazard class of the site. Verdicon was also responsible for the Dolomite Risk Management Plan for the entire Telkom Facility and the upgrade of the management plan as new projects were completed.