Construction World December 2016

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Specialist Contractors or Suppliers

BURGAN CAPE TERMINALS FUEL STORAGE

In 2015 BCT signed a 20 year lease agreement with the Port of Cape Town for the use of the site on the Eastern Mole. The site is a reclaimed area made up of demolition rubble of concrete and the like in a variable soils matrix overlying weak soil horizons to depths of 20 m and more. This presented an engineering challenge to achieve acceptable settlement limits for the proposed large storage tanks. (Holland). JICARO (RSA) and Thebe Investment Corporation (RSA) to develop a much needed fuel storage facility in the Port of Cape Town. Burgan Cape Terminals (BCT) is an independent storage company constituted by VTTI B.V.

Franki was awarded the contract in October 2015. They commenced with the detailed design and mobilised to site in December 2015 to commence site operations in early January 2016. The foundations project was completed on time in July 2016. Franki used the Dynamic Compaction technique to compact the in-situ materials to a design depth of 10 m below ground working level. The compaction was carried out in three different phases known as the primary, secondary and ironing phases, in this order. Compaction of the deepest layer is achieved with the primary phase. The secondary phase achieves compaction mainly in the intermediate layers. The ironing phase ensures overlapping of the initial phases by compacting the shallow layers between the initial prints. Franki employed the services of GETEC, a Keller company, which specialises in vibration and movement/settlement monitoring and recording. A system was installed on existing tanks which allowed for remote monitoring and reporting. Targets and a total survey station were fixed to the existing tanks with remote references and a predetermined reading timetable was set and readings were taken automatically and transmitted to GETEC in the UK for analysis and reporting. This together with a 3 m deep isolation trench allowed operations to proceed without incident or stress, to the existing nearby storage tanks. Safety was as always paramount and Franki and their subcontractor Civils 2000 were awarded the BCT Best Company Safety Awareness trophy for 2016.

Project information • Company entering: Franki Africa • Client: Burgan Cape Terminals • Start date: December 2015 • End date: July 2016 • Main contractor: Chemi-Tech • Subcontractor: Civils 2000 • Project value: R23 100 000

DORMAC QUAY WALL As part of Dormac’s R300-million investment in the Durban Harbour, Dormac Marine and Engineering’s new floating dock facility, ‘Dormac Dock 1’ would go a long way towards meeting the demand for ship repair in South Africa’s busiest harbour. The new facility consists of the state of the art composite floating dock supplied by Ukraine-based Pallada builders and a new 185 m long, 16,9 m high (4 m above and 12 m under water) purpose built quay constructed by Franki Africa. The scope of work consisted of the construction of the main quay structure, the closing in of the existing slipway, installation of two large diameter mooring dolphins and the excavation and dredging of the fill and in-situ harbour silts in front of the quay wall. The engineering design of all civil and geotechnical work was carried out by Franki Africa’s in-house technical team with support from Young and Satharia Consulting Structural and Civil Engineers. The main quay structure was designed for a total retained

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The innovative combination of CFA piling and jet grouting allowed the lead time and construction programme to be reduced to meet the fast-tracked deadlines. The soldier (CFA) piled wall was finished with a continuous capping beam which provided a connection between the soldier piles and the steel tie-back anchors. Precast panels were positioned on the seaward side of the capping beam, which acted both as a wall preventing water ingress as well as the formwork for concreting. The dock will allow an additional 45 dockings per year. An extensive environmental impact assessment was carried out prior to the civil works beginning and strict controls with continual monitoring were required throughout construction. As this project is the first in Durban Harbour to involve the removal of land (rather than the reclamation thereof), the majority of the excavated material was uncontaminated harbour silts and could be dumped at specified marine dump sites or at land fill sites. Both Franki and Dormac pride themselves on exceeding health and safety standards and having amongst the best records in their respective industries. All employees on this project underwent job specific safety training and were subject to regular in-house and external audits ensuring compliance. This contributed to the overall success of the project and resulted in the works being completed with 120 000 injury free man-hours.

height of 16 m under various wave conditions and berthing directions and scenarios. The quay wall consisted of 26 m long, 900 mm diameter continuous flight auger (CFA) piles with gaps between piles sealed with jet grout columns. The soldier pile quay wall was laterally restrained using steel tie-backs anchored to anchor piles behind the wall.

Project information • Company entering: Franki Africa • Client: Dormac • Start date: December 2015 • End date: September 2016 • Main contractor: Franki Africa • Consulting engineer: Young & Satharia

• Subcontractor: Subtech • Subcontractor: Leomat • Project value: R65 948 000

Construction WORLD

DECEMBER • 2016