Construction World December 2016

The Stefanutti Stocks Axsys Joint Venture (SSA JV) was awarded the contract for the rehabilitation of berths 1-4, 13 and 14 in April 2014, a total of 6 out of 15 berths at Maydon Wharf, the Port of Durban’s largest break bulk, edible oils and dry bulk handling precinct. Maydon Wharf was developed for the then expansion of the Durban harbour, in particular to meet the needs of the growing Witwatersrand. The berths were built of timber, with berths 1-4 and 13 and 14 later rebuilt using steel sheet piles in the 1950s. As the largest and busiest shipping terminal in Southern Africa, the aged berthing structures require far greater capacity than the original 20 000 DWT vessels it was originally designed for to meet current and future demands. The reconstruction of Maydon Wharf consists of demolishing the existing quay structure, the removal of old timber piles, installing a new steel combination wall with concrete cope beam and back of quay layer works. Included in the scope of works is the deepening of the seabed by some 4 m to achieve a draft of 14,5 m CD, with the placement of scour rock adjacent to the quay wall, preventing washout by the propellers of the vessels. The design of a water tight shutter system for the cope beam construction was complex and required rigorous analysis. Initially, a detailed concept of a coffer dam was developed. The coffer dam concept was however discarded due to handling issues that will be caused by the overall weight of the structure (approximately 30 RECONSTRUCTION AND DEEPENING OF MAYDON WHARF: Berths 1-4, 13 & 14 in the Port of Durban REDDFORD HOUSE SCHOOL The newly constructed Reddford House School in Northcliff, Randburg, was capped by an impressive 8 820 m 2 of timber roof trusses of varying styles and configurations by local leader in roof truss technology, LCP Roofing. The exposed timber roof truss work at the school is remarkable. The architectural design and layout of both these main buildings allow for optimal functioning and maximum usage of the space, and upon arrival, the sheer size and aesthetics of the structures make an immediate and profound impact on the viewer. LCP Roofing was tasked with fabricating and erecting exposed timber feature trusses at the gatehouse, main building entrances, piazzas and the main hall. The client brief called for a number of exposed timber roof trusses in as many viable spaces in the buildings as possible, and even the walkways were to be exposed and supported by laminated pine beams at the eaves. While structural soundness was paramount, the aesthetic value of the project was a prominent consideration for the client. The architect, Michael Bishop of Century Property Developments, provided detailed sketches of the client’s requirements, to which the LCP Roofing team answered with precision, ingenuity and attention to detail. LCP Roofing’s design office turned the concept sketches into workable blueprints that allowed the aesthetic components of the project to push boundaries, all while maintaining the highest level of structural integrity, collectively making for an outstanding end result. The trusses in the main hall proved to be challenging, not only from a design perspective, but from a logistical point of view. With a pitch of 27 degrees over such a span, a one-piece truss with a continuous top and bottom chord would simply be too big to deliver. The solution was to fabricate the trusses in three sections

Project information • Company entering: Stefanutti Stocks Marine • Name of client: Transnet • Start date: April 2014 • End date: February 2017 • Main contractor: Stefanutti Stocks Axsys Joint Venture • Principal agent: Transnet Group Capital • Consulting engineer: RCE Consultants • Project value: R760 817 570 (excluding VAT)

tons) and the large windage area provided by the plating. The effects of wind in the marine environment require thorough consideration in ensuring the safety of our teams and for safe handling of loads. Another innovative feat was the construction of cope beam. A sound solution came in the design of a hanging shutter.

As South Africa’s principal container port generating more than 60% of revenue, the Maydon Wharf infrastructure upgrade will result in much needed increased capacity for the country’s economic functioning and growth, and will alleviate the congestion currently experienced. The SSA JV team is proud to have been part of delivering a key development project for the client and ultimately, the contribution to society, it will make in employment opportunities in Durban. Great care is taken to ensure zero harm to the little marine life that exists in the port through efforts in using biodegrad- able grease on sheet pile clutches, and biodegradable shutter oil and foam seals for the shutters.

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Project information • Company entering: LCP Roofing • Client: Reddord House • Start date: June 2015 • End date: December 2015 • Main contractor: Murray & Dickson • Architect: Centrury Property Development • Quantity surveyor: Bain & Heyns Quantity Surveyors and Project Managers • Consulting engineer: C-Plan • Contract value: R46 024 231

instead of one, using two two-ply half modified scissor trusses and a separate one-ply top hat truss. Once completed, the modified design was sent to LCP Roofing’s supporting engineers for final specification on the specific fixing, which was ultimately the use of a sliding shoe on the wall plate on one side of the building as well as the necessary bracing details. Once fabricated and delivered, the scissor trusses had to be assembled on site and the top hat trusses were erected

only once the exposed scissor trusses were in place. A mobile crane was required to hoist the 19,5 metre span trusses above the double volume of the hall and then to lower them, one by one, into position. The crane was only available for a limited period of time, so the LCP Roofing team worked as efficiently as possible, using the apron of scaffolding along the side of the walls of the hall provided by the principal contractor.

2 16 BEST PR O JECTS

DECEMBER • 2016