transport infrastructure projects
Stefanutti Stocks Civils is currently rehabilitating two bridges on the M2 Freeway in the Central Business District (CDB) of Johannesburg for the Johannesburg Roads Agency (JRA). The project came as a result of an emergency full closure of both the east and west-bound sections between the Maritzburg on- and offramps and the M1 at the Crown Interchange, as a result of the bridges lack of structural integrity. This comes as a result of a lack of maintenance as well as a considerable increase in road traffic since the bridges construction. The scope includes both demolition and reconstruction. The project commenced on 8 February 2019 and is due for completion on 8 October 2019.
Stefanutti Stocks Coastal completed the specialist concrete rehabilitation to the aging Port Nolloth jetty for the Transnet Ports Authority in December 2017. The repair works were undertaken from two temporary access frames cantilevered off the deck and fixed to piles beneath it, ensuring safe access for the repair teams. In addition to the repair works the existing breakwater was removed (via light concrete breakers and labour intensive methods, including the challenges of working in the surf zone) and new armour rocks constructed to the correct gradings. On completion of the works the over seventy-year old jetty gained a further ten years to its operational lifespan.
N4 bridge and culvert rehabilitation undertaken for Trans African Concession (TRAC) between June 2016 and June 2017 consisted of the rehabilitation of ten culverts and ten bridges along the N4 that runs from Pretoria to Nelspruit. The scope remedial works included the repair of corrugated steel invert slabs and replacing the bottom section with concrete; repair of cracks and spalling; and replacing of Thorma joints. An eight-span bridge (350-ton per span) was jacked in order to replace roller and plate bearings with elastomeric bearings, and all damaged parapets across the structures were demolished and reconstructed.
Stefanutti Stocks Coastal completed the rehabilitation of the main access road into Pier 2 at Durban’s Container Terminal for Transnet in 2016. This engineering and construction contract included the construction of temporary deviations with a full traffic management plan; exposing, relocating and encasing a labyrinth of existing services; and the subsequent construction of a high-spec pavement. The requirement that this “super” pavement withstand the heavy-loads entering or exiting Pier 2, and do so for a lifespan of thirty years, resulted in a highly specified layer works design.
Railway infrastructure rectification projects were undertaken for PRASA at KwaZulu-Natal’s Durban and Pietermaritzburg stations, and at Gauteng’s Cleveland station. The projects were undertaken in joint venture with 4Phase and entailed the rectification of safety-critical deficiencies in the current system including the platform, the installation of Tac-tiles to assist visually impaired commuters in navigating the dangerous platform edge and the replacement of the PY-precast sleeper track system with PY-concrete track slabs.
The improvements to the Umgeni and Inanda Road Interchanges (on the N2) were undertaken in a high-traffic volume environment and required both structural works and roadworks. The contract was completed for SANRAL in 2009. The structural works included the construction of new inverted ‘T’ post tensioned concrete decks, to create a single 220-metre long, seventy-metre wide bridge and numerous retaining walls, reinforced concrete and a patented earth retaining system to allow for the widening of the road. Concrete beams were cast between the columns of the existing bridge’s spill-through abutment and retained in position using soil anchors. Road works included relocating services and storm water as well as constructing new on and off ramps and realigning the existing offramps.
Between October 2012 and August 2018 emergency bridge repairs and improvements were undertaken for SANRAL to seven structures on the R37 between Sabie and Nelspruit. A railway bridge required an increase in clearance of 350mm between the road level and bridge soffit; the decks of the remaining six bridges were widened and a 140-metre road shoulder constructed on both bridge approaches. The road-over-river Nels River Bridge required emergency repairs and strengthening due to failure of the central hinge in the existing deck. It was supported with temporary, cast in-situ concrete foundations and four columns prior to widening and strengthening the existing deck. Portions of the deck could be reached using conventional scaffolding, but overhanging cantilever steel frames were utilised for access on the section directly over the river as well as to support the formwork for the new beam and deck cantilever.
Stefanutti Stocks completed the overhaul of Parktown’s St. Andrews Bridge – one of Johannesburg’s busiest access bridges – in May 2010. The scope included the widening of the bridge to accommodate two additional new road lanes and pedestrian walkways, and new concrete barriers for additional safety. The internal and external structural system of the bridge was extensively strengthened and remodeled with its previous two edge beams on each side modified to create new stronger edge beams that would be able to take the required extra loading to the bridge deck.
The rehabilitation of the Noligwa Rail Bridge in Orkney for Anglo Gold Ashanti was completed in 2007. Defective railway track anchor installation and poor drainage were resulting in the corrosion of the deck reinforcing and structural support. A new rail system was installed, the drainage system was improved and extensive concrete rehabilitation to the underside of the bridge was carried out. Protective coatings were applied to critical structure elements of the bridge and repairs were carried out to joints, hand and guard rails.
The Carlisle Bridge rehabilitation project in Grahamstown was completed for the Eastern Cape Tender Board in September 2003. The original bridge had comprised a single-lane steel bridge and its deck had been washed away and replaced three times before Stefanutti Stocks was awarded the rehabilitation project. The scope included widening the bridge by one lane, cladding the extensions to the abutments with dressed stone, and repairing and coating the existing structure.