Roads & Bridges

New Construction/Upgrades

  • Stafford’s Post Interchange for the South African National Roads Agency (SANRAL) – SAICE and FULTON award winning project

The project entailed the upgrading and improvement of the existing “T” intersection to a full diamond interchange to improve safety of vehicles and pedestrians. The works consisted of upgrading 2,2km’s (40,000m²) of single carriageway to an undivided dual-carriageway on the N2, 0,7km’s (10,000m²) of rehabilitation, realignment and widenings on the R56, 2,4km’s (16,000m²) of new ramps, and the addition of a 1km climbing lane on the N2, which involved the construction of earthworks and layerworks, with a 135mm asphalt base and a 20mm UTFC friction course.
 

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  • Upgrading Of Dr08002, Lady Frere To Cala, Eastern Cape For The Department Of Roads And Public Works (J.V.)

The works involve the upgrading of 30km of existing gravel road to surfaced standards. Nathoo Mbenyane Engineers involvement was for the design and supervision of 10km of road, of which 4km is blacktop and is to be rehabilitation.

  • Upgrading Of Dr08264, Idutywa to Engcobo, Eastern Cape For The Department Of Roads And Public Works (J.V.)

The works involve the upgrading of 32km of existing gravel road to surfaced standards. Nathoo Mbenyane Engineers involvement was for the design and supervision of 16km of road, encompassing asphalt surfacing, drainage, pipe and box culverts, upgrading of intersections and fencing.

  • Deep water port Infrastructure development, for Coega Development Corporation  

Upgrading of Neptune road, along the existing N2 to dual carriageway standard and the construction of cloverleaf interchange and bridges. Neptune road passing through the interchange under the N2 will become a six- lane dual carriageway road with a 5m wide median and an additional collector distributor on each side.

Road Rehabilitation

  • National Route 2-32 – Pongola to KZN border for SANRAL

This project entailed the rehabilitation of 36 km’s of single carriageway road, provision of 10km of climbing lanes.

  • National Route 2, Section 19 between Mzeke River and Mount Frere In The Eastern Cape for The South African National Roads Agency Ltd (J.V.)

This entailed the rehabilitation of the existing road pavement, the addition of new asphalt base and asphalt surfacing, the provision of climbing lanes, improvement of selected intersections, replacement of fencing, the repair and upgrading of the stormwater system, the provision of concrete lined drains and repairs to bridges and box culverts.

  • National Route N2 E.B Cloete Interchange to Durban International Airport.

15km of dual carriageway road rehabilitation, including construction of 1km of climbing lane with a 180m reinforced concrete pavement This project involved the deep in-situ milling of the shoulder and middle lanes of a 6 lane dual carriageway and overlaid with a 25mm stone mastic asphalt layer. The works also included the construction of a 1km section of climbing lane with a 180mm continuous reinforced concrete pavement.

  • Trunk Road 19/5: Matatiele to Mount Fletcher, Eastern Cape for the Department of Roads & Public Works.

This project involves the rehabilitation and resealing of 63km of road. The works consist of rehabilitation of the first 23km, which also involves earthworks to replace and widen the pavement for shoulders, and resealing the full section of roadway with a Cape Seal.

Provincial and Municipal Roads

  • Diepsloot – Upgrade of Gravel Roads to Surface Standards for the Johannesburg Roads Agency
  • Upgrading of Kokstad Roads – Phase 4 for the Greater Kokstad Municipality
  • Reconstruction – Region A&B (Mayibuye) and region G&F, Aeroton, Suideroord, Kibler Park fir the Johannesburg Roads Agency
  • Somcuba Road upgrade from gravel to surface standards for the Mbombela Municipality   

Road Maintenance

Client: SANRAL

  • Mtamvuna to Marburg: National Route 2 Section 22 Marburg to Mhlungwa 3 year contract, 78 km route
  • National Route 2, between Port Elizabeth and Keiskamma River & National Route 10, between Nanacha and Olifantskop Pass – 3 year contract, 200km route

Flood Damaged Roads

  • Repairs to Flood Damaged Infrastructure for Mpumalanga Government, Department of Public Works, Roads and Transport.
  • Upgrading of Community Access Roads in the White River, Nsikazi Region for the Lowveld Escarpment District Council.

Bridges

  • Stafford’s Post Interchange Bridge for South African National Roads Agency (SANRAL) – SAICE and FULTON award winning project

The bridge consists of a portal structure spanning 40m. The main objective of the structural design of the portal structure was to develop a structure as slender as practically possible. In order to achieve the required structural integrity, the self-weight of the deck structure had to be limited, with the use of void formers. Due to the nature of the arched portal superstructure, high vertical loads combined with unusually high lateral loads on the foundations. One of the unique features of the new bridge is the unusual slenderness of the deck. The deck soffit is curved, with the deck thickness varying from 2m at the portal legs to only 1m at mid-span creating the impression of an arched superstructure.

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  • Widening of Spekboom Bridge

The widening of the existing 4 span structure (over river). The widening in addition to the above bridge includes extension of the pier and abutments, construction of new ear wings.

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  • Elandskop Stream Bridge – Department of Transport (KZN – DOT)   

A widening of a skew portal type reinforced concrete bridge (over river) on the upstream side. Extension of the existing abutments, construction of reinforced concrete wing walls on both the upstream and downstream, constructing parapets on the proposed and existing decks.

  • uMsunduzi River Bridge KZN:

The widening of the existing 4 span structure (over river). The widening in addition to the above bridge includes extension of the pier and abutments, construction of new ear wings.

  • Chambodejois River Bridge

A 21 cell portal culvert structure, designed to canal river water and to support traffic loading. The base slab is a reinforced concrete structure with cut off walls at upstream and downstream.

  • H.L Halls Agricultural Overpass

The existing structure comprised a single span prestressed concrete deck supported on the right hand side by a reinforced earth abutment and on the left by a pier, which incorporates a curtain wall. Due to the widening of the N4 freeway, the existing structure had to be lengthened, by means of a pre-stressed concrete deck structure to match the existing.

  • Maputo Development Corridor – Gladdesspruit Bridge

At the Gladdesspruit River Bridge the N4 is currently a Dual carriageway. The existing structure is 61 m long having six spans of approximately 9.9m. It was proposed to widened the bridge on the upstream side by 4.455m giving it a 12m wide carriageway with two 2.5m shoulders.

The deck would be widened by means of 4 precast concrete M3 beams with a 160mm thick deck slab cast on permanent framework. The existing wall piers and the closed abutments would be extended. Traffic will be deviated on to the westbound carriageway to enable widening of the eastbound bridge to take place unhindered by traffic.

Bridge Management Systems

CLIENT: Department of Transport – Pietermaritzburg
Regional Bridge Engineer – Pietermaritzburg

  • Bridge inspection – Pietermaritzburg and surrounding areas region 5B and 5C