Since 2015 BVi has been involved in the design of five wind energy facilities throughout South Africa. One such facility near De Aar has been successfully completed, currently providing 100.5 MW of electricity to South Africa’s power grid, while two others (Perdekraal and Kangnas) are currently in construction with the remaining two (Excelsior and Golden Valley) scheduled to start construction in early 2019.
Combined, the five wind energy facilities will produce a total of 519.8 MW of electricity to the power grid of South Africa, relieving pressure currently put on our natural resources, such as coal, used to produce electricity.
Each wind energy facility has been designed to fit its local conditions.
Technical specifications at Perdekraal:
Turbine Model: Siemens SWT-2.346-108
Turbine Capacity: 2.3MW
Hub Height: 115m
Number of Turbines: 55
Foundation Diameter: 18.5m
Total Road Length: 30km
The project consists of the Rehabilitation/Improvement, Routine Maintenance Works of N220 Chissano - Chibuto and N/C Crz. N220 - N1 (3 De Fevererio) located in the Gaza Province in Mozambique. The two roads fall within the Limpopo floodplain and have been damaged by recent floods, with sections of the roads washed away.
The scope of works includes the reconstruction and/or rehabilitation of 57 km of road including the construction of 52 box culvert structures, varying in size from 2 m x 1 m box culverts to 5 m x 3 m box culverts.
An existing bridge at km 20.5 of Road N220 has undergone severe erosion of the embankments, which has led to the collapse of the bridge approaches. Moreover, the existing bridge piers built on shallow foundations were also noted to show major signs of settlements which contribute to the structure being unsafe and unserviceable. The project scope includes the construction of a new 80m bridge to replace this existing along Road N220.
BVi has been appointed by SANRAL for the detail design and construction monitoring of the realignment
of the N3 from Key Ridge to Hammarsdale. This critical portion of road suffers from heavy delays and congestion,
and this partial realignment forms part of the N3 capacity upgrade, while increasing road safety to users.
Our appointment includes the construction of two new viaducts, each with a separate southbound and northbound carriageway of 22.3m in width, carrying 5 lanes of traffic in both directions. The interesting and challenging aspects of designing both of these structures will be the 22.3m carriageway width, the construction sequences accommodating the current N3 alignment, and the foundation conditions of the site.
The rehabilitation and upgrading of National Route 1, Section 16 between Winburg Interchange (km 77.5) and the Winburg Station (km 89.8)
The project entails the upgrade from a 2 lane single carriageway to a 4 lane dual carriageway. The existing carriageway will also be rehabilitated in full.
Scope of work:
Construction of a second 2 lane carriageway in the northbound direction.
Rehabilitation of the existing carriageway as the southbound carriageway.
All aggregate and pavement layer material is mined and crushed on site. (Approximately 470 000m³ of rock material)
The new carriageway is constructed using rockfill from adjacent cuttings.
300mm stabilized subbase.
150mm G1 base
40mm asphalt with 20mm UTFC surfacing.
The existing carriageway is rehabilitated in full
The existing asphaltic surfacing is milled off for reuse as a recycled asphalt pavement
The existing base and subbase is insitu stabilized as the new subbase.
New 150mm G1 base course overlay.
40mm asphalt with 20mm UTFC surfacing.
Bridges and other structures:
A new road over rail bridge structure is constructed to accommodate the second carriageway.
Several large drainage structures are extended to accommodate the second carriageway.
Truck staging area:
A stop and rest area for trucks are formalised by constructing a reinforced concrete pavement of 2.4ha in size.
This project, located on the N3 National Route between Durban and Pietermaritzburg, is the largest roads projects in the history of BVi Consulting Engineers. The essence of the project is the upgrading of the existing section of roadway from a six lane dual carriageway to a 10 lane facility as well as the realignment of the section to improve level of service and road user cost.
The project is part of the larger upgrade initiative of the N3 corridor which plays a major role in freight transport between Durban and Johannesburg. These two cities are the largest two economies in South Africa and therefore the need to provide well-functioning transport infrastructure between them.
The project covers a 10,2 km section of the N11 situated in KZN just south of the town Volksrust, which is on the border with Mpumalanga. The existing road was rehabilitated and partially re-aligned in 2008 but showed signs of premature failure, requiring investigation and repair.
BVi completed the assessment and design phases of the contract and prepared tender documentation for the proposed repair work. Construction period of 7 months.
Repair work on this contract will consist of the following:
- Shallow patching (50 mm) of existing cracked asphalt surfacing;
- Deep patching (150 mm) of existing surfacing and base layer where failures have occurred;
- Application of a bitumen fog spray to seal off the existing surfacing, followed by the construction of a new bituminous seal surfacing;
- Repair of existing guardrails and fencing;
- Clearing of existing drains and the installation of new drains;
- New road marking
Where there is a road, there is BVi Roads and Rail - even to the middle of the country, at a wind energy facility (WEF) in De Aar.
BVi is assisting the client, Murray & Roberts Infrastructure, with the planning and geometric design of the internal road network, which serves as access from the major roads to the 67 newly constructed wind turbines. Technical assistance is also provided with the foundation design.
Upgrading of main road from N7-National Road to Hondeklipbaai. Approximately 82km of which the first phase was completed in 2015 at a cost of R45m and the second phase will be completed at the end of 2016 at a cost of R 85m. This road forms part of the planned network of connecting communities on the West Coast with the National Road Network, also incorporating a tourist route.
Extension of the D300 (District Road) over 13 kilometres to service various villages in the John Taolo Gaetswe District Municipality, Kuruman. The existing gravel road was upgraded to a road with a permanent tarred service. The total cost was R18m.
The aim of the project was to upgrade the main access road to Brandvlei. This road provides access to 280 households, 2 churches and 8 business plots.
During this project special attention was given to the channeling of problematic stormwater by providing kerbs, stormwater outlets and improving the stormwater outfall.
EPWP teams from the local community completed the following works:
Manufacturing and laying of kerbs and application of prime, stone and slurry layer (Macadam Seal) and stormwater related structures.
The base course was primed and thereafter 26mm of stone was distributed between the kerbs.
Surfacing of the base layer was done with a 30mm thick slurry seal. The slurry was mixed by hand and applied to the stone layer to form the final surfacing of the road.
All of these were completed by 55 local EPWP labourers from the community of Brandvlei.
Total road area covered were 6912 m² at a total cost of R1m.
Northern access road from the R27 to Paballelo, Upington. It was an EPWP funded project. To create temporary work for the local labourers. It was necessary to pave the road with interlocking pavers. Total project cost was about R4,7m.
The upgrading of Road DR3322 from N10 intersection to Karakoel Research Station was an Expanded Public Works funded project to create temporary job opportunities for the local community. The total project cost amounted to R17m.
Technical Support to the In-house Construction Unit of the Department of Roads and Public Works