http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.16Change: -0.01
R/$ = 12.12Change: 0.04
Au 1180.66 $/ozChange: 4.46
Pt 1122.50 $/ozChange: 0.00
 
 
Note: Search is limited to the most recent 250 articles. Set date range to access earlier articles.
Where? With... When?








Start
 
End
 
 
And must exclude these words...
Close Main Search
Close Main Login
My Profile News Alerts Newsletters Logout Close Main Profile
 
Agriculture   Automotive   Chemicals   Competition Policy   Construction   Defence   Economy   Electricity   Energy   Environment   ICT   Metals   Mining   Science and Technology   Services   Trade   Transport & Logistics   Water  
What's On Press Office Tenders Suppliers Directory Research Jobs Announcements Letters Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Dec 12, 2008

Global economic slowdown not a concern for Gautrain project

Back
Jack van der Merwe talking about the future operating schedule of the Gautrain
 
 
 
Construction|Engineering|Africa|Building|Civils|Concrete|Design|Flow|Gautrain|PROJECT|Property Development|Road|System|Tunnelling|Water|Africa|Gautrain|Flow|Property Development|Tunnelling|Gautrain|Drilling|Gautrain|Water
Construction|Engineering|Africa|Building|Civils|Concrete|Design|Flow|Gautrain|PROJECT|Property Development|Road|System|Tunnelling|Water|Africa|Gautrain|Flow|Property Development|Tunnelling|Gautrain|Drilling|Gautrain|Water
construction|engineering|africa-company|building|civils|concrete|design|flow-company|gautrain-company|project|property-development-company|road|system|tunnelling-company|water-company|africa|gautrain-facility|flow-industry-term|property-development|tunnelling|gautrain-organization|drilling|gautrain|water
© Reuse this



The current global economic slowdown will not significantly influence the budget of the Gautrain project, assures Gautrain project leader Jack van der Merwe.

Van der Merwe explains that the contract for the public-private partnership (PPP), which is a joint venture between the Gauteng provincial government and Bombela Concession Company, which consists of Bombardier Transportation, Bouygues Travaux Public, Murray & Roberts and the Strategic Partners Group as shareholders, is based on a fixed price, scope and time contract, securing the project against fluctuations in the economy. He notes, however that other factors could increase the price tag of the project.

He says that when there is a variation order, for instance, if the project is extended or a deviation on the project is required, the project price will increase. Also, if the consumer price index is higher than initially predicted and the inflation cost is higher than the amount predicted, the province will have to pay the difference. Van der Merwe says that any claims from contractors will also increase the project price; however, no claims have been reported to date.

Another aspect that has to be accounted for, is the exchange rate. All the Gautrain certificates are paid in rands, pounds and euros. Van der Merwe assures that all foreign currencies have been hedged, and consequently, the volatility of the market does not hold any real danger. The project works on a year-to-year basis, which means what is spent in excess one year, can be balanced with the expenditure of the following year. He says the budget is a challenge that every construction site in South Africa faces.

Carriage Construction

As part of the socioeconomic development component of the project 20 of the Gautrain train sets are being assembled at Union Carriage Works in Nigel, in an effort to create jobs and develop local skills.

Van der Merwe says that four complete train sets were manufactured and assembled in London. The remaining train sets were built in segments, and transported to South Africa by sea freight. In total, 24 train sets will be in use on the Gautrain project.

One train set is four carriages long. A static test is carried out on each carriage; the carriage is then linked into a train set, followed by another static test and lastly, a dynamic test, where the train set will run on the tracks at the depot.

Van der Merwe says that dynamic tests will be conducted in February next year. "By February 2009, the trains will be running on the test track. The test track will run from the depot site to the Midrand station, covering a 7-km stretch of track," he says.

All the tracks in the depot have been laid and contractors are now laying the tracks on the main lines. Van der Merwe says that to date, the production on site has mainly concentrated on the civils side of the project, however, significant progress is now being seen on the mechanical and electrical side of the project.

The assembly of the train sets will be completed around the last two quarters of 2009.

Tunnelling Trough

Van der Merwe reports that 9 km, out of the 15 km of tunnelling necessary for the Gautrain project, has already been completed. The tunnels are constructed by means of drilling-and-blasting, cutting-and-covering and by boring through underground sections using the tunnel-boring machine (TBM).

The bulk of the tunnelling is done through drilling-and-blasting. Van der Merwe explains that with the drill-and-blast method a section is primed and filled with dynamite. With every blast, a 5-m segment of the tunnel is created. It takes about 12 hours to repeat the process, and currently, the production rate of the tunnelling stands at about 10 m/d, says Van der Merwe.

He notes that about 12 km of tunnelling has to be completed by drilling-and-blasting. Bombela opened as many faces to the tunnels as possible to achieve this objective quicker and more efficiently

The longest continuous tunnel is the 6-km section between the Marlboro station and the Sandton station, which is why an extra face was opened at Mushroom Farm park. In September this year the connection between the Marlboro portal and Mushroom Farm park was opened, forming a continuous tunnel of just over 4,2 km long.

In instances where the tunnel is shallow the cut-and-cover method is used. This method involves the excavation of a large open cavern in the ground, which is covered up again after the completion of the structure. The Gautrain project uses the cut-and-cover method at its underground stations at Park station, the Rosebank station and the Sandton station, as well as for structures at the Marlboro portal.

Van der Merwe says the cut-and-cover process firstly involves the excavation of a shallow trench. Drilling-and-blasting is used to excavate rock. While the rock underneath the highway is being excavated, lateral supporting pillars are put in place to stabilise the highway and prevent the trench from collapsing.

Traffic flow continues undisturbed on the temporary deviations, while excavation continues. Once the underpass structure has been completed, the surface is reinstated or roofed over. This process is a significant engineering challenge that has been achieved through careful design and construction techniques.

Cut-and-cover tunnels at shallow depth have been used worldwide for centuries. New technology now allows the use of cut-and-cover methods at increasing depths and very close to, or even under, existing tall buildings.

Meanwhile, a 3-km portion of the tunnel between the Park station and the Rosebank station is being excavated using the high-technology TBM.

The R300-million TBM was designed and custom-built by Herrenknecht, in Germany, to cope with the complex underground geological conditions south of Rosebank. Geology in this area features a high-water table, as well as varying degrees of hard rock, sand, and soft, waterlogged soil.

At the front of the TBM machine is a rotating cutting wheel, which excavates the ground. Behind this wheel is a chamber where the excavated material accumulates, before being extracted by a pressure relief discharge system called a screw conveyor.

Excavated soil is then transported by means of a conveyor belt up to the Rosebank shaft opening, and weighed. The front cutter head of the machine advances at roughly 220 m a month. A concrete tunnel lining is built ring-by-ring in the rear.

A computerised guidance monitoring system provides information to the TBM pilot on a continuous basis.

It also allows the pilot to steer the machine, and to continuously monitor the actual position of the TBM in relation to the theoretical centre line of the tunnel at any given location along its route.

Van der Merwe notes that some sinkholes at Oxford road were formed while tunnelling with the TBM machine. However, he points out that this was not a significant engineering challenge, and that the integrity of the tunnel was never in question.

Building Bridges

The Gautrain project requires the construction of 80 bridges and a number of very large culverts, equates to about 11 km of bridges.

Civil engineers constructing the close to 100 piers that will support the viaducts, or elevated railways, have had to develop a technique to overcome the problematic dolomitic ground in the Centurion and Pretoria area.

Between Centurion and Pretoria, the Gautrain alignment traverses through about 16 km of dolomitic ground, of which 5,8 km will be on viaducts, with the remaining portion constructed at surface level. To manage the risk associated with the dolomite rock, the construction of the viaducts includes the sinking and concreting of shafts down to the dolomitic rock, on which the foundations for viaduct piers are laid.

Property Development

Van der Merwe says that one of the key performance indicators of the Gautrain project, where R3-million is spent every hour for 54 months, is the land use around the Gautrain system.

The Gautrain project has affected 1 142 property stands. Van der Merwe reports that the last four property stands have now been handed over to the Bombela concession, giving the consortium access to the entire site.

Van der Merwe points out that when the system was designed, an average of 50% of land within a 2-km radius of the anticipated project was undeveloped, as was 75% within a 5-km radius. "When building a system like the Gautrain, an initial uncertainty develops, with property values falling."

As densification around the system develops, property values begin to increase again. "We expected this would happen in South Africa, but could not predict the pace at which this property explosion would occur," says Van der Merwe.

He reports that investment group Old Mutual will develop 250 000 m2 of mixed land next to the station in Midrand. This development has a value of around R20-billion and will be almost three times larger than the Menlyn shopping centre in Pretoria.

In addition, numerous hotels, offices, and retail centres are in the process of being developed close to the Gautrain Sandton station. Plans include the linking of the station with some of the hotels.

Van der Merwe concludes that the success of the Gautrain system lies in developing a train system that is constantly running on a planned schedule and not just during peak times.

 

Edited by: Laura Tyrer
© Reuse this Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Transport & Logistics News
The last of the 26 mooring units comprising the Port of Ngqura’s automated mooring system (AMS) have arrived at the port and are expected to improve port efficiency and safety, further driving the Transnet National Ports Authority’s (TNPA’s) objective of establishing...
Acting Transnet CEO Siyabonga Gama
Acting Transnet CEO Siyabonga Gama, who was appointed to the position following the surprise secondment of Brian Molefe to Eskom, has placed revenue diversification at the top of his list of immediate priorities, with the weak commodity outlook seen as having the...
Monwabisi Kalawe
Suspended South African Airways (SAA) CEO Monwabisi Kalawe has resigned, with immediate effect, as his relationship with the State-owned carrier had been “irretrievably broken down”. The step was taken following arbitration proceedings between Kalawe and SAA, in the...
More
 
 
Latest News
South African mining and energy adviser Ted Blom has raised a litany of concerns about the state of power utility Eskom and has warned of runaway costs and shortfalls in coal and water, as well as rail capacity. Blom was surprised by the recent buoyancy shown by...
JSE-listed Astrapak will sell specialised packaging systems manufacturer Knilam to Mapflex SA for R17.7-million. The proceeds would be used to reduce Astrapak’s current level of gearing.
The last of the 26 mooring units comprising the Port of Ngqura’s automated mooring system (AMS) have arrived at the port and are expected to improve port efficiency and safety, further driving the Transnet National Ports Authority’s (TNPA’s) objective of establishing...
More
 
 
Recent Research Reports
Steel 2015: A review of South Africa's steel sector (PDF Report)
Creamer Media’s Steel 2015 report provides an overview of the key developments in the global steel industry and particularly of South Africa’s steel sector over the past year, including details of production and consumption, as well as the country's primary carbon...
Projects in Progress 2015 - First Edition (PDF Report)
In fact, this edition of Creamer Media’s Projects in Progress 2015 supplement tracks developments taking place under the Renewable Energy Independent Power Producer Procurement Programme, which has had four bidding rounds. It appears to remain a shining light on the...
Electricity 2015: A review of South Africa's electricity sector (PDF Report)
Creamer Media’s Electricity 2015 report provides an overview of State-owned power utility Eskom and independent power producers, as well as electricity planning, transmission, distribution and the theft thereof, besides other issues.
Construction 2015: A review of South Africa’s construction sector (PDF Report)
Creamer Media’s Construction 2015 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; the key participants in the sector; local construction demand; geographic diversification;...
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
 
 
 
 
 
This Week's Magazine
Sappi Southern Africa CEO Alex Thiel
Forest products group Sappi has confirmed the selection of its 25 MW biomass-to-power project, to be erected at its Ngodwana mill, in Mpumalanga, as a preferred bidder under the South African government’s Renewable Energy Independent Power Producer Procurement...
Information and communications technology (ICT) distributor DCC is making Windows- and Android-operating systems tablets available through retailers and education equipment suppliers to provide school children with affordable, high-performance education tools. The...
Another cement manufacturer is set to enter the Ugandan market, raising hopes that prices will come down and spur growth in the construction industry. National Cement, a Kenyan manufacturer, has unveiled plans to invest $195-million in a new manufacturing plant in...
With growth rates exceeding that in the developed world – at an average of between 4% and 5% between 2002 and 2014 – African countries provide investors with ample reason to tap into booming consumer demand says Manufacturing Circle executive director Coenraad...
The South African Chamber of Commerce and Industry’s (Sacci’s) Business Confidence Index (BCI) decreased by 3.7 index points month-on-month to 89.1 in March.
 
 
 
 
 
 
 
 
 
Alert Close
Embed Code Close
content
Research Reports Close
Research Reports are a product of the
Research Channel Africa. Reports can be bought individually or you can gain full access to all reports as part of a Research Channel Africa subscription.
Find Out More Buy Report
 
 
Close
Engineering News
Completely Re-Engineered
Experience it now. Click here
*website to launch in a few weeks
Subscribe Now for $96 Close
Subscribe Now for $96