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Old September 16th, 2010, 06:46 PM   #41
dysan1
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Another mamouth roads project that has been ongoing and will open new development areas within the city

Gongs for local viaduct



by Editor on September 16, 2010 in News


SSI Engineers & Environmental Consultants, a black empowerment engineering and environmental consultancy – which forms part of the DHV Group – has been awarded the prestigious CESA Glenrand MIB Engineering Excellence Award for its work on the local Mgeni viaduct project.

In addition, it was recognised by the Durban Branch of the South African Institution of Civil Engineering 2010 Awards for “The Most Outstanding Civil Engineering Achievement – Technical Excellence Category”.

The Mgeni viaduct is a 410m long incrementally-launched bridge which forms part of the new main road P577 between KwaMashu and New Germany. This 14km long route will provide the fifth main crossing of the Mgeni River in the Durban region and is located about 10km inland from the coast. Completion of the P577 will provide a direct link between the residential areas of KwaMashu, Ntuzuma and Inanda with New Germany and Pinetown further to the west.

Planning and design of this road was completed in the mid-1990s but construction was delayed until 2002 due to lack of funds. The decision to proceed was based on the significant contribution the road would make to the socio-economic development of the local communities, linking them to new employment opportunities and dramatically reducing transport costs.


The site of the Mgeni viaduct is dominated by the steep rocky escarpment on the left (east) bank of the river, which falls sharply to river level and rises gently towards the west.

To give you an idea of the scale of the project consider: The viaduct comprises twin pre-stressed concrete box girder decks with a total of nine spans – one of 34m, one of 36m, six of 50m and one of 40m.

It is supported by eight 6m x 3.5m featured hollow piers varying in height from 18m to 45m, which were founded on intact sandstone at shallow depth and constructed by sliding. The four tallest piers required stays during launching to prevent excessive horizontal deflections.

Each deck is 3.7m deep by 15m wide and will carry three 3.5m-wide traffic lanes, shoulders and 1.5m-wide sidewalks at the outer edge. The twin decks are separated by a 0.5m gap, which is closed by heavy precast concrete T-sections to form a raised median between the carriageways.

The successful completion of this structure for the KwaZulu-Natal Department of Transport without major incident testifies to the quality of the contractor’s temporary works and control measures during the construction of this technically challenging project.


A massive project built on a grand scale

The SSI team involved in the planning, design and construction management of the Mgeni viaduct has been together since 1981 when the first incrementally launched viaduct in South Africa was constructed across the Umhlatuzana River adjacent to the Marrianhill Toll Plaza on the N3 near Pinetown. Bruce Durow has been intimately involved in the planning and design of both structures and Kurt Hillermann has been the resident engineer on both projects. The depth of experience of this team ensured that a high quality design was presented to the contractors.

Caring for the environment

The natural beauty of the bridge setting has been the inspiration for exceptional attention to the environment. The designers minimised the impact that the location of the substructure would have on the Mgeni River and site staff respected the requirements of the contract which imposed heavy fines for violations of environmental requirements.

The environment was a recurring theme during daily toolbox talks. Specific interventions were the relocation of indigenous trees and the recording and reinstatement of the riverine environment. Numerous audits were carried out and a clean bill of health was obtained.



The Department of Water Affairs gave the project its stamp of approval.

** Information provided by the South African Institution of Civil Engineering

http://theridgeonline.co.za/mgeni-vi...ct-wins-award/
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Old September 16th, 2010, 08:59 PM   #42
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I have some pics of this project I took out from the air. Will post them when I get back to SA.
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Old September 17th, 2010, 09:54 AM   #43
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check it out on google earth, while not finnished you can see its path. i had to check cos i have forgotten names and places
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Old September 22nd, 2010, 06:30 PM   #44
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sounds like was complex. it is an incredibly busy area

The Umgeni-Inanda Inerchange upgrade

Source: Grant Kruger

This project, undertaken by Stefanutti Stocks Civils KZN, comprises the upgrading of the Umgeni/Inanda Split Interchange on the N2 in KwaZulu Natal, for client SANRAL.

The upgrade includes:
• The construction of two new jackspan routes, retaining walls and soil anchor beams, as well as the construction of new infill decks between the existing decks of the bridges across the Umgeni River;
• the demolition of existing traffic barriers on the existing service road bridges and N2 bridges; and
• the construction of 690m of new F-type SANRAL traffic barriers.

Additional work on the contract requires the construction of 450m of structural steel walkway which will be installed on the outside of the service road bridges, thus allowing an additional traffic lane in each direction. The one kilometer long bridge site is situated on the N2 highway and forms part of a very busy intersection. The traffic volume is extremely high in this area, and lane closure was limited to off-peak periods only. Vehicular access is not always possible.

The original method of constructing the 44m long decks over the river would have been to span the piers with a
pre-stressed steel truss, and erect formwork on this truss. This would have necessitated the lowering of the truss
and the formwork units into the river and then moving them on to the next section as work progressed, however for
environmental reasons and ease of construction, the method was changed.

The adopted method therefore involves the precasting of the decks on one side of the river and then moving them into position using a gantry which runs along a rail. The major concern with this method was whether the cantilevers of the existing bridges could carry the weight of the new decks, which weighed 310 ton and 195 ton for the service road and median decks respectively.

Once it was established that the existing decks could carry the load, a concrete rail beam was cast on either side of the gap and a series of steel gantries were placed over the gap to carry the new deck. Seven gantries are being used in series to distribute the load sufficiently across existing cantilevers. The new decks were then cast in position on one side of the bridge and lifted using a computerised hydraulic system and then towed 180m across the river into their final position.

In order to lift the decks, a total of 28 jacks are used, each with a capacity of 30 ton. “The computerised hydraulic
system allows us to control all of the jacks to a 2mm tolerance between jacks” says Grant Kruger, contracts manager. “The system also enables us to tilt the beams in both the transverse and longitudinal directions if required”.
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Old October 3rd, 2010, 05:47 PM   #45
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Cross post from Road & Rail thread....


Hi Guys

I have just had a very interesting read on the NATMAP- KZN report regarding future transport projects in the province. The document can be found at http://www.kzntransport.gov.za/readi...2March2010.pdf

The summary of these projects are in Annexure A, and outlines the plans for road, rail, air and port through to 2050.

Including the proposed high speed rail link, I was shocked at the amount of N2 & N3 upgrades that are planned, with lanes being added every few years. Even more interesting, apparently ACSA is in fact planning a second airport in Durban to compliment King Shaka, and is planned to be opened around 2055.
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Old October 3rd, 2010, 07:57 PM   #46
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Downloading now! thanks for finding and posting. Will have a good read through
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Old October 3rd, 2010, 09:59 PM   #47
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If you want to see the other KZN NATMAP reports, the links to the documents can be found on http://www.kzntransport.gov.za/readi...tmap/index.htm

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Old October 4th, 2010, 01:27 PM   #48
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yup downloaded them all...about 200meg of stuff on there
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Old October 5th, 2010, 02:59 AM   #49
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Those reports were great! Thanks for posting that link!
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Old October 5th, 2010, 09:25 AM   #50
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Hey did they ever finnish the road from waterfall to Sea cow lake? essentially extending Inanda road ( now called M33) down the mountain to Sea cow lake?

It was on the cards when I lived in crestholme 30 years ago
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Old October 5th, 2010, 09:43 AM   #51
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Hey i heard it possibly to drive from Mt Edgecombe/La Lucia to Waterfall? it is safe to drive thru or it not possible? I often drove on N2 then N3 then M14 to Hillcrest and get to Waterfall.
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Old October 5th, 2010, 02:55 PM   #52
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If you travel from Umhlanga you still use the N2 then N3. Its township roads through inanda and kwamashu currently, very long journey on twisty roads i'd imagine. its not even a route option
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Old October 5th, 2010, 05:54 PM   #53
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Yeah. I imagine that your best bet for an alternative route is when the construction of road MR577 is complete (linking Pinetown to the northern areas)
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Old October 5th, 2010, 07:39 PM   #54
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that should cut time down yes. I do not see a road direct from Umhlanga to Hillcrest happening for a number of years yet
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Old October 6th, 2010, 01:41 AM   #55
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Quote:
Originally Posted by SA BOY View Post
Hey did they ever finnish the road from waterfall to Sea cow lake? essentially extending Inanda road ( now called M33) down the mountain to Sea cow lake?

It was on the cards when I lived in crestholme 30 years ago
People often get confused about this issue. To clarify, there are 2 Inanda Roads in Durban:

- Inanda Road (M21): From KwaMashu, past Newlands and Sea Cow Lake, joining the N2.

- Inanda Road (M33): from Hillcrest, past Waterfall, Crestholme, ending in Molweni.

They are unrelated to each other and do not link up. Thus, those people who think that Hillcrest is being linked to the N2 via Inanda Road are mistaken. Yes, Inanda Road is undergoing a major upgrade, and it will link to the N2, but its the M21 Inanda Road (leading to/from KwaMashu), not the M33 Inanda Road (Hillcrest's). The M33 currently ends at a T-junction in Molweni and there is a mountain / hill in front of it. It would costs hundreds of millions, if not billions, to go through that, and continue the link to the N2.
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Old October 6th, 2010, 01:49 PM   #56
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well it was on cards when I lived there as the planning had begun on the route and as a kid I remember the surveyers out in Molweni all the time. if my memory serves me correct, there were plans for bridges not tunnels
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Old October 7th, 2010, 01:18 PM   #57
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well it does not appear to be a current priority. But if you read the reports there are plans for an Umhlanga/KSIA road link to Cato Ridge in the next 20 years
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Old October 9th, 2010, 12:58 PM   #58
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cool 50 years after it was first discussed, jussses makes me sound old
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Old October 13th, 2010, 10:10 PM   #59
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Hi Mike and Durbsboi.

Check your PM's.

So what ya think?
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Old October 14th, 2010, 12:32 AM   #60
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awesome and massive, much bigger than expecting
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