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Saturday, October 31, 2009 |
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Lateral support to six sites along the Gautrain line
:: News
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Source: Shaun Nell
In late 2008 Stefanutti Stocks Geotechnical (Pty) Ltd was awarded the lateral support contract for Bombela CJV for three sites along the Gautrain line from Frankenwald to Nellmapius Road, (Frankenwald Bridge, Maxwell Bridge, Nellmapius) - with an original tender value of over R7 million. As the project progressed, an additional three sites (Allandale Cute, Dale Road and the New Road Service Bridge) were added, more than doubling the contract value.
Unforeseen geological conditions were encountered at Dale Rd, where we discovered a diabase dyke that crossed the excavation. “This necessitated quick thinking and action so as not to loose too much time on the project,” says Shaun Nell, managing director of the geotechnical division. A unique solution to suit the environment was designed and new equipment and technology was introduced.
“We installed 914mof micro-piles with ourC8 Casagrande Rigin seven working daysgetting the constructionof the wall back on track,”says Shaun.
During this project, which was completed in September 2009 we implemented a variety of different methods of lateral
support. Worth a mention are the spectrum of drilling machines used on the six different sites, as well as the wide variety of tools and machinery used to complete the project. These methods included drilling with:
• a DTH Hammer with a hand boom from scaffold;
• a Furukawa Air Rig;
• a C6 Casagrande Drill Rig;
• a Comacchio Drill Rig;
• Drilling and installing titan bars with a Comacchio Drill Rig;
• Drilling and installing 200mm steel tubular micro-piles with an C8 Casagrande Drill Rig; and
• Drilling and installing 300mm grouted piles with a C8 Casagrande Drill Rig.
During this project a total of 4600m2 gunite was placed, the majority of which required a wood floated finish.
“We always had a minimum of three sites running at the same time,” says Marius van der Merwe, contracts manager. “The seamless communication and greatteam work resulted in the successful completion, to the client’s satisfaction,
in September 2009”.
Other noteworthy quantities:
• Soil Nail Drilling, installation and grouting: 11 365m
• Total gunite: 1 440m3
• Mesh Ref 395 installed: 4 296m2
• Grout Cement: 9 410 bags
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