http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 14.10Change: -0.11
R/$ = 10.74Change: -0.08
Au 1264.49 $/ozChange: -22.69
Pt 1411.00 $/ozChange: -13.00
 
 
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 Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Oct 12, 2012

New kerb design offers quicker installation

Back
Construction|Johannesburg|Nelson Mandela Bay|Steyn City|Tshwane|Africa|Aggregates|Bosun|Concrete|Road|Roads|Water|Africa|Europe|Germany|South Africa|Bosun Facility|Concrete Paving Solutions Manufacturer|Equipment|Manufacturing|Products|Mandela Bay|David Wertheim Aymes|Water|Proximity|Gert Sibande
Construction||Africa|Aggregates|Bosun|Concrete|Road|Roads|Water|Africa||||Equipment|Products||Water|Proximity|
construction|johannesburg|nelson-mandela-bay-city|steyn-city|tshwane|africa-company|aggregates|bosun|concrete|road|roads|water-company|africa|europe|germany|south-africa|bosun-facility|concrete-paving-solutions-manufacturer|equipment|manufacturing|products|mandela-bay|david-wertheim-aymes|water|proximity|gert-sibande
© Reuse this



Following the success of concrete paving solutions manufacturer Bosun’s redesigned Figure 8C castle bottom kerb, the company is now planning to also produce Figure 7 and Figure 3 barrier kerbs with castle bottoms.

Bosun has already ordered the required equipment from its Germany-based supplier to enable it to add the two new products to its range.

“We expect to start production of the Figure 7 semimountable and Figure 3 Bosun castle bottom kerbs in early 2013,” notes CEO David Wertheim Aymes.

The company launched the Figure 8C castle bottom kerb, which features cavities across the bottom of their surface to allow for easier handling and installation, in May.

The kerbs are manufactured in two lengths – 300 mm and 1 000 mm. Both lengths have a width of 300 mm and a height of 200 mm. The 300-mm-long kerb weighs about 36 kg, while the 1 000-mm-long kerb weighs about 107 kg.

Wertheim Aymes says Bosun found that when they were installed at road construction sites, the castle bottom kerbs were about 40% quicker to install than conventional kerbs.

“When installing conventional kerbs, if the screed surfaces are uneven, installers are forced to lift, refill and relay the kerb. With a castle bottom kerb, it is easier to manoeuvre it into place, as the screed is displaced by the cavities of the kerb, allowing it to sink into the screed,” he explains.

This, in turn, provides better adhesion and has more points of sure bonding, he adds.

Further, the castle bottom kerb, designed and manufactured at the Bosun facility, in Midrand, is less prone to movement than flat kerb surfaces.

Flat bottom kerbs also do not have consistent support from the screed. In some cases, critical areas of the surface may not be in contact with the screed, resulting in kerb breakages once weight is applied from above.

The regular points of sure bonding of the castle bottom kerbs and their proximity to one another negated this possibility, says Wertheim Aymes.

He says that, since their launch, the kerbs have been installed on a variety of roads, such as provincial and municipal roads, on existing road upgrades, as well as on new roads from Orange Farm, about 45 km south of Johannesburg, to lifestyle development Steyn City, located along the Jukskei river, in Johannesburg.

Bosun directly and indirectly supplies various local governments with paving and kerbs. These include the City of Johannesburg, the City of Tshwane, the Nelson Mandela Bay metropolitan municipality and various smaller municipalities like the Gert Sibande district municipality and the Steve Tshwete local municipality, in Mpumalanga.

Kerbs prevent drivers from parking or driving on areas beside a road, while mountable kerbs make it possible for vehicles to access these areas. Kerbs also provide structural support to the pavement edge and prevent the degradation of road edges. They also channel runoff water into storm drains.

Wertheim Aymes says kerb manufacturers should adhere to the SANS 927 specification for precast kerbs, but adds that it is also important to note the way in which kerbs are manufactured.

Essentially, kerbs are manufactured through wet cast or dry cast methods.

In Europe, kerbs have for decades already been manufactured in the dry cast method, whereas, in South Africa, kerbs have traditionally been produced by means of casting a wet concrete mix in moulds, which is then left to cure and then demoulded.

Large stones and other aggregates tend to settle very close to the surface of the kerb and, with slight abrasion to the kerb, the unsightly aggregates are exposed.

Wet cast manufacturing also requires vibration to eliminate air pockets from forming in the concrete. If this is not done for long enough, pin holes form on the surface of kerbs, potentially negatively affecting the quality of the kerbs, he explains.

In addition, the manufacturer’s production capacity is limited by the number of moulds available.

With the dry cast method, a block-making machine forms, compacts and vibrates a dry concrete mix into shape instead of using moulds to form the shape.

Casting production is not restricted by the number of available moulds and Wertheim Aymes says this ensures a reliable supply for all its customers.

Edited by: Chanel de Bruyn
© Reuse this Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Construction News
Updated 1 hour 33 minutes ago Despite various challenges related to the extraction of shale oil and gas, as countries grow accustomed to the idea, the use of shale as a form of energy will be more widely pursued, international oil and gas market analyst Michael Lynch said on Tuesday. Speaking at...
Updated 2 hours 21 minutes ago Regional interconnections and oil discoveries are expected to drive the transmission and distribution industry’s (T&D’s) growth in East Africa, the second-fastest growing region in Africa, global growth consulting firm Frost & Sullivan said on Tuesday. The...
Neil Gopal
The South African Property Owners’ Association (Sapoa) has appealed to Rural Development and Land Affairs Minister Gugile Nkwinti to invoke the discretionary powers available to him under the Spatial Planning and Land Use Management Act of 2013 to prevent...
More
 
 
Latest News
Updated 1 hour 33 minutes ago Despite various challenges related to the extraction of shale oil and gas, as countries grow accustomed to the idea, the use of shale as a form of energy will be more widely pursued, international oil and gas market analyst Michael Lynch said on Tuesday. Speaking at...
Updated 1 hour 36 minutes ago A consortium led by two Kenyan firms won a government tender to build a 1 000-MW, coal-fired power plant, company officials said on Tuesday, part of moves to satisfy rising demand for energy in East Africa's biggest economy. Kenya suffers from regular blackouts due...
TNPA CEO Tau Morwe
Updated 1 hour 42 minutes ago The announcement of the successful bidder for the construction of Durban’s long-awaited passenger cruise terminal was imminent, Transnet National Ports Authority (TNPA) CEO Tau Morwe told delegates at the African Ports Evolution Conference in Durban on Tuesday. ...
More
 
 
Recent Research Reports
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move...
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
Real Economy Insight: Road and Rail 2014 (PDF Report)
This six-page brief covers key developments in the road and rail industries over the past 12 months, including details of South Africa’s road and rail network and prospects for both sectors.
 
 
 
 
 
This Week's Magazine
South African State-owned defence industrial group Denel has announced its fourth consecutive year of profits. The group's results for the financial year 2013/2014 were recently announced at its head office in Centurion, south of Pretoria. Revenues grew by 17%, net...
There is little opportunity for JSE-listed infrastructure company Group Five to grow shareholder value in the domestic market, says CEO Mike Upton. He says value can still be found in the private sector, in the renewable and industrial power sector, as well as in...
The National Association of Automobile Manufacturers of South Africa (Naamsa) has announced the event dates of the 2015 Johannesburg International Motor Show (JIMS). The event will take place from October 14 to October 25, 2015, at the Johannesburg Expo Centre, Nasrec.
UK engineering support services provider Babcock is set to deliver the largest order of global truck manufacturer DAF’s truck tractors in Southern Africa to bulk carrier road-based logistics company Ngululu Bulk Carriers (NBC), with 133 trucks to be delivered in...
Digital radio communications in the African local government space can open up the world, but have many challenges to overcome, notes integration and migration of legacy radio communications infrastructure with digital mobile radio company Emcom Wireless head of...
 
 
 
 
 
 
 
 
 
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