The Civil Engineering Contractor May 2019 | Page 9

PROJECT OWNERS
N4’s second carriageway
Enza Construction has embarked on a R618.9-million
road upgrade project; a joint venture with Raubex, which
involves the construction of the second carriageway of the
N4 between the Garankuwa Interchange (M17) and the
Brits Interchange (R512). The work, in the Madibeng Local
Municipality, is budgeted to take 36 months and entails the
following new works:
• Accommodation of traffic for the entire contract
• Clearing and grubbing
• Stockpiling of topsoil for future use
• Stockpiling material from box cut for future use if usable
• Benching into existing fills where required
• Widening of existing bridges
• Extension of culverts and stormwater outlets
Project: Road construction
Client: Bakwena Platinum Corridor Concessionaire
Location: North West Province
Road users are going to have a faster, safer ride on the N4.
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Roadbed preparation
Construction of fill
New and/or extension of drainage components
Construction of the selected layers
Construction of the sub-base layer
Construction of the base layer
Construction of surfacing seal — 40mm continuously
graded asphalt surfacing
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P rovision of concrete side drains and guardrails
where required. nn
Oxford Parks success earns Concor Buildings next phase
Concor Buildings has commenced construction on the second
phase of the Oxford Parks project in Rosebank, Johannesburg,
after its successful completion of the first phase last year.
Phase 2 comprises two office buildings, and construction began
in February 2019.
The first block — section one of the Phase 2 project — will
have three office levels of just over 2 800m 2 gross building
area (GBA), built on four basement levels measuring about
11 000m 2 . There will also be a retail component on the ground
floor of almost 950m 2 GBA. The gross leasable area (GLA)
of the office levels will amount to over 2 500m 2 , while in the
retail area it will be about 670m 2 . This building is scheduled
for completion in January 2020. In section two, which is
expected to be completed in September 2020, the building
will comprise five office levels and four basement levels. Office
space will measure about 8 750m 2 GLA and almost 9 700m 2
GBA, while the basement area measures 12 440m 2 . It will also
include a ground floor retail component, this one measuring
1 047m 2 GLA and 1 177m 2 GBA.
Concor notes that the continuing tight margins in
construction also demand that close control be constantly
exerted on site to ensure that all the necessary processes as well
as quality and safety systems are applied. The project deadlines
will, as usual, be challenging to meet, especially with the heavy
rain experienced in the month of February 2019. The ground
and foundation work are particularly weather sensitive, and the
heavy rain has a direct impact on site progress.
www.civilsonline.co.za
Project: Construction
Client:
Intraprop
Location: Rosebank, Gauteng
An auger drill in the foreground is among the equipment at work
for Concor Buildings at Phase 2 of the Oxford Parks project.
Concor notes that the foundation conditions on site consist
of varying rock levels, resulting in a mix of pile caps and
foundations being employed. While pile caps are used where
load bearing piles can be installed, the foundations are required
where excavations for bases need to reach bedrock, resulting in
deep excavations that require substantial mass concrete.
Stairs for fire escapes will also be completed ‘off-shutter’
to reduce the time and resources associated with final
granolithic treads and risers. The use of unitised panels for
the buildings’ façades will also reduce the need for façade
scaffolding, as these units can be installed from the inside.
Another innovation on the project will be to install the
reinforcing of basement columns to a height that spans two
levels at a time. This allows for a more efficient process
of shuttering and pouring columns, which will further
contribute to the pace of the project. nn
CEC May 2019 | 7