Extracted from text ... GROUND ENGINEERING (GEL), Grinaker-
LTA's geotechnical company, has secured one
of its largest precast piling contracts ever,
courtesy of Toyota South Africa's billion
rand expansion project at Prospecton, south
The R30-million contract to manufacture
and install 1 504 precast piles for Toyota's
Paint Plant 3, which is just a part of the
company's major expansion project, was
awarded in November 2004.
The fast-track nature of the contract,
which is due for completion in March this
year, has called for some innovative solutions
to ensure the achievement of the programme.
These include the construction of an onsite
facility to manufacture ..
Extracted from text ... Extract from draft SANS 10162-1
13.12.1 Bolts in bearing-type connections
For bolts subject to shear or tension, ?b shall be
taken as 0, 80.
220.127.116.11 Bolts in shear
The factored resistance developed by a bolted
joint subjected to shear shall be taken as the lesser
(a) the factored bearing resistance, Br, given
in 13.10(c); or
(b) the factored shear resistance of the bolts,
which shall be taken as
Vr = 0, 60 ?b?n?m?Ab?fu
When the bolt threads are intercepted by any
shear plane, the factored shear resistance of any
joint shall be taken as 0, 70Vr. ..
Extracted from text ... THE FAILURE OF ROOF STRUCTURES is of
great concern not only to engineers, but also
to property owners, both commercial and
residential. The cost of a failure can be substantial.
This article attempts to convey some
truths and dispel some myths about the safety
of timber roofs.
In the last few years we have seen both
steel roofs and timber roofs fail. Unfortunately,
probably more timber roofs have failed
than steel roofs, simply because there are far
more timber roofs. Many consulting engineers
and clients who are nervous about the
past failures of some timber roofs have considered
using steel roofs ..
Extracted from text ... What is
'CONCRETE IS A HETEROGENEOUS SYSTEM of solid discrete,
gradiently sized, inorganic mineral aggregates, usually
plutonic (feldspathosilicaceous or ferro-magnesian) or sedimentary-
calcareous in origin, embedded in a matrix compounded
of synthesized polybasic alkaline and alkaloidal silicates
held in aqueous solution and coprecipitate dispersion
with other amphoteric oxides, this matrix being initially
capable of progressive dissolution, hydration, reprecipitation,
gelatinization and solidification through a continuous and
co-existent series of crystalline, amorphous, colloidal and
crypto-crystalline states and ultimately subject to thermoallotriomorphic
alteration, the system when first conjoined
being transiently plastic during which stage it is impressed to
a predetermined form into ..
Extracted from text ... AS THE DEADLINE for the annual Strucad
modelling and detailing competition drew
near, the South African AceCad staff were
delighted with the material that was submitted.
Small and large, projects were diverse,
covering mining, religious, industrial, cultural
and bridge structures.
Some of the many interesting structures
The new 52 m Sauer Street Skywalk, a 50 t
steel bridge linking the Standard Bank
properties on Simmonds and Sauer streets
at first floor level. This was erected on a
Sunday afternoon without any disruption
to traffic. A high degree of accuracy in fabrication
was required so that the structure
could be ..
Extracted from text ... MUCH DISCUSSION and debate has and
continues to take place with regard to the
pros and cons surrounding the question of
hot dip galvanising of reinforcing bars in
concrete. From these debates it is clear that
there are a a number of misconceptions and
that opportunities to improve structural
integrity and service life could be overlooked
or lost through a lack of knowledge
of hot dip galvanised coating.
It can be theorised that, in coastal areas,
for a South African marine environment:
'The life to first annual maintenance of a
black bar reinforced concrete structure
which failed by "concrete spalling" ..
Extracted from text ... THE ?INE DAM and Hydroelectric Power
Project is a multipurpose scheme currently
under construction in Aydin Province in
southeast Turkey. The scheme will provide
regulation storage and assurance of supply
to downstream irrigators, 38 MW of
hydropower electricity, and flood control to
assist in mitigating the significant damages
regularly experienced as far downstream as
the Menderes River valley, just outside
Aydin. The name of the scheme is taken
from both the river to be dammed and the
town a short distance downstream. The project
owner and developer is Turkey's state
hydraulic works organisation, DSI.
At the site of the dam, ..
Extracted from text ... IN DECEMBER LAST YEAR, the President of
the French Republic, Jacques Chirac, officially
opened the Millau Viaduct in France's
southern Aveyron region.
The spectacular cable-stayed, four-lane
bridge set new standards in design and construction
- and is the tallest in Europe.
The viaduct completes the A75 motorway
across the Massif Central, creating a direct
link between Paris and Barcelona. At 2, 4 km
long and 270 m above the river at its highest
point, the Millau Viaduct spans the more
than 2, 0 km wide Tarn Gorge in the Massif
Central mountain range to alleviate the
notorious traffic congestion in ..
Extracted from text ... AFRICON WAS RESPONSIBLE for the investigation,
design and construction supervision
of the bridge repair project as part of the
rehabilitation of the only road link between
the Mozambican towns of Inchope and
Built in 1974, the Pungue River bridge
has 12 arches spanning a total length of 528
m. Severe damage was caused to this crucial
transport link during the civil war in the late
seventies and eighties. Explosives damaged
the bridge to such an extent that two of the
footings of the main arches were severely
fractured and several deck elements were
According to Africon bridge specialist ..
Extracted from text ... BIGEN AFRICA STARTED operations in 1971
and has since then evolved into a leading
multidisciplinary consultancy offering engineering,
management and project finance
solutions to a broad spectrum of clients in
both the private and public sectors.
The company currently operates from ten
offices within South Africa as well as from
offices in Gaborone (Botswana), Port Louis
(Mauritius), Mzuzu (Malawi) and Lagos
(Nigeria). Work beyond the boundaries of
southern Africa is undertaken by Bigen
Africa Offshore Holdings.
To implement and maintain world-class
best practice in providing the best solutions
for its clients, Bigen has created three divisions
- known as centres of ..
Extracted from text ... THE FORMULATION PROCESS of the BEE Construction
Charter has provided a unique opportunity to
start unifying a fragmented South African construction
sector, Mike Wylie, co-chairperson of the Integrated
Management Committee (IMC) of the Construction
Transformation Group (CTCG), believes.
Addressing the 101st annual general meeting of
the Gauteng Master Builders Association (GMBA) in
Midrand, Wylie (who chairs the IMC with James
Ngobeni) said the fragmentation in the construction
industry - 13 associations now constitute the
industry - was a matter that had to addressed in
the entire industry's interest.
'The construction sector would be far better off
going forward in years to ..
Extracted from text ... IN A WELCOME MOVE, Highveld Steel and Vanadium
is set to change its standard structural production
steel from a yield stress of 300 MPa to
350 MPa, an increase in strength of 16, 7 %. As
there will be no increase in the price of the
stronger steel, the move is expected to have a significant
impact on the steel construction industry.
The executive director of the South African
Institute of Steel Construction (SAISC), Dr Hennie
de Clercq, has welcomed the change saying that
the institute has long pushed for it, because of the
significant advantages to the industry.
Extracted from text ... THE CONSTRUCTION OF WHAT WILL BECOME
the world's tallest building is set to begin in
Dubai, United Arab Emirates. The building contract
was awarded to a consortium led by the
South Korean Samsung Corporation.
The Burj Dubai tower will stand 800 m tall
once completed. That will be nearly 300 m taller
than the tallest floored building in the world
today, the Taipei Tower in Taiwan.
The super tall Burj Dubai will be the centrepiece
of a large scale mixed-use development
being developed by Emaar Properties PJSC of
Dubai, which will combine residential, commercial,
hotel, entertainment, shopping and leisure
Extracted from text ... WORLD'S TALLEST
A STELLAR VIEW
THE WORLD'S TALLEST BUILDING, Taipei 101,
opened its observatory and the world's fastest
elevators to the public when the 58-billion Taiwan
dollar 101-floor skyscraper was unveiled
in December 2004 after six years of construction.
It takes just 37 seconds to reach the observatory
on the 89th floor of the 508 m tall
tower in the elevators.
The light green building, the brainchild of
Taiwan's noted architect C Y Lee, resembles
the unfolding of a flower's petals, or sections
of a bamboo plant rising from the ground.
About 33 % of the building's 198 000 ..
Extracted from text ... TWO NEW PRODUCTS for optimum concrete production
developed by Chryso in France are now
available from Chryso South Africa.
The first, Chrysofibre S50, is a second-generation
synthetic macro-fibre that improves the characteristics
of hardened concrete after cracking has
occurred: the presence of the fibre prevents the
cracks from opening.
Chrysofibre S50 consists of polypropylene and
polyethylene fibres. With an elasticity of 5 GPA
and tensile strength of 600 MPa, Chryso's new
macro-fibre can replace metallic fibres and can be
used in much smaller quantities. 'In fact, Chrysofibre
S50 can be applied at just one-seventh of the
dosage for metallic fibres, ' ..
Extracted from text ... THE NATIONAL PORTS AUTHORITY (NPA)
appointed Protekon as the main contractor and
designer for the anchoring of the west quay wall
for the deepening of the harbour of East London.
The west quay is leased to South African Port
Operations (SAPO), which uses the facility to
berth ships for the export and import of motor
vehicles, mainly associated with the Daimler-
Chrysler plant in East London.
In 1999 a car terminal facility was designed
and built in East London for the then Portnet to
cater for the requirements of East London's major
motor manufacturer. Other facilities in and around
the port ..
Extracted from text ... THE R7, 3-MILLION UPGRADING of Amadiba Road
in the Eastern Cape, a 40 km gravel link between
the Bizana road and the Mtentu river mouth on the
coast, is a feather in the cap of the local community.
The road, a vital artery in the life of the people it
serves, had progressively deteriorated to the extent
that it had become virtually impassable - only tractors
and four-wheel-drive vehicles dared tackle it.
The re-construction programme was requested
by local residents. Impoverished conditions - 76 %
of the community live in poverty - prevailed and a
lifeline needed to be set in ..