international
construction
may 2014
CONCRETE
36
Early involvement
made and we got a very positive and professional response.
Within a short time we had the drawings and they said ‘we
can do it.’We took a trip toNorthCarolina and purchased the
machines,” he said.
The wall was built using a three-pass operation – first, the
3.8 m base was poured with a 5700-C-MAX using a custom
pavingmold.Then, each 2.1m side wall was poured over steel
reinforcements to complete the canal.
The two 5700-C-MAX slipformers were fitted with custom-
engineered straddle legs to allow them to fit inside the canal to
pour the side walls, while a custom-designed belt conveyor was
alsoneeded to feed the concrete to the hopper on top of the tall
barriermould.
The contractor’s record for a single day’s pours were 274 m
on thewall and 251m on the base. In total, over 15,600m3 of
concretewas used.
However, it is one thing putting concrete in place, but quite
Reed’s towableMixerPump Combo pump has been designed
specifically for shocrete contractors needing a powerful, high
pressure shotcrete pump and a fast, robust mixer.
Two 5700-C-MAX slipformers from Power Curberswere used
to construct 2.1m sidewalls for a stormwater canal project
in Australia.
completely mix 998 kg of refractory material in 3
minutes.
On the higher end of the scale in terms of mixing
capacity, Liebherr has installed a Betomat V 1010
mixing tower for Alfons Greten inEssen, Germany
– the largest of its mixing plants, and one that had
only been installed once previously.
The set up for Alfons Greten consisted of a
1,000 m³ capacity plant and five silos capable of
storing454 tonnes of cement.The contractorwill use
it for producing prefabricated reinforced concrete
elements.
The plant can be customised with two Eirich
mixer systems upon request, and features a
Liebherr Litronic-MPS III mixing plant
control. Additionally, exhaust air filter
systems are in place to reduce dust
emissions, and the plant is also equipped
with heating and insulation to allow
smooth operating duringwintermonths.
Breaking themould
It is often down to manufacturers to
demonstrate the full capabilities of their
machines, and to point out that they can be used
for more than just run-of-the-mill jobs. For instance,
when Australian firm Baldwin Civil NT was approached
about constructing a stormwater canal as part of the new Inpex
natural gas project in theNorthernTerritory, it didn’t know if it
was possible to slipform a 2.1m highwall, according to Power
Curbers.
It had been assumed that the only options for a wall that size
were form-and-pour or pre-cast, according to Baldwin Civil
founder David Baldwin. “Power Curbers was the first call we
Designed for shallow concrete
removal, the Rotolance 2500 uses
ultra-high pressurewater jets to
remove layers of concrete.
A VSI crusher from Sandvik Construction has helped Hawaii-based producer
Hawaiian Cement, supply aggregates for the island’s construction industry. Before
adopting the CV229 from Sandvik, the company had to import sand fromBritish
Columbia, over 3,200 km away.
