international
construction
december 2013
CONCRETE
28
A healthy market
towers. Its SK175 cooling-tower formwork, for example, is a fully
mechanised, self-climbing system for pouring 1.5 m high sections
that is said to produce precise forming within short cycling times.
“If Doka is hired for a particular construction lot, we will
develop a custom formwork solution for each individual task,”
said Andreas Guttenbrunner, head of Doka’s competence centre
for power plants.
Peri also tailored its working platforms to the needs of the
energy sector with a contract to support construction of the
1,600 MW coal-fired Eemshaven power plant in Groningen, the
Netherlands. Its Peri Up Rosett Flex modular scaffolding system
provided safe access for welding and insulation work on the plant’s
two 35 m high, 64 m long filters for flue gas desulphurisation.
Assembly of the modular scaffolding for the 35 m high working
platform was carried out using a guardrail in advance, making
rope protection unnecessary. In addition, the Peri scaffolding
worked around the existing steel structure as well as those
walkways already mounted.
1.64 m tall, making it small enough to be cross mounted on a
truck or other carrier. Fork channels on the side and end come
standard.
Offering a maximum output of 23 m
3
per hour, Reed’s S-Tube
allows for pumping grout, pea-gravel concrete, shotcrete mixes,
and “big rock” concrete with aggregates up to 38 mm. The
Mine30 can be powered by an electric, diesel, or air motor.
Falsework & formwork
Manufacturers in the falsework and formwork sector have also
been working to develop equipment and techniques to improve
efficiency and flexibility for contractors. Doka, for instance, has a
range of modular formwork that can be tailored to the complex
demands of the energy sector, where fast construction progress is
a important.
As well as specific systems for dam construction (see the large
structures feature in the November 2013 issue of
iC
), Doka
offers specific systems for building tanks, silos and cooling
Demanding Turkish canal
As few moulds as possible were needed to pave Batman project
H
uge planning and engineering efforts had to be put in before the first concrete could
be placed for a new, 140 km long concrete canal between the cities of Batman and
Diyarbakır in southeast Turkey.
Contractor Fernas Construction & Trade Corp chose a GOMACO four-track GP-2600 to
slipform the canal on the Batman Irrigation Canal project – the contractor’s first slipforming
project. A 100 mm thick layer of concrete was needed, using one machine and as few moulds
as possible for the different profiles.
There were 47 different canal sections in total, with varying dimensions and slopes. The
overall width of the canals varied from 13.2 m to 2.35 m. Slope lengths varied from
5.23 m to as short as 0.81 m.
The four-track GP-2600 was equipped with two moulds – a single slope canal mould for
widths over 9 m, and a sectional trapezoidal mould for 9 m and less.
The profile of the canal was dug with excavators, after which a chain trimmer on the front of
the GP-2600 was used to trim down the high
spots in the grade. Four mobile batch plants
were installed on site, each with the ability to
produce 60 m
3
of concrete per hour.
Concrete was transported in ready-
mix trucks to the paving site. The trucks
discharged onto a conveyor which filled
the hopper of the canal moulds. Behind the
paver, finishers stood on a work bridge and
applied a trowel finish to the surface of the
canal.
Kadir Özkan, project manager for Fernas
Construction said, “The GP-2600 has easily
handled all the dimensions in the project with
its half-width and full width moulds.”
Once the Batman Canal is complete, it
will provide irrigation for an 18,593 ha area
stretching from a dam and hydroelectric
power plant on the Batman River into the city
of Diyarbakır.
Paschal’s Logo.3 formwork was used to support
construction of 9.05 m high walls for the largest sewage
treatment plant in Medina, Saudi Arabia. Work on the
120,000 m² construction site began in June 2012, with
commissioning scheduled for August 2014.
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