international
construction
june 2014
ROADBUILDING
36
Economy drive
pavers in Russia is particularly exciting. Obviously the Russian
Federation is an extremely important market in terms of road
machinery and I believe this launch shows our commitment to
road building customers across the Federation.”
The C-Series models being launched in Russia feature a new
range of Stage IIIA-compliant Volvo engines designed to offer
improved fuel efficiency evenwhen run on diesel with a higher
sulphur content, as currently found in thatmarket.
Mr Fitch said, “The installation of Volvo engines means
customers can now rely on a single partner to support their
paving investment.
Meanwhile, as reported in the Equipment pages of theMarch
issue of
iC
, Atlas Copco has launched a new range of rollers,
pavers and feeders this year designed not only to be better than
previousmodels, but also safe and environmentally friendly.
Agoodexample is thecompany’snewDynapacCG2300 roller,
whichhas steeringdrums, rather than the central articulationof
theDynapacCC twin drummachines.
A key feature is the ECOMode as standard, which is said
to reduce fuel consumption by more than -15% and noise is
also kept down through the use of a hydraulically-driven,
temperature-guided cooling fan, which only operates when
necessary.
Formore details of this andother new roadbuildingmachines
fromAtlas Copco, see theMarch issue of
iC
.
In the cold milling sector meanwhile, Wirtgen has a new
version of its largeW 200 planer, which has a drum that can be
offset 400mm to the left or right.The company says this feature
of theW 200Hi makes life easier on confined sites, as there is
less need to manoeuvre the whole machine (which weighs 30
tonnes) and also allows contractors towork right up to the edge
of obstructions like barriers and kerb stones.
The edge protector can be raised by 420 mm on both sides
so that the machine can work flush with the edge even at large
working depths.
In action
New technology in the sector is one thing, but as far as
contractors are concerned, it has to have a benefit and a
pay-back.
Tangential oscillation
Compaction in the cold on keymotorway
T
heB 327, Germany’s Hunsrückhöhenstraße connecting northSaarland, Hunsrück (Hahn
airport) andKoblenz, often sees heavy traffic leading to long tailbacks, especially on the
Kastellaun section in theHunsrück.
In the spring of 2012, a bypass project was started. HermannKirchner Bauunternehmung,
based inBadHersfeld, was awarded the contract for the sections before and after the
Trimmbachtal Bridge, and it used the latest generationBomag tandem roller with tangential
oscillation to compact the asphalt.
A bearing coursewith a depth of 140mmwas laid first. Bomag said that on normal days
thiswas not a problem, but because asphalt cools down and goes hard fast in coldNovember
weather andwind, laying and compaction had to be performed quicker in autumn andwinter
months.
Also, on theB 327, connecting sections had to be traversedwhich required accurate
steering and a good overview. Bomag said that working the 140mm deep bearing course
presented no difficulty to theBW 161ADO-5with its 10 tonne operatingweight and 1.68m
wide roller.
Next was connecting sections and processing a longitudinal joint. Usually, rolling is static to
beginwith and subsequentlywith vibration, but Bomag said it was different with this roller.
The tangential oscillation in the rear drum generates horizontally directed shearing forces.
It said this allowed gentle and efficient joint compaction–without the need for vibration in
colder weather.
TheWirtgen
W 200 Hi can
work flushwith
kerbstones or
concrete barriers
>
