Contractors World International Vol 6 No 1
laid over the concrete.
Thiago Henrique Menezes, an engineer with Galvão
“The concrete foundation consequently has an
average service life of 30 years, as compared
to roughly six years for an asphalt course. The
maintenance costs for this type of construction are
hence a great deal lower.”
“After reviewing various concrete projects in
Brazil, we decided that the Wirtgen slipform pav-
er SP 850 had the best credentials for the tasks in
hand. Precision and productivity are the key ad-
vantages of this robust machine, which produces
roadways of a superb quality.”
Fast, efficient and versatile
The SP 850 slipform paver is the ideal candidate for the
production of all manner of high-quality concrete pave-
ments. Main applications include the paving of urban
roads, motorways, airport runways, “slab track” and hy-
draulically bound base courses.
The hydraulically telescoping machine frame can be ex-
tended by 1.25 m to the left and to the right, permitting
the use of paving moulds ranging from 2.5 m to 5 m in
width. Working widths of up to 10 m can be achieved by
mounting additional extension elements. All components
can be adjusted to the specified paving width.
Four separately hydraulically driven, steerable track
units ensure excellent manoeuvrability and traction.
The range of equipment includes spreading auger or
spreading plough, dowel bar inserter, central tie bar insert-
er, side bar tie inserter, finishing beam, super smoother
and 3D interface.
The entire paving process is automated from the even
distribution of the concrete to its final smoothing.
First, concrete is distributed by either a spreading au-
ger or spreading plough. The heavy-duty paving mold then
forms the concrete slab as the machine moves forward.
Up to 24 curved high-frequency electric vibrators si-
multaneously ensure the optimum compaction of the
Dowel bars, central tie bars and side tie bars can be
inserted into the freshly placed concrete. A hydraulically
driven hoisting crane for dowel or tie bar packages makes
the process even easier.
Finally, the finishing beam and super smoother ensure
an exceptional finish.
Big Crane AT Work
in Largest Copper
and Gold Mine
For more than three years now a Liebherr LR 1300
crawler crane has been working in the largest copper
and gold mine in Mongolia. The customer particularly
appreciates the crane’s flexible application possibilities
and excellent lifting capacities.
The Oyu Tolgoi copper and gold mine, which was
discovered in 2001, is the largest of its kind inMongolia.
It is situated in the south, in the Gobi desert, near the
Chinese border. Construction work has been underway
The LR 1300 owned by Ivanhoe Mines Mongolia Inc.
was used mainly in the assembly of mining excavators
and mining trucks.
Currently the customer is using the 300-tonne crane
primarily for lifting work requiring a crane with high lift-
Among the numerous advantages of the LR 1300 is
its flexibility due to the large number of possible boom
configurations. Thus, the crawler crane, which was ini-
tially delivered with a 71 m boom, has, in the mean-
time, worked with various boom lengths.
One of the crane’s major advantages is the possibil-
ity to travel with the load on the hook even in rough
terrain which, for example, would not be possible with
a mobile crane.
Oyu Tolgoi is the largest investment project in the
history of Mongolia. From today’s perspective an in-
vestment of over 7 billion dollars can be expected. After
its completion the mine will provide approximately
30% of the gross domestic product of the Central Asian