More Work For Wirtgen Pavers - continued
Thiago Henrique Menezes (picture left), an engineer with Galvão Engenharia explains:
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 paver SP 850 had the best credentials for the tasks in hand. Precision and productivity are the key advantages 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 pavements. Main applications include the paving of urban roads, motorways, airport runways, “slab track” and hydraulically bound base courses.
The hydraulically telescoping machine frame can be extended 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 inserter, 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 auger 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 simultaneously ensure the optimum compaction of the concrete.
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 in Mongolia. It is situated in the south, in the Gobi desert, near the Chinese border. Construction work has been underway since 2010.
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 lifting capacities.
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 initially delivered with a 71 m boom, has, in the meantime, worked with various boom lengths.
One of the crane’s major advantages is the possibility 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 investment 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 country.