Montenegro is a small, mountainous country with 800,000 inhabitants. And it is the only country in the Balkans which does not currently have any freeways of its own. This creates an economic problem as it hinders tourism along the Adriatic coast and makes it difficult to access various parts of the country. Thankfully, a solution is on the way and will be ready in four years' time.
According to Lu Shan, Chairman of the China Road and Bridge Corporation (CRBC), the construction of the first freeway section between Smokovac and Matehevo is set to be completed by 2020. CRBC is heavily involved in the implementation of the project, which is also being largely financed by Chinese funds. The plan is to complete the entire road infrastructure project by 2022.
A mammoth project
In order to connect up the new freeway network, which will snake its way all over Montenegro, 42 tunnels and 92 bridges/viaducts will need to be built. The tunnels are scheduled to be finished by 2020.
Tunisia is Africa's northernmost country, with a coastline along the Mediterranean Sea to the north and east, and two bordering countries: Algeria to the west and Libya to the south-east. Spanning some 163,610 km², it is approximately twice the size of Austria. Tunisia boasts a highly competitive economy and a population in excess of ten million.
First Road Tunnel Project – Sealed Using Geosynthetics
In an effort to stimulate its economic and social development, the Republic of Tunisia is making investments in its road infrastructure. For the first time in the country's history, this is involving the construction of a road tunnel featuring state-of-the-art sealing work that uses geosynthetics.
Over a total length of 3 km, the intention is to link the GP10 and X thoroughfares in the Tunis and Ariana regions by means of four tunnels – with four lanes. The tunnels in this case are covered trenches whose length stretches over 1.2 km in total. Construction is scheduled to be completed within 30 months.
The project aims to not only establish an improved link between the city of La Soukra and the main Tunis arteries, but also reduce the volume of traffic at Tunis-Carthage International Airport and on the major roads that surround it.
This large gold mine in Mexico is the perfect environment for the WELDPLAST S6 extrusion welder from Leister. The high output of 6kg/h (13 lbs) is an fast solution for the lining of heap leach pads, lakes or landfills.
This large gold mine in Mexico was the perfect challenge for the new GEOSTAR wedge welder from Leister. The high welding speed of the GEOSTAR wedge welder is an economic solution for the lining of heap leach pads, lakes or landfills.
With high quality equipment and friendly Leister service, users experience maximum productivity even under extreme environmental conditions.
Fourth Largest Coal-Fired Power Station in the World
Upon completion, the Kusile power station, located in the Mpumalanga district of South Africa, will become the fourth largest coal-fired power plant in the world.
This station, with a total capacity of 4,800MW, is part of the Eskom group (South African public electric utility) and will be the first power station in South Africa to install flue-gas desulphurisation (FGC) to remove sulphur oxides (SOx) from exhaust flue gases.
The search for the most environmentally-friendly solutions not only included the production of electricity itself (once the electricity will be running through the high voltage lines), but was also a concern long before the opening of the power station.
Massive tanks are currently being built in Doha, Qatar. They each have a capacity of 150,000 m3 and will later supply the pre-planned town of Lusail with valuable potable water. To protect the poured concrete foundation which is at risk of corrosion from saline groundwater, special focus is placed on the sealant system. To this end, a special protective layer made of PE is inserted. On the side filled with concrete, nubs ensure that the protective layer is optimally anchored.
A customized automated machine has been developed
The difficulty when connecting the individual sheets in the protective liner is welding them rationally. Leister Technologies AG has developed a special automatic welder for this. The tried and tested hot wedge welder ASTRO was retrofitted so it runs smoothly between the nubs and can weld the overlapping sheets. The ASTRO CPL (Concrete Protection Liner) runs at 1.5 to 2 meters per minute over the 3 mm thick PE sheets. It connects the stiff PE material with its maximum contact pressure of 1500 N securely and without problems.
Leister equipment is “good as gold” in Mongolia installation
In October 2013, two companies based in Ulaanbaatar, Mongolia, Bayan Airag Exploration LLC (a mineral exploration and development company), and Usny Erchim Co., Ltd (Leister Technologies’ official sales partner), found themselves at the Northwestern region of Mongolia collaborating on the Golden Hills Heap Leach Project.
Heap leaching is an industrial mining technique used when extracting precious metals―like copper, uranium, gold, and other compounds—from ore via a series of chemical reactions.
The ore is first crushed and then “heaped” into large piles on plastic sheets which protect the soil against contamination. Once the solvent (typically cyanide) seeps through the piles of material, and bonds with the metal contained therein, the solution is then collected at the bottom of leach tanks as an enriched solution and pumped to a mill where more chemicals are used to separate the cyanide from the valuable metals. Therefore, it is of extreme importance that those plastic layers are absolutely leak-proof.
The island of Saadiyat off the coast of Abu Dhabi in the United Arab Emirates is expanding to become a cultural center for locals and tourists. The „Louvre Abu Dhabi“, the first of several museums, will be constructed by 2015. The ambitious project from the French star architect Jean Nouvel will have a large white dome with a diameter of 180 meters that covers the building like a canopy of foliage. Since the entire complex will be in the water, the sealing system in the subsoil will be of significant importance.
Sophisticated system design
The Abu Dhabi Louvre will be surrounded by water. The grounds will not be flooded until after the completion of the construction. Therefore, protecting the cement foundation is the highest priority. To ensure water-tightness, a two-layered system was selected. A 1.6 mm thick Sikaplan on a TPO basis will be used as the lower geomembrane. The two meter-wide geomembrane is connected with the TWINNY S welder from Leister. This machine welds a double seam with its special nozzle. This way, after the welding process, the water-tightness can be tested in the groove created between the seams using a testing needle and compressed air.
The Niayesh tunnel project is the largest ongoing civil engineering project in Iran. Tehran›s urban tunnel, 10,252 m long, is the second longest tunnel in Asia for auto traffic, after the Baotashan urban tunnel in China which is 10,480 m long.
Built in the shortest time
Two main traffic arteries on multiple levels including ramps and loops were built in Tehran. When the entire project is finished, the traffic situation in the Niayesh section of the city should be decongested and the primary traffic route along the east-west axis transferred. There is also the promise of «a positive change in the city and an improvement in the standard of living» (project text). The tunneling rate was 18.5 m per day and the entire volume an impressive one million m3 ! At times, 5000 people were at work on the project. For the main Niayesh tunnel, 245,000 m2 of geomembrane were built in, of those, 195,000 m2 were single layer PVC sheeting and 50,000 m2 HDPE geomembrane, both 2 mm thick. The entire geomembrane work here lasted only around six months.
Working around the clock
On the 13th of July 2001, Peijing was selected by the IOC to host the Olympic Games 2008. Thereby Peking prevailed against the contenders Paris, Toronto, Osaka and Istanbul. Within less than a year, on August 8th 2008 the competitions start, and which are being awaited with great suspense. Huge construction sites still dominate the picture at the future scenes. There is intense activity everywhere. 30 000 workers are working day and night so that the planned Olympic locations will be finished according to schedule. In spite of the great time pressure, the responsible people are confident that all construction work will be completed by the end of this year.