Construction of collector

 

In the spring 2006, the company Ferrit was approached by Czech party that worked closely with the Moscow corporation that, among other, conducted the excavation of tunnels, collectors and construction work related to the above mentioned task. Moscow company was considering participation in the tender for the construction of the collector under the Moscow River toward the area that was and still is protected by UNESCO. Therefore, it was necessary to carry out the work without disturbing the surface area of ​​the collector opening, or any tunneling and construction work to be carried out at the place of admission of the collector. The height difference between the depth of the design work is carried out under Moscow River and the opening of the collector in the protected area was about 50m and thus the collector had to be unusually driven within the inclination up to 12 degrees. Whereas that the projected net (internal) diameter of the collector was set to 3200 mm, adequate transport facilities was not available on the market that deal with similar construction work. After the preliminary negotiations and studying the basic technical parameters of geological documents, required performance and capabilities of collector supplier, Ferrit suggested the implementation for transport of workers, technological material and tailings using the rack and pinion track NZD600/900 with diesel-hydraulic locomotive and accessories to fulfill all the needs of suppliers. During the 60 days Ferrit has prepared a project for transport and mutually agreed it with supplier.  Subsequently, the sales contract was compiled and Ferrit started the project. Since the beginning of preliminary negotiations to the commissioning of the machinery has been very little time – 6,5 months, while it was largely on the components that have been designed specifically for the specific conditions. The delivery included track with a length of 1380 m, diesel-hydraulic locomotive, 7pcs of platform for transporting all the material, 3pcs of removable buckets with capacity of 5.7 cubic meters for the removal of tailings, complex of discharging equipment from the buckets to the landfill, or into a truck, as well as complete depot equipment, anchoring devices and all accessories for transporting all the necessary material to the Lovat tunneling shield. Installation work started in November 2006 and operation of tunneling shield in the first days of December 2006. The entire tunnel was completed in seven months. Daily movement of excavation reached in good geological conditions up to 12 meters. During tunneling was excavated about 36,000 tons of rock and to a collector were transported over 23,000 tons of concrete, pipe, a binder, a mixture of plaster, sealing foams, electric cables etc. When exporting minerals from the Lovat tunneling shield, the whole kit weighed over 65 tons in the inclined route surpassing of +12 degrees. After completion of collector excavation was necessary to first disassemble tunneling shield and its accessories and drive it back through the collector to the surface in the beginning of the excavation site. Furthermore was carried out from the admission of the collector towards the opening and on the surface any technological material, transport route and accessories. Only used rack and pinion track weighed almost 300 tons. Economic and operational results showed that for given conditions is our solution optimal. Supplier therefore bought in 2007 another set of transport equipment with a total route length of 800 meters. The complex is used at similar tunneling operation in Moscow yet. During the use of our machinery we have available warehouse of spare parts and trained service personnel who are able to flexibly carry out repair and inspection of equipment in Moscow.