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Na deponiji uglja termoelektrane "Nikola Tesla A" u Obrenovcu (Srbija), rade dva rotorna bagera interne oznake DU1 i DU2, koji su proizved francuske fabrike "Ameco" i kreću se po kružnoj stazi (tzv. polarna staza), uz napomenu da u Istočnoj Evropi rade samo tri bagera tog tipa. Treći rotorni bager istog proizvođača radi na deponiji uglja termoelektrane "Nikola Tesla B" u Obrenovcu. U radu je prikazana analiza stanja vitalne čelične konstrukcije kabine rukovaoca rotornog bagera DU 2, izrađene od cevi različitih prečnika i debljina lima, nakon havarije izazvane udarom kamena u poprečni nosač konstrukcije. Kamen se nalazio u otkopanom uglju jedne od kašika rotora bagera. Prilikom udara kamena poprečni nosač konstrukcije kabine rukovaoca se savio i popucali su zavareni spojevi između prirubnica na sredini poprečnog nosača i zavareni spojevi na mestima veze poprečnog nosača sa vertikalnim nosačima konstrukcije. S obzirom da korisnik bagera ne poseduje projektnu i tehničku dokumentaciju sanacija oštećenja sprovedena je pod predpostavkom da je rešetkasta konstrukcija kabine rukovaoca bagera izrađena od konstrukcijskih čelika, koji se uglavnom primenjuju za izradu rotornih bagera. Na osnovu analiza stanja nakon privremene sanacije oštećenja došlo se do zaključka da je za trajno obezbeđenje integriteta noseće čelične konstrukcije kabine rukovaoca rotornog bagera du2 kao celine potrebno izvršiti zamenu oštećenog poprečnog noseća čelične konstrukcije. There are 2 bucket -wheel reclaimers, internally labelled as DU1 and DU2, made by French manufacturer 'Ameco', that operate at the open pit surface mine which belongs to the thermal power plant 'Nikola Tesla A' in Obrenovac. They are moving along the polar path and it should be noted that there are only 3 reclaimers of that kind in Eastern Europe. The third bucketwheel reclaimer, made by the same manufacturer, operates at the open pit surface mine that belongs to the thermal power plant 'Nikola Tesla B' in Obrenovac. In this paper the state analysis of the vital steel structure of the bucket-wheel reclaimer DU2 operators' cabin, made of pipes of various diameters and thicknesses, after the breakdown caused by a rock that hit the horizontal support of the structure is presented. The rock was located in the excavated coal within a bucket of the bucket-wheel reclaimer. The horizontal support of the operators' cabin structure has Bent and welded joints between flanges at the middle of the horizontal support, as well as welded joints at bonds of the horizontal support with vertical supports of the structure, have cracked due to the impact of the rock. Taking into account the fact that the user of the bucket-wheel reclaimer does not own the design and technical documentation, damage repair was carried out under the assumption that the lattice structure of the operators' cabin was made of structural steels, which are mostly being used for the manufacture of bucket-wheel reclaimers. On the basis of state analysis after the temporary repair of damages the conclusion arose that for the permanent provision of integrity of the support steel structure of the bucket-wheel reclaimer DU-2 operators' cabin as a whole it is necessary to replace the damaged horizontal support.

U radu je na primeru loma i oštećenja sučeono zavarenih spojeva na konstrukciji strele (katarke) bagera dreglajna EŠ 5/45 dat metodološki pristup za analizu uzroka otkaza i saniranje oštećenja. Dati pristup se može primeniti za različite tipove bagera kašikara, a njegova primena u preventivnom održavanju bi doprinela produženju radnog veka bagera. The example of break and failures of welded joints of a structure of the arrow at dredger line ES 4/45 and methodological access for analysis faults causes and sanitation failures are presented in this paper. That access may be adapted for other types of spoonful dredger. Application of this methodology in servicing could contribute prolongation of dredger work life.