Ståltorn lave G1R: Hållfasthetsberäkningar för ståltorn i Renströmsgruvan
Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
The mine in Renström is owned by Boliden and was built in 1952. The steel tower in the concrete tower is now rusting away and Knightec has been commissioned to construct a new steel tower and replace it. In order to do that, new calculations has to be done on what the steel tower has to hold for, and that is presented in this report. In case of an erasure, the chute not breaking normally, it will rise up too high in the shaft. Then the emergency break will cut of the engine and the chute will wedge around the guides in the shaft, break and stop. In case of an erasure the guide will be affected by normal forces of 401 kN. The forces of friction of 40 kN, when the coefficient of friction is 0.01, are transferred to the steel tower and will dislocate the horizontal IPE160 beams upwards at the most 7.30 mm. Therefore the forces of friction will be transferred to the vertical beams as pressure forces of 40 kN. As this report concludes there’s no risk that the beams will crack based on this design.The normal forces that occur are at the most 401 kN. After this the break profile will deform plastically and thus the normal force will not get bigger. The force of friction which is transferred to the guide is totally depending on the coefficient of friction. Research has provided that the coefficient of friction should be between 0.09-0.18. After deliberation with material producers and Knightec, a coefficient of friction of 0.10 has been used, but a comparison both up and down has been made to see the consequences. If the coefficient of friction is too high it can be concluded that the forces on the guide will be very big and the consequences can be that the guide will come apart and the wire can break. If it is like this report shows that the forces of friction are not too big, then the guides will hold and the steel tower will not be significantly affected.
Place, publisher, year, edition, pages
2014. , 21 p.
Teknik, hållfasthetsberäkningar, ståltorn, överspelning, skip, gejder, gruva, Renström, Knightec, Boliden
IdentifiersURN: urn:nbn:se:ltu:diva-57890Local ID: e83a362c-8cbc-43f1-8b94-4a3af5abc9deOAI: oai:DiVA.org:ltu-57890DiVA: diva2:1031278
Subject / course
Student thesis, at least 15 credits
Mechanical Engineering, bachelor's level
Validerat; 20140624 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved