Improvement of exploitation reliability of a magnetic-grab crane by means of removal of residual deformation in main beams

Abstract

In hired results over of inspection of metal structures of main beams of bridge of magnetic-bucket crane are brought, his technical description is given. Reasons of origin of the remaining (negative) bending and his negative influence are educed on operating descriptions and safety of work of crane. The size of the negative bending of main beams of bridge is set in size of a 105 mm at the size of crane span 20 m. Such size of the building deflection resulted in rolling of two light carts of magnetic-bucket crane to the middle of span, their defect and leaning against three skating rinks. Such defect assisted strengthening of wear of flange and increased attenuation time of own vibrations. Previous repairs of beams by means of hot edit heating of areas of lateral walls to the temperature 800-900°C in future negatively affected on operating descriptions of crane metal construction. Expedient complex technology of repair of metal structures for span beams is offered technically with the purpose of extension of time of service of crane. Technology includes: method of hot edit of beam and method of preliminary tension. The sequence of works is described at implementation of repair these methods. The construction of stretching device and his bracing on main beams. In the construction of stretching device supports are included with the set tighteners (lug). Tensioning devices are fastened to the bottom belt of tension beams. In lugs the cored armature is set and she is laid on brackets. The pull of the cored armature is produced by means of hydraulic jacks, fixed by a nut and check-nut. Diagrammatized technological process of complex repair. The offered technology will allow to produce repair works without dismantling of crane and promote reliability of its exploitation