METHOD OF COMPLETE RELIEF OF COLUMN REINFORCED CONCRETE CANTILEVER Russian patent published in 2013 - IPC B66C7/00 

FIELD: transport.

SUBSTANCE: invention relates to damping of overhead crane dynamic effects and to relief of column reinforced concrete cantilever dynamics in destruction of concrete and reinforcements by corrosion. In span between adjacent crane girders around column top and at cantilever proper removed is corroded concrete layer to wash the surface. Steel thrust ring is placed nearby column bottom center of gravity with minimum eccentricity to fill said ring with fine expanding concrete so that reliable support for centraliser is formed. Said centraliser makes a column top fixed casing element is erected there around. Symmetric pair of control levers is hinged to the ends at adjustment tension-bars. Connection jack beam is propped up against longer arms of said levers to bolt the beam of upper fixed casing in place level with centraliser mark. Fixed casing side elements are installed to make casing close around top section of mallets. All slots of said casing are sealed by jointing centraliser and top casing beam with steel sheets. Concrete pipelines are connected to casing pipes to force fine expanding concrete via said pipes into casing "from bottom-to-top" to integrate said casing and said column. Damaged cantilever part is removed on shop side in span between bearing parts of adjacent crane girder. Support channel are fitted in said seat to recover design position of crane girder with the help of jack bolts to be tightened as required.

EFFECT: complete recovery of bearing capacity.

4 dwg