METHOD TO CONTROL STRESSED STATE OF DOUBLE-SPAN BUILDING FRAME WITH THE USE OF FOUNDATIONS WITH JET ENGINES Russian patent published in 2008 - IPC E02D35/00 

FIELD: construction, particularly metal structures for one-story industrial building erection.

SUBSTANCE: method to control inclination and settlement of double-span building frame provided with bridge crane involves mounting central and extreme columns by non-straightening manner to create double-span building frame, wherein central column is of stepped type and has two stanchions and extreme columns are also of stepped type; connecting central column stanchions to grid; creating covering structure girder of rolled-steel beam and providing thereof with gutters in belts; pivotally connecting thereof with extreme columns and central column stanchions arranged in upper column part to create three-span structure having small central span; arranging monitor over central column, wherein the monitor is covered with overhanging beam, which is connected with underlaying girders through vertical hanger brackets and inclined extended struts. Central column stanchions and lower parts of extreme columns are made of pipes having oval cross-sections with diameter ratio equal to 3. The pipes are filled with expansible concrete. As concrete expands it is self-stressed. Distance between central column stanchions is equal to 1/10-1/12 of frame span. Crane girders are supported by central column cantilever so that it is spaced minimal distance from center thereof and a gap is created between the girder and upper column part. The crane girders are installed on extreme columns so that they are arranged at centriods of column cross-sections. Macro-control foundations of all columns are provided with nozzles to be filled with working body. The working body includes powder material plasticized with clay pulp and is provided with ground pumps having impulse hydraulic jacks to control settlement of all macro-control foundations and frame columns. Hydraulic jacks of ground pumps provided with all macro-control foundations are activated to inject plasticized working body in nozzles of macro-control foundation for central column in several portions to create jet thrust. Then macro-control foundations are pulled upwards and removed from ground to stretch frame, to increase support moments in girder over central column stanchions and to decrease span moments in extreme spans.

EFFECT: increased reliability, decreased material consumption and labor inputs for structure erection and maintenance.

3 dwg