METHOD OF UPGRADE OF TWO-COLUMN UNIVERSAL TEST MACHINE WITH HYDRAULIC AND MECHANICAL DRIVES Russian patent published in 2015 - IPC G01M7/00 

FIELD: test equipment.

SUBSTANCE: invention relates to test of columns for central and non-central compression, and also truss web elements of large-sized industrial and civil structures. The method of upgrade of two-column universal test machine with hydraulic and mechanical drives and the base, fixedly anchored in the basement on which a fixed U-shaped frame comprising a pair of parallel columns the pier caps of which are joined by a spreader bar with a hydraulic pulsator, and also having a frame movable in vertical direction and assembled from the top bearing spreader bar and suspended to it on a pair of screw rods of the bottom spreader bars of the movable frame moved along the vertical line by a worm drive. The hydraulic pulsator is dismantled, the central through hole in the spreader bar is released, the movable spreader bar of the movable frame is dismantled, and screw rods of the movable frame are attached with flange nuts to the spreader bar of the fixed frame. The hydraulic pulsator housing is mounted fixedly at the centre on the machine basement, its plunger is fitted with a spherical hinge, from the control panel the worm drive is started, the design mark is corrected and fixed by height of the top bearing spreader bars of the movable frame. The boundaries of tests of columns are expanded by height up to 5…6 m, the pier cap of the tested column is fitted with the spherical hinge, the column is pulled up, passing it through the released hole in the spreader bar of the fixed frame, the spherical hinge of the pier cap is rested in the centre in the top bearing spreader bar at the design mark.

EFFECT: decrease of labour input of tests of large-sized models of columns, improvement of accuracy of tests in the operating laboratories of universities and institutes.

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