Method for constructing added storey of building in jack-up manner through steel slide ways

A method for constructing an added storey of a building in a jack-up manner through steel slide ways comprises the following steps of reinforcing a building original foundation (1); calculating required jack-up displacement of each frame column (2); arranging a steel bracket (4) on the periphery of each frame column (2); mounting a jack (5) below each steel bracket (4); completely sawing off each frame column (2) in a suitable range in which the frame column (2) is distant from a building foundation top surface (3) by using a rope saw and immediately inserting a thin steel plate in a fracture of each frame column (2) which is sawed off by the rope saw; arranging angle iron (6) to form steel slide ways (8); jacking up the sawed off frame columns (2) until the upper portions of the sawed-off frame columns are raised to an assigned height; and filling fine aggregate concrete in space between a portion, which is positioned below the upper portion of each frame column (2), of the corresponding steel slide way (8) and the lower portion of the frame column (2) to form a corresponding perpetual bearing column so as to construct the added storey of the building in the jack-up manner. Construction speed is high, manufacturing cost is low, and influences on a surrounding environment are smaller.