Frame beam prestress reinforcing device and construction method thereof

The invention relates to the technical field of frame beams, and discloses a frame beam prestress reinforcing device and a construction method thereof.The frame beam prestress reinforcing device comprises a plurality of sets of supporting square blocks fixed to the bottom face of a frame beam, a plurality of steel wire pull ropes penetrating through the supporting square blocks and a screwing mechanism arranged on the bottom face of the frame beam and used for screwing the steel wire pull ropes into a twisted shape; the screwing mechanism comprises a locking square column fixed to the bottom face of the frame beam and a spiral cylinder arranged on the bottom face of the frame beam in a sliding mode, the locking square column is provided with a spiral through hole, the spiral cylinder is located on the peripheral face of the spiral cylinder and is provided with spiral lines in a surrounding mode, and the spiral cylinder is in spiral fit with the locking square column. A power mechanism used for driving the spi