The invention discloses a method and structure of deformable connection between a concrete trestle step and a floor. The concrete trestle step is constructed to be of a
layered structure, an embedded iron
casting is installed on a beam of a
floor slab, a deformation joint with a certain size is reserved between the trestle step and the
floor slab, an iron sheet is installed on the upper end face of the concrete trestle step structure and the upper end face of the
floor slab in a complete covering mode, the portion, in the deformation joint, of the iron sheet is of a U-shaped structure, the U-shaped iron sheet extends in the deformation joint, the U-shaped iron sheet is filled with bitumastic oakum, a bitumastic wood-
wool plate is laid on the bitumastic oakum, a
cement mortar bedding cushion is laid on the iron sheet, a section steel plate covers the
cement mortar bedding cushion, the end portion, close to the floor, of the section steel plate is fixedly welded to the embedded iron
casting, a transverse gap is reserved between the section steel plate and the floor, and the gap is plugged through
polyurethane sealing materials after being welded. According to the method and structure of deformable connection between the concrete trestle step and the floor, the requirement of large-scale projects for the deformation joint can be met, the effect of
sedimentation, the effect of
shock prevention and the effect of stretching and contraction are achieved, and performance of
water resistance is improved.