Standardized lengthening construction method for steel members of any length

The invention provides a standardized lengthening construction method for steel members of any length, and belongs to the technical field of steel members. The standardized lengthening construction method for the steel members with the any length comprises the steps that S1, a ladder climbing piece I is assembled, specifically, a framework of the ladder climbing piece I is composed of two pieces of angle steel I, four steel plates I, a plurality of round steel I and two connecting lug plates I, the two pieces of angle steel I are arranged in parallel, and the plurality of round steel I are fixedly connected between the two pieces of angle steel I at equal intervals; S2, a ladder climbing piece II is assembled, specifically, the ladder climbing piece II is provided with a plurality of sections, a framework of each section of the ladder climbing piece II is composed of two pieces of angle steel II, a plurality of pieces of round steel II, two steel plates II and two connecting lug plates II; and S3, a ladder cl