This invention relates to the field of
composite structure connection technology, specifically to a fatigue-resistant and pull-out-resistant connection structure and construction method for inserting a
helical ribbed steel column into concrete. The method includes establishing a benchmark and laying out the
layout, determining the
helical rib parameters and fixing the
layout,
welding to form an anchorage section and inspecting its quality, installing and aligning the template and guide sleeve, hoisting the steel column and inserting it into the designed depth along the sleeve, fixing the steel column and re-measuring and adjusting its deviation, pouring concrete in
layers to ensure the density of the
helical rib area, curing, and accepting the connection after demolding. The connection structure includes a steel column body, a concrete component, a helical rib anchorage section, and a guide sleeve. The steel column
insertion section is equipped with a helical rib anchorage section, which is inserted into the cast-in-place area through the sleeve. The concrete and helical ribs form an
interlocking body, constituting an integrated anchorage. This invention achieves multi-point distributed force transmission, improves pull-out and
fatigue resistance, suppresses local concrete damage, and provides controllable construction. It is suitable for steel column-concrete connection nodes in bridge reinforcement, industrial plants, etc.