Spiral composite structure steel pipe and manufacturing method

The spiral composite structure steel pipe is formed by coaxially sleeving an inner pipe and an outer pipe, and an interlayer is arranged between the inner pipe and the outer pipe; a reinforcing ring is arranged on an interlayer of the inner pipe and the outer pipe, the spiral reinforcing ring is only arranged on the outer wall of the inner pipe in a sleeving mode or is only arranged on the inner wall of the outer pipe in a sleeving mode, and a reinforcing material is filled between the inner pipe and the outer pipe. By the adoption of the spiral reinforcing ring structure, the pipe wall thickness of the spiral combined structure steel pipe can be increased at will according to needs, and meanwhile the high-pressure-resistant performance of the pipe body can be guaranteed. 本发明公开了一种螺旋组合结构钢管，由内管和外管同轴心套装而成，内外管之间有夹层；所述内管与外管的夹层设有加强环，所述螺旋加强环仅套设于内管外壁，或者仅套设于外管内壁，所述内管和外管之间填充加固料，还公开了上述螺旋组合结构钢管的制造方法。采用本申请中的螺旋加强环结构可以根据需要随意增加螺旋组合结构钢管的管壁厚度，同时可以保证管体耐高压性能。