Abstract: To tackle the challenges of installing super-tall and steeply inclined steel columns and large cantilevered curved steel roofs in confined spaces, a combination of installation construction techniques such as the modular disc buckle support system, steel back-up brackets, steel tie rods, and dual-crane lifting were utilized. This approach facilitated the rational segmented hoisting of a 34 m long, 72 t V-shaped inclined steel column within a limited area, achieving an installation precision of within 10 mm. In conjunction with finite element analysis, a support-free design for large cantilevered steel beams was accomplished, enabling the self-balancing, support-free installation of 17 m long cantilevered steel beams. The adoption of innovative support forms and the technique of segmented hoisting for inclined steel columns and support-free self-balancing installation of large cantilevered steel beams significantly reduced construction time and costs, while also enhancing overall construction efficiency.