Located in the new‑south‑west urban district of Hai‑An, Nantong, Hai‑An Sports‑Center is a landmark livelihood‑oriented project covering about 146,000 m². The complex consists of a main gymnasium, constant‑temperature natatorium, national‑fitness building and outdoor sports‑park. Designed as Grade‑B sports venue, it is qualified to host provincial‑level and national‑level sports competitions and large‑scale performances. As a comprehensive urban sports hub integrating professional events, public fitness, recreation and commercial services, it has become a vital cultural‑sports landmark of Hai‑An city. The gymnasium and natatorium adopt large‑span steel‑structure framework together with high‑standing‑seam Al‑Mg‑Mn metal roof enclosure system. The smooth curved‑surface roof presents dynamic modern‑style appearance and achieves harmonious integration with surrounding landscape of the sports‑park.
The two venues feature irregular double‑curved large‑span roof with complex layout of primary‑secondary steel beams. Major construction‑challenges include 3‑D spatial positioning, curved‑purline fabrication, high‑altitude hoisting and installation, edge‑locking & waterproof sealing of metal panels. Long‑term high‑humidity environment inside the natatorium brings corrosive water‑vapor, imposing strict requirements on steel anti‑corrosion, roof air‑tightness, water‑tightness, thermal‑insulation, noise‑reduction and anti‑condensation performance. Situated in coastal area of lower‑Yangtze‑River, the site suffers humid plum‑rain seasons and frequent summer typhoons. The roof system is specially calculated for high wind‑uplift resistance. Hot‑dip‑galvanization plus finishing‑coat protection is applied for steel members. Durable Al‑Mg‑Mn alloy panels, rock‑wool thermal‑insulation, waterproof‑breathable membrane and vapor‑barrier layers are equipped to eliminate risks of water‑leakage, condensate dripping and wind‑induced shedding, ensuring long‑term safe service of venue roof.
We undertook the integrated construction of roof steel‑structure and full metal‑enclosure system for gymnasium and natatorium, covering detailed design of special‑shaped curved roof‑steelwork, steel‑component prefabrication, shot‑blasting anti‑corrosion coating, high‑altitude hoisting & assembly, secondary‑purline installation, laying of thermal‑insulation & waterproof auxiliary materials, cutting, hoisting and curved‑surface lock‑seam installation of Al‑Mg‑Mn standing‑seam panels and detailed construction of gutter drainage joints. Strict quality‑control was implemented on curved‑component fabrication precision, high‑altitude‑welding NDT inspection and metal‑panel mounting accuracy. Waterproof‑critical positions including panel lap‑lock joints, expansion joints and drainage outlets were specially treated. We delivered high‑quality curved metal‑roof works and contributed to the construction of high‑standard modern‑sports landmark in Hai‑An.
