Located in Tuoketuo Industrial‑Park, Hohhot, the 1‑million‑ton‑per‑year ethylene‑glycol project of Inner‑Mongolia Jiutai New‑Material is a landmark key modern‑coal‑chemical project of Inner‑Mongolia Autonomous‑Region, with total‑investment exceeding 10‑billion‑yuan. It ranks among China’s leading coal‑to‑ethylene‑glycol production‑bases and greatly promotes local industrial‑chain upgrading and regional economic‑growth. As a vital environmental‑protection supporting facility for coal‑conveying‑island, this enclosure‑project covers No.1, No.2 and No.3 circular coal‑silos for raw‑coal storage. The silo‑roofs adopt fully‑enclosed spherical bolt‑ball grid‑shell with color‑coated steel‑plate cladding. The sealed‑enclosure restrains fugitive‑dust emission during coal‑stocking and transshipment, helping the coal‑chemical plant realize ultra‑low‑emission and green‑production targets.
The three super‑large‑diameter dome roofs contain massive grid‑shell members and dense bolt‑ball joints, bringing strict requirements on 3‑D curved‑surface positioning, fan‑shaped segment assembly on‑ground, integral lifting and multi‑stage unloading deflection‑control. Situated on Inner‑Mongolia Plateau, the construction site suffers long‑lasting frigid winter, sharp day‑night temperature‑difference, severe wind‑snow load and corrosive coal‑dust. Comprehensive anti‑corrosion and fire‑protection scheme with hot‑dip‑galvanization is customized for grid‑shell members, bolt‑ball joints and support bases. The color‑steel roof‑cladding system is optimized for dust‑sealing, snow‑wind resistance and freeze‑proof durability. BIM construction‑simulation is carried out to check mechanical‑performance during lifting‑unloading process, with real‑time deflection‑monitoring to eliminate deformation risks and guarantee long‑term safety of three huge domes.
We undertook the integrated construction of spherical grid‑shell and color‑steel roof‑cladding for three circular coal‑silos, covering detailed design of spherical dome grid, factory prefabrication of steel‑bars and bolt‑ball components, hot‑dip‑galvanized anti‑corrosion coating, fan‑shaped on‑ground assembly, synchronous integral lifting, support installation, multi‑stage unloading and roof‑plate laying. Strict quality‑control was implemented for component‑precision, bolt‑ball connection tolerance, weld non‑destructive‑testing and grid‑shell deformation‑monitoring. We successfully delivered three enclosed coal‑silo domes and built a high‑quality dust‑control demonstration facility, supporting eco‑friendly infrastructure upgrading of Jiutai coal‑chemical industrial‑base.
