YOUR STEEL STRUCTURE ENGINEERING EXPERT
We are a steel structure fabricator and EPC contractor based in Jining, Shandong, China, with 17 years of experience since 2009 and delivered projects in 60+ countries. Shandong Shijie Heavy Industry Co., Ltd. and its sister company, Henan Hengfeng Steel Structure Engineering Co., Ltd., operate as one manufacturing group under the same ultimate ownership. SynJect is the group’s export brand.
Custom Spatial Grid Structure Large Span Roof Construction
Custom spatial grid structure large span roof construction. Combined with a professional design team and standardized production processes, these systems ensure exceptional structural stability under complex loads and millimeter-level precision. We offer comprehensive, multi-dimensional customization tailored to specific project requirements, including architectural forms (such as irregular curved surfaces and large-span spaces), dimensional specifications (ranging from small industrial buildings to large-scale venues), and functional needs (such as natural lighting, ventilation, and thermal insulation). Through flexible and versatile grid configurations, these roofs infuse buildings with unique visual tension and a futuristic aesthetic, making them an ideal choice for innovative contemporary architectural design. Professional manufacturer of space frame structures for large-span projects. Double/triple-layer truss systems with hollow steel sections (Q355B/ASTM A572) and bolted spherical nodes. Spans 20–200m+. Any geometry: flat, curved, domed, free-form. CNC precision, hot-dip galvanized. 50+ year life. AISC/IBC/Eurocode compliant. ISO 9001 certified.
Customized Spatial Grid Structures Facilitate the Realization of Large-Span Roof Construction
Core Features & Advantages
Custom spatial steel grid roofs feature robust structural integrity, making them an ideal roofing solution for large-span buildings. They provide a comfortable, column-free, and open experience. They offer greater material efficiency and cost-effectiveness, with a wide variety of design options that suit various architectural styles. The products are built to last and require minimal maintenance, ensuring a stable and reliable user experience. Efficient assembly and one-stop delivery services provide a hassle-free and efficient solution for large-scale roofing projects. Steel grid roofs feature a column-free design, making them adaptable to a wide range of architectural needs.
♦ 200m+ clear span, column-free;
♦ 30% lighter, lower cost;
♦ Any shape (flat, curved, domed);
♦ Zero maintenance, 50+ years;
♦ Fast assembly, turnkey service.
Applications
The custom-engineered spatial grid roof structures are ideally suited for architectural projects that prioritize expansive openness, distinctive aesthetics, and long-term, low-maintenance durability. Designed to satisfy the most demanding aesthetic and formal requirements, these structures leverage their flexible customization capabilities and robust performance to achieve a perfect fit, meeting the roofing construction needs of a wide spectrum of high-standard buildings. They demonstrate exceptional performance in public structures—such as large-scale venues and commercial complexes—while also serving the specific design requirements of modern architectural typologies, including exhibition halls, theaters, and transportation hubs.
♦ Stadiums;
♦ Convention centers;
♦ Airports;
♦ Shopping malls;
♦ Factories;
♦ Hangars;
♦ Museums.
Product Parameter
| Products |
Prefabricated steel structure building |
| Type | H-beam, Column, Tie-rod, Truss,Box-column |
| Main Material | Q235B(ASTM A36,S235JR), Q355B |
| Surface treatment | Painting, Galvanized |
| Process-Cutting | Laser cutting, plasma cutting, flame cutting for intricate shapes |
| Forming | Rolling, and bending to meet complex structural designs |
| Welding | MIG, TIG, Submerged arc |
| Machining | Drilling, milling for precise fittings |
| Quality Control | QC inspection, third party inspection |
| Package | As requested |
Vision & Mission
We are committed to providing safe, efficient, and environmentally friendly solutions for global customers through continuous technological innovation and exceptional product quality, driving industry progress and collectively creating a better future.
CONTACT
MORE PRODUCTS
SHANDONG SHIJIE HEAVY INDUSTRY CO., LTD
Headquartered in the High-Tech Development Zone of Jining, Shandong Province, Shandong Shijie Heavy Industry Co., Ltd. and its sister company, Henan Hengfeng Steel Structure Engineering Co., Ltd., operate as a unified manufacturing group under the same ultimate ownership. Globally, we deliver our end-to-end solutions through our dedicated export brand, SynJect.
Drawing on 17 years of export expertise and a proven track record across more than 60 countries, we provide integrated EPC contracting and heavy fabrication. This global reach is backed by our robust manufacturing footprint: an 80,000 m² facility with an annual capacity exceeding 500,000 tons, RMB 120 million in registered capital, and a skilled workforce of over 600 professionals.
Our core expertise spans civil construction, petrochemical facilities, long-distance pressure pipelines, heavy steel structures, pressure vessels, and skid-mounted refueling stations.
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INDUSTRIAL STEEL BUILDINGS
