In the contemporary landscape of industrial and commercial construction, the demand for robust, fire-safe, and acoustically insulated vertical circulation systems has never been higher. Pan Filled Stairs, often referred to as concrete-filled steel pans, represent a pinnacle of hybrid engineering. By combining the tensile strength of high-grade steel with the compressive durability of concrete, these systems provide a "best-of-both-worlds" solution for high-traffic environments.
The global market for industrial stair systems is projected to grow at a CAGR of 5.4% over the next decade. Rapid urbanization in the Asia-Pacific region and the revitalization of industrial corridors in North America and Europe are driving the demand for pre-engineered, modular stair solutions. China, led by innovators like NJMM (Ningbo Jiulong Machinery Manufacturing Co., Ltd), has emerged as the global hub for high-volume, precision-manufactured steel stair components.
Pan filled stairs are preferred in sectors such as petrochemicals, power generation, and commercial high-rises. Unlike open-grid gratings, the solid infill prevents the passage of smoke and flames between floors, significantly enhancing the Fire Life Safety (FLS) rating of a building. Furthermore, the concrete mass acts as a natural dampener for vibrations and noise, essential in mechanical rooms and public corridors.
By utilizing pre-fabricated steel pans from expert suppliers, contractors can reduce on-site labor costs by up to 30%. The "permanent formwork" nature of steel pans eliminates the need for complex wooden shuttering, allowing for immediate foot traffic during the construction phase before the final concrete pour.
Ningbo Jiulong Machinery Manufacturing Co., Ltd (NJMM) was founded in 1993. As a leader in the design and manufacturing of steel grating, railings, and platform systems, NJMM integrates scientific research with advanced machinery manufacturing. Our commitment to the E-E-A-T principles—Experience, Expertise, Authoritativeness, and Trustworthiness—is reflected in our 30-year track record and our active role in drafting the YB/T4001-2019 Steel Grating Standards.
The transition from manual fabrication to Industry 4.0 automation has revolutionized how pan filled stairs are produced. NJMM utilizes a state-of-the-art technological stack to ensure every tread and riser meets microscopic tolerances.
Utilizing high-precision laser cutting and digital control panel tailoring, we ensure that every steel pan is perfectly square. This eliminates the "creep" often found in large-scale stairwell installations, ensuring that the total vertical rise is accurate to within 1mm over multiple stories.
Our 6 sets of automatic banding robots and 12 self-developed pressure welding lines provide a level of structural integrity that manual welding cannot match. Fusion welding ensures that the carrier bars and cross members are unified at a molecular level, providing maximum resistance to torsional stress.
Inside NJMM's Precision Fabrication Center: Advanced Robotic Integration.
Moving forward, the industry is shifting toward "Green Steel" initiatives. NJMM is proud to be included in the Green Factory Cultivation Pool. By optimizing material usage through FEA (Finite Element Analysis), we reduce steel consumption by up to 15% without compromising load-bearing capacity. Additionally, our engineering team now provides full BIM (Building Information Modeling) support, allowing architects to drop our stair systems directly into their digital twins for seamless interference checking.
Every industrial environment presents unique challenges. A "one-size-fits-all" approach to stairs leads to maintenance nightmares. Here is how we localize our solutions:
In environments with high salinity and moisture, we utilize Hot-Dip Galvanization (ISO 1461 compliant). Our pans are designed with integrated drainage weep holes to prevent water accumulation during the construction phase.
Hygiene is paramount. We offer stainless steel pan variants (304 or 316L) with seamless welding to eliminate bacteria traps, ensuring compliance with global health and safety standards.
Weight is the enemy. Our engineered pan profiles use high-strength, low-alloy steel to reduce the dead load on the building's primary structure while maintaining the stiffness required for a "solid feel" underfoot.
NJMM markets its products mainly to South America, Europe, Oceania, Africa, West Asia, Southeast Asia, Middle East and other countries in the world. Our "Longta" brand is a symbol of quality in global infrastructure.
Our company vision is to be the leader in the steel grating market, the preferred supplier, and a good corporate citizen. The mission of NJMM is to provide top-quality products & services with global expertise; to build a harmonious environment for employees growing together with the company; and to contribute to the advancement of both industry & society.
Participated in drafting and revised the steel grating standard of YB/T4001 in 2019. In 2020, we successfully declared high-tech enterprise and municipal engineering center. In 2021, we obtained the green factory and included in the cultivation pool of specialized and special new enterprises.
With 12 self-developed automatic pressure welding equipment lines, 6 sets automatic banding robots, 2 sets irregular grating fabrication platforms. The annual production capacity of steel grating, stair tread, trench cover, stanchion and steel structures is over 50,000 tons.
Jiulong
