The local provincial standard Technical Specification for Prefabricated Square Steel‑Tube Concrete Composite Special‑Shaped Column Structures (DB37/T 5023‑2021), compiled by Defeng R&D team, was officially implemented. Meanwhile, a series of supporting standards for steel‑structure residential beams, columns and bracings were released.

These specifications fill the domestic technical gaps for special‑shaped concrete‑filled steel‑tube column system. 

Up to now, Defeng owns 2 invention patents, more than 40 utility‑model patents and 6 software copyrights. Our R&D platform includes Shandong Provincial‑level Steel‑Structure System Integration Engineering Laboratory and Post‑Doctoral Innovation Practice Workstation. 

We also invite academicians and industry experts as long‑term technical consultants to continuously iterate our prefabricated building technologies.