This technology is a concrete formwork frame in which a hollow, integrated inner frame with open bottom and ends is formed from TWIP steel inside a rectangular outer frame, then connected using corner and inner brackets. Sound-absorbing material is filled inside the inner frame, and panels are attached by interlocking the panel grooves with the fitting section at the bottom of the outer frame.
Wooden formwork frames lack durability for repeated use, while steel frames are sturdy but heavy, reducing work efficiency. Aluminum frames, which were developed to address these issues, are lightweight but noisy, expensive, and produce five times more CO2 during manufacturing than steel. Furthermore, because their inner and outer frames are welded, they are prone to damage or warping from impact if dropped during form removal.
This technology uses a pair of ultra-high-strength or TWIP steel inner brackets inserted into the ends of the inner frame, with their tips bent outward to fasten to the outer frame. It prevents detachment through the interlocking of a stepped press-fit anti-detachment section and a detent. Silicone sealant is applied to the fitting surfaces, and steel wedge cores are inserted into the wedge pin holes to prevent wear from repeated use. Suitable for wall and slab formwork in apartment and office construction, high-reuse system formwork, and urban sites sensitive to noise, this lightweight, weld-free steel frame reduces both impact noise and damage from drops during form removal.
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