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针对1860 MPa级1×7—15.24钢绞线的不足,提出开发1860 MPa级1×19W—28.6结构多丝大直径高强度低松弛预应力钢绞线设想。确定1×19W—28.6钢绞线各层钢丝直径的比例关系,并设计一定的调整值,计算出外层细丝、外层粗丝、内层丝、中心丝的直径分别为4.95,6.60,6.20,6.40 mm,捻距倍数12.5,捻距360 mm。根据JISG3536—1999标准制定1×19W—28.6钢绞线企业技术要求,设计合理的生产工艺流程,捻制后,在360～400℃进行回火稳定化处理,试制生产的钢绞线成品性能、尺寸等均能满足企业技术要求。
In view of the shortage of 1860 MPa grade 1 × 7-15.24 steel strand, the conception of developing 1860 MPa grade 1 × 19W-28.6 multi-filament large-diameter high-strength low-relaxation prestressing strand is proposed. Determine the proportion of steel wire diameter of 1 × 19W-28.6 strands, and design a certain adjustment value, calculate the outer filament, outer thick filament, inner filament, the diameter of the center filament were 4.95,6.60,6.20 , 6.40 mm, twisting multiples of 12.5, twisting 360 mm. According to JISG3536-1999 standard to develop 1 × 19W-28.6 strand technical requirements, design a reasonable production process, after twisting, 360 ~ 400 ℃ for tempering stabilization, trial production of strand performance, Size and so can meet the technical requirements of enterprises.