摘要
吊索用钢丝绳在确保钢丝绳常规指标及特高破断拉力的情况下,必须通过JT/T449—2001《公路悬索桥吊索》对疲劳性能的要求,要求在疲劳试验脉冲次数为2×106的情况下,断丝率≤5%。原钢丝绳设计方案存在股间距偏小,内外层股绳的捻距、捻角未控制到最佳等问题,从而导致钢丝绳的断丝率超标。新方案在保持钢丝绳直径、外股结构不变的情况下,采取改变钢丝绳金属芯的结构,增加填充股;金属芯直径加大1.1%,钢丝绳股间距增加2.7%,以消除股间的压痕;增加填塑工艺;改进钢丝绳生产工艺等一系列措施,生产出满足耐疲劳、特高破断拉力要求的吊索用钢丝绳。
Wire rope for sling must pass test on fatigue property of JT/T 449--2001 sling for road suspension bridge under assuring wire rope normal index and super-high breaking tensile force. Fatigue test wire broken ratio is no more than 5% when fatigue test pulse time is 2 × 10^6. The design scheme of former wire rope has the following problems such as strand space is short, lay pitch and lay angle of inner layer and outer layer strand and rope are not controlled the optimum, which causes wire rope broken ratio higher than normal. The new scheme adopts a series of measures such as changing the structure of wire rope metal core, adding filling strand, metal core diameter adding 1.1% , steel wire rope strand space adding 2.7% to eliminate indentation of strands, to add polymer filling process, to improve wire rope production process under the condition of keep wire rope diameter, outer structure unchangeable. Wire rope for sling satisfying the requirements of fatigue resistance, super-high breaking tensile force is produced.
出处
《金属制品》
2009年第5期8-10,共3页
Metal Products
基金
国家科技支撑计划项目
编号2008BAG07B03
关键词
吊索用钢丝绳
结构设计
特高破断拉力
耐疲劳性
弹性模量
wire rope for sling
structure design
super-high breaking tensile force
fatigue resistance
elastic modulus
