悬索桥用钢丝绳吊索制作工艺

介绍悬索桥用钢丝绳吊索的特点及要求。对吊索钢丝绳结构稳定性、结构伸长的处理、制作过程(定尺、下料、热浇铸)长度精确控制工艺进行设计,并将成品钢丝绳吊索应用于生产实践进行检测验证。按提高结构稳定性设计方案制作的吊索钢丝绳的扭矩系数仅为0.003 669 7;钢丝绳预张拉采用直拉方式进行,每段预张拉不低于3次,预张拉力为吊索钢丝绳最小破断拉力的55%,持荷时间60 min。按此方案,钢丝绳仅需进行3次预张拉,后2次的非弹性变形量之差已不大于预张拉长度的0.015%,成品吊索交货长度为恒载状态设计长度,吊索两端耳板销孔间长度误差为±2 mm,达到标准要求。

Production process of wire rope sling for suspension bridge

To introduce the characteristics and requirements of wire rope sling for suspension bridge. The sling wire rope structure stability, treatment of structural elongation, process of length accuracy control in production such as cutting length, blanking and hot pouring were designed. And finished wire rope sling was applied to production practice to be tested. The torque coefficient of sling wire rope produced according to design scheme of improving structure stability was only 0. 003 669 7. Wire rope pre-tension adopted straight pulling way, each part pre-tension was no less than 3 times, pre-tension force was 55% of sling wire rope minimum breaking force, keeping loading time was 60 min. According to the scheme, wire rope only need 3 times pre-tension, the difference of last 2 times non elasticity deformation was no more than 0. 015% of pre-tension length, finished sling delivery length was ideal dead load state, the length error of sling two sides ear plate pinhole was ±2 mm which reached standard requirements.