悬索桥吊索钢丝绳结构稳定化工艺研究

Structure stabilizing technics research of wire rope for suspending bridge sling

钢丝绳残余结构伸长率一般控制在0.2%～0.3%,悬索桥吊索要求残余结构伸长率不大于0.015%。采用预张拉处理对钢丝绳进行结构稳定化。试验采用结构8×41SW+IWR,直径60 mm钢丝绳,张拉力确定为钢丝绳最小破断拉力的55%,持荷时间为1 h。在钢丝绳承受恒定载荷条件下,采用Leica DISTOTE激光测距仪(仪器精度±5/100 000)进行长度测量,并考虑温度影响,钢丝绳经过3次预张拉,其残余结构伸长率为0.011%。对应用于对西堠门大桥的8×41SW+IWR—60,8×41SW+IWR—80,8×55SW+IWR—88规格的吊索钢丝绳张拉情况进行统计,钢丝绳在进行第3次张拉后,残余结构伸长率均不大于0.015%,完全满足JT/T449—2001《公路悬索桥吊索》要求。

Remains structure elongations of wire rope are controlled at 0.2% - 0.3% generally, but suspending bridge sling demands the remains structure elongation of wire rope no more than 0. 015%. Adopting pre-tensile to carry out structure stabilizing for wire rope. The rope structure in test is 8 × 41SW ＋ IWR, rope diameter is 60 ram, tensile force was confirmed as fifty-five percent of minimum breaking force of wire rope, loading time keeps one hour. Under the condition of constant loading to adopt Leica DISTOTE laser space measure equipment （equipment precision is ＋ 5/100 000） to measure, and thought of effect of temperature, the wire rope remains structure elongation reached 0.011% through 3 times pretensile. To do statistics for pre-tensile situation of 8× 41SW ＋ IWR-60,8 × 41SW ＋ IWR-80,8 × 55SW ＋ IWR-88 specs wire rope for XIHOUMEN bridge slings, the results show that remains structure elongation all no more than 0.015%, the wire rope was through 3 times tensile, which can satisfy the requirements of highway suspending bridge slings of traffic industry standard JT/T 449-2001.