起重吊装钢丝绳的选用

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1、起重吊装钢丝绳的选用一钢丝绳类型及选用：表1-8序号钢丝绳类型一般适宜选用的场合16×19+1钢丝绳用作缆风绳、拉索，即用于钢绳不受弯曲或可能遭受磨损的地方26×37+1钢丝绳用于滑车组中，即绳子承受弯曲时采用，作为穿绕滑车组起重绳等36×61+1钢丝绳用于滑车组和制作千斤绳（吊索）以及绑扎吊起构件（重物）二钢丝绳的受力及安全系数钢丝绳的受力计算表1-9钢丝绳的容许拉力，可由下式求得：T=c×P/K(N)式中：P——产品规格所保证或试验所得的钢丝绳破断拉力（N），如P采用钢丝破断拉力总和，则须乘“

2、换算系数”；K——钢丝绳的安全系数，可按表1-10采用c—钢丝绳的换算系数钢丝绳的安全系数K表1-10使用情况K值使用情况K值用于缆风绳3.5用作千斤绳，无弯曲时6~7用于手动起重设备4.5用作绑扎的千斤绳8~10用于机动起重设备5~6用于载人的提升机14换算系数c按钢丝绳规格而定：表1-11钢丝绳规格6×19+16×37+16×61+1换算系数c0.850.820.80钢丝绳的钢丝强度，按国家标准（GB1102-74）规定分为五级，即1400、1550、1700、1850和2000（MPa）。对

3、钢丝绳在不同公称抗拉强度时的容许拉力，可按下表换算求得：强度换算系数1400→1550MPa1400→1700a1400→1850MPa1400→2000MPa1.1071.2151.3211.429以上算例系按新绳为准，如所用为旧钢丝绳，则求得的容许拉力应根据绳的新旧程度，乘以0.4~0.75的系数。附表：附表1钢丝绳容许拉力查用表表1-12附表2钢丝绳主要技术规格表1-13附表：1钢丝绳容许拉力查用表表1-126×19+1钢丝绳容许拉力直径（mm）钢丝总断面积（mm2）参考质量(kg/100m

4、)钢丝绳公称抗拉强度为1400MPa时破断拉力（kN）安全系数K在下列数值时的容许拉力（kN）钢丝绳钢丝钢丝破断拉力总和整根绳的破断拉力K=3.5K=5K=8K=106.27.79.311.012.514.015.517.018.520.021.523.024.526.028.031.034.037.040.043.046.00.40.50.60.70.80.91.01.11.21.31.41.51.61.71.82.02.22.42.62.83.014.3222.3732.2243.8557.2

5、772.4989.49108.28128.87151.24175.40201.35229.09258.63289.95357.96433.13515.46604.95701.60805.4113.5321.1430.4541.4454.1268.5084.57102.3121.8142.9165.8190.3216.5244.4274.0338.3409.3487.1571.7653.0761.120.031.345.161.380.1101.0125.0151.5180.0211.5245.52

6、81.5320.5362.0405.5501.0606.0721.5846.5982.01125.017.026.638.352.168.185.8106.3128.8153.0179.8208.6239.3272.4307.7344.7425.9515.1613.3719.5834.7956.34.97.610.914.919.524.530.436.843.751.459.668.477.887.998.5121.7147.2175.2205.6238.5273.23.45.37.710.41

7、3.617.221.325.830.636.041.747.954.561.568.985.2103.0122.7143.9166.9191.32.13.34.86.58.510.713.316.119.122.526.129.934.138.543.153.264.476.789.9104.3119.51.72.73.85.26.88.610.712.915.318.020.923.927.230.834.542.651.561.372.083.595.6续上表6×37+1钢丝绳容许拉力直径（m

8、m）钢丝总断面积（mm2）参考质量(kg/100m)钢丝绳公称抗拉强度为1400MPa时破断拉力（kN）安全系数K在下列数值时的容许拉力（kN）钢丝绳钢丝钢丝破断拉力总和整根绳的破断拉力K=3.5K=5K=8K=108.711.013.015.017.519.521.524.026.028.030.032.534.536.539.043.047.552.056.060.565.00.40.50.60.70.80.91.01.11.21.31.41.51.61.71.82.02.22