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上海铸管厂铸工车间的10t桥式起重机,跨度为16.5m,使用已超过廿年。其箱形主梁在卸荷时有严重下挠和旁弯,但主梁受负荷后所增加的下挠,在卸荷后仍能恢复弹性变形。针对这种情况,采用就地起吊的火焰矫正法,修复了主梁的下挠和旁弯,取得了修复迅速、占地较少的效果。现介绍修复的经过。一、修复前的主梁测试结果1.起吊时挠度先对起重机按规定进行静负荷试验。起重量为11t,超负荷10％,起吊两次,每次吊重时间为10分钟。起吊时,主梁中间处的最大挠度为-14mm,卸荷后挠度恢复到一定值。
Casting plant in Shanghai Casting Workshop 10t overhead crane, span of 16.5m, the use of more than 20 years. The box girder has serious downward deflection and side bending when it is unloaded, but the lower torsion increased by the load of the main beam can still recover the elastic deformation after unloading. In view of this situation, the use of local lifting flame correction method to repair the main beam of the next deflection and side bends, achieved rapid repair, covering less effect. Now introduced after the repair. First, before the repair of the main beam test results 1 deflection when lifting cranes according to the provisions of static load test. Lifting capacity of 11t, overload 10%, lifting twice, each lifting time of 10 minutes. Lifting, the maximum deflection at the middle of the main girder -14mm, after unloading deflection back to a certain value.