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桥式吊车主梁技术要求两根主梁组焊成桥架后,应具有上挠拱度L/1000(L为桥式吊车跨度)。获得上挠拱度采用的方法是在下料时,预先使两腹板具有大于L/1000的上挠拱度值,但由于主梁装配、焊接等因素影响,焊后产生变形,主梁上挠拱度往往保证不了L/1000的要求。因此,采用了火焰与机械矫形相结合的方法。具体做法如下: ①先将主梁放在平台上并垫起来,测量主梁各隔板位置上挠情况,把测量数值用粉笔记在相应位置上。
Bridge crane girder technical requirements of the two main beam group welded into the bridge, the arch should have on the arch L / 1000 (L is the bridge crane span). The method of obtaining the degree of upper camber is to make the two webs have an upper camber value greater than L / 1000 at the time of blanking, but due to the influence of main beam assembly and welding, Cambers often can not guarantee the requirements of L / 1000. Therefore, using a combination of flame and mechanical orthopedic method. Specific practices are as follows: ① The first beam on the platform and pad up to measure the main beam of each partition on the flexible situation, the measured value of the chalk note in the appropriate location.