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修复主梁下垂,先在梁中部用千斤顶和立柱将一根主梁顶起;若下垂严重,为防止天车打滑坠落,须将四只大轮暂时固定在天车道轨上。顶起主梁的高度为所需校正量。然后,在主梁中间选择热变形区。可选在主梁的两个侧面和底盖板上,为一底边长约80mm、高度占主梁高度三分之一的等腰三角形,部位在主梁下盖板连接两侧面三角形底边的矩形区域内。(见附图) 将热变形区加热至550℃左右(暗红),冷却时,热变形区产生的收缩内应力与顶起主梁的外力共同作用,可使箱式主梁的下垂得到修复。若结果不理想,可再在另一腹板附近选择同样的热变形区进行修复。修复点选得越少越好。另一主梁用同样方法修复,使两主梁拱度基本相同。
Repair girder drooping, first in the middle of the beam jack and column will be a main beam from the top; if serious droop, in order to prevent Crane skidding crashes, four large wheels to be temporarily fixed on the Crane track. Top of the main beam height required correction. Then select the hot deformation zone in the middle of the main beam. Optional on both sides of the main beam and the bottom cover, is a bottom edge of about 80mm, the height of one third of the height of the main beam isosceles triangle, the lower part of the main beam connecting the two sides of the bottom surface of the triangle Within the rectangular area. (See the attached drawings) will heat the deformation zone heated to about 550 ℃ (dark red), cooling, the deformation of the shrinkage of the internal stress generated by the jacking together with the external force of the main beam, the box girder sag can be repaired . If the result is not satisfactory, you can then select the same hot deformation near the other web to repair. The less repairing point, the better. The other main girder with the same method of repair, so that the two main girders camber basically the same.