近 1年多来 ,丰台车辆段列检发现下心盘螺栓折断故障越来越多。从 2 0 0 1年 1月— 5月的统计来看 ,约占站修临修车的 2 0 %～ 30 % (见表 1)。从车型看 ,棚车占扣修的 6 0 %以上。每个转向架螺栓折断数 ,少则三四条 ,多则五六条。列检处理时 ,折断一两条的 ,一般不处理 ;折断? Over the past year or so, Fengtai depot found that more and more heart failure bolt failure. From the statistics of January-May 2001, it accounts for about 20% -30% of the repaired vehicles (see Table 1). From the model point of view, box cars account for over 60% of deductions. Each bogie bolt breakage, as few as 34, as many as 56. Disposal processing, broken one or two, generally do not handle; broken?