提高行车速度以后,日本高崎站内有碴道床的状况明显恶化,调查结果表明,这种现象起因于钢轨焊接接头附近的急剧塌陷。基于修理数量较多,提高作业效率和不打乱钢轨打磨整形车年度等考虑,有关方面作了点式打磨局部维修的尝试,取得了令人满意的效果,钢轨焊接接头的车下噪声值由120dB(A)锐减到105dB(A)。文章认为据此可以定量判断粗糙 After the traffic speed was raised, the condition of the ballast bed in Takasaki Station in Japan deteriorated significantly. The survey results showed that this phenomenon was due to the sharp collapse near the welded joints of the railroad rails. Based on a large number of repairs, improving work efficiency and not disturbing the annualized rail car sharpening vehicle, some attempts have been made to perform spot-sanding local repairs and satisfactory results have been achieved. The noise under rail car- 120dB (A) dropped sharply to 105dB (A). According to the article, we can judge the roughness quantitatively