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近年来,我国在隧道内修建了不少整体道床,在车站、货场、港口、工矿企业特别是石油、煤炭、钢铁等专用线上也修建了若干不同类型的整体道床。但却尚未有专为整体道床设计的理想扣件,在一般情况下仍采用混凝土轨枕用的不分开式扣件:70型扣板式或67型拱形弹片式扣件。而这两种扣件基本上不能调高,无法解决整体道床上曲线超高及施工条件限制下所产生的误差等。为此从1973年起,由铁道部专业设计院标准处设计、试铺一种可供调高
In recent years, many integral road beds have been built in the tunnels in our country. A number of different types of integral ballast beds have also been constructed at stations, freight yards, ports, industrial and mining enterprises, especially the special lines such as oil, coal and steel. However, there are no ideal fasteners specifically designed for the whole track bed. In general, non-split fasteners for concrete sleepers are also used: a 70-type buckle-plate or a 67-type arch-type clasp. These two kinds of fasteners basically can not be raised, unable to solve the overall curve of the bed bed and construction conditions under the conditions of ultra-high error. To this end from 1973 onwards, by the Ministry of Railways Professional Design Institute standard design, test shop for a raised