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关于50AT7号对称三开道岔的平面设计,已在本刊1982年第3期进行过介绍。经过近两年多的试铺运营后,铁道部于1983年4月在杭州组织了技术鉴定会议。会议认为:对称三开道岔采用半割线型曲线尖轨、曲线辙叉、辙后设整铸短轨,是缩短驼峰头部、节省用地、提高编解效率较好的平面形式。通过后端辙叉的安全试验和实际运营考验,证明了后端辙叉的设计是能够保证行车安全的。关于道岔直股的轨距,除转辙器部分外均采用1440mm,对铺设维
On the 50AT7 symmetrical three-turnout of the plane design, has been published in the third issue of 1982, introduced. After nearly two years of trial operation, the Ministry of Railways organized a technical appraisal meeting in Hangzhou in April 1983. The meeting held that the symmetrical three-way turnout adopts the half-cut type curvilinear curve, the curve frog and the short-track for the whole casting after rutting, which is a planar form with shortened hump head, saving land and improving compilation efficiency. Through the back-end frog safety test and actual operation test, we prove that the back frog is designed to ensure traffic safety. Straight rail switch on the gauge, in addition to switch outside the part are used 1440mm, laying dimension