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在旧有站場的改建、扩建中,为了避免增加工程,或由于地位狹窄,而在运营上又一定需要时,在次要站綫上,二綫路相交叉的菱形道岔的鋪設就成为必需的了。菱形道岔結构比較特殊,一般对鋼軌组合結构的过岔速度,不得超过20公里/小时。但这对于車場調車作业来說,影响还是很大。所以,在一定場合和条件下,还是有使用价值的。菱形道岔的布置,一般都是直綫与直綫相交叉。这种設計是比較簡单的。但是在旧站內,并不一定具有这样的条件,而会遇到曲綫与曲綫相交叉的情况。这时,如果一定要按直綫菱形交叉設計,就必须将原有綫路的曲綫分割出一段直綫来,以便鋪設交叉。因而引起原有曲綫必须分割为二,并要将其半径减小等一系列問題。
In the reconstruction and expansion of the old station yard, in order to avoid additional works or because of its narrow position and necessary operation in operation, the laying of a diamond-shaped switch crossing the second line is necessary on the secondary station line It’s The structure of diamond-shaped turnout is rather special. Generally, the crossing speed of the rail-combined structure should not exceed 20 km / h. But for shunting operations at the yard, the impact is still great. Therefore, under certain circumstances and conditions, there is still value for use. The layout of diamond-shaped switches, usually straight and straight lines intersect. This design is relatively simple. However, in the old station, not necessarily have such conditions, but will encounter the curve and the curve intersect. At this time, if we must follow the linear diamond cross design, it must be the original line of the curve is divided into a straight line to facilitate the laying of cross. Thus causing the original curve must be divided into two, and to reduce its radius and a series of problems.