研究目的：城市轨道交通工程(本文主要指地铁)停车线两端与正线连接时，一般采用单开道岔，这对缩短车站长度，减小施工难度不利。因此，研发出适合于城市轨道交通工程特点的特殊道岔，包括对称三开道岔和对称道岔两种类型。本文以对称三开道岔为例加以阐述。
研究结论：经过研究论证，对称三开道岔设计参数选用合理，结构强度可靠，符合轨道交通工程运营特点。对称三开道岔不仅安全可靠，而且可有效缩短有停车线车站的开挖长度，对节省工程投资、降低工程风险、减少施工难度极为有利。可在城市轨道交通工程中推广应用。
Research purposes: The simple turnout is used generally when the both ends of stabling siding of urban rail transit(mainly refers to metro in this paper)connect with the main track，but it is unhelpful for shortening the excavation length of station and reducing the constructing difficulty．Therefore，the special turnouts available for urban rail transit have been developed，including symmetrical three—way turnout and symmetrical turnout．In this paper，the introduction is given to the symmetrical three—way turnout．
Research conclusions: The research shows that the symmetrical three—way turnout is available for urban rail transit with rational design parameters and reliable structural strength．The symmetrical three—way turnout is not only safe and reliable．but also can effectively shorten the excavation length of the subway station访tIl stabling siding and is helpful for saving construction investment，debasing project risks and reducing the construction difficulty．So the symmetrical three—way turnout Can be applied widely in urban rail transit．
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