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| Study and Application of New Symmetrical Three—way Turnout for Urban Rail Transit |
| MA Zhen—hai，YU Chun—hua |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 300142，China |
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Abstract 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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Received: 30 August 2010
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2010, Vol. 27 
