半接入式方向别疏解方案研究
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摘要
研究目的:当受既有车站站型、周边地形等因素受控时,传统方向别疏解方案易出现纵坡超限、补机困难、施工难度大、造价高等难题。本文拟根据各引入线路车流内在特征及相互关系,突破传统,探讨新的方向别疏解方案。研究结论:(1)进出站线路疏解方案影响因素主要有:引入线路的数量和位置、正线数目和通过能力、客货流走向及其特点、站型特点及其配置形式;(2)传统方向别疏解方案设计方案主要分为:通过车为主、跨线车为主和混合流三大类型,其各方向车流径路较为灵活,但在站坪长度及地形受限时,疏解较为困难;(3)半接入式方向别疏解方案主要特点为引入线路可仅与车站一端咽喉相接,可分为Ⅰ、Ⅱ、Ⅲ、Ⅳ四个象限基础方案,其余方案可以在此基础上进行拓展;(4)与传统方向别疏解方案相比,半接入式方向别疏解方案具有为疏解争取抬高或降低标高争取有利条件、工程代价低、施工难度小等特点,特别适用于疏解坡受限、车流主次明显,部分车流采用固定行车路径的情况。
Research purposes: The traditional untwining scheme easily causes transfinite slope, helper engine difficulty,difficult construction,high cost and so on. This paper investigates a creative untwining scheme through analyzing the feature and interrelation of traffic.Research conclusions:(1) The factors of untwining scheme mainly include: number and location of the introduction line,number of positive lines and carrying capacity,trend and characteristics of passenger and cargo flow,features and configurations of station.(2)The traditional untwining scheme can be divided into three types which are mainly passing flow,crossing flow and mixing flow. The dividing pathways are flexible,but the untwining is difficult with restricted length of station and topography.(3) The main features of half access type untwining scheme is joining with one of the station throat,it can be divided into four fundamental types in I、II、III、IV quadrant,and the others can be expanded based on the fundamental type.(4) The half access type untwining scheme has the characteristic of fighting favorable conditions for raising or lowering the elevation,lower project costs,lower construction difficulty contrast to the traditional untwining scheme. It can be especially applicable with limited slope,significant traffic and part of the flow having fixed path.
Research purposes: The traditional untwining scheme easily causes transfinite slope, helper engine difficulty,difficult construction,high cost and so on. This paper investigates a creative untwining scheme through analyzing the feature and interrelation of traffic.Research conclusions:(1) The factors of untwining scheme mainly include: number and location of the introduction line,number of positive lines and carrying capacity,trend and characteristics of passenger and cargo flow,features and configurations of station.(2)The traditional untwining scheme can be divided into three types which are mainly passing flow,crossing flow and mixing flow. The dividing pathways are flexible,but the untwining is difficult with restricted length of station and topography.(3) The main features of half access type untwining scheme is joining with one of the station throat,it can be divided into four fundamental types in I、II、III、IV quadrant,and the others can be expanded based on the fundamental type.(4) The half access type untwining scheme has the characteristic of fighting favorable conditions for raising or lowering the elevation,lower project costs,lower construction difficulty contrast to the traditional untwining scheme. It can be especially applicable with limited slope,significant traffic and part of the flow having fixed path.
引文
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