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地铁CBD线拟设八座车站 今年开工2021年建成

2017-04-27 07:19:06   北京日报

穿插于CBD高楼大厦间的地铁28号线迎来升级。昨天,中国铁道科学研究院公布了地铁28号线(也就是CBD线)的二次环评公告。对比此前相关部门所披露的信息,CBD线已由原来的“地下小火车”APM线改为更大运量的“直线电机”线,列车容量上也能扩充为6辆编组。根据计划,CBD线预计今年开工建设,2021年建成。

车站密度大于其他线路

从现在北京地铁规划和运营版图来看,28号线已经是最大编号的线路。但这条线路目前披露的长度并不算长,只有6.46公里,设站8座,车站密度远大于其他地铁。也就是说,未来列车每跑七八百米就有一座车站。

车站如此密集是因为这条地铁线的重要程度。地铁28号线此前被称为“CBD线”,顾名思义,这条线路将更多服务CBD区域内部。环评简本披露,该工程是中心城东部的区域加密对角线,其功能定位主要是为解决CBD区域出行问题,完善轨道交通线网结构,弥补中心城东部“井”字形轨道交通线网的不足。

规划示意图显示,本工程全部位于朝阳区。线路由东大桥至大郊亭,起点位于工体南路路口,沿朝阳门外大街、朝阳路向东敷设,过东三环后,在针织路转向南,经过CBD核心区、建国路,下穿通惠河后,转向东衔接北京东站,出站后向南转向东四环路,沿东四环西侧绿化带向南接入大郊亭站。

列车类似机场快轨

发生改变的不仅仅是终点站,CBD线的整体技术都发生了变化。

在此前的规划中,CBD线曾考虑APM线的方案,也被称为是自动捷运系统。在首都机场T3航站楼,往返国际区与国内区之间的“小火车”就是APM线。这种轨道交通系统的车辆采用橡胶车轮,依靠导向轨引导方向,在两条平行的平板轨道上运行,被定义为新型快速客运交通。

不过,记者在昨天披露的环评简本中看到,CBD线的列车类型已改为“直线电机”。在北京轨道交通建设中,2008年开通的机场快轨首度尝试该技术。

“区别于普通地铁列车,直线电机列车的转弯半径小、爬坡能力强,非常适合CBD区域地下空间的穿梭。”北京地铁规划人士向记者解释。

从APM线变为直线电机线,另一个不同则是运量的提升:由4辆编组改为6辆编组。该人士说,CBD线相比以前方案有所延长,并衔接北京东站,因此设计能力也有所提升。

东大桥站将“三线换乘”

环评简本也透露,CBD线将在今年开工建设,2021年建成。

CBD线的最高设计时速将达到80公里。建成后,CBD线将与多条轨道交通线路实现换乘。从目前披露的规划示意图上看,该线8座车站中有3座换乘车站。其中,已经运营的车站包括两个:在东大桥站可换乘地铁6号线,在大郊亭站可换乘地铁7号线。

值得一提的是,正在开工的地铁17号线也将在东大桥设站,17号线有望在2020年开通,这也就意味着未来CBD线开通后,东大桥站将实现“三线换乘”。

责任编辑:任冲 CN062
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