铁路信号楼搬迁引起的通信系统改造方案探讨

随着铁路的发展,新建、改建铁路不断增多,一些既有铁路信号楼需要搬迁。针对信号楼搬迁引起的通信系统改造方案进行介绍,重点阐述通信系统改造开通前的准备和试验流程。     

Bus Priority Using pre-signals

The need to provide efficient public transport services in urban areas has led to the implementation of bus priority measures in many congested cities. Much interest has recently centred on priority at signal controlled junctions, including the concept of pre-signals, where traffic signals are installed at or near the end of a with-flow bus lane to provide buses with priority access to the downstream junction. Although a number of pre-signals have now been installed in the U.K., particularly in London, there has been very little published research into their design, operation and optimisation. This paper addresses these points through the development of analytical procedures which allow pre-implementation evaluation of specific categories of pre-signals. The paper initially sets out three categories of pre-signal, which have different operating characteristics, different requirements for signalling and different impacts on capacity and delay. Key issues concerning signalling arrangements for these categories are then discussed, together with a summary of the analytical approach adopted and the assumptions required. Equations are developed to allow appropriate signal timings to be calculated for pre-signalised intersections. Further equations are then developed to enable delays to priority and non-priority traffic, with and without pre-signals, to be estimated with delay being taken here as the key performance criterion. The paper concludes with three application examples illustrating how the equations are applied and the impacts of pre-signals in different situations.The analyses confirm the potential benefits of pre-signals, where these signals apply to non-priority traffic only. Where buses are also subject to a pre-signal, it is shown that disbenefits to buses can often occur, unless bus detectors are used to gain priority signalling.     

Innovative strategies for urban car-sharing systems and a simulator to assess their performance

In this paper, three innovative car-sharing systems for urban areas are proposed, based on fleets of individual intelligent vehicles with three service characteristics: instant access, open-ended reservations and one-way trips. These features provide high flexibility but create an uneven distribution of vehicles among stations. Therefore, relocation of vehicles must be performed. Three different system procedures are proposed: in the first system, relocations are performed by users; in the other two, vehicles relocate automatically, thanks to their automation. In the first two systems, vehicles are accessible only at stations, whereas in the third they are also accessible along roads. In order to provide transport managers with a tool to test systems in different realities, an object-oriented simulator is developed. The simulation provides outputs of system performance, in terms of user waiting times and system efficiency. The proposed systems are simulated for the city of Genoa, in Italy, and a comparative analysis is presented.     

京杭运河常州市区段改线工程线路方案论证

介绍了京杭运河常州市区改线段的大改线和小改线2个线路方案走向及优缺点,推荐综合利用程度最高的小改线线路方案。     

临近高压输电线路的同塔并架迁改技术

在铁路电力迁改中经常会有几条待迁改高压输电线路聚集一处,如果能实施同塔并架迁改,将会极大地节约资源。结合新建厦深铁路深圳东站220 kV四回路电力线路同塔并架迁改的实际情况,对同塔并架多回路的经济性和可行性进行了初步分析。     

上海轨道交通6、7、9号线运营控制中心信号设备的搬迁方案

伴随着上海市轨道交通网络运营指挥调度大楼项目的工程可行性研究报告获批,运营控制中心信号设备搬迁方案被提上议事日程。上海轨道交通6、7、9号线均采用上海自仪泰雷兹交通自动化系统有限公司的SelTrac~CBTC信号系统,对6、7、9号线的运营控制中心信号设备搬迁的四种方案及其优缺点进行了分析。     

北京地铁13号线既有线线路改移施工组织分析

既有线线路改移施工是城市轨道交通建设的新课题,需要通过高效的施工组织在确保施工安全、质量的基础上尽可能降低对运营的影响。根据北京地铁13号线清河站既有线线路改移工程,结合现场工程特点,对施工组织进行归纳和总结,从施工流程和方法、施工进度筹划、人员和设备配置以及安全保障措施等方面重点介绍,为城市轨道交通同类型施工提供参考和借鉴。     

铁路调度指挥中心调度通信不中断业务搬迁施工

结合南宁铁路局调度机械室搬迁工程,对调度中心调度通信不中断业务搬迁施工方案进行了阐述。通过组织和实施,既保证了调度电话的正常使用,又完成了搬迁工程施工任务。     

重大交通工程征收拆迁先予执行常态化程序的构建

为了更加高效快速地推进征收拆迁工作,保证诸多重大交通工程顺利建设,应当实行征收拆迁先予执行程序的常态化。基于武汉地铁6号线征收拆迁的实例,分析了征收拆迁先予执行的现实可行性和效率优势,以有效加快拆迁进程,避免工程被搁置、投资被浪费。梳理了现有法律体系,分析先予执行的法律依据,指出先予执行的合法性;同时,深入探讨先予执行没有受到广泛运用的原因是法院的少执行甚至不执行,以及现行法律体系中缺乏先予执行常态化程序的顶层制度设计。提出了重大交通工程征收拆迁先予执行常态化程序的构建对策,从司法理念、受理机制、审理机制、监督机制多方面提出了建议。     

某省道改线公路工程路基工程设计

在对原有公路改线的过程中,应充分利用老路并结合地形、地质条件,提出合理的改线方案,将原有公路提高到要求的技术等级和标准。结合某水电站原有省道改线公路工程,在保证老路交通功能的同时根据电站建设的需要,对老路进行科学合理的路基工程和路基、路面排水设计。