A Novel, Low Environmental Impact, Composite Railway Footbridge

一种新颖、低环境影响的复合铁路人行桥。2014年，下议院交通委员会(House of Commons，2014)对平交道口的安全进行了调查，指出2012-13年有9人死于平交道口。该委员会制定了到2020年将这些死亡人数减少到零的目标。2018/19年铁路安全报告(RSSB，2019年)指出，虽然行人死亡人数已减少到两人，但仍有1500多起行人在不安全时横穿马路的事件。在英国，大约有3400个人行横道目前将公众置于危险之中。为纾缓这方面的风险，铁路网建议在可行的情况下安装行人天桥。传统的钢制人行天桥具有坚固的混凝土基础，由于所使用的材料对环境影响很大，因此与Network Rils到2030年实现碳中性的目标相冲突。此外，使用这种传统结构可能会在安装过程中导致网络中断，并对当地环境造成严重的短期破坏，特别是在难以进入的位置。过去，人们已经安装了由纤维增强聚合物形成的桥梁，这些桥梁在一定程度上减少了对环境的影响和破坏，因为它们的重量轻，安装起来更容易。然而，与传统桥梁相比，这些桥梁的价格并不具有竞争力，而且由于包含了一些传统材料，安装时间仍然很长，对环境的影响也很大。在这个项目中，联合公用事业用品(AUS)有限公司将展示一种对环境影响较小的人行桥，这将是第一座完全由纤维增强聚合物部分建造的铁路人行桥，无需现场使用粘合剂或钢制螺栓。桥梁结构将足够轻，可以由聚合物水泥桩支撑，而不是传统的水泥基础。该桥对环境的影响将至少比同等的钢桥低50%。这座桥将比同等的钢桥安装起来容易得多，大大减少了网络中断和对当地环境的破坏。桥梁结构使用了一种创新的方法来连接标准的拉挤纤维增强型材。这种材料和连接方法的选择将使桥梁的价格比同等的钢材具有竞争力，并且比由大模压截面形成的组合桥梁便宜得多。该项目是作为主要合作伙伴的澳航有限公司与哈德斯菲尔德大学、Network Rail、HS2、Fiberline A/S和国家复合材料中心合作完成的。

A Novel, Low Environmental Impact, Composite Railway Footbridge. In 2014, the House of Commons Transport Committee (House of Commons, 2014) investigated safety at level crossings, noting that in 2012-13 nine people had died on level crossings. The committee set Network Rail the target of reducing these fatalities to zero by 2020. The 2018/19 railway safety report (RSSB, 2019) noted that whilst pedestrian fatalities had reduced to two, there were still more than 1500 incidents of pedestrians crossing when it unsafe. In the UK there are approximately 3,400 pedestrian level crossings where members of the public are currently put at risk. To mitigate against this risk, Network Rail propose to install footbridges wherever this is practicable. Traditional steel footbridges with substantial concrete foundations have a high environmental impact due to the materials used and therefore clash with Network Rails target to become carbon neutral by 2030. In addition, using this traditional structure can cause disruption to the network during installation and significant, short term, local environmental damage, particularly in difficult to access locations. In the past, bridges formed from fibre reinforced polymers have been installed and these have reduced the environmental impact and disruption to a degree, as their light weight makes them easier to install. However, these bridges have not been price competitive with traditional bridges and due to the inclusion of some traditional materials, have still had long installation times and a significant environmental impact. In this project Associated Utility Supplies (AUS) Ltd will demonstrate a low environmental impact footbridge which will be the first railway footbridge made entirely from fibre reinforced polymer sections without the use of adhesives onsite or steel bolts. The bridge structure will be light enough to be supported on polymer cement piles rather than traditional cement foundations. The environmental impact of the bridge will be at least 50% lower than the equivalent steel bridge. The bridge will be significantly easier to install than the equivalent steel bridge, greatly reducing network disruption and local environmental damage. The bridge structure makes use of an innovative method of joining standard pultruded fibre reinforced sections. This selection of materials and joining methods will make the bridge price competitive with its steel equivalent and significantly cheaper than composite bridges formed from large moulded sections. The project is a collaboration between AUS Ltd as the lead partner and The University of Huddersfield, Network Rail, HS2, Fiberline A/S and the National Composites Centre.