铁路隧道内接触网预埋槽道标准的优化探讨

Optimization Discussion of Anchor Channel Standard for Overhead Contact Line in Railway Tunnel

研究目的:铁路隧道内接触网预埋槽道在其设计使用年限、碳钢槽道防腐处理方式等方面存在较大争议,导致《电气化铁路接触网隧道内预埋槽道》TB/T 3329—2013执行困难。本文通过国内外铁路相关标准要求的调查研究和技术分析,并对热浸镀锌、共渗钝化封闭复合防腐(PCA)、热浸镀锌+表面涂层三种防腐方案从铁路标准支持、检验试验通过、工程应用情况、环境保护节能和防腐生产成本等方面进行综合对比,找出解决方案。研究结论:(1)槽道设计使用年限与环境腐蚀等级有关,与槽道防腐层的耐腐性能没有直接定量的换算关系;(2)槽道设计使用年限应满足接触网系统运营部门对预埋槽道的设计寿命要求,或按照隧道接触网重要性等级划分为30年、50年、100年3个档次供具体工程建设项目选用;(3)热浸镀锌、PCA、热浸镀锌+表面涂层三种防腐方案综合对比,PCA方案最优;(4)建议在TB/T 3329—2013标准中增加PCA防腐处理工艺,以满足工程需求;(5)该研究成果可为TB/T 3329—2013标准修订、铁路隧道内接触网预埋槽道的设计、制造和运维提供参考。

Research purposes: There are great disputes on the design service life and anti-corrosion treatment method of carbon steel channel of OCS anchor channel in railway tunnel, which makes it difficult to implement Anchor Channel for Overhead Contact System in Electrified Railway TB/T 3329—2013. Through the investigation and technical analysis of the requirements of relevant railway standards at home and abroad, this paper comprehensively compares the three anti-corrosion schemes of hot-dip galvanizing, co-permeating-passivating-coating anticorrosion(PCA), hot dip galvanizing + surface coating from railway standard support, inspection test pass, engineering application, environmental protection, energy conservation and anti-corrosion production cost, and finds out the solutions. Research conclusions:(1) The design service life of the channel is related to the environmental corrosion grade, and there is no direct quantitative conversion relationship with the corrosion resistance of the channel anti-corrosion coating.(2) The designed service life of the channel shall meet the design life requirements of the OCS system operation department for the channel, or it shall be divided into three grades of 30 years, 50 years and 100 years according to the importance grade of the tunnel OCS for selection of specific engineering construction projects.(3) The comprehensive comparison of three anti-corrosion schemes of hot-dip galvanizing, PCA and hot-dip galvanizing + surface coating shows that PCA scheme is the best.(4) PCA anti-corrosion treatment process is added to TB/T 3329—2013 standard to meet the engineering requirements.(5) The research results can provide reference for the revision of TB/T 3329—2013 standard and the design, manufacture, operation and maintenance of OCS anchor channel in railway tunnel.