高速铁路大直径盾构隧道预埋槽道精准定位研究与应用  

Research and Application of Precise Positioning for Embedded Channels in Large-Diameter Shield Tunnels of High-speed Railways

作　　者：段忠辉 孟庆余 DUAN Zhonghui;MENG Qingyu(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道标准设计》2024年第12期115-122,共8页Railway Standard Design

基　　金：中国铁路设计集团有限公司科技开发课题(2021B240619);中国国家铁路集团有限公司科技研究开发计划课题(K2020G033)。

摘　　要：目前盾构管片预埋槽道技术已经应用在地铁隧道中,且取得了良好的经济效益,但在高速铁路盾构隧道中尚无应用先例,主要是由于高速铁路隧道内线网悬挂要求严格,槽道仅供接触网使用,全环预埋槽道利用率低,造成浪费较大。研究高铁盾构隧道预埋槽道精准定位与安装,以充分利用预埋槽道改善现场施工和后期运营维护,具有十分重要的意义。依托广湛高铁湛江湾海底隧道工程,通过前期技术方案研究,对接触网锚段关节悬挂和接触悬挂型式进行精简统一,根据接触网的不同需求确定相应类型的槽道长度和预埋槽道管片组合形式,并提出能够满足要求的拼装点位和对应的槽道管片块以及推荐拼装点位。通过现场拼装试验和专家论证,实现了单块预埋槽道管片的接触网一般悬挂,以及连续多环局部预埋槽道管片的中心锚结下锚和悬挂下锚的精准定位拼装,成功验证了高铁大直径盾构隧道局部预埋槽道精准定位拼装的可行性,并在全隧7.55 km盾构段进行应用。根据拼装结果统计,不同类型预埋槽道管片均按设计点位及要求拼装到位,拼装合格率100%,能够满足接触网使用和相关规范等要求。At present,the technology of embedded channels in shield tunnel segments has been applied in subway tunnels,achieving significant economic benefits.However,it has not yet been implemented in high-speed railway shield tunnels,mainly because of the strict requirements of the overhead contact system,where the embedded channel is intended solely for the contact network.The low utilization of full-ring embedded channels leads to considerable waste.This study focuses on the precise positioning and installation of embedded channels in high-speed railway shield tunnels,aiming to optimize the use of embedded channels,improve on-site construction,and enhance subsequent operation and maintenance.The research is of considerable importance.Based on the Zhanjiang Bay Submarine Tunnel Project of the Guangzhou-Zhanjiang High-speed Railway,a comprehensive technical analysis was conducted.Simplifications and standardization of the contact network anchor segment joints and suspension types were carried out.The appropriate embedded channel lengths and segment combinations were determined according to the different needs of the contact network.Assembly points and corresponding channel segment blocks that met the requirements were proposed,along with recommended assembly points.Through on-site assembly tests and expert reviews,the general suspension of individual embedded channel segments for the contact network,as well as the precise positioning and assembly of locally embedded channel segments in multiple rings for center anchoring and anchoring,and suspension anchor,were successfully validated.The feasibility of precise positioning and assembly of locally embedded channels in large-diameter shield tunnels for high-speed railways was verified.This approach was applied in the 7.55 km shield section of the entire tunnel.According to the assembly results,different types of embedded channel segments were assembled to the specified design positions,achieving a 100%assembly pass rate,and fulfilling the requirements of the contact network

关 键 词：高速铁路 大直径盾构隧道 预埋槽道 精准定位 接触网基础 拼装点位 

分 类 号：U225[交通运输工程—道路与铁道工程] U238