长沙磁浮东延线接入T3航站楼工程是国内首个磁浮盾构隧道工程，也是目前世界最长磁悬浮隧道工程。为科学、合理制定隧道工程断面尺寸，保障磁浮列车安全平稳运行，对长沙磁浮东延线接入T3航站楼工程限界进行了深入研究。参照《地铁限界标准》，结合磁悬浮车辆结构特点，对车辆限界、设备限界以及盾构区间建筑限界、明挖区间建筑限界、地下车站建筑限界等几种典型建筑限界进行了研究，并给出了详尽的典型地段建筑限界图。研究表明：采用盾构内径为6.1m的隧道能够满足隧道阻塞比及磁浮列车安全平稳运行要求，并具有一定的经济性。长沙磁浮东延线接入T3航站楼工程已开工建设，建筑限界设计安全、经济、合理，为后续磁浮隧道工程建设提供参考。

The Changsha Maglev East Extension Line connecting to the T3 terminal is the first maglev shield tunnel project in China and the longest maglev tunnel project in the world. In order to scientifically and reasonably formulate the section size of the tunnel project and ensure the safe and stable operation of the maglev train, an in-depth study was conducted on the gauge of the Changsha Maglev East Extension Line connecting to the T3 terminal.Referring to the "Standards of Metro Gauges" and considering the structural characteristics of maglev vehicles, several typical building gauges such as vehicle gauges, equipment gauges, shield tunnel construction gauges, open cut construction gauges, and underground station construction gauges have been studied，detailed structure gauge charts of typical sections are presented. Research shows that the use of a shield tunnel with an inner diameter of 6.1m can meet the train-tunnel dimension ratio and the safe and stable operation of maglev trains, and has certain economic efficiency.The Changsha Maglev East Extension Line connecting to the T3 terminal project has started construction,and the design of the building boundary is safe，economical and reasonable, which provides a reference for the subsequent construction of the maglev tunnel project.