文章针对北京地铁十四号线大盾构区间施工超前，盾构接收车站工期显著滞后的情况，提出了盾构先就位、后施工围护结构、大盾构在车站围护阶段吊出的施工方法。通过对盾构及其管片的受力机理及土层稳定理论进行研究分析，采用了土体注浆加固及管片内架设临时支撑的方法，并进行了周边环境变化的监测。结果表明，在接收车站无法满足盾构吊出条件时，该施工方法可减少车站施工工期滞后对区间隧道施工的制约，具有广阔的应用前景和重大的社会经济效益。%Based on the situation of Beijing metro line 14, where the construction of the receiving station for the shield machine lagged behind the construction of the shield-bored tunnel, a new construction method is proposed in which the shield machine is placed before the construction of the retaining structure and is later hoisted out during construction of the station's retaining structure. With a focus on the stress mechanism of the shield machine and its segments as well as the soil stability theory, a method of soil-mass grouting reinforcement and temporary support inside the segments was adopted, and the surrounding environment was monitored. The results show that when the conditions of the receiving station cannot satisfy the requirements for hoisting out the shield machine, this method can mitigate the constraints of lagged station construction and has significant social and economic benefits, thereby providing a broad basis for future application.
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