特殊工况下盾构机出井吊装施工技术研究

Research on shaft hoisting construction technology of shield machine under special working conditions

为了解决在特殊情况下进行管片外径为8.8 m的盾构机接收、拆解和吊装作业问题,结合施工现场实际情况,对特殊工况下盾构机吊装出井技术措施进行研究。首先对吊装过程中最不利因素进行分析,其次提出了在结构未完全完成工况下盾构机吊装解决方案,同时进行了有、无措施的吊装作业对现有不完整井结构变形影响的数值模拟分析,并分析了在有措施的工况下吊车支腿地基承载力及基坑侧压力,最终提出了在接收井结构不完整情况下盾构机接收、拆解、吊装出井及施工监测的技术措施。结果表明:实际工程应用中,所提盾构机出井吊装施工技术措施可行可靠;有限元分析结果与实际监测变形规律基本一致,变形可控。研究结果丰富了特殊工况下盾构机吊装作业的施工技术,可为类似情况下的隧道工程吊装作业提供借鉴。

In order to solve the problem of receiving,disassembling,and hoisting shield tunneling machines with an outer diameter of 8.8 meters under special circumstances,combined with the actual situation of the construction site,the technical measures for shaft hoisting of the shield tunneling machine under special working conditions were studied.Firstly,the most unfavorable factors during the lifting process were analyzed.Secondly,a solution for shield tunneling machine hoisting was proposed under the condition of incomplete structural completion.At the same time,numerical simulation analysis was conducted on the impact of hoisting operations with and without measures on the deformation of the existing incomplete well structure.The bearing capacity of the crane leg foundation and the lateral pressure of the foundation pit were analyzed under the conditions of measures.Finally,technical measures were proposed for the shield tunneling machine receiving,dismantling,hoisting and construction monitoring in the case of incomplete reception well structures.The results indicate that in practical engineering applications,the proposed technical measures for shaft hoisting of the shield tunneling machine are feasible and reliable;The finite element analysis results are basically consistent with the actual monitoring deformation laws,and the deformation is controllable.The research results have enriched the construction technology of shield tunneling machine hoisting operation under special working conditions,and can provide reference for similar hoisting operations in tunnel engineering.