地铁竖井、横通道转入大断面正线隧道施工安全控制技术

Safety Control Technology During the Construction of Subway Main Shaft Cross Channel into Large Cross Section Tunnel

针对城市地铁竖井、横通道转入大断面正洞施工难度大、工序转换繁杂、安全风险高的特点,本文以中国美术馆站站后折返线竖井、横通道转入左、右线正洞施工为例,阐述了竖井、横通道转入大断面正洞时支护框架结构受力转换体系和超前支护加固技术,并通过对沉降监控量测数据分析研判,验证了此种安全控制技术在确保结构自身和周边构筑物安全方面是合理可靠的,可供类似工程参考。

There exist the difficulties during the construction in cities of subway shaft and cross passage into big cross section,the complexity of working procedure conversion and the high risks. Based on these characteristics,special techniques were described with the construction of subway station at National Art Museum of China as an example. These techniques include the stress conversion system of the supporting frame structure and the reinforcing technique of the supporting structure,during the construction subway main shaft cross channel into large cross section tunnel. By analyzing the data from subsidence monitoring,we also assessed the rationales and reliability of these safety control techniques in ensuring the safety of the structures themselves and the surrounding structures,which could provide a reference for similar projects.