中关村地下通道暗挖段超前支护施工技术

以北京地铁4号线中关村站与中关村西区地下通道工程暗挖段施工为例,介绍了复杂地质条件下暗挖段超前支护施工技术。该工程通过采取大管棚结合小导管注浆超前支护加固地层,并与初期支护形成棚架结构体系,共同承受管棚上部荷载,从而有效地保障了复杂地质条件下暗挖段的施工质量。

Forepoling Construction Technology in Concealed Section in the Zhongguancun Underground Passage Project

Based on concealed section construction in underground passage project in Beijing subway Line 4 Zhongguancun station to Zhongguancun west district, forepoling construction technology in concealed section under complex geological condition is introduced. The project adopted big pipe roofing and small pipe slip casting forepoling to strenghthen the stratum, it bears the load together with the poling in initial stage forming a scaffold structure, which effectively assured the concealed digging section construction quality under complex geological condition.