CAJ | 학술논문

南京地铁3号线某中间风井超深基坑，地下连续墙深44?2m，嵌入中风化硬岩达10～13m，介绍了超深基坑大深度入岩地下连续墙的关键施工技术。施工实践表明，冲抓结合法有效解决了大深度入岩地下连续墙成槽问题；钢筋笼采用一次制作成型、分段吊装空中连接降低了吊装难度和风险；水泥土搅拌桩加固较厚软弱土层防止槽壁长时间暴露坍孔问题；刚性止水接头加焊止浆板防止混凝土绕流等措施，结果表明墙体质量、垂直度和止水效果均满足设计要求，保证了超深基坑的安全顺利开挖。
남경지철3호선모중간풍정초심기갱，지하련속장심44?2m，감입중풍화경암체10～13m，개소료초심기갱대심도입암지하련속장적관건시공기술。시공실천표명，충조결합법유효해결료대심도입암지하련속장성조문제；강근롱채용일차제작성형、분단조장공중련접강저료조장난도화풍험；수니토교반장가고교후연약토층방지조벽장시간폭로담공문제；강성지수접두가한지장판방지혼응토요류등조시，결과표명장체질량、수직도화지수효과균만족설계요구，보증료초심기갱적안전순리개알。
For the ultra-deep foundation excavation of one middle shaft of Nanjing Metro Line 3 , the depth of diaphragm wall is 44?2m, which embeds the weathered hard rock in 10~13m, this paper introduces the key construction technology for large depth rock entering diaphragm wall of ultra-deep foundation excavation. Engineering practice shows that drill-grab combination can solve the trenching of large depth rock entering diaphragm wall effectively; the steel reinforcement cage is once-for-all formed, segment hoisted thus reduces the hoisting difficulty and risk; cement mixing pile strengthening the thick soft soil layer prevents the hole collapse due to long time exposure of slot wall;the rigid water stopping joint with weld pulp board can prevent burble by concrete. The results show that the quality, verticality and water stopping of the wall meet the design requirement, and ensure smooth excavation of ultra-deep foundation excavation.