CAJ | 학술논문

盾尾密封的完整性和可靠性对于盾构施工安全极其重要。当盾尾刷出现损坏时，要及时进行更换，而进行盾尾刷更换的关键在于地层中地下水的封堵。文章以南京纬三路过江通道N线工程为例，结合高水压强渗透地层盾尾刷更换施工的特点和要求，采用了改进的注浆止水技术。一是通过加强同步注浆，形成第一道止水体系；二是采用增设预留孔的两环特殊管片，对盾尾区域进行止水加固；三是在盾构B环注入聚氨酯形成止水带，防止前方泥水舱泥水后窜。通过采取多道措施形成一个厚度大、密实性高、且具有一定强度的完整止水体系，在无水的环境中成功更换了盾尾刷。
순미밀봉적완정성화가고성대우순구시공안전겁기중요。당순미쇄출현손배시，요급시진행경환，이진행순미쇄경환적관건재우지층중지하수적봉도。문장이남경위삼로과강통도N선공정위례，결합고수압강삼투지층순미쇄경환시공적특점화요구，채용료개진적주장지수기술。일시통과가강동보주장，형성제일도지수체계；이시채용증설예류공적량배특수관편，대순미구역진행지수가고；삼시재순구B배주입취안지형성지수대，방지전방니수창니수후찬。통과채취다도조시형성일개후도대、밀실성고、차구유일정강도적완정지수체계，재무수적배경중성공경환료순미쇄。
The integrity and reliability of shield-tail sealing are very important to the safety of shield tunnelling, and tail-seal brushes need to be replaced quickly in case of any damage; therefore the sealing of underground water is key to success in these cases. Taking line N of the Nanjing Weisan Road river-crossing project as an example, and considering the characteristics and requirements of replacing a tail-seal brush in a strong, permeable strata with high water pressure, an improved grouting technique was adopted for stopping water: 1) the primary water-stopping system was formed by strengthening the synchronous grouting; 2) the shield-tail part was consolidated by grouting via two special segments with additional reserved holes; and 3) the B-ring of the shield was grouted with polyurethane to avoid leakage from the front of the slurry chamber. Using this method, a complete water-sealing system characterized by its thickness, high density and strength is formed, ensuring successful replacement of the tail-seal brushes in a dry environent.