污染地层泥水平衡盾构施工关键技术

Key Construction Technology of Slurry Balance Shield in Pollutant Stratum

以北京地铁7号线08标百子湾站—化工路站区间隧道穿越污染地层为工程背景,根据土层和地下水污染情况,基于泥水平衡盾构施工的特点,对现有泥水平衡盾构进行了创新性改造,采用加强型盾尾刷、卡箍式泥水管路连接方式,在隧道内布置有害气体吸附装置和监测仪,增强了盾构在污染地层中的适应性。并在施工过程中及时进行二次补浆、采用改良装置封闭洞门和加强洞内通风等施工措施,有效避免施工人员接触污染物,确保了人员安全。

Based on the interval tunnel between Baiziwan and Huagong Road in Beijing Metro Line 7 Lot8,according to soil and groundwater pollution conditions,based on the characteristics of slurry balance shield construction,the authors creatively transformed existing slurry balance shield,adopted enhanced shield tail brush and the connection mode of clamp slurry pipeline,and fixed absorption device of harmful gas and monitoring instrument in tunnels,which strengthened the adaptability of shields in pollutant stratum. And during construction,the methods of making the second fill pulp timely,adopting improved device closure portal and strengthening tunnel ventilation,effectively avoided the workers to touch pollutions,ensured construction safety.