摘要
土压平衡盾构机在富水漂卵石地层中掘进存在刀盘刀具磨损严重,螺旋机轴易卡停断裂,渣土易离析喷涌,推进效率低下等问题。以成都轨道交通6号线工程为依托,采用刀盘刀具适应性改造,螺旋机耐磨技术改造,泡沫膨润土混合液渣土改良,“超前排渣、扭矩控制、泡沫动平衡”等措施。经实践,刀具的更换里程明显延长,可达到全区间1082 m不换刀连续推进;螺旋机发生断轴后,修复时间由10 d缩短为3 d;采用混合注入的渣土改良方式,将刀盘扭矩降低了31%,螺旋机扭矩降低了49%,有效减少了卡停和喷涌情况;采用的掘进技术明显提高了施工进度,减少了停机风险。研究结果表明,采用的技术措施解决了土压平衡盾构机在此种地层中的施工难题,提高了施工效率,降低了工程风险。
During the excavation of water-rich boulders stratum,the earth pressure balance shield machine has problems including serious wear of cutter head and cutters,high probability of stop and break of screw shaft,segregation and gushing of muck,difficult propulsion and low efficiency.Based on the project of Chengdu subway line 6,measures such as the transformation of cutterhead and cutter,the wear-resistant transformation of screw machine,the improvement of foam bentonite mixture residue were adopted in the concept of that advanced slag discharge,torque control,foam dynamic balance.Application indicates that,the replacement mileage of the cutters is obviously extended,which can reach 1082m without changing the cutters.The repair time is shortened from 10 days to 3 days when the screw machine breaks.The torque of the cutterhead is reduced by 31%,and the torque of the screw machine is reduced by 49%,which effectively reduces the stuck and gushing.The tunneling technology suggested significantly improves the construction progress and reduces the risk of shutdown.The research results show that,the technical measures adopted solve the construction problems of earth pressure balance shield machine in the stratum,and the construction efficiency could be improved and the engineering risk could be reduced.
作者
张广鹏
ZHANG Guangpeng(China Railway 16th Bureau Group Co.,Ltd.,Beijing 100018,China)
出处
《铁道勘察》
2023年第3期138-143,共6页
Railway Investigation and Surveying
基金
中铁十六局集团有限公司科技研究开发计划项目(K2018-25B)。
关键词
城市轨道交通
富水漂卵石
盾构法
大粒径
刀盘刀具
螺旋机
渣土改良
urban rail transit
water-rich boulders
shield mothod
large particle size
cutter head and cutters
screw machine
slag improvement
driving technique
作者简介
张广鹏(1983-),男,2006年毕业于山东大学土木工程专业,工学学士,高级工程师,E-mail:zgp.5277@163.com。
