摘要
盾尾油脂孔的不合理布设易导致间距过大处尾刷磨损严重,出现固定渗漏点,严重威胁盾构施工安全。为了弥补这一缺陷,以福州地铁滨海快线大数据站-滨海新城站区间工程为依托,首先对盾尾改造原因、改造前注浆止水加固工作进行了详细说明。其次从风险、工期、成本3个方面对不同盾尾原位改造方案进行对比分析,结果表明通过设计一块特制尾刷并与外置槽钢焊接明显优于其他几类方案。通过上述措施,成功在无水环境中安全且高效地完成了盾尾改造,新增油脂孔可正常泵送油脂至腔内,极大保障了后续施工安全。相关经验可为后续类似工程提供参考。
The unreasonable arrangement of grease holes at the shielded tail is easily to cause serious wearing of the tail brush at areas with too large spacing,resulting in fixed slurry leakage locations,which might seriously threaten the safety of shielded tunnel construction.To mitigate for this defect,a construction project case history between the Big Data Station and the Binhai-Xincheng Station in Fuzhou Metro Nearshore Express Line is presented in this paper.Firstly,reasons for the shielded tail improvement as well as the water stop grouting reinforcement before the improvement are introduced in detail.Secondly,different shielded tail on-site improvement alternates are compared from risk,construction duration and cost aspects.The result shows that the alternate of designing a special tail brush and welding with the external hot rolled steel is obviously better than other options.Through the above measures,the shielded tail on-site improvement is successfully completed in a safe and efficient manner under a no-water condition.The new grease holes can normally pump grease into the cavity,greatly improve the safety of the subsequent construction.The relevant experience learned in this project can provide a reference for the subsequent similar projects.
作者
张维
夏晓谦
陈少林
孙恒
黄新淼
ZHANG Wei;XIA Xiaoqian;CHEN Shaolin;SUN Heng;HUANG Xinmiao(CCCC SHEC Third Engineering Co.,Ltd.,Zhenjiang 212000;CCCC SHEC(Chengdu)Urban Construction Engineering Co.,Ltd.,Chengdu 610218;CCCC Second Harbor Engineering Company Ltd.,Wuhan 430040)
出处
《土工基础》
2024年第2期178-180,191,共4页
Soil Engineering and Foundation
关键词
盾尾改造
特制尾刷
富水粉细砂层
注浆法
Improvement of Shielded Tail
Special Tail Brush
Water-Rich Sand Strata
Grouting Method
