大口径顶管穿越粉细砂层技术难题及应对措施  

Technical Difficulties and Countermeasures of Large Diameter Pipe Jacking Through Silty Fine Sand Layer

作　　者：蒋平 陈德军 黄意兵 宋晓阳 石瑞瑞 Jiang Ping;Chen Dejun;Huang Yibing;Song Xiaoyang;Shi Ruirui(North China Municipal Engineering Design&Research Institute Co.,Ltd.,Tianjin 300374,China;China Railway Shanghai Engineering Bureau Group Co.,Ltd.,201906,China)

机构地区：[1]中国市政工程华北设计研究总院有限公司,天津300374 [2]中铁上海工程局集团有限公司,201906

出　　处：《特种结构》2024年第1期86-90,共5页Special Structures

摘　　要：本文介绍了某内径4m的钢筋混凝土顶管穿越粉细砂层的工程实例,整个顶管过程中,遇到了顶进机头“磕头”现象、顶进阻力成倍增加和顶进纠偏困难等众多问题,通过重新计算和分析,在顶进过程中通过增加中继间数量和一些减阻措施,并且在机头进洞前采取了加固粉细砂地层的方法,有效地控制了机头的进洞误差,使工程顺利贯通,为相关类似工程提供参考。This paper presents an engineering project where a reinforced concrete pipe with an inner diame-ter of 4m is jacking through a layer of silty fine sand.The pipe jacking process posed numerous challenges,in-cluding the"kowtow"phenomenon of jacking machine head,doubling increase in jacking resistance and diffi-culties in adjusting the jacking direction.Through comprehensive recalculation and analysis,the study shows that the successful completion of the project is ensured by increasing the number of relay rooms,introducing drag reduction measures during the jacking process,and reinforcing the fine sand layer before the machine head entering the tunnel.Those measures effectively controlled the error in the machine head s entry.This engineer-ing study provides valuable references for similar future projects.

关 键 词：钢筋混凝土顶管 粉细砂层 顶进阻力 中继间 减阻措施 

分 类 号：TU74[建筑科学—建筑技术科学]