美兰机场排水工程的多孔小间距顶管施工关键技术  

Key Technology of Multi-hole and Small-spacing Pipe Jacking Construction in Meilan Airport Drainage Project

作　　者：贾凯[1] 武永新[1] 徐振博 JIA Kai;WU Yong-xin;XU Zhen-bo(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《中国给水排水》2021年第22期113-117,共5页China Water & Wastewater

摘　　要：以海口市美兰机场二期扩建场外排水工程为例,介绍了多孔小间距顶管施工技术。施工前期,采用数值模拟手段对多孔顶管施工顺序进行了优化分析,得出三孔和四孔顶管分别采用1-3-2和1-3-2-4的施工顺序时,可有效减少施工对地面的影响。同时总结了顶管施工的中继环布设、减阻泥浆注浆工艺等施工要点。针对顶管施工过程中遇到的顶管出洞发生渗水、管内渗漏及顶管遇巨大孤石等问题,给出了工程所采取的处理方法。通过采用上述关键施工技术,该工程取得了良好的施工效果。Taking the phaseⅡexpansion off-site drainage project in Haikou Meilan Airport as an example,the construction technology of multi-hole and small-spacing pipe jacking is introduced.In the early stage,the construction sequence was optimized by numerical simulation,and it is concluded that the impact of construction on ground can be effectively reduced when the sequence for three-hole and four-hole pipe jacking is 1-3-2 and 1-3-2-4 respectively.At the same time,the key points of construction,such as the layout of intermediate jacking station and thixotropic slurry grouting of drag reduction are described.In view of the problems such as water seepage and leakage in pipe jacking hole and huge boulder during pipe jacking construction,the handling methods adopted in the project are provided.By adopting the above key construction techniques,the project has achieved good results.

关 键 词：顶管施工 多孔顶管 触变泥浆 

分 类 号：TU94[建筑科学—建筑技术科学]