[1]杨国洪.对澳供水工程大口径平行顶管与附属工程设计[J].中国给水排水,2025,41(8):83-90.
YANGGuo-hong.Large Diameter Parallel Pipe Jacking and Auxiliary Engineering Design of Macao Water Supply Project[J].China Water & Wastewater,2025,41(8):83-90.
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YANGGuo-hong.Large Diameter Parallel Pipe Jacking and Auxiliary Engineering Design of Macao Water Supply Project[J].China Water & Wastewater,2025,41(8):83-90.
对澳供水工程大口径平行顶管与附属工程设计
中国给水排水[ISSN:1000-4062/CN:12-1073/TU]
卷:
第41卷
期数:
2025年第8期
页码:
83-90
栏目:
出版日期:
2025-04-17
- Title:
- Large Diameter Parallel Pipe Jacking and Auxiliary Engineering Design of Macao Water Supply Project
- 摘要:
- 因前山水道出海口船闸建设需要，拟对现有2条对澳供水管进行迁改。其中，经过前山水道顶管段约650 m为工程关键线路，采用2根DN1 800钢管，埋深约15.30 m。针对常规大口径单管顶管占地大、工期长、并网时水质冲击大等技术难点，一方面采用双管并行交错同步顶管施工工艺，顶管机头前后错开约30 m交替顶进，同步推进速度达20 m/d，节省约1个月工期。同步平行顶管的管间距需根据机头扰动宽度及触变泥浆有效渗透半径，加上管道破坏时压力水释放的影响进行综合考虑，设计管间净距为3 m，工作井内径取15 m，接收井内径为10 m。另一方面，通过大口径附属阀门井的优化设计，辅以压入式沉井法施工顶管井，实现了井体快速稳健下沉，并在减少用地的同时有效控制地面沉降。最后，经过有组织的冲洗碰口，减少了管道并网时对现状系统的影响。该工程目前已稳定运行2年多，相关设计经验可供类似工程参考。
- Abstract:
- Due to the construction of the ship lock at the outlet of the Qianshan Watercourse, it is planned to relocate and renovate the two existing water supply pipes to Macao. Among them, the pipe jacking section of the Qianshan Watercourse approximate 650 m long is the key route of the project, and uses two DN1 800 steel pipes buried at a depth of 15.30 m approximately. In response to the technical difficulties of conventional large diameter single pipe jacking, such as large footprint, long construction period, and significant water quality impact during grid connection, the project creatively adopted the double pipe parallel staggered synchronous jacking construction process. The jacking machine head has been staggered by 30 m alternatively, and the synchronous pushing speed of the double pipes can reach 20 m/d, saving about a month of construction period. The spacing of synchronous parallel pipe jacking has been comprehensively considered based on the disturbance width of the machine head and the effective penetration radius of the thixotropic mud, as well as the impact of pressure water release during pipeline failure. The design net distance between the pipes is 3 m, the inner diameter of working well is 15 m, and the inner diameter of receiving well is 10 m. On the other hand, by optimizing the design of large diameter auxiliary valve wells and using the press?in caisson method to construct the pipe jacking well, it can realize rapid and steady sinking of the well body, effectively control ground settlement and reduce the impact on existing buildings while reducing land use. Finally, organized flushing was carried out to reduce the impact of pipeline grid connection on the current water supply system. The project has been running steadily for over 2 years, and the relevant design experience can be used as reference for similar projects.
更新日期/Last Update:
2025-04-17