大尺寸沉井与长距离顶管在取排海水工程中的应用

Application of large-sized sinking well and long-distance pipe jacking in seawater intake and discharge engineering

工程项目实施中,需要重点关注工程费用与环境保护问题。水运项目中的取水泵房、排水井、取排水管道主要采用大开挖+现浇的传统干施工法,以及大开挖+沉管的水下施工方式。相较于传统方法,采用沉井+暗挖顶管的新工艺,介绍沉井与暗挖顶管的应用现状、重点和难点。以广东省某LNG(液化天然气)工程为背景,对不同工法的工序工期、质量验收标准、工程费用、环境保护、施工安全等进行对比分析。通过研究发现,采用沉井及顶管方案在工程费用与环境保护方面具有显著优势。实践证明,大尺寸沉井与长距离顶管方案在取排海水工程中应用良好,可为类似工程设计与施工提供参考。

In the implementation of engineering projects,it is necessary to focus on engineering costs and environmental protection issues.The water intake pump room,drainage well,and water intake and discharge pipeline in the port and waterway engineering construction mainly adopt the traditional dry construction method of large excavation+cast-in-place,and the underwater construction method of large excavation+sinking pipe.Compared with traditional methods,a new technology of sinking well and underground excavation pipe jacking is adopted,and the current application status,key and difficult points of sinking well and underground excavation pipe jacking are introduced.Taking a LNG(liquefied natural gas)project in Guangdong Province as the background,a comparative analysis is conducted on the working procedure and construction period,quality acceptance standards,engineering costs,environmental protection,construction safety,and other aspects of different construction methods.Through research,it has been found that the use of sinking well and pipe jacking schemes has significant advantages in engineering costs and environmental protection.Practice has proven that the large-sized sinking well and long-distance pipe jacking schemes are well applied in seawater intake and discharge engineering,and can provide reference for similar engineering design and construction.