水下大面积基坑快速开挖施工方法——北引渠首工程中应用实例

Research and Application on Construction Method of Foundation Underwater Excavation in Large Area at Canal Head Flood Sluice of Northern Nen River Water Diversion Project

针对北引泄洪闸工程特定条件下的基础开挖,且受水的深度影响,不能采用常规的降水方法施工。采用文中施工方法,集水下翻松、挖除水面、水面输送于一体,开挖效率显著提高,加快了施工进度。将对水下地质条件复杂的大面积基坑开挖起到补充和完善的作用,同时,对于加快水利工程建设,降低工程成本,提高工程质量,实现工程项目的早日投运和效益的发挥,解决工程实际难题,显得尤为必要。

Based on the foundation excavation in specific deep water condition which is influenced by the water depth, the conventional construction method of drainage can not be adopted, the study integrates the underwater loosening, and removing of water surface and transportation on water surface together, increases obviously the efficiency of excavation and speeds up the construction progress. The results show that it will be beneficial to the foundation excavation in large area where the geological conditions are complex, meanwhile, it is of great significance in accelerating water conservancy project construction, reducing the engineering cost, improving the project quality, realizing early the operation and efficiency of the project, and is necessary in solving the practical problems about the project.