沉管隧道基础抛石夯平装备与施工技术

Equipment and construction technology of riprap tamping for immersed tunnel foundation

沉管隧道基础块石抛填夯平施工为港珠澳大桥基础性工程,需对海底隧道深基槽中抛填10~100 kg块石,通过水下夯平增加基床的密实度,提高沉管基础的承载力,再进行碎石垫层铺设及沉管沉放对接安装。该工程具有工程量特别大、施工区域特别长、施工海域通航特别复杂、施工难度非常大、精度和环保要求非常高、工期特别紧等特点,文章详细介绍了抛石夯平装备的开发与施工技术的成功应用,可为类似外海、深水、大径流、深基槽地基处理工程提供借鉴。

The construction of riprap tamping for the immersed tunnel foundation is a basic project of the Hongkong-Zhuhai- Macao Bridge. It is necessary to fill 10-100 kg block stones in the deep base trough of the submarine tunnel, increase the compactness of the base bed through underwater tamping, and improve the bearing capacity of the immersed tube foundation, and then lay the gravel cushion and install the immersed tube sinking and docking. The project has the characteristics of a particularly large project volume, a particularly long construction area, a particularly complex navigation in the construction sea area, a very difficult construction, very high accuracy and environmental protection requirements, and a particularly tight construction period. This paper introduces the development and successful application of the construction technology of the riprap tamping equipment in detail, which can provide reference for similar foundation treatment projects of offshore, deep water, large runoff and deep foundation trough.