摘   要：桶式基础结构的浮运安装采用气浮及负压安装工艺，气密性至关重要，同时设计对混凝土提出了耐久性的高标准要求，气密性高性能混凝土在水运工程中没有成熟的施工经验。本文以实际工程为例，介绍了气密性混凝土的配制、气密性的测试方法、混凝土的施工控制等，可供类似工程参考。Abstract: The float installation of bucket-based structure is applied by air-flotation and installation process, the structure concrete air tightness is essential, at the same time, the design of concrete durability with high standard is proposed, the tightness of high performance concrete in marine engineering has little mature construction experience. For practical engineering as an example, mix design of gas-tightness concrete, test methods of air tightness, and construction control of concreteare intraduced, which can be used for reference in the similar projects.