Design and optimization of the waterproof and air-tight scheme for LNG process tunnels

Process tunnels at LNG receiving stations are involved with the crossing of ultra-low temperature pipelines and the Class A dangerous media, so it is of great importance to ensure the waterproof and air-tight performance of the process tunnels. The process tunnel at Shenzhen LNG receiving station is the first specialized LNG tunnel in China. Its special waterproof and air-tight scheme is designed based on its hydrogeological conditions referring to the waterproof and airtight schemes of two existing specialized LNG process tunnels abroad. And the process of EVA single compound waterresistant plate+ 3 mm acrylate film is innovatively introduced into this scheme. In the process of the project construction, the waterproof and air-tight design scheme is adjusted and optimized based on the actual situations at the construction site to conquer the problems, such as tight schedule and high construction difficulty. And consequently, the comprehensive waterproof and air-tight optimization scheme is put forward. The practice results show that the optimized waterproof and airtight scheme is better than the original one in terms of schedule, economy and waterproof and air-tight effect. The research results provide the references for similar engineering designs with higher-level waterproof and air-tight requirement at home and abroad.