Manufacturing technology for cold-preserving and heat-insulating sleeve of full-capacity liquefied natural gas storage tank

The invention discloses a manufacturing technology for a cold-preserving and heat-insulating sleeve of a full-capacity liquefied natural gas storage tank. The manufacturing technology comprises the prefabrication steps of 1, prefabricating a low temperature pipeline, an outer layer protection pipe and an upper protection pipe sealing plate and forming a closed cold-preserving material pouring space; 2, carrying out on-site pouring work on foaming cold-preserving material; 3, blocking a lower protection pipe sealing plate and completing manufacturing of the whole cold-preserving sleeve; and 4, installing the cold-preserving sleeve on concrete on the top of the full-capacity liquefied natural gas storage tank and carrying out tank top concrete work. According to the manufacturing technology, air in the cold-preserving space can be completely discharged out of the cold-preserving space, and the problem that complex processes are needed for displacing the air in the cold-preserving material through nitrogen gas i