Underground storage tank structure for liquefied natural gas and construction method thereof

Abstract

The invention discloses an underground storage tank structure for liquefied natural gas and a construction method thereof. The underground storage tank structure for liquefied natural gas is characterized in that an underground diaphragm wall and a lining wall jointly form an outer tank structure of a prestressed wall, the outer tank structure, an inner tank body and a heat-insulating layer form atank structure of an LNG (liquefied natural gas) underground storage tank, the lining wall is disposed on a bottom plate, the bottom of the lining wall is connected with the underground diaphragm wall through anti-shear connection keys; a vertical settlement joint is arranged between the bottom plate and the underground diaphragm wall; a transverse settlement joint is arranged between the bottomplate and the lining wall; a prestressed wall structure for annular pressure grouting is arranged outside the underground diaphragm wall. The construction method comprises the specific steps of reversely constructing the lining wall along with excavation of soil, constructing the bottom plate, and constructing the inner tank body and the heat-insulating layer. Compared with the prior art, the underground storage tank structure for liquefied natural gas and the construction method thereof have the advantages that safety is high, economy is good, small space is used, working efficiency is high,free settlement under full tank condition can be met, bulging of the inner tank under empty tank condition can also be controlled, and the tank structure cracking problem due to local stress concentration and fatigue cycle is well solved.

Description

technical field [0001] The invention relates to the technical field of building underground space excavation, in particular to a liquefied natural gas underground storage tank structure combined with an underground continuous wall and a construction method thereof. Background technique [0002] As the proportion of LNG (liquefied natural gas) as my country's primary energy increases year by year, the consumption ratio of LNG (liquefied natural gas) will increase from 6.8% to 10% by 2020. Since 2016, the progress of LNG (liquefied natural gas) receiving stations has been significantly accelerated. my country plans to build hundreds of large LNG (liquefied natural gas) storage tanks in the near future. LNG underground storage tanks (including semi-underground storage tanks, etc.) are widely used in the world. The operation of underground storage tanks and semi-underground storage tanks in Japan and South Korea is good. However, limited by economic and technical constraints, my...

AI Technical Summary

Problems solved by technology

LNG underground storage tanks (including semi-underground storage tanks, etc.) are widely used in the world. The operation of underground storage tanks and semi-underground storage tanks in Japan and South Korea is good. However, limited by economic and technical constraints, my country's The technology and development of LNG underground storage tanks are still lacking

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