Underground cavity for storage of e.g. liquefied gases - realised by economical process giving cavity of medium size

摘要

Method of realising an underground cavity for storage e.g. liquefied gas such as propane or butane comprises excavating a vertical shaft to the depth foreseen for the bottom of the cavity and of sufficient size for personnel and material to be lowered and raised and for debris to be raised, then excavating a horizontal gallery extending from the bottom of the shaft to the site foreseen for the cavity and excavating the cavity from the bottom upwards. Invention provides an economic realisation of an underground cavity of medium size utilisable for what is today a small storage.