Patent classifications
E
FIXED CONSTRUCTIONS
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E02
HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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E02D
FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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29/00
Independent; underground or underwater structures; Retaining walls
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E02D29/045
Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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E02D29/05
at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
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E02D29/055
further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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