underground or underwater structures (underground tanks B65D88/76; hydraulic engineering, e.g. sealings or joints, E02B; underground garages E04H6/00; underground air-raid shelters E04H9/12; burial vaults E04H13/00); Retaining walls

Child Classifications

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• E02D 29/02 Retaining or protecting walls (piers or quay walls E02B3/06)
• E02D 29/04
• E02D 29/045 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
• E02D 29/06
• E02D 29/063 Tunnels submerged into, or built in, open water (construction or placing of caissons in general E02D23/00; joining caissons to each other under water, in general E02D25/00)
• E02D 29/08
• E02D 29/10
• E02D 29/12 Manhole shafts; Other inspection or access chambers; Accessories therefor (for underground tanks B65D90/10; for sewerage E03F5/02 )
• E02D 29/16 Arrangement or construction of joints in foundation structures (; sealing joints not restricted to foundation structures E04B1/68)