IPC Main Group
E21D 9/00 Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Related Keywords
ADITSBORING tunnelsINSULATION of tunnelsTUNNELLING
7 direct subcodes
Child Classifications
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- E21D 9/01 Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level
- E21D 9/02 Driving inclined tunnels or galleries
- E21D 9/04 Driving tunnels or galleries through loose materials; Apparatus therefor not otherwise provided for
- E21D 9/06 Making by using a driving shield
- E21D 9/1 Making by using boring or cutting machines
- E21D 9/12 Devices for removing or hauling away excavated material or spoil; Working or loading platforms
- E21D 9/14 Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings