CPC Subgroup
E21D 11/18 Arch members
Full Title
Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling (E21D15/00 - E21D23/00 take precedence; specially for shafts E21D5/00; ; lining pressure water galleries, linings therefor E02B9/06) > Lining predominantly with metal > Arch members
6 direct subcodes
Child Classifications
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- E21D 11/20 Special cross- sections, e.g. corrugated
- E21D 11/22 Clamps or other yieldable means for interconnecting adjacent arch members either rigidly, or allowing arch member parts to slide when subjected to excessive pressure
- E21D 11/24 Knuckle joints or links between arch members
- E21D 11/26 Shoes for connecting arch members to longitudinal struts