Arch members

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings , e.g. by assembling > Lining predominantly with metal > Arch members

CPC:

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

Of 6 combined children, 4 exist in both systems.

2 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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E21D 11/183 CPC only CPC only
E21D 11/186 CPC only CPC only
E21D 11/20 Special cross- sections, e.g. corrugated IPC+CPC Available in IPC and CPC
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 IPC+CPC Available in IPC and CPC
E21D 11/24 Knuckle joints or links between arch members IPC+CPC Available in IPC and CPC
E21D 11/26 Shoes for connecting arch members to longitudinal struts IPC+CPC Available in IPC and CPC