Arch members

Introduced: September 1968

Last revised: January 2006

Full Title

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

Classification Context

Section:: FIXED CONSTRUCTIONS
Class:: EARTH OR ROCK DRILLING; MINING
Subclass:: SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS

4 direct subcodes

Child Classifications

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E21D 11/2 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