E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
E21D11/14—Lining predominantly with metal
E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
E21D11/24—Knuckle joints or links between arch members
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Engineering & Computer Science
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Mining & Mineral Resources
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Civil Engineering
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General Life Sciences & Earth Sciences
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Vibration Prevention Devices
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Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body
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