EntityQ2016868· pop 14· linked from 117 articlestunnelling shieldSign in to saveprotective structure used during the excavation of tunnelsConnectionsLondonCityTaiwanCountryInternational Standard Book NumberEntityRiver ThamesEntitytunnelEntityLondon UndergroundEntityIsambard Kingdom BrunelEntityWaterloo & City lineEntityNorthern lineEntityTaipei MetroEntityoccupational health and safetyEntitytunnel boring machineEntityTeredinidaeEntityMoorgate stationEntityMarc Isambard BrunelEntityThomas Cochrane, 10th Earl of DundonaldEntityThames TunnelEntityHenry MaudslayEntitystructural loadEntityAlfred Ely BeachEntityCategoriesTunnel boring machines