136051 ⎘
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; Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members Laggings making use of fluid cushions, e.g. the fluid containing a hardenable material