FIELD: construction of underground structures in rocks providing for protection against seismic- blast waves and considerable hydrostatic pressure. SUBSTANCE: combination lining includes exterior contour, interior contour made of metal blocks in the form of a plate bent in radius with annular stiffening ribs projecting from its ends, anchoring members and end plates with holes for interconnection of metal blocks fastened to the stiffening ribs, and concrete. The exterior contour is made of metal tubings with extreme and middle annular stiffening ribs, and anchoring members of metal blocks are made in the form of reinforcing rods brought in the cells between tubing rings and furnished with metal anchor plates at the ends. Tubings are connected to metal blocks by conjugation assemblies, each of them has a U-shaped metal table in the form of a plate with ribs attached to the middle stiffening rib of the tubing, and a metal liner connected to the plates of adjacent metal blocks and linked with the table by means of stiffening rib. EFFECT: enhanced reliability of hydraulic seal. 2 dwg
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