Cylindrical steel bunker for protection during earthquake; has steel half-shells with longitudinal and transverse T-shaped profiles to reinforce interior, welded together

摘要

The bunker has two steel half-shells (4,5) that are welded together. The interiors of the shells are reinforced by longitudinal (2) and transverse (6) T-shaped profiles. Preferably, circular steel plates close both ends of the cylindrical part, and have special entrances fitted to them, with strong rubber fitted at the periphery, coated with luminous phosphor strips.