| 摘要 |
PURPOSE: A dome-shaped roof is provided to improve strength and waterproof properties by coating the roof with flame retardant polyurea. CONSTITUTION: A dome-shaped roof comprises multiple triangular structures(100) and cores(200). The triangular structures have core insertion grooves(160). The cores couple the triangular structures to each other. Each core has separation prevention protrusions(210) and separation prevention grooves(220). The separation prevention protrusions are inserted into the core insertion grooves of the triangular structures.
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