Wrapping carbon fiber reinforce polymer sheet (CFRP) and bonding Angle steel are two common methods in reinforced concrete columns reinforcement engineering nowadays.

Such technology as reinforcement of old structural components, treatments of joints for new and old components and application of profiled sheet-concrete composite floor etc.

Currently, how to design a rational and effective large volume square flameproof case made of steel sheet with reinforcement, is a subject studied by experts both in China and abroad.