Shenzhen Chiwan Metro Parking Lot A contracted project, Chiwan Parking Lot has about 1,221 columns, nearly 100,000 square meters of beams and slabs, and 328,000 cubic meters of concrete. Faced with the extremely large concrete pouring volume, Shenzhen Metro and China Power Construction jointly created the "mirror concrete", from the concrete raw material mix ratio design, construction plan, warehouse surface design, steel bar ratio, standardized large templates, process control to the subsequent concrete temperature control and crack prevention, maintenance, every link is strictly controlled. Mirror concrete is in line with the concept of green development, greatly reducing the amount of later decoration work, and has been widely praised by the industry and outside.