1. The construction drawing has been approved: the construction drawing is a guiding document for engineering construction, which is very important for construction quality and safety. Construction drawings must be strictly examined to ensure completeness, accuracy, compliance with requirements and meet construction needs.
2. The construction organization design or construction scheme has been approved: the construction organization design or construction scheme is the guiding document of the construction unit, including construction technology, technical scheme and safety measures. The scheme must be approved by the construction unit and supervision unit to ensure the construction quality and safety.