Factory Expansion:

• Vertical expansion should start with the current structure, using scaffolding and prefabricated components to speed up the process.
• Prioritize structural reinforcement, especially for load-bearing columns and external wall support.
• Use lightweight materials to reduce the load, especially for the upper floors.

To complete the factory renovation and expansion within 20 days, the focus should be on detailed upfront planning, efficient team collaboration, and strict progress management. Utilizing prefabricated components, speeding up approvals, parallel construction efforts, and flexible project management will be key to success.