Rolled-up maps attached to a pole

I am taking an international flight via Singapore airlines from Beijing airport to Singapore. I will be taking either the Business or Economy class. I have some "rolled-up maps attached to a pole". Each map weighs approximately 1.5kg to 2kg. The dimensions for Map A is 160cm by 120cm, for Map B is 125cm by 108cm and for Map C is 150cm by 110cm. Please advise if we can get through the customs at Beijing airport and how to transport my items to Singapore at the airport. At the check-in counter, is there an option for air freight and what will be the process? Please share your recommendations/suggestions. Hear from you soon. Thank you.