Airport runway flight intervals

There are no specifications for this, but there should be. The takeoff and landing interval must be 3-5 minutes theoretically, and it may be longer if the aircraft in front of you is a large one. You said the relationship between the runway and the aircraft axle load I did not find any specification, but I think there should be, is based on the airport traffic to determine the concrete ratio, and the degree of settlement of the foundation, large and busy airports such as Beijing, Shanghai, Guangzhou, such as 4F airport and 4C airport runway is certainly different. As for the runway running a few hours a day or depends on the flight situation, sometimes 24 hours a day, like Beijing, such as the early hours of the morning there are airplanes landing and taking off, or like other airports in the early morning late to arrive, or other field to the field to prepare for the landing of this special case also need to run 24 hours a day, a class of the 4D airport is basically the morning of the 7:30 at the latest to the early morning at 2:00 am on the closure of the 4C airport. Some 4C airports have a dozen or even a few airplanes a day are open for a shorter period of time.