1. The distance between the entrance and exit of the underground garage and the starting point of the basic road intersection or elevated road shall not be less than 7.50 meters; The slope is 7.5%

2. The entrance and basement floor shall be set with a gentle slope of 7.5%, and the gradient shall not be less than 7.5m. The outdoor floor shall be set with a gentle slope of 7.5%, and the gradient shall not be less than 7.5m. The gradient of the middle section shall not exceed 15%, and the gradient length shall be determined by the indoor and outdoor elevation difference.

3. When the entrance of the underground garage is perpendicular to the road, the exit population shall keep a safe distance of not less than 7.50 meters from the red line of the road; It is also required that the line of sight of 2 meters is unobstructed, and a total of 9.5 meters and 5 lines of sight are blocked.

Extended information

1. The car ramp shall not exceed the requirements for special large gradient specified in Table 4.1.7 of Code for Design of Garage Buildings.

2. When the longitudinal slope is greater than 10%, gentle slopes shall be set on both sides of the slope;

3. The lane in the curve section shall also be set with a special transverse height, that is, the curve shall be set with a special height, so as to balance the centrifugal force and transverse slope generated by vehicles traveling on the curve.

4. The water retaining counter slope and transverse long intercepting ditch shall be set at the starting point of the ramp.

The design of garage base entrance and exit shall comply with the following provisions: 1. The number and location of the entrance and exit of the base shall comply with the current national standard General Principles for Design of Civil Buildings (GB 50352) and the relevant provisions of urban traffic planning and management; The entrance and exit of the base shall not be directly connected with the urban expressway, nor with the urban trunk road; 3. The width of the main entrance and exit of the base shall not be less than 4m, and the connection between the entrance and exit and the internal passage shall be smooth. 4. When it is necessary to handle vehicle entry and exit procedures at the entrance and exit of the base, waiting lanes shall be set at the entrance and exit, and urban roads shall not be occupied; The width of the waiting lane for motor vehicles shall not be less than 4m1775 and the length shall not be less than 10m. Non motor vehicles should have waiting space.

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