Data on the track and field with a radius of 36 5 meters

The 250-meter circular track field is a non-standard track and field field, there is no specific standard, according to the actual situation of the site, the longitudinal and transverse dimensions and the designer's intention (the ratio of curves and straights, the radius of the curve is small, the centrifugal force is large, the speed of the curve is not high, the radius of the curve is large, the straight road becomes shorter, which is not conducive to the acceleration of the straight).

If the actual site allows, you can also refer to the radius of the 400-meter standard track and field field to estimate the radius of the 250-meter non-standard track and field, generally speaking, the radius of 400 meters is between 35 meters and 38 (the standard is etc.), and 250 meters is about 23 meters.

1. The structure of the semi-circular track and field field.

a) Longitudinal axis.

The longitudinal axis is also known as the midline. It is located in the middle of the track and field field, and divides the entire track and field field into two equal parts according to the longitudinal axis. This line is the basic line for the design and construction of the athletic field, with a center point and the center of the two curves.

b) Center point.

The center point is the center of the entire track and field, located at the midpoint of the longitudinal axis, and it is the reference point that determines the center of the curve at both ends. After the track and field field is completed, it should be marked with a fixed sign for use.

3) Center of the circle. A semicircular track field has two centers, both on the longitudinal axis, at an equal distance from the center point. It is the center of the circle of the inner and outer protrusions of the bend and the lines of each branch. It should be marked with a fixed sign for use.

4) Inner and outer protrusions.

The inner and outer protrusions of the runway are the inner and outer edges of the runway. The height and width of the protrusion are both 5 cm, and the width of the protrusion does not count towards the width of the runway.

5) The dividing line between straight and curved sections.

The dividing line between straight and curved sections is the line that separates the straight and curved sections of the runway through the center of the circle and perpendicular to the longitudinal axis. Usually, the dividing line of the straight and curved sections at the end point is called the first straight and curved dividing line, and then arranged in the counterclockwise direction, in order of and Qi Fan.

II. 3. The dividing line between the fourth straight and curved sections.

6) Straights and straights.

The straight section refers to the straight track between two curves, the track and field field has two straight sections, the length of one straight section is equal to the distance between the two circle centers, and the straight section is the general name of a section of the track that extends at both ends of the straight section and the straight section. The length of the straight in a standard semi-circular track and field field must not be less than 140 meters.

7) Lane separation width and runway width.

The width of the lane is the width of each lane. In the case of a standard track and field field or a regular race, the track and field competition rules stipulate that the lane width is meters or meters. Runway width refers to the width between the inner and outer protrusions, also known as the total width of the runway.

viii) Lane Divider&

nbsp;A lane lane is a line that divides the runway into lanes, with a line width of 5 cm, including the width of the lane on the inside.

ix) Calculation line.

The calculation line is the line that calculates the perimeter of the runway and the perimeter of each lane division, and is not drawn on the runway. The rules of athletics competition stipulate that the calculation line of the perimeter of the first lane is the meter from the outer edge of the inner protrusion, and the perimeter calculation line of the other lanes is the meter from the outer edge of the inner lane separation line.

The radius of the inner and outer edges of the standard 400-meter track and field field is meters.

The Beijing National Stadium, the venue for the track and field competition of the 29th Olympic Games, is a standard 400-meter venue with a radius of meters.

Football field in the middle: The size of the quasi-11 football field is 68 meters and 105 meters. However, it is smaller than the venue of the international competition (the length must not be greater than 120 meters or less than 90 meters, and the width must not be greater than 90 meters or less than 45 meters).