The 400M standard track.

1. The perimeter of the inner edge of the track is 398.116 meters, and the calculation formula is:

36.5m×2×3.1415926+84.39×2=398.116m.

2. The perimeter of the theoretical running route of the first lane in the standard plastic track sports field is 400m, which is calculated according to the running distance of 0.3m from the inner edge of the track (excluding the width of the road teeth). The calculation formula is: (36.5m +0.3m)×2×3.1415926+84.39×2=400.00m.

3. The width of each lane in the standard plastic track construction sports field is 1.22m, including the lane width of 0.05m; except for the first lane, the other lanes are measured at the left lane marking line 0.2m. calculate.

4. The safety zone on the outside of the track should be no less than 1 meter away from the track.

5. The west straight of the standard plastic track sports ground is set as the starting point for the 100-meter sprint and 110-meter hurdles, as well as the same end point for all track races. The finish line is located at the junction of the straight and the curve.

6. When necessary, the east straight road can be set up on the east side of the standard plastic track sports field, and the second end point can be set on the east straight road, which is only for sprint training and preliminaries.

7. When conditions permit, the West Straight can be appropriately increased by 1-2 lanes, avoid the inner lane during training, reduce the ground wear of the first lane, and prolong the service life of the track.

8. The allowable deviation of 400 meters of the circular track of the standard plastic track sports field is +0.04m, and the allowable deviation of 100m of the west straight road is +0.02m. Negative deviation values are not allowed.

The 400-meter standard track and field track (semi-circular track and field) is simply an oval closed sports field composed of two semicircles + two straight tracks. Its size and specifications changed several times until the 1980s, when it was first confirmed that the radius of the semicircle (curve) was more suitable between 35 and 38 meters, and it gradually changed from 36 meters to 37.898 meters. Now the semicircle (curve) radius should be 36.50 meters.

At present, the track and field tracks of large venues in the world are also trimmed to this standard.

But after all, there are many old venues, so the track with a radius of 36 meters, 37.898 meters, and the most standard 36.50 meters can all be considered as "400-meter standard tracks".

The radius of the curve is 36.5 meters, and the length of the straight is 84.39 meters. Do a calculation:

(π × 36.5 meters + 84.39 meters) × 2

This result is the distance between the inner circle (first track) of the standard track and field—the answer is 398.116 meters, which is almost two meters shorter than the "standard" of 400.

Many people think that ""400 meters" is the length of the first line, that is, the inner circle line at the farthest point." This cognition is obviously not accurate.

In fact, the "400 meters" of a standard track is a distance measured 30 centimeters away from the inner edge of the inner circle of the track. which is:

{π × (36.5m+0.30m)+84.39m}×2=400.00m

The protruding edge is the isolation on both sides of the track, generally 5-6.5 cm high and 5 cm wide bulges, both inside and outside the track, somewhat similar to the "threshold" of entering the track. However, after the popularization of plastic tracks, many stadiums no longer build sharp edges and replace them with 5 cm wide marking lines. Stadiums without sharp edges will use this marking line as a benchmark.

So, if it is a special standard modern track and field track, it will meet such a condition:

The radius of the curve is 36.5 meters, and the length of the straight is 84.39 meters. It is measured at 30cm on the outer edge of the inner circle line, and it is exactly 400 meters long after one circle.

A standard stadium generally has 8 lanes, and the width of one lane is between 1.22-1.25 meters. This distance includes a 5 cm wide separation white line.

Take the most common standard stadium with a width of 1.22 meters and 8 tracks as an example:

From the second to the eighth, the radius of the curve increases by 1.22 meters from the inside to the outside, then the radii of the second to eighth curves are 37.72 meters, 38.94 meters, 40.16 meters, 41.38 meters, 42.6 meters, 43.82 meters, 45.04 meters.

If they all run one lap on their respective tracks, the actual distance of the second track is 405.78 meters, and the actual distance of the eighth track is 451.77 meters - also in between this, the starting line of the 200-meter run, from the second track to the previous one. Move forward 3.83 meters. The starting lines of 400 meters and 800 meters are moved 7.66 meters forward from the second course in order to ensure that the distance between the runners is as consistent as possible.

However, except for the straights, everyone has the same distance. Even if the runners of different lanes try to run on the inside of their respective tracks, a slight deviation will lead to more distance. Don't underestimate this distance. On the track and field, it often happens that two decimal places are used to determine the title of the championship. The difference is measured in centimeters.

1. Marking width: The international road marking width is 15 cm. Considering that the marking machine may be used in parking lots, residential areas and other places, it is necessary to purchase a marking machine with width adjustment function, which will help to reasonably Use and save paint. Generally, the adjustable range is 5 to 15 cm.

2. Types of paints: Commonly used paints are solvent-based and water-soluble. If the liners are not "choosy", both can be used, allowing your business to expand to places such as sports field lawns.

3. Hand-held spray gun: Using the hand-held spray gun not only allows you to freely use the template to spray various symbols, but also works on walls, columns and other places other than the ground. Hand-held spray guns have slowly become the standard configuration of all types of marking machines.

4. Cleaning system: Some marking machines are equipped with an automatic cleaning system, which can quickly clean the pipeline system after each stop, saving more than half of your cleaning time.

5. Glass microbead system: Road maintenance companies should also consider configuring glass microbead spreading system as a standard configuration. The system can spray glass microbeads, so that the marking construction can fully meet the national requirements.

6. Curved work: Some marking machines also install an extra wheel at the rear, which allows you to freely construct along the curved markings.