400 meters track and field stadium how to measure line

In the construction of a sports field, ensuring precise measurement of the pay-off line is crucial. This accuracy directly affects the overall standard of the facility and the fairness of competition results. Therefore, proper line marking and measurement play a vital role in the entire process. There are several methods for measuring the pay-off lines, with the coordinate method and the set graphic method being the most commonly used. The first step involves determining the central axis, which serves as the reference point for the entire design. Using the wire measurement technique, the center point "O" can be accurately located on-site. Three key points must be measured: the central point "O" and the two symmetric points "O1" and "O2" on either side. With "O1" and "O2" as centers, arcs are drawn using the designed radius R1 to mark the start and end points of the semicircular sections—resulting in points T1, T2, T3, and T4. Connecting T1 with T3 and T2 with T4 forms the inner boundary of the 400-meter track. Similarly, by using the same central points and increasing the radius to R2, the outer boundaries are established. Arcs are drawn from "O1" and "O2," resulting in four additional points—T5, T6, T7, and T8. Connecting T5 with T7 and T6 with T8 extends the outer loop of the track. Further extensions provide the 100-meter and 110-meter direction lines, while also accounting for safety distances, leading to points T9, T10, T11, and T12. This completes the full layout of the 400-meter track and field complex. Additionally, using "O1" and "O2" as reference points, various zones such as the shot put area, long jump pit, pole vault area, and the 3000-meter obstacle course are measured one by one using geometric or coordinate techniques. To ensure long-term accuracy and stability, the three critical reference points—O, O1, and O2—should be marked with durable, standardized round piles made of copper or stainless steel. These should be permanently embedded on-site to serve as fixed reference points for future maintenance, line marking, and event planning.

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