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, careful planning and execution of line marking are essential to achieve a high-quality layout.
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 process typically starts with determining the central axis, which serves as the foundation of the design. Using the wire measurement technique, the central point “O†can be accurately located on-site. Three key points must be measured: the center point “O,†and the two side points “O1†and “O2.†From these, arcs are drawn using the designed radius R1, centered at O1 and O2 respectively. These arcs define the start and end points of the semicircular sections—T1, T2, T3, and T4. By connecting T1 with T3 and T2 with T4, the inner loop of a 400-meter track is formed. A visual representation of this layout is shown in the image below.
Following the same principle, the outer boundary of the track is determined by drawing arcs with a larger radius R2 from the centers O1 and O2. This creates four new points—T5, T6, T7, and T8. Connecting T5 with T7 and T6 with T8 forms the outer loop of the track. Further extensions lead to T9 and T10, which represent the direction lines for the 100-meter and 110-meter races. Additionally, the safety zones are extended to T11 and T12, completing the full layout of a 400-meter track and field complex.
Beyond the track, other areas such as the shot put circle, long jump pit, pole vault area, and the 3000-meter obstacle course are marked using geometric or coordinate-based techniques, starting from the reference points O1 and O2.
To ensure long-term accuracy and stability, the three key reference points—O, O1, and O2—should be marked with permanent markers, such as copper or stainless steel round piles. These should be securely installed on-site to serve as fixed reference points for future maintenance, line marking, and event planning. They provide the foundational structure for the entire field layout and are vital for maintaining consistency and precision over time.
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