A. Line marking material: Use elastic polyurethane professional line marking paint. (Different white line paints have different mixing ratios, typically as follows: curing agent: thinner = 1:0.4:0.2-0.5. Mix the white paint and curing agent thoroughly before adding the thinner.)
B. Material characteristics: Wear-resistant, hydrolysis-resistant, strong adhesion, and strong color retention.
C. Layout and measurement: Use a calibrated total station and 100m steel tape measure to set point lines. Each point line should meet the track/field requirements, with an internal control index relative error of ±0 to ±1/10000.
D. Measurement and marking of the lines: After laying out the lines, the contractor provides the marking data (attached in a table), which must be confirmed by the client and the supervisor before marking the lines on the track/field. The lines should be clear and accurate.
Line Marking Precautions:
A. Measure and determine the position of various marking lines according to the marking data. Repeatedly measure and check to ensure the required accuracy. Only after confirming the accuracy should the markings be made on the rubber surface using large head pins and chalk lines.
B. The layout must be reviewed by sports technicians. The angles should be checked using the radiating line length, and straight lines should be re-checked using a calibrated steel tape (including length and temperature corrections). Confirm compliance with standards before proceeding with line spraying.
C. During line spraying, repeatedly check the width of the spraying wooden box or the spraying nozzle of the marking machine to ensure it meets the IAAF regulations. Adjust if necessary.
D. The operator should control the distance and angle of the spray gun from the rubber surface to ensure the aesthetics and uniform color of the lines.