What is the construction method of the natural grass bed in football field?
September 22 07:33:38, 2025
Natural grass field construction differs significantly from other site development processes, particularly in soil preparation. To meet the design specifications and ensure optimal grass growth, proper drainage is essential. The key steps in this construction method are as follows:
First, precise layout work is carried out to define the boundaries of the field. Using the central stake as a reference, the exact location is determined. The four corners are placed accurately using coordinate methods, and the size and angle of the field are checked using diagonal measurements or alternative verification techniques.
For leveling each structure, a square grid system with 5m x 5m spacing is used for height control, rather than relying on vertical and horizontal slope methods.
After earthwork is completed, the entire site undergoes compaction using a roller. A light roller or vibratory roller is typically used, with a minimum weight of 12 tons. This process ensures both leveling and uniform density, preventing uneven settlement. Any high or low areas should be addressed by filling or raising, aiming for a compaction density of up to 95%. No loose soil or slush should remain, and bulldozers alone are not sufficient for this step, as improper compaction can lead to future issues like uneven settling, which may affect the lawn’s performance and maintenance.
Next, a gravel layer is laid to aid in drainage. The materials must be clean and free from debris. Each layer is applied in sections no thicker than 20cm, followed by rolling with a large crawler bulldozer at least twice to ensure even distribution and compaction.
The next phase involves constructing blind ditches after the first drainage layer is in place. These ditches must have a proper gradient, smooth surfaces, and no backwater. After installing the filter pipes, gravel is placed on both sides and compacted. A layered approach is used—starting with large gravel, then coarse, fine, and sand—to prevent random filling. Finally, the excavated soil is removed from the site.
Currently, backfilling sand often comes from riverbeds or mountain sources, which may contain harmful bacteria, nematodes, and weed seeds. Therefore, it is necessary to disinfect the soil mixture before use. Previously, this required waiting for a period after the sand was delivered to allow for natural sterilization.
To enhance the stability of the grass roots, a tensile material is placed beneath the topsoil. This grid-like material has openings no larger than 1 cm, allowing grass roots to pass through and interlock, which helps prevent large sections of turf from lifting during play.
Before planting, a final measurement is conducted to check elevation and slope, ensuring the surface is level. The maximum allowable flatness error is generally 1 cm.
This detailed process ensures that the natural grass field is durable, functional, and aesthetically pleasing, providing an ideal playing surface for athletes.
