Natural grass bed construction differs significantly from other site development methods, especially in soil preparation. To meet the design specifications and ensure proper growth of grass seedlings, effective drainage is essential. The key steps in this construction method are as follows:
1. The first step involves marking out the field lines using the center stake to determine the exact position of the site. The four corner kicks are placed accurately using a coordinate system, and the size and angle of the field are checked using diagonal measurements or alternative testing methods to ensure precision.
2. During the leveling process for each structure, a square grid method is used for height control, rather than vertical and horizontal slope methods. The square grid is typically 5 meters by 5 meters, ensuring even distribution and accurate elevation across the site.
3. Once the earthwork is complete, the entire site must be compacted using a roller. A light roller or vibratory compactor with a weight of at least 12 tons is used. Compaction serves two purposes: leveling the ground and ensuring uniform density to prevent uneven settlement. Any high or low spots should be filled or removed, aiming for a compaction density of up to 95%. No loose soil or slush should remain, as this can lead to future issues like uneven settling. Bulldozers alone are not sufficient for this stage, as they may not provide the required stability for the next processes.
4. A gravel layer is installed to aid in drainage. The materials used must be clean and free from debris. Each layer should not exceed 20 cm in thickness, and after laying, the entire field should be rolled with a large crawler bulldozer at least twice to ensure compaction and stability.
5. The blind ditch construction comes after the first drainage layer is completed. Each blind ditch must have a proper slope to ensure smooth water flow, without any blockages or backwater. After placing the filter pipe, gravel is carefully placed on both sides and compacted. The filling should follow a layered approach—large gravel, then coarse, fine, and finally sand—without random mixing. All excavated soil should be removed from the site to maintain cleanliness and functionality.
6. The sand used for backfilling is often sourced from riverbeds or mountain areas, which may contain harmful bacteria, nematodes, and weed seeds. Therefore, it is crucial to disinfect the soil before mixing to eliminate these contaminants. In the past, a waiting period was necessary after the sand arrived to allow for natural sterilization, but now more efficient methods are applied.
7. 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 the grass roots to pass through and interlock, preventing large sections of turf from lifting when athletes perform actions on the field.
8. Before planting the grass, a final measurement is taken to check the elevation, slope, and overall flatness. The surface should be level, with a maximum deviation of 1 cm to ensure a smooth and even playing surface.
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