Hardness, flatness and drainage slope. There are two types of commonly used artificial turf grounds: asphalt base, cement base, and gravel base. Which types are mainly used by the local climate, climate and budget, and are particularly suitable for climates with large temperature differences and low winter temperatures in the north. At the same time, because of its high cost, it is not the most suitable basic type for warm and humid environments. Because the construction of gravel foundation is simple, its construction cost is low, and drainage is rapid, it is common in the south, but because of its poor rigidity and stability, After prolonged use, loose foundations are likely to occur, resulting in uneven foundations; therefore, in most areas of China, the cement concrete foundation has become a basic type of artificial turf gateball that is economical and practical and has a very high cost performance. The artificial turf cement concrete foundation & asphalt foundation are briefly described as follows:
First, cement concrete foundation requirements
1. The flatness of the ground: the flatness pass rate is above 95%, and the 5 meter straightedge error is 3mm.
2. The slope of the ground: 3 to 4 inches in the center of the site, and the design of the turtle's back drainage. 8 turns, 5 turns straight, 5 turns semicircular, and the surface should be flat and smooth to ensure drainage.
3. The strength and stability of the ground:
The surface is uniform and solid, no cracks, no bad edges, and the joints are straight and smooth. The cut of 6000mm×6000mm is better. The cushion is compacted with a density of more than 95%. After medium-sized mill passes, there are no significant wheel marks, loose loose soils, and waves.
4. The ground water layer: the new PVC thickening water-repellent film, the overlap should be at 200mm, the margin is greater than 150mm.
5. The ground maintenance period: The basic maintenance period is 21 days.
6. Positioning of the ground: In order to accurately construct and draw lines, apply a firm and distinctive mark to mark the lines of the site.
Second, the basic requirements of asphalt
1. Ground flatness: The foundation should have a certain strength and stability, the foundation can not be product cracks and uneven frost heave due to freezing, flatness pass rate above 95%, 3 meters ruler error 3mm.
2. Ground slope: horizontal
3. Ground strength and stability:
Asphalt bases are preferably made of wax-free, or wax-free, bituminous materials whose asphalt mixture must be sufficiently compacted. The surface is uniform and solid, flat and crack-free, no lumps, no pockmarks, smooth seams. Asphalt concrete surface gravel diameter of 2-5mm, oil content of 5.8-6.4%, the particle size of the gravel joint is 6-9mm, containing 4.6-5.8%, no soft peeling, loose soil loose, waves and other phenomena.
4. Surface drainage: The drainage system must drain water two hours after heavy rain.
5. Ground maintenance period: Basic maintenance period is 28 days.
Computer chair by fabric:
1. Mesh fabric: high-back office chair, Mid-back office chair, Ergonomic adjustable chair.
2. Leather chair: large class chair is most used Leather: genuine leather and imitation leather.
3. Linen fabric:work chair, staff chair, middle class chair.
Computer chair by place of application:
1. Staff chair
2. Working chair
3. Student chair and traning chair
4. Meeting chair
5.Ergonomic chair
6. Mid-back office chair
7. High-back office chair
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