1, the limit and odor requirements of harmful substances in cast-in-place and prefabricated surface products "The release amount of harmful substances shall not be higher than 5mg/m3, formaldehyde 0.4mg/m3, carbon disulfide 7 mg/m3, benzene 0. 1mg/m3, and the odor grade shall not be higher than Grade 3.
2. Slope: horizontal < 1% (bend 8‰, straight 5‰, semicircle 5‰), vertical < 1‰, high jump area.
3. Smoothness: the pass rate of flatness is over 95%, and the error of 3m straightedge is 3 mm. ..
4. The standard runway is 400 meters long. It should consist of two parallel straight lines and two curves with equal radius. In addition to the grass runway, the inside of the runway should also be separated by protrusions made of suitable materials. The protrusion is about 5 cm high and at least 5 cm wide.
4. The length of the runway should be measured at a distance of 30 cm from the outer edge of the runway protrusion. If there is no protruding edge, it should be measured 20 cm away from the outer edge of the marking line. Note: The IAAF track and field facilities manual contains all technical information about track structure, design and marking. This rule gives the basic principles that should be followed.
For track events of 5.4400 meters and below, each athlete should have a lane with a minimum width of 1.22 meters and a maximum width of 1.25 meters and 5 centimeters. All lanes should be the same width. The length of the first lane shall be measured according to the provisions of paragraph 2 above, and the length of other lanes shall be measured at a distance of 20 cm from the outer edge of the inner lane.
6. Positioning: In order to draw lines accurately, four semicircle tangents and two centers on the runway field are marked with firm and obvious signs.
7. Drainage: The drainage system must be drained two hours after the rainstorm. In frozen soil area, it is best to add geotextile buffer layer between asphalt layer and gravel layer. Special waterproof treatment should be adopted for the foundation of drainage ditch.
8. Strength and stability: the foundation should have certain strength and stability, the surface should be uniform and firm, there should be no cracks and rotten edges, and the joints should be straight and smooth. The compactness of cushion is greater than 95%. After the medium-sized road roller is compacted, there are no obvious wheel tracks, loose floating soil and waves.
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