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Analysis of the causes of problems in sports flooring

1) All synthetic materials are based on high-standard foundation construction. The quality of the plastic foundation directly affects the quality of the plastic surface. Some construction units cut corners during the construction of the prefabricated elastic flat wood look indoor sport flooring, such as the imbalance of the proportion of the gray soil layer, which does not meet the requirements of the 37 soil; some loess has poor texture and sand and gravel, and is used without treatment; the inorganic mixture layer is informal. Some of the manufacturers’ products use low-grade products; the medium-grained stone-grained asphalt concrete is too thin and the surface is not flat; in addition, the tonnage of the road roller is small, and the number of rolling is small, which does not reach the specified compactness. This kind of foundation can not guarantee the service life of the plastic surface layer.
2) Site reference pile points are not accurate. After the site is repaired, the line is not allowed, and the distance of the game is not accurate, which has a great impact on training and competition. The reason for this is that the level of measurement technicians in the construction unit is poor, and the measurement is performed using a tape measure or an uncalibrated steel ruler, which causes the standard site data to be distorted.
3) The surface of the site is not flat and does not meet the flatness required by the rules of each sports program. As we all know, the prefabricated elastic flat PP mat sport flooring has no pores, so the requirements for inclination and level are very strict. Otherwise, there will be a pond at a low place, and the plastic surface layer will retain water for a long time, which will increase its aging degree and affect its use. life.
4) The plastic surface layer is not laid according to the design requirements and the thickness is not enough. For example, the track and field runway plastic should be 13mm thick, while some should only be about 10mm; the third-level long jump, pole vault, javelin-assisted runway and high jump take-off area should be 25mm thick, while some are not thickened or only about 18mm. Basketball and volleyball courts should be paved with 8mm, while some only have 5~6mm. Because the plastic surface is too thin, the softness is small, resulting in less elasticity. The impact of the foot on the ground during the athlete’s game increases, resulting in injury. happened.
5) The surface of the plastic is severely detached. There are two reasons for the separation: 1 In the plastic paving process, the technology is not skilled, and there is no good timing to sprinkle the particles. Because the timing of sprinkling the particles is related to the climate temperature and temperature at that time, it is determined immediately. The particles will sink in the early morning, and the particles will not bond well in too late; 2 Some construction units use the material fish to mix the beads, replace the polyurethane rubber particles with EPDM rubber particles, and the affinity of EPDM rubber and polyurethane plastic is poor. , the adhesion is not strong enough, causing the particles to fall off. Why use EPDM? From the shape, it is neatly cut, and the gloss is more beautiful than polyurethane, but it is much cheaper than polyurethane. In order to prevent the particles from falling, some construction units spray glue on the surface of the rubber particles, and the manufacturer brushes a thick glue. This seems to fix the particles on the surface layer, but this layer of glue forms a hard film and thus loses. The role of non-slip particles makes it easy for athletes to slip and fall when exercising. The International Federation of Athletics Associations Association’s track and field venue standards manual states: “An important requirement for athletics is to ensure that there is no slip between the athlete’s foot and the detachable futsal sport floor tiles of the field. This is the case in wet and dry conditions.” It is recommended that when playing the track and field sports floor, do not add a layer of glue to the surface of the anti-slip particles for the health of the students. In order to prevent the particles from falling off, a secondary laying synthesis process can be used, which ensures that about 95% of the particles will not be removed.
6) The plastic ingredients do not meet the relevant regulations of the National Sports Goods Quality Supervision and Inspection Center, causing the ratio to be seriously out of balance, resulting in premature aging and fracture of the plastic, which does not meet the quality standards of 8 to 10 years. In the plastic ingredients, Group A polyurethane is the main raw material, and its price is the most expensive. Group B consists of curing agent, color paste, flame retardant, anti-oxygen anti-UV agent and filler, among which filler talcum powder, clay and chlorinated paraffin (Liquid) The price is low. If the ratio of Group A and Group B exceeds 1:2.5~3, some indicators of the quality of plastic products will not reach the relevant standards. Some manufacturers reduce the amount of polyurethane, increase the amount of filler, and achieve the ratio. At 1:4 to 5, the quality of such plastics must be unqualified. There is also a kind of plastic filler called black granules, which is mainly processed from old rubber products. Its price is low, the ratio is about 20% to 25%, and some construction ratios are about 50%. Can not guarantee the quality. The problem described above will definitely appear.

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