What are the key quality inspection items for a plastic track and field surface?
The quality inspection of a plastic track field’s base layer typically includes visual inspection and testing of physical and mechanical properties.
Visual inspections focus on several aspects: the uniformity of the surface color, the firm adhesion of rubber particles, the bonding strength between the top plastic layer and the base, the presence of any hollow areas, and whether the thickness meets the design specifications.
For physical and mechanical testing, samples measuring 500mm × 500mm × actual thickness are used. Common tests include hardness (Shore A), tensile strength, pull-out defect length, compression recovery, rebound value, and flame resistance. In large-scale standard venues, additional IAAF-recommended tests may be required, such as buffer performance, vertical deformation, friction, tensile strength at break, and elongation at break.
How can you measure the thickness, slope, and distance of a plastic track and field?
**Thickness Measurement:**
On-site measurements are taken using a thickness gauge (such as a three-needle detector). For ultra-thin sections (less than 10mm), a core sampling method is used. A 20–25cm diameter core is extracted, polished, and then measured with a high-precision thickness gauge (0.01mm accuracy) using a 4mm plunger and a 0.8–1.0N tester to ensure accurate results.
**Slope Measurement:**
A level gauge is used for both cross-slope and longitudinal slope testing. For cross-slope, the height difference between the highest point of the inner lane and the outermost edge is measured. The ratio of this difference to the horizontal distance gives the actual slope. This is compared to the designed slope.
For longitudinal slope, two points along the runway direction are measured, with a minimum distance of 40m between them. The height difference is divided by the horizontal distance to determine the slope, which is then compared to the design value.
**Distance Measurement:**
Straight segments are measured using a laser rangefinder in parallel directions. For curved sections, a theodolite is used to mark every 5 degrees, and the radius of each lane is measured from the center point. The distance between the centers of the lanes is also checked against the design values.
The calculated 400m distance must not have a negative error, with an allowable tolerance of 1/10,000. That means a 400m track can have a maximum positive error of 4cm, and a 100m track can have up to 1cm error. These standards ensure the track meets international competition requirements.
Bird Nets
Bird netting or bird netting is a form of bird pest control. It is a net used to prevent birds from reaching certain areas.
Bird netting comes in many shapes and forms, the most common being small mesh (1 or 2cm square), made from extruded and bidirectional polypropylene or woven polyethylene.
The most commonly used colors are black, white or green bird netting
Professional bird netting comes in large rolls, saving the farmer or aquaculturer a lot of money. Retail chains and local stores will offer smaller packages to meet the needs of backyard gardeners.
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