The dimensions of outdoor ground-mounted adjustable Vietnambasketball hoops in China must strictly adhere to national standards to ensure safety and applicability. Specific dimensional requirements are as follows:
I. Core Structural Dimensions
Backboard Dimensions: Standard specifications: 1800mm (1.8m) width, 1050mm (1.05m) height, thickness ≥10mm (tempered glass backboard).
Lower edge height from the ground: 2900mm (2.9m), ensuring the relative position of the backboard and rim conforms to FIBA standards.
Aiming Area: A 590mm × 450mm rectangular aiming area must be drawn in the center of the backboard, with a 50mm wide border and 150mm from the edge of the backboard, to aid in shooting aim.
Rim Dimensions:
Inner diameter: 450mm (45cm), made of solid round steel (diameter ≥17mm).
Height: The upper edge of the rim is 3050mm (3.05m) from the ground, which is the internationally accepted standard height (youth Vietnambasketball hoops can be adjusted to 2.7-2.9 meters). Elasticity Requirements: The rim must possess a certain degree of elasticity. When 15-20 kg of pressure is applied, the sinking amount should be between 7-10 mm, and it should immediately return to its original position after unloading to avoid affecting shooting feedback.
Arm Extension Length: Standard range: 2250 mm (2.25 m) to 3350 mm (3.35 m). The specific selection needs to be determined based on court conditions and usage requirements.
Basic Educational Facilities: Typically uses a 2250 mm arm extension, suitable for courts with limited space.
Professional Courts: Uses a 3350 mm arm extension, providing a longer shooting distance and more room to maneuver.
Post and Base Dimensions: Distance from the bottom of the post to the back of the backboard: ≥1200 mm (1.2 m), to prevent athletes from colliding with the post.
Post Cross-Section Diameter/Side Length: Typically 100-150 mm, ensuring structural stability.
Base Dimensions:
* Fixed Base: Requires a counterweight of ≥400 kg (concrete or cast iron), with embedded parts measuring 600mm × 600mm × 1000mm (length × width × depth).
* Movable Base: Volume ≥0.5 cubic meters (counterweight required after water/sand filling), typically 2000mm × 1000mm × 340mm (length × width × height).
II. Material and Process Requirements
* Backboard Material:
Tempered Glass: Thickness 10-12mm, edges polished for scratch resistance, high impact resistance, high transparency.
* SMC Composite Material: UV resistant, suitable for budget-constrained scenarios (e.g., communities), but service life ≥5 years.
* Hoop Material:
High Carbon Steel (Q235 grade or higher): Surface galvanized or powder-coated, rust prevention level ≥ GB/T 13912 standard.
* Support and Crossbar Material:
Seamless Steel Pipe: Wall thickness ≥3mm, welds require flaw detection, surface electrostatic powder coating (weather resistance ≥5 years). Base Material:
Cast Iron (Mobile): Leak-proofing treatment required.
C30 Concrete (Fixed): Curing time ≥ 28 days to ensure strength meets standards.
III. Installation and Safety Specifications
Embedded Parts Construction:
In-ground Vietnambasketball hoop: Excavate a 600mm×600mm×1000mm pit, pour concrete for fixation, and erect the main structure after 3-5 days of curing.
Mobile Vietnambasketball hoop: The base needs to be filled with water/sand until the counterweight meets standards to prevent tipping.
Levelness Correction: During installation, use a spirit level to test around the Vietnambasketball hoop's tube walls to ensure the frame is level and avoid tilting that could cause safety hazards.
Backboard Stress Balance: When installing a tempered glass backboard, all five connection points must be on the same plane to ensure even stress distribution. The extension arm, backboard, and rim must be in a straight line, but the extension arm and rim must not contact the backboard.
Corrosion Protection Treatment: Outdoor Vietnambasketball hoops require a triple anti-corrosion treatment: pickling, phosphating, and electrostatic powder coating. The coating thickness is ≥60 micrometers, and the salt spray resistance test is ≥48 hours.
