The following are the construction steps for ground-mounted basketball hoops (in-ground type) provided by Cangzhou Haoran Sports Equipment Co., Ltd., compiled with professional specifications and practical points:

I. Site Preparation and Measurement

* **Positioning and Marking:** Using a steel ruler and chalk, mark the center point of the basketball hoop 60 cm outside the end line of the basketball court (error ≤ 2 cm), ensuring compliance with FIBA standards.

Align the center of the pre-embedded pit with the marked point. The edge of the pit should be ≥ 50 cm from the court boundary to avoid encroachment on the court during concrete pouring.

**Excavating the Pre-embedded Pit:**

* **Dimensions:** 70cm long × 70cm wide × 80cm deep (adjust according to the basketball hoop model; for example, if the arm span is long, the depth needs to be increased to 1 meter).

**Construction Points:** The pit walls should be vertical, the bottom flat, and all debris removed. If the soil is soft (e.g., backfill soil), the pit needs to be enlarged or the foundation reinforced.

II. Installation and Fixing of Embedded Parts

* **Positioning of Embedded Parts:** Place the embedded parts (including anchor bolts) into the pit, adjust to a horizontal position, and verify with a laser level; error ≤ 3mm. The center of the embedded part coincides with the center of the pit, and the verticality deviation of the anchor bolts is ≤1°.

Concrete Pouring

Material Selection: Use concrete of grade C30 or higher, with an early-strength agent (such as sodium sulfate) added to accelerate curing.

Pouring Process: Compact in layers with vibration, each layer ≤30cm thick, avoiding honeycomb and pitted surfaces; pouring height slightly above ground level to create a natural drainage slope (≥2%).

Curing Period: Cover with plastic film for moisture retention curing, curing period ≥4 days (extended to 7 days in winter), during which time stepping on or installing the main structure is prohibited.

III. Basketball Hoop Main Structure Installation

Column Hoisting: Use lifting equipment to slowly hoist the column into the embedded pit, align the anchor bolts, and initially fix the nuts (do not tighten).

Adjusting Column Verticality: Check with a plumb line or total station; error ≤5mm; if the column is tilted, readjust the embedded parts or add shims for correction.

Secondary Reinforcement

Erect temporary support frames (such as steel pipe scaffolding) around the pillars, with support points ≥1.5 meters above the ground to ensure pillar stability.

Fill with concrete until level with the ground, compact again with vibration, and smooth and polish the surface for seamless integration with the court.

IV. Backboard and Hoop Assembly

Backboard Installation

Tempered glass backboard: Utilizes a 5-point load-bearing design, secured with M12×60 high-strength screws. The torque value of each screw should be controlled between 40-50 N·m (must be checked with a torque wrench).

Support Point Protection: Rubber pads (≥3mm thickness) are placed on the contact surfaces of the backboard, extension arm, and rim to reduce vibration noise and prevent glass breakage.

Angle Adjustment: The verticality error of the backboard should be ≤3° to ensure a normal shooting rebound trajectory.

Hoop Adjustment

The rim height from the ground is 3.05 meters (standard height), with an error of ±2cm; if it is an adjustable model, the adjustment device must be locked to prevent loosening.

Install the basketball net and check the rim's elasticity: The free-fall rebound height should be ≥1.2 meters, and the rim should show no obvious deformation.

V. Safety Inspection and Acceptance

Stability Test

Simulate basketball impact: Forcefully slap the backboard or impact the rim to check if the basketball hoop shakes; if the shaking amplitude is >5mm, the foundation needs to be reinforced or the uprights adjusted.

Test the tightness of the anchor bolts: Use a torque wrench to check each bolt individually to ensure there is no looseness.

Functional Adjustment

Adjust the backboard angle: Adjust the bracket bolts to ensure the backboard's verticality error is ≤3°.

Check the rim's rotation flexibility (if it is a rotatable model): Manually rotate the rim; there should be no jamming or abnormal noise.

Acceptance Standards

Complies with GB 19271-2011 General Safety Requirements for Basketball Hoops; an installation report and warranty documents must be provided.

Acceptance items include: foundation strength, upright verticality, backboard stress uniformity, rim height and elasticity, etc.

VI. Maintenance and Care

Daily Inspection: Inspect the concrete foundation monthly for cracks and anchor bolts for rust. Repair any problems promptly.

Cleaning the Backboard: Wipe with a neutral detergent. Avoid using acidic or alkaline solvents to prevent glass corrosion.