Product Summary

Longze Solar Ground Screws (also known as Helical Piles) offer a high-efficiency, concrete-free foundation solution for utility-scale and commercial ground-mount solar arrays. Manufactured

from high-tensile Q235B steel and protected by heavy-duty Hot-Dip Galvanizing (ISO 1461), our ground screws are engineered for rapid deployment and maximum load-bearing capacity in diverse soil conditions,

from loose sand to hard clay.

• ✔ Rapid Installation: Eliminates the need for excavation and concrete curing, reducing foundation installation time by over 70%.
  
  

• ✔ Superior Corrosion Resistance: Average zinc coating thickness of 80μm+, providing a service life that matches or exceeds the 25-year lifecycle of PV modules.
  
  

• ✔ Environmentally Friendly: 100% recyclable and non-disruptive to the local ecosystem, allowing for easy removal and site restoration.
  
  

• ✔ High Load Capacity: Precision-welded helical blades provide exceptional pull-out resistance and lateral stability.

Physical Dimensions & Specifications

• Standardized helical pile sizing for PV mounting structures.

• Model No.	Diameter (D)	Length (L)	Wall Thickness	Flange Type
  LZ-GS-76	76 mm	1200 - 2500 mm	3.0 / 3.5 / 4.0 mm	F / U / M / V
  LZ-GS-89	89 mm	1600 - 3000 mm	3.5 / 4.0 mm	Customizable
  LZ-GS-114	114 mm	2000 - 4000 mm	4.0 / 4.5 mm	Heavy Duty

Material Reliability & Technical Testing

• Verified structural performance for large-scale solar projects.

• Test Item	Standard	Technical Requirement	Result
  Material Grade	ASTM A36 / Q235B	Yield Strength ≥ 235 MPa	Passed
  Zinc Coating	ISO 1461 / HDG	Minimum 80μm Avg.	Verified
  Pull-out Force	Project Specific	Dependent on Soil Type	≥ 15.0 KN
  Weld Quality	AWS D1.1	Full Penetration Weld	Ultra-Tested

Avoid Pitfalls: Critical Risks in Solar Ground Screw Foundations

1. The "Cold Galvanizing" Fraud: Many suppliers offer "Zinc Plated" or "Cold Galvanized" screws to lower costs. In acidic or moist soil, these will rust through in 3-5 years. For a 25-year solar project, NEVER accept
   
   anything less than ISO 1461 Hot-Dip Galvanizing (80μm - 100μm average thickness). Always request a zinc coating thickness test report.
   
   

2.  Helix Weld Integrity (The "Pull-out" Risk): The helical blade is what holds your project down. "Spot welding" or "Tack welding" the helix to the pipe is a recipe for disaster in high-wind zones. Insist on Full-
   
   Circumference Continuous Welding (AWS D1.1 standard). If the helix snaps off during installation or a storm, the pile loses 90% of its pull-out resistance.
   
   

3.  Pipe Wall Thinning: To save steel, some factories use 2.75mm pipes but label them as 3.0mm. In hard soil, a thin-walled pipe will buckle or twist under the high torque of the hydraulic pile driver. Always verify
   
   the actual wall thickness with a micrometer before the screws leave the factory.
   
   

4.  Ignoring Soil Reports (Torque vs. Depth): A common mistake is stopping the installation once the screw reaches a certain depth. If the soil is too soft at that depth, the Installation Torque will be too low, and
   
   the pile will sink or pull out under load. You must monitor torque levels; if the ground is weak, you must use longer screws or larger diameter helices.
   
   

5.  Flange Misalignment: If the flange plates are welded slightly off-center or tilted, your Photovoltaic Brackets will not align. This leads to massive labor costs on-site as workers struggle to force the rails into place.
   
   Our flanges are secured in precision jigs before welding to ensure a ±1mm tolerance.
   
   

6.  Dissimilar Metal Corrosion (Galvanic): Never bolt aluminum brackets directly to the steel ground screw flange without an isolation gasket or proper washer. The chemical reaction will accelerate the corrosion of
   
   the aluminum, potentially compromising the structural connection of the entire array.
   
   

7.  "Blind" Installation near Utilities: Never drive a ground screw without a clear underground utility map. Striking a buried cable or pipe is not just a project delay—it’s a massive liability and safety hazard.

• Q: Can these ground screws be used in rocky soil?

  • A: Yes. For rocky terrain, we provide specialized Rock Screws with reinforced tips and thicker helical blades. We recommend pre-drilling a pilot hole for extremely hard rock formations to ensure precise alignment.
    
    
    

• Q: Are Longze ground screws compatible with all bracket brands?

  • A: Absolutely. Our ground screws feature a Universal Flange Design (F-Series). Whether you are using our own Photovoltaic Brackets or third-party racking, the bolt-hole patterns can be customized to match your specific mounting rails.