ground screw pile

Q1: What is a ground screw pile?

A: A ground screw pile, also known as a screw pile or helical pile, is a steel foundation pile with helical blades welded near the tip. It is rotated directly into the ground using a hydraulic pile driver, providing a stable load-bearing foundation without any concrete excavation or curing.

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Q2: How does a ground screw pile work?

A: The pile is screwed into the ground similar to driving a screw into wood. The helical blades cut through the soil while the pile shaft carries the structural load. The surrounding soil compresses against the blades, creating strong resistance against both downward compression and upward pull-out forces.

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Q3: What materials and finishes does Leili offer?

A: Leili ground screw piles are manufactured from Q235 or S235 carbon steel with hot-dip galvanized surface treatment, providing a coating thickness of 80 to 100 microns. This ensures excellent corrosion resistance and a service life of 20 to 25 years. CE, ISO, and TUV certifications are available upon request.

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Q4: What sizes are available?

A: Standard pipe diameters include 76mm, 89mm, and 114mm, with wall thicknesses ranging from 2.5mm to 4.0mm. Pile lengths are customizable from 550mm up to 6,000mm. Flange dimensions are typically 200mm or 220mm in diameter with 8mm thickness, and custom sizes can be manufactured to meet your project specifications.

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Q5: What types of ground screw piles does Leili offer?

A: Leili offers five main configurations. The flange ground screw comes with a pre-welded flange plate for easy connection to solar mounting structures, making it the most common choice for standard solar racking foundations. The big-blade screw pile features larger helical blades for enhanced grip in soft or loose soil conditions. The small-blade screw pile has compact threads designed for dense or rocky ground where extra cutting force is needed. The adjustable screw pile incorporates a telescoping design that allows height adjustment on sloped or uneven terrain. Finally, the flangeless screw pile has no flange plate and is intended for specialized mounting requirements where direct welding or other connection methods are preferred.

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Q6: What are the main advantages over concrete foundations?

A: Ground screw piles offer several significant benefits. Installation takes only about two minutes per pile compared to concrete which requires days for curing. The total project cost is roughly half that of a concrete foundation. No excavation or soil disposal is needed, eliminating waste and reducing site disturbance. Installation is not weather dependent, so work can continue in cold conditions where concrete would fail to cure properly. Ground screw piles are also fully removable and reusable, allowing for easy relocation or adjustments. Finally, they have minimal environmental impact with no cement leaching or chemical contamination of the surrounding soil.

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Q7: What is the load-bearing capacity?

A: Load capacity depends largely on soil conditions, pile dimensions, and installation depth. For reference, a 76mm by 4mm by 1200mm pile typically provides around 25 kilonewtons of compressive load capacity and 12.5 kilonewtons of pull-out resistance. A larger 114mm by 4mm by 2000mm pile can deliver approximately 66 kilonewtons in compression and 38 kilonewtons in uplift resistance. For actual project planning, Leili recommends conducting a site-specific geotechnical survey to determine the optimal pile size and depth for your soil conditions.

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Q8: How are ground screw piles installed?

A: The installation process involves three main steps. First, a site survey is conducted to determine the optimal pile length and depth based on soil conditions. Second, the layout is marked using precision surveying instruments to ensure accurate positioning. Third, a hydraulic pile driver—such as Leili's LLE12 or L-350 models—rotates the pile vertically into the ground. The actual driving time typically ranges from 30 to 75 seconds per pile, making large-scale solar farm installations remarkably fast and efficient.

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Q9: What are the primary applications?

A: Ground screw piles are most commonly used for solar photovoltaic mounting system foundations, which is their primary application. They are also widely used in agricultural fencing and vineyard trellises, lighting poles and traffic signs, container houses and temporary buildings, playground and park structures, as well as wind turbines and communication towers.

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Q10: Can I get custom sizes and specifications?

A: Absolutely. Leili Machinery offers full customization including pipe diameter, wall thickness, total length, blade configuration, flange size and shape, and surface treatment. Simply provide your project requirements, soil conditions, and load specifications, and Leili will engineer a tailored solution.

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Q11: Why choose Leili Machinery for ground screw piles?

A: Leili uses premium Q235 carbon steel with hot-dip galvanization for exceptional durability. All products are fully customizable to match your specific project requirements. The piles are perfectly compatible with Leili's full range of solar pile drivers, ensuring seamless installation. Every product undergoes rigorous quality control and comes with CE, ISO, and TUV certifications upon request. With over ten years of experience serving international solar markets, Leili has the expertise to support projects of any scale.

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Q12: How can I get a quote or place an order?

A: Contact Leili Machinery directly using the information below. For an accurate quotation, please specify your required pile dimensions, quantity, soil conditions, and any special requirements.

Henan Leili Machinery Manufacturing Co., Ltd.

Address: Gongyi City, Yong'an Street Office, Yongyi Road No.1, Building 7, Zhengzhou, Henan, China

Phone: +86 18339980828

Email: 1727586610@qq.com

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For technical data sheets, load calculation reports, or sample orders, please contact our sales team directly.