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Service Life of Screw Piles



Screw piles play a vital role in modern construction, providing significant strength and adaptability to various climatic conditions. Although some manufacturers often claim service lives of 120 years or more, practical conditions and various factors can lead to deviations from these estimates.

Main Factors Affecting the Service Life of Screw Piles

1. Effect of Material and Corrosion: The longevity of screw piles is primarily determined by the corrosion rate, which in turn depends on the quality of the steel and the corrosivity of the soil. The service life of screw piles is affected by both chemical and electrochemical corrosion, while the corrosion rate is influenced by pH, moisture, and soil type.

2. Physical Characteristics: The thickness of the pile blade and shaft is critical; even a slight increase in these dimensions can significantly extend the service life of the pile. Installation depth also affects service life, as deeper installation can slow chemical corrosion. 3. Protective Technologies: The use of anti-corrosion treatments, such as zinc coatings and polymer-based solutions, is essential for extending the service life of helical piles. The effectiveness of these treatments depends on the application method and environmental conditions.

4. Professional Installation and Load Distribution: Improper installation or excessive loading can significantly reduce the service life of helical piles. It is crucial to ensure professional installation and compliance with load requirements.

5. Compliance with Standards: Compliance with standards during pile manufacturing is essential. These standards define the requirements for the manufacture and use of helical piles, including dimensions, materials, and protective measures. Standards ensure that piles meet the necessary quality and safety requirements, which directly impacts their service life.

Realistic Service Life and Measures to Extend It

The realistic service life of helical piles is typically 65 to 85 years, depending on soil type, climate, and maintenance. Increasing the metal thickness, using alloy steel, and applying durable anti-corrosion coatings can help extend their effectiveness. Despite advances and protective measures, it's important to understand that all building materials, including screw piles, are subject to natural deterioration over time.

Screw piles are a critical element of a pile foundation, the longevity of which is influenced by the quality of the material, environmental factors, and proper maintenance. Understanding these aspects and taking proactive measures for protection, professional installation, and compliance with standards can effectively extend the service life of screw piles, ensuring a strong and durable foundation for buildings.

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