A
prestressed concrete pile is a type of deep foundation element made of concrete in which internal stresses are intentionally introduced before any external loads are applied. These stresses are created by tensioning high-strength steel tendons within the concrete to counteract the stresses that will result from service loads.
Key Features:
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Material: High-strength concrete and high-tensile steel tendons.
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Shape: Typically square, rectangular, circular, or octagonal cross-sections.
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Length: Can be precast in standard lengths and joined to reach the required depth.
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Prestressing Method:
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Pretensioned: Tendons are tensioned before casting the concrete.
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Post-tensioned: Tendons are tensioned after the concrete has hardened (less common for piles).
Advantages:
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Higher load-carrying capacity due to prestressing.
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Reduced risk of cracking, improving durability.
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Lightweight relative to capacity, making handling and transport easier.
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Longer spans and pile lengths without splicing.
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Resistant to environmental degradation, especially with proper concrete cover.
þ Applications:
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Bridges and highways
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Marine structures (wharfs, docks, jetties)
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High-rise buildings
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Industrial facilities
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Soil with low bearing capacity
