







Pile head wire is a key component used in pile foundation engineering to connect the pile body with the upper structure (such as the bearing platform, connectors) or enhance the bearing performance of the pile body end. Through a threaded structure, it achieves efficient force transmission, pull-out and shear resistance, and construction convenience. The following provides a detailed description from the dimensions of functional positioning, structural classification, technical parameters, application scenarios, selection principles, common problems, and solutions:
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The core function of pile head wire
1. Mechanical connection and force transmission
By using threaded engagement, the pile body (such as precast concrete piles, steel pipe piles) is rigidly connected to the bearing platform, adapter or anchoring device to ensure the coordinated force bearing of the pile bearing platform system.
Data: The efficiency of threaded connections can reach over 90%, far higher than traditional welding or grouting connections (about 60%~70%).
Example: In a single pile foundation for offshore wind power, the connection between the pile head wire and the flange can withstand a vertical load of 1000 tons and a horizontal shear force of 50 tons.
2. Anti pull and anti shear reinforcement
The thread profile design (such as trapezoidal thread, serrated thread) can significantly improve the frictional resistance between the pile and the soil/concrete, and is suitable for scenarios such as anti floating piles and anchor piles.
• Testing: The pull-out bearing capacity of threaded pile heads is 3-5 times higher than that of smooth pile heads (such as the increase in pull-out capacity from 200 tons to 600-1000 tons for a diameter 800mm pile).
3. Optimization of construction efficiency
Eliminating on-site welding, grouting and other processes, installation can be completed by twisting, shortening the construction period by more than 50%.
Case: A 30 story residential project adopts prefabricated pipe piles and threaded pile heads, and the foundation construction period is compressed from 45 days to 20 days.
4. Quality controllability
Prefabricated threads in the factory can ensure tooth profile accuracy (such as pitch error ≤± 0.1mm), avoiding connection failure caused by on-site construction errors.
Comparison: The qualification rate of manually engraved threads on site is only 70%, while prefabricated threads can reach over 99%.
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