Prestressed concrete pile widely used in the engineering market. With advantages of low cost, easy construction, good quality control, durability and others, but there are still 3 disadvantages at the upper, middle and lower ends of pile. Prestressed piles are precast in shop, the material is bulky, difficult to transport, limited in the length of a single section. Naturally, It has to use connections to extend the total length.

    Today, the connection of prestressed concrete pile is mostly in the form of welding at end-plates. It is a good method of effective connection in the short period, and easy to construct in field. The strength of connection can be quickly formed (by welding). However, in the view of structural engineering, due to the corrosion at the end-plates, welding, end of deformed bars corrosion, the pile-connection should be fail. So many important structures/buildings do not accept the type of pile-connection. The main reason is still durability, and loss of tensile bearing.

    In the improvement of mid-end disadvantage (pile-conection), the P2 technology that inherited from P1: DH quick concrete pile technology can joint 2-piles to be a complete reinforced concrete structure, with more corrosion-resistant durability benefits. The P2 technology pre-embedded horizontal reinforcement at the ends of 2-pile in the factory, combined with vertical reinforcement, concrete in site so that the pile can stand for more compressive, tensile, durable, etc.

Pile connection diagram (site construction):

The following table shows the estimated tensile strength at the pile-connection (varies with usage):

The DH-PHC prestressed pile technology overcomes the most vulnerable prestressed pile joints and pile head nodes, the prestressed pile technology at least 50 years ahead, far ahead of the world's prestressed pile technology. After overcoming the weaknesses of the pipe piles, DH-PHC fully exerts the material properties of prestressed concrete to the fullest, and further uses the pre-stressed piles in more engineering fields. The pre-stressed piles industry will immediately see Larger market, and expansion of business opportunities.

 "DH-PHC pile technology in the pile joints and the node"
Li Shengnan / Dehan Intell. Technology Co., Ltd. 2014-3-26 Posted on
The 4th China International Piles and Deep Foundation Summit (Shanghai)

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Reference:

1. Zhang(2013), "Application of pile head treatment technology of DH-PHC drilling embedded prestressed pile," Proceedings of the 3rd China International Pile & Deep Foundation Summit, Shanghai. Download: (Traditional Chinese/Translated), (Simplified Chinese)
2. Li, Zhang and Liu (2014), "The Latest Application of DH-PHC Pipe Pile Technology in Pipe Pile Joints and Pile Head Nodes," Proceedings of the 4th China International Pile & Deep Foundation Summit, Shanghai. Download (Traditional Chinese/Translated), (Simplified Chinese)
3. Yu (2015), "A large number of DH-PHC composite concrete piles to reduce costs and its rapid method", Proceedings of the 5th China International Piles and Deep Foundation Summit, Shanghai. Download: (Traditional Chinese/Translated), (Simplified Chinese)
4. Li (2016), "Improvement of prefabricated pile head joints - Case of collapse of Shanghai Tower", Asia Pacific Urban Construction Forum 2016, Hong Kong. Download: (Traditional Chinese) , (Simplified Chinese/Translated)
5. Li (2016), "The Development of DH Quick Concrete Pile and Its Application in Industrial Rapid Construction", Dehan website, Taiwan.
   Download: (Traditional Chinese) (Simplified Chinese/translation)