A large-diameter irregular cross-section spiral pile suitable for soft soil layers

Abstract

This invention provides a large-diameter, irregularly shaped cross-section helical pile suitable for soft soil layers. The helical pile includes a pile body, helical blades, a pile tip, a reverse-helical pile cap, and a dual-liquid grouting system. The dual-liquid grouting system is prefabricated inside the pile body and can be locked with the helical blades. Addressing the problems of traditional helical piles being only micro or small piles, and the high consumption of steel and concrete and the lack of significant irregularity effect in existing improved helical piles, this invention proposes a large-diameter, irregularly shaped cross-section helical pile technology. Upon final penetration, a continuous section of concretized blades is formed along the path swept by the helical blades, thus achieving full coverage of helical blades in the pile body as in this invention. This can produce a significant longitudinal irregularity effect while reducing material costs, greatly improving the bearing capacity of the pile foundation. It can provide important technical support for future soft soil foundation treatment.

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