spiral ground piles are consists of one or more spiral blades welded on the central axis, which are one circle of Archimedes'spiral. Spiral soil nails are widely used in front of bridge abutments where highway slope stability or deformation requirements are low. Different from the action mechanism of bolts, spiral soil nails are mainly used to reinforce the soil behind retaining walls or slopes, providing passive resistance caused by soil deformation and movement, thereby achieving the purpose of reinforcement. Spiral soil nails use a series of spiral blades welded to steel pipes at equal intervals to strengthen the soil behind the wall or slope. The wall or slope does not require a high-strength steel structural surface. The load-bearing capacity of the spiral pile mainly depends on the part of the pile body where the spiral blades are welded. The part of the pile body above the top blade has little effect on the load-bearing capacity of the pile. Such structural characteristics give the spiral pile foundation economic advantages in special areas where highways pass, including expansive soil areas, permafrost areas and collapsible soil areas.
spiral ground piles are used for shallow water foundations, coastal lighthouse foundations, coastal levees and dock foundations and bridges, and are also widely used for riverbank reinforcement and building foundations in almost every corner of the world, including the United States. In those days, helical ground piles were mainly made of cast iron or steel, both of which were abundant at the time, especially in Britain and the United States.
Whether now or in the future, as spiral ground piles continue to develop new uses in new fields, their application prospects are becoming brighter and brighter. Spiral pile foundations are an attractive alternative to cast-in-place pile foundations. Since helical ground piles are designed to hold axial compressive and tensile loads, as well as transverse tensile loads, they can also be used to repair existing building structures, such as those damaged by natural disasters such as earthquakes, floods, and typhoons. It can also be used as the temporary foundation for building temporary houses and mobile homes, or temporary houses for disaster relief, temporary bridges, etc. Spiral ground piles in larger formats and sizes are also becoming more common for heavy-duty foundations.