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“3 nuts” refer to three M12 specification welding nuts, and “2 washers” are mostly 50×50 specification washers. Both together with the pile pipe body and spiral blades form the whole. The welding design of nuts and washers can avoid loosening during installation and use, and improve the tightness of connection with upper structures such as photovoltaic brackets.
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Common models on the market, such as 76x4x1900, correspond to pipe body diameter 76mm, wall thickness 4mm, length 1900mm, and the matching spiral blade is full-circle 228mm with wall thickness 5mm. The material is mostly Q355B steel, which has higher strength than ordinary Q235 steel and can ensure the bearing foundation of the pile; at the same time, the surface will be hot-dip galvanized, with an average zinc layer thickness of 85 microns, so as to enhance corrosion resistance and extend service life.
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It inherits the general advantages of spiral piles, which can be screwed into the ground by special equipment without tedious excavation and waste soil treatment procedures. Its structure is suitable for various formations such as sandy soil and cohesive soil, and can achieve precise positioning in large-scale foundation construction such as photovoltaic power stations, improving construction efficiency.
