1.Basic features and scope of application

Screw pile foundation is connected with one or more spiral blades on the steel pile rod, and by applying torque on the top of the pile foundation, the pile foundation is screwed and drilled into the soil to form a foundation that can withstand vertical and horizontal loads.

The advantage of this type of foundation is that it can be processed in the factory and the quality is easy to control; the photovoltaic support can be installed immediately after the foundation construction is completed, reducing the overall construction cycle; when the photovoltaic power station reaches the design limit, the steel ground screw piles can be recycled, and at the same time The foundation of the site can be thoroughly cleaned up and it is easy to restore vegetation. The disadvantage is that the hard particles in the soil may cause damage to the foundation anticorrosive layer during construction.

The applicable rock and soil conditions for screw pile foundations are residual soil, fully weathered rock soil, gravel gravel soil, gravel gravel soil, round gravel gravel soil, breccia gravel soil, sand, silt, flow plastic ~ soft Plastic clay and plastic ~ hard clay.

2.Basic design

   Ground screw pile foundation can bear vertical force and horizontal force. When estimating the characteristic value of its vertical bearing capacity, the perimeter of the pile can be 0, πD (D is the diameter of the spiral pile blade) or πd (d is the diameter of the pile) according to the position of the pile in the soil; When estimating the characteristic value of the horizontal bearing capacity of the screw pile foundation, the diameter is taken as d.

screw pile foundations often adopt a double-row foundation layout, and the loads they receive are mainly uplift and horizontal loads[4]. Therefore, when calculating this type of foundation, the calculation is generally based on the screw pile foundation under air suction conditions. The pull resistance is used to determine the geometric parameters of the steel pipe piles in the foundation, and then the horizontal bearing capacity and compressive bearing capacity of the foundation are checked.

Jesfer specializes in the production of more than a dozen types of groud screws piles, with rich experience, and has been sold all over the world and has been praised by customers. jesfer ground screw piles are mainly used to serve solar photovoltaic systems, decks, light steel houses, farm sheds, landmark buildings, etc.