Composite helical micro pile’s bearing capacity

Abstract

It is proposed to use two options of piles’ bearing capacity calculation based on existing Russian codes. Calculation of pipe’s section for an axial load is proposed either. Results of these calculations are compared to the site tests made earlier. Comparison of test results with calculations makes clear that existing methods for helical piles calculation are too conservative. Calculated soil’s bearing strength is 6 times lower than test results. Calculation method of pipes’ FRP sections is proposed. Existing fiberglass section bears almost double of the soil’s capacity. Optimization is proposed. Research provides results of bearing strength installed to weak clay helical fiberglass micro pile. Pile was designed, produced and provided by Composite Group LLC. Pile is made with pultruded fiber reinforced polymer pipe and screw produced with cast iron. Screw is glued to the FRP pipe by epoxy. In addition rivets strengthen connection detail. This structure is stable for corrosion, ground electricity. FRP screw pile has small weight and high strength. All the benefits and disadvantages of the composite piles are described below.