Selection and Experimental Study of Photovoltaic Bracket Foundation in Desert Areas
In order to study the suitability of pre-stressed pipe piles,pre-formed hole grouting anchor piles and steel spiral piles as the founda-tion form of photovoltaic support piles in desert areas,this paper takes a photovoltaic new energy project in desert areas as an example.Based on the original construction site test,three different photovoltaic pile foundation forms of pre-stressed pipe piles,pre-formed hole grouting anchor piles and steel spiral piles are compared and analyzed from the aspects of construction technology and single pile bearing capacity.A more suitable photovoltaic support pile foundation form for desert areas is proposed.The results show that the pile body of the pre-stressed pipe pile adopts a prefabricated structure,the pile body has good integrity,and the construction is relatively simple and the construction quality is relatively easy to control,and the construction efficiency is higher;the drilling speed of the steel spiral pile should be controlled during the construction process to ensure the quality of the pile;the quality control of the pile body of the pre-drilled grouting anchor pile is more difficult during the pile formation process;the compressive,tensile,and horizontal bearing capacities of pre-stressed pipe piles are generally high,all of which can meet the load requirements of photovoltaic support foundations.The tensile bearing capacity of pre-drilled cast-in-place piles is low and does not meet the upper load requirements.Due to the material of the pile body,the horizontal bearing capacity of the steel spiral pile is relatively low.However,it can be selected according to the actual load requirements.Compared with the other two pile types,the pre-stressed pipe pile is more suitable for use in desert areas in terms of construction and bearing capacity.The test results are of reference significance for the design of photovoltaic pile foun-dations in desert areas.