Drilling and pouring pile foundation: it is more convenient to form a hole, and the top surface of the foundation can be adjusted according to the terrain, the top elevation is easy to control, the amount of concrete reinforcement is small, the amount of excavation is small, the construction is fast, and the damage to the original vegetation is small. However, there are holes and pouring in the concrete site, which is suitable for general filling, clay, silt, sand and so on. Steel spiral foundation: convenient for forming holes, can adjust the top surface elevation according to the terrain, not affected by groundwater, construction as usual under winter climatic conditions, fast construction, flexible adjustment of elevation, very little damage to the natural environment, there is no filling and digging project, the damage to the original vegetation is small, and there is no need for field leveling. Suitable for deserts, grasslands, tidal flats, next door, frozen soil, etc. However, the steel used is large and is not suitable for strongly corrosive foundations and rock foundations.
Independent foundation: strong water load resistance, flood resistance and wind resistance. The amount of reinforced concrete required is large, there are many labors, the amount of earthwork excavation and backfill is large, the construction period is long, and the damage to the environment is large. It has been rarely used in photovoltaic projects. Reinforced concrete strip foundation: This type of foundation form is mostly used in the foundation bearing capacity is poor, suitable for the site is relatively flat, the groundwater level is low, the uneven settlement requirements of the flat single axis tracking photovoltaic bracket.
Prefabricated pile foundation: prestressed concrete pipe pile with a diameter of about 300mm or square pile with a cross-section size of about 200 * 200 is driven into the soil, and the top reserved steel plate or bolt is connected with the upper bracket front and back columns, the depth is generally less than 3 meters, and the construction is relatively simple and fast. Drilling pile foundation: the cost is low, but the soil layer requirements are higher, suitable for a certain degree of compactness of the silt or plastic, hard plastic silty clay, not suitable for loose sandy soil layer, the soil is harder pebbles or gravel may not be easy to make holes.
Steel spiral pile foundation: the use of special machinery to screw it into the soil, the construction speed is fast, no site leveling, no earth and no concrete, great protection of the vegetation in the field, the height of the bracket can be adjusted with the terrain, and the spiral pile can be reused. Cement counterweight method: pouring cement piers on cement roofs, which is a common installation method, has the advantage of being stable and not damaging the roof waterproof. Prefabricated cement counterweight: It is more time-saving than making cement piers, saving cement buried parts.
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