From：Solar module installation structure made in china Release time：2018-11-08
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01. Reinforced concrete independent foundation
The reinforced concrete independent foundation is respectively set under the front and rear columns of the pv bracket, which is composed of the foundation floor (cushion) and the foundation short column above the floor. The embedded parts (steel plate or anchor bolts) are arranged on the top of the short column, which are connected with the photovoltaic supports in the upper part, requiring a certain depth of burial and a certain area of foundation base. The foundation floor is covered with soil, and the uplift force caused by environmental load is resisted by the gravity of foundation and the gravity of foundation overburden, and the downward vertical load of pv bracket is dispersed by the large area of foundation bottom, and the friction between foundation bottom and soil as well as the resistance between foundation side and soil to resist the horizontal load.
The method of force transmission is clear, the force bearing is reliable, the scope of application is wide, the construction does not need special construction machinery, the ability of resisting horizontal load is strongest, resisting flood and resisting wind.
The amount of reinforced concrete required is large, the labor is much, the amount of earthwork excavation and backfill is large, the construction period is long and the damage to the environment is great. The limitations of this foundation are so great that today's photovoltaic power stations are rarely used.
02. Reinforced concrete bar foundation:
By setting the foundation beam between the front and rear columns of the pv bracket, the center of gravity of the foundation was shifted to the front and rear columns, and the anti-overturning force arm of the foundation was increased. The contact area between bar foundation and foundation soil is large, which is suitable for the area with flat site and low underground water level. Since the surface area of the foundation is relatively large, the depth of burial is generally between 200 and 300mm.
Earthwork excavation volume is small, do not need special construction tools, simple construction process.
Large area of the field is required, which has a great impact on the environment, a large demand for concrete, and a long curing period, requiring much labor. The buried depth of foundation is not enough to resist flood water.
03. Screw steel pile foundation:
The hot-dip galvanized steel pipe pile with spiral blade is adopted under the front and rear columns of the pv bracket. The rotating blade can be large, small, continuous and discontinuous, and continuous welding is adopted between the rotating blade and the steel pipe. Professional machinery is used to screw it into soil during construction.
The upper part of the spiral pile foundation is exposed to the ground, and the upper support is connected with the screw rod. Through the lateral friction resistance between the pile side of steel tube and soil, especially the bite force between rotating blade and soil to resist the uplift force and bear vertical load, the pile and soil interaction between spiral blade and soil can be used to resist the horizontal load.
Rapid construction speed, no site leveling, no earthwork excavation, maximum protection of the vegetation in the site, and easy to restore the original site, easy to adjust the upper support, can adjust the support height along with the terrain. The effect on the environment is small, less labor is needed, and the spiral pile can be reused.
The cost is relatively high and special construction machinery is needed. The most important thing is that the horizontal bearing capacity of foundation is closely related to the compactness of soil layer. The spiral pile foundation requires a certain compactness of soil layer. The spiral pile foundation has poor corrosion resistance. Although thick hot galvanizing can be adopted, it is difficult to adapt to strong corrosive environment.