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List of advantages and disadvantages of the basic selection of photovoltaic power station photovoltaic brackets

Public number : Juguang High-tech Source: Time: 2020-02-21 01:54:12

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01 、 Reinforced concrete independent foundation

■ Definition:

Reinforced concrete independent foundations are respectively arranged under the front and rear columns of the photovoltaic support, and are composed of a foundation slab (a cushion layer) and a foundation short column above the slab. The embedded part (steel plate or anchor bolt) on the top of the short column is connected to the upper photovoltaic support, which requires a certain burial depth and a certain base area; the foundation floor is covered with soil, and the self-weight of the foundation and the gravity of the foundation are used to resist the environmental load The upward pulling force uses a large base area to disperse the downward vertical load of the photovoltaic support, and uses the friction between the base surface and the soil and the resistance of the side of the foundation and the soil to resist the horizontal load.

■ Advantages:

The force transmission path is clear, the force is reliable, the application range is wide, no special construction machinery is needed for construction, the ability to resist horizontal loads is the strongest, and it is resistant to floods and winds.

■ Disadvantages:

The required amount of reinforced concrete works is large, the labor is large, the amount of earthwork excavation and backfilling is large, the construction period is long, and the damage to the environment is large. This foundation is too limited and is rarely used in today's photovoltaic power plants.

02. Reinforced concrete strip foundation:

■ Definition

By setting up a foundation beam between the front and rear pillars of the photovoltaic support, the center of gravity of the foundation is moved between the front and rear pillars, and the foundation's anti-overturning force arm is increased. The self-weight can resist the overturning moment of the photovoltaic support caused by wind load; The contact area with the foundation soil is large, and it is suitable for areas where the site is relatively flat and the groundwater level is low. Because the surface area of the foundation is relatively large, it is generally buried between 200 and 300 mm.

■ Advantages:

The earthwork excavation is small, no special construction tools are needed, and the construction process is simple.

■ Disadvantages:

Large-scale field level is required, which has a large impact on the environment, a large demand for concrete, a long maintenance period, and a large amount of labor. Foundation burial depth is not enough to resist flooding.

03. Spiral steel pile foundation:

■ Definition

Hot-dip galvanized steel pipe piles with spiral blades are used under the front and rear columns of the photovoltaic bracket. The rotating blades can be large, small, continuous and intermittent, and continuous welding between the rotating blades and the steel tube. During the construction process, professional machinery is used to screw it into the soil.  

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The upper part of the spiral pile foundation is exposed to the ground, and the upper part of the spiral pile is connected by a screw. Through the side friction resistance between the pile side of the steel pipe pile and the soil, especially the biting force between the rotating blade and the soil body to resist the pull-up force and bear the vertical load, the pile-soil interaction between the pile body, the spiral blade and the soil body is used. Acts against horizontal loads.

■ Advantages:

Fast construction speed, no leveling of the site, no earthwork excavation, maximum protection of the vegetation in the site, and easy restoration of the site to the original appearance, convenient adjustment of the upper support, height of the support can be adjusted with the terrain. The impact on the environment is small, the labor required is small, and the spiral pile can be reused.  

■ Disadvantages:

The construction cost is relatively high, and special construction machinery is needed. The most important thing is that the horizontal bearing capacity of the foundation is closely related to the compactness of the soil layer. The spiral pile foundation requires a certain compactness of the soil layer, especially the shallow soil layer close to the ground. It can be too loose; the corrosion resistance of the spiral pile foundation is poor. Although thick hot-dip galvanizing can be used, it is difficult to adapt to the strong corrosive environment.

04. Reinforced concrete pile foundation:

Cast-in-situ reinforced concrete pile  

■ Definition

A round field-filled short pile with a diameter of about 300mm is used as the foundation for the rooting of the support. The length of the pile into the soil is about 2m and the ground is 300-500mm. The length of the pile into the soil can be determined according to the mechanical properties of the soil layer. The rear pillars are connected. This foundation construction process is simple and fast. Now a hole is formed in the soil layer, then steel bars are inserted, and then concrete can be poured into the hole.  

■ Advantages:

Save material, low cost and fast construction speed.  

■ Disadvantages:

The soil layer has higher requirements. It is suitable for silty soil with a certain density or plastic and hard plastic silty clay. It is not suitable for loose sandy soil layers. Loose sandy soil layers are liable to cause collapse. Cobblestones or crushed stones with hard soil may have problems of not forming holes easily.

Precast reinforced concrete piles:

■ Definition

Precast reinforced concrete piles are prestressed concrete pipe piles with a diameter of about 300mm or precast reinforced concrete square piles with a section size of about 200 * 200mm. The precast reinforced concrete piles are driven into the soil, and steel plates or bolts are reserved at the top to connect with the front and rear columns of the upper bracket. The force principle is the same as that of cast-in-situ reinforced concrete piles, and the cost is slightly higher than that of cast-in-situ reinforced concrete piles.

■ Advantages:

Construction is simpler and faster.

■ Disadvantages:

The cost is relatively high.

Source: Optoelectronics

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