A reasonable form of photovoltaic bracket can improve the system's ability to resist wind and snow load, and reasonably use the characteristics of the photovoltaic support system in terms of bearing capacity. It can further optimize its size parameters, save materials, and contribute to the further reduction of the cost of the photovoltaic system.
The loads acting on the basis of the PV module bracket mainly include: the weight of the bracket and the photovoltaic module (constant load), wind load, snow load, temperature load and seismic load. Among them, the wind load is the main control function. Therefore, the basic design should ensure the stability of the foundation under the action of wind load. Under the action of wind load, the foundation may have the phenomenon of pull-up, fracture, etc. The basic design should be able to guarantee the force No damage occurs.
Below we have to understand what are the basic types of ground-based photovoltaic stents and planar roof photovoltaic stents and what are their characteristics.
Ground PV Bracket Foundation
NO.1 bored pile foundation:
Hole formation is more convenient. The top surface elevation can be adjusted according to the topography, the top elevation can be easily controlled, 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 concrete holes and pouring at the site, which are suitable for general filling, cohesive soil, silt, and sand.
NO.2 steel spiral foundation:
Hole formation is convenient, and the elevation of the top surface can be adjusted according to the terrain without being influenced by groundwater. The construction is performed as usual in winter weather conditions, the construction is quick, the elevation adjustment is flexible, and the damage to the natural environment is very small, there is no fill and excavation work, and the original vegetation is destroyed. Small, no field level. Applicable to deserts, grasslands, beaches, next door, frozen soil. However, the use of steel is large and it is not suitable for strong corrosive foundations and rock foundations.
NO.3 independent basis:
Strongest resistance to water loads, flood resistance and wind resistance. The largest amount of reinforced concrete is required, many are artificial, the excavation and backfilling of earthwork is large, the construction period is long, and the environmental destruction is great. Photovoltaic projects have rarely been used.
NO.4 reinforced concrete strip foundation:
This type of basic form is mostly used in poor foundation bearing capacity and is suitable for flat single-axis tracking photovoltaic supports with relatively flat sites, low groundwater levels, and high requirements for uneven settlement.
NO.5 Precast pile foundation:
Pre-stressed concrete pipe piles with a diameter of about 300 mm or square piles with a section size of approximately 200*200 are driven into the soil. The top reserved steel plate or bolts are connected with the front and rear columns of the upper support. The depth is generally less than 3 meters. The construction is simple and fast. .
NO.6 bored pile foundation:
The construction cost is lower, but the requirements for the soil layer are higher. It is applicable to silty soils with a certain degree of compaction or plastic clays and hard plastic silty clays. It is not suitable for loose sandy soil layers, and the pebbles or crushed stones are harder. Stones may have problems with not forming holes.
NO.7 steel spiral pile foundation:
It is screwed into the soil with special machinery. The construction speed is quick, there is no need for site formation, no concrete for the earth, and maximum protection of vegetation in the field. The height of the support can be adjusted with the terrain, and the spiral pile can be used twice.
NO.8 Planar Roof PV Bracket Foundation:
Cement counterweight method: Cement concrete piers are poured on the cement roof. This is a common installation method. The advantages are firm and do not damage the roof waterproof.
Prefabricated cement counterweight: It is more time-saving to make cement piers and save cement embedded parts.
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