The solar photovoltaic bracket is a special bracket designed for placing, installing and fixing solar panels in a solar photovoltaic power generation system. As an important part of a photovoltaic power station, solar photovoltaic support carries the main body of the photovoltaic power station. Choosing the right photovoltaic bracket can not only ensure the safe operation of photovoltaic modules, reduce the damage rate, but also reduce the engineering cost and reduce the maintenance costs in the later stage.
First, the classification of solar photovoltaic brackets
The materials used in solar photovoltaic brackets are different, mainly aluminum alloy, stainless steel and non-metal. Among them, the use of non-metals is less. The classification of solar photovoltaic brackets is shown below:
1. Fixed photovoltaic bracket
A fixed photovoltaic bracket refers to a bracket system that maintains the same orientation and angle after installation. The fixed installation method directly places the solar photovoltaic module toward a low latitude area (at a certain angle with the ground), and forms a solar photovoltaic array in a series and parallel manner, thereby achieving the purpose of solar photovoltaic power generation. There are many kinds of fixing methods. For example, the ground fixing method includes the pile foundation method (direct embedding method), concrete block counterweight method, pre-buried method, ground anchor method, etc. The roof fixing method has different schemes depending on the roofing materials...
For example the ground bracket fixing method, the glazed tile roof, the main support member machine component fixing pressure block, the color steel tile roof bracket fixing method
2.Tracking photovoltaic bracket
When the sun's rays are perpendicular to the battery panel, solar energy receives the largest amount of solar energy and the highest power generation. But the earth is revolving and rotating all the time, so the angle of the sun's rays changes all the time. Therefore, the tracking system is aimed at the sun as much as possible, so that the solar rays receive more solar rays per unit area of the battery panel, thereby increasing the power generation. At present, tracking systems include two types of single-cycle tracking systems and dual-axis tracking systems. Single-axis tracking systems are divided into horizontal single-axis tracking systems and oblique single-axis tracking systems.
Horizontal single-axis tracking, oblique single-axis tracking, dual-axis tracking bracket
Second, the installation of the solar photovoltaic bracket
The installation of the bracket should be carried out according to the design drawings. The positioning and wire drawing of the color steel roof is mainly the positioning of the fixtures, and then the installation of the guide rails. Pay attention to the spacing of the fixtures, the distance between the same-row component guides and the adjacent two-row component guides. The installation of the guide rail should be installed in the middle section, two end sections, and the rail connecting parts in order. After the installation of the guide rail, check the levelness of each guide rail, and the bending degree of each span of the guide rail should not be greater than 1mm.
After the installation of a set of brackets is completed, the exact position of the brackets is checked. Pay attention to the spacing between the front and rear rows, and the distance from the wall in the design. Protective measures should be taken during lifting and handling to avoid personal injury and damage to the original building. In addition, do not fasten the bolts in place at one time when installing the pillars, beams and guide rails of the bracket. The brackets are all straightened and the bolts are all tightened. The following describes several common methods of installing distributed photovoltaic brackets:
Cement weight method
Pouring cement pier on a cement roof is the most common installation method.
2. Installation of two-component tendons in special power stations
One. In terms of material strength
The bracket is generally made of Q235B steel and aluminum alloy extruded profiles 6063 T6.
In terms of strength, 6063 T6 aluminum alloy is about 68% -69% of Q235 B steel, so steel is generally better than aluminum alloy profiles in strong wind areas and large spans.
two. Deflection
The deflection of the structure is related to the shape and size of the profile and the elastic modulus (a parameter inherent to the material) and is not directly related to the strength of the material.
Under the same conditions, the deformation of aluminum alloy profiles is 2.9 times that of steel, and the weight is 35% of steel. In terms of cost, aluminum materials are 3 times that of steel. Therefore, generally in the strong wind area, the span is relatively large, the cost and other conditions of steel are better than aluminum alloy profiles.
three. Anti-corrosion
At present, the main anti-corrosion methods of the steel are 55-80μm galvanized steel and 5-10μm anodized aluminum alloy.
The aluminum alloy is in the passivation area under the atmospheric environment, and a dense oxide film is formed on the surface, which prevents the surface of the active aluminum substrate from contacting the surrounding atmosphere, so it has very good corrosion resistance, and the corrosion rate increases with time. While decreasing.
Under normal conditions (C1-C4 environment), the thickness of 80μm galvanized steel can be guaranteed for more than 20 years, but the corrosion rate is accelerated in high-humidity industrial areas or high-salinity seashores and even temperate seawater. Above and require regular maintenance every year. Aluminum is far superior to steel in terms of corrosion protection.
Comparison in other aspects
(1) Appearance: There are many surface treatment methods for aluminum alloy profiles, such as anodizing, chemical polishing, fluorocarbon spraying, and electrophoretic painting. Beautiful appearance and can adapt to the various strong corrosive environments.
Steel is generally hot-dip galvanized, surface sprayed, and painted. The appearance is worse than aluminum alloy profiles. It is also inferior to aluminum profiles in terms of corrosion prevention.
(2) Diversity of sections: The general processing methods of aluminum alloy profiles include extrusion, casting, bending, stamping and other methods. Extrusion production is currently the mainstream production method. By opening the extrusion die, it can achieve the production of any arbitrary cross-section profile, and the production speed is relatively fast.
Steel is generally rolled, cast, bent, stamped, etc. Rolling is currently the mainstream method of producing cold-formed steel. The cross-section needs to be adjusted by the roller wheelset, but after the machine is shaped, it can only produce similar products, and the size can be adjusted, and the cross-sectional shape cannot be changed, such as C-shaped steel, Z-shaped steel, and other sections. The rolling production method is relatively fixed and the production speed is relatively fast.
Five, comprehensive performance comparison
(1) Aluminum alloy profiles are light in weight, beautiful in appearance, and excellent in anti-corrosion performance. They are generally used in roof power stations that require load-bearing and strong corrosion environments. Will have better results.
(2) The steel is high in strength and small in deflection when subjected to load. It is generally used in power stations under ordinary conditions or for components subject to large forces.
(3) Cost: Generally, the basic wind pressure is 0.6kN / m2 and the span is less than 2m. The cost of aluminum alloy bracket is 1.3-1.5 times that of the steel structure bracket. In a small-span system, (such as a color steel roof), the cost difference between the aluminum alloy bracket and the steel structure bracket is relatively small, and the aluminum alloy is much lighter than the steel bracket in terms of weight, so it is very suitable for roof power stations, especially with limited load-bearing and Photovoltaic roof tiles without dip.
In windy areas, the use of steel supports has a significant economic benefit when the span is relatively large.
Send feedback
History