How are distributed PVs installed for different roof types?
According to the type of roof, each building is mainly divided into concrete roof, color steel tile roof and tile roof. The installation of distributed photovoltaic power plants mainly uses the weighting method and the fixture method according to these three different types.
First, the concrete roof
(1) Solar panel mounting tructure form
Concrete roofs suitable for the construction of rooftop distributed photovoltaic power plants are generally in the form of flat roofs.
(2) Installation method
Concrete roofs are generally based on concrete weights. They do not damage the original structure of the roof. In the actual design and installation process, the foundation will have various forms, such as strip foundation, square foundation, reinforced concrete weight. Block + special engineering plastic brackets and other programs, but the basic principles are the same.
Due to the use of a tiled roof, the tilt angle of the module is generally 5° or 10°, the wind load is small, and the steel bracket is not used. Therefore, the photovoltaic system has a small gravity load per unit area, which can meet the concrete roof of the people. Bearer requirements.
(3) Load requirements
Because the concrete roof is based on the weight of the weight, and the weight is generally about 80-100kg, the installation method of the roof distributed photovoltaic has higher requirements on the roof. The concrete roof has the upper roof and the upper roof. According to the Code for Loads of Buildings (GB50009-2012), the design standard of the live load of the roof is 2.0KN/m2 (200kg/m2). The design value of the live load on the roof of the upper man is 0.5KN/m2 (50kg/m2). Therefore, for the roof of the upper man, the roof with a load of not less than 2.0 KN/m2 can basically be judged as suitable for the construction of this type of roof distributed photovoltaic power station, and for the roof without roofing, a special design scheme is needed, as shown in the above figure. Reinforced concrete counterweight + special engineering plastic bracket scheme.
Second, color steel tile roof
(1) Structure form
Color steel tile roof is generally the roof of the factory. According to the specifications of color steel tile, it is generally divided into angle-type color steel tile, vertical seam-type color steel tile and trapezoidal color steel tile.
2) Installation method
According to different color steel tile forms, you can choose the corresponding fixture or support base.
Due to the angular and vertical seam-type color steel tile, the installation method can directly use the fixture as the basis of the roof distributed photovoltaic module without destroying the integrity of the color steel tile. Therefore, the two types of factory roofs are suitable for the roof. Distributed photovoltaic power plants, while trapezoidal color steel tile roofs have damaged the integrity of color steel tile due to the installation method of photovoltaic module bearings, so there is a hidden danger of water leakage. This type of installation method should be waterproof.
(3) Load requirements
Color steel tile roof construction photovoltaic power station, because the installation foundation is mainly the fixture, the weight is not too large, so the bearing capacity of the roof is not very high. The roof of the color steel tile is generally not covered by people. According to the Code for Loads of Building Structures (GB50009-2012), the design standard value of the live load of the roof is 0.5KN/m2 (50kg/m2). Generally meet the construction requirements.
Third, tile roof
Tile roofs are generally residential building roofs, and the solar mounting structure of the tiles is varied, but the basic installation process is the same.
The installation process of the tile roof photovoltaic power station is as follows:
(1) Select the corresponding hook according to the type of the tile, and fix the solar tile hook on the roof wooden beam with bolts;
(2) Select the appropriate guide rail according to the roof load requirements, and fix the guide solar rail to the solar tile hook with bolts;
(3) Slide the installed clamp into the guide rail. After placing the components, tighten the bolts to fix the components.