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The classification of flexible photovoltaic brackets

Flexible photovoltaic brackets are a type of large-span photovoltaic module support structure with tension-based design, where the components are supported by cables and fixed at both ends. Compared to rigid fixed brackets, flexible support structures are characterized by "large span, high clearance, and long row spacing."

Flexible brackets are divided into the following types: single-layer cable structure, double-layer cable truss structure, fish-belly cable truss structure, and string structure.

1. Single-Layer Cable Structure
   A single-layer cable structure typically consists of the main steel frame made up of beams and columns, tensioned cables, and other primary components. The cable system includes two cables parallel to the module plane, replacing the conventional tensile components. Once the supporting cables are tensioned, they are anchored at the ends through anchoring devices at the steel beam's end. The tensioning equipment provides the necessary stiffness for the supporting cables, which are used to support the modules and form a self-balancing system via the tensioned cables at the end.

2. Double-Layer Cable Truss Structure
   The double-layer cable truss structure is composed of a main steel frame made up of beams and columns, tensioned cables, and rigid struts between the cables. The cable system consists of two parallel upper-chord cables and one lower-chord cable that curves upwards. Compared to the single-layer cable structure, this system includes load-bearing cables and rigid struts, which, when tensioned, provide the necessary stiffness for a self-balancing system.

3. Fish-Belly Cable Truss Structure
   The fish-belly cable truss system consists of diagonal bracing, columns, horizontal beams, struts, module-supporting steel cables, and cross-fixed steel cables. This structure is simple, aesthetically pleasing, and uses fewer support points. It minimizes ground space occupation, reduces earthworks, and lowers construction costs by fixing only a limited number of points between the columns and diagonal supports.

4. String Structure
   The string structure is composed of a main steel frame made of beams and columns, tensioned cables, rigid upper chords, cable components, and rigid struts. The load-bearing cables replace the tension cables in a three-layer cable truss. The upper chord uses a rigid structure, while the lower chord employs flexible cables. Under pre-stress, the struts provide elastic support to the upper chord, improving the force distribution of the upper structure, thus forming a self-balancing system.

This concludes the classification of flexible photovoltaic brackets as introduced by Hengyuan Tai.