Patent ID: 8186120

Claim:
A base frame for a parking lot roof equipped with photovoltaic modules, comprising: two mirror-symmetrically constructed halves, with each half comprising an inner arc constructed of three inner struts, an outer arc constructed of three outer struts and first, second and third cross struts, wherein in each half a first inner strut and a first outer strut are secured to a ground at an anchor location, from where the first inner strut and the first outer strut extend by enclosing an acute angle with each other; each of a second inner strut connected to the first inner strut and a second outer strut connected to the first outer strut extend at a shallower angle with respect to a horizontal than the first inner strut and the first outer strut; each of a third inner strut connected to the second inner strut and a third outer strut connected to the second outer strut extend at a shallower angle with respect to the horizontal than the second inner strut and the second outer strut; the first cross strut connecting upper ends of the first inner strut and the first outer strut with each other, the third cross strut connecting upper ends of the second inner strut and the second outer strut with each other, and the second cross strut connecting an upper end of the second inner strut with a lower end of the second outer strut, with an end of the third outer strut protruding a distance from an end of the third inner strut, wherein an end of each half is connected with an end of the other half to form a center of the parking lot roof.