Combined net rack

The utility model relates to the field of the building structure; the technical problem to be solved is to overcome the defects in the prior art and to design a novel combined net rack so as to fulfill the aim of achieving simple design and calculation, convenient construction and good waterproofing property and bearing heavy load, etc. The structure of the combined net rack comprises an upper chord, a lower chord and a web member of the net rack; the upper end of the web member is connected with the lower part of the upper chord; the lower end is connected with the lower chord; the improvement is that: the upper chord comprises an integral concrete board and a steel structural beam; the steel structural beam is positioned inside the integral concrete board and is at least partially arranged on outer side of the lower surface of the integral concrete board; the lower chord and the web member are steel structures and connected with the lower side of the integral concrete board by a hollow segment.