U-shape hollow section bar

The utility model relates to a U-shaped hollow section bar. The cross section of the section bar forms a hollow U shape. The section bar is formed by the connection integration which is composed of a flat plane 10, two inverted U-shaped plates 20, 40 and a connecting plate 30 which is used for connecting the U-shaped plates 20, 40, wherein the flat plane 10 is folded and combined with the connecting plate 30 together, and the two inverted U-shaped plates 20, 40 are plumbed to the flat plane 10, wherein a U-shaped mouth end of one U-shaped plate 20 is provided with an epitaxial plate 21 which is folded and combined with the flat plane 10 together, and a U-shaped mouth end of the other U-shaped plate 40 is connected with the flat plane 10 to form integration; two cavities 50 are arranged between the two inverted U-shaped plates 20, 40 and the flat plane 10. The utility model has the advantages of scientific structure, high strength, light weight, tight assembly and fit with mould plates, good flexural performance, convenient use, long service life, material saving and low cost, and can be widely used for structural section bars, particularly manufacture of mould plates for construction of industries and civil architectures.