Steel box component and steel box-concrete combined U-shaped beam consisting of same

The utility model discloses a steel box component, which mainly comprises a U-shaped steel part, n-shaped steel parts and a steel tube arranged at the midspan position of the U-shaped steel part, wherein the n-shaped steel parts are arranged in U-shaped spaces at the two ends of the U-shaped steel part; the length directions of the n-shaped steel parts are consistent with the longitudinal direction of the U-shaped steel part; the lower ends of inner side plates of the n-shaped steel parts are fixedly arranged on a bottom plate of the U-shaped steel part, and the inner side plates of the n-shaped steel parts and the bottom plate of the U-shaped steel part enclose hollow pouring chambers with inner and outer ports; pouring holes are reserved in top plates of the n-shaped steel parts; the inner ports of the pouring chambers are provided with vertical sealing plates; the steel tube is suspended, and orifices in the two ends of the steel tube are connected to the sealing plates respectively, and are sealed by the sealing plates; and gaps are formed between the U-shaped steel part and the steel tube and between the n-shaped steel parts and the steel tube. The utility model also discloses a steel box-concrete combined U-shaped beam consisting of the steel box component. According to the steel box component and the steel box-concrete combined U-shaped beam consisting of the same, the construction cost is saved, a construction period is shortened, the bearing capacity is improved, the resistance to bending at a beam support is improved, a reinforcement arrangement area at the support is reduced, and the dead weight at the support is reduced by about 25 percent.