Solid Support System Construction Technology of U-type Concrete Filled Steel Tube Arch of Soft Rock Roadway in Kilometer Deep Mine

U-type concrete filled steel tube arch which has high bearing capacity and good stability is a new kind of tunnel supporting form. Based on the construction process character of U-type concrete filled steel tube, the design content, construction technology principle and construction process of U-type concrete filled steel tube arch solid support system were described in detail, and key construction process and operation points were studied. Support system and construction process were successfully applied in Zhaolou Mine and supporting effect was good.