Soft rock roadway anchored steel pipe concrete anti-floor heave device

The utility model discloses a soft rock roadway anchored steel pipe concrete anti-floor heave device mainly comprising a steel pipe pile, a mine or grouted bolt or anchor cable, a cushion block and a nut, wherein the steel pipe pile comprises a steel pipe body and inner cast-in-place concrete; a through hole is arranged at the position of the steel pipe pile 100-200mm away from the upper end toward the oblique bottom, and the included angle of the axis of the through hole and the axis of the steel pipe pile is in the range of 10-15 degrees; the cushion block is a cylinder provided with a through hole at the middle, the front end section of the cylinder is a curved surface inosculated with the steel pipe pile, and the rear end section is an inclined plane vertical to the axial direction of the bolt or anchor cable; and the bolt or anchor cable penetrates out of the through hole of the steel pipe pile and then is sheathed with the cushion block and fixed using the nut to form an anchor-drawing structure. The soft rock roadway anchored steel pipe concrete anti-floor heave device can effectively control the bottom heave of a roadway and improve the stress distribution, has the advantages of simple and convenient construction process, low cost, short construction period, high cost performance ratio and stable physical mechanical property.