Compression-expansion type wedge-shaped inn anchor head

The invention provides a compression-expansion type wedge-shaped inner anchor head, which comprises an inner anchor head, an arc-shaped inner anchor head protective sealing device and an anchor cablesteel strand fixing device. The inner anchor head is wedge-shaped and its arbitrary cross-section is rectangular. The anchor cable steel strand penetrates the wedge-shaped inner anchor head, and the end of the anchor cable steel strand is locked by the anchor cable fixing device. After the locking, the outer cover of the anchor cable steel strand is provided with an arc-shaped inner anchor head protective sealing device. A steel strand of that anchor cable passes through the wedge-shaped inner anchor head body, after being embedded in the rock as a whole, the tensile force on the steel strandof the anchor cable acts on the body of the wedge-shaped inner anchor head, converted by the wedge-shaped internal anchor head into different directions of swelling force, reacting on surrounding rockmasses, The stress state o