Self-drilling pore-forming expanded-head anchor rod

The anchor rod sequentially comprises an expanded head section, an anchoring section, a free section and an anchor sealing built-in section from the head end to the tail end, and the anchor sealing built-in section comprises a beam arranged on a pile foundation, a base plate fixed to the outer side of the beam and an anchor head; the diameter of the expanded head section is 2-3 times that of the anchoring section, and the anchor rod completes hole forming and pouring in rock soil through an anchor rod hole forming device. The self-drilling hole-forming expanded-head anchor rod is not limited by working places and not influenced by the construction sequence of traditional anchor rods and pile foundations, and is high in strength and good in tensile property. 本发明公开了一种自钻成孔扩大头锚杆，所述锚杆由首端至尾端依次包括：扩大头段、锚固段、自由段和封锚嵌固段，所述封锚嵌固段包括设置于桩基上的梁以及固定于梁外侧垫板和锚头；扩大头段的直径为锚固段直径的2至3倍，所述锚杆采用锚杆成孔装置于岩土内完成成孔及浇筑。本发明自钻成孔扩大头锚杆，不受工作场所限制，不受传统锚杆和桩基施工顺序的影响，强度高、抗拉伸性能好。