A metal anchor rod with pressure-yielding function and its application method

Abstract

The invention discloses a metal anchor rod with pressure-yielding function. On the basis of the prior art, a pressure-yielding base is added. The left base of the pressure-yielding base is an integral structure, including a bottom plate and a lower cylinder. The inner diameter of the lower cylinder is d1, the inner diameter of the upper cylinder is d2, the length of the upper cylinder is 20-25mm, and the length of the lower cylinder is 25-30mm; the cylinder of the right base A certain number of through notches are evenly opened on the wall of the cylinder along the axial direction, and a certain number of ribs are formed on the cylinder wall so that it has the ability to produce large elastic deformation after being compressed; the length of the cylinder is 45 ~50mm, the wall thickness is 5~8mm, and the outer diameter is d3; the above d1≥d3, d3=d2+1mm. The use method of the present invention is basically the same as that of the common bolt in the prior art, and has the advantages of simple structure, convenient use, low manufacturing cost, safe support, and labor-saving and other beneficial effects.

Description

technical field [0001] The invention relates to a metal anchor rod and its use method, in particular to a metal anchor rod with pressure-relieving function and its use method. Background technique [0002] As we all know, the tensile strength and elongation at break of materials are a pair of contradictory unity. Although the anchor rod made of rigid material has high anchoring strength, the deformation can increase rapidly during the support process of the large deformation roadway, especially in the early stage of deformation of the surrounding rock, which will lead to the axial deformation of the metal anchor rod. The force rapidly increases. It is not difficult to imagine that due to the extremely small elongation at break, metal anchors are often broken instantly, resulting in the failure of the anchor support and may lead to roof fall accidents. [0003] Based on this, the pressure anchor came into being. However, the various yield anchors in the prior art generally...

AI Technical Summary

Problems solved by technology

In actual use, due to the rapid destruction of the pressure pipe (instantaneous disappearance), it is difficult to avoid some sand, gravel or loose stones during the "rapid" deformation or sinking of the roof slipping phenomenon

That is to say, due to the congenital deficiency of its structural form, this kind of yielding anchor still has many deficiencies in its actual yielding effect and safety performance, which need to be improved and improved.

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