公开(公告)号：US10767480B2

公开(公告)日：2020-09-08

申请号：US15751808

申请日：2017-06-07

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Nong Zhang ,  Peng Ma ,  Changliang Han ,  Zhengzheng Xie

IPC: E21D21/00 ,  E21D20/00 ,  E02D5/74 ,  E21D20/02

Abstract: Provided is a mounting method for an extensible reaming self-anchoring anchor rod, which is especially applicable to roadway construction in coal mines. A big helical structure is arranged on two rod sections of a sectional type anchor rod, a simple drill bit drills and reams a bore and cuts the coal mass in one operation, the outer diameter of the simple drill bit is smaller than the outer diameter of the big helical rod body, and the big helical structure accomplishes secondary reaming, self-drilling and self-anchoring in the drilling process; the big helical structure inhibits propagation and development of sheet cracks of the coal wall in the radial direction, and is embedded in the coal mass through a self-stabilization process of the rock mass.