Hollow grouting anchor itself doubles  λas a drill pipe and groutσ<ing tube for blowing dust before grou§σ×ting tube, both rule out©αφ₩ the the drilling formation¥≥ of dust, grouting slurry₩φ¥™ ejected from the dri↓εll bit through the hollow boltσ<Ω₹, fill in the blank an<>chor around the drillholes and strati∑£Ω$graphic fissures, the anchor and the £♦∏surrounding soil solidified into≠♥& one to form the steel pipe concrete ÷✘pillars, played the role of reinfor≠>cement.
Bolt axial force, the stress'φ÷  state of the rock mass‌↔ surrounding rock in a cer>♦tain range into a thα♥ree-way one-way (or two-way) comp♠ ression pressure, thereby Ω≤increasing its ring to the compressiv™​δ≠e strength, compression with e±₽λither under its own weight, buγ₩∞​t also to withstand the external loaπσ​±d, making it effective control o§σf the surrounding rock deformation.