Self-drilling hollow grouting anchor, hollow anchor bolt grouting 
 The product by the body of the hollow bolt, anchor head, only the pulp plug, plate and nut. 
 1 hollow bolt 
 The bolt body to the hollow design, the rod hole drilling high pressure feng shui channel and grouting channel, compared with the solid rod, hollow rod design can be better rigidity and shear strength. Anchor the outer surface of the thread structure of the full-length standard pitch, the thread structure to facilitate the cutting of the bolt and take a long rod with a smooth increase of bonding area of ??the bolt body and grouting materials, thereby enhancing the anchoring force. 
 (2) anchor head 
 Anchor head with a steel anchor head, not only can be fixed and the center bolt body parts and anchoring force in the rock anchor hole. 
 3 grouting plug 
 Grouting plug is made from rubber materials consider the grouting exhaust seal is easy to realize there is pressure grouting, grouting material fullness and density increase. Grouting plug on the role of the stent. 
 4. Plate 
 Rolled molding plate, with some degree of flexibility, ease of stress transfer. The pad provides adjustable angle of 7 degrees, to facilitate the tight rock surface. 
 5 nut 
 With hemispherical or hexagonal nut, the nut on the rod to exert active stresses. 
 Applications: 
 Applicable to medium geological conditions, the surrounding rock permanent support, advanced support, slope support, excavation support projects through the hollow bolt, pressure grouting, can achieve the consolidation of broken rock, improved rock body, so as to achieve the purpose of supporting. 
 Product Model nominal outside diameter / wall thickness (mm) ultimate tensile strength (KN) elongation (%) threaded rod to pitch (mm) bolt hole diameter (mm) standard length (m) 
 BQD25 25/3 ≥ 150> 6 left / right-handed 10 / / 12.7 Φ40-Φ42 2/2.5/3/3.5/4/4.5 / 
 5/5.5/6/6.5/7/7.5/8 
 BQD25 25/5 ≥ 200> 6 left / right-handed 10 / / 12.7 Φ40-Φ42 
 BQD28 28 / ≥ 280 5> 6 Left / right-handed 10 / / 12.7 Φ48 
 BQD32 32/6 ≥ 280> 6 left / right / / 12.7 10 Φ50 
 BQD38 38/7 ≥ 350> 6 left / right-handed 10 / / 12.7 Φ75 
 BQD51 51/8 ≥ 500> 6 left / right 10 / / 12.7 Φ80 
 Note 1. Hollow bolt mechanical properties according to user request. 2 plate, nuts, grouting plug, anchor head can be more user requests.