Self dri1ling hollow rockbolt
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Self dri1ling hollow rockbolt
Self dri1ling hollow rockbolt
The anchor rod is composed of a solid rod body at the front end and a hollow rod body at the rear end. The hollow rod body and the solid rod body are combined through a connecting sleeve, and the connecting sleeve is provided with a slurry arrester; the inner hole of the connecting sleeve is connected with the hollow rod body cavity with a lateral hole channel; the supporting plate, nut and washer are matched with the rear end of the hollow rod body; the supporting plate is provided with a hole channel, and a pipe through the supporting plate.
The solid bolt body at the front end of the bolt has good strength and low cost. The hollow bolt body in the back part has the function of feeding slurry or exhausting air, which can be adapted to temporary or permanent support projects of various rock formations. The bolt is prestressed after installation and belongs to active support type bolt.
| Model | RDH25/18 | RDH25/20 | RDH25/22 | RDH27/25 | RDH32/28 |
| Nominal diameter of hollow anchor bolt (mm) | 25 | 25/4 | 25/5 | 27/6 | 32/6 |
| Hollow anchor body model | R25/5-B | R25/4-A | R25/5-A | R27/6-A | 32/6-A |
| Nominal diameter of threaded reinforcement (mm) | 18 | 20 | 22 | 25 | 28 |
| Type of threaded reinforcement | HRB355(GB/T1499) | ||||
| ultimate tensile strength of anchor bolt | 120KN | 150KN | 180KN | 230KN | 290KN |
| Drill hole diameter | 42-46 | 42-46 | 42-46 | 42-46 | 50-60 |
| Length of anchor rod (m) | 6m (length of reinforcement section 1/1.5/2/2.5/3m) | ||||
| Remarks | 1. The mechanical index of hollow anchor rod body is the same as that of RD type hollow grouting anchor rod. 2. The prestress value of anchor rod can refer to the prestress value of EX type shell (prestress) anchor rod system. The prestress value is determined according to the design requirements. | ||||
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