Self drilling mining anchor – rock bolt is one of the important support part in coal mines. Its existence solves many problems in construction and can ensure grouting effect under the chaotic geological conditions.
Mine anchor – rock bolt is used as a tensile member deep into the stratum. One end is connected to engineering structure and other end is deep into stratum. The entire anchor section is divided into a free segment and an anchor segment. In free segment, tensile force at anchor head is transmitted, The anchor function area is to apply prestress to anchor rod; anchoring section refers to area where cement slurry binds prestressed tendons to soil layer. Its function is to increase conflict effect between anchor and soil layer. The anchoring effect is added to transmit tensile force of free section to the soil of deep depth.
Advantages of self drilling mining anchors:
- Self-contained drill bit, which can be used for self-drilling mining anchors, which have both the functions of drill rod and anchor rod. The process of inserting anchor rod into drill rod is cancelled, which can prevent rework due to hole collapse
- Mining bolt body can be extended, with a variety of specifications, easy to use.
- Compared with solid rod with the same cross-sectional area, hollow rod has greater resistance, bending resistance and surface adhesion.
- Mining anchor is hollow, and can be grouted to ground through mining anchor. General mining anchors are solid steel bars, while self drilling mining anchors are hollow steel pipes. (Mine anchors are grouting pipes. Mortar enters from the end of the mine anchor, passes through the hollow web and hollow drill, and is used from mine. The front end of anchor rod overflows, and grout comes back to the end, which can ensure filling of mine anchor to turn around open ground and consolidate rock mass, fully ensuring grouting and anchoring quality. The stopper plug can ensure dense grouting and can reach a pressure of 1.5 ~ 2.0MPa.)
- Mining anchor is equipped with arched backing plates and nuts, which can apply prestress to the ground.
- It can be drilled by ordinary drilling machinery, such as hand-held wind drill.
