Hollow bar anchor can carry out drilling, grouting and anchoring integrally and will well improve surrounding rocks in various types of slope treatments so as to gain expected support results and solve hole forming difficulty problems in anchoring.

With increasing traffic, energy and other infrastructure constructions, anchoring technology has developed rapidly, which can give full play rock self-stability in tunnels, basements and slope. It shows broad prospects with the use level of hollow bar anchor. 

Given all that, the grouting parameters of hollow anchor bar are as follows:

⑴ Hollow anchor bar system

Grouting material: cement slurry

Water cement ratio: 0.4 ~ 0.5

Grouting pressure: 0.2 ~ 0.5Mpa

⑵ Expansion hollow anchor bar system

Grouting material: grout

Water cement ratio: 0.4 ~ 0.5

Grouting pressure: 0.35 ~ 0.45Mpa

The amount of 4.0m hollow anchor bar used crack repair is 240 and 10.0m expansion hollow anchor bar is 160. From the actually monitoring data, we can find hollow anchor bar has a obvious grouting reinforcement and achieves the desired effect. 

Hollow anchor bar which compared to previous anchor construction,improve the bolt grouting construction technology, effectively solved the problem which the anchor grouting is not full,after years of use, and it has been widely used in tunnel construction.

Here introduce the working principle of hollow anchor bar:

Mortar through a small section of the hollow anchor bar body from the connection on the set of pulp slurry mouth, bolt used in arch department, mortar filling anchor hole from bottom to top, anchor hole air vent, from the depth of the anchor hole at the top of the exhaust pipe and mortar grouting process, the inherent nature of air, to ensure the mortar and close-grained.

With our long history of manufacturing and constantly challenging ourselves to improve,Sinorock have become the one of professional hollow anchor bolt manufacturers in China. We are proudly manufacture using domestic steel and support other manufacturers when ever possible.