Application of Hollow Anchor Bar in Crack Repair

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 anchor bar.
Qingdao subway project (Line 3) Wannianquan Station, the underground section of the surrounding rock is poor with many parietal callus, plentiful underground water. And due to the construction blasting vibration, the main construction of the tunnel has a longitudinal and horizontal cracks. 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.

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