The role of hollow grouting anchor rod in tunnel construction

　　1 Construction preparation

　　① Check the feng shui, electricity and equipment pipes and test them to ensure that they are in a safe state. ②The on-site anchor rod meets the requirements. ③Operators wear personal protective equipment. ④ Please check the surrounding rock on site before construction to ensure safety.

　　2 measurement positioning

　　Determine the position of the hollow grouting anchor hole according to the design requirements and mark it. The allowable deviation of the hole position is ±100mm.

　　3 drilling installation

　　① Check whether the water hole of the anchor drill bit is unblocked, if it is blocked, please clean it in time. ② Align the anchor rod with the hole position and slowly drill to the design depth. The exposed length of the hollow grouting bolt is maintained at 10-15 cm.

　　4 clean up inspection

　　① The bolt grouting hollow drill into the design depth, water and high pressure air flushing holes.

　　②Check whether the bolt spacing, length and angle meet the requirements, if not, discard the re-drilling.

　　5 bolt grouting

　　① When preparing the mud, the operator should wear rubber gloves, goggles and long rubber shoes. ②Pour the grouting into the middle hole of the rod. The upper and lower holes should be equipped with stop plugs and exhaust holes as required, and the grouting pressure should be controlled according to the technical requirements. ③Grouting should be done at intervals and intervals. After the grouting is finished, check the effect and fill the unqualified grouting. ④When grouting, workers are not allowed to stand near the grouting port.

　　6 acceptance

　　①The installation quantity meets the requirements, and the penetration length of the anchor rod is not less than 95% of the design. ②After the cement slurry strength reaches 10.0MPa, the back plate nut can be tightened, and the anchor rod back plate can be tightly attached to the sprayed concrete surface.

　　Luoyang Xinben Machinery Equipment Co., Ltd. is a manufacturer of hollow grouting anchor rods . Welcome to buy!