What are the installation points of anchor rods

In front of you, first strictly inspect the specifications of the tunnel section according to the middle and waist lines. If it does not meet the requirements of the operating procedures, it must be dealt with first; Before starting the operation, it is necessary to first knock on the roof and carefully inspect the surrounding rock of the roof, handle the dangerous rock, and confirm safety before starting the operation. The position of the anchor rod eye should be accurate, and the eye position error should not exceed 100mm, and the eye direction error should not exceed 15 °. The depth of the anchor rod eye should match the length of the anchor rod. When drilling, a mark should be made on the drill bit, and the hole should be drilled strictly according to the length of the anchor rod, with a depth of 2650mm and not fixed. After the anchor rod eye is drilled, the rock debris and accumulated water in the eye should be cleaned up. When drilling, it is necessary to operate under the cover of temporary support. The order of punching should be from the outside to the inside, followed by the top and then the top.

a. Determine the anchor bolt hole position according to design requirements and use drilling tools to drill holes;

b. Blow out the rock powder inside the hole with compressed air;

c. The drilling diameter is required to be 6-12mm larger than the anchor rod diameter;

d. Use anchor rods to feed the anchoring agent into the bottom of the hole, start the stirring device for stirring, and strictly control the stirring time according to the requirements of resin anchoring agent;

e. After reaching the waiting time, tighten the nut。