The construction technology of the hollow anchor rod is as follows: natural ventilation inspection of the anchor cable hole → drilling → inserting the hollow anchor rod → moment rod body → installation of grouting device, pad and nut → prestressing tension → grouting.

　　Xinben recommends discussing the construction technology of hollow anchor rods:

　　(1) Hole forming and mud wall protection. Hollow grouting anchor

　　(2) Insert the rod containing the expansion shell anchor head into the bottom of the hole. If the anchor cable must be extended, it can be connected with a coupling sleeve. Hollow bolt manufacturers

　　(3) Pre-rotate the rod body firmly to ensure that the anchor head and the bottom of the hole are close to each other, turn the anchor cable body to the right until it is tightened, and then install the stopper, pad and nut.

　　(4) Connect the special tools for basic prestress tensioning (such as torque wrench, anchor bolt tensiometer), and carry out prestress tensioning to the standard value.

　　(5) Grouting. Send the grouting machine to the spot, connect the grouting pipe and the switch power supply; mix the slurry according to the mortar ratio of the design plan, and pour it into the grouting machine; run the grouting machine to introduce the slurry into the anchor hole until the slurry is from the anchor cable The tail end is discharged, and the grouting working pressure reaches the design plan value; the grouting joint is removed and the equipment is cleaned.

　　Indicate the purpose of grouting: grouting is to encapsulate the hollow bolt body with cement mortar to reasonably avoid the corrosion of the anchor cable body. In addition, the cement mortar fills the gap to improve the soft rock. Therefore, attention should be paid to the quality of grouting to ensure sufficient grouting, and special grouting machines and grouting connectors should be selected to ensure the effectiveness of all prestressed steel reinforcement anchoring system software.

　　The key purpose of fully considering prestressed anchor cable grouting is to avoid rod erosion, fill gaps and improve soft rock. It is proposed to use pure cement mortar with good water permeability for grouting.

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