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The Construction Process of Rock Bolt Support (5 Key Steps)

2025-01-22 Visits:

  The Construction Process of Rock Bolt Support (5 Key Steps)

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  Step 1: Drilling


  - Perform drilling strictly according to design specifications, controlling the position, depth, inclination, and diameter of the holes.


  - Use surveying instruments for positioning to ensure accurate hole placement.


  - Choose appropriate drilling methods and drill bits based on geological conditions to ensure drilling quality.


  - Observe the hole wall condition during drilling to prevent hole collapse and drill jamming.


  Step 2: Hole Cleaning


  - After drilling, promptly clean the hole to remove rock powder, soil, and other debris.


  - Use high-pressure air or water flushing to ensure the hole is clean.


  - Measure the depth of the hole after cleaning to ensure it meets design requirements.


  Step 3: Bolt Installation


  - Inspect the bolts before installation to ensure they are free of damage and corrosion.


  - Slowly insert the bolts into the hole to avoid damaging the bolts or the hole wall.


  - Ensure the insertion depth of the bolt meets design specifications, typically requiring the exposed length of the bolt to not exceed 10% of the design length.


  Step 4: Grouting


  - Prepare the grouting material according to design specifications, strictly controlling the water-cement ratio and the amount of additives.


  - Use appropriate grouting methods, such as pressure grouting or secondary grouting, to ensure grouting quality.


  - Control grouting pressure and flow during the process to avoid excessive pressure causing ground uplift or hole wall collapse.


  - Inspect the grouting effect after completion. If grouting is found to be insufficient or there is leakage, perform supplementary grouting promptly.


  Step 5: Tensioning and Locking


  - Once the grout has reached the required strength as per design, proceed with bolt tensioning and locking.


  - Ensure the tensioning equipment is calibrated for accuracy and reliability.


  - Perform tensioning following the specified sequence and force requirements, applying load gradually without exceeding the design tension.


  - After tensioning, lock the bolt immediately, ensuring the locking force meets design standards.


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