How To Prevent Pneumatic Anchor Cable Tensioning Failures?

1. Hydraulic System Maintenance
Oil Management: Use 32# or 46# hydraulic oil, replace every 250 hours, and avoid mixing different types of oil.
Seal Inspection: Daily check the seals of oil pipes, joints, and jacks. Replace seals immediately if oil leakage occurs.
Air Bleeding: Run the system several times without load before tensioning to remove air from the oil circuit.
2. Operating Procedures
Axis Alignment: Ensure the jack is coaxial with the steel strand to avoid eccentric loading that could cause slippage or breakage.
Pressure Control: Increase pressure slowly, and strictly prohibit overpressure (the safety valve will automatically relieve pressure when exceeding 63MPa).
Protective Measures: No one is allowed to stand within 45° behind the jack during tensioning.
3. Regular Inspection and Calibration
Pressure Gauge Calibration: Calibrate the pressure gauge every 6 months to ensure accurate readings.
Pressure Holding Test: Conduct a 10MPa pressure holding test before tensioning to verify system stability.
Tool Inspection: Anchorages and clamps must be undamaged, and steel strands must be free from corrosion or deformation.
4. Storage and Maintenance
Dust and Moisture Protection: Oil nozzles must be fitted with dust caps, and stored in a ventilated and dry environment.
Cleaning and Maintenance: Clean the equipment after each shift, coil the oil pipes and store them neatly.
5. Safety Protection
Dual Control Tensioning: Use a dual control mode of stress + elongation value; stop the pump immediately if the deviation exceeds ±5%.
Protective Baffle: Install a steel baffle with a thickness of ≥5mm to prevent steel strand breakage and splashing.