From Loading To Positioning: Key Points For Collision Prevention Throughout The Pre-insulated Casing Handling Process
Standard operating procedures mandate keeping each pre insulated sleeve intact from transit through final positioning. Preventing dynamic impacts, drop force, and direct shear stress safeguards insulation resistance and ensures long-term underground system reliability.
Transit and Handling Risk Points
Handling high-voltage line components introduces physical risks during physical transport. Dropping equipment during offloading or allowing motion shift on truck beds creates fractures across outer jackets.
Impact shocks damage internal phase connectors instantly. Sharp tool strikes or rough sling contact break water barriers, creating unseen moisture paths before trench installation even starts.
Damage Prevention Equipment Comparison
| Equipment Choice | Risk Level | Protection Level | Standard Application |
|---|---|---|---|
| Textile Webbing | Low | High | Surface Lifting |
| Unprotected Steel Chains | High | Low | Heavy Rigging |
| Padded Guide Rails | Low | Medium | Trench Insertion |
Collision Prevention Operation Process
Phase 1: Transit Securing and Unloading
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Apply custom textile slings across outer jackets instead of bare steel chains to eliminate point-pressure crushing.
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Space soft rubber spacers between stored units inside transport crates to limit sideways movement during vehicle stops.
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Verify crane swing paths to keep the pre insulated junction sleeve clear of trailer walls or concrete barriers.
Phase 2: Underground Trench Positioning
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Clear rocks, exposed rebar, and debris from trench bottoms before lowering components into place.
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Lower assembly units vertically using dual-tag lines to stop rotational swinging inside narrow excavation trenches.
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Guide every insulated joint sleeve gently onto cushioned support pads to keep outer layers free from abrasion damage.
Post-Placement Quality Checks
Field technicians inspect every shell visually for micro-cracks or deep gouges right after final alignment. Immediate continuity testing verifies electrical insulation before backfilling commences. Proper physical care preserves structural integrity, preventing premature dielectric breakdown underwater.
