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Solutions for Excessive (Excessive/Insufficient) Elongation

Release time:

2025-08-20

Calculate theoretical elongation based on measured elastic modulus Check clamping plate hardness and stop plate height

Most Common and Most Problematic

Undersized (<-6%):

- Duct blockage, high friction

- Strand twisting, bundle jamming

- Misaligned anchor plate, uneven flaring

Solution:

- Pre-clear and clean the duct

- Feed strands straight without twisting

- Adjust anchor plate position to ensure proper alignment

Excessive (＞+6%):

- Actual elastic modulus is too low

- Loose tensioning end, clamping plates not securely engaged

- Excessive retraction

Solution:

- Calculate theoretical elongation based on measured elastic modulus

- Check clamping plate hardness and stop plate height

- Hold the load for 3–5 minutes after tensioning before applying pressure to anchor

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Common Safety Hazards (Important to Note)

1. Personnel at the tensioning end → Do not stand directly behind the jack 2. Stranding rebound → Install protective barriers

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Solutions to Common Issues with Front Car Jacks (the 27t/30t models you asked about earlier)

Apply anchor release agent and replace the tool anchor regularly; retract slowly.

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Excessive retraction of the steel strand

Replace with qualified clamping plates Adjust the height of the stop plate

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Solutions for Poorly Compacted Grout, Voids, and Grout Leakage in Ducts

Ensure accurate cement slurry mix proportions and control the slump between 14 and 18 seconds. Use vacuum-assisted grouting with a negative pressure of -0.06 to -0.08 MPa.

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Solution for Asynchronous Tensioning (Tensioning at Both Ends)

Significant pressure difference between the two ends; the elongation values do not match.

2025-11-15