What pre-use inspection items are required for adjustable screw jacks?

To ensure the safe and stable operation of adjustable screw jacks in scaffolding and formwork support systems,comprehensive quality inspection must be carried out before batch on-site use,including appearance visual inspection,dimensional detection and mechanical performance sampling verification.The first inspection item is appearance quality:check whether the jack rod body has bending deformation,cracks,severe rust and pits;observe whether the base plate and U-head are deformed or cracked;confirm no missing or damaged structural parts.The second item is thread performance inspection:manually rotate the adjusting nut to verify flexible and smooth thread operation without jamming,slipping or stuck phenomena,ensuring free height adjustment.The third item is dimensional precision detection:use professional measuring tools to check rod body diameter,effective adjustment stroke and base plate size,ensuring all parameters meet standard and design requirements.The fourth key item is mechanical performance sampling test:select representative samples from each batch for compression test to detect ultimate bearing capacity and anti-deformation performance,ensuring compliance with engineering load standards.For recycled old screw jacks,inspection standards are more stringent.Reused products may have invisible metal fatigue and micro-cracks even with intact appearance,so sampling rate needs to be increased for secondary performance verification.Defective and unqualified jacks must be screened out and scrapped uniformly,and it is strictly forbidden to reduce standards for use.All inspection results shall be recorded in written files to form traceable quality management data.Standardized pre-use inspection is an important guarantee to eliminate hidden safety hazards and ensure the stable support performance of adjustable screw jacks.

References

GB/T 7714‑2015：

LUO B.Pre-use inspection and quality acceptance specification of scaffolding adjustable screw jacks[J].Engineering Quality,2022,30(10):45-49.

MLA 9th：

Luo,Bin."Pre-Use Inspection and Quality Acceptance Specification of Scaffolding Adjustable Screw Jacks."Engineering Quality,vol.30,no.10,2022,pp.45-49.

APA 7th：

Luo,B.(2022).Pre-use inspection and quality acceptance specification of scaffolding adjustable screw jacks.Engineering Quality,30(10),45-49.