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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
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Related Experiment Video

Updated: Jul 1, 2025

Author Spotlight: Development of a Standardized Acupuncture Tool Inspired by Advanced Techniques for Improved Safety and Precision
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Ordered weighted evaluation method of lifting operation safety risks considering coupling effect.

Kesheng Yan1,2, Lianghai Jin3,4, Xiaoyun Yu5,6

  • 1College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang, 443002, Hubei, China.

Scientific Reports
|March 8, 2024
PubMed
Summary

This study introduces a new safety risk assessment model for lifting operations, identifying key risks like low safety awareness and improper component binding. The findings enhance safety management in construction projects.

Keywords:
Coupling effectInteraction matrixJoint ordered weighted operatorLifting operationSafety risk

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Area of Science:

  • Construction Safety Engineering
  • Risk Management
  • Industrial Safety

Background:

  • Lifting operations are critical in construction but pose significant safety risks.
  • Existing safety control measures for lifting operations require enhancement for accuracy.
  • Accurate evaluation of safety risk degree is essential for improving safety control levels.

Purpose of the Study:

  • To develop a comprehensive system and model for evaluating the safety risk of lifting operations.
  • To identify key risk factors and determine safety risk levels in lifting operations.
  • To provide a reference for safety management and control in lifting operation construction.

Main Methods:

  • Utilized Work Breakdown Structure (WBS) and Risk Breakdown Structure (RBS) to decompose operations and risks.
  • Identified 16 safety risk factors associated with lifting operations.
  • Constructed a safety risk assessment model integrating risk coupling theory, joint ordered weighting operators, and an interaction matrix.

Main Results:

  • The study identified high-risk factors including 'Low safety awareness causes workers to operate illegally' and 'Improper binding of components caused by workers' illegal operation'.
  • The evaluation indicated a significant overall risk level for the lifting operation construction.
  • The assessment results were validated against the actual situation of the Yangfanggou Hydropower Station project.

Conclusions:

  • The developed evaluation system and model are rational and effective for assessing lifting operation safety.
  • The findings offer valuable insights for improving safety management and control on construction sites.
  • The methodology provides a reference for enhancing the overall safety of lifting operations.