PS2c

Prestressing of Precast Concrete - Stressing Operative Procedures

 

This UNIT WILL provide Stressing Operatives with the relevant skills and knowledge to enable them to carry out their duties in a safe manner.

 

This module is to be completed in conjunction with PS2b (Bed Operatives) for all persons involved in stressing activities and at the end of this course, the participants will be able to:

 

Explain the basic theory of prestressing

 

Explain the method(s) of prestressing and the equipment used at the factory

 

Explain what is meant by

• Prestressing load
• Extension
• De-tensioning
• Pre-tensioning
   

Explain the different types of anchor used at the factory
 

Explain and demonstrate de-tensioning method(s)
 

Explain the hazards and risks with

• Prestressing operations

• Tools and equipment used in prestressing

• The working environment

• Materials used during prestressing (COSHH)

 

Explain and demonstrate the equipment used during prestressing operations
 

Explain and demonstrate the relevant checks required by

• Process
• Calibration of single-strand and multi-stressing
• Pre-start
• On-going
• Principles
• Completion
• Frequency
• De-tensioning
• Responsibilities
   

Know their responsibility and how to check

• The equipment is suitable for use
• The tendons are in their correct position and free from damage
• The calibration of equipment
• Ensuring that equipment is cleaned, well maintained and in a serviceable condition

 

Explain the dangers and preventative measures relating to various modes of tendon failure
 

Explain the Near Miss / Incident Reporting Procedure

 

Explain the Safe System of Work in use at the factory

 

This module is assessed through a multiple-choice questionnaire

If a stressing bed is available this may be followed by direct observation of a practical demonstration