Diploma Courses Assignment Sample
Q1: What are the essential requirements for roof trusses' temporary and permanent bracing? Answer :
Essential requirements for the temporary bracing of roof trusses:
- The first truss must be straight and upright, and securely braced.
- Each successive truss should be spaced correctly and fixed back to the first truss with temporary ties to the top chord at a maximum spacing of 3000mm and to the bottom chord at a maximum spacing of 4000mm.
- Bracing shall be installed at a 45-degree angle to the trusses.
- Before loading, roof trusses must be permanently braced back to the rigid building element.
- Maximum truss centres should be 900mm in wind classification areas up to C3.
- Maximum roof pitch should be of degree.
Q1: Describe the techniques for lifting and positioning trusses.Answer :
The techniques for lifting and positioning trusses are-
For roof trusses less than 30.’
This two-pick point method is recommended for better lifting and positioning the trusses. Ensure the angle span between the two straps is less than 60’.
For slightly longer trusses
Spreader bars can be used for more extended trusses. Tension force keeps these longer trusses flat during lifting and positioning.
Spreader bars or stiff backs can be connected when raising and positioning the trusses.