building construction Paper 2 May/June 2015

Question 1

  • a)   State one reason for using each of the following mechanical equipment on a construction
  • site.

  • Bulldozer
  • Mechanical auger;
  • Backacter.
  • b)   With the aid of sketch, describe how a wall line is transferred from a profile board onto a concrete foundation.

  • List three materials used for preventing dampness in substructural works.
  • Most candidates were able to state the use of a bulldozer and mechanical auger correctly. However, few of them succeeded in making a sketch on how a wall line is transferred from a profile board onto a concrete foundation.

    Observation

    The expected response to question 1 is as given below; 
    (a)        One use of each of the following mechanical equipment:
    (i)         Bulldozer:

    • for demolition work;
    • for shallow excavation;
    • clearance of shrubs and small trees;
    • use as a pusher for scraper machine;
    • used as towing tractor;
    • used for earth moving/soil.

    (ii)         Mechanical auger:

    • drilling holes in the rocks for explosives;
    • boring holes for pile foundation;
    • boring holes to obtain soil/rock samples;
    • for taking soil samples.

    (iii)        Backacter:

    • for basement excavation;
    • foundation trench excavation;
    • for bulk excavation;
    • for deep excavation.

    (b)

    (c)      Materials used for preventing dampness in substructural works:

  • sheet lead/lead;
  • copper sheet/copper;
  • engineering bricks;
  • bitumen base product;
  • polythene;
  • mastic asphalt;
  • pitch polymer;
  • slates;
  • emulsion;
  • emulsified asphalt;
  • bituminous felt.