NVC in Block Laying and Concreting - NBTE

NVC in Block Laying and Concreting (Draft)
10-12
2.8 Identify methods of
preventing collapse of
trench.
2.9 Define the angle of
response.
2.10 Identify with sketches the
timbering system for the
following situations.
a. Shallow trench in
moderately firm soil.
b. Shallow trench in loose
soil.
c. Shallow trench in water
logged area.
2.11State necessary precautions
for safe working conditions.
2.12State the reasons of the
following craft practice.
a. Ramping of trench base
before casting concrete
foundation.
b. Casting concrete
foundation.
c. Antiterm application
d. Ramming in layers very
deep refill.
2.13Describe the functions of
foundations.
a. List types of
foundations.
b. Sketch different types
of foundations.
c. Identify their uses.
-Sump hole
-Laying of
perforated pipes.
-Dewatering etc.
-The teacher draws
the timbering
suitable for loose
shallow trench and
gives assignment.
- Teacher names
types of timber
used in timbering
trenches
-Explain safe
working condition
in excavated
trenches
Materials used for
concrete for
foundation.
- Complete
drawing
instrument.
- T-Square
- Pairs of
compass.
- Lesson notes
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