QUESTION 7
(a)  Drains up to DN 10 mm laid on a grade between 20% (1 in ) and vertical require anchor
blocks (thrust blocks) to be installed. They shall be of reinforced concrete.
(i)  On the following elevation, draw in relevant anchor blocks (thrust blocks). Label and
include all measurements, reinforcement, position and profile associated with the
anchor blocks (thrust blocks).   

PLEASE SEE PDF FOR IMAGE

(3 marks)
(ii) State how the anchor blocks are positioned in the trench.


(1 mark)
(b)  State the type of joint that anchor blocks must not cover.


(1 mark)
(c)  State the maximum distance between anchor blocks which are being installed on an
inclined drain.

(1 mark)
Total 6 marks

Linkback: https://forum.plumbers.nz/drainlaying-exam-june-2007/28/question-7/198/