A Self-Learning Manual - Institution of Engineers Mauritius

A Self-Learning Manual
Mastering Different Fields of Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU
13. In the construction of pump troughs for accommodation of screw
pumps, what is the construction method to ensure close contact
between the screw pumps and the pump trough? (P7)
In the construction of screw pump troughs, trapezoidal-shaped troughs are
usually formed by using normal formwork. In order to enhance close
contact between screw pumps and troughs, upon lifting the screw pumps
into the troughs screeding works is carried out. Screw pumps are set to
rotate and screeds are placed between the gap of screw pumps’ blade and
trapezoidal-shaped troughs during the rotating action of screw pumps.
After the screed sets, it serves to prevent leakage of water during the
pumping operation of screw pumps.
Fig. Corbel Beam
14. Given a 1m high staircase resting on solid concrete, would it be
adequate to design nominal reinforcement for the staircase?
For the design of staircase, there are three main scenarios:
(i) Stairs spans longitudinally
This kind of stairs refers to stairs spanning between landings only without
any side supports. In this case, the staircase should be designed as a
beam between two end supports (i.e. landing) and the main reinforcement
is provided at the bottom of staircase slabs.
(ii) Stairs spanning transversely
This kind of staircase is supported by sidewalls only and it may also be
382