Placing Concrete ~ this activity is usually carried out by hand with
the objectives of filling the mould, formwork or excavated area to
the correct depth, working the concrete around any inserts or
reinforcement and finally compacting the concrete to the required
consolidation. The compaction of concrete can be carried out using
simple tamping rods or boards or alternatively it can be carried
out with the aid of plant such as vibrators.
Poker Vibrators ~ these consist of a hollow steel tube casing in
which is a rotating impeller which generates vibrations as its head
comes into contact with the casing †
Poker vibrators should be inserted vertically and allowed to
penetrate 75 mm into any previously vibrated concrete.
Clamp or Tamping Board Vibrators ~ clamp vibrators are powered
either by compressed air or electricity whereas tamping board
vibrators are usually petrol driven †
Concreting Plant