283757893275

524 Barry’s Advanced Construction of Buildings
Handrail protects workers
when pouring and vibrating
concrete
Upper working platform
Steel wallings fixed to
proprietary steel wall panel
Adjustable panel mounted on
rollers
Reinforcement cages erected
against internal formwork before
external formwork positioned.
Cages tied to starter bars
Reinforcement positioned
and formwork bolted and
tied in place
Through tie in sleeve
(holds the formwork
together)
Lower working platform
Formwork girders
Anchor system cast into concrete
walls
Formwork then tied to anchors
Concrete lift shaft walls
Figure 9.6 Climbing formwork platforms (adapted from http://www.peri.ltd.uk).
Concrete lift shafts
Lift shafts are usually square or rectangular (with a corresponding square or rectangular
lift car) and constructed of reinforced concrete. The most common construction method
is to use in situ reinforced concrete to form the walls of the lift shaft. Circular lift shafts
with corresponding circular cars are also available, although not very common.
As noted earlier, the quality of the work carried out on the site is critical to ensure that
the lift shaft is built to the specified tolerances. Tolerances are particularly important where the
lift car and guide rails are to be fixed to the walls and frame. Critical dimensions are the finished
floor to finished floor dimensions (Figure 9.5), the internal size of lift shafts, and the width
and height of the structural opening to the lift shaft. Standard internal sizes of lift shafts
are shown in Table 9.1.