CONSTRUCTION PROCESS 1من اصل6

the structural system is developed together with the construction method to realize the
freeform geometry in rational and efficient manner, the free form concrete surfaces are
shotcrete (spray concrete), it is commonly utilized for tunnel construction and suitable
for curved sur face. it can be shot horizontally or vertically. rather than constructing
doubly curved formwork that is expensive and time consuming on site, the temporary
structure in the void creates faceted surfaces that best- fit the finished surface,
between the temporary steel work, expanded metal mesh is expanded metal mesh spans
between the temporary steel work to act as faceted formwork. 150 mm thick concrete
can be shot at one time.
the surface layer of 25 mm is shot sepa rately without large aggregate to achieve
smooth surface finish, concrete thickness varies between 200 mm at the top floor and
350 mm at the bottom, sprayed concrete construction method typically, an expanded
metal mesh is used as a permanent back shutter to which the the reinforcing mesh is
affixed, the con crete is sprayed onto the expanded metal and the reinforcement is fully
enclosed, the concrete is typically sprayed using one of two methods, with the dry
process, the dry constituents of the concrete are mixed in a portable batching plant and
the water is added to the mix at the nozzle, with the wet process, the water is added to
the batching plant and premixed with the dry constituents and the wet concrete is
sprayed from the nozzle, the benefits of the wet process are that there is greater control
over the concrete mix as the concrete is often mixed offsite by ready-mix contractors
and delivered in lorries.
it is common practice to apply the concrete in two layers, the first thick layer is usually
applied using the wet process,