The construction of a cast-in-place shelter typically takes between two and three weeks, including the demolition of the mould. The time is also extended by the need for post-tensioning of the vault. The size of the shelter is the main factor affecting the lead time, but the organisation of the site also plays an important role.
In Tampere, one shelter built by A-Perustus went up at an embarrassingly fast rate. The shelter was of course a standard type and quite conventional in size, but the performance is nonetheless stunning. The floor for the shelter was poured on Tuesday and the frame and vaults were poured on Friday. At first glance, this seems an unimaginable feat, so I had to interview the builder about it.
We caught up with Konsta Määtä at the construction site:
''The shelter in question was under severe time pressure and therefore two pairs of workers were used part of the time. However, this does not automatically translate into such significant savings in terms of time, but the professionalism of the workers and the organisational skills of the front man become crucial,'' Konsta says.
The preparatory work on the site also plays a big role in this. These include successful plinth casting, earthworks and plumbing. When all the pieces are in place, a cost-effective result can be achieved, both in terms of time and money.
In the light of the above, the shelter in question has been a work in progress, in every sense of the word. The amount of work is the same regardless of the time.
Specific skills play a big part in success, but this kind of cost-effectiveness is only possible when all the pieces fall into place. Each actor should remember to stay on the same side of the table in a joint project, so that the end product is pristine and everyone wins.
