ANÁLISE DE LAJES DE SUBPRESSÃO EM OBRAS DE JOÃO PESSOA - PB

Abstract

It has been noticed in João Pessoa and further coastal cities that sandy beach soils are being largely occupied by buildings in which parts of the structure are built underground for a better space optimization. In some cases these constructions involve excavations that reach the water table or at least staying close to it. For this reason it is important to protect the building against the water. This protection can be done by using permanent drainage systems or anti-flotation slabs. This latter has been largely used in João Pessoa and needs special care on procedures like groundwater drawdown, structure waterproofing, project development and concreting operations. This work intends to detail these procedures and contribute to reduce problems and pathologies on the structure and to make it safer and with a better durability. A literature review was done as well as an analysis of cases in the city of João Pessoa that use anti-flotations slabs. It was also analyzed a case that uses permanent drainage system which is an alternative solution for these slabs. And a comparison between them was done. It was noticed that the cases that use the anti-flotation slabs were properly projected and executed and don’t present problems and pathologies that may cause damage to the structure. It was also noticed that the use of anti-flotation slabs is more viable than the use of permanent drainage systems when considering a long period of time because this last one is less durable and leads to high expenses with energy