Como fazer um bom radier
Autor: EXCLUSIVA MINERAÇÃO E SIDERURGIA | Publicado: 2016-07-07T17:52:00-07:00

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Radier

Nivelamento e posicionamento são
as chaves para um trabalho bem-executado

Edição
171&nbsp;-&nbsp;Junho/2011













Locação topográfica



Se o posicionamento do radier não for feito
corretamente, depois da execução é muito difícil remediar. Assim, uma equipe
deve garantir o correto posicionamento com aparelhos como teodolito ou estação
total.









 

  
  


 



Nivelamento do terreno



Deve ser respeitada uma
tolerância máxima de variação no nivelamento de 1 cm ou 2 cm no momento da
terraplenagem, para evitar consumo excessivo de concreto. É recomendável que um
laboratório acompanhe esta etapa, fiscalizando o grau de compactação do solo.












 

  
  


 





Nivelamento do gabarito



Além da necessidade de se
respeitar a sequência de montagem do gabarito metálico, que já é a fôrma do
radier, seu nivelamento garante a espessura mínima de concreto no pior ponto.
Aqui, o controle também é feito por topógrafo.









 

  
  


 




Tubulação



As tubulações são enterradas com
localização pré-definida no gabarito. Para demarcar a abertura das valas, a
faixa pode ser feita com cal ou areia de outra









 

  
  


 



Espaçamento da ferragem



Se a armação for de tela ou de
barras retas de aço, deve-se tomar cuidado para a ferragem não encostar no
plástico. Isso se faz com espaçadores garantindo o cobrimento mínimo da
armadura.









 

  
  


 



Lona plástica



A lona tem duas funções no
radier: evitar que a água faça percolação ascendente, pois ela infiltraria no
radier e criaria umidade; e evitar perda da água do concreto ou mesmo sua
contaminação com a terra.









 

  
  


 



Acabamento superficial



Mestras metálicas garantem o
nivelamento, e, quando a área de projeção é grande, pode-se posicionar placas
metálicas junto aos gabaritos metálicos, como guia para o sarrafeamento. A
máquina acabadora de superfície deve ser usada quando começa a pega do
concreto, pois depois de endurecido não é possível dar o acabamento, e quando o
concreto está mole não se consegue entrar com a máquina no radier.









 

  
  


 



Apoio
técnico: engenheiro Marcelo Nogueira, gerente de qualidade, e Thiago
Bittencourt, gerente de desenvolvimento de tecnologia da Rossi.