Uma laje pré-moldada (também chamada de pré-laje ou laje treliçada) é uma laje de concreto reforçada com espessura mínima de 5-6 cm. Dependendo da cobertura de concreto e armadura, pode-se ter até 7 cm de espessura. A laje é um componente semi pré-fabricado que inclui a armação inferior (requerida por razões estruturais).
A laje é pré-fabricada na fábrica de elementos pré-moldados sob condições ideais e possui a resistência de rigidez torcional (treliça) necessária para conferir a rigidez necessária quando instalada, bem como a resistência à tensão de flexão, longitudinal e transversal, que é necessária à montagem e ao estado final. A laje é transformada em um piso de concreto armado sólido e monolítico utilizando concreto aplicado no local da construção. A espessura final da laje é de 12 a 30 cm dependendo da dimensão do vão e da exigência de carga. A armadura de treliças protuberantes e a própria superfície do concreto fornecem a ancoragem necessária, assegurado a boa ligação e adesão entre a parte acabada e o concreto aplicado na obra.
Independentemente de algumas diferenças na medição da força de cisalhamento, a laje pré-moldada pode ser considerada, a partir de um ponto de vista estrutural, como tendo o mesmo comportamento e propriedades de uma laje produzida no local da obra através do processo de concretagem em formas. Portanto, a laje pré-moldada é capaz de combinar as grandes vantagens de um processo de pré-fabricação com as propriedades das mesmas, quando produzidas em moldes concretados na obra.
Procedimentos de produção
para laje pré-moldada
- Linha de produção
- Sistema carrossel para mesas de cofragem
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