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.
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New Caledonia, the dream island, relies on precast concrete construction
New Caledonia, the French archipelago in the South Pacific, 2,000 km away from the Australian coast is among the world's most popular vacation destinations with temperatures between 20 and 30°C and gorgeous beaches and diving resorts. In pursuing the construction of new buildings for residential areas, public administration and touristic projects , state-of-the art precast production techniques are used. Architecturally attractive single-family homes, multi-storey residential buildings will be produced as well as hospitals, schools, entire hotel complexes and industrial halls. The precast plant of the LBDP Group in New Caledonia completed in April 2014 will produce floor slabs and double/sandwich walls as well as columns and beams in future.
Precast concrete parts for the emerging India
The Indian construction company Precast India Infrastructures Pvt Ltd. has responded to the high demand from the local construction industry for solid walls, solid floors and floor slabs by opening a new production plant. The state-of-the-art pallet circulation system in the city of Pune in Western India is designed for an hourly production capacity of up to 120 m2 precast concrete parts. The production technology was supplied by Vollert Anlagenbau.
The new CDLP precast plant in France impresses by its intelligent work processes
In order to be able to produce precast floor slabs and double walls economically and to be able to react flexibly to fluctuating demands, CDLP focused from the outset on a sustainable plant concept with flexible work processes that had been thought out to the end. The plant, which was completed at the end of June 2011, is therefore tailored precisely to the environmental conditions and to the precast concrete elements to be produced.
Hitting the „Wall“ on the Head for Success
It took SPL in France no more than a few weeks to begin manufacturing precast concrete floor slabs and double walls on the new production plant. Vollert has left with SPL the most competent and experienced impression for the overall planning in its capacity as machine builder and general contractor and supplier of know-how. The market entry into the new activity field started from the very beginning without any difficulty, hence.
Precast factory explore manufacturing, Laing O’Rourke
Laing O’Rourke is the largest privately owned construction solutions provider in the UK. In March 2010 the company opened „Explore Industrial Park“, a state-of-the-art new precast factoriy in the East Midlands, built to strengthen the company’s offsite manufacturing capabilities and to support its construction projects across the UK.
Flagship Factory for the Precast Industry of the Kingdom of Saudi Arabia
Being the official production start date of Alabniah Precast Concrete Buildings Factory the 1st of January 2010 is a date not only starting a new decade but also a date where the Saudi Arabian precast concrete industry sees the most advanced and largest factory of its kind in the Kingdom starting off. The factory located in the Second Industrial Area of Dammam is the first of its kind in Saudi Arabia offering the combined advantages of state of the art modern production technology, high capacity and wide product range to deliver complete building
systems and precast components into the market.
Gocrete: a company gets in shape for the future
In March 2008, Gocrete put into operation a state-of-the-art production plant for precast concrete components in the Perth area, the most modern in Western Australia. In addition to floor slabs, solid walls are also produced in a very limited space and in an economical fashion on the basis of the latest findings concerning safety at work.
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