Precast concrete technology adds value and reduce cost of the project as compared to cast in-situ built.
In India, there is a huge demand for housing which neither the cities nor the housing sector is prepared for. The construction industry is also facing problems such as shortage of skilled labour, poor workmanship, low productivity and quality of construction plus time and cost overruns, to name a few. Using precast (pre-engineered pre-cast) concrete method improves the speed of construction and saves huge cost.
Concept of precast construction includes those buildings, where the majority of structural components are standardised and produced in bulk quantity which, later, together with other pieces, becomes part of a larger structure. These precast concrete elements are prepared, cast and hardened at specially-equipped plants with a permanent location in plants at project site or in a location away from the building site, and then transported to the site for assembly.
In order to get the best result from the precast concrete technology, experienced precast architects or structural engineers are required, along with well-trained and experienced erection crews are also must to carry out the site work with utmost satisfaction. Precast concrete products do not need any finishing (such as plastering) on site. By using coloured aggregates and form liners beautiful patterns can be achieved on facades/outer load bearing walls of building.
The precast concrete building technology can be efficiently and effectively used for townships, affordable and low-cost mass housing, IT/ITES parks and SEZs at a much competitive cost and on-time schedule to be adopted in the construction sector of India.
Precast concrete technology adds value and reduce cost of the project as compared to cast in-situ built versus precast:
Plants for pallet circulating system (PCS)/carousel system
In hi-tech and high-capacity computer controlled pallet circulating system/carousel system, the production of solid and sandwich elements is highly flexible. The system has been optimised for production of elements up to 12m in length and 4m in height. The employees specialise on individual working steps and are therefore more reliable and competent at their supervising workstations.
Production pallets are transported between the workstations using two side shifters, two concrete spreaders supplying concrete in either grey or coloured form, two vibrating units ensure that the concrete is compacted correctly and power trowels are used to guarantee smooth surfaces, insulated curing racks with 30 places provide the ideal conditions for element curing. A plotter, cleaning and oiling equipment and tilting station all serve to boost the efficiency of the system.
Concept of a carousel system
Suitable for ground up to fourth floor. Advantage of this method is that it is very low on investment
Suitable ground up to 13th floor. Advantage of this method is that it is average on investment.
Suitable for ground up to 23rd floor. Advantage of this method is: fast construction but little high in investment as compared to above.
About the AUTHOR:
Vijay Shah is a Consultant for Precast Plant and Machinery and its technology.áHe is a mechanical engineer, having 40 years of experience and more than eight years in the precast industry.'He has visited major precast plant manufacturers and their clients in the world.
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