Introduction of Prefabricated structures

Introduction of Prefabricated structures

• 1.
  PREFABRICATED STRUCTURES BY- S Yogesh 15MST1003 VITUniversity, Chennai Campus
• 2.
  Prefabrication is thepractice of assembling components of a structures in a factory or other manufacturing site and transporting complete assemblies or sub assemblies to the construction site where the structure is to be located. Definition
• 3.
  Aim  To effecteconomy in cost  To improve quality  To speed up construction since no curing is necessary  To use locally available materials
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  Advantages  Work timeis reduced  Less workers needed  Work done with better technology  Interruption in connection can be omitted
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  Limitations  size ofthe units.  location of window openings has a limited variety.  site access and storage capacity.  require high quality control.  enable interaction between design phase and production planning.  difficult to handling & transporting.
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  Materials of Construction Materials like concrete, steel, hard wood, aluminium etc…  Special characteristics while choosing materials - Easy available - Economy - Easy workability - Light weight - Durability
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  MODULAR COORDINATION Modular coordinationis a concept of coordination of dimension and space in which building components are positioned in terms of MODULE(M). 1M= 100mm
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  DIMENSIONS OF PREFAB COMPONENTS • Flooring and Roofing – Length- multiple of 3M – Width – multiple of 1 M – Thickness – multiple of M/4 • Beams – Length – multiple of 3M – Width – multiple of M/4 – Depth – multiple of M/4 As per IS 15916(2011)
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  • Column – Height– multiple of 1M for height up to 2.8m and height above 28m is multiple of 2M – Lateral dimension- multiple of M/4 • Wall - Thickness – multiple of M/4 • Staircase – Width – multiple of 1M
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  • Lintels – Length– multiple of 1M – Width – multiple of M/4 – Depth – multiple of M/4 • Sunshade – Length – multiple of 1M – Projection- multiple of 1M
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  The following aspectsof pre fabrication system: a)Effective utilization of spaces b) Straight and simple walling scheme c) Limited sizes and numbers of components d) Limited opening in bearing walls e) Regulated locations of partitions; f) Standardized service and stair units; g) Limited sizes of doors and windows with regulated positions
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  Comparison Site-cast  no transportation the size limitation is depending on the elevation capacity only  lower quality because directly affected by weather  proper, large free space required Precast at plant transportation and elevation capacity limits the size- higher, industrialized quality – less affected by weather  no space requirement on the site for fabrication unlimited opportunities of architectural appearance
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  A Government ofIndia Enterprise  ISO 9001: 2008 certified company was incorporated in 1953  HPL has built a wide spectrum of civil engineering structures using both conventional in-situ as well as prefab techniques and  supplied components for the building industry & the national railways  It also became the first company to produce precast pre stressed concrete railway bridge girders for making railway bridges in the country
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  HPL has amodern factory for manufacturing precast concrete products, which includes the following. 1) Precast pre stressed concrete products like Railway Sleepers and Electric Poles. 2) Autoclaved aerated cellular concrete. These are light weight yet have sufficient strength for walling and other applications. 3) Reinforced concrete products like pavements slabs, frames, water tanks, bridge girders, interlocking solid blocks for pavement & for retaining walls, kerb stone etc. 4) Timber joinery components and wood substitute items manufactured with wood/medium density fibreboard in the company’s timber workshop
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  HPL had designedand built many prestigious Institutional buildings. These comprise Schools, Colleges, Training Centres, Hospitals, Office Complexes and Airport Terminal Buildings.
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  The National Academyfor Training and Research in Social Security (NATRSS) is a training centre with class rooms, auditorium, offices, lecture theatres, hostel block, health club, swimming pool and underground parking with a total covered area of 7200 sq. meters The project cost was INR 62.4 Million.
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  Conclusion o Reduce adverseenvironmental impact on sites. o Enhance quality control of concreting work. o Reduce the amount of site labour. o Increase worker safety . o The use of precast concrete construction can significantly reduce the amount of construction waste generated on construction sites.