Introduction of Prefabricated structures
Download as PPTX, PDF10 likes3,954 views
Prefabrication involves assembling building components in a factory and transporting them to the construction site. It aims to reduce costs, improve quality, and speed up construction. Advantages include reduced work time, fewer workers needed, and omitting interruptions. Limitations include size restrictions and transport difficulties. Modular coordination standardizes dimensions. Precast construction allows for industrial quality control while limiting on-site space needs and waste.
Introduction of Prefabricated structures
- 1. PREFABRICATED STRUCTURES BY- S Yogesh 15MST1003 VIT University, Chennai Campus
- 2. Prefabrication is the practice 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 effect economy in cost To improve quality To speed up construction since no curing is necessary To use locally available materials
- 4. Advantages Work time is reduced Less workers needed Work done with better technology Interruption in connection can be omitted
- 5. Limitations size of the 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.
- 6. Materials of Construction Materials like concrete, steel, hard wood, aluminium etc… Special characteristics while choosing materials - Easy available - Economy - Easy workability - Light weight - Durability
- 7. MODULAR COORDINATION Modular coordination is a concept of coordination of dimension and space in which building components are positioned in terms of MODULE(M). 1M= 100mm
- 8. DIMENSIONS OF PRE FAB 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)
- 9. • 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
- 10. • Lintels – Length – multiple of 1M – Width – multiple of M/4 – Depth – multiple of M/4 • Sunshade – Length – multiple of 1M – Projection- multiple of 1M
- 11. The following aspects of 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
- 12. 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
- 13. A Government of India 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
- 14. HPL has a modern 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
- 15. HPL had designed and built many prestigious Institutional buildings. These comprise Schools, Colleges, Training Centres, Hospitals, Office Complexes and Airport Terminal Buildings.
- 16. The National Academy for 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.
- 18. Conclusion o Reduce adverse environmental 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.