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Larsen & toubro constructions

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  • 1. PRECAST TECHNOLOGY DEFINITION: Precast Technology is Technological innovation suitable for manufacturing process Structural elements are standardized and cast in factory STANDARDIZATION OF ELEMENTS Transported to site on trailers Erected on site by Cranes ELEMENTS ASSEMBLED TOGETHER WITH APPROPRIATE JOINTS
  • 2. PROJECT DESCRIPTION  G+23 Storey fully Precast Residential Building  Total BUA = 1.2 M. Sq.ft.  Divided in to 2 phases viz., Phase 1 – Tower A, B, C (Completed) Phase 2 – Tower D, E, F (Ongoing)  Challenge of Building 24 storied residential towers using Precast in seismic zone 3 in Mumbai. PROJECT BRIEF: Total BUA 1.2 M Sq.ft. Unit Configuration 14-16 Units/ Floor Sub Structure Pile foundation Ground & Terrace Floor Conventional Construction 1st to 23rd Floor Precast Large Wall Panel System
  • 3. SITE LAYOUT Phase - 1 Phase - 2
  • 4. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS 1. DESIGN 2. PRODUCTIVITY ENHANCEMENT 3. SPEED OF CONSTRUCTION 4. STANDARDIZATION 5. QUALITY CONTROL 6. SAFETY 7. SUSTAINABILITY 8. ENVIRONMENTAL BENEFITS
  • 5. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS BEST DESIGN PRACTICES IN ASIA BEST DESIGN PRACTICES IN EUROPE DUCTILITY REQUIREMENTS IN SEISMIC ZONE INDIAN CODAL PROVISIONS DESIGN OF PRAGATI TOWERS IN CONFORMANCE WITH DESIGN PUT TOGETHER TO COMPLETE 1.
  • 6. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS 2. PRODUCTIVITY ENHANCEMENT CONSTRUCTION INDUSTRY FACING SHORTAGE OF SKILLED MANPOWER ADOPTING MECHANIZATION IN CONSTRUCTION L&T ENVISAGED THE SOLUTION IS TO BE MORE DEPENDENT ON MACHINES LEAD TO INCREASE IN PRODUCTIVITY IN PRAGATI TOWERS MANPOWER REQUIREMENT REDUCED BY AROUND 30% AT PRAGATI TOWERS
  • 7. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS 3. Formwork •Stage 1 SPEED OF CONSTRUCTION Reinforcement •Stage 2 Concreting •Stage 3 Blockwork •Stage 4 Plastering •Stage 5 POP works •Stage 6 Painting •Stage 7 Conventional Construction Activities – on site Reduction in the number of activities Precast Construction Casting at yard •Stage 1 Transportation •Stage 2 Erection •Stage 3 Jointing •Stage 4 Painting •Stage 5 Reduction in the number of activities & materials along with reliability on mechanized production lead to increase in speed of construction at Pragati Towers. Reducing the dependency on labour. Savings in Precious Project Time & thereby costs.
  • 8. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS 4. STANDARDIZATION WALL PANELS SLABS PRAGATI TOWERS PODS WALL PANELS SOLID SLAB PANELS POD ELEMENTS BEAMS ENTIRE TOWER WAS BROKEN UP INTO STANDARDIZED ELEMENTS TO GAIN MAXIMUM REPETITION OF MOULDS SPANDREL PARAPET BEAMS COLUMNS COLUMNS STAIRCASE SPANDREL STAIRCASE ALL ELEMENTS WERE STANDARDIZED FOR ECONOMISING CONSTRUCTION AT PRAGATI TOWERS
  • 9. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS 5. QUALITY CONTROL  Precast Elements of Pragati Towers were cast in strictly controlled factory conditions  Rigorous inspection at all stages ensures smooth and high quality finish.
  • 10. ELIGIBILITY FOR ENGINEERING EXCELLENCE PRAGATI TOWERS – HIGH QUALITY INTERIORS
  • 11. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS 6. SAFETY  All Casting activities of Pragati Towers were carried out at ground level
  • 12. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS 7. SUSTAINABILITY  Pragati Towers demonstrated ‘Elimination of activities like brickwork, block work, plastering’ etc at site. Savings in Sand, labour, formwork material, scaffolding material such as wood, timber, plywood etc. Reduction in wastage of materials as casting processes are carried out in stringent quality controlled factory environment. Savings of construction material will not only result in savings of our construction materials but also natural resources from which these materials are derived.
  • 13. ELIGIBILITY FOR ENGINEERING EXCELLENCE – PRAGATI TOWERS 8. ENVIRONMENTAL BENEFITS  Frequent Transportation of construction materials in conventional construction creates congestion in the city and nuisance to the public. ADVANTAGES: Transportation of all precast elements at Pragati site was done during night / off peak hours.  Relief to public as traffic congestion was reduced in jam-packed area of South Mumbai (Parel).  Reduction in nuisances to nearby population like dust, noise, air pollution.  Relief to Motorist.
  • 14. ELIGIBILITY FOR INNOVATIVENESS IN CONSTRUCTION – PRAGATI TOWERS 1. TECHNOLOGY  Potential offered by precast technology was limited to infrastructure projects such as airports, stadiums, bridges, dome roofs, metro projects etc.  Pragati towers demonstrated technical feasibility of using ‘Precast Technology’ for 24 storeyed towers & paved the way of using Precast Technology in Indian Residential Building Construction. First time in India, 24 storied residential building structures are constructed by using Precast Technology KANTEERAVA STADIUM CHENNAI METRO RAIL INFRASTRUCTURE PROJECTS PUTTAPARTHY
  • 15. ELIGIBILITY FOR INNOVATIVENESS IN CONSTRUCTION – PRAGATI TOWERS 2. DESIGN  G+23 Storey ‘Total Precast System’ in Seismic Zone-3, Mumbai.  Designed in conformance to all ‘I.S. codal requirements’.  Structural connections designed to comply with design codes.  Innovative combination of ‘Modular units’ and ‘Large Panel system’ to suit the construction needs of the project.  Designed & Detailed in conformance to I.S. Codal requirements to prevent progressive collapse in Precast system.
  • 16. ELIGIBILITY FOR INNOVATIVENESS IN CONSTRUCTION – PRAGATI TOWERS 3. PRECAST PANEL FABRICATION – ‘INDIGENEOUSLY DEVELOPED MODULAR UNITS’ MOULD - MODULAR BLOCKS MODULAR BLOCKS ( 3D POD) EXPLODED VIEW REAR VIEW INTERIOR CORE TRANSPORTATION
  • 17. ELIGIBILITY FOR INNOVATIVENESS IN CONSTRUCTION – PRAGATI TOWERS 3. PRECAST PANEL FABRICATION – ‘INDIGENEOUSLY BATTERY MOULDS’ MOULD – BATTERY MOULD TOP VIEW • DESIGNED FOR CASTING WALL PANEL ELEMENTS.
  • 18. ELIGIBILITY FOR INNOVATIVENESS IN CONSTRUCTION – PRAGATI TOWERS 4. WATER PROOFING Joint detail should ensure water tightness Monolithic casting of WC & Bathrooms in Pragati Towers ensures water tightness
  • 19. ELIGIBILITY FOR INNOVATIVENESS IN CONSTRUCTION – PRAGATI TOWERS 5. SPEED & SAFETY  Reduction in number of construction activities & Labour requirement helped in achieving higher speed of construction.  Precast Staircases and Slabs offered rapid installation and early safe access to subsequent floors.  Zero accidents at Pragati Towers demonstrates the safety standards.
  • 20. ELIGIBILITY FOR OPERATIONAL EXCELLENCE OF PROJECT – PRAGATI TOWERS 1. RECORD ERECTION TIME  Superstructure (1st Floor to 23rd Floor) of Tower A,B & C completed in a record time of 12 months.  Planned erection = 3 Dwelling Units/day  Peak erection achieved at Pragati Towers = 10 Dwelling Units/day  Precast Technology @ Pragati Towers has addressed the ‘DEMAND & SUPPLY’ issue faced by our construction industry.  Speedy completion reduced time for construction and thereby reducing costs associated with the lifecycle of the project. EXECUTION OF LOGISTIC PLANNING IN CONGESTED AREAS NOISE FREE ERECTION EVEN DURING NIGHT
  • 21. ELIGIBILITY FOR OPERATIONAL EXCELLENCE OF PROJECT – PRAGATI TOWERS 2. REDUCTION IN NUMBER OF ACTIVITIES AT SITE  Elimination of activities like block work, plastering & brickwork reduced the turn around time of the project. 3. LESS LABOUR INTENSIVE  Labour requirement at Pragati site was found to be 30% lesser when compared to a similar conventional construction project (similar magnitude). 4. MOULDS  Battery Moulds – Specialized for high speed of production of Precast Wall Panels without offsets  Flat Bed Moulds – Specialized moulds for Precast Wall Panels with offsets.  Maximum Utilization of Moulds was planned for achieving savings in cost of moulds. INSIDE A BATTERY MOULD FLAT BED MOULD
  • 22. ELIGIBILITY FOR OPERATIONAL EXCELLENCE OF PROJECT – PRAGATI TOWERS 5. RELIEVING TRAFFIC CONGESTION  Reduction in number of repeated trips of materials ( debris, workers, equipment, materials) during day time.  Finished product was transported to site during night/off-peak hours for erection.  Relief to Motorist and nearby population.
  • 23. ELIGIBILITY FOR ADDING SELF RELIANCE OF INDIA IN CONSTRUCTION SECTOR – PRAGATI TOWERS 1. CONVICTION IN CONSTRUCTION TECHNOLOGY  Proved that Precast Technology is feasible for Indian Residential Construction Industry. 2. SERVICEABILITY OF STRUCTURE  Longer Life Span of Structure free from plaster spalls & Wall Cracks 3. INHOUSE DEVELOPMENT FOR PRODUCTION YARD, MOULD FABRICATION  Methods of Mould Fabrication & Yard set up was suitably modified to cater to Indian Construction Industry.  These methods can be used in future to lend cost competitiveness to the future precast projects.
  • 24. ELIGIBILITY FOR ADDING SELF RELIANCE OF INDIA IN CONSTRUCTION SECTOR – PRAGATI TOWERS 4. PROGRESSION IN DESIGN & JOINT DETAILING  Entire ‘DESIGN & JOINT DETAILING’ in accordance to codal provision was developed. 5. WASTE REDUCTION & SUSTAINABLE DEVELOPMENT  Stringent controls in factory based production helped in reducing wastage of materials.
  • 25. ELIGIBILITY FOR KEY IMPACTS THIS PROJECT HAS MADE – PRAGATI TOWERS 1. Proved ‘PRECAST TECHNOLOGY’ is feasible for high rise in seismic conditions. 2. Successfully Addressed ‘The DEMAND & SUPPLY’ gap faced by Construction Industry. 3. Immaculate finishes without compromising cost competitiveness of the Project. 4. ‘AMAZEMENT OF PEOPLE’ to view massive structures erected with great ease. 5. Timely Project Completion
  • 26. ELIGIBILITY FOR FUTURE READINESS OF THE PROJECT – PRAGATI TOWERS 1. ‘FEASIBILITY & ACCEPTABILITY’ of Technology. 2. ‘BRISK PACE’ of Erection of 24 storey towers in a period of 12 months in congested area. 3. ‘ CUSTOMIZATION OF ARCHITECTURAL FINISHES’ as per the requirement of client. 4. ‘INDIGENEOUS DEVELOPMENT IN MOULD DESIGN’ to increase cost effectiveness. 5. ‘REDUCING THE DEPENDENCY OF LABOUR BY INVOLVING TECHNOLOGY OR MECHANIZED CONSTRUCTION.’ 6. MULTIFOLD INCREASE in ‘Quality, Durability, cost effectiveness, speed with high quality end products.’
  • 27. CURRENT STATUS - PRAGATI TOWERS
  • 28. THANK YOU