MIVAN MIV AN FOR FORMWORK MWORK
Presented Presente d by, by, Sagar D Shah Nirma University
Overview •
Introduction
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Formwork – definition and discussions
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Components and assembly of MIVAN formwork
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Construction with MIVAN
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Work cycle
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Quality enhancements
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Merits and demerits
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Remedies proposed
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Conclusion and Inference
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Bibliography
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Introduction •
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Concept of ALUMINIUM FORMWORK Developed by MIVAN GROUPS, MALAYSIA
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Driving force –speed of construction, quality of construction, seismic resistivity, economy Good quality construction should not deter the project speed nor should it be uneconomical
Cost is long forgotten, but the quality “ Cost ” is remembered forever ”
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Innovation in Constru Construction ction Technolo Technology gy •
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Traditional mode of construction construction - inadequate for mass housing construction. Prone to poor quality control
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Mass housing works – technologies for fast construction to deliver quality, economic and durable structure. Pre-cast and cast-in-sit cast-in-situ u techniques are used for quick construction. Use of Aluminum alloy for formwork
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What is a Formwork? Formwork? •
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Support for plastic concrete when placed, till it gains half of its design strength . Temporary supports and castings
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Forms or moulds or shutters are the receptacles in which concrete is placed, so that it will have desired shape or outline when hardened. Once concrete develops the adequate strength to support its own weight they can be taken out. - ACC 5
Formwork - Requirements •
Sufficiently strong enough
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The joints should be rigid
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Construction lines in the formwork should be true
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Easily removable without damage to itself
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Load Acting On Formwork •
Self weight, Wet concrete weight, Live load, Impact of concrete pour, pour, vibrations. v ibrations.
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Load in bending and shear for frame and joist-370kg/m2.
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Should not deflect deflect more than 0.25 cm. cm.
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MIVAN System •
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3S - SYSTEM OF CONSTRUCTION - Speed, Strength, Safety Column and beam construction – eliminated Walls and slabs are cast in one operation
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Specially designed, easy to handle light weight pre-engineered aluminium forms. Rapid construction of multiple units of repetitiv repetitive e type using semi-skilled labours. Fitting and erecting the portion of shuttering 8
MIV MI VAN For ormwork mwork •
Aluminum alloy panels
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Excellent stiffness-to-weight ratio
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Face or contact surface - 4mm thick plate
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Ribbons 6 mm thick.
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Pin and wedge arrangement system
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Requires no bracing
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High strength wall ties
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Small panels – no heavy equipment
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MIVAN FORMWORK •
Heavy lifting eliminat eliminated ed
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Semi skilled labors
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Fast construction suitable for large magnitudes
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Good quality with accurate dimensions
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System components are durable – repetitive
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Monolithic construction
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Mivan – 4day cycle Conventional – 14 to 20 day cycle
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Comparison – Miv Mivan an and Conv Convention entional al •
More seismic resist resistance ance
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Increased durability
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Lesser number of joints – reduced leakages
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Higher carpet area
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Smooth finishing of wall and slab
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Uniform quality of construction
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Negligible maintenance
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Faster Fast er completion, conven conventional tional stage-to-stage concreting , schedule for
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Construction with MIVAN •
PRE – CONCRETE ACTIVITIES •
Receipt of equipment on site
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Level surveys
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Setting out of formwork
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Control / correction of deviation
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Erect formwork – vertical
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Erect deck formwork
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Checks before Concreting •
Formwork should be cleaned and coated
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Wall formwork erected to the setting out lines
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Openings are of correct dimensions
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Horizontal formwork are in level
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Deck and beam props are vertical
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Wall ties, pins and wedges are all in position
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Surplus material are cleared
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On Concrete Activities •
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Checking pins, wedges and wall ties Beam / deck props adjacent to drop areas slipping due to vibration
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Bracing at special areas slipping due to vibration
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Overspill of concrete at window opening
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Post – Concrete Activities •
Strike down wall form
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Strike deck form
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Clean, transport and stack formwork
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Strike down kicker formwork
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Strike wall – mounted working platform
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All formwork can be struck after 12 hours
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Software Application For Formwork •
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Designed using most optimal panel size , by the use of stateof-art design software. Incorporates optimum assembly procedure ,economical panel selection ,hence minimizing capital and operational cost.
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Flexible in design and can take any architectural and structural form such as bay window, staircase etc.
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Beam components Beam Side Panel
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Prop Head
Beam Soffit Bulkhead
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Deck Components Prop Length
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Deck Panel Deck Mid –Beam
Soffit Length 18
Other Components 2 1 0 2 , 7 2 l i r p A
External Corner Internal Soffit Corner
Internal Corner
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Wall Component Componentss Wall Panel
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Rocker
Kicker 20
Pin and Wedge System •
Pin
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Stub
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Formwork Assembly 2 1 0 2 , 7 2 l i r p A
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Work Cycle •
System Syst em for scheduling & controllin controlling g the work of other connected construction trades
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Deshuttering of the panels – 12 to 15 hrs
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Positioning Positioni ng brackets & platforms on the levellevel- 10 to 15 hrs
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Deshuttered Deshutter ed panels lifted & fixed on floor-7 to 10 hrs
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Kicker & external shutters fixed in 7 hrs
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Shutters are erected in 6-8 hrs
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Reinforcement and – 10 to 12 hrs
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Electrical fittings -10 hrs
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4 Day Cycle •
Day 1: erection of vertical reinforcement bars and one side of the
vertical formwork •
Day 2: erection of the second side of the vertical formwork and
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formwork for the slab •
Day 3: fixing reinforcement bars for slabs and casting of walls and
slabs •
Day 4: removal of vertical form work panels after 24hours, props in
place for 7 days, floor slab formwork in place for 2.5 days
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Design Aspect Aspect Of Mivan: •
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Conventional RC beam column-In case of lateral load more reinforcement required. Column 20 % strong than beam it support (requirement)
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In RC load bearing wall and slab- structure become monolithic box type –suitable for resisting horizontal load.(shear wall).
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Quality Enhancements •
High quality formwork panels - consistency of dimensions
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Level and verticality
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Plastering eliminated
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3mm to 4mm skin coat enough for pleasant appearance
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6mm coat for flooring.
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Merits •
Total system forms the complete concrete structure
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Custom designed to suit project requirements
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Unsurpassed construction speed
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High quality finish
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Cost effective
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Panels can be reused up to 250 times
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Erected using unskilled labour
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Quality and speed - given due consideration along with economy Low maintenance due to monolithic structure , hence very cost effective in long run
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Limitations •
Because of small sizes - finishing lines are seen
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Concealed services become difficult
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Requires uniform planning and uniform elevations to be cost effective
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Modifications are not possible
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Large volume of work is necessary to be cost effective
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Spacers, wall ties - seepage, leakages during monsoon
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Shrinkage cracks
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High heat of hydration – shear walls
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Remedial Measures •
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Wall ties - create holes in wall after deshuttering Box-type construction - shrinkage cracks, near door and window openings in the walls
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Minimize these cracks by providing control strips in the structure which could be concreted after a delay of about 3 to 7 days after major concreting The problem of cracking can be avoided by minimizing the heat of hydration by using Flyash 34
Conclusion and Inference •
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Civil engineers not only build but also enhance the quality of life Creativity and technical skill help to plan, design, construct and operate the facilities essential to life MIVAN - cost effective and efficient tool to solve problems of the mega housing project
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MIVAN construction is able to provide high quality construction at unbelievable speed and at reasonable cost Effective technology – India
“Cost is long forgotten, but the quality is remembered forever” 35
Bibliography •
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http://en.wikipedia.org/wiki/Formwork http://www.reliancescaffolding.com/Wall-Form-works/formwork.asp
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www.mivan.com
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www.mivantelecomms.com/news/?id=42&q
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Thank You
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