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ROLE AND
IMPORTANCE OF PRE-
FABRICATION IN
PROMOTING
SUSTAINABLE BUILT
ENVIRONMENT
*** Ar Jit Kumar Gupta,
founder Director, College of Architecture , IET Bhaddal,
jit.kumar1944@gmail.com
Buildings- Role
and Importance
Buildings- Role and Importance
 Buildings-- integral part of human history, growth and
development since inception
 Buildings -- would continue to define journey of human
growth and development till posterity
 Buildings-- manmade environment- vital for human growth
 Buildings -- living organism
 Buildings -- as structures cater to all human activities
 Buildings -- largest consumers of energy (50%)
 Buildings - largest consumers of resources
 Buildings – largest generators of waste
 Buildings- largest polluter of environment /ecology
 Buildings responsible for -- largest carbon footprints
 Buildings -- responsible for global warming
 Buildings -- major determinant of global sustainability

Buildings- Role and Importance
 Buildings– providers of optimum/worst living conditions
 Buildings -- make people healthy/sick
 Buildings --critical because 80% human life spent in
buildings
 -- Buildings important to address / overcome human/
ecological concerns
 Making Buildings Sustainable-- critical to make value
addition to resources, environment ,ecology
 Studies made revealed that—
 A well designed/constructed school-- makes learning easy
and more meaningful
 A will designed/constructed house--- makes people happy
and healthy
 A well designed/constructed hospital-- can cure patients
quickly
 A well designed/constructed shopping mall-- can increase
Indian Construction Industry
 Construction industry-major economic driver in India,
 --contributing 11 % share of GDP
 -- second largest industry in India after agriculture
 - --Second largest employment generator
 -- employing 40 million workforce (1/6th working population)
2013,
 --52 million by 2017 and
 -- estimated to be 67 million by 2022.
 -- India 333 b USD construction output in 2015
 - ranked 4th Globally
 --three sectors of construction:--- buildings, infrastructure
and industrial
 Majority of workforce engaged in construction of
buildings
 10 % workforce involved in building completion/ finishing/
electrical, plumbing, other installation services/demolition
and site preparation.
Buildings- Built Environment
--Operational domain of Buildings revolves around:
-- planning, designing, construction, operation,
maintenance, demolition and reconstruction
 -buildings designed /constructed/operated with care
 Buildings – cost /material/resource intensive;
 Buildings – required to be made cost/time efficient,
qualitative, durable , requiring minimum
maintenance/upkeep
 Building Cost-considered in terms of LIFE CYCLE
COST- not initial cost
• --Going green -- a necessity to ensure sustainable
tomorrow
• -- Each building-- unique, requires different options
to make it green
• Architects/ Engineers/builders/developers- have
DEMOGRAPHY-
Global & Indian
Population Scenario- India-2011
Population of India reached
 250 million in 1919
 500 million in 1966 (47 yrs. Later)
 1000 million in 2000 ( 34 yrs. Later)
 1027 million in 2001 (1yr Later)
 1210 million in 2011 (10 yrs. Later)
 Last century-- 5 fold increase in
population
 2050-1600 million -- 50% living in Urban
India.
 --Increased population requires
 --- More buildings-- more housing, --
More educational/ healthcare/ other
institutions
 --More commercial space --More
transportation
 – More Resources
 India annually needs--700-900 million
Typologies of
Construction--
Traditional- On site
Construction-
Issues
Traditional on -site construction-
Issues
 Majority of construction in India follow;
 -- traditional on-site pattern of construction.
 --Known as linear construction,
 -- where every component --not only constructed
on site,
 -- but also completed -before project moves to next
phase.
 Such construction --has major implications in terms
of
 -- time;
 -- cost,
 --quality,
 --safety,
 -- noise,
Traditional on -site construction-Issues
 Human led /human oriented- dictated by
quality of manpower deployed
 Manpower intensive-Large manpower needed
for construction/ supervision
 Loss/theft of material
 Time intensive - Highly time consuming-
 Material inefficient-- Generating large scale
waste
 Weather led--Construction largely dictated
by prevailing weather conditions
 Pollution intensive- creates lot of pollution
 Unsafe - for workers deployed in
construction.
 Material/storage intensive -Large inventory of
Traditional on -site construction-Issues
 Large variation in quality- dependent on work
force deployed
 Resource intensive- Grey Buildings- Use lot
of water/energy –
 Cost inefficient- Increased initial cost of
construction
 Cost overrun-Uneconomical in
cost/resources-
 Time overrun- Delayed return on project
 Construction inefficiency -Unpredictable
project schedule-
 --Large site disruption ;
 Limited application in --hazardous areas
 Adverse impact on surroundings
Pre- Fabrication/
Modular
Construction
Changing Construction Perceptions
Prefabrication-context
 Construction-- has always focus on;
 -- speed , time, economy, efficiency, quality
 -- that can be ensured with
 -- the materials &
 -- techniques of construction.
 -- Prefabrication remains an;
 --amazing technology
 -- that helps to
 --reduce time and provide
 --many more benefits.
What is prefabrication?
 1. Prefabricated construction, or “prefab,”
 -- a method of construction
 --that uses components made off-site
 --in a factory,
 --which then transported
 -- put together on-site to create a structure.
 2. Prefabrication is
 -- the practice of assembling components
 --of a structure
 -- in a factory or other manufacturing site and
 -- transporting complete assemblies /sub-assemblies
 -- to the construction site
 -- where the structure is to be located
Pre- fabrication/Modular
Construction
off-site/modular constructions offers enormous
opportunities
 Overcoming-- disadvantage of traditional construction,
 --Offering advantages in terms of;
 -- cost, time, quality, safety, environment, materials etc.
 Off-Site construction-- is a process that incorporates
 -- pre-fabrication and pre-assembly.
 --creating building components off site
 -- in a designated factory,
 -- shipping to plot/ land and
 -- installing the components to create a finished
structure
Off-site fabrication-- project strategy--
-- changes orientation of project process
--- from construction to manufacture to installation
-- offers numerous benefits for both owners/construction
Rise of Pre-
Fabrication/
Modular
Construction
Rise of Prefabricated
Building
 Prefab building - last real estate cycle/pushed such
construction to prominence
 Second world war, majority of skilled construction
manpower/joined war/ labourers left job,-- due to recession in
construction industry.
 led to shortage of manpower-
 -- large scale construction started after world war
 -- to replace buildings which suffered extensive damage during
war
 --Acute shortage of housing following second world war --led to
a boom in high rise apartments blocks,
 -- builders took to alternate recourse of methods of construction
involving;
 -safe, efficient, cost-effective,quality construction- minimum
manpower.
 -Build projects in-- limited time
-Provide workers-- with safer working conditions
 -- Solutions led to the emergence of prefabricated/ modular
construction.
Rise of Prefabricated
Building
 - Crystal Palace - Britain’s Great Exhibition of 1851- earliest example
of prefabrication/modularization.----design taking less than two
weeks-- construction in few months– using prefab light/cheap
materials iron, wood and glass,-- After exhibition-- palace taken
apart and moved to other location.
 - USA used Quonset huts-- pre-fabricated lightweight all purpose
buildings, for creating accommodation for military globally during the
war,-- which could be shipped anywhere and assembled without
skilled labour.
 U.S.A -- made extensive use of modular construction in
commercial buildings hotels/ offices/ hospitals/schools post ‘70s
when demand exceeded supply
 500-room deluxe Hilton Hotel in San Antonio for Texas World’s
Exposition of 1968-- designed, completed and occupied in just 202
working days. All rooms were placed by crane in 46 days.-- Still
in use, hotel is believed to be the tallest modularly constructed facility
in United States.
 New cruise liner Queen Mary 2--, one of largest/ most expensive
cruise liners in world-- also used modular passenger cabins / VIP
suites -- to ensure all cabins built to higher standards.
Crystal Palace
London
Crystal Palace - Britain’s Great Exhibition of 1851- earliest example of prefabrication/
modularization.----design taking less than two weeks- construction in few months
– using prefab light/cheap materials iron, wood and glass, After exhibition-- palace
taken apart and moved to other location.
lightweight
- USA used Quonset huts, pre-fabricated lightweight all purpose buildings, for
accommodation for military globally during war--could be shipped/ assembled without
skilled labour.
500-room deluxe Hilton Hotel
Texas
for Texas World’s Exposition of 1968-- designed, completed/occupied in just 202
working days. All rooms placed by crane in 46 days. - Still in use, hotel believed
to be tallest modularly constructed facility in United States
Cruise liner Queen Mary
2
one of largest/ most expensive cruise liners in world-- used modular passenger
cabins / VIP suites -- to ensure all cabins built to higher standards.
Corbu Centre Chandigarh
Low Cost Government Housing-
Chandigarh
AKSHARDHAM TEMPLE- Delhi
Pre- Fab Concrete Panels
PRE-Fab Screen
Advantages of
Pre- Fabrication/
Modular
Construction
Pre- fabrication/Modular
Construction/off-site-
Advantages
 Building in Hazardous Area
 Assured Quality Construction
 Material Efficiency
 Cost- Efficiency
 Green Construction
 Flexibility
 Reduced Site Disruption
 Time Efficiency
 Safety
Pre- fabrication- Advantages
 Building in Hazardous Area-----Advantages in remote
area/disasters/ areas hit by disasters where-
 accessibility/manpower/transportation of materials/time
available major problems --best option for construction in
minimum time /cost.
 --In hill areas with extreme climatic conditions--pre-
fabrication help in creating well insulated structures/least
susceptible to extreme outside climate. -Leh, Ladakh,
Lahaul, Spiti
 Assured Quality Construction
 Construction of building components in industrial setting-
 ---- under highly controlled environment
 -- involving lot of quality checks and balances,
 - assured uniform quality unlike site-built structures.
 Modular buildings manufactured-- to code-making owners
Pre- fabrication/Modular
Construction/off-site- Advantages
 Material Efficiency
 Prefabricated buildings known for their material efficiency --both onsite /off-
site..
 -- do not produce waste--material for construction arrives in finished state .
 -- leave/ create very little waste during the manufacturing, assembly,
disassembly
 ---involves just putting together all components-- as per approved design..
 Cost- Efficiency
 Large Capacity to promote economy /cost- efficiency, through;
 -- large discounts received from material suppliers,
 -- reduction in construction time,
 --- mass production of components and
 -- Standardisation,
 ---repetitive nature of operations / large scale operations.
 --Reduction of wastage and in- house recycling of extra materials
 -- less storage cost ,
 -- less material loss
 -- saving on labour hours /manpower cost in construction
Pre- fabrication/Modular
Construction/off-site-
Advantages
 Green Construction
 -Modular buildings require less power compared to traditional
constructions,
 -- lot more eco-friendly-- both in long and short-term.
 --lower life cycle energy implications-- as compared to on-site
construction
 -have minimum use of water-absence of onsite watering of
brick/concrete
 -- Energy efficiency --achieved through using recycled materials
 -- Resource efficient and greener construction process-- due to
reduced material waste/ pollution --increased use of recycled
materials
 Flexibility
 Flexibility based on;
 -- easy dismantling /Relocation of buildings to different sites,
 - Using numerous individual parts–
 permit flexibility in building structure/ design
Pre- fabrication/Modular
Construction/off-site- Advantages
 Reduced Site Disruption
 Traditional construction-- involves major site disruption
 -- since all building processes performed on site
 --Require transporting/storage/mixing of materials/water storage/creating
residential space for labour etc
 --- In prefab construction majority of these disruptions taken away from site
 -- factory manufacturing - reduce traffic, equipment/ material suppliers around
construction site.
 Time Efficiency
 --- taking less than half time when compared to traditional construction
 --due to better planning, reduced site disruptions / quicker fabrication of multiple
components.
 -- Permits multiple projects simultaneously
 -- Reduced on-site construction manpower /supervision --leads to construction
efficiency.
 -- Minimum operation for finishing on site including watering of concrete/ brick walls,
seasoning of wood, painting and polishing of wood/door etc, which minimises time span
for construction
Safety
 Promote safety in building construction
 -including safety of workers at site during construction
Benefits of Pre- fabrication
 Mitigating the labour shortage:
• Already difficult for contractors to find labour
• - but construction still needs to take place.
• - on-site building - decreases labour productivity
• - as work continues piecemeal.
• -Prefabrication helps businesses speed up timelines,
• -- make best of on-site labour,
• -- improve efficiency/success in marketplace.
 . Lower environmental impact:
• --Accelerated offsite production of parts
• -- reduced emissions and work disruption.
• - preserves wetlands or protected areas nearby
• -- minimises local flora and fauna disturbance.
• -- due to dry environment of modular construction
• -- saves water consumption and
• -- allows scrap / other materials to be recycled.
• -- fossil fuel consumption reduced considerably
• -- with less on-site traffic and streamlined transportation.
Benefits of Pre- fabrication
. Flexibility:
-Easy to disassemble /move modular construction
 -- greatly decreases demand for raw materials
 -- minimises resources spent
 - Reduces overall time.
 -- allows versatility in structure’s design,
 -- allowing numerous possibilities.
 Prefabricated building units can be used in
aesthetics can be combined with almost any
Prefabrication
Construction-
Limitations
Pre- fabrication- Limitations
 While prefabrication solves some logistical problems, -- also carries limitations.
 -- Prefabricated components remain limited to a maximum size /weight
 -- since they are to be transported to jobsite.
 Monotony – Risking Choices in design
 Restricting additions and alterations
 Reduced Resale Value
 Roadblock in Financing
 Accuracy and Precision
 High Transportation Cost
 Specialised Machinery- Cranes etc at site for assembly
 Mass Production
 Skilled Manpower and Cost
 Delay/cost-overrun- Co-ordination
 High Initial Cost- higher initial time
 Leakage of joints
 Loss of local Employment- due to requirement of skilled labour
 Requiring high degree of cooperation between project parties- architects, structural engineers
and manufacturers.
• Increased level of depreciation- than standard site- --built housing due to their shorter
economic existence.
EMERGING
CONSTRUCTI
ON
TECHNOLOGI
ES
Emerging Construction Technologies-
2018
 1. Augmented Reality- instead of virtual reality using
augmented reality- you not only visualize real world through a
camera lens, but also add to it– offering endless opportunities
for construction industry
 2. Cloud & Mobile Technology- Being accessible from
anywhere/ connected online– emerging technologies valuable
in construction industry for remaining competitive in market.
 3. Connected Job-- Sites-To make engineers, managers,
surveyors, architects and construction workers connected-
growing software solutions enabling sharing graphics,
measurements / instructions to be passed more efficiently/
in real-time
 4. Construction Management Software—to help manage
business operations including job costing, service
management, project management, scheduling, budgeting,
Emerging Construction
Technologies
 5. Wearable Technology– to help keep workers safe; allows;
passing on the instructions; help track a worker in case of an
accident
 6. Drones-- Save time; quick surveying ; saving labour costs;
ensuring accuracy and precision in readings; less human
involvement necessary.
 7. Smart/Green Construction--If construction process is
streamlined using time / labour sparing technologies; using
solar/wind/ other sustainable energy- easily offset initial cost leading
to clients’ savings.
 8 BIM (Building Information Modelling- enables 3D and4D (time),
5D, 6D, 7D, 8D programming; cost as-built operation; sustainability;
safety--an intelligent, model-based technology -takes a project from
conception to completion
 9. 3D Printing- cost-prohibitive and time to finish a project by this
machine very slow-technology very important for construction
industry going forward.
Aussie brick-laying Robot working
20 times faster than human being
UK construction sector to employ
nearly 5,000 drones by 2030
3D Printing
Technology
Stay Lean with Cloud Based
Technology
Virtual Reality-Google, Samsun
Apple/Facebook/Microsoft working on
technology
PMAY-Technology
Sub – Mission
- Global Housing
Technology
Challenge
Technology Sub-Mission
 A Technology Sub-mission under PMAY set up to; facilitate
adoption of;
 -- modern, innovative/ green technologies /building material
 -- for faster /quality construction of houses.
 - Technology Sub-Mission facilitate;
 -- preparation / adoption of layout designs/building plans
 --suitable for various geo-climatic zones.
 --assist States/ Cities in deploying disaster resistant/
environment friendly technologies
 -- coordinate with various regulatory /administrative bodies
 - for mainstreaming /up scaling deployment of
 -- modern construction technologies /material
 -- in place of conventional construction.
 --coordinate with other agencies
 --working in green /energy efficient technologies, climate
changes etc.
Technology Sub-Mission
 Sub-Mission will work on :
 • Design & Planning
• Innovative technologies & materials
• Green buildings using natural resources and
• Earthquake and other disaster resistant technologies and designs.
 Adopting Simple designs-- ensuring adequate sunlight / air
 - Centre/State to- partner with willing IITs, NITs/SPAs - for developing
 -- technical solutions, capacity building /handholding of States/ Cities.
 --State/ region specific needs of technologies /designs
 -- supported under this Sub-Mission
 A technical cell has been setup in the Building Materials and
Technology Promotion Council (BMTPC)
 54 innovative technologies across world - shortlisted in 6 broad
categories under Global Housing Technology Challenge-India (GHTC-
India),
 Involving construction of over 1,000 houses --in six cities in a span of
Technology Sub-Mission
 IIT Madras made a 3D printed house.
 Indore-- Pre-Fabricated Sandwich Panel System
in place of Brick-and-Mortar Walls.
 Rajkot,- Light House -- made with French
Technology - tunnel Monolithic Concrete
construction technology
 Chennai-- Pre-cast Concrete system
technologies from America / Finland being used.
 Ranchi- houses to be built using 3D Construction
System of Germany.
 Agartala- technology from New Zealand a used that
can withstand major earthquakes -made with steel
WAY FORWARD
Way Forward
 India passing through an era of rapid and massive urbanisation
 coupled with government launching number of missions and yojnas
calling for
 --Housing for all by 2022’;
 -- constructed 6m HHtoilets/4.5 lakh public toilets – Nov3,2018 pan
India-SBM
 --creating markets for street vendors
 --creating home for houseless- 2.95 Mi in rural areas-Average Const
Time reduced from 314 to114 days – 12 Million houses to be const. in
urban areas
 --Skill development Centres for skilling India- under National Urban
Skill & Livelihood Mission;
 --Promoting Rural development under Ru-Urban Mission;
 --Development of 100 cities under Smart City Mission
 -- Development of 12 cities under HRIDAY and AMRUT,
 -- Demand for building is increasing many fold.
 - For achieving defined objectives under these innovative
Conclusion- Way Forward
 Prefabrication known to offer best solutions to
many problems hammering construction
industry.
 Government-- must come out with a well defined
innovative policy & provide incentives to
industry;
 -- to promote state of art construction
technologies.
 - to promote pre-fabrication/modular
construction
 -- Make it integral part of manuals
 - Make it Integral part of study curricula of the
Engineering/Architectural education
 - Create awareness about the pre-fabrication
Conclusion- Way Forward
 --Despite limitations-- prefabricated/precast
construction offers numerous benefits
involving;
 -- optimal materials usage
 - recycling of material/waste
 -- freedom from pollution,
 -- freedom from wind & rain;
 -- improved construction safety;
 -- year round fast construction,
 -- reduced pilferage; better quality control etc
 -- providing a real alternative to on-site
processes.
 --With improvement in manufacturing technology
Conclusion- Way Forward
 -- Committee of experts appointed by National
Research Council of USA identified—
 “Greater use of prefabrication/modularization” as a
key breakthrough opportunity to;
 -- significantly improve efficiency/ competitiveness
of construction industry
 --Overcoming acute shortage of onsite quality
skilled labour
 -- Making structures leaner
 - Making structures qualitative
 - For Making optimum use of prefab technology– --
Evolve/Develop components which can be applied
from project to project;
 --undertaking brain storming session with
client/design team;
 --taking decision to use pre-fab in the beginning of
presentattion Role and Importance of Pre-Fabrication (3).pptx
presentattion Role and Importance of Pre-Fabrication (3).pptx

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presentattion Role and Importance of Pre-Fabrication (3).pptx

  • 1. ROLE AND IMPORTANCE OF PRE- FABRICATION IN PROMOTING SUSTAINABLE BUILT ENVIRONMENT *** Ar Jit Kumar Gupta, founder Director, College of Architecture , IET Bhaddal, jit.kumar1944@gmail.com
  • 3. Buildings- Role and Importance  Buildings-- integral part of human history, growth and development since inception  Buildings -- would continue to define journey of human growth and development till posterity  Buildings-- manmade environment- vital for human growth  Buildings -- living organism  Buildings -- as structures cater to all human activities  Buildings -- largest consumers of energy (50%)  Buildings - largest consumers of resources  Buildings – largest generators of waste  Buildings- largest polluter of environment /ecology  Buildings responsible for -- largest carbon footprints  Buildings -- responsible for global warming  Buildings -- major determinant of global sustainability 
  • 4. Buildings- Role and Importance  Buildings– providers of optimum/worst living conditions  Buildings -- make people healthy/sick  Buildings --critical because 80% human life spent in buildings  -- Buildings important to address / overcome human/ ecological concerns  Making Buildings Sustainable-- critical to make value addition to resources, environment ,ecology  Studies made revealed that—  A well designed/constructed school-- makes learning easy and more meaningful  A will designed/constructed house--- makes people happy and healthy  A well designed/constructed hospital-- can cure patients quickly  A well designed/constructed shopping mall-- can increase
  • 5. Indian Construction Industry  Construction industry-major economic driver in India,  --contributing 11 % share of GDP  -- second largest industry in India after agriculture  - --Second largest employment generator  -- employing 40 million workforce (1/6th working population) 2013,  --52 million by 2017 and  -- estimated to be 67 million by 2022.  -- India 333 b USD construction output in 2015  - ranked 4th Globally  --three sectors of construction:--- buildings, infrastructure and industrial  Majority of workforce engaged in construction of buildings  10 % workforce involved in building completion/ finishing/ electrical, plumbing, other installation services/demolition and site preparation.
  • 6. Buildings- Built Environment --Operational domain of Buildings revolves around: -- planning, designing, construction, operation, maintenance, demolition and reconstruction  -buildings designed /constructed/operated with care  Buildings – cost /material/resource intensive;  Buildings – required to be made cost/time efficient, qualitative, durable , requiring minimum maintenance/upkeep  Building Cost-considered in terms of LIFE CYCLE COST- not initial cost • --Going green -- a necessity to ensure sustainable tomorrow • -- Each building-- unique, requires different options to make it green • Architects/ Engineers/builders/developers- have
  • 8. Population Scenario- India-2011 Population of India reached  250 million in 1919  500 million in 1966 (47 yrs. Later)  1000 million in 2000 ( 34 yrs. Later)  1027 million in 2001 (1yr Later)  1210 million in 2011 (10 yrs. Later)  Last century-- 5 fold increase in population  2050-1600 million -- 50% living in Urban India.  --Increased population requires  --- More buildings-- more housing, -- More educational/ healthcare/ other institutions  --More commercial space --More transportation  – More Resources  India annually needs--700-900 million
  • 10. Traditional on -site construction- Issues  Majority of construction in India follow;  -- traditional on-site pattern of construction.  --Known as linear construction,  -- where every component --not only constructed on site,  -- but also completed -before project moves to next phase.  Such construction --has major implications in terms of  -- time;  -- cost,  --quality,  --safety,  -- noise,
  • 11. Traditional on -site construction-Issues  Human led /human oriented- dictated by quality of manpower deployed  Manpower intensive-Large manpower needed for construction/ supervision  Loss/theft of material  Time intensive - Highly time consuming-  Material inefficient-- Generating large scale waste  Weather led--Construction largely dictated by prevailing weather conditions  Pollution intensive- creates lot of pollution  Unsafe - for workers deployed in construction.  Material/storage intensive -Large inventory of
  • 12. Traditional on -site construction-Issues  Large variation in quality- dependent on work force deployed  Resource intensive- Grey Buildings- Use lot of water/energy –  Cost inefficient- Increased initial cost of construction  Cost overrun-Uneconomical in cost/resources-  Time overrun- Delayed return on project  Construction inefficiency -Unpredictable project schedule-  --Large site disruption ;  Limited application in --hazardous areas  Adverse impact on surroundings
  • 15. Prefabrication-context  Construction-- has always focus on;  -- speed , time, economy, efficiency, quality  -- that can be ensured with  -- the materials &  -- techniques of construction.  -- Prefabrication remains an;  --amazing technology  -- that helps to  --reduce time and provide  --many more benefits.
  • 16. What is prefabrication?  1. Prefabricated construction, or “prefab,”  -- a method of construction  --that uses components made off-site  --in a factory,  --which then transported  -- put together on-site to create a structure.  2. Prefabrication is  -- the practice of assembling components  --of a structure  -- in a factory or other manufacturing site and  -- transporting complete assemblies /sub-assemblies  -- to the construction site  -- where the structure is to be located
  • 17. Pre- fabrication/Modular Construction off-site/modular constructions offers enormous opportunities  Overcoming-- disadvantage of traditional construction,  --Offering advantages in terms of;  -- cost, time, quality, safety, environment, materials etc.  Off-Site construction-- is a process that incorporates  -- pre-fabrication and pre-assembly.  --creating building components off site  -- in a designated factory,  -- shipping to plot/ land and  -- installing the components to create a finished structure Off-site fabrication-- project strategy-- -- changes orientation of project process --- from construction to manufacture to installation -- offers numerous benefits for both owners/construction
  • 19. Rise of Prefabricated Building  Prefab building - last real estate cycle/pushed such construction to prominence  Second world war, majority of skilled construction manpower/joined war/ labourers left job,-- due to recession in construction industry.  led to shortage of manpower-  -- large scale construction started after world war  -- to replace buildings which suffered extensive damage during war  --Acute shortage of housing following second world war --led to a boom in high rise apartments blocks,  -- builders took to alternate recourse of methods of construction involving;  -safe, efficient, cost-effective,quality construction- minimum manpower.  -Build projects in-- limited time -Provide workers-- with safer working conditions  -- Solutions led to the emergence of prefabricated/ modular construction.
  • 20. Rise of Prefabricated Building  - Crystal Palace - Britain’s Great Exhibition of 1851- earliest example of prefabrication/modularization.----design taking less than two weeks-- construction in few months– using prefab light/cheap materials iron, wood and glass,-- After exhibition-- palace taken apart and moved to other location.  - USA used Quonset huts-- pre-fabricated lightweight all purpose buildings, for creating accommodation for military globally during the war,-- which could be shipped anywhere and assembled without skilled labour.  U.S.A -- made extensive use of modular construction in commercial buildings hotels/ offices/ hospitals/schools post ‘70s when demand exceeded supply  500-room deluxe Hilton Hotel in San Antonio for Texas World’s Exposition of 1968-- designed, completed and occupied in just 202 working days. All rooms were placed by crane in 46 days.-- Still in use, hotel is believed to be the tallest modularly constructed facility in United States.  New cruise liner Queen Mary 2--, one of largest/ most expensive cruise liners in world-- also used modular passenger cabins / VIP suites -- to ensure all cabins built to higher standards.
  • 21. Crystal Palace London Crystal Palace - Britain’s Great Exhibition of 1851- earliest example of prefabrication/ modularization.----design taking less than two weeks- construction in few months – using prefab light/cheap materials iron, wood and glass, After exhibition-- palace taken apart and moved to other location.
  • 22. lightweight - USA used Quonset huts, pre-fabricated lightweight all purpose buildings, for accommodation for military globally during war--could be shipped/ assembled without skilled labour.
  • 23. 500-room deluxe Hilton Hotel Texas for Texas World’s Exposition of 1968-- designed, completed/occupied in just 202 working days. All rooms placed by crane in 46 days. - Still in use, hotel believed to be tallest modularly constructed facility in United States
  • 24. Cruise liner Queen Mary 2 one of largest/ most expensive cruise liners in world-- used modular passenger cabins / VIP suites -- to ensure all cabins built to higher standards.
  • 26. Low Cost Government Housing- Chandigarh
  • 28.
  • 29.
  • 31.
  • 33.
  • 34.
  • 35.
  • 36.
  • 38. Pre- fabrication/Modular Construction/off-site- Advantages  Building in Hazardous Area  Assured Quality Construction  Material Efficiency  Cost- Efficiency  Green Construction  Flexibility  Reduced Site Disruption  Time Efficiency  Safety
  • 39. Pre- fabrication- Advantages  Building in Hazardous Area-----Advantages in remote area/disasters/ areas hit by disasters where-  accessibility/manpower/transportation of materials/time available major problems --best option for construction in minimum time /cost.  --In hill areas with extreme climatic conditions--pre- fabrication help in creating well insulated structures/least susceptible to extreme outside climate. -Leh, Ladakh, Lahaul, Spiti  Assured Quality Construction  Construction of building components in industrial setting-  ---- under highly controlled environment  -- involving lot of quality checks and balances,  - assured uniform quality unlike site-built structures.  Modular buildings manufactured-- to code-making owners
  • 40. Pre- fabrication/Modular Construction/off-site- Advantages  Material Efficiency  Prefabricated buildings known for their material efficiency --both onsite /off- site..  -- do not produce waste--material for construction arrives in finished state .  -- leave/ create very little waste during the manufacturing, assembly, disassembly  ---involves just putting together all components-- as per approved design..  Cost- Efficiency  Large Capacity to promote economy /cost- efficiency, through;  -- large discounts received from material suppliers,  -- reduction in construction time,  --- mass production of components and  -- Standardisation,  ---repetitive nature of operations / large scale operations.  --Reduction of wastage and in- house recycling of extra materials  -- less storage cost ,  -- less material loss  -- saving on labour hours /manpower cost in construction
  • 41. Pre- fabrication/Modular Construction/off-site- Advantages  Green Construction  -Modular buildings require less power compared to traditional constructions,  -- lot more eco-friendly-- both in long and short-term.  --lower life cycle energy implications-- as compared to on-site construction  -have minimum use of water-absence of onsite watering of brick/concrete  -- Energy efficiency --achieved through using recycled materials  -- Resource efficient and greener construction process-- due to reduced material waste/ pollution --increased use of recycled materials  Flexibility  Flexibility based on;  -- easy dismantling /Relocation of buildings to different sites,  - Using numerous individual parts–  permit flexibility in building structure/ design
  • 42. Pre- fabrication/Modular Construction/off-site- Advantages  Reduced Site Disruption  Traditional construction-- involves major site disruption  -- since all building processes performed on site  --Require transporting/storage/mixing of materials/water storage/creating residential space for labour etc  --- In prefab construction majority of these disruptions taken away from site  -- factory manufacturing - reduce traffic, equipment/ material suppliers around construction site.  Time Efficiency  --- taking less than half time when compared to traditional construction  --due to better planning, reduced site disruptions / quicker fabrication of multiple components.  -- Permits multiple projects simultaneously  -- Reduced on-site construction manpower /supervision --leads to construction efficiency.  -- Minimum operation for finishing on site including watering of concrete/ brick walls, seasoning of wood, painting and polishing of wood/door etc, which minimises time span for construction Safety  Promote safety in building construction  -including safety of workers at site during construction
  • 43. Benefits of Pre- fabrication  Mitigating the labour shortage: • Already difficult for contractors to find labour • - but construction still needs to take place. • - on-site building - decreases labour productivity • - as work continues piecemeal. • -Prefabrication helps businesses speed up timelines, • -- make best of on-site labour, • -- improve efficiency/success in marketplace.  . Lower environmental impact: • --Accelerated offsite production of parts • -- reduced emissions and work disruption. • - preserves wetlands or protected areas nearby • -- minimises local flora and fauna disturbance. • -- due to dry environment of modular construction • -- saves water consumption and • -- allows scrap / other materials to be recycled. • -- fossil fuel consumption reduced considerably • -- with less on-site traffic and streamlined transportation.
  • 44. Benefits of Pre- fabrication . Flexibility: -Easy to disassemble /move modular construction  -- greatly decreases demand for raw materials  -- minimises resources spent  - Reduces overall time.  -- allows versatility in structure’s design,  -- allowing numerous possibilities.  Prefabricated building units can be used in aesthetics can be combined with almost any
  • 46. Pre- fabrication- Limitations  While prefabrication solves some logistical problems, -- also carries limitations.  -- Prefabricated components remain limited to a maximum size /weight  -- since they are to be transported to jobsite.  Monotony – Risking Choices in design  Restricting additions and alterations  Reduced Resale Value  Roadblock in Financing  Accuracy and Precision  High Transportation Cost  Specialised Machinery- Cranes etc at site for assembly  Mass Production  Skilled Manpower and Cost  Delay/cost-overrun- Co-ordination  High Initial Cost- higher initial time  Leakage of joints  Loss of local Employment- due to requirement of skilled labour  Requiring high degree of cooperation between project parties- architects, structural engineers and manufacturers. • Increased level of depreciation- than standard site- --built housing due to their shorter economic existence.
  • 48. Emerging Construction Technologies- 2018  1. Augmented Reality- instead of virtual reality using augmented reality- you not only visualize real world through a camera lens, but also add to it– offering endless opportunities for construction industry  2. Cloud & Mobile Technology- Being accessible from anywhere/ connected online– emerging technologies valuable in construction industry for remaining competitive in market.  3. Connected Job-- Sites-To make engineers, managers, surveyors, architects and construction workers connected- growing software solutions enabling sharing graphics, measurements / instructions to be passed more efficiently/ in real-time  4. Construction Management Software—to help manage business operations including job costing, service management, project management, scheduling, budgeting,
  • 49. Emerging Construction Technologies  5. Wearable Technology– to help keep workers safe; allows; passing on the instructions; help track a worker in case of an accident  6. Drones-- Save time; quick surveying ; saving labour costs; ensuring accuracy and precision in readings; less human involvement necessary.  7. Smart/Green Construction--If construction process is streamlined using time / labour sparing technologies; using solar/wind/ other sustainable energy- easily offset initial cost leading to clients’ savings.  8 BIM (Building Information Modelling- enables 3D and4D (time), 5D, 6D, 7D, 8D programming; cost as-built operation; sustainability; safety--an intelligent, model-based technology -takes a project from conception to completion  9. 3D Printing- cost-prohibitive and time to finish a project by this machine very slow-technology very important for construction industry going forward.
  • 50. Aussie brick-laying Robot working 20 times faster than human being
  • 51. UK construction sector to employ nearly 5,000 drones by 2030
  • 53. Stay Lean with Cloud Based Technology
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  • 56. PMAY-Technology Sub – Mission - Global Housing Technology Challenge
  • 57. Technology Sub-Mission  A Technology Sub-mission under PMAY set up to; facilitate adoption of;  -- modern, innovative/ green technologies /building material  -- for faster /quality construction of houses.  - Technology Sub-Mission facilitate;  -- preparation / adoption of layout designs/building plans  --suitable for various geo-climatic zones.  --assist States/ Cities in deploying disaster resistant/ environment friendly technologies  -- coordinate with various regulatory /administrative bodies  - for mainstreaming /up scaling deployment of  -- modern construction technologies /material  -- in place of conventional construction.  --coordinate with other agencies  --working in green /energy efficient technologies, climate changes etc.
  • 58. Technology Sub-Mission  Sub-Mission will work on :  • Design & Planning • Innovative technologies & materials • Green buildings using natural resources and • Earthquake and other disaster resistant technologies and designs.  Adopting Simple designs-- ensuring adequate sunlight / air  - Centre/State to- partner with willing IITs, NITs/SPAs - for developing  -- technical solutions, capacity building /handholding of States/ Cities.  --State/ region specific needs of technologies /designs  -- supported under this Sub-Mission  A technical cell has been setup in the Building Materials and Technology Promotion Council (BMTPC)  54 innovative technologies across world - shortlisted in 6 broad categories under Global Housing Technology Challenge-India (GHTC- India),  Involving construction of over 1,000 houses --in six cities in a span of
  • 59. Technology Sub-Mission  IIT Madras made a 3D printed house.  Indore-- Pre-Fabricated Sandwich Panel System in place of Brick-and-Mortar Walls.  Rajkot,- Light House -- made with French Technology - tunnel Monolithic Concrete construction technology  Chennai-- Pre-cast Concrete system technologies from America / Finland being used.  Ranchi- houses to be built using 3D Construction System of Germany.  Agartala- technology from New Zealand a used that can withstand major earthquakes -made with steel
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  • 63. Way Forward  India passing through an era of rapid and massive urbanisation  coupled with government launching number of missions and yojnas calling for  --Housing for all by 2022’;  -- constructed 6m HHtoilets/4.5 lakh public toilets – Nov3,2018 pan India-SBM  --creating markets for street vendors  --creating home for houseless- 2.95 Mi in rural areas-Average Const Time reduced from 314 to114 days – 12 Million houses to be const. in urban areas  --Skill development Centres for skilling India- under National Urban Skill & Livelihood Mission;  --Promoting Rural development under Ru-Urban Mission;  --Development of 100 cities under Smart City Mission  -- Development of 12 cities under HRIDAY and AMRUT,  -- Demand for building is increasing many fold.  - For achieving defined objectives under these innovative
  • 64. Conclusion- Way Forward  Prefabrication known to offer best solutions to many problems hammering construction industry.  Government-- must come out with a well defined innovative policy & provide incentives to industry;  -- to promote state of art construction technologies.  - to promote pre-fabrication/modular construction  -- Make it integral part of manuals  - Make it Integral part of study curricula of the Engineering/Architectural education  - Create awareness about the pre-fabrication
  • 65. Conclusion- Way Forward  --Despite limitations-- prefabricated/precast construction offers numerous benefits involving;  -- optimal materials usage  - recycling of material/waste  -- freedom from pollution,  -- freedom from wind & rain;  -- improved construction safety;  -- year round fast construction,  -- reduced pilferage; better quality control etc  -- providing a real alternative to on-site processes.  --With improvement in manufacturing technology
  • 66. Conclusion- Way Forward  -- Committee of experts appointed by National Research Council of USA identified—  “Greater use of prefabrication/modularization” as a key breakthrough opportunity to;  -- significantly improve efficiency/ competitiveness of construction industry  --Overcoming acute shortage of onsite quality skilled labour  -- Making structures leaner  - Making structures qualitative  - For Making optimum use of prefab technology– -- Evolve/Develop components which can be applied from project to project;  --undertaking brain storming session with client/design team;  --taking decision to use pre-fab in the beginning of