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© 2019 Rafael Sacks
Construction Tech: Innovation Founded on Lean Theory and BIM Technology
Prof. Rafael Sacks
Constructs: digital innovation in the built environment | 2018-19 Keynote Lecture Series
UCL, London, UKTuesday, 5th February, 2019
© 2019 Rafael Sacks
Construction Tech: Innovation Founded on Lean Theory and BIM Technology
In this decade, we are witnesses to a surge in innovation in
construction. Some of that innovation has emerged within
existing architectural, engineering and construction
companies, and some from established software vendors,
but the most exciting developments are in Construction
Tech startup companies. Most of these build directly on the
theoretical and technological foundations provided by Lean
Construction thinking and BIM technology. In this keynote
lecture, Rafael Sacks will review some of the most
promising innovations, tracing their development back to
the fundamental and applied research in academia and in
industry that make them possible.
2
To download the slides….
© 2019 Rafael Sacks
Seskin Virtual Construction Lab
3
To study, model, experiment with and understand the flow of work and trade crews in complex construction projects
Observations, action research, process mapping and modeling, management games (LEAPCON), discrete event simulation, agent-based simulation (EPIC)
Lean Construction
https://youtu.be/erSqpbFswIk https://youtu.be/NmF0dp-Bm2g
Sacks, R., (2016). ‘What constitutes good production flow in construction?’, Construction Management and Economics, Vol. 34, No. 9, pp. 641-656.
© 2019 Rafael Sacks
Seskin Virtual Construction Lab
4
To study, model, experiment with and develop BIM technology, process and people
Building Information Modeling (BIM)
IFC and interoperability, BIM tools, virtual reality, BIM education, adoption, and standards, semantic enrichment and model checking
https://youtu.be/KJPnYKghqlw
Sacks, R., Eastman, C.M., and Lee, G., (2004), ‘Parametric 3D Modeling in Building Construction with Examples from Precast Concrete’, Automation in Construction, Vol. 13 No. 3 pp. 291-312.
© 2019 Rafael Sacks
Seskin Virtual Construction Lab
5
To propose, define, develop and test BIM-enabled systems to support production planning and day to day production control on construction sites
Lean and BIM synergies
Prototyping (KanBIM, iKAN), field experiments, ‘Virtual Construction Site’ experiments
Sacks, R., Koskela, L., Dave, B. and Owen, R.L., (2010). ‘The Interaction of Lean and Building Information Modeling in Construction’, Journal of Construction Engineering and Management, Vol. 136 No. 9 pp. 968-980.
https://youtu.be/FZ3XRfXmeGE
© 2019 Rafael Sacks 6
BIM Handbook, 3rd EditionChapter 7
© 2019 Rafael Sacks
Construction Tech startup companies
7
29
51
85 84
126
184
0
20
40
60
80
100
120
140
160
180
200
2010 2011 2012 2013 2014 2015
Num
ber o
f con
stru
ctio
n te
chno
logy
sta
rtup
com
pani
es
foun
ded
Daqri
WinSun
Atlas44
Fieldwire
Flux Factory
BuildingConnectedGreentown
PlanGrid
Ofbusiness
Buildzar
EquipmentShare
Rhumbix
Data source: Tracxn Technologies Private Limited.
© 2019 Rafael Sacks 8Construction Tech Sector Funding Rises As Prescient Raises $50M MoreMary Ann Azevedo, Crunchbase News, October 24, 2018
Construction Tech startup investment
© 2019 Rafael Sacks
Construction Tech
Paths of Innovation• Within design and construction companies
• Within software companies
• Startup companies
• ….. acquisitions (Revit, PlanGrid, etc.)
9
High Tech Industry
Low Tech Industry
No Tech Industry ?
© 2019 Rafael Sacks 10
© 2019 Rafael Sacks 11
© 2019 Rafael Sacks 12
© 2019 Rafael Sacks 13
© 2019 Rafael Sacks 14
© 2019 Rafael Sacks 15
© 2019 Rafael Sacks
The House of Construction Tech
16
Information Theory
Lean Production
Theory
Design Theory
Theory piles
Tech
no
logy
Bu
sin
ess
Pro
cess
Nee
d
Entr
epre
ne
urs
hip
Construction Tech columns
Ideas, Investment, ImplementationInnovationbeams
AdoptionAdoption roof
BIM Technology, Processes, PeopleBIM foundation
© 2019 Rafael Sacks
Lean Construction
Theory of production in construction
o Waste
o Transformation, Flow and Value (TFV)
o Craft, Mass, Industrial, Lean Construction
o Portfolio, Process and Operations Model (PPO Model)
17
© 2019 Rafael Sacks
Can you see the waste?
18
© 2019 Rafael Sacks
Can you see the waste?
± 0.00
+4.60
19
© 2019 Rafael Sacks
Can you see the waste?
20
© 2019 Rafael Sacks
Can you see the waste?
21
© 2019 Rafael Sacks
And here?
22
© 2019 Rafael Sacks
Laying blocks
32%
Scaffold2%
Marking out7%
Cutting blocks
24%
Fixing ends3%
Moving blocks
4%
Cleaning10%
Move between
floors0%
Rework11%
Changes7%
Work Hours
Quantifying the waste
23
© 2019 Rafael Sacks
TFV Theory
T – Transformation
F – Flow
V – Value
24
Koskela, L., 2000. An exploration towards a production theory and its application to construction(D. Tech). Helsinki University of Technology, Espoo.
24
© 2019 Rafael Sacks
Flow
Process A
Inspection
Moving
Waiting
Scrap
Process B
Inspection
Moving
Waiting
Scrap
Lean thinking emphasizes the flow of products in production. But what flows in construction?
© 2019 Rafael Sacks 26
Operations (Operators and Equipment)
Joining
Moving
Cutting
Raw Material Stock
Waiting
Waiting
Product Stock
Theory of production
Shingo, S. (1992). The Shingo Production Management System: Improving Process Functions. Taylor & Francis.
© 2019 Rafael Sacks
Theory of production in construction
Locations
A3
Project AResources
Materials
Information A2
A1
What flows in construction?
Sacks, R., (2016). ‘What constitutes good production flow in construction?’, Construction Management and Economics, Vol. 34, No. 9, pp. 641-656.
27
© 2019 Rafael Sacks 28
Construction Flow Index (CFI)
Flow line chart of project H1 (hospital project with good production flow).
Theory of production in construction
Sacks, R., Seppänen, O., Priven, V., and Savosnick, J., (2017). ‘Construction Flow Index: A Metric of Production Flow Quality in Construction’, Construction Management and Economics Vol. 35, No. 1-2, pp. 45-63.
© 2019 Rafael Sacks 29
Projects, processes, operations
The CPM Mental Model
The Process Mental Model
The Real World ?
Bertelsen, S., and Sacks, R. "Towards a new Understanding of the Construction Industry and the Nature of its Production," 15th
Conference of the International Group for Lean Construction, East Lansing, Michigan, 46-56.
© 2019 Rafael Sacks 30
Portfolio, Process and Operations (PPO) Model
What flows in construction?
Sacks, R., (2016). ‘What constitutes good production flow in construction?’, Construction Management and Economics, Vol. 34, No. 9, pp. 641-656.
Locations
(Process)
Project
Resources
MaterialsDesign Information
© 2019 Rafael Sacks 31
Portfolio, Process and Operations (PPO) Model
What flows in construction?
Sacks, R., (2016). ‘What constitutes good production flow in construction?’, Construction Management and Economics, Vol. 34, No. 9, pp. 641-656.
Locations
(Process)
Project
Resources
MaterialsDesign Information
Project axis
© 2019 Rafael Sacks
Processes
Location Flow
Operations
Trade Flow
Portfolios
Flow of
Projects
ProcessesLocation Flow
OperationsTrade Flow
PortfoliosFlow of Projects
PPO Model of flow in construction
Sacks, R., (2016). ‘What constitutes good production flow in construction?’, Construction Management and Economics, Vol. 34, No. 9, pp. 641-656.
PPO Model
What flows in construction?
32
© 2019 Rafael Sacks
Portfolio, Process, Operations Flow Simulation
33
© 2019 Rafael Sacks 34
© 2019 Rafael Sacks
BUILDING INFORMATION MODELINGTHEORY AND PRACTICE
35
© 2019 Rafael Sacks
First concepts
o Eastman, C., (1975) “Building Description System”, AIA Journal
36
“Designing would consist of interactively defining elements… It should be possible, then, to derive sections, plans, isometrics or perspectives from the same description of elements… Any change of arrangement would have to be made only once for all future drawings to be updated. All drawings derived from the same arrangement of elements would automatically be consistent… any type of quantitative analysis could be coupled directly to the description. All data preparation for analyses could be automated. Reports for cost estimating or material quantities could be easily generated… Thus BDS will act as design coordinator and analyzer, providing a single integrated database for visual and quantitative analyses, for testing spatial conflicts and for drafting. … Later, one can conceive of a BDS supporting automated building code checking in city hall or the architect’s office. Contractors of large projects may find this representation advantageous for scheduling and materials ordering.”
The Use of Computers Instead of Drawings
© 2019 Rafael Sacks
BIM Processes
37
Collaborative BIM with an integrated model
Multi-disciplinary BIM with coordinated models
Lonely BIM with simulations
Lonely BIM for producing drawings
3D CAD
2D CAD
Manual drafting
The BIM Ladder
Gurevich, U., Sacks, R. and Shrestha, P., (2017). ‘Mapping the Impact of BIM Adoption Efforts on Occupant Value’, Building Research and Information, Vol. 49, No. 6, pp. 610-630.
© 2019 Rafael Sacks
Multi-disciplinary BIM with coordinated models
38
Sacks, R., Eastman, C. M., Lee, G., Teicholz, P., (2018). BIM Handbook: A Guide to Building Information Modeling for Owners, Designers, Engineers, Contractors and Facility Managers, 3rd Edition, John Wiley and Sons, Hoboken NJ, ISBN 978-1-119-28753-7
© 2019 Rafael Sacks 39
Pre-BIM
Design
Build Errors
Functional Failures
© 2019 Rafael Sacks 40
Basic BIM
Design
Model Check
Functional Failures
Build
© 2019 Rafael Sacks 41
BIM
Design
Model Check
Build
Simulate Evaluate
© 2019 Rafael Sacks
BIM ProcessVirtual Design, Virtual Construction and Digital Twin
42
1Model the building
2 Simulate the building
3Build the model
4Simulate the construction
5Build the building
6Measure the building, Monitor
the construction,Update the model
Virtual DesignVirtual Construction
Construction
Operation
8Operate & maintain the
building
7Update the model
© 2019 Rafael Sacks
20081st Edition
20112nd Edition
20183rd Edition
43
© 2019 Rafael Sacks
2009Korean1st Edition
2014Portuguese1st Edition
2016Italian1st Edition 2017
Chinese1st Edition
2014Korean2nd Edition
44
© 2019 Rafael Sacks
The Interactions between Lean and BIM
45
Sacks, R., Koskela, L., Dave, B. and Owen, R.L., (2010). ‘The Interaction of Lean and Building Information Modeling in Construction’, Journal of Construction Engineering and Management, Vol. 136 No. 9 pp. 968-980.
2 + 2 > 4 ?
© 2019 Rafael Sacks
Lean Principles
BIM Functionality
Reduce Variability
AGet quality right the first time
reduce product variabilityB
Collaboration in design and construction
9
10Multiuser viewing of merged or separate
multidisciplinemodels
2,13Clash checking
Collaborative multi-disciplinary review
Lean - BIM Interaction Matrix
2. Building modeling imposes a rigor on designers in that flaws or incompletely detailed parts are
easily observed or caught in clash checking or other automated checking. This improves design
quality, preventing designers from “making do” Koskela 2004a and reducing rework in the field as a
result of incomplete design.
Dehlin and Olofsson 2008; Eastman et al. 2008, p. 422
13. Multidisciplinary review of design and of fabrication detailing, including clash
checking, enables early identification of design issues.
Eastman et al. 2008, p. 362; Khanzode et al. 2008
46
© 2019 Rafael Sacks
Lean Principles
BIM Functionality Red
uce
Var
iab
ility
Red
uce
cyc
le t
imes
Red
uce
bat
ch s
izes
Incr
ease
fle
xib
ility
Sele
ct a
n a
pp
rop
riat
e p
rod
uct
ion
co
ntr
ol
app
roac
h
Stan
dar
diz
e
Inst
itu
te c
on
tin
uo
us
imp
rove
men
t
Use
vis
ual
m
anag
emen
t
Des
ign
th
e p
rod
uct
ion
sys
tem
fo
r fl
ow
an
d v
alu
e
Ensu
re
com
pre
hen
sive
re
qu
irem
ents
ca
ptu
reFo
cus
on
co
nce
pt
sele
ctio
n
Ensu
re r
equ
irem
ents
fl
ow
do
wn
Ver
ify
and
Val
idat
e
Go
an
d s
ee f
or
you
rsel
f
Dec
ide
by
con
sen
sus
con
sid
er a
ll o
pti
on
sC
ult
ivat
e an
ex
ten
ded
net
wo
rk o
f p
artn
ers
A B C D E F G H I J K L M N O P Q R S T U V W X
Visualization of form 1 1,2 3 4 11 5 6 4
Rapid generation and evaluation of multiple design alternatives
2 1 22 7 7 8
3 9 9 22 51 1 16 5
4 10 12 8 16 5
5 1,2 1 12 1 1 1 5
Maintenance of information and design model integrity
6 11 11 11
7 12 12 22 12
Automated generation of drawings and documents
8 11 22 (52) 53 54 54
Collaboration in design and construction
9 23 36 36
10 2,13 24 33 43 46 49
Rapid generation and evaluation of multiple construction plan alternatives
11 14 25 (29) 31 (41) 44
12 15 25 (29) 37 (41) 44 47
13 2 40 25 (29) 17 40 40 40 44 47 49
Online/electronic object-based communication
14 29 26 30 30 34 34 (42) 47 48
15 18 26 30 30 34 38 38 34 (42) 45 49
16 19 27 32
17 20 28 35 (42) 50
18 21 30 30 34 39 (42) 47 48
Lean - BIM Interaction Matrix
47
© 2019 Rafael Sacks
Building Lean,Building BIM
48
© 2019 Rafael Sacks
CONSTRUCTION TECHFROM RESEARCH TO STARTUP
49
© 2019 Rafael Sacks
TAMIRTechnion Autonomous Multi-purpose Interior Finishing Robot
50Interior Finishing Building Robot "TAMIR"Yehiel Rosenfeld, Abraham Warszawski, Uri ZajicekPages 345-354 (1991 Proceedings of the 8th ISARC, Stuttgart, Germany)
1993
© 2019 Rafael Sacks 51
2018
© 2019 Rafael Sacks 52
© 2019 Rafael Sacks
-10.00
0.00
10.00
20.00
30.00
40.00
50.00
60.00
HE
IGH
T,
m
0.0
1.0
2.0
3.0
16:4116:42
16:4316:44
16:4516:46
16:4716:48
16:4916:50
16:5116:52
16:53
TIME, hh:mm
WE
IGH
T,
t
ATTACH TRANSPORT EMPTYMOTION
ATTACH
LOAD DETACH
UNLOAD
CRANE OPERATION
Sacks, R., Navon, R., and Brodetskaia, I., (2006). ‘Interpretation of Automatically Monitored Equipment Data for Project Control’, Journal of Computing in Civil Engineering, Vol. 20 No. 2 pp. 111-120.
2006
53
© 2019 Rafael Sacks
CRANE
MONITORING
▪ 6 SECONDS INSTALLATION
PROCESS
▪ NON-INVASIVE DATA COLLECTION
▪ COMMUNICATION ON EXISTING
TOOLS
▪ Gathering sensor data in real time
▪ Extracting real world events
▪ Creating a digital representation of the process
2018
54
© 2019 Rafael Sacks
2018
55
© 2019 Rafael Sacks
2018
56
© 2019 Rafael Sacks
Lean and BIM Production ControlProposed 3D visualization of past, present and future work status for a trade
2008
Sacks, R., Treckmann, M., and Rozenfeld, O., (2009). ‘Visualization of Work Flow to Support Lean Construction’, Journal of Construction Engineering and Management, Vol. 135 No. 12 pp. 1307-1315.
57
© 2019 Rafael Sacks
KanBIM
Aim: To propose, define, develop and test a BIM-enabled system to support
production planning and day to day production control on construction sites.
Kanban(Pull flow control in lean production management)
+BIM
(Building Information Modeling)
=KanBIM
58
© 2019 Rafael Sacks
+
-
Main ducts –Ducts 20-31
Main ducts –Ducts 53-63
Main ducts –Ducts 33-42
Secondary ducts –Ducts 10a-20a
End Units –Zone 1
Testing HVAC -Zone 1
Sprinkler pipes Floor 3
Install main lines Basement 3 Fire fighting pump room
Pipe installation in drywalls West side basement 1
Install main lines Basement 2 Fire fighting pump room
Sprinkler pipes Floor 4
Main distribution board –Wiring Entrance floor Lobby
Support installation of hoist South side facade
Duct installation in drywalls West side Basement 1
Electrical connection HVAC end unit zone 1
Framing West side Basement 1
Side A West side Basement 1
Framing East side Basement 1
Framing for false ceiling Entrance floor Lobby
Side A East side Basement 1
Fix cracks West side basement 3 W12
Partitions Basement 1
Lintels and ring beams Basement 1
Complete to ceiling Basement 1
Partition walls Storerooms Basement 3
Close openings above HVAC Stairwell 2 Basement 1
Partitions Basement 2Lintels and ring
beams Basement 2
Complete to ceiling Basement 2
Erect HollowcoreFloor 5 Grids A1 to D4
Erect HollowcoreFloor 5 Grids A5 to D8
Prepare and pour topping Floor 5 Grids A1 to D8
Strip and clean Floor 5 Grids A1 to D8
Erect columns Floor 6 Grids E5 to H8
Erect columns Floor 6 Grids E1 to H4
Cut HVAC access holes Floor 4 Grid B3-C4
KanBIM Mock up2009
59
© 2019 Rafael Sacks
.NET custom user controls for displaying
objects of the Task class
KanBIM application,
.NET 4.0
Autodesk NavisWork COM viewer, .NET API 2011
Model Navigation
Controls
KanBIM Prototype2011
60
© 2019 Rafael Sacks 61
2018
© 2019 Rafael Sacks
Developing PracticeVisiLean
62
2018
© 2019 Rafael Sacks
Developing PracticeVisiLean
63
2018
© 2019 Rafael Sacks
Layout of interior works in building construction
• Time Consuming
• Error-prone
64
© 2019 Rafael Sacks
Layout of interior works in building construction
State-of-the-art solutions, 2016
o Manual marking and layout
o Robotic Total station
o Augmented reality – Hololens, Daqri, etc.
65
© 2019 Rafael Sacks
Hands-free solution
o Localization
o Calibration
o Projection
Degani, A., Li, W.B., Sacks, R. and Ma, L. (2019). ‘An Automated System for Projection of Interior Construction Layouts’ IEEE Transactions on Robotics and Automation, in press
Layout of interior works in building construction
2016
66
© 2019 Rafael Sacks
Lab experiments
Degani, A., Li, W.B., Sacks, R. and Ma, L. (2019). ‘An Automated System for Projection of Interior Construction Layouts’ IEEE Transactions on Robotics and Automation, in press
Layout of interior works2016
67
© 2019 Rafael Sacks 68
A device that accurately projects an augmented reality view of construction plans on the physicalenvironment – in one click
Deliver work product and process informationMonitor construction quality Report project progress status to stake-holders
2019
© 2019 Rafael Sacks 69
© 2019 Rafael Sacks
WHERE TO FROM HERE? CURRENT RESEARCH, FUTURE….
70
© 2019 Rafael Sacks
Developing Interest
o Google Scholar search for “Lean Construction” AND “BIM”
71
-
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 2017
An
nu
al n
um
be
r o
f ar
ticl
es
Year
Lean and BIM
Building Information Modeling
Lean Construction
© 2019 Rafael Sacks
Changing Concepts in Construction
72
Lean and BIM both change the way we think about
construction:
- As a production process with flow
- As a production process with virtual prototyping
- As an information intensive production process, with
two types of information: product and process
© 2019 Rafael Sacks
Challenges for Construction Tech
73
New challenges
o Modeling existing buildings or infrastructure for digital twins
o Integrating and interpreting product sensing data
o Integrating and interpreting process monitoring data
o Automated/optimized production flow control
Unsolved challenges
o BIM Interoperability
o Design automation, evaluation and optimization
o Automated code compliance checking
o Autonomous/robotic construction equipment
© 2019 Rafael Sacks
Challenges for Construction Tech
74
Automated code compliance checkingRule inferencing and machine learning for semantic enrichment and for checking compliance
Bloch, T., and Sacks, R. (2018). ‘Comparing Machine Learning and Rule-based Inferencing for Semantic Enrichment of BIM Models’, Automation in Construction, Vol. 91, pp. 256–272.
Model(IFC File)
Explicit Parameter(does not need enrichment)
Results
Building Code (clauses)
3Rule
Processing
4Machine Learning
Concepts (MVD)
1Rule
Processing
2Machine Learning
3Rule
Compilation
4Checking training
3Rule sets
4Trained
classifiers
Enriched Model
1Rule
Compilation
2Enrichment
training
1Rule sets
2Trained
classifiers
Enrichment training
data
Checking training
data
Model Checking Process
System Preparation Process
Semantic Enrichment Code Checking
© 2019 Rafael Sacks
The House of Construction Tech
75
Information Theory
Lean Production
Theory
Design Theory
Theory piles
Tech
no
logy
Bu
sin
ess
Pro
cess
Nee
d
Entr
epre
ne
urs
hip
Construction Tech columns
Ideas, Investment, ImplementationInnovationbeams
AdoptionAdoption roof
BIM Technology, Processes, PeopleBIM foundation
© 2019 Rafael Sacks
Thanks for your attention…….
76
Construction Tech: Innovation Founded on Lean Theory and BIM Technology
Rafael Sacks
Constructs: digital innovation in the built environment | 2018-19 Keynote Lecture Series
UCL, London, UKTuesday, 5th February, 2019