BIM in the real world - Keith Snook
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BIM in the real world
Keith Snook
Part of the BRE TrustBIM – Acronyms, don’t you just love them?
Give us a B
Building – So long as it is the Verb
Give us an I
Information – It is all about the information/data
Give us an M
Modelling – I suppose …. but has come to imply
too much emphasis on graphics
Give us another M
Management – Definitely about thatBIM in the real world
The real world
Part of the BRE TrustWhat goes wrong with buildings - causes
LACK OF SKILL
LACK OF CARE
LACK OF KNOWLEGE
POOR PLANNING BY TRADESPERSON
CONTRACTOR’S ORGANISATION PROBLEM
LACK OF PROTECTION OF COMPLETED WORK
LACK OF DESIGN COORDINATION
DIFFICULT TO BUILD
DESIGN WILL NOT WORK
UNCLEAR/MISSING PROJECT INFORMATION
LOW QUALITY DESIGN
DESIGNER NOT UNDERSTANDING MATERIALS
OtherBIM in the real world
The real world
Then and Now
Part of the BRE TrustBackground
Edwin Lutyens about 100 years ago
– “A working drawing is a letter to a builder telling precisely
what to build; not a picture to charm the client”
Various studies and reports:
– Banwell – 1966
– BRE – 1970s & 1980s
– CPI Codes – 1986, 2003, 2010.
– Latham – 1995
– Egan – 1998
– Avanti – 2000 – 2005
(which led to BS1192 - 2007)Production Information – Then or Now?
Is:-
– Lutyens again “A working drawing is a letter to a
builder telling precisely what to build; not a picture to
charm the client”
– Information providing the instructions about what to
construct
– Typically comprising
- specifications
- drawings
- measured quantities
All calling on
- information/data
LOTS OF IT!!Specification What is it first? 1 A verb - the act of specifying starts at the first whiff of a commission. The earliest ideas that predicate design decisions imply a specification, however vague, of that design. Even a sketch on a table cloth starts to imply specification.
National Building Specification – NBS. Use this to illustrate scale
These days it actually looks like this:
and is (getting closer to being) BIM compatibleDrawings – in the real world
Drawings were produced by real
people
– Drawn on tracing paper by real
draughtspeople, at real drawing
boards
– Using real scale-rules, parallel motions & pens
– With copy-negatives, ink-blots and razor blades
– Drawn to real office standards
– Issued formally, through the post
And….
– Assumed to be incorrect – because they were manually
created!!!!
CREATIVE PESSIMISMDrawings – in the real world
Drawings are now produced using
computers
– Drawn by CAD/BIM technicians
– Using the fastest computers they can find
– With the most aggressively marketed
software available
– To their own individual standards 18
– E-mailed without any form of control 18
And…
– Assumed to be correct – because they
are computer generated!!!!
NAIVE OPTIMISM ‘Spinal Tap’ stage set“To really screw things – use a computer”
……… without proper controls!Without processes it ‘will’ go wrong –
even with BIM
Clash
detection?
Clash
avoidance/
eliminationBIM
Let’s get the graphics bit out of the way
Model space
It relies on
Origin and Orientation Object space
• Cartesian co-ordinates are the
basis of CAD/BIM systems
• This allows accurate control of the
location, size and dimensional
quality of the output
Scale 18ft
• Full size 18
Project
18
space
Data
18ft
• All relevant properties – sometimes
called 4D, 5D, 6D > nD
DATA!CPIC/Avanti becomes BS 1192:2007
From CAD to BIM to iBIM Part of the BRE Trust
From CAD to iBIM - Effects and Gains
Create Project Information (‘level 2’)
Shared and Extract Views/Data
Validated Models
Architect
Integrated Model Files
(might be one file but
Structural more likely just look like
and Civil one file)
MEP
Create Drawings
Schedules etcThe Common Data Environment – the real world will require collaboration
Data Centric – Need to keep control of data
Data Arch Grid
Struct
Data Column
WIP
Data
M&E
WIP
WIP M&E
Arch trn
D ra
ct
Swi ug
PDF
DrgM. &E F
Shared Struc
Architectt
W
or D
Non Graphical Data
Schedules and
Bills of Materials etc.
Document &
Asset Cost Data
RegisterNavis
(Artra)
Management
Procure
Design
Construction
Sequence ReviewBIM in the industry Part of the BRE Trust
2012 NBS BIM Survey “If it says ‘BIM’ on the software box I must be doing BIM ………. And I’m using it to spin my graphics like Dr Who’s Tardis” Doing BIM? – I don’t think so
Data formats and real world programme
Documentation and guidance The world certainly feels real for those of us trying to produce these
Project and Data Management
The real world doesn’t need all the detail up front Key to Colour Coding
Core CAD Process
CAD Standards Guidance & support ref asset coding methods & tools Common Compliance CAD Standards
File Naming
Layer Naming Model file sharing Model files contain Handover Key Procedures
Blocks & Objects Spatial virtual construction Documentation/Models
Level of Detail coordination objects fully populated checked Other References
Clash Checking Create & Align Asset and approved
Data
Concept Design Production As Built Handover
Common Standard
Design & Model Geographic Data Maintenance for Asset Coding &
Maintenance
Management Define Units for a Integration Integration Naming Manage
Object Libraries Location
Define Content
Data Delivery Format Check Data Content Specify roles and Asset
responsibilities for
delivery
Required Production Data
Why? Why? Why? Why? Why?
Comply
Creates a unified data set Enables co-ordination & data Major benefits from unified Minimal work necessary if Mandatory CLRL requirement.
across programme from the sharing between teams - CDE data structures e.g. schedules preceding work compliant - Data used for maintenance &
start. principles maintained. & maintenance integration. just the as-built changes. future development projects.
Comply
Need to re-create full data set Teams not able to co-ordinate Varying formats severely limit Potentially major corrective Non-compliant data will be
Don't
when moving into design. design data - CDE principles usefulness of data to the task where preceding work is rejected by CLRL e.g. files fail
compromised. programme. non-compliant. CAD checking compliance
Example
Library object schematic symbol Design object model Purchased Object data fields As-built changes incorporated & Object included in handover data
used in concept GA - simple plan development. 3D view for spatial completed progressively. data set updated as necessary set with corresponding population
view. fit. Schedules & take-offs. Schedules & take-offs. of CLRL BIM
As built
Data Sheets
Schedules and
commissioning
data and reports.
Procurement
Library object schematic symbol Design object model Maintenance Maintenance and performance
specification and
used in concept with design development. Design parameters information records continually updated
product selection
specification and performance. for product selection added. during lifecycle.
and cost.Government client data drops exchanges
Ministry of Justice: Strategy and data exchange specification
And what about the real world after 2016?
All I can say is we are working on it
Watch this space …………
And start reading stuff on the ‘semantic web’ and
‘linked data’.Helping to get BIM
Rocking in the in the real world sic
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