View
7
Download
1
Category
Preview:
Citation preview
11/28/2012
1
"BIM Object Libraries and their
implications in the preparation of BQ
and estimating"
Eugene Seah
Deputy Chairman
Langdon & Seah Singapore
Assistant Professor (Adjunct), National University of Singapore
eugeneseah@sg.langdonseah.com
Two Papers
Seminar on
"Future-proofing
Quantity Surveying
- Meeting the BIM
Challenge Head-
on," 26 & 27
November 2012,
Kuala Lumpur
11/28/2012
2
BIM
Training
Deployment
In Co.
Legislation
Incentives
Interstate
www
Cloud
Clear
brief
Vendors’
services
Integrated
Definition
Vendors’
support
Project
Documentation
Client’s
Documentation
BIM
contents
Standard CP
/Framework
Open library
/cloud base
Sustainability
Technology
Climatic Change
Social & Recreation
Demographic Change
Globalisation
BEP
BIM
Training
Deployment
In Co.
Legislation
Incentives
Interstate
www
Cloud
Clear
brief
Vendors’
services
Integrated
Definition
Vendors’
support
Project
Documentation
Client’s
Documentation
BIM
contents
Standard CP
/Framework
Open library
/cloud base
BIP
BDP
R&D
BMM
Sustainability
Technology
Climatic Change
Social & Recreation
Demographic Change
Globalisation
11/28/2012
3
Analysis BEP
BIM
Training
Deployment
In Co.
Legislation
Incentives
Interstate
www
Cloud
Clear
brief
Vendors’
services
Integrated
Definition
Vendors’
support
Project
Documentation
Client’s
Documentation
BIM
contents
Standard CP
/Framework
Open library
/cloud base
Program
Simulation
Asset
Schedule
Cost
Software
BIP
BDP
R&D
BMM
Sustainability
Technology
Climatic Change
Social & Recreation
Demographic Change
Globalisation
Analysis BEP
BIM
Environment Social
Training
Deployment
In Co.
Legislation
Incentives
Interstate
www
Cloud
Clear
brief
Vendors’
services
Integrated
Definition
Vendors’
support
Project
Documentation
Client’s
Documentation
BIM
contents
Standard CP
/Framework
Open library
/cloud base
Business
Program
Simulation
Asset
Schedule
Cost
Software
BIP
BDP
R&D
BMM
Sustainability
Technology
Climatic Change
Social & Recreation
Demographic Change
Globalisation
11/28/2012
4
Analysis BEP
BIM
Environment Social
Training
Deployment
In Co.
Legislation
Incentives
Interstate
www
Cloud
Clear
brief
Vendors’
services
Integrated
Definition
Vendors’
support
Project
Documentation
Client’s
Documentation
BIM
contents
Standard CP
/Framework
Open library
/cloud base
Business
Program
Simulation
Asset
Schedule
Cost
Software
BIP
BDP
R&D
BMM
Sustainability
Technology
Climatic Change
Social & Recreation
Demographic Change
Globalisation
Global Construction Consultants
8 8
Outline - Object
What is Object (GUI + Database)
Shape provided by Vendors
Revit, Bentley, Graphisoft, Vectorworks, etc
Object Library Structure
Neutral Exchange IFC
Language IFD
Mapping IDM
FM COBie
buildingSMART QTO
US Omniclass,
Uniformat, Masterformat
Country Customisation
UK BCIS,
Rule of Measurement
Singapore
SS CP80, 97 and 93
Object-Linkable Quantities,
Calibrated add on;
4D Schedule
/5D Costing
Variations?
As built Final Account
• What
• How
• Issues
11/28/2012
5
Global Construction Consultants
9
Global Construction Consultants
10 10
Neutral database structure:
Industry Foundation Classes (IFC)
• http://www.buildingsmart-
tech.org/ifc/IFC2x4/rc4/html/index.htm
• Basic QTO were already coordinated.
11/28/2012
6
Global Construction Consultants
11
Source: NBS UK
Global Construction Consultants
12
Source: NBS UK
11/28/2012
7
Global Construction Consultants
13
Global Construction Consultants
14
11/28/2012
8
Global Construction Consultants
15 15
IDM for country based QTO
Country Based
Global Construction Consultants
16
Attributes needed in stages
LOD100 LOD200 LOD300 LOD400 LOD500
Country Based
Country Based
11/28/2012
9
Global Construction Consultants
17
5D Budget Mgt Users
5D Cost Mgt Users
4D Time Mgt Users
6D FM User
Other support Analyses
Green Analysis
Functional Needs
4D Constructability
Buidability
Change Mgt
Attributes-Responsibility Matrix to Integrate BIM
LOD200
LOD100
LOD400
LOD300
LOD500
Global Construction Consultants
18
Associate Classification to
Singapore Standard CP97 CEMS ID
18
MEASUREMENT ITEMS
Information on Drawing Quality /General Conditions CLASSFICATION TABLE
MEASUREMENT RULES (IFC)
DEFINITION RULES
COVERAGE RULES
SUPPLEMENT RULES
Col.1 Col. 2 Col.3 Col.4 Unit /Description for Unit
Measurement
IFC measurement resource layers for e-measurement
Define sizes are nominal or effective
Items deemed included
Items linked to NPQS & other electronic info
exchange
Classification (CRCS /description)
Quality of material to Singapore Standards (SS)
Document Layer
Document Layer
Cost Treatments & Testing
Measure (m2, m3) Jointing & Fixing
Material Limits
Link to web based NPQS
Work Section
number Sub Heading
number Number from
column 1 Number from
column 2 Number from
column 3 Number from
column 4
e.g. 04000000: 0: 2. 2. 1. 1
Excavation Works - Excavation /Filling works
Foundation excavation
Pits for pile-caps, column or stanchion bases and the like
Commencing level stated
e.g. 20000000: 1: 1. 4. 1. 2
Ventilation, exhaust and air conditioning installation
Ventilation /Fume extract
Ventilation Dampers Type and size stated
Fire dampers
An asterisk within a cross reference represents all entries in the column in which it appears.
The digit 0 within a cross reference represents no entries in the column in which it appears.
CEMS cross reference ID:
e.g.
04000000: 0: 2. 2. 1. 1
21000000: 1: 1. 4. 1. 2
11/28/2012
10
Global Construction Consultants
19
Develop plug-in Drivers: IDMs
19
Global Construction Consultants
20
Detailed Wall Types QTO
These are generic wall types
that have had the correct
Uniformat information
applied to them.
You can certainly use other
wall types, but these will
give you guidance about
what information is key to
this process.
11/28/2012
11
Global Construction Consultants
21
1
2
3
Global Construction Consultants
22 Similar minimum benchmarks on usability, functions, graphical user interface and data structure
2 or 3D
drawings
Layering console
Measurement Data manipulation
Exportable to a database/ Excel/ Access
11/28/2012
12
Global Construction Consultants
23
Package Assembler
1. Repackage the items to
suite the contractor’s
procurement style and
methods
2. Direct extraction from
the e-BQ, repackaged,
and sent directly to the
marketplace for RFQ
3. No need to fax
specifications, send
drawings etc
03000
03000
03000
03000
Global Construction Consultants
24
03000
03000
11/28/2012
13
Global Construction Consultants
25
1
2
3
4 5
Global Construction Consultants
26
Conceptual Quantity Takeoff with BIM- HOK/ LS Study
Currently, construction project facing following
challenges –
•Advance groundbreaking
•Compressed construction schedule
•Raw materials escalation
•Accurate forecast of construction cost
HOK generates conceptual quantity takeoff
information from the BIM model that can be
used to formulate a conceptual cost estimate.
The techniques and methods have been
developed in junction with the HOK
Construction Services Group.
11/28/2012
14
Global Construction Consultants
27
What is included in a conceptual estimate
To begin to construct a conceptual estimate
you must have a firm understanding of how it
is produced.
Because in this phase of a project the
variables are so great a small amount of
information is used to generate a large variety
of cost information.
•Functional Floor Area
•Building Skin Area
•Interior Wall Length (if applicable)
•Ratio of Solid vs Glass
•Ratio of External Wall to Construction
Floor area
•Construction Floor Area showing PES,
NFA and even efficiencies
Global Construction Consultants
28
BIM building masses
Revit masses are very useful when a design is
in its very first stage of development. It
allows you to quickly create the building
form, and then easily count the quantity
information that has been generated from
the form.
This process also works with a mass imported
into a family from Rhino or other applications
that produce solid geometry.
Designer can balance between form seeking
& technical requirement, i.e. floor area.
What is
my total
floor
area?
11/28/2012
15
Global Construction Consultants
29
Taking Off Template
Revit gives us a number of ways to
count information about your design.
The key is to understand what
method is the most useful and
accurate for the stage of your project.
Several conceptual design quantity
takeoff (QTO) schedules are set up
for easy setup by design team.
These templates are to be discussed
with the Quantity Surveyor to
separate cost attributes into:
•Functional Areas
•Trades
•Elements
•Cost Centre (eg office tower,
residential tower etc)
Used when multiple
buildings are in project
Surface area is
calculated based on
each mass floor
Mass Floor Area
Global Construction Consultants
30
B2010 – Surface Area
This value is calculated by the mass floors for
each level of the building. It is essentially
the surface area from one Mass Floor to the
one above.
This information is very useful regarding
conceptual QTO. However, this critical data
can be difficult to quantify with today's
creative architecture. BIM made these
available to both designer and cost
estimator with constant update as building
mass evolves.
11/28/2012
16
Global Construction Consultants
31
BIM wall by face
A twist on the Mass Floor only takeoff method
is one that uses the Wall by Face tool in
conjunction with the Mass Floors. This allows
you a higher level of control and allows you
to specify different construction types for the
different vertical surfaces in the project.
QTO-Exterior
QTO-Curtain Wall 2
QTO-Exterior - Below
QTO-Curtain Wall
Global Construction Consultants
32
Mass it, Test it, & Evaluate it
OPT1
*Surface Area include the Roof Surface
OPT 2 OPT3
11/28/2012
17
Global Construction Consultants
33
Mass it, Test it, & Evaluate it
OPT 3 OPT 2
OPT 1
Global Construction Consultants
34
11/28/2012
18
Global Construction Consultants
35
Global Construction Consultants
36
11/28/2012
19
Global Construction Consultants
37
Global Construction Consultants
38
11/28/2012
20
Global Construction Consultants
39
Global Construction Consultants
40
11/28/2012
21
Global Construction Consultants
41
Global Construction Consultants
42
11/28/2012
22
Global Construction Consultants
43
Global Construction Consultants
44
11/28/2012
23
Global Construction Consultants
45
Global Construction Consultants
46
11/28/2012
24
Global Construction Consultants
47
Global Construction Consultants
48
11/28/2012
25
Global Construction Consultants
49
Global Construction Consultants
50
11/28/2012
26
Global Construction Consultants
51
Global Construction Consultants
52
11/28/2012
27
Global Construction Consultants
53
Global Construction Consultants
54
11/28/2012
28
Global Construction Consultants
55
Global Construction Consultants
56
11/28/2012
29
Global Construction Consultants
57
Global Construction Consultants
58
11/28/2012
30
Global Construction Consultants
59
Global Construction Consultants
60
11/28/2012
31
Global Construction Consultants
61
Global Construction Consultants
62
11/28/2012
32
Global Construction Consultants
63
Global Construction Consultants
64
11/28/2012
33
Global Construction Consultants
65
Global Construction Consultants
66
11/28/2012
34
Global Construction Consultants
67
Global Construction Consultants
68
11/28/2012
35
Global Construction Consultants
69
Global Construction Consultants
70
11/28/2012
36
Global Construction Consultants
71
Global Construction Consultants
72
11/28/2012
37
Global Construction Consultants
73
Global Construction Consultants
74
11/28/2012
38
Global Construction Consultants
75
Global Construction Consultants
76
11/28/2012
39
Global Construction Consultants
77
Specification No Resource Information Cost Product Code
Global Construction Consultants
78
11/28/2012
40
Global Construction Consultants
79
Global Construction Consultants
80
11/28/2012
41
Global Construction Consultants
81
Global Construction Consultants
82
$360,879.00
11/28/2012
42
Global Construction Consultants
83
Conclusions
• Establish IDM and Standards
• Agree on an open architecture
• Agree on function and use of the model
• Agree on information and attributes
Agree on a shared Database
• Complimented by agreed BIM processes
Global Construction Consultants
84
Thank You
(Q & A) Eugene Seah
Deputy Chairman
Langdon & Seah Singapore
Assistant Professor (Adjunct), National University of Singapore
eugeneseah@sg.langdonseah.com
Recommended