updated on 29 May 2016

Transcription

1 updated on 29 May 2016 BIM IFC4 QTO, a practitioner s perspective SEAH Kwee Yong FSISV MRICS, buildingsmart Singapore JACIC s seminar 5 Jul 2016 At the Grand Arc Hanzomon, Tokyo

2 Last Visited Tokyo in 2003 (SARS) Quantity Take Off (QTO) Basic QTO (from IFC) Calibrated Quantities/ Customised Quantities Schedule of Rates (SOR) JACIC 2

3 SEAH Kwee Yong, Chartered Surveyor/ Cost Engineer FSISV, ICECa, MRICS, MSc Property & Maintenance Management (NUS), BSc Building (NUS ), Building and Construction Industry IT Standards Technical Committee (BCITC) Singapore Measure Work Group, buildingsmart Singapore (bss)/ Singapore Institute of Surveyors and Valuers (SISV) International BIM Work Group, Royal Institution of Chartered Surveyors (RICS) BIM Manager/ Project Manager, Cyril K H Seah Architects Langdon & Seah (Retired 2013) Land Transport Authority Singapore (Retired 2008) Singapore Standard CP97 Code of Practice for Construction Electronic Measurement Standard (CEMS): o SMM for Building Works (part 1) and o SMM for Mechanical and Electrical Works (part 2). Singapore Standard SS 527 Code of Practice for Building Project Document Control System bss Technical Guide on BIM Object Library and Collaboration Academic & Research Award for: Excellence in International Quantity Surveying and Cost Engineering, by the Pacific Association of Quantity Surveyors (PAQS) 2007 JACIC 3

4 History of IFC (open copyright) Begin as Industry Alliance for Interoperability 1997 International Alliance for Interoperability (IAI) 1997 IAI Singapore Chapter started 2003 IFC2x2 launched (current standard IFC2x3) 2006 Revit IFC Export certified Challenging AEC on o o o Open BIM, with BIM Execution Plan (BEP), for Integrated Project Delivery (IPD) through vendors Navigator 2009 IAI rebranded as buildingsmart International (bsi) 2013 IFC4 yet to have vendors certified; Normative Reference: ISO 10303, Industrial automation systems and integration????...for full implementation Implementation Phases suggested in country deadline Progressively working towards is termed BIM Maturity index AIA E202 Document BIM Element Table to monitor project progress JACIC 4

5 JACIC Integrated Project Delivery (IPD) 5

6 Typical Expectation on BIM Manager JACIC 6

7 IFC Export E.g. Revit can export Data on IFC format. An IFC certified vendor would be able to support IFC (based on IFC2x2 to IFC2x3 currently). This export is not 100%, but for the basic essentials only. Properties of Basic QTO is one of them. Data beyond the basic, for example used by backend Analyser software to supplement Revit is not. Thus, it comprises the Foundation Layer only. Namely the basic 3D. JACIC 7

8 Basic QTO vs Add on calibrated Quantities IFC has a component on QTO, defining the parameters to be snapped on. During IFC2x2, it had not been fully developed nor in consensus. IFC4 (known as IFC2x4 then) had re-designed the Relational Database, with QTO vendors and users. Basic QTO items would be expanded when vendors are certified for IFC4 compliance. IDM for whole new set of basic QTO is in progress; but only for the common ones. So localised items are not and has to be customised. JACIC 8

9 JACIC 9

10 capable of QTO JACIC 10

11 Ad hoc or add on calibrated measurement Add formula as extension to basic QTO. Converting the basic quantity with one or more dimension. e.g. Weight converter Some formula suggested in IDM are too complicated. Some are for staging or range or intervals constraints, such as ceiling/ soffit height"; "excavation interval". A way to overcome is to simplify the measuring rule of the Standard Method of Measurement (SMM). In Singapore, this simplification is done by SS CP97 CEMS - SMM. JACIC 11

12 Can QTO stagetransformation linked? Can past quantities be reused?: o o o o From i. Space; To ii. Element?; To iii. Composite as item?; To iv. BQ SMM items? Basic QTO for each stage? + customised Take Off? Take off process has to be repeated for each stage? JACIC 12

13 IFC4 JACIC 13

14 Height; EavesHeight, FootprintArea, GrossFloorArea, NetFloorArea, GrossVolume, NetVolume GrossHeight, NetHeight, GrossPerimeter, GrossFloorArea, NetFloorArea, GrossVolume, NetVolume GrossPerimeter, GrossArea JACIC Height, FinishCeilingHeight, FinishFloorHeight, GrossPerimeter, NetPerimeter, GrossFloorArea, NetFloorArea, GrossWallArea, NetWallArea, GrossCeilingArea, NetCeilingArea, GrossVolume, NetVolume 14

15 JACIC 15

16 From Revit Guide Export a Project to IFC Save a project as an IFC file for use with an IFC-certified application that does not use the RVT file format. JACIC 16

17 Estimate With just Basic QTO JACIC 17

18 Revit Export.dwf for 5D BIM CostX Estimate JACIC 18

19 CostX picking Revit s.dwf by Object JACIC 19

20 Naviswork quantitieschoose JACIC 20

21 JACIC 21

22 JACIC 22

23 Other practice initiatives RICS New rules of measurement for building works (NRM) o o o o o NRM 1 - Order of cost estimating and cost planning for building works. Elements, systems, sub systems and components. NRM 2 Detailed rules for measurement and description of building works. Trade based classification system NRM 3 Order of cost estimating and cost planning for building maintenance works. Extension of NRM &fileid=6531 COBie (BS :2014) Collaborative production of information Part 4: Fulfilling employer s information exchange 4D, 5D integration From objects Properties (IFC QTO) Formula calibrated-quantities JACIC 23

24 Hurdles Need to synchronise meaning of terms e.g. GFA o o Gross Floor Area (usage x) is not the same as GFA (usage Y) and is affecting input to Assets Information Model RICS introduces International Property Measurement Standards (IPMS) to address and understand the country differences in the definition of GFA (usages) Need to synchronise Digital Building Block o o A structured common Library of BIM Object for commonly used items in a shared context e.g. Country Based; and therefore a possible Object related Cost Library An associated customised QTO (i.e. formula extension) can be developed for reused or lookup as reference. (e.g. plug in in HELIOS) JACIC 24

25 JACIC 25

26 JACIC 26

27 BIM Maturity; Index? JACIC 27

28 How much can practitioner influence? CAD Vendor + Intermediate 5D Vendor + Practitioner Object library detail + Cost library detail link e.g. Architectural Objects, Structural Objects, MEP Services Objects JACIC 28

29 Thank You JACIC 29

30 JACIC 30

31 JACIC 31

32 JACIC 32

33 JACIC 33