bim at lsh · • revit ifc import / export a bit flaky but improving-ifc import placed elements in...
TRANSCRIPT
BIM at LSHWhy we use Revit software
Pressures for change
•Concerns about poor quality and coordination of drawings using AutoCAD
•Experience of staff using BIM software elsewhere
(Currently no client require BIM)
Staff Preference
•BIM is more fun
- staff who have learnt Revit don’t want to go back to 2D CAD
It works
•Potentially more efficient than 2D CAD
•Better visualisations
•Clients love 3D
•Better construction documentation
•Better coordination on site
BIM at LSHFirst projects in Revit - 2008
Slingfield Mill Kidderminster
First Revit project on site
•An extension to an existing building
- not an ideal for beginners
•A lot of 2D drafting
-existing elevations etc.
Substation Kidderminster
First proper 3D BIM project
£30K
•A small start
Pioneer Square Bicester£38M - First large project using Revit
Pioneer Square Bicester£38M - First large project using Revit
cinema
Sainsbury's
shops
shops
bus interchange
car park
Pioneer Square Bicester£38M - First large project using Revit
Pioneer Square BicesterSainsbury’s fit-out
Pioneer Square BicesterSainsbury’s fit-out
•No BIM requirement from client (though Sainsbury’s now beginning to implement Revit)
•Local Authority Development competition
•Submitted for planning in 2007
•Redesigned in 2009 to suit downturn in property market
•LSH the only consultants using BIM
•Single stage D&B procurement
•Was it BIM, little BIM, lonely BIM or what?
- well it was building information modelling
- schedules produced from model
- specifications linked to model
- model exchange with steelwork fabricator and other metalwork subcontarctors
Pioneer Square BicesterFirst large project using Revit
Model split into 3 buildings/zones + site plan
Pioneer Square BicesterProject organisation
Cinema & Retail
Sainsbury’s store
Ancillary buildings
Site
Modelling in 3DOver 300 drawings produced from 4 files
DocumentationOver 300 drawings and schedules produced from 4 files
Communicating Ideas3D modelling used to develop and communicate ramp circulation
Coordination and Collaboration ackagesAn attempt to use a CAD/BIM Protocol
CAD/BIM Protocol issued by LSH for consultant team to follow
•File naming
•Coordinate system
•Exchange of source files (2D & 3D model data) – not annotated drawings
CAD/BIM Protocol not followed by consultant team
•Fellow consultants could not grasp the concept
•Still sent bound DWGs which include other parties’ information
Subcontractors ?
•A few worked in 3D BIM (Tekla)
•Some issued standard details ignoring our information – lifts and travelators
•Some started with a blank CAD file re-drew our information and made mistakes
Coordination and collaborationWhy can’t we learn to collaborate better
CPIC Production information: a code of procedure for the construction industry
Published in 2003
‘Necessary changes to the management of the design process have not
been made; in consequence CAD systems are not being used to their full
potential, invariably being used as little more than electronic drawing
boards...
At present most production drawings are produced using conventional 2D
CAD systems, but despite this the inadequacies of the manual method
remain..’
Coordination and collaborationWhy can’t we learn to collaborate better
New guidance – hope for the future?
Guide to
BS 1192
PAS 1192-2
CPIC
BIM Execution Plan
+
Assessment forms
CICBSI
BIM Protocol
+
Appendices
Information
manager role
Coordination with subcontractor packagesLSH design - Travelators in scissor arrangement with central supports
Coordination with subcontractor packagesLSH design - Travelators in scissor arrangement with central supports
1 support position
per level
Coordination with subcontractor packagesSubcontractor’s drawings – no context & supports do not work with scissor arrangement!
4 support positions
per level
Construction stage IFC ExchangeBIM models exchanged with key subcontractors for design development and coordination
issued model
model issue sheet
Construction stage IFC ExchangeIFC exchange assisted coordination of steelwork package
steelwork model
model coordination review
architectural model
Construction stage IFC ExchangeIFC exchange assisted coordination of steelwork package
IFC Free viewers used by team members – but not the contractor!
Construction stage IFC Exchange
Issues
• Revit IFC import / export a bit flaky but improving
- IFC import placed elements in wrong categories
• No control over Coordinate system for export
-Shared / world coordinate system exported, whereas Steelwork fabricator used local coordinate system
• No exporting of grids etc.
• Smaller subcontractor packages – couldn’t export cutaway sections of the model so subcontractors
didn’t use our model
• Some subcontractor models based on site surveys, so there was a tolerance issue importing them
back into our model
Using BIM Software
What we learnt
• IFC exchange works
• BIM does not replace the need for good communication between team members
- Telephone calls and emailed screenshots play a vital role in coordination alongside regular
model exchange
• Regular exchange of work-in-progress models very important
- design is an iterative process
• The model is the key reference – fudges are counterproductive
- We ended up modelling a lot of the substructure and doing some of the structural engineers’ work
- Draw details on top of the model – don’t hide the model
Design Development – use of BIMRevit used from Planning through to completion – improved visualisation
1. View of structure within REVIT
model2. Wireframe view within REVIT model
3. Exported colour view from REVIT
4. CGI marketing render
5. Photograph of completed scheme
Revit – to 3D Studio MaxCustomer Journey Animation from BIM model
Revit – to 3D Studio MaxCustomer Journey Animation from Revit model
CompletionPromotional video