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Existing Building Information Models (eBIM) - Data Capture Techniques
Transcript of Existing Building Information Models (eBIM) - Data Capture Techniques
Range of Topographic, Measured Building Survey & Dimensional Control services for Infrastructure
Early adopters of 3D Laser Scanning
Experts in 3modelling
Small specialist team.
3D Laser Scanning | 3D Inspection | 3D Modeling | 3D Asset Management
Defining the project scope
3D LASER SCANNING
Asbuilt model accuracy:
Modelling timescales & delivery of results
Intended model use:
Intelligent filtering of point data
The point cloud as the model ?
Automatic Feature Recognition and extraction
planar surfaces / topo surfaces / pipes / windows doors etc.
Autodesk / Revit - Integration of Alice Labs point cloud engine?
Photogrammetry cheap quick data capture
Mobile Indoor Scanning - Matterport
20 times faster and 18 times cheaper than any other tool on the market
Co-ordinates System Arbitrary / Real World
Existing Topographic Survey
3D topo surfaces or 2D?
Internal / External / Voids / Roof
Revit Version ?
Point cloud Survey Accuracy
Individual points +/- 5mm
Control / Mean Error Report
Revit Model Accuracy
Dependent on scan quality / data voids
Limitations of Revit: out of plumb / undulating walls
Rule of thumb +/- 20mm
Worksets, copy / monitor & linked models
Ideally finished model as whole
Data capture is fast on site
However requires logical access to buildings
Vacant / Out of hours / soft stripped?
Bid / Visualisations
Renovation & extension
Dimensional control / Clash Detection
Off site fabrication
POINTCLOUDS IN REVIT
Importing and managing pointclouds
Index point cloud - conversion to the .pcg format
Insert as .pcg file (origin to origin)
Up to 50GB point clouds dependent on PC Spec
Cloud visual quality reduced no / intensity values
Acts like any other model element
Point clouds split up into clusters internal / external / by floor
Tip change screen from white to black!
Positioned on ordnance grid
Create Project north
LEVEL OF DETAIL
What to model?
Previously agreed level of detail
Design intent or as built condition
Accuracy +/- 20mm
Model vs Model lines (fine detail)
Building a usable model
BIM, NOT 3D SUVEY...
Delivering the model
Final check against scan data
Model cleaned (purge, audited etc)
Issue: Point Cloud, Webshare & Revit Model
CHILTERN HILLS ACADEMY
Timet Titanium Factory
UWE Bristol Conference Centre
Making life easier....
Appropriate access for survey
Sensible lead in times
Communicate model use to all parties
Level of detail
At the very least the Revit model needs to be developed enough to generate 1:100 / 1:50 scale survey plans, sections and elevations.
Internal partitions up to ceiling height
Internal / external walls / floors at visible level
Major internal wall features visible - boxings, openings etc.
Major external wall features visible - major signage, rainwater downpipes, soil vent
Sanitary fittings - indicative
Ceilings and bulk heads
Primary Structure extent of visible area - columns, beams and trusses
Visible secondary structure - columns, supporting curtain walling
Floor Slabs and level changes
Key MEP elements to be clarified on site
Internal roof structure where visible
External roof where accessible
1 day scanng = 5 days modelling
Titanium Metals Corporation (TIMET) is the world's largest fully integrated producer of high quality titanium metal products.
As part of ongoing investment in their Birmingham Plant they required a laser survey and asbuilt model. The survey was required to be carried out in a very small timeframe to avoid disruption to the plant.
Once the survey was completed a 3D asbuilt model was created to allow the engineers to virtually carry out design work and simulation of the installation of 2 new furnaces.
Made up of two storeys and covering over 10,000 sq m, the UWE conference centre is a vast building. Formerly the Hewlett Packard offices, the building has recently been acquired by the University of Bristol. Parsons Brinckerhoff the consultant engineers carrying out the refit of the building were looking for methods to survey the very complex ceiling void.
Located 4m above ground level and packed with piping and ducts conventional survey methods would have been impossible.
Academy survey required with fast turnaround.
350 scans carried out in 3 days
project split into clusters by block
2.5 weeks modeling
3 weeks from instruction to delivery
All identified external materials applied to system family's
Digital were asked to carryout 3d laser scanning and detailed modelling of the ornate facades on the old Seacroft hospital building in Leeds
Mobile | Hand held | Terrestrial | Air
• FLOOR LEVELS SET OUT - ALL LEVEL CHANGES
• ALL ELEMENTS BUILT WITH CORRECT ELEMENTS
• WALLS MODELLED WITH BASIC CONSTRUCTION
• COMPLEX SHAPES AS INPLACE MODELS / FAMILIES
• TOLERANCE +/- 20mm
• CORRECT PHASING - Existing
• ALL PARAMETRIC
WEBSHARE, INDIVIDUAL PHOTOGRAPHS, SITE RECONNAISSANCE, ETC. INTERROGATION OF THE POINTCLOUD DATA OTHER VIEWING SOFTWARE ALL USED TO ENSURE ACCURACY.
Typically 360 Degree Scans
Data voids identified
Lines of site
Any areas requiring traditional survey due to obstructions
Target less systems
3D acquisition even in complex, small, cluttered and hard-to-reach places.
Extent of survey & model
building material in system families etc
Not everyone works in 3D
Huge file sizes
Specialist software requirements
high spec machines
Why is point cloud data so underutilised?
Asbuilt BIM for Refurb
To form FM solution
22,000sqm over 6 floors.
SITE TIME: 12 DAYS
3D LASER SCANS: 650
HOURS MODELLING: 500hrs
LARGE SHOPPING MALL
LARGE SHOPPING MALL
LARGE SHOPPING MALL
SCAN TO BIM
“At its simplest level, BIM provides a common environment for all information defining a building, facility or asset together with its common parts and activities.
This includes building shape, design and construction time, costs, physical
performance, logistics and more.”
(RICS “What is BIM”)
WHAT IS BIM?
WHY BIM ?
BIM is the primary tool for the whole project team
It is a shared information model
Majority of UK projects are retrofit or refurbs
Desire to work in BIM on these projects
Traditional survey methods do not provide a cost effective method to carry out 3D BIM surveys
BIM software not designed for modeling existing buildings
UK Government Mandate 2016
Projects delivered faster, with greater accuracy, with less clashes rework and interference on site reducing overall project costs.
The benefits of BIM could lead to savings of 10 to 20% in CAPEX and 15 to 30% in OPEX
'fully collaborative 3D BIM as a minimum by 2016', and the need for efficiency and industry reform to realise a 'cost reduction of 20% during the term of the current parliament'
Its only for large projects (£20million +)
Its a piece of software
It takes years to get up to speed
Its only for new builds
BIM is more expensive
Its only for buildings
Existing Building Information
We convert existing buildings / structures to accurate Revit models
Specialise in As-Built Revit Models for retrofit & refurb projects using the latest 3D laser scanning data capture techniques
Existing Building Information Modelling (eBIM) is the first step in the BIM workflow for clients who are looking to work with existing buildings.
Staff: Architects, Surveyors, Technologists
eBIM - Existing Building Information Modelling