Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Existing Building Information Models (eBIM) - Data Capture Techniques

Creating asbuilt BIMs of existing buildings and Infrastructure in Revit
by

Ben Bennett

on 14 November 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Existing Building Information Models (eBIM) - Data Capture Techniques

COMPANY BACKGROUND
DIGITAL SURVEYS
eBIM SURVEYS
Project Planning
Data Capture
Revit Modelling
Range of Topographic, Measured Building Survey & Dimensional Control services for Infrastructure

Early adopters of 3D Laser Scanning

Experts in 3modelling

Small specialist team.

CORE SERVICES:
3D Laser Scanning | 3D Inspection | 3D Modeling | 3D Asset Management
PROJECT
PLANNING
Defining the project scope
3D LASER SCANNING
DATA CAPTURE
PROJECT
ACCURACY
Asbuilt model accuracy:
PROJECT
DELIVERY
Modelling timescales & delivery of results
PROJECT
PLANNING
Intended model use:
NEW TECH
DATA CAPTURE
Intelligent filtering of point data
The point cloud as the model ?

DATA PROCESSING
Automatic Feature Recognition and extraction
planar surfaces / topo surfaces / pipes / windows doors etc.
Autodesk / Revit - Integration of Alice Labs point cloud engine?

ALTERNATIVE TECHNOLOGIES:
Photogrammetry cheap quick data capture
Mobile Indoor Scanning - Matterport
20 times faster and 18 times cheaper than any other tool on the market
PROJECT
CASE STUDIES


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
Registration error
Control / Mean Error Report

Revit Model Accuracy
Dependent on scan quality / data voids
Modelers Interpretation
Limitations of Revit: out of plumb / undulating walls
Rule of thumb +/- 20mm
Phased Delivery
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
Facilities Management
Energy Analysis
MANAGING
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
REQUIRED
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)
Common sense
PROJECT
STANDARDS
Building a usable model
SYSTEM FAMILIES

NAMING CONVENTIONS

WORKSETS

BIM, NOT 3D SUVEY...
RESULTS
DELIVERABLES
Delivering the model
Final check against scan data
Phased delivery
Model cleaned (purge, audited etc)
Issue: Point Cloud, Webshare & Revit Model
CHILTERN HILLS ACADEMY
PROJECT
CASE STUDIES
Timet Titanium Factory
PROJECT
CASE STUDIES
UWE Bristol Conference Centre
ASBUILT
MODELS
Making life easier....
Appropriate access for survey
Detailed brief
Sensible lead in times
Communicate model use to all parties
Expectation management
Intended Use
Level of detail
Accuracy
Assumptions
Timescales
Delivery
Budget
STANDARD
MODEL SPECIFICATION
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
Stairs
Windows, doors
Ceilings and bulk heads
Railings, balustrade
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
PROJECT
SCOPE
Asbuilt Model
Pointcloud
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.
Animation
Pointcloud
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
9000sq m
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
PROJECT
CASE STUDIES
Seacroft Hospital
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.
MODEL
CONSTRUCTION
Typically 360 Degree Scans
Data voids identified
Lines of site
Any areas requiring traditional survey due to obstructions
TERRESTRIAL
SCANNING
CONTROL
NETWORK
HANDHELD
SCANNING
Target less systems
Self positioning
Structured Light
3D acquisition even in complex, small, cluttered and hard-to-reach places.
RESULTS
POINTCLOUDS
Extent of survey & model
Pointcloud
building material in system families etc
SCANNING
PROCESS
POINTCLOUDS
Not everyone works in 3D
Legacy systems
Huge file sizes
Specialist software requirements
plug-ins
proprietary formats
high spec machines

Why is point cloud data so underutilised?
POINTCLOUDS
Accurate
Visual
3D
Very detailed
Everything captured

Advantages:
MONUMENT MALL
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
MONUMENT MALL
LARGE SHOPPING MALL
MONUMENT MALL
LARGE SHOPPING MALL
MONUMENT 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
BIM MATURITY
'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
MYTHS
Existing Building Information
Modelling

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
Full transcript