Steve Jennings : Power, Process and Plant Division, Trimble Navigation Limited Jayan Mundakkal : Construction Automation Manager, Bechtel Construction Operations Inc.
Feb 23, 2016
Steve Jennings: Power, Process and Plant Division, Trimble Navigation Limited Jayan Mundakkal: Construction Automation Manager, Bechtel Construction Operations Inc.
• Laser Scanning Technology in Field Construction
Technology Adoption Past Indicators Analog to Digital Analogies Significance and Transition
• Real time verification and QA • Streamline design phase using actual as-
built data • 3D Scanning solutions
3D Scanning Mid / Long Range Terrestrial Scanners
Trimble VX Technology Time-of-flight
Speed Up to 15 pts/sec
Range 150m, DR range 800m
Distance Accuracy
1mm + 1ppm
Unique Features
Total station, imaging, 3D scanning: 3-in-1
Trimble GX Technology Time-of-flight
Speed Up to 5,000 pts/sec
Range 350m
Distance Accuracy
1.75mm @ 25m on 90% reflectivity
Unique Features
Smart scanning mode: SureScanTM, fast target
3D Scanning Short Range / High Speed Terrestrial Scanners
CX Technology WavepulseTM
Speed 54,000 pts/sec
Range Up to 80m
Distance Accuracy
1.2mm @ 25m on 90% reflectivity
Unique Features
Constant accuracy over full range
FX Technology Phase-shift
Speed Up to 210,000 pts/sec
Range Up to 46m
Distance Accuracy
0.8mm @ 25m on 90% reflectivity
Unique Features
Highest accuracy in short range on market
Field implementation – Successful Approach • People
– Survey team ownership, survey crew availability – Field and home office engineering engagement – Conceptualize 3D
• Process – Safety – Phased approach on scanning projects – Identification, measurement, validation and reporting of
potential benefits • Systems
– Right selection of hardware and software based on selected projects
– Integration, workflow and work process alignment of scanning project
• Leadership – Documenting and communicating ROI – Promoting, Educating and training – Building a community
Field Example – Modularization
Scan of vessel before shipping to identify any alignment issues with base foundation and center of bolt holes. Corrections can be made before shipping there by reducing risk and schedule delays
Field Example – Reduce Risk / Cost and schedule savings
Scan of rebar before concrete pour. All rebar and plates can be accurately located in the scan and referenced in the field post concrete pour. This reduces chances of intercepting steel during penetrations and other installations
Field Example – Reduce Risk / Constructability
Measure dimensions after construction and compare with engineering designs to validate anomalies. Multiple measurements and analysis can be done from a single scan and is available for future use.
Field Example – Reduce Risk / Constructability
Measure dimensions after construction and compare with design to validate anomalies. Measurements are also compared against fabricated units for constructability before shipping
Field Example - Precondition survey and documenting
Scanning asset condition before construction in high risk areas reduces risk and provides documentation on pre existing conditions.