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Engineering Surveying Exam Review

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					Innovative Surveying Solutions
 Sunflower Pump Station Trough and Auger
        Rehabilitation - Pump No. 2




  Presented by Timothy R. Case, PLS
Laser Scanning Equipment
Auger Scan – Scope of Services
 •Perform High Definition Laser Scanning
 •Provide laser scanning of the final rehabilitated trough area and
 auger flights after all coating systems have been applied.
 •Compile point cloud data to assemble a three dimensional model of
 the new cradle (trough) and auger in Cloud Worx (or equal) software
 (Cyclone). The rehabilitated concrete cradle shall be represented by
 a triangulated surface together with the rotational axis of the bearing
 plates. Submit graphical representation of trough and auger flights
 based on elevation to the Sanitation District for documentation.
 •The gap between the finish surface of the auger flight edges and the
 finish surface of the trough shall not exceed 0.50 inches nor be less
 than 0.25 inches along the entire length of the trough to auger
 interface.
 •If the gap is not as specified, the Contractor shall make corrections
 and remediate the auger flight(s) outside diameter(s) and/or surface
 of the trough prior to auger being installed. The Contractor shall re-
 scan and re-validate the remedial work with the laser scanner to
 verify that the gap is within tolerances.. A stamped and signed report
 shall be submitted by the surveyor documenting that the surfaces
 are within tolerances prior to reinstallation.
           Auger Scan
Photo of Auger in its Rehabilitation Cradle
           Auger Scan
Photo of Auger in its Rehabilitation Cradle
           Auger Scan
Photo of Auger in its Rehabilitation Cradle
           Auger Scan
Photo of Auger in its Rehabilitation Cradle
Trough Scan
Trough Scan
Trough Scan
Auger Registration
Trough Registration
Auger Point Cloud
Auger Point Cloud
Surrounding Artifacts Removed
Trough Point Cloud
   View from Bottom up
Trough Point Cloud
   View from Top Down
Trough Radius
Rotational Radius
Station 0.00 set at Bolt Hole
Rotational Radius
    View along Z Axis

                Y-Axis




  Station 0+00 set at Bolt Hole
                                  X-Axis
Rotational Radius
    View Along Y-Axis

             Z-Axis – Stationing




 Sta 3.20




                             X-Axis
  Sta 0.00
    Rotational Radius Verification
Calculated from Total Station Measurements to Targets on
         Auger Rotated Through Three Positions
Auger Flight Radius Calculations
     Limit Box with 1-ft slice – Profile View
Auger Flight Radius Calculations
         Limit Box with 1-ft slice – Plan View


    X: -1.809
    Y: 4.413
    Z: 3.50 (Station)
                              Scan Shadow




     Extracted Point
     Coordinates from
     Point Cloud

                                         Reference
     X: -3.541
                                         Beam
     Y: -2.759             Scan Shadow
     Z: 3.20 (Station)
Auger Flight Radius Calculations
Final Report
Additional Observations
    Flight Edge Skew – 0.02’
 Additional Observations
       Reference Beam Skew – 0.02’-0.03’
Note : Same Skew as seen on Auger Flight Edges
                 Lessons Learned
• Use more registration points (5+) when performing high accuracy
  scanning.
• Use 360° targets (spheres) when performing high accuracy
  scanning.
• Set targets as close to actual control point as possible when
  performing high accuracy scanning.
• Identify specific areas/points/surfaces that will be used to merge
  scan registrations (register individual point clouds together) ahead of
  time before performing the field scans.
• Use maximum residual points as basis for registration/interference
  calculations and analysis.
• Perform extra high and extra low scan worlds to obtain high and low
  area point clouds lost from shadowing effect.
• Be VERY careful to not include artifact points in cloud used for 3D
  figure modeling.
• Have a contingency plan
Questions

				
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posted:8/27/2012
language:English
pages:32