pcs900 accugrade 3d paving training 3d design models svo/ago tbc
DESCRIPTION
Agenda 3D Designs Design Accuracy SVO / AGO Differential CompactionTRANSCRIPT
PCS900 AccuGrade 3D Paving Training 3D Design Models &
SVO/AGO & TBC
May 2009 Phil Jackson CTCT Training Manager Agenda 3D Designs
Design Accuracy SVO / AGO Differential Compaction 3D Designs The
design is critical
If the design is wrong the surface is wrong Less important in
grading Because the paver can smooth it out You are the paver The
last chance to get it right Design Types Parametric Roads TINs
Grids
Each have their strengths and weaknesses We must understand the
strengths and weaknesses of each Parametric Roads This is a road
described by its design elements
Horizontal Master Alignment Vertical Master Alignment Templates
Superelevation Widening OR By Strings Parametric Roads Typical
Parametric Road Parametric Roads Typical Parametric String Road
Parametric Roads This is the most accurate way to describe a
road
Problem is that every program does it differently Dozens of road
formats to understand PCS900 / AccuGrade UTS for Asphalt Paversdoes
not understand any Parametric Road formats TINs TIN is a
Triangulated Irregular Network
Or a mesh of triangles that describe a surface TIN Models Again
there are many different formats to describe a TIN
Trimble uses several All work well in the program that designed
them Some work in other programs PCS900 / AccuGrade uses the SVD
format Proprietary to GCS, CCS, PCS, & AccuGrade Grids Grids
are rectangular (usually square) meshes where each intersection has
a height assigned to it Very simple way to describe a surface But a
coarse description Grids Where is the valley or the ridge?
Grid height may miss the high or low point Completely random with
respect to the real features it describes 10 20 10 20 Design Format
for Paving
Dont use grid data Unless you have a very special (unusual) case
Try to get as raw a format as you can Get the parametric road data
NOT a TIN of the parametric road Certainly not a Grid of the road
Then use SiteVision Office or AccuGrade Office to produce the
SVD/SVL files for the paver How to TIN a Road Use SVO or AGO or
TBC
A lot of programs can TIN roads Today, only SVO/AGO or TBC can
produce an optimized TIN that is accurate enough Designed for
optimum machine guidance How NOT to TIN a Road This is an example
of a TINed road where the sides of the triangles are one length on
the straights and one different length in the curves A crude model
that is OK for surveyors How NOT to TIN a Road Take a Profile down
the center of the lane
Do you want to pave this surface? How NOT to TIN a Road
Problem:
To make the triangles small enough to be accurate you get too many
Large model Slow to query How to TIN a Road Use SVO or AGO or
TBC
Take a Profile down the center of the lane Do you want to pave this
surface? Trimble Exchange An Engine behind SVO/AGO
This is the program that SVO/AGO uses to intelligently TIN a road
Very complex to design Reads over 30 different road formats Very
easy to use So easy you dont even know it is there Optimizes the
TIN Lots of small triangles where the surface changes Few large
triangles where the surface is constant Trimble Exchange An Engine
behind SVO/AGO
Lots of small triangles Few large triangles Triangle density also
changes across the road Guarantees the surface to match to 1 mm Or
whatever you set it to Check Your Design BEFORE you start paving,
check the design
Look at the design in 3D Be careful that the 3D picture is a true
representation of your final paving design It might be a 3D picture
of the original data Which could be different Pull Profiles down
the centers of the lanes The edges should be smooth in all cases
Run the design in the Emulator to check what the operator will see
PCS900 / AccuGrade Design Formats
PCS900 / AccuGrade only reads the SVD/SVL formats which are
proprietary to Trimble and Caterpillar SVD describes a surface as a
TIN SVL describes plan detail as lines, arcs, text, & Master
Alignments PCS900 / AccuGrade Design Formats
Use either SVO or AGO or TBC to produce the designs for 3D paving
PCS900 AccuGrade 3D Paving Training Design for Differential
Compaction
May 2009 Phil Jackson CTCT Training Manager 3D Designs 3D Designs
describe the final finished surface
Grading systems use vertical offsets to build up to this surface
The final asphalt lift is designed to finish at this surface But we
must allow for compaction So we need to lay the asphalt high Paving
& Rolling Asphalt Compaction & Designs
2D Systems lay a constant thickness over the base Therefore the
compaction is constant Say: Design is 50 mm lift Mix gives 25%
Compaction Therefore lay 66.7 mm Compact 25% Get 50 mm lift(66.7 mm
- 25% = 50 mm) 3D Compaction Problem If you lay a thicker lift you
get more compaction 3D Compaction Problem Design Asphalt Laid
Asphalt Compacted Asphalt
Design Base Actual Base 3D Compaction Solution Design Asphalt Laid
Asphalt Compacted Asphalt Design Base Actual Base Measure the
Actual Base and design the Laid Asphalt surface Load the Laid
Asphalt surface as the design 3D Compaction Solution Lay the
asphalt to the Laid Design
Thicker over the hollows Then rolling will leave a smooth level
surface Differential Compaction Surface
Good for long slow changes in thickness Bad for short sharp changes
like potholes You cant build or roll short sharp changes 3D
Compaction Solution Measure the actual base
Use UTS & SCS900 Use AccuGrade Roller or CCS900 mapping Use
GCS900 or AccuGrade mapping Process the design in Terramodel
Procedure is written up as a Trimble Construction Training Bulletin
The target audience is somewhat familiar with Terramodel,
SiteVision Office (SVO) and the process of collecting data,
creating a model and using that model with SVO. How to create a
differential compaction surface model using Trimble
Terramodel
When creating a surface model for the purpose of paving, frequently
it is desired to adjust the surface for the effects of differential
compaction or to make similar types of adjustments. This document
will introduce the workflows and Trimble Terramodel commands that
can be used to create differential models. The example project is a
portion of an actual project simplified to demonstrate the
technique. Users must consider many factors when modeling a job and
this example may not reflect the density of the data needed to
provide the desired accuracy. High level summary of the
workflow:
1. The user measures a surface of the original conditions. This can
be done by collecting points and breaklines using Trimble SCS900
Site Controller Software. 2. The data is imported into Terramodel
and an original surface is created. 3. The proposed surface is
created. This can be done by importing from another format or using
the design capabilities of Terramodel. 4. The difference between
the existing and proposed surfaces is computed and saved as a
difference surface. 5. The desired adjustments are applied to the
difference surface. These adjustments can be a consistent depth or
by applying a scale factor. 6. The difference surface is added to
the proposed surface to create a target surface. 7. The target
surface is transferred to the field system for construction. 8. The
target surface is constructed and compacted with the resultant
surface equal to the design surface. How to create a differential
compaction surface model using Trimble Terramodel
Real Answer: It is a bit complicated but a competent data person
can easily follow these instructions and produce the design PDF of
this procedure will be distributed with the class material