Takeoff Tutorial
Lesson 3: Trench Network Quantities
This lesson takes a drawing file through the steps
of trench network quantities.
Step 1 (Start Takeoff):
Click the Windows icon for Takeoff to launch the
program.
You may be presented with a “Startup Wizard” dialog and if so, click
Exit.
Step 2 (Open Drawing):
From the File menu, choose Open and select
DEMO3.dwg
from the Takeoff Work folder
(ie. C:\Program_files\Carlson_Takeoff_2004\WORK\DEMO3.dwg).
Step 3 (Make Existing and Design Surfaces):
In order to calculate trench quantities and profiles, we need surfaces
for the existing
ground and design.
First we need to define the layers of the surfaces. Run
Tools->Define Layer Target/Material/Subgrade. Then from the tab
labeled "Other", highlight "EX_CTR" from the layer list, pick
"Existing" from the Move To list and pick the Move To button. Next,
highlight "RD RF CONT", choose "Design" from the Move To list and pick
the Move To button. Now choose the Save and then Exit buttons.
This assigned layer "EX_CTR" to the existing ground surface and "RD RF
CONT" to the design surface.
Next, let's set the site perimeter. Run Tools->Boundary
Polyline->Set Boundary Polyline. At the command line, there is a
prompt:
Select boundary polyline:
Pick anywhere along the six sided perimeter polyline in the drawing.
Now, to make
the existing ground surface, run
Tools->Make
Existing Ground Surface. Then to make
the design surface, run
Tools->Make Design Surface.
Step 4 (Input Trench Network Data):
The trench network data consists of linked structures where each
structure has a name, location (x,y), invert-in, invert-out and rim
elevation. Each structure link has a pipe size. There are two ways of
entering the trench data. When the drawing contains polylines for the
trench lines and labels with the trench data, then you can use Input
Trench From Polyline. Otherwise, there is the Create Trench Network
Structure command which let's you pick the structure locations and
enter the data in a dialog.
Method 1 (Input Trench Data From Polyline):
In this example, there is trench data already drawn in the drawing.
Zoom in around the upper right area of trench line by running
View->Zoom->Window and picking two corner points around this
area.
Then run Trench->Input Trench From Polyline and an options dialog
appears. In this case, we want Trench Type as Sewer because there are
manhole rim elevations. Also Prompt For Invert-In Elevations is active
since this example has a manhole with multiple connections with
different invert-ins. And Connected Network is used so that the trench
data can be used by the rest of the trench routines. The Individual
Profile option will only create a profile (.pro) file. Fill out the
dialog as shown and click OK.
The rest of the prompting for this command is on the command line as
the program walks through the trench line. For each point in the trench
polyline, the program zooms the drawing to that point. The trench data
can be picked from labels in the drawing. If the drawing doesn't have
labels for the data, then you can enter the values.
Pick a polyline that represents a trench reach: Pick the trench polyline
Starting Station of trench reach <0.0>: 0.0
For station 0.00 ...
Enter/<Select text of Manhole ID>: Pick the DCB 368 label. (If you
had a drawing without a manhole ID label, then type E for Enter and
enter the ID)
ID: DCB 368
Undo/Enter/<Select text of Invert-in elevation>: Pick the I Out=174 label. (Since
this is the upstream starting manhole, there really isn't a separate
invert-in. So we are using the invert-out).
Invert-In: 174.000
Undo/Enter/<Select text of Invert-out elevation>: Pick the I Out=174 label.
Invert-Out: 174.000
Undo/Enter/<Select text of manhole rim elevation>: Pick the R=178.75 label.
Rim: 178.750
For station 201.44 ...
Enter/<Select text of Manhole ID>: Pick the DCB 367 label.
ID: DCB 367
Undo/Enter/<Select text of Invert-in elevation>: Pick the I In=172.85 label.
Invert-In: 172.850
Undo/Enter/<Select text of Invert-out elevation>: Pick the I Out=172.35 label.
Invert-Out: 172.350
Undo/Enter/<Select text of manhole rim elevation>: Pick the R=178.5 label.
Rim: 178.500
Undo/Enter/<Select text of pipe size>: Pick the 15" HDPE label.
Pipe Size: 15.0
For station 327.09 ...
Enter/<Select text of Manhole ID>: Pick the CB 347 label.
ID: CB 347
Undo/Enter/<Select text of Invert-in elevation>: Pick the I In=170.540 (CB 367) label. (This
is the invert-in for the connection to the CB 367 structure that this
trench line connects to.)
Invert-In: 170.540
Undo/Enter/<Select text of Invert-out elevation>: Pick the I Out=166.1 label.
Invert-Out: 166.100
Undo/Enter/<Select text of manhole rim elevation>: Pick the R=176.5 label.
Rim: 176.500
Undo/Enter/<Select text of pipe size>: Pick the 15" HDPE label.
Pipe Size: 15.0
Another Polyline [<Yes>/No]? N
for no.
That completes this trench run and Takeoff draws its own trench
polyline and labels.
Method 2 (Create Trench Network Structure):
The drawing contains another trench polyline and we could use Input
Trench Data From Polyline again. Instead for practice, let's use the
Create Trench Network Structure method. First we need to zoom to the
new trench location. Run View->Zoom->Extents and then
View->Zoom->Window and pick two points for a window around the
lower right trench point (CB 349). Then run Trench->Create Trench
Network Structure. At the command line, there is a prompt for how to
locate the structure position. Choose Pick.
Locate by pick point, point number or station-offset
[<Pick>/Number/CL]? Pick
Next, there is a prompt to pick the position. To get the exact end
point of the trench polyline, use the end point snap. The end point
snap can be turned on by a number of different ways including the
Settings->Object Snap command. In this case, type "end" and then
space or enter. This puts the program in end point snap mode. Now move
the pointer along the trench polyline until the end point snap icon is
at the manhole location and then pick.
Pick structure location: end of
(pick point)
Now a dialog appears for entering the structure data. Fill in the
Structure Name as CB 349, the Rim Elevation as 187.8 and the Invert-Out
as 178.3 and then pick OK.
All the structures are now created. The last step is to link this new
structure to the network. We need to zoom to the next trench location.
Run View->Zoom->Extents and then View->Zoom->Window and
pick two points for a window around the left trench point (CB 347). Now
run Trench->Edit Trench Network Structure and pick either the symbol
for CB 347 or the label. Then a dialog appears with the data for CB
347. From the Available list, highlight CB 349 and pick Add. This
creates a link from CB 347 to CB 349 and the link data is shown at the
bottom of the dialog. Enter the Invert-In as 171 and the Pipe Size as
24. Then pick OK.
Step 5 (Input-Edit Trench Template):
The Trench Template defines the size of the trench for quantities. Run
Trench->Input-Edit Trench Template. You are first prompted for a
trench template file name. The Trench Template data is stored in a file
that has a .tch extension. Choose the New tab, enter a file name like
DEMO3 and then pick Open.
Next, there is a dialog for entering the trench dimensions. The Bottom
Offset is the distance from the bottom of the pipe to the bottom of the
trench. The Trench Width is the base width of the trench. The Vertical
Side Height is the height from the bottom that the side walls are
vertical until switching to the cut slope. If the surface is not
reached by the vertical side height, then the cut slope is used for the
rest of the distance to the surface. Edit Trench Benches allows you to
set up to four benches in your trench. Display Sewer Structure allows
you to see your pipe or manhole as part of the trench. Note: This is
for display purposes only, calculations will be drawn from the pipe
size you set in the Trench Network Structure commands. Add Pipe
Diameter To Trench Width will increase the size of your trench by the
diameter of your different pipe sizes. The Cut Slope
can be entered in
slope percent, ratio or degree format. The Backfill materials are
optional. Up to three materials can be entered from the bottom.
Fill out the dialog as shown and pick Save and Exit.
Step 6 (Trench Network Quantities):
To calculate and report the trench quantities, run Trench->Trench
Network Quantities. A dialog sets the report options. Check on
Calculate All Trenches to get the quantities for the whole network. To
get the trench cut volume, check Use Trench Template For Quantities and
pick Set Trench Template and pick DEMO3.TCH. Also turn on Report
Backfill Volumes to use our backfill material settings from the trench
template. Finally, fill out the depth zones in the intervals that you
are interested in. In this case, use 15, 20 and 25. The depth zones
will be colored in the plain view. Once the dialog is
filled out as shown, pick OK and the report is shown.
The report includes:
- The structure names at the start of each trench run included in the
report.
- The trench template dimensions.
- The cut volume.
- The backfill volumes.
- The number of manholes and length of trench within each depth zone.
The depth zones in the plain view with Zone Map Color Legend.
Step 8 (Draw Trench Network Profile):
To draw a profile of the trench line, run the Trench->Draw Trench
Network (Profile) command. There is a dialog to select the starting
structure for which trench line to process. Choose DCB 368. Also, there
are options whether to draw the existing ground, design surface and
strata surfaces if available. You can also choose the profile direction
to go upstream or downstream. The Save To Profile File will create a
profile (.pro) file for the trench. Fill out the dialog as shown and
pick OK.
Next the Draw Profile dialog appears. Set the Horizontal Scale and
intervals to 50 and the Vertical Scale and intervals to 25. This will
make for two to one vertical exaggeration for the profile. When the
dialog is filled out as shown, pick OK.
Next, there are prompts at the command line for the profile grid
elevations and profile location.
Bottom Elevation of Profile Grid <150.0>: Press Enter
Top Elevation of Profile Grid <200.0>: Press Enter
Pick Starting Point for Grid <409458.0 , 207303.0>: Pick a point in a blank area off to the
side of the drawing.
Next there are two dialogs with lots of settings for how to draw and
label the trench profile. Let's go with the defaults except change the
Type Of Pipe to HDPE. When the settings are ready, click the OK button
for each dialog.
There is a final command line prompt for whether to use the manhole
elevations. Enter Yes which will use the rim elevations defined in our
trench network.
Use manhole elevations from profile [<Yes>/No]? Y for yes.
The profile shows the existing ground at the top, then the design
surface and then the trench.
