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Dr.Dirt Papers by Dan Atcheson
Cross Sections
BALANCING A ROADWORK PROJECT USING QUEST FOR CROSS SECTIONS
ENTERING METRIC STATION NUMBERS IN QUEST FOR CROSS SECTIONS
USING QUEST FOR CROSS SECTIONS TO TAKE OFF PHASED HIGHWAY CONSTRUCTION
SETTING UP STATIONS IN QUEST FOR CROSS SECTIONS WHEN THERE IS A GAP IN THE WORK

BALANCING A ROADWORK PROJECT USING QUEST FOR CROSS SECTIONS
You can balance a roadwork project by using the following formula:
Change in Elevation of Proposed Layer = Import (or Export) / Volume of Topsoil Stripped
The depth of topsoil stripped must be temporarily set at one foot while making this calculation.
Keep in mind that if the project requires import, the proposed layer must be raised. If the project requires export, the proposed layer must be lowered.

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ENTERING METRIC STATION NUMBERS IN QUEST FOR CROSS SECTIONS
Some metric plans designate station numbers as follows:

0 + 000        Meaning 0 thousands + 0 hundred meters
0 + 100        Meaning 0 thousands + 100 meters
etc.
etc.
0 + 900        Meaning 0 thousand + 9 00 meters
1 + 000        Meaning 1000 + 0 hundred meters
1 + 100        Meaning 1000 + 100 meters
1 + 150        Meaning 1000 + 150 meters
etc.

In order to enter these types of station designations in Quest for Cross Sections, simply move the plus sign (+) one place to the right; i.e.:

0 + 000    changes to     00+00
0 + 100    changes to    01+00
etc.        
etc.
0 + 900    changes to     09+00
1 + 000    changes to    10+00
1 + 100    changes to    11+00
1 + 150    changes to    11+50
etc.


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USING QUEST FOR CROSS SECTIONS TO TAKE OFF PHASED HIGHWAY CONSTRUCTION
An example of phased highway construction is when you are required to perform the following sequence of events:
1. Construct a new set of lanes while allowing traffic to continue over an existing road.
2. Detour traffic onto the new lanes while you are re-working the existing road.
3. Open all lanes to traffic.
Perform the following steps to do a takeoff that reflects the fluid changes in the project:
1. Digitize the existing and proposed grades in each cross section for Phase 1 as you normally do; however, you must digitize the proposed surface from the far left to far right, even if you have to superimpose portions of the proposed surface right on top of the existing surface (Figure 1). The results will reflect the cut and fill required to accomplish the work of Phase 1.
2. Make a copy of the job file.
3. Delete the existing surface in each cross section, then enter the proposed surface as though it were the existing surface (Figure 2). The results will reflect the cut and fill required to accomplish the work of Phase 2. NOW HERE'S THE "RUB": Any cut quantities calculated in Phase 2 must be considered as fill, and any fill quantities calculated must be considered as cut, since we have reversed the roles of the existing and proposed surfaces.
4. If Phase 3 must be run, make a copy of Phase 2, delete the Phase 2 proposed grades, then digitize Phase 3 proposed grades (Figure 3). The results will reflect the cut and fill required to accomplish the work of Phase 3.
If more phases must be calculated, repeat this process and keep in mind that the cut and fill quantities must be reversed in every other phase; i.e.,
Phase 1        Cut = Cut and Fill = Fill
Phase 2        Cut = Fill and Fill = Cut
Phase 3        Cut = Cut and Fill = Fill
Phase 4        Cut = Fill and Fill = Cut, etc.

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SETTING UP STATIONS IN QUEST FOR CROSS SECTIONS WHEN THERE IS A GAP IN THE WORK
Some roadwork projects require work through several stations, followed by a series of stations requiring no work, followed by another series of stations requiring work. Under these circumstances, create a series of stations, from start to finish, including stations containing no work. Then locate the drawing fields and digitize the end areas throughout the portions of the road requiring work, but don't locate the drawing fields of stations requiring no work. This procedure will eliminate calculations within the portions of the road requiring no work.

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