Confident estimating requires precise Take-off.
 Terrain-Link Trenches™
provide accurate excavation and backfill quantities based on changing ditch
depths, using either earthwork contours from your site takeoffs or directly from
digitized profiles.
Many
general estimating programs contain "pipe" or utility modules for calculating
trench excavation.
First a typical ditch cross section is entered, next a pipe
length is either entered or traced with a digitizer, and finally the volumes are
calculated. This type of calculation is fine for utilities that remain at an even depth
below grade, such as water or conduit. Of course these are fairly easy calculations, even
when calculating using manual methods.
 Sanitary
and Storm drainage systems are much more difficult to
calculate, as the pipe runs from structure to structure in a
straight line, while the trench depth varies with the
terrain. Here's where InSite's Terrain Link Trenching
excels.
If you have entered soil borings, your excavation quantities are listed
by strata. No other software has this capability at any price! Follow along as a
utility take-off in InSite SiteWork is done step by step.
TDS's
Utility Take-offs can be done by using the earthwork take-off to general
profiles, or by tracing the profiles. Either way, the first step is to create a
library of Typical Ditch Cross Sections (TDS's).
The
TDS describes the excavation shape (including OSHA maximum vertical side height
and layback slope), pipe dimensions, and
top and bottom backfill thickness.
Layout The next step is to locate the structures. Since InSite will use the
earthwork take-off data to create utility profiles, the earthwork subgrade data
has been displayed for clarity.
Information is then entered for each structure.
and each pipe run, including the invert elevations at the end of each pipe
If only one invert is known, a slope (percent) can be entered, and InSite
will calculate the unknown invert.
Once the structure and pipe data has been entered, it's time to calculate
the results. A series of cross sections are taken down the trench, at user
selectable intervals. InSite uses the earthwork data to generate profiles, and
calculates the results. As the calculations are made, a schematic showing the
trench depths (cut brackets) are shown. The RockAlert™ feature is used to give an
indication of a specific strata.
For clarity on the illustration below,
the zoom tools were used to focus on the utilities on the lower right portion of
the site. Click on the image to see the complete utility take-off.
To View a profile, select Display/Edit profile from the pipe menu, and
click on the first and last structure of the desired profile.
The profile, showing all the structures, connected pipes, and underground
strata layers can be displayed. Profiles can also be printed or plotted at
scale.
Once the utilities have been entered, InSite SiteWork gives complete reports.
Utility Summary Includes:
Click Here for Section
Utility Summary
- Total Excavation for the entire utility take-off including the structure excavation. Includes
breakdown by strata for take-offs with borings.
- Cut Bracket Quantities.
Lists the linear feet of excavation in a depth range set by
the estimator.
- Backfill Materials Quantities. Total of all backfill materials for both pipe and structures.
Pipe Report Includes:
Click Here for Pipe
Report
Total Excavation, Cut Bracket
Quantities, and
Backfill Material Quantities
for each individual pipe type (example 8" pipe totals, 12" pipe totals,
etc.)
Structure Report Includes:
Click Here for Structure
Report
- Structure List for the entire utility take-off
organized by structure description. Includes Structure
Dimensions and Structure Height.
- Structure Excavation. Includes breakdown by strata for take-offs with borings.
- Structure Backfill. Totals of all backfill materials for structures.
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