General Costing Comparisons Once we have narrowed down the most suitable product/design option(s), we can use our proprietary estimating tool to generate costing comparisons. Below is an example of a comparison between geogrid reinforced and multi depth gravity designs for a proposed 2m high wall. Costing is broken down into Material and Labour, and Material Only so it is clear where the true costs are.
Project Specific Quantity Estimates VESPA MSE (Mechanically Stabilized Earth) design software was created by retaining wall design experts to provide accurate quantity estimates and comprehensive reports while simultaneously performing the necessary analysis in accordance with CMHA (Concrete Masonry and Hardscape Association) methodologies.
WHAT WE NEED FROM YOU? A scalable site plan complete with TOW (top of wall) and BOW (bottom of wall) elevations is ideal, but hand sketches will work as long as the distances between elevation points are provided. WHAT VESPA DOES Once we input the dimensions of the wall, along with some site specific design details, VESPA generates a wall profile (upper part of screen) and series of cross sections (lower part of screen). The wall profile shows the location of every single unit within the wall. The cross sections show the required lengths of geogrid, depths of stabilized backfill, or number of multi depth units (as applicable), for each panel in the wall.
VESPA now does multi depth gravity wall design!
Quantities Wall
WHAT OAKS GIVES TO YOU Material quantities (see adjacent) can be exported directly from VESPA that list not only the area and length of the wall (from which we can determine the retaining wall product needs) but also the volume of aggregates needed for the levelling pad, reinforced fill (where applicable), and drainage fill as well as the quantity of geogrid and geotextile needed.
Length [m] Wall/Cap
Area [m²] Facing
Area [m²] Total Wall
Facing Proterra Proterra
East Wall West Wall
64 22 85
66
78 12 89
8
73
[m³] Pad Leveling
[m³] Fill Reinforced
[m³] Fill Drainage
[m³] Fill Core
Wall
East Wall West Wall
6.6 2.2 8.8
45.8
16.2
0.0 0.0 0.0
In short, there is more than sufficient information available for local contractors to generate an accurate price estimate.
0.0
1.5
Totals:
45.8
17.6
Reinforcements
[m²] SG200
Connectors Geogrid
Wall
East Wall West Wall
202.3
0 0 0
0.0
Totals:
202.3
25
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