## Presentation on theme: "Site Grading Site Grading Civil Engineering and Architecture"— Presentation transcript:

Unit 3 – Lesson 3.4 – Site Considerations Site Grading Project Lead The Way, Inc. Copyright 2010

Site Grading Construction requires preparation of the site

Cut and Fill Cut and fill should be balanced
Site Grading Civil Engineering and Architecture Unit 3 – Lesson 3.4 – Site Considerations Cut and Fill Cut and fill should be balanced May require several iterations Because it is expensive to move soil and because purchasing soil can add significantly to the cost of a project, engineers often attempt to minimize the movement of soil and balance the volume of cut and fill. During the design process, the engineer may alter the site design in order to equalize the cut volume with the fill volume. photo courtesy of constructionphotographs.com photo courtesy of constructionphotographs.com Project Lead The Way, Inc. Copyright 2010

Site Grading Civil Engineering and Architecture Unit 3 – Lesson 3.4 – Site Considerations Site Grading Calculations are performed to estimate the volume of soil to be added and the volume of soil to be removed Profile views document the difference between the existing grade and the final grade photo courtesy of constructionphotographs.com Project Lead The Way, Inc. Copyright 2010

Creating a Profile 104 100 96 Site Grading
Civil Engineering and Architecture Unit 3 – Lesson 3.4 – Site Considerations Creating a Profile To create a profile view, select the cutting plane line at which you would like a profile. [click] Next project the elevation of each contour line to a grid [click] and indicate the elevation with a point. [click] Only a few of the contour line elevations are projected here for illustration, but you should project the elevation of every contour line. [click] Once you have plotted all of the elevation points, connect the points with a line. This is the grade line. In this case, it is an existing grade and is therefore shown as a dashed line. [click] 104 100 96 Project Lead The Way, Inc. Copyright 2010

Calculating Cut and Fill Volumes
Site Grading Civil Engineering and Architecture Unit 3 – Lesson 3.4 – Site Considerations Calculating Cut and Fill Volumes Let’s look at placing a 20 ft by 60 ft parking lot on the lot. Assume that the base course of gravel will extend down to an elevation of 100 ft. Sketch the pavement in plan view. [click] Create a profile through the center of the pavement area to be graded. [click] Sketch the pavement at the appropriate elevation in the profile view. [click] 104 100 96 Project Lead The Way, Inc. Copyright 2010

Calculating Cut and Fill Volumes
Site Grading Civil Engineering and Architecture Unit 3 – Lesson 3.4 – Site Considerations Calculating Cut and Fill Volumes Shade the areas of cut and fill. Note that when the pavement is constructed, there must be a gradual slope at the edge of the pavement [click] because the soil cannot hold a vertical slope. We will neglect this volume of soil for simplicity.[click] Project Lead The Way, Inc. Copyright 2010

Calculating Cut and Fill Volumes
Site Grading Civil Engineering and Architecture Unit 3 – Lesson 3.4 – Site Considerations Calculating Cut and Fill Volumes A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 Sketch a grid on the pavement area. We will use a 10 ft x 10 ft grid. [click] Label each grid area so that you can refer to it later. [click] Project Lead The Way, Inc. Copyright 2010

Calculating Cut and Fill Volumes
Site Grading Civil Engineering and Architecture Unit 3 – Lesson 3.4 – Site Considerations Calculating Cut and Fill Volumes 101' 98' 98' 99.5' 100.5' 100' 100' Indicate the approximate elevation of each grid intersection on the plan view. [click] For the existing grade elevation, take the average of the four corners of the grid area. For area A1, the average is 98 feet. Tabulate this data in a table (next slide). 98' 98' 99' 100.5' 102.5' 101' 100' 98' 98' 99' 100.5' 101' 101' 100' Project Lead The Way, Inc. Copyright 2010

Calculating Cut and Fill Volumes