# Civil Engineering Chapter 24 Homework Most wall materials are manufactured with units should set on the radius

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Authors David Sauter

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102
Exercise 24
in Segmental Unit
Retaining Walls
OBJECTIVE
The objective of this exercise is to properly construct
radius corners using segmental unit retaining wall
materials.
INTRODUCTION
Construction of radius corners using segmental unit
wall materials requires patience. Adjusting unit spacing
and modifying materials takes time, and the difficulty in
Mark the desired radius on the base material
using marking spray paint. The fronts of the
units should set on the radius line.
First course installation should use full units
placed so the tapered back edges are spaced
close together (Figure 24–1). The amount that the
units are spaced will be determined by the design
radius, with the spacing evenly distributed over
the entire curve.
Each subsequent course should be installed
Inside radius, or concave, corner construction with
segmental wall units should be executed as follows:
Mark the desired radius on the base material
spacing evenly distributed over the entire curve.
Each subsequent course should be installed with
the units fanned wider and wider. Pinned units
may require use of the back pin location to allow
97171_24_ch24_p102-104.indd 102 14/06/10 9:00 PM
Exercise 24 Installing Radius Corners in Segmental Unit Retaining Walls 103
PREREQUISITE EXERCISES
Students should have successfully completed Exercise 5,
Tool Operation and Construction Techniques, Exercise 6,
Cutting of Paving and Wall Materials, and Exercise 22, Wall
EXERCISE DESCRIPTION
To complete this exercise construct the segment of land-
scape retaining wall shown in Figure 24–2. Complete the
base as directed in Exercise 22. The wall should be con-
Convex curves with
angled sided caps
Convex curves with
straight sided caps
Minimal space
between units No space between
units. Units must be
cut to fit
Wide space
between units
Minimal space
between units
97171_24_ch24_p102-104.indd 103 14/06/10 9:00 PM
104 Exercise 24 Installing Radius Corners in Segmental Unit Retaining Walls
Note: This exercise practices installation of a wall with
relative grades. When construction plans require specific
grades, a survey level must be used to establish the eleva-
tion of the base and first course.
Figure 24–2 Radius corner layout plan.