Civil Engineering Chapter 30 Homework Backfill Along The Outside Edge The Forms

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Exercise 30
Concrete Form Preparation
The objective of this exercise is the proper installation of
straight and curved forms for a concrete pour.
Information related to this activity can be found in the
Successful concrete pours require proper installation of
forming materials. Forms must be constructed to create
the desired shapes, maintain the correct grades at the
edges of the project, and withstand the weight and force
of the concrete placed inside them.
Form construction begins with selecting the proper
nails or deck screws are installed from the inside edge of
the form.
Installation of Straight Forms
stakes along the outside edge of the 2 × 4.
Drive a form nail through the stake and into the
form, holding the top at the desired elevation for
the top of the slab. Placing the head of a sledge on
Repeat this stake installation at the other end of the
form. Adjust the elevation of the form by tapping the
stakes down or prying the form up until the entire
form is set at the required grade. Excavate high
points under the form if necessary. If specific grades
are required use a surveying instrument to set forms
at design elevations.
Locate and install the form on the opposite side
using the aforementioned steps. Place a 2 × 4
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124 Exercise 30 Concrete Form Preparation
Installation of Curved Forms
Clear the area where the pour is located
(Figure 30–2).
Set a piece of masonite on edge along the outside
of the project edge. At the high end of the form,
drive one of the stakes along the outside edge of
the masonite.
Install a nursery nail or deck screw through the form
and into the stake, holding the top of the form at
the desired elevation for the top of the slab. Placing
forms with a carpenter’s level on top to establish
the elevation of the second side.
Add additional stakes along curved forms every
1 foot, driving and fastening carefully so that the
elevation is not disturbed. Once in place, move to
Backfill along the outside edge of the forms when
complete. Trim the tops of the stakes flush with
the form.
Installation and Leveling
of Base Material
Complete backfilling on the outside of the forms
and trimming of stakes before filling inside.
Students should have successfully completed Exercise5,
A. Clear area for forms B. Drive stake behind form and fasten
to form. Adjust up or down to proper elevation
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Exercise 30 Concrete Form Preparation 125
A. Clear location for forms. Attach
stake to form at one end and adjust
up or down to proper elevation
B. Drive stake and fasten to form at
opposite end of form. Adjust to proper
elevation. Excavate under form if necessary
Figure 30–2 Curved form installation.
Forms Unleveled
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126 Exercise 30 Concrete Form Preparation
• Hand saw
Cordless drill and bits
50 foot heavy-duty extension cord and access to a
120V GFCI circuit
To complete this exercise construct forms for a 5 foot
wide concrete walkway that includes a 10 foot long
Note: This exercise practices installation of forms with
relative grades and cross-slopes. When construction
plans require specific grades, a survey level must be used
to establish the elevation of the tops of the forms.
5'-0" R
© Delmar/Cengage Learning.
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