STEP 3 - FREE STANDING MAST INSTALLATION
3.1
INSTALLING ANCHOR BOLTS
3.1.1
Refer to
diagram 3A
or
3B
and
chart 3A
for bolt hole size and pattern for base plate thickness.
3.1.2
Cast-in Anchor Bolts with Poured Foundations
(6 or 12 bolt pattern):
A) Anchor bolts (by others) must:
•
be 1” diameter for 1-1/4” diameter base plate holes and
1-1/4” diameter for 1-1/2” diameter base plate holes.
•
be embedded 3/4 of footer depth (L).
•
have
minimum
of two threads above nut after installation.
B) Create steel-reinforced concrete foundation using
recommendations shown in
diagram 3C
.
Refer to
chart 1B
, page 5, or
chart 1C
, page 6, for footer depth (L)
and footer width (M) in
diagram 3C
.
Note:
7/16” thick, wafer board, bolt hole templates are available to
facilitate anchor bolt alignment. Foundation requirements are based
on soil pressure of 2500# per square foot. Concrete
pressure recommended for foundation is 3000# per square
inch of compressive force.
Note:
Foundation/concrete must cure seven (7) days prior to mast
installation. Foundation/concrete must cure 28 days prior to
using Swing Arm.
C) Proceed to
Step 3.2
, page 9, for mast installation and
plumbing.
STOP!
Do not proceed if your foundation does not meet the size and loading requirements identified in
Step 1.4
.
WARNING
Consult a qualified structural engineer if you deviate from the recommended dimensions provided
in this manual or the General Arrangement Drawing. Gorbel, Inc. is not responsible for any deviation
from these foundation recommendations.
60°
MAST
HOLE
2" OFFSET
B.C.
Diagram 3A.
6 bolt base bolt pattern.
60°
HOLE
MAST
4"
2" OFFSET
B.C.
Diagram 3B.
12 bolt base bolt pattern.
Diagram 3C.
Poured foundation.
Chart 3A.
Base plate dimensions.
8
10/12 Rev. E
Mast Diameter
8-5/8”
12-3/4”
14”
16”
18”
20”
6 Bolt or 12 Bolt Base
6
6
6
12
12
12
Diameter of Bolt
Circle (B.C.)
24”
24”
30”
36”
42”
48”
Diameter of Bolt Hole 1-1/4”
1-1/2”
1-1/2”
1-1/2”
1-1/2”
1-1/2”
Hole Stiffener
No
Yes
Yes
Yes
Yes
Yes
Base Plate Thickness
Including Stiffener
1/2”
1-1/4”
1-1/4”
1-1/4”
1-1/4”
1-1/4”
TIP:
Cast-in anchor bolts (J bolts) typically protrude
6” above foundation before mast is installed.
