STEP 3 - FREE STANDING MAST INSTALLATION (CONTINUED)
3.1 INSTALLING ANCHOR BOLTS (CONTINUED)
3.1.3 Post-Installed Anchor Bolts with Shallow Foundations (6 bolt pattern):
In addition to the requirements identified in
Step 1.4
, a minimum 6” thick reinforced concrete floor that is
free of cracks, seams, expansion joints, and walls is required. Foundation requirements are based on a
concrete compressive strength of 3000# per square inch, a soil bearing pressure of 2500# per square foot,
and a modulus of subgrade reaction of 150# per square inch per inch.
A) Anchor bolts (by others) must:
• have an ICC-ES listing demonstrating suitability for the application.
• be installed in accordance with the manufacturer’s instructions and requirements.
B) Base plate may be used as a template to drill holes in concrete floor. Follow anchor bolt manufacturer’s
recommendations for drill bit size, depth, and special inspection requirements.
Note:
Base plates are designed for poured foundations. Hole size may exceed anchor bolt manufacturer’s
recommendations. Contact Gorbel® Customer Service if a custom base plate is required. Drill
bushings or equivalent may also be used to reduce hole clearance. Bushings must not protrude above
base plate. If base plate hole diameter is greater than
bolt diameter plus 1/4”, refer to AISC Design Guide 1 for
minimum washer size and thickness recommendations.
C) Install anchor bolts and hardware according to
manufacturer’s installation instructions.
Diagram 3D
shows
a typical installation.
Note:
Before tightening hardware, follow instructions in
Step
3.2
for applying and curing grout.
3.2 Installing and Plumbing Mast
A) Cover entire base plate area with one inch of non-shrink precision grout.
B) Set mast into place and make sure that the base plate is completely
seated in the grout.
C) Thread a plumb line through Swing Arm mounting bracket holes and
hole in tapered plug (by others) as shown in
diagram 3E
.
D) Adjust mast as required until plumb line is centered in all the mounting
hole brackets.
E) Once mast is plumb
and grout has cured
, fully
tighten anchor bolt hardware.
F) Verify mast is still plumb.
DO NOT USE A LEVEL
TO PLUMB MAST.
WARNING
Shallow foundations are only appropriate for 8 foot span, one worker Swing Arms.
A A
6"
4"
1"
GROUT
EFFECTIVE
EMBEDMENT
QUALIFIED ADHESIVE
BASE PLATE W/
STIFFENER
1-1/2" OD X 1-1/8" ID
X 1" BUSHING
2-1/2" OD X 1-1/16" ID
X 1/4" WASHER
1"-8 X 8" A193/B7 STUD
HEXNUT
Diagram 3D.
Anchor bolt installation.
9
10/12 Rev. E
WARNING
Mast must be plumb to prevent Swing Arm from drifting.
TAPERED PLUG W/
CENTER HOLE
PLUMB BOB
Diagram 3E.
Plumbing the
mast.
