3" Top Caps Manual
Table Of Contents
1. BUILD BASE
GROUND MOUNT INSTALLATION MANUAL - 5© 2019 IRONRIDGE, INC. VERSION 2.8
1. BUILD BASE (CONT.)
A. MOUNT TOP CAPS
Mount a Top Cap on each pier. Wait to tighten set screws.
➢ If using Diagonal Braces, install them prior to Top Caps.
B. LAY CROSS PIPE
Set cross pipes or tubing in Top Cap grooves. Attach with
Torque U-bolts to 15 ft-lbs and align assembly.
Torque Top Cap set screws to 20 ft-lbs for Schedule
40 Grade B Pipe, 11 ft-lbs for 2.375” Allied Mechanical
Tubing, and 16 ft-lbs for 3.500” Allied Mechanical Tubing.
➢ To join more than one section of cross pipe, see Page 10.
2. CONNECT SUBSTRUCTURE
A
B
U-Bolt
15 ft-lbs
Set Screws
Schedule 40 Grade B Pipe: 20 ft-lbs
2.375” Allied Tubing: 11 ft-lbs
3.500” Allied Tubing: 16 ft-lbs
GROUND SCREW FOUNDATIONS
Follow respective Ground Screw Manufacturer’s installation methods for
driving screws into soil. Insert vertical piers into ground screws, ensuring
at least 18” of pier is inserted into ground screw.
Tested and/or Evaluated Ground Screws
2” System 3” System
Manufacture
Model #
American Ground
Screws N76
American Ground
Screws N102
Krinner North
America KSF G76
Krinner North
America KSF G114
Friction Bolt Torque
SCHD. 40: 90 ft-lb SCHD. 40: 120 ft-lb
Allied:75 ft-lb Allied:90 ft-lb
➢ A minimum ground screw length of 1300mm must be used
for either ground screw manufacturer. Longer lengths may be
required in areas with high wind and snow loads or risk of freeze-
thaw heaving. Check with your local jurisdiction for frost line
embedment requirements.
➢ Friction Bolt must be IronRidge supplied M16-2.0 x 40mm hot-dip
galvanized bolts.
Insert pipe at least 18” into
Ground Screw
Optional Cross Brace