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© 2014 Foundation Supportworks
®
,
Inc.
All Rights Reserved
p 326
APPENDIX 4D
SMARTJACK® SYSTEMS
Chapter 4
Miscellaneous Structural Support Products
SJ288TI (Threaded Insert):
Ø
3.00” OD x 1.00” thick machined and tapped insert,
ASTM A108 Grade 1018. Yield strength = 56 ksi (min.),
tensile strength = 90 ksi (min.).
Allowable compression for system heights up to 9 feet = (will
not govern)
SJ288T36, SJ288T60, SJ288T84 (Tube):
Ø
2.875” OD x 0.165” wall x 36”, 60”, or 84” long field
cut to length, ASTM A500 Grade C triple-coated in-line
galvanized. Yield strength = 50 ksi (min.),
tensile strength = 55 ksi (min.).
Allowable compression for system heights up to 9 feet = 11.0 k
SJAFT6 (Cast Aluminum Base):
0
.85” x 12.00” square AISI/AA 356.0-T6 cast aluminum.
Yield strength = 20.0 ksi (min),
tensile strength = 30.0 ksi (min.).
Allowable compression = 8.0 k
SJ288BP (Bottom Plate):
1
” x 3.50” square ASTM A36 plate and HSS
2.00 x 2.00 x 0.25 tube x 0.75” long ASTM A5 on Grade B.
Allowable compression (when used against concrete with
minimum f’c = 2,500 psi) = 10.7 k
Precast Concrete Footing:
Typical base dimensions approx. 12” x 12”. Exact
dimensions and capacities vary with manufacturer. Item
purchased at local building supply center.
Allowable Capacity
The allowable system compression capacity of the assembled 288 SmartJack
®
system is limited to the least
value of the component capacities used in the system assembly. The component capacities are listed in the
technical specifications section.
The allowable load applied to the SmartJack
®
system may be limited by the bearing capacity
of the existing soil. The well-compacted crushed stone or recycled concrete base is a proven
method to increase support for the higher bearing pressure condition immediately below the cast
aluminum base or the concrete footing, and then to absorb and distribute lower pressures to the
existing soils. Should settlement of the SmartJack
®
system occur, adjustments are made easily by
extending the all-thread rod.
The SmartJack
®
is designed to support axial compression loads only. The SmartJack
®
should
not be used in applications where the system is intended to resist lateral loads.
Corrosion Protection
The tube steel used for the SmartJack
®
is manufactured with a triple-layer, in-line galvanized coating.
This coating process consists of: (1) a uniform hot-dip zinc galvanizing layer; (2) an intermediate
conversion coating to inhibit the formation of white rust and enhance corrosion resistance; and (3) a
clear organic top coating to further enhance appearance and durability. The inside of the pier tube
also has a zinc-rich coating.
The cast aluminum base is far less susceptible to corrosion than the steel components that
surround it. There are, however, chlorides in some concrete that can be reactive with aluminum. It
is recommended that a 20 mil x 16” square inert membrane be placed under the aluminum base to
seperate it from recycled or poured concrete. Crushed limestone or other crushed stone alternatives
do not have similar considerations.
The remaining steel components of the SmartJack
®
system come standard as electrozinc plated per
ASTM B633.
Rev. 1/15/16