© 2014 Foundation Supportworks
®
,
Inc.
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p 325
APPENDIX 4D
SMARTJACK® SYSTEMS
Chapter 4
Miscellaneous Structural Support Products
Model 288 SmartJack
®
System
Technical Specifications
SJ288TP (Top Plate):
1
” x 4.00” x 4.00” ASTM A 36 plate with
Ø
1.500” x 0.250” wall x 1.375” long ASTM A53
Grade B confining ring.
SJ100ATR (All-Thread Rod):
Ø
1” x 8” long ASTM A 108 Grade 1018 all-thread rod
with welded heavy hex nut. Yield strength = 70 ksi (min.),
tensile strength = 85 ksi (min.).
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.).
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.).
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.
SJFTG (Precast Concrete Footing):
Typical base dimensions approx. 12” x 12”. Exact
dimensions vary with manufacturer. Item purchased at local
building supply center.
Typical Crawlspace Detail
Note:
Concrete footing design (thickness, reinforcement
and compressive strength) by others.
Allowable Capacity
The allowable systemcapacity of the assembled 288 SmartJack steel components is 18 kips (18,000 pounds).
While the rigidity and strength of the SmartJack components benefit installation and overall product
stability, the allowable load applied to the SmartJack system will nearly always 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 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.
