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p 259
APPENDIX 3A
BRACKET SPECIFICATIONS AND CAPACITIES
Chapter 3
Hydraulically-Driven Push Piers
Bracket:
Weldment manufactured from
1
”,
3/8
”,
and
1
” ASTM A36 plate.
Pier Tube:
Ø
2.875” x 0.165” wall x 36” long
Triple-coated in-line galvanized
ASTM A500 Grade C
Yield strength = 50 ksi (min)
Tensile strength = 55 ksi (min)
Pier Tube Coupler:
Ø
2.250” x 0.180” wall x 6” long
Pier Starter Tube:
Pier tube section with
Ø
3.375” friction
reduction collar pressed around leading end.
FS288BFM Bracket Specifications and Capacities
when used with the PP288 Push Pier System
Allowable Bracket Capacity
(4,5,6,9)
R
n
/Ω
with Wedge
Anchors
(7)
(kips)
with
Adhesive
Anchors
(8)
(kips)
Plain
22.0
31.0
Plain Corroded
(1)
17.0
24.0
Grout Filled Corroded
(1)
19.3
27.1
Maximum Drive Force
During Installation
(9)
44.2
60.0
(1)
Corroded capacities include a 50-year scheduled sacrificial loss in thickness per ICC-ES AC406. Grout filled piers consider a loss in thickness
at the outside diameter only.
(2)
Hot-dip galvanized coating in accordance with ASTM A123.
(3)
Optional hardware utilizes similar sized contour (coil) thread made from AISI 1045, tensile strength = 120 ksi. Slightly lower tensile strength
material does not govern the listed capacities.
(4)
Brackets shall be used for support of structures that are considered to be fixed from translation. Structures that are not fixed from translation
shall be braced in some manner prior to installing retrofit brackets systems.
(5)
Allowable compression capacities consider continuous lateral soil confinement in soils with SPT blow counts ≥ 4. Piers with exposed unbraced
lengths or piers placed in weaker or fluid soils should be evaluated on a case by case basis by the project engineer.
(6)
Bracket is strictly intended to be mounted to poured concrete structures. Bracket should never be mounted to CMU concrete block.
Anchorage assumes a minimum concrete compressive strength (f’c) of 2,500 psi and a minimum concrete thickness of 8”. Local concrete
bending and other local design checks should be evaluated on a case by case basis by the project engineer.
(7)
When the bracket is mounted with wedge anchors, the bracket shall be located with a minimum distance of 6” from the edge of the bracket to
any concrete edge. Wedge anchors require the use of a
Ø
3/4
” drill bit and a minimum embedment depth of 5”. Wedge anchors shall be installed
to a torque of 150 ft-lbs.
(8)
When the bracket is mounted with adhesive anchors, the bracket shall be located with a minimum distance of 9” from the edge of the bracket
to any concrete edge. Wedge anchors require the use of a
Ø
13/16
” drill bit and a minimum embedment depth of 5.50”. Adhesive anchors shall
be tightened to a snug tight condition after sufficient curing time.
(9)
Push Piers shall be installed with a driving force exceeding the required allowable service load by a sufficient factor of safety (FOS). FOS is
most commonly between 1.5 and 2.0, although a higher or lower FOS may be considered at the discretion of the pier designer or as dictated
by local code or project requirements.
External Sleeve:
Ø
3.500” x 0.216” wall x 30” or 48” long with
welded collar or trumpet flare at one end.
ASTM A500 Grade B or C
Yield strength = 50 ksi (min)
Tensile strength = 62 ksi (min)
Cap Plate:
1” x 5.00” x 9.00” ASTM A572 Grade 50
with confining ring welded to one side.
Bracket Hardware
(3)
:
(2) -
Ø
3/4
”x 16” long all-thread rod
Grade B7, tensile strength = 125 ksi (min)
Electrozinc plated per ASTM B633
Bracket Finish:
Available plain or hot-dip galvanized
(2)
Concrete Anchorage
(7)
(Option 1):
(8) -
Ø
3/4” x 7” Simpson Wedge-All
Mechanically galvanized per ASTM B695)
Concrete Anchorage
(8)
(Option 2):
Adhesive = Simpson AT
Quantity = approximately 1.25 oz per hole
(8) -
Ø
3/4
” x 7” long all-thread rod
Grade B7, tensile strength = 125 ksi (min)
Electrozinc plated per ASTM B633