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Micropile Remedial Repair Underpinning Brackets
Williams Form Engineering Corp. offers underpinning brackets for compression foundation remediation, tension/compression foundation remediation and floorslab remediation applications. Compression foundation remediation and tension/compression foundation remediation brackets are offered in three sizes ranging from 20 kip to 63 kip capacities where the bracket is attached to a grouted micropile casing in medium stiff soils (N>4). The unbraced length of micropile is minimum 5’; so per section 1810.2.1 of IBC, a casing length of min 6’ is required to resist buckling and bending stresses. Brackets can be used in soft soils (N<4), however, the capacity may be reduced as the unbraced length of the micropile would be greatly increased in weaker soils. Please consult with a professional engineer to determine allowable working design load. underpinning_bracket
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Compression Underpinning Bracket (C)
  • Supports and raises existing foundations via connection to grouted micropile casing

Bracket
Number
Bracket
Capacity
Bracket Sleeve Bracket Seat Bracket Casing
OD
Wall
Thickness

Bearing
Area

OD Wall
Thickness
Standard
Length
Yield
Stress
WMS-MPB-20-C
20 kips
(88.9 kN)
3-1/2"
(88.9 mm)
1/4"
(6.35 mm)
90 in2
(580 cm2)
2-7/8"
(73 mm)
0.216"
(5.49 mm)
6"
(1.83 m)
65 KSI
(448 Mpa)
WMS-MPB-40-C

40 kips
(178 kN)

5-9/16"
(141 mm)
3/8"
(9.53 mm)
90 in2
(580 cm2)
4-1/2"
(114 mm)
0.438"
(11.13 mm)
6"
(1.83 m)

65 KSI
(448 Mpa)

WMS-MPB-63-C

63 kips
(280 kN)

6-5/8"
(168 mm)
0.432"
(10.97 mm)
90 in2
(580 cm2
)
5-9/16"
(141 mm)
0.258"
(6.55 mm)
6"
(1.83 m)

36 KSI
(248 Mpa)

Tension/Compression Underpinning Bracket (TC)
  • Supports and raises existing foundations via connection to grouted micropile casing.
  • In tension, bracket requires a postive connection to the foundation through four 1” diameter concrete anchors bolts designed to have adequate shear capacity from seismic and wind loads. To complete the tension load path, the bracket must be positively connected to the micopile casing by field welding the bracket sleeve to the mircropile casing or by attaching shear bolts from the bracket sleeve through the micropile casing.
Bracket
Number
Bracket
Capacity
Bracket Sleeve Bracket Seat Bracket Casing
OD
Wall
Thickness

Bearing
Area

OD Wall
Thickness
Standard
Length
Yield
Stress
WMS-MPB-20-TC
20 kips
(88.9 kN)
3-1/2"
(88.9 mm)
1/4"
(6.35 mm)
90 in2
(580 cm2)
2-7/8"
(73 mm)
0.216"
(5.49 mm)
6"
(1.83 m)
65 KSI
(448 Mpa)
WMS-MPB-40-TC

40 kips
(178 kN)

5-9/16"
(141 mm)
3/8"
(9.53 mm)
90 in2
(580 cm2)
4-1/2"
(114 mm)
0.438"
(11.13 mm)
6"
(1.83 m)

65 KSI
(448 Mpa)

WMS-MPB-63-TC

63 kips
(280 kN)

6-5/8"
(168 mm)
0.432"
(10.97 mm)
90 in2
(580 cm2
)
5-9/16"
(141 mm)
0.258"
(6.55 mm)
6"
(1.83 m)

36 KSI
(248 Mpa)

Floor Slab Underpinning Bracket (FS)
  • Capacity of 11.7 Kips to support and raise existing slab-on grade concrete supported by grouted micropile.
  • Bracket should be installed through a 10” diameter hole in the existing floor slab.
  • Casing should be set at a sufficient height above the bracket sleeve such that the fastening nuts and support strap are below the finished floor elevation after the slab has been raised.
  • The spacing of the floor slab micropiles shall be the lesser of the slab punching shear capacity and the flexural strength of the floor slab to span between the piles or the bracket capacity. Consult with a professional engineer to determine the maximum spacing of the micropiles.
  • Excavation under slab required.
Bracket
Number
Bracket
Capacity
Bracket Sleeve Bracket Seat Bracket Casing
OD
Wall
Thickness

Bearing
Area

OD Wall
Thickness
Standard
Length
Yield
Stress
WMS-MPB-11.7-FS
11.7 kips
(52 kN)
3-1/2"
(88.9 mm)
1/4"
(6.35 mm)
40 in2
(258 cm2)
2-7/8"
(73 mm)
0.216"
(5.49 mm)
6"
(1.83 m)
65 KSI
(448 Mpa)
k
underpinning_bracket
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