Chance Technical Design Manual

HIGH COMPRESSION STRENGTH WITH GROUTFORCE™ PILES IN SOFT SOIL

The following tables provide the nominal, LRFD design, and ASD allowable compression strengths of GroutForce piles with various diameter grout shafts in soft soils. The strengths listed are based on an unsupported length of 10 feet (3 meters) with either a fixed or pinned end condition at the pile head. The grout column diameters listed reflect the results in various soil conditions and are controlled by the casing diameter on the displacement assemblies. In soft or loose conditions, the grout

column can exceed the diameter of the displacement assembly casing. Each table includes the compression strengths of shafts without external grout for comparison. Per the International Building Code (IBC) 2024 Section 1810.2.1, the depth to fixity of piles driven into soft ground can be con sidered fixed and laterally supported at 10 feet below ground surface.

DRAWINGS & RATINGS NOMINAL, LRFD DESIGN, AND ASD ALLOWABLE COMPRESSION STRENGTHS OF GROUTFORCE PILES, TYPE SS225 CENTRAL SHAFTS IN SOFT SOIL 1,2,3

NOMINAL, LRFD DESIGN, AND ASD ALLOWABLE COMPRESSION STRENGTHS (kip) {kN} Soft Soil Pinned Fixed Nominal Design Allowable Nominal Design Allowable

Grout Column Diameter

No Grout

70.9 {315}

63.8 {284}

42.5 {189}

139.0 {618}

125.1 {556}

83.2 {370}

8.63”

359.9 {1600}

269.2 {1200}

179.9 {800}

487.7 {2169}

365.7 {1259}

243.8 {1084}

NOMINAL, LRFD DESIGN, AND ASD ALLOWABLE COMPRESSION STRENGTHS OF GROUTFORCE PILES, TYPE RS4500.337 CENTRAL SHAFTS IN SOFT SOIL 1,2,3 NOMINAL, LRFD DESIGN, AND ASD ALLOWABLE COMPRESSION STRENGTHS (kip) {kN} Soft Soil Pinned Fixed Nominal Design Allowable Nominal Design Allowable Grout Column Diameter

PLAIN EXTENSION

No Grout

156.30 {700} 140.67 {630}

93.59 {419}

175.30 {785}

157.7 {707}

104.9 {470}

Grout Inside

190.46 {853}

142.84 {640}

95.23 {426}

219.25 {982}

164.4 {737}

109.6 {491}

EXTENSION DISPLACEMENT PLATE

8.63”

332.5 {1478} 249.3 {1108}

166.2 {739} 376.9 {1543.3} 282.6 {1257}

188.4 {838}

For SI: 1 kip = 4.448 kN. 1 Refer to Section 4.1.3 of ESR-2794 for descriptions of fixed condition, pinned condition, soft soil.

EXTENSION DISPLACEMENT CASING

2 Strength ratings are based on a design corrosion level of 50-years and presume the supported structure is braced in accordance with IBC Section 1808.2.5, and the lead section with which the extension is used will provide sufficient helix capacity to develop the full shaft capacity. 3 Column length to “fixity” of shaft in soil = 10 feet (3 meters)

GROUTFORCE™ PILE THEORETICAL GROUT VOLUME PER FT (M), TABLE 7-9 PILE SHAFT DIAMETER in. (mm) GROUT COLUMN DIAMETER in. (mm) GROUT VOLUME ft 3 /ft (m 3 /m)

LEAD DISPLACEMENT CASING

2.25 (57)

8.625 (219.1)

0.371 (0.034)

4.5 (114) I.D. Grouted

8.625 (219.1)

0.375 (0.035)

HELIX

4.5 (114) I.D. Open

8.625 (219.1)

0.295 (0.027)

6.63 (168) I.D. Grouted

12.75 (323.8)

0.848 (0.079)

GROUTFORCE PILE ASSEMBLY, FIGURE 7-54

6.63 (168) I.D. Open

12.75 (323.8)

0.647 (0.060)

Page 7-98 | Hubbell Power Systems, Inc. | All Rights Reserved | Copyright © 2025