Chance Technical Design Manual

P2, which can then be compared to P4 to see which will control the design. The table is broken down by concrete strength, soil type and end condition. For example, a Type SS175 helical pile in firm soil & fixed end condition with a new construction cap embedded in 2500 psi concrete has an ASD allowable compression strength of 52.7 kip based on the strength of the cap (P1). The P4 geotechni cal allowable capacity of 52.5 kip is basically the same. But if the soil is soft with the same fixed end condition, the ASD al lowable compression strength is 30.2 kip based on the shaft

strength; which is less than the P4 geotechnical allowable ca pacity of 52.5 kip. Again, the difference is the depth to fixity, which is 5’-0 in firm soils and 10’-0 in soft soils. Table C-7, repeated from Section 7 of the TDM, lists the P1 (re medial repair bracket) and P2 (shaft) ASD allowable strengths for Type SS175 helical piles. It is used to easily determine P1 and P2, which can then be compared to P4 to see which will control the design. The table is broken down by concrete strength and soil type. Chance Remedial Repair Brackets provide fixed end condition at the bracket-shaft connection.

HELICAL PILES & ANCHORS

TABLE C-5 - SS175 - P2 SHAFT COMPRESSION STRENGTH AND P3 HELIX STRENGTH IN FIRM OR SOFT SOIL

ASD Allowable Axial Compression Strength, kip (kN) Firm Soil Soft Soil Fixed Pinned Fixed Pinned

Section Type & Helix Count

Lead, Single Helix Lead, Single 12” Helix Lead, Single 14” Helix Lead, 2-Helix 8”-10” Lead, 2-Helix 10”-12” Lead, 2-Helix 12”-14” Lead, 2-Helix 14”-14”

30.2 (134.3) 28.7 (127.7) 25.9 (115.2)

See Helix Strength Table Above

See Helix Strength Table Above

15.4 (68.5)

94.7 (421.2) 61.7 (274.5)

61.8 (274.9)

61.7 (274.5)

30.2 (134.3) 15.4 (68.5)

54.6 (242.9) 54.6 (242.9) 51.8 (230.4) 51.8 (230.4)

Lead, Multi-Helix

98.4 (437.7) 61.7 (274.5) 30.2 (134.3) 15.4 (68.5) 98.4 (437.7) 61.7 (274.5) 30.2 (134.3) 15.4 (68.5)

Extension

TABLE C-6 - SS175 – P1 PILE CAP COMPRESSION STRENGTH AND P2 SHAFT COMPRESSION STRENGTH IN FIRM AND SOFT SOILS ASD ALLOWABLE STRENGTHS OF NEW CONSTRUCTION PILE CAPS LOADED IN COMPRESSION 1,2,3,4,5,6,7,8

ASD Allowable Compression Strength kip (kN)

2500 psi Concrete 6

3000 psi Concrete 6

4000 psi Concrete 6

Catalog Number

Pile Model

Firm Soil Soft Soil Pinned Fixed Pinned Fixed Pinned Fixed Pinned Fixed Pinned Fixed Pinned Fixed Soft Soil Firm Soil Soft Soil Firm Soil

32.6 (145) 52.7 (234) 32.6 (145) 52.7 (234)

33.7 (150) 52.7 (234) 33.7 (150) 52.7 (234)

32.6 (145) 60.0 (267) 32.6 (145) 60.0 (267)

34.6 (154) 60.0 (267) 34.6 (154) 60.0 (267)

32.6 (145) 60.0 (267) 32.6 (145) 60.0 (267)

36.4 (162) 60.0 (267) 36.4 (162) 60.0 (267)

C1500458(G)

SS5

8.1 (36) 16.0 (71)

8.1 (36) 16.0 (71)

8.1 (36) 16.0 (71)

15.4 (69)

30.2 (134)

15.4 (69)

30.2 (134)

15.4 (69)

30.2 (134)

C1500459(G)

SS175

C1500465(G)

SS5

8.1 (36) 16.0 (71)

8.1 (36) 16.0 (71)

8.1 (36) 16.0 (71)

15.4 (69)

30.2 (134)

15.4 (69)

30.2 (134)

15.4 (69)

30.2 (134)

C1500467(G)

SS175

TABLE C-7 - SS175 – P1 REPAIR BRACKET COMPRESSION STRENGTH AND P2 SHAFT COMPRESSION STRENGTH IN FIRM AND SOFT SOILS ASD ALLOWABLE STRENGTHS OF C1500299 REMEDIAL REPAIR BRACKETS & HELICAL PILES 1,2,3,4,5

ASD Allowable Strength in Axial Compression kip (kN)

Bracket Catalog Number

T-Pipe Catalog Number

Pile Model

2500 psi Concrete 5

3000 psi Concrete 5

4000 psi Concrete 5

Firm Soil 34.7 (154)

Soft Soil 27.7 (123)

Firm Soil 39.3 (175)

Soft Soil 27.7 (123)

Firm Soil 47.9 (213)

Soft Soil 30.2 (134)

C1500299

C1500488

SS175

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