[EAZET] The ideal steel screw herical pile installing system in Japan

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HOME > Bearing Capacity formula

Bearing Capacity formula

EAZET pile system has certification from Japanese "Minister of Land, Infrastructure and Transport" to decide itsbearing capacity from the average N value of Standard Penetration Test.

1. Bearing capacity determined by the ground

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2. Application to the soil layer

  • 1. Application to the soil layer
  • (1) We have individual certification to each sand and clay layer.

    (2) Application of the pile diameter

    Sand layer(including gravel) 114.3 to 355.6
    Clay layer 114.3 to 267.4
  • 2. Maximum pile installing length
  • 114.3 139.8 165.2 190.7 216.3 267.4 318.5 355.6
    Sand layer (including gravel) 14.8 18.1 21.4 24.7 28.1 34.7 36.7 41.0
    Clay laye 12.2 14.9 17.6 20.3 23.1 28.8
  • 3. The size of building applicable by EAZET pile system
  • (1) The building which its floor area is under 100,000m²

Chart of EAZET pile bearing capacity determined by the ground (kN)

Pile shaft diameter Dp (mm) Pile spiral tip diameter Dw (mm) Efficient Area As (m²) Average N value at the tip of the pile
15 20 30 40 50
114.3 250 0.02454 36 49 73 98 122
300 0.03634 53 70 106 141 176
139.8 300 0.03534 53 70 106 141 176
350 0.04811 72 96 144 192 240
165.2 350 0.04811 72 96 144 192 240
450 0.07952 119 159 238 318 397
190.7 400 0.06283 94 125 188 251 314
500 0.09817 147 196 294 392 490
216.3 470 0.08675 130 173 260 346 433
550 0.11879 178 237 356 475 593
600 0.14137 212 282 424 565 706
267.4 500 0.09817 147 196 294 392 490
580 0.1321 198 264 396 528 660
650 0.16592 248 331 497 663 829
800 0.25133 376 502 753
318.5 600 0.14137 212 282 424 565 706
750 0.22089 331 441 662 883 1104
355.6 700 0.19242 288 384 577 769 962
800 0.25133 376 502 753 1005 1256
Bearing capacity from the skin friction of the pile is not included.

Bearing capacity determined by the steel pile shaft