Construction Earth Screw Pile

Construction earth screw pile design is based on standard structural and geotechnical principles. Construction earth screw pile designers typically use their own design software which has been developed through field testing of differing compression pile and tension anchor configurations in various soil profiles.
Product description

Product description


      Construction earth screw pile design is based on standard structural and geotechnical principles. Construction earth screw pile designers typically use their own design software which has been developed through field testing of differing compression pile and tension anchor configurations in various soil profiles. Corrosion is addressed based on extended field trials, combined with worldwide databases on steel in ground corrosion.

Compression Loading of Construction earth screw pile in CLAY
Under both compression and tension loading of deep Screw-Piles and Helical Anchors in clay, the ultimate capacity is obtained using the Total Stress Analysis (TSA) and undrained shear strength. In saturated clays with φ’ = 0 and c = su the bearing capacity equation is often give as:

QH = AH(Nc)su     [1.1]

where:
QH = Ultimate Bearing Capacity in Compression
su = undrained shear strength
Nc = Bearing Capacity Factor for clays with φ’ = 0; for round plates NC = 6.0(1 + 0.2D/B) < 9
AH = Effective area of the helical plate For deep installations, NC = 9, which gives: QH = AH(9)(su)

For deep installations, Nc = 9, which gives:

QH = AH(9)(su)

Compression Loading of Construction earth screw pile in SAND
For deep installations of single-helix Screw-Piles and Helical Anchors in sand the ultimate capacity is obtained using the Effective Stress Analysis (ESA) from:

QH = AH(σ’vo Nq + 0.5γ’BNγ)

where:

σ’vo = vertical effective stress at the depth (D) of the helix = γ’D
Nq and Nγ = bearing capacity factors
B = Diameter of the helical plate
γ’ = effective unit weight of the soil

The bearing capacity factor Nq is usually obtained from values used for determining the end bearing capacity for deep pile foundations. There have been a number of different recommendations for estimating Nq which are available in most foundation engineering textbooks, e.g., Fang & Winterkorn 1983:

Nq = 0.5 (12 x φ’)^(φ’/54)

Because the area of the plate is usually small, the contribution of the “width” term (0.5γ’BNγ) to ultimate capacity is also very small and the width term is often ignored. This reduces to

QH = AH(σ’vo Nq)

    Construction earth screw pile and micropile software is intended for calculation of the bearing capacity of the foundation terrain of a pile or micropile bearing loads in whatever distribution (moment, normal force, shear). Structural calculation yielding dimensions of longitudinal steel struts, interval and size of rings is also performed.

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