Groundscrew Foundations – Basic design pathway

GROUNDSCREW FOUNDATIONS

Design loads

Individual Pile demand loads are needed in kN for compressive, tensile and lateral loads. Typically all groundscrews are cantilever piles and share the lateral bracing demand evenly through all piles in the design. 20 bracing units = 1kN. Diagonal bracing and / or pile extensions (timber or steel posts) are available for multiple design options for high levels above ground or sloping building platforms.

Groundscrews can be used as a spot footing for post or ‘foot’ mounting. Groundscrews are a superior option for use in expansive ground conditions, especially in conjunction with concrete slab foundations. Grouped Groundscrew arrangements are available to achieve high point load. Segmental, extendable Groundscrews are available for deep ground penetration for bridging and zone of influence requirements.

01

Are you building to NZ3604?

YES

Use span tables from 3604 for sizing of timber bearers / joists. This will determine pile quantity for the subfloor design.

Next Step: 02

NO

Specific Engineering Design required. (SED)

Next Step: 04
02

Is the site classed as ‘Good Ground’ 300kPA?

YES

Use StopDigging Groundscrew data sheet for pile load bearing capacities.

Next Step: 03

NO

Specific Engineering Design required. (SED)

Next Step: 04
03

Height above ground to underside of bearer will dictate ground screw length

04

SED to determine design loads. Geotechnical input for design parameters. PS1 from CPEng.

Next Step: 05
05

StopDigging undertake inground static pile testing to confirm load bearing capacity and length of Groundscrew required for site specific ground conditions. This is a formal verification method for Building Code compliance.

Next Step: 06
06

StopDigging provide PS3 on completion of installation. CPEng to provide PS4.

OUR SCREWS

SCREWS FOR EVERY OCCASION

Adapter, pipe, post and beam – we have four basic models of screws with different brackets, lengths and dimensions.

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