Concrete Slab Solution for Marginal or Expansive Ground Conditions by StopDigging!

Concrete Slab Solution for Marginal or Expansive Ground Conditions

StopDigging!

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Description

Groundscrew piling is a highly efficient way to mitigate poor ground conditions. Underslab Piling is used as a ground improvement method, combining a standard 'good ground' raft slab design with perimeter and/or point load piling. This removes the need to excavate poor ground and reinstate engineered fill, reducing cost and waste, and therefore speeding up the construction programme.

Key Features

Eliminates expensive cantilever slab design, or large quantities of concrete for deep edge thickening
Groundscrews extend beyond the influence of the shrink / swell zone for expansive ground and support the slab edge
Groundscrews can extend down through ground with poor bearing capacity, or non-engineered fill into dense, stable zones below
Can provide underslab bridging to allow construction over deep buried services like water pipes
Groundscrews can provide slab edge piling close to existing retaining walls removing the need for alteration or improvement work to existing retaining by allowing the load to be transferred below the zone of influence
Groundscrew underslab piling provides a low impact, zero waste solution to eliminate removal of sub optimal soils from site

Scope of Use

Underslab piling as a ground improvement method for all types of structures. These include residential housing and commercial buildings with pile design loads of up to 150kN.

CodeMark certification simply calls for individual pile design loads and positions to be identified by the project structural engineer or slab designer on the slab layout plan. See CodeMark Certificate CMSNZ70132 for full Conditions and Limitations of Use.

StopDigging! provide on site static pile testing to verify what size and length of pile is required to achieve the necessary design loads. Testing is performed in accordance with the recommendations of the geotechnical report for minimum embedment depths.

This allows formal fixed price quotations after testing has been completed, and eliminates any potential for onsite variations during installation/construction.

Limitations on Use

This application is specified to suit the site and structural requirements so a geotechnical report is required to determine the limitations of the ground conditions.

Statement of Building Code Compliance

The StopDigging groundscrew system is certified with a CodeMark certificate and complies or contributes to (where used as part of a system) the following performance clauses of the New Zealand Building Code:

Clause B2 – DURABILITY Performance B2.3.1
B1 Structure: B1.3.1, B1.3.2, B1.3.3 (b, f, g, h), B1.3.4 B2 Durability: B2.3.1 (a), B2.3.2 (a)
F2 Hazardous building materials: F2.3.1

See CodeMark Certificate CMNZ10132 for full information.

In-Service History

Screw piles are not a new concept, they were first used in the 1850s. StopDigging! (a Swedish company, started in the early 2000s) moved into the New Zealand market in 2017 and have completed thousands of projects throughout the country.