Case Studies

At ABC Anchors, we’re proud to see our screw piles and foundation systems in action across a wide range of projects—from small garden buildings to large-scale commercial and specialist installations. Below, you'll find a selection of case studies that showcase how our products and expertise have provided secure, sustainable, and efficient solutions in various settings.

Case Study: Concrete Slab Foundation Supported by 76R Rock Screwpiles

Project Overview:
ABC Anchors was tasked with providing a foundation solution for a concrete slab subjected to unfactored loadings of 70kN per pile position. The project required a robust, reliable piling method to cope with variable ground conditions and ensure long-term stability.

Ground Conditions:
Site investigation revealed made ground to a depth of 3 metres, consisting of silty gravel mixed with small brick rubble. From 4 metres onwards, the ground transitioned into sandy, dense clay with occasional fine gravel – offering a more competent stratum for pile termination.

Pile Design & Specification
To meet the structural requirements, ABC Anchors supplied 76R Rock Screwpiles in configurations of 8", 10", and 12" helix plates. Each pile comprised a 2-metre lead section and 2-metre extensions, driven to a depth of 4 metres to ensure anchorage in the stronger clay layer.

Pile Type: 76R Rock
Helices: 8", 10", 12"
Depth: 4 metres
Termination: Rebar cages for concrete slab connection

Installation
The screwpiles were installed using a 3-4T excavator fitted with an Autoguide 1600X Torquehead, ideal for tight access and efficient pile driving.

Torque Achieved: 6.25kNm per pile position
Equipment Used: 1600X Torquehead, 3–4T machine

Outcome
ABC Anchors successfully delivered a screw pile foundation system that provided a clean, fast, and effective alternative to traditional concrete foundations, even in challenging ground conditions. The use of rebar terminations allowed for seamless integration with the concrete slab, offering a robust and long-lasting solution.

Case Study: Screw Pile Foundations for Steel Beam Extension

Project Overview
ABC Anchors was engaged to support a new extension using steel beams, with piles designed to protrude from the ground and connect directly to the underside of the beam structure. The project demanded a high-load solution that could perform reliably in variable clay conditions.

Ground Conditions
Site testing revealed weak to firm clay throughout the installation depth, with Standard Penetration Test (SPT) N values ranging from 18 to 24—indicating medium-density soils suitable for helical pile installation.

Pile Design & Specification
To meet the required load capacity of 100kN per pile, ABC Anchors supplied a robust 76R Rock pile system with a multi-helix configuration and custom steel beam terminations.

Pile Type: 76R Rock
Helices: 8", 10", 12", 14"
Extensions: 1 metre + 2 metre
Termination: 76R I-Beam Cap for steel beam connection
Torque Achieved: 8.9kNm per pile

This configuration ensured secure anchorage and provided a clean, direct interface with the structural steelwork above ground.

Installation
The piles were installed using an Autoguide 1600X Torque head mounted to a 5-tonne excavator, offering precision and controlled torque delivery.

Machine Used: 5T Excavator
Torque Head: Autoguide 1600X
Torque Required: 8.9kNm per pile

Outcome
The project achieved a fast, efficient installation with no need for concrete curing or excavation. The use of above-ground I-beam terminations allowed the steel beams to sit directly on the pile heads, providing immediate load transfer and minimising site disruption.

Cost for Supply Only

Based on 8 Pile Positions down to 5-6M depth

£6500 - £8500 (ex VAT and Delivery)

Case Study: Conical Screw Pile Foundation for Small Wind Turbine

Project Overview
ABC Anchors provided the foundation solution for a small conical wind turbine, requiring a pile capable of withstanding not only vertical loads but also tension and lateral forces generated by wind. The challenge was to deliver stability in soft clay ground while using compact, lightweight installation equipment.

Ground Conditions
The site consisted of soft clay, which typically offers limited resistance to tension and uplift. This made it essential to select a pile type that could deliver secure anchorage despite the low shear strength of the soil.

Pile Design & Specification
To meet the required 25kN unfactored loadings and provide resistance against wind-induced tension forces, ABC Anchors supplied a 60R Rock Screwpile with a conical termination for improved performance in soft soils.

Pile Type: 60R Rock
Helices: 8", 10"
Configuration: Lead Section + 1M Conical
Special Feature: Conical termination to improve tension and uplift resistance
Load Capacity: 25kN unfactored + additional tension and wind loads

Installation
Despite the soft ground and challenging uplift requirements, the pile installation was completed using compact equipment—a 1.6T Bobcat fitted with a 500X Torque head. This allowed access to a remote or restricted site without compromising on installation quality.

Torque Head: Autoguide 500X
Machine Used: 1.6T Bobcat

Outcome
The conical pile solution provided a fast, stable, and cost-effective foundation for the wind turbine, with the specialised termination enhancing uplift resistance in weak soils. The lightweight, handily transported installation setup made this an ideal solution for rural or off-grid locations.

Cost for Supply Only

Based on a 3 pile positioned deign to 3 – 4 metres.

£1500 - £2500 (ex VAT and Delivery)