Underpinning a Failed Foundation

In July, we were approached by Peter at Foundation Solutions Ireland whose client was building a Residential Log Cabin as an extension to an existing cottage. They were experiencing some issues with a previous extension and contacted Peter to see if he could help.

"The problem was an existing extension was sinking slowly causing structural cracks so they asked us for a possible solution with our foundation groundscrews. The site is old shallow bog with 1.2m of bog soil on 1m of normal sandy soil and then in to the harder subsoil where we hit a rock base."

Peter found us through our website and we helped devise the best solution. Groundscrews would not have been suitable as they could not be installed deep enough into the harder ground to ensure no further movement on the property.

Our underpinning solution is ideal for briefs like this as it causes minimal disruption and can often be hand installed which negates the need for an excavator. Subsiding properties are often due to insufficient foundations or shallow footings on ground conditions such as clay and, in this case, bog land.

"We contacted ABC Anchors who were able to supply us the machinery and large helix screw anchors. The support plates reached the required torque at between 2m-3m depth and the extension is now supported fully to prevent any further movement."

Screw piles have many benefits. If you are experiencing problems with a subsiding building where our underpinning solution may be suitable, or you have any other screw pile enquiries, please don't hesitate to get in contact with us.

Equipment Hire

Screw Pile Installation Equipment Hire

ABC Anchors offer a range of Autoguide’s screw pile specific torque heads for hire. All torque heads come equipped with torque gauge for driving screw piles to the required installation torque.

Installers for 60R Piles

400H Hand-held Anchor Drive

Our 400H portable anchor installer is available with or without the hydraulic power pack and is ideal for use in confined spaces or areas of limited access. We hire this machine for installing our 60R screw piles, to accommodate loads up to 48kN.

500X / XG Torque Head

We have a range of mounting brackets to attach the 500X to excavators from 1.5 to 6 tonnes. This allows anchor installation at a wide range of angles. When access is not an issue, installation using the 500X instead of our handheld equipment allows our 60R screw piles to accept loads up to 60kN.

400H
400H

500X / XG
500X / XG

Installers for 76R Piles

650H Hand-held Anchor Drive

The 650H portable anchor installer is available with or without the hydraulic power pack and is ideal for use in areas of limited access much like the 400H. This larger handheld machine can accommodate loads up to 73kN with our 76R screw piles.

1600X

The 1600X is the torque head of choice for installing our 76R screw piles, accepting loads up to 180kN. It can be mounted using a range of brackets to excavators from 4 to 7 tonnes.

650H
650H

1600X
1600X

Installers for 89R Piles

2500X

The 2500X is an excavator mounted torque head for use with 89R screw piles. Our largest pile can accept loads up to 250kN and must be installed using an excavator from 4 to 10 tonnes. The torque head is shown here with the Gimbal bracket, which allows installation when head room or the excavator boom arm length is an issue; mounting on the side of the head rather than the top.

2500X / XG
2500X / XG

Soil Test Probe

The soil test probe is used to determine the soil conditions on site where no soil investigation information is available. Torque readings are recorded at 250mm intervals to provide an indication of the properties of the soil. These readings can be easily correlated against SPT value charts to determine the soil type and it’s suitability for accepting screw piles.

As a general rule, screw piles are not designed to penetrate solid bedrock, nor are they able to penetrate through obstructions such as boulders or buried concrete. However most other soil types are acceptable.

Being hand driven or with a high torque battery drill, the data produced allows the engineer to design the most suitable pile configuration for the calculated loads.

On many small projects use of this equipment can result in overall price reduction (especially compared to a full ground investigation), with a high level of confidence in the finished result.

Soil Test Probe
Soil Test Probe