ScrewFast Site Investigations
The Site Investigation Division is a specialist geotechnical department which operates from the Home Counties and covers the whole of the UK. We are based in St Albans where we have one site office and yard housing the drilling equipment, vans, trucks and trailers.
We are very experienced in working in limited and restricted areas and for many different customer requirements including:
- mast sites;
- railway;
- highway;
- residential;
- commercial building contractors
All our technicians are PTS and CSCS card holders. We are also Link-Up approved.
Site Investigations
Boreholes/Probes
We have the ability to carry out boreholes and dynamic probes with a variety of apparatus including a Dando Terrier Rig and other Geotool equipment.
Trial Pits
Insitu Testing
- Resistivity Testing
- Shear Vane
- Pocket Penetrometer
Piezometer Installation
Concrete Coring
Laboratory/Chemical Soil Testing
Hire Service
- Dynamic Probe Light
- Resistivity Testing Kit
Our Sevice
ScrewFast Site Investigations provide all types of Ground Investigation services,
- Boreholes and Dynamic Probing, using a number of types of equipment
- Resistivity testing
- Preliminary Desk Study
- Walkover surveys
- Geotechnical and Chemical Testing
- Trial Pit logging
- We can provide Factual Reports and Interpretive Report
ScrewFast Foundations Site Investigations
All our Drillers are PTS certified and hold current CSCS Experienced Worker cards in Land Drilling. We have a friendly atmosphere and strive to treat every enquiry, big or small with the same professional manner and aim to deliver first rate performance to all our clients.
All Site Investigation work is carried out to the relevant British Standards BS 5930:1999 (A2 2010) to ensure accurate and reliable results.
Our Equipment
Cable Percussive
Our Drillers are BDA qualified to operate the Cable Percussive rig capable of SPT and U100 tests to depths of up to 50m below ground level. This type of drilling rig is commonly used on Greenfield or large open sites due to its size and manoeuvrability. It is an excellent piece of equipment for retrieving undisturbed samples and gaining SPT results to depths that cannot be achieved by smaller equipment.
Dando Terrier 
The Terrier Rig is a very versatile drilling rig that operates on rubber tracks allowing it to be moved into position, sometimes over long distances, it comes self contained and can carry its own equipment, reducing labour times on site. The Terrier can give excellent SPT results to BS EN ISO 22476-3 2005 and its percussive sampling capabilities mean that it can be utilised in a number of ways. The Terrier can also utilise casing for when unstable ground is encountered. This type of equipment can be used in a Railway, Highway or Greenfield setting. As well as SPT results the Terrier can also utilise Dynamic Probe Super Heavy for sites where soil strength readings are needed to greater depths.
Geotool LMSR-VK
The Geotool LMSR-VK is smaller percussive rig with great limited access capabilities. Due to its light weight (125kg) and its folding mast, it can be manoeuvred into all kinds of locations, including rail and highway and hard to access residential plots. It gives Dynamic Probe Heavy results to BS EN ISO 22476-2 2005 and window sampling capabilities.
Geotool DPP
The Geotool Dynamic Probe Light is a very portable and robust piece of equipment, capable of being taken virtually anywhere, and giving Dynamic Probe Light results to BS EN ISO 22476-2 2005 that can regularly achieve 6-8m below ground level. This has been primarily used on rail locations with very limited access, as other equipment cannot safely get to the sites. This is a very time efficient test and can also be used to give an overall view of large sites quickly.
