Tips from the professionals

Six important things that you should bear in mind when installing screw foundations

Tips from the professionals

Six important things that you should bear in mind when installing screw foundations

Foundations made with ground screws offer many advantages and have just the same load-bearing capacity and security as classic concrete foundations. In order to ensure this, a proper installation is essential. Here, we’ll give you an overview of the six most important things that need to be kept in mind with the installation of ground screws.

1. The subsoil check

Alongside the clarification about the subsoil with regards to its composition and load-bearing capacity, it’s also very important to check whether there are any kind of pipelines running under the construction site before the foundation installation begins. This means that you can avoid unintentionally damaging gas, electricity, water or telecommunication lines, which would not only be an expensive mistake but also a very dangerous one. Another important point: some construction sites are located on former munitions factories or in areas that were targeted by bomb attacks during the First and Second World Wars. It must absolutely be ensured that there are no unexploded bombs on the site as this can pose a risk to life.    

2. Preliminary drilling makes the driving in easier

It’s recommended that you perform a preliminary drilling at each of the ground screw installation points to ensure high levels of precision and to make the installation more efficient. These should be significantly smaller in diameter than the foundation that you will be installing. The drilling can be done either partially or cover the whole length. It should be done either with the help of a probing spike or by hand with a traditional impact drill. (By probing spike, we mean a displacer in the shape of a thin, very robust screw.) As well as increasing the precision, the process also helps the installer to identify any hard layers or obstacles in the substrate. This means that any damage to the foundations or any “slipping” can be avoided. This process allows for a more precise and smoother driving in of the ground screws with a lower torque thanks to the pre-drilled hole.

3. Experience is an advantage

When it comes to the professional installation of ground screws, a certain level of experience is needed in order to drive in the screws with the necessary balance. Applying too much clamping pressure can destroy the drilled hole, and applying too little pressure can result in the screw driver “rotating empty”. In addition, it’s important to drive in the screws evenly, as with each rotation the ground screw must penetrate the ground in accordance with the thread pitch. Therefore, you need to make sure that you always keep an eye on the torque and the soil. If earth is moved upwards, it can significantly reduce the load-bearing capacity of the foundations as it may cause slipping and this may then mean that there is not sufficient surface friction between the pipe and soil. Any “burrowing” into the soil must therefore be avoided at all costs.  

4. Keep an eye on the spirit level

Depending on the application, you have to work very precisely. This means that the installation tolerances must be kept extremely low. This is necessary as then the load bearing points of the structure can later be exactly adjusted to the foundations. In addition, you must always keep an eye on the spirit level in order to ensure a perpendicular driving in. Tilting and too high installation tolerances can lead to an incorrect and unfavourable loading of the ground screws, which may in turn cause other problems, such as the bending of the ground screws, for example. This can lead to a decrease in the load-bearing capacity of the foundations.   

5. Torque documentation creates acceptance

You should document the torque during the installation of the individual ground screws, even if no evidence is required. These values can be compared with the results of the load-bearing test which – if they match – not only confirms the quality of the installation but also increases the acceptance of the solution by everyone involved in the project. In most cases, the documentation can only be done manually. But there are also some ground screw drivers which automatically document the torque with the help of a torque kit, for example the KRD 30 and KRL from KRINNER.   

6. Use the right machine

Last but not least, it is of course important to choose the right ground screw driver to ensure a proper installation. Here, there are a variety of different designs available to choose from. It may be an electric manual ground screw driver, a hydraulic excavator add-on or a drill-guided installation device which is available both as a self-driving caterpillar and an excavator add-on. Each machine has its own application-oriented, specific advantages which means that they can cover a wide range of application possibilities. For example, if precision is important for your project, a drill-guided machine is recommended, but with narrow and small construction sites, a manual ground screw driver is entirely sufficient. All KRINNER ground screw drivers have been manufactured in-house. Therefore, Krinner is the only provider on the market that offers a complete system of products and installation technology to this extent.

Interested?

Interested?

Do you have a project that you think would benefit from KRINNER ground screws?


Want to find out more?

Want to find out more?

Would you like to get regular updates about foundation construction and ground screws?

More News

[Translate to en:]
News

Sustainability is the Key

With the Cubushome WOLF System GmbH thinks holistically, which is why sustainability starts with the foundation – it starts with a KRINNER ground…
News

The new KRINNER DIY assortment

With our new U-series and the new small G-series you get products in the usual high quality at affordable prices. We are replacing our complete U66-…
Tips from building contractors

Why is the soil a decisive factor in foundation construction?

Are you planning on constructing a building, carport or garage and are wondering why you need to get a soil survey performed? A soil survey can give…
Tips from the professionals

Which solutions are available for surface and deep foundations?

There are various options when it comes to designing structure foundations. A surface or deep foundation must be chosen depending on the composition…
Tips from the professionals

Five advantages of ground screws over concrete foundations

Whether you’re planning foundations for a terrace, a carport or an entire building, as a general rule concrete foundations are always considered as…
Load tests
Tips from the professionals

Where do ground screws get their stability from?

Ground screws are an innovative and concrete-free alternative for foundation construction. It’s a solution that is still relatively unknown and that…
Tips from the professionals

Which machines can be used to drive in ground screws?

Ground screws are an innovative and sustainable alternative to classic concrete foundations. The foundation construction process differs between the…
Tips from the professionals

Sustainable construction with ground screws

Climate change and the use of finite natural resources will not only be a big challenge over the next decades, but it is also an issue that will…

The cookies for displaying iframes were rejected. Please accept the iframe cookies to load the iframe.