Ground screws

Our product range

The G-series ground screws are ideal for the quick, vertical and permanent installation of masts and fence posts. They come equipped with one, three or four threaded nuts for set screws. Optionally, the fence post, pole or mast, can also be quickly and permanently fixed into place with the special granulate.

The M-series ground screws have a centred M-thread which allows the object that is to be carried to be directly screwed onto the ground screw. They are particularly suitable for constructing prefabricated garages and containers, for example.

The U-series ground screws have been specially designed for all regularly-dimensioned timber beams. They are perfect for the simple and fast mounting of horizontal and vertical timber beams, for example during carport and wooden terrace construction.

Eco-friendly, efficient and safe

The advantages of Krinner ground screws

Eco-friendly

Eco-friendly

Our ground screws don’t harm the environment during installation or after use. No soil needs to be moved for the installation and the foundations can be removed without leaving behind any residue.

Efficient

Efficient

The installation process is significantly faster than that of traditional foundation solutions. Individual foundations can be created in just a few minutes and house foundations take just a day to be put in place.

Safe

Safe

Based on the thousand-year-old pile foundation principle, ground screws offer a safe and secure foundation solution. They can carry the same load as some conventional concrete foundations.

KNOW-HOW AND NEWS

The KRINNER blog

Tips from building contractors

Where do ground screws get their stability from?

Tips from building contractors

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 raises a lot of questions. Foundations without concrete? Are they actually stable and can they safely support a load-bearing structure? We will explain to you exactly how ground screws work and what factors the load-bearing capacity and therefore the safety of this foundation solution is dependent on. The principle behind it is just as simple as it is ingenious.

The principle of screws in the floor

Ground screws are a type of displacement pile and are therefore based on one of the oldest forms of foundation construction – pile foundations, which have been used for thousands of years. As opposed to earlier versions made from wood, ground screws are galvanised steel pipes with a welded-on thread which is designed to support horizontal and vertical loads in the floor and is installed with the help of a ground screw driver. Using this type of foundation rids you of the need to displace any earth when building.

In principle, the ground screws work in exactly the same way as a standard screw would in the wall with a wall plug or when driven into a piece of wood. When the screw is driven in with some force, an interlocking connection forms between the screw and the wood. In this case, interlocking means that the screw interlocks with the wood and is firmly fixed into place.  

If you drive a ground screw into the ground with sufficient clamping pressure, the interlocking happens in the same way. The welded thread helps the foundation to positively interlock with the ground. In addition, when the ground screw is driven in, the earth is displaced and compacted, causing an additional frictional connection between the ground and the shaft of the ground screw. Frictional connections are caused by frictional forces, which in this case is the surface friction between the steel pipe and the ground.

The ground does all the hard work

It’s clear that the ground is a crucial factor with regards to the load-bearing capacity of the ground screws. The interaction between the screws and the subsoil is what makes the ground screws work as foundations. As such, the ground defines the outer load-bearing capacity of the foundations, and the screw the inner load-bearing capacity.

A soil survey is essential in order to evaluate the outer load-bearing capacity of the foundations. This survey can also provide insight into what different soil types there are on the construction site, what the consistency of the soil is like and where the load-bearing layers are located. Not all floors are equally suitable for carrying loads, there are many different factors that have an influence here. These can include the composition of individual soil elements, the density of the bedding and any possible groundwater movements. With this information, the data about the load to be placed on the foundations and the performance data for the ground screws, the foundation layout can be calculated and planned. Load-bearing tests also give an insight into the actual load-bearing capacity of the construction site. A load-bearing test must be carried out to provide proof that the construction site is suitable before any project planning can begin.

Professional installation is important

Another important factor with regards to the load-bearing capacity of the foundation lies in the technology used for the installation. There is a wide variety of machines available to aid with the installation. They range from electric ground screw drivers, to hydraulic excavator add-ons, to self-driving caterpillars with drilling attachments. Regardless of the machine type, they all have one thing in common: they must be operated by an experienced and professional machine operator.

As when it comes to the correct driving in of the ground screws there are many different things that must be taken into consideration. For example, care must be taken to ensure that the screws are evenly driven in with sufficient clamping pressure. You also need to keep an eye on the torque and the level to ensure a perpendicular installation of the ground screws. Any tilting or imprecision in the installation can have a negative impact on the load-bearing capacity, as can an upward movement of the soil. Still, it’s relatively easy to learn how to install ground screws and, if you follow the manufacturers installation recommendations, easy to do.

Summary

With ground screws, it’s the same as with any other type of foundation. The right products, suitable soil and installation expertise must all be brought together to create a safe and secure foundation. Ground screws are not only incredibly safe, but they are also an innovative and soil-friendly alternative to other traditional types of foundation. This means that they can be used for a wide range of different applications, from road signs and advertising displays, to terraces, carports and residential buildings. For this, KRINNER manufactures a large range of ground screws and suitable ground screw drivers for any installation requirement.

Areas of application

A stable foundation for all types of buildings

Grounds screws are a great all-around solution for both surface and deep foundations, and are often an economic solution for various structural issues. You can use them for a variety of different applications, like for sustainable construction projects or in road and traffic engineering.

Specialist retailers and installers

Find an expert near you!

Do you have a project that our ground screws would be ideal for? Here you can find a list of specialist retailers and installers that can help you with the realisation of your project.

Free newsletter

Do you want to stay up to date?

Free newsletter

Do you want to stay up to date?

Do you want to know what's going on in the world of ground screws? With our newsletter, we regularly inform you about new projects, products and all other news about KRINNER and the world of ground screws.

Careers

Challenging tasks and considerable scope for action

Careers

Challenging tasks and considerable scope for action

We are looking for dedicated and motivated people who will help us to drive forward our company in an exciting and innovative industry. We place great value on personal initiative, responsibility and personal development. You can expect a welcoming working environment that offers all the amenities of a modern employer. This includes flexible working hours, options for continuous further development and exciting career opportunities. Interested?

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