Frequently Asked Questions

Who is Krinner

Krinner Schraubfundamente GmbH is a German based company founded by Klaus Krinner, who invented and patented the ground screw in 1994.  Krinner Australia was founded in 2006.

What are ground screws?

Ground screws are an alternative structural foundation for construction. Ground screws can be compared to traditional helical screw piles, however instead of one single helix or blade, ground screws feature a continuous welded thread. You can think of a ground screw like a giant self-drilling timber screw.. during installation they compact the soil around them, forming a tight bond and achieving great stability.

Do Krinner Ground Screws comply with Australian/NZ standards?

Krinner ground screws comply with the relevant European standards DIN EN. Constructed from S235 steel (flange in S355 where applicable), continuos welded spiral and hot dip galvanized DIN EN ISO 1461

How do I select a ground screw size/type?

Ground screw type will depend on usage and how you want to connect to the ground screw i.e bolting to a flange, post inserted into open neck, U-stirrup etc. The size required will depend on the design loads of the structure and the bearing capacity of the soil on site. The performance of a ground screw is largely determined by the soil conditions into which it is installed (which is why we always prefer to see a soil test).

Can ground screws be installed into rocky soil or rock?

Yes, ground screws can be installed into any type of soil including rocky soil and even solid rock, with the help of pre-drilling equipment. We have developed a wide range of purpose-built installation equipment and machinery including auger pre-drilling and DTH hammer drilling equipment to allow for installation into all soil types and rock.

How long do ground screws last?

Being manufactured in S235 steel, the lifespan is limited and will depend on the aggressiveness of the soil to determine lifespan. A soil test with laboratory report is recommended. 

Are ground screws suitable for residential and large-scale construction?

Ground screws are capable of supporting large loads, especially in good soil conditions. Our engineer has various methods of maximising ground screw capacities for large loads i.e bridge supports. Our ground screws have been used by a number of Australian Government agencies, Council’s across Australia and some of Australia’s largest construction companies and mines. They are often used as footings for residential construction, underpinning for residential and commercial construction and cyclone tie downs for mining camps and other structures in cyclonic regions.