Use of Cookies
By continuing your visit on our website, you consent to the use of cookies.
Further information

We use cookies on different pages to make visits of our website attractive and enable use of certain functions. These are small text files stored on your computer. Most of the cookies we use are deleted again from your hard disk after the end of your browser session (so-called session cookies). Other cookies will remain on your computer and make it possible for us to recognise your computer again at your next visit (so-called permanent cookies). Our partner companies have no right to collect personal information via cookies through our website, to process or use them.


GRUNDOCORE - Core drill units

THE ROUND CONSTRUCTION PIT - The method of the future

There is increasing evidence that circular excavation pits are the conceptual solution for the trenchless installation and renewal of water, gas, power and data lines within the domain of property service connection techniques. In comparison to conventional square-cut excavation pits, the surface damage and consequential costs can almost be eliminated. The re-instatement surface work is performed in a much safer, more productive and cost effective way.

The GRUNDOCORE core drill works a cylindrical core bore into the surface layer to cut open the excavation pit, with diameters of the opening ranging from 650 mm for minimally invasive keyholes to 1,500 mm for circular walk-in excavation pits. The bored out core is removed and set aside to be replaced later, it is then fitted back into the hole accurately with a special mortar when the work is done. This technique minimises stress fractures as there are no corners, so disruption is minimised and the road surface is re-instated sustainably.

One crucial benefit of round excavation pits, when compared to conventional square pits, is the long-term resistance of the repaired surface after the work has been carried out, this is due to the round shape. Re-sealed square excavation pits suffer strong term stress from the traffic running over or the thermal strain. The corners of square-cut pits are subject to stress peaks, so consequently severe cracks appear. If the excavation pit is circular, the strain is distributed evenly so stress is up to four times less.

Strain distribution in a squarecut excavation pit.

Strain distribution in a round excavation pit.

Square-cut pit – consequential costs cannot be avoided.

Round pit – restored surface.
Creating a core bore.
650 mm (minimally invasive keyhole) to 1,500 mm
(round, walk-in construction pit).
Removing core, 
installation work or repairs.
Following completion of
installation work:
with special mortar.

GRUNDOCORE Core drill units - For a perfect construction pit

GRUNDOCORE 650/450 - The basic machine

GRUNDOCORE 650/600 - The power pack

GRUNDOCORE 650/600 TSC - The all-rounder

GRUNDOCORE 1500/650 - The changeable


Further information



Do you have any product or
services related questions?
Please contact us:

+44 (0)1234.342 566
Send E-Mail