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Impact Moling

Impact Moling is a way of digging where a pneumatic piercing tool is used to create a bore hole in the ground. This ensures that there is minimal disruption at the site.

Grundomat Impact Mole

The pneumatically driven impact moles work according to the soil displacement method. Unlike steerable horizontal boring machines, the non-steerable mole hammer compacts the spoil into the surrounding soil when moving forward. Thus a channel is produced, into which short pipes with smooth sockets, or long pipes made of plastic (PE, PVC or PE-X) up to OD 160 or cables are pulled in. Depending on the type of soil, lengths up to 25 m can be either pulled in directly or later on. For operation, a compressor with 6 – 7 bar operating pressure is required. That way, crossings underneath valuable surfaces and house service connections can be established with the mole hammers in a cost-effective and environmentally friendly manner.

The optimised design of the new GRUNDOMAT impact moles features new technical solutions, which further improve durability and minimise time and service effort for trenchless pipe installation. The variety of applications with the mole hammer is also retained and new options, such as servo- control for small machine sizes, simplify handling.

Working principle

The GRUNDOMAT soil displacement hammer’s high target accuracy is due to the 2-stroke principle. With this proven concept, the piston initially strikes the chisel, which advances forward in order to produce the bore hole and to destroy any obstacles along the way.

The casing is impacted in the second stroke and pulled in with the pipe attached. That way peak resistance and casing friction are separated and alternately easier to overcome. This makes the GRUNDOMAT mole hammer work dead on target even in stony grounds.


High penetrating power and reliable thrust

  • On-target pipe installation in 2-stroke principle thanks to movable head
  • With crowned or step head for pipe installation even in difficult soils
  • For house connections and undercrossings up to 25 m in length
  • Durable, low-maintenance technology ‘Made in Germany’
  • Flexible and versatile application range

Areas Covered

Moling Experts operate in the South of the UK and cover many areas. Our various services including impact moling, water pipe repairs, trenchless digging, and more are available in the areas below and their surrounding towns, cities and villages. If you do not see your area listed please do still contact us for a quote as we do often travel outside of these areas.
  • Hampshire
  • West Sussex
  • Surrey
  • Berkshire
  • South London
  • East London
  • West London
  • North London
  • Greater London
Moling Experts Areas Covered


Moling Experts have various certificates and awards that are industry related. We have displayed some of them here for your peace of mind. We want you to know that you are in safe hands.

Need a quote?

Please get in touch with us to discuss your problem. We can help you. Please let us have as much information as possible and we can come to your property to diagnose the problem and provide you with a no obligation quote. You can email or call using the contact details below or complete the quote form.

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