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Impact moling with the new generation of GRUNDOMAT soil displacement hammers

The pneumatically driven hammers (“impact moles”) work according to the soil displacement method. When moving forward the spoil is displaced into the surrounding soil. That way 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 either be pulled in directly or later on. For operation, a compressor with 6–7 bar operating pressure is required.
For more than five decades, the GRUNDOMAT soil displacement hammers stand for on-target underground pipe installation and high quality impact moling. Their high target accuracy is due to the 2-stroke principle. With this proven concept, the piston initially strikes the chisel, which advances in order to produce the bore hole and to destroy any obstacles along the way. The casing is impacted with 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 impact moles work dead on target even in stony grounds. The optimised design of the new GRUNDOMAT generation convinces with new technical solutions that further improve durability and minimise time and service effort. The soil displacement hammer's broad range of applications is also retained, new options such as the servo control for small machine sizes simplify handling.

Special applications

  • Pipe ramming (from type 130 on)
  • Dynamic pipe renewal (from type 95 on)
  • Extraction of steel pipes
  • Pile foundations


 

Impact moling with GRUNDOMAT

What is impact moling?

Impact moling is an environmentally friendly, fast and cost-efficient method of trenchless construction. Using an impact mole (also known as soil displacement hammer or earth piercing tool), pipes and cables can be laid trenchless via the “soil displacement method”. The soil displacement hammer is driven with compressed air, thereby an underground cavity is created into which pipes can be drawn.
 

Impact moling – example application

You want to lay new pipes in your basement, e.g. due to a water pipe break? Or you want to install a charging station for your electric car in your garage? With the impact moling method this is possible without digging up and replanting the garden or damaging and re-paving the driveway in front of the garage.
 

Benefits of the impact moling method

  • Fast and efficient pipe laying and pipe renewal
  • Minimal surface damage
  • No / minimal impact on traffic or residents
  • More cost efficient than traditional trenching methods
 

Mole servicing and mole repairs

We at Tracto Techik have over 50 years of experience in the field of trenchless construction. We are happy to help you with mole serciving and repair.
With the right care and mole servicing you can increase the life span of your impact mole considerably. If your soil displacement hammer needs a short checkup, a major overhaul or or repair of a defect, we will help you with the quick and safe mole servicing and all necessary repairs.

What does our mole servicing include?

  • Collection and delivery of your impact mole
  • Opening and detailed checking
  • Maintenance of all components
  • Renewal of defective parts
  • Professional mounting of your impact mole
  • Creation of a status report

What are the advantages of our mole servicing?

  • Increase service life of the soil displacement hammer
  • Reliable and safe operation
  • No unexpected loss of work due to a defect impact mole

We can help you with the repairs and servicing of your moling equipment | Contact us!


GRUNDOMAT FLIES UNDER NOT OVER HANGAR 61 AT LONDON LUTON AIRPORT

The video shows a GRUNDOMAT 130 arriving exactly on target at a pre-determinded point as part of a tricky underground bore to lay a cable duct beneath the airport hangar apron at London Luton Airport. According to Steve Marijewycz, Managing Director of Directional Drilling Services UK Ltd based in Bedford "The GRUNDOMAT soil displacement hammer was the only mole available that would be able to penetrate and bore accurately through the existing engineering brick manhole". The duration of the 9 m long bore and direct installation of the cable duct was completed in just two hours to the satisfaction of the customer SDC Special Projects.

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