TT-UKs customers are happy breaking new ground using the "jewel with the crown"

Mar 14, 2014

Since TT-UK launched the "new" GRUNDOMAT "N" soil displacement hammer in the UK, their customers have been giving positive feedback on the Grundomat N’s all round performance. In fact one customer has even had to break up arguments amongst their workforce as to who gets to use it on a daily basis.

First launched in 1970 and always a best seller the original GRUNDOMAT has progressed, transformed and evolved through various versions including the 'E', 'Z', 'P' and now the 'N'. The 'N' has not replaced or superseded the 'P' version as this is still available and continues to sell thousands of units a year.

So what is the difference between the 'P' and the 'N'?

Many customers are using both Grundomats with continued success, the 'N' version has all the normal features of the (moving head) 'P' version, but the 'N' version with the (reciprocating crown head) also has:

  • Crown head design for improved impact, ground handling and boring stability with higher penetration forces
  • Interchangeable options with multi cutter step cones (if required)
  • New thread design with locking wedge allows for easy assembly and disassembly (requires no heating or Loctite)
  • 2 forward gears for variable stroke frequency for better handling and soft start launch stability and increased accuracy
  • Improved seal provides economic air consumption

The GRUNDOMAT 'N' is self-propelled using compressed air and a two stroke impact method. Whilst in operation should an 'obstacle' be encountered and forward propulsion hindered, the crowned reciprocating head will continue chiselling independently; until the obstruction is fragmented and displaced. This design drives the percussive Grundomat mole fast and accurately through the ground, displacing and compacting the soil, whilst at the same time forming a bore hole through which pipes and cables can be pulled in simultaneously.

The GRUNDOMAT 'N' has a triple gear control stud, with the frequency and speed of the striking impact being chosen via two forward gears. This means that boring speeds can be altered to adapt to various soil conditions and provides smooth and constant propulsion; particularly useful at the start of the bore process and during alignment. With a simple quarter turn of the air hose, retrieval of the GRUNDOMAT 'N' is ensured, even when up against impenetrable soil conditions.

The Sizes range from 40 to 180mm diameter, with the length of the bore being relative to the diameter of the machine; the pipe/cable to be installed and prevailing soil conditions. The small diameter GRUNDOMAT 'Ns' perform well within the requirements for both commercial and domestic utility service connections and are used over a wide variety of applications; with bore lengths in excess of 30m. The range of larger GRUNDOMAT 'Ns' can install mains carrying pipes and cables, which includes the installation, replacement or repair & maintenance of Water, Gas and Sewer connections etc., as well as mini piling, and embankment tie rodding.

"R & D Water Engineers Ltd had been using the GRUNDOMAT 'P' for a number of years for some of our work laying water supply pipes. TT-UK sent us some literature last year for the new GRUNDOMAT 'N' and after a short trial, we have upgraded our machines and are now using GRUNDOMAT 'N' machines throughout the company.

I have been very pleased with the performance of the GRUNDOMAT 'N' on the whole. It goes through much harder ground than the 'P' machine did and more quickly. The second gear also makes a very positive difference to the speed with which the GRUNDOMAT mole goes through the ground. This reduces time and problems on site which is a cost benefit to the company. The new 'N' machines also need less time out for servicing as the servicing of the GRUNDOMAT 'N' is both quicker and easier.

All in all we are very pleased with the GRUNDOMAT 'N' and would be happy to recommend it as the best mole we have used".

Russel Jennings, Managing Director of R & D Water Engineers, Bideford, Devon

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Donna Constable

Windsor Road

MK42 9SU Bedford

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