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.