GRUNDOMAT soil displacement technique

The pneumatically driven hammers work according to the soil displacement method: when moving forward the spoil is displaced into the surrounding soil. A channel is produced into which plastic (PE, PVC or PE-X), socketless short- or long- pipes up to OD160 or cables can be pulled through. Depending on the type of soil, lengths of up to 25m can either be pulled in simultaneously or later. A compressor with 6 – 7 bar operating pressure is required for this, with exact alignment of the machine towards the target necessary for high accuracy. 

The 2-Stroke Principle

With the proven 2-stroke principle, the precise target accuracy as well as the exact alignments and adjustments are achieved through the 2-stroke impact method.

On the first stroke, the whole moving head assembly is propelled forward as the piston accelerates and impacts against the rear of the chisel driving it forward to create a pilot bore hole. As the piston then returns in the second stroke, the compressed spring in the head further pulls the long cylindrical casing into the previously made pilot bore hole.

Should an obstacle be encountered and forward propulsion hindered, the chisel or crowned head in the reciprocating head will continue chiselling independently until the obstruction is fragmented and displaced.

This makes the GRUNDOMAT achieve on- target results even in stony grounds.

Applications & Advantages

UNDER CROSSINGS
Road crossings and property service connections are everyday tasks for the GRUNDOMAT.

PIPE RAMMING FROM MODEL 130
GRUNDOMAT can also be used for ramming in steel pipes by attaching a special ram cone to the head of the machine.

PIPE BURSTING FROM MODEL 95
Modified soil displacement hammers are also applicable for pipe renewal using the pipe bursting method.

PILING
GRUNDOMATs are also ideal for vertical use such as piling for laying foundations.

PROPERTY SERVICE CONNECTIONS – DIRECTLY FROM INSIDE THE BUILDING
When house connections for gas, water, sewage, electricity, broadband cabling and fibre can start directly from the property a start trench outside the property wall is no longer necessary. This makes the use even more efficient, and the front garden is spared.