Percussion Drilling
Drilling system in rotary and percussive motion

Ramming method

In the ram drilling method, the drilling system is drilled in a rotating and percussive motion. Also commonly referred to as "rotary percussive". It is one of various displacement methods, which is applied with the following equipment / fittings, depending on the initial situation:
  • lost pile driving tip
  • lost pile driving tip with bayonet (special design)
  • solid core bit
  • Eccentric drill bit
  • rotary drilling method, without mud
  • Rotary drilling method with flushing, preferably with air, water or suspension (cement)

Method of operation & field of application

Pile driving in foundation engineering is mainly used in loose sandy or clayey soil. Two drilling methods can be used: Either displacement drilling with or without flushing.

Zipp Industries GmbH & Co. KG recommends the method with flushing for an easier and more efficient drilling process.

Delivery programme & services

  • Drilling system
  • Features
  • Accessories

Percussion drilling with flushing

We do use drill pipes, which have a double sided inner thread or an inner and outer thread, or directly screwed together. The drilling process is carried out by using a rotary and slugging function by flushing at the same time. At the end of the pipe, there is either a driving shoe with a lost bit or a lost percussion bit with a flushing connection. One alternative is to use a percussion bit connected to a boring tube with flushing connections or a connected core drill.
  • The shank adaptor with a thread outlet connects the drill hammer with the flush wave. The impact energy of the drill hammer is directed on the flush wave, over the percussion bit on the boring tube - or alternatively, on the lost bit or the lost percussion bit, or on the fixed connected core bit or percussion bit.


  • The flushing medium air or water is directed over the flushing head into the boring tube and leaves through the flush drilling through the percussion bit or core bit. The borehole bottom is flushed and the flushing cuttings will be delivered to the surface by passing the annular gap (free space between boring tube and borehole wall).


  • The lost percussion bit or core bit is pushed off when withdrawing the boring tubes and stays in the drill hole. In contrast to this, the fixed drill bit (percussion bit or core bit) is pulled out the ground together with the boring tube.

Boring tube

The drill pipes are manufactured in our company from two components. The sockets and pins are made of quenched and tempered steel and can be surface-hardened on request. The pipe itself is made of structural steel and has a wall thickness of 10 mm as standard. The components are joined using the friction welding process in our friction welding facility and has proven to be highly resilient in practice.

The drill pipes are available in various lengths and diameters. Standard lengths:

  • NL 500 (socket / socket) | NL 1000 (socket / socket)
  • NL 500 | NL 1000 | NL 1500 | NL 2000 | NL 3000 | NL 4000

Flushing head

By the help of the flushing head, which is made of different components, the flushing medium – air or water – is lead into the drill string. This will ensure that the drilling cuttings are delivered through the annular gap up to the surface. By using a one-way flushing, another positive effect is the prevention of the penetration of sand and clay into the drill string.

The flushing heads are made of tempered steel, surface hardened. The technical drawing shows an example of it. We do offer a variety of flushing heads and we’ll be glad to provide any consulting regarding the specific requirements of your local conditions.

Lost bits

The lost bit is made of grey cast iron and is therefore cost-effective and highly resilient. It is mainly used for core drilling in very deep areas. The drill bit does not overheat in the process.

Zipp Industries GmbH & Co. KG has made good experiences with the diameters 88.9-152.4 mm from years of knowledge. The specified versions are available in left-hand and right-hand form. Versions:

  • Lost bit with spade edge
    wide carrier - with or without flushing connection - optional non-return valve
  • Lost bit with spade edge
    narrow carrier - with or without flushing connection - optional non-return valve
  • Lost bit with cross cutting edge
    wide carrier - with or without flushing connection

  • Lost bit with bayonet lock
    available with cross-type cutting or spade edge

Driving shoe

The driving shoe has the function to pick up the lost bit and to save the drill rods. The locking mechanism of the lost bit depends on the impact device used and on the fact, whether the customer intends to reuse the drill bit or not.

Would you like more information about our drilling tools? Get in touch with us!

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