Hammer boring with a steel pipe

Hammer boring is an effective and reliable drilling method for installing steel pipes in hard soil. The pneumatic hammer is placed inside the steel tube after the crown tip of the drill. The drill press pushes and rotates the drill bit into the ground, and the pneumatically operated hammer at the tip hammers dense soil, stones and rock into smaller material.

The impact force of the hammer is transmitted to the crown tip and to the end of the steel pipe to be installed. The impacting hammer head pushes the pipe in the drilled hole. The transfer screws located inside the pipe empty the pipe of soil and transport the soil to the drilling trench.

Pietari Viitanen
+358 50 586 4081
pietari.viitanen@nordbos.com

Hammer boring 406mm – 1220mm

Our hammer drill HZR1200 enables the drilling of steel pipes with the following diameters:

• 406mm
• 508mm
• 610mm
• 815mm
• 1016mm
• 1220mm

Hammer boring 168mm – 508mm

Our hammer drill HZR400 enables the drilling of steel pipes with the following diameters:

• 168mm
• 219mm
• 323mm
• 406mm
• 508mm

Hammer boring with guided technology into the rock

With the guided hammer boring technique, you can make a precise and directed drill hole to the desired pitch and length. The requirement for the use of the technology is that the drilling is carried out in clean bedrock, so a steel pipe is not needed to keep the borehole open. Boring is started with a 165mm controlled drilling system, after which the drill hole is reamed to the desired diameter. It is possible to widen the drill hole up to 1220 mm. When the desired hole size has been achieved with the help of reaming, it is easy to slide e.g. a sewer pipe etc. into the hole.

Pietari Viitanen
+358 50 586 4081
pietari.viitanen@nordbos.com

Our equipment enables hammer boring with guided technology into the rock for the following diameters:

165mm – 1220mm

Steel pipe ramming in soft ground

Ramming technique is a very useful method of no-dig technology, in which an open steel casing or steel pipe is driven through the ground, using a ram based on a jackhammer, behind the piece to be rammed.

The ram is planted behind the piece to be rammed with suitable jaws, after which the movement of the hammer knocks the piece to be rammed into the ground to the desired length, at the desired and pre-determined slope. With the technology, it is possible to install the desired piece horizontally, at the desired angle or in some cases even vertically. The soil material goes inside the pipe, and when the desired length has been reached, the soil material is cleaned from the inside of the pipe, e.g. using a flushing car.

The steel pieces are joined together by welding until the desired length is reached. The length of the pipe to be jointed depends on the soil and the diameter of the pipe, according to which the size of the joint is selected. Depending on the diameter and length of the pipes to be rammed, a suitable ram is selected for the job.

The ramming technique is an excellent technique in a place where the soil is easily collapsible, the vibration caused by the ram is small, so the risk of collapse is minimal.

The technique is usable in areas where, by using some other underlayment technique, there is a risk that the pipe or other equipment will sink due to the softness of the soil.

In relation to the soil, the ramming technique is at its best in soft, loose and low-stone soils. For example, soft clay, other organic soft soil, silt, loose and hard sand are optimal applications for this technique.

In larger pipe sizes (over 800mm) it is possible to break individual earth stones from inside the pipe, but the technique is not recommended for very rocky terrain.

Pietari Viitanen
+358 50 586 4081
pietari.viitanen@nordbos.com

The lengths of the pipes to be rammed: up to 80 m

The diameters of the pipes to be rammed: 50 mm – 4000 mm