Sysbohr design and manufacture first class drilling systems, tools and accessories for the construction and geothermal industries. All products are manufactured in Fulda by Sysbohr and are distributed worldwide through an excellent distribution network. In-house specialists and consultants ensure that the requirements of the customer are fully met. Flexibility within the design and manufacture of products is one of the most important features.

Overburden Drilling Systems

The name “Overburden Drilling” results from the composition of the earth‘s crust. The bedrock is covered with loose layers of earth consisting of sand, gravel, boulders combined with loose ground and other deposits. All these formations are grouped together under the umbrella term “Overburden”, which overlies the bedrock.

Certain drilling processes make it necessary to support a borehole wall with tubes. Based on the requirements and circumstances at hand, different drilling variants can be used, pure rotary drilling with a rotary head or rotary percussion with a hydraulic drifter or with a double head drilling unit rotary / rotary or rotary / rotary / rotary-percussion. Please see below the different variants in detail.

D 114.3 – D 244.5 with rotary head

The name “Overburden Drilling” results from the composition of the earth crust. The bedrock is covered with loose layers of earth consisting of sand, gravel, boulders combined with loose ground and other deposits. All these formations are grouped together under the umbrella term “Overburden”, which overlies the bedrock.
Certain drilling processes make it necessary to support the wall with tubes. The system shown here has two rotary units that can rotate opposite to each other. The rods counter-rotate independently. Air or water is flushed down the center of the inner drill string to the end of the drill hole. It discharges the cuttings in the annuls between both rods through the flushing holes above. The slide of the rotary drives allows the inner rod to move ahead the outer rod and can even be pulled back. The pilot effect of the inner rod gives better alignment. So, these systems are especially suitable for horizontal drilling, e.g. injection drilling for tunneling and exploratory drilling.

Depending on the ground conditions, the drilling can be made either with rotary drill bits or DTH-hammers. Another possible way to discharge the cuttings is to use auger drill rods, especially, if flushing with air or water is not possible with this system to drill the whole drill string in together, the drilling is made separately. First the outer casing, followed by the inner string.

Head-DTHhammer
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Overburden-Drilling-1

D 88.9 – D 152.4 with hydraulic drifter

The name “Overburden Drilling” results from the composition of the earth crust. The bedrock is covered with loose layers of earth consisting of sand, gravel, boulders combined with loose ground and other deposits. All these formations are grouped together under the umbrella term “Overburden”, which overlies the bedrock.
Certain drilling processes make it necessary to support the wall with tubes. The system shown here is powered by a hydraulic hammer, which turns and strikes the whole drill string from above, consisting of an outer and inner rod. Air or water is flushed down the center of the inner drill string to the end of the drill hole. It discharges the cuttings in the ring space between both rods through the flushing holes above. This drilling system is used for relatively shallow depths.

Head-DTHhammer
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AugerDrilling-2
Overburden-Drilling-2

D 114.3-D 219.1 with double head drilling unit (rotary/rotary)

The name „Overburden Drilling” results from the composition of the earth crust. The bedrock is covered with loose layers of earth consisting of sand, gravel, boulders combined with loose soil and other deposits. All these formations are grouped together under the umbrella term „Overburden”, which overlies the bedrock.

Certain drilling processes make it necessary to support the wall with tubes. The system shown here has two rotation units which can be moved opposite to one another. The rods are counter-rotating independently. Air or water is flushed down the center of the inner drill string to the end of the drill hole. It discharges the boring in the ring space between both rods through the flushing holes above. The slide of the rotary drives allows the inner rod to move up and down relative to the outer casing. The pilot effect of the inner rod gives better alignment. So, these systems are especially suitable for horizontal drilling, e.g. injection drilling for tunneling and exploratory drilling.
Depending on the ground conditions, the drilling is made either with rotary drill bits or DTH-hammers. Another possible way to discharge the boring is to use auger drill rods, which are especially suitable for deep drilling with eccentric drill bits. This system is also convenient, if flushing with air or water is not allowed for construction or environmental reasons.

head-DTHhammer-1
Head-DTHhammer
AugerDrilling-2
Overburden-drilling-3

 D 114.3 – D 177.8 with double head drilling unit (rotary/rotary-percussion)

The name „Overburden Drilling” results from the composition of the earth crust. The bedrock is covered with loose layers of earth consisting of sand, gravel, boulders combined with loose soil and other deposits. All these formations are grouped together under the umbrella term „Overburden”, which overlies the bedrock.

Certain drilling processes make it necessary to support the wall with tubes. The system shown here has two heads which can be moved opposite to one another, rotary (outer rods) and rotary-percussion (inner rod). The rods are counter-rotating independently. Air or water can be flushed down the center of the inner drill string to the end of the drill hole. It discharges the cuttings in the annulus between both rods through the flushing holes above. The slide of the rotary drives allows the inner rod to move up and down relative to the outer casing. The pilot effect of the inner rod gives better alignment. So, these systems are especially suitable for horizontal drilling, e.g. injection drilling for tunneling and exploratory drilling.

head-DTHhammer-1
Head-DTHhammer
Overburden-drilling-4